| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Jakub Kiciński | 16846 | 88.88% | 164 | 77.73% |
| Yinjun Zhang | 659 | 3.48% | 1 | 0.47% |
| Dirk van der Merwe | 415 | 2.19% | 4 | 1.90% |
| Pablo Cascón | 410 | 2.16% | 4 | 1.90% |
| Simon Horman | 188 | 0.99% | 1 | 0.47% |
| Edwin Peer | 103 | 0.54% | 3 | 1.42% |
| Daniel Borkmann | 92 | 0.49% | 3 | 1.42% |
| Jesper Dangaard Brouer | 71 | 0.37% | 2 | 0.95% |
| John Hurley | 53 | 0.28% | 3 | 1.42% |
| Florian Fainelli | 22 | 0.12% | 2 | 0.95% |
| Lorenzo Bianconi | 18 | 0.09% | 2 | 0.95% |
| Kees Cook | 14 | 0.07% | 1 | 0.47% |
| Allen Pais | 13 | 0.07% | 1 | 0.47% |
| Björn Töpel | 8 | 0.04% | 1 | 0.47% |
| Michael S. Tsirkin | 6 | 0.03% | 2 | 0.95% |
| Nikita V. Shirokov | 5 | 0.03% | 1 | 0.47% |
| Jiri Pirko | 5 | 0.03% | 2 | 0.95% |
| Gustavo A. R. Silva | 4 | 0.02% | 1 | 0.47% |
| Matthew Wilcox | 3 | 0.02% | 1 | 0.47% |
| Florian Westphal | 2 | 0.01% | 1 | 0.47% |
| David S. Miller | 2 | 0.01% | 1 | 0.47% |
| Tom Herbert | 2 | 0.01% | 1 | 0.47% |
| jun qian | 2 | 0.01% | 1 | 0.47% |
| Quentin Monnet | 2 | 0.01% | 1 | 0.47% |
| Jarod Wilson | 2 | 0.01% | 1 | 0.47% |
| Luis R. Rodriguez | 2 | 0.01% | 1 | 0.47% |
| Colin Ian King | 1 | 0.01% | 1 | 0.47% |
| Pieter Jansen van Vuuren | 1 | 0.01% | 1 | 0.47% |
| Luc Van Oostenryck | 1 | 0.01% | 1 | 0.47% |
| Niklas Söderlund | 1 | 0.01% | 1 | 0.47% |
| Stephen Hemminger | 1 | 0.01% | 1 | 0.47% |
| Total | 18954 | 211 |
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) /* Copyright (C) 2015-2018 Netronome Systems, Inc. */ /* * nfp_net_common.c * Netronome network device driver: Common functions between PF and VF * Authors: Jakub Kicinski <jakub.kicinski@netronome.com> * Jason McMullan <jason.mcmullan@netronome.com> * Rolf Neugebauer <rolf.neugebauer@netronome.com> * Brad Petrus <brad.petrus@netronome.com> * Chris Telfer <chris.telfer@netronome.com> */ #include <linux/bitfield.h> #include <linux/bpf.h> #include <linux/bpf_trace.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/fs.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/interrupt.h> #include <linux/ip.h> #include <linux/ipv6.h> #include <linux/mm.h> #include <linux/overflow.h> #include <linux/page_ref.h> #include <linux/pci.h> #include <linux/pci_regs.h> #include <linux/msi.h> #include <linux/ethtool.h> #include <linux/log2.h> #include <linux/if_vlan.h> #include <linux/random.h> #include <linux/vmalloc.h> #include <linux/ktime.h> #include <net/tls.h> #include <net/vxlan.h> #include "nfpcore/nfp_nsp.h" #include "ccm.h" #include "nfp_app.h" #include "nfp_net_ctrl.h" #include "nfp_net.h" #include "nfp_net_sriov.h" #include "nfp_port.h" #include "crypto/crypto.h" #include "crypto/fw.h" /** * nfp_net_get_fw_version() - Read and parse the FW version * @fw_ver: Output fw_version structure to read to * @ctrl_bar: Mapped address of the control BAR */ void nfp_net_get_fw_version(struct nfp_net_fw_version *fw_ver, void __iomem *ctrl_bar) { u32 reg; reg = readl(ctrl_bar + NFP_NET_CFG_VERSION); put_unaligned_le32(reg, fw_ver); } static dma_addr_t nfp_net_dma_map_rx(struct nfp_net_dp *dp, void *frag) { return dma_map_single_attrs(dp->dev, frag + NFP_NET_RX_BUF_HEADROOM, dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA, dp->rx_dma_dir, DMA_ATTR_SKIP_CPU_SYNC); } static void nfp_net_dma_sync_dev_rx(const struct nfp_net_dp *dp, dma_addr_t dma_addr) { dma_sync_single_for_device(dp->dev, dma_addr, dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA, dp->rx_dma_dir); } static void nfp_net_dma_unmap_rx(struct nfp_net_dp *dp, dma_addr_t dma_addr) { dma_unmap_single_attrs(dp->dev, dma_addr, dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA, dp->rx_dma_dir, DMA_ATTR_SKIP_CPU_SYNC); } static void nfp_net_dma_sync_cpu_rx(struct nfp_net_dp *dp, dma_addr_t dma_addr, unsigned int len) { dma_sync_single_for_cpu(dp->dev, dma_addr - NFP_NET_RX_BUF_HEADROOM, len, dp->rx_dma_dir); } /* Firmware reconfig * * Firmware reconfig may take a while so we have two versions of it - * synchronous and asynchronous (posted). All synchronous callers are holding * RTNL so we don't have to worry about serializing them. */ static void nfp_net_reconfig_start(struct nfp_net *nn, u32 update) { nn_writel(nn, NFP_NET_CFG_UPDATE, update); /* ensure update is written before pinging HW */ nn_pci_flush(nn); nfp_qcp_wr_ptr_add(nn->qcp_cfg, 1); nn->reconfig_in_progress_update = update; } /* Pass 0 as update to run posted reconfigs. */ static void nfp_net_reconfig_start_async(struct nfp_net *nn, u32 update) { update |= nn->reconfig_posted; nn->reconfig_posted = 0; nfp_net_reconfig_start(nn, update); nn->reconfig_timer_active = true; mod_timer(&nn->reconfig_timer, jiffies + NFP_NET_POLL_TIMEOUT * HZ); } static bool nfp_net_reconfig_check_done(struct nfp_net *nn, bool last_check) { u32 reg; reg = nn_readl(nn, NFP_NET_CFG_UPDATE); if (reg == 0) return true; if (reg & NFP_NET_CFG_UPDATE_ERR) { nn_err(nn, "Reconfig error (status: 0x%08x update: 0x%08x ctrl: 0x%08x)\n", reg, nn->reconfig_in_progress_update, nn_readl(nn, NFP_NET_CFG_CTRL)); return true; } else if (last_check) { nn_err(nn, "Reconfig timeout (status: 0x%08x update: 0x%08x ctrl: 0x%08x)\n", reg, nn->reconfig_in_progress_update, nn_readl(nn, NFP_NET_CFG_CTRL)); return true; } return false; } static bool __nfp_net_reconfig_wait(struct nfp_net *nn, unsigned long deadline) { bool timed_out = false; int i; /* Poll update field, waiting for NFP to ack the config. * Do an opportunistic wait-busy loop, afterward sleep. */ for (i = 0; i < 50; i++) { if (nfp_net_reconfig_check_done(nn, false)) return false; udelay(4); } while (!nfp_net_reconfig_check_done(nn, timed_out)) { usleep_range(250, 500); timed_out = time_is_before_eq_jiffies(deadline); } return timed_out; } static int nfp_net_reconfig_wait(struct nfp_net *nn, unsigned long deadline) { if (__nfp_net_reconfig_wait(nn, deadline)) return -EIO; if (nn_readl(nn, NFP_NET_CFG_UPDATE) & NFP_NET_CFG_UPDATE_ERR) return -EIO; return 0; } static void nfp_net_reconfig_timer(struct timer_list *t) { struct nfp_net *nn = from_timer(nn, t, reconfig_timer); spin_lock_bh(&nn->reconfig_lock); nn->reconfig_timer_active = false; /* If sync caller is present it will take over from us */ if (nn->reconfig_sync_present) goto done; /* Read reconfig status and report errors */ nfp_net_reconfig_check_done(nn, true); if (nn->reconfig_posted) nfp_net_reconfig_start_async(nn, 0); done: spin_unlock_bh(&nn->reconfig_lock); } /** * nfp_net_reconfig_post() - Post async reconfig request * @nn: NFP Net device to reconfigure * @update: The value for the update field in the BAR config * * Record FW reconfiguration request. Reconfiguration will be kicked off * whenever reconfiguration machinery is idle. Multiple requests can be * merged together! */ static void nfp_net_reconfig_post(struct nfp_net *nn, u32 update) { spin_lock_bh(&nn->reconfig_lock); /* Sync caller will kick off async reconf when it's done, just post */ if (nn->reconfig_sync_present) { nn->reconfig_posted |= update; goto done; } /* Opportunistically check if the previous command is done */ if (!nn->reconfig_timer_active || nfp_net_reconfig_check_done(nn, false)) nfp_net_reconfig_start_async(nn, update); else nn->reconfig_posted |= update; done: spin_unlock_bh(&nn->reconfig_lock); } static void nfp_net_reconfig_sync_enter(struct nfp_net *nn) { bool cancelled_timer = false; u32 pre_posted_requests; spin_lock_bh(&nn->reconfig_lock); WARN_ON(nn->reconfig_sync_present); nn->reconfig_sync_present = true; if (nn->reconfig_timer_active) { nn->reconfig_timer_active = false; cancelled_timer = true; } pre_posted_requests = nn->reconfig_posted; nn->reconfig_posted = 0; spin_unlock_bh(&nn->reconfig_lock); if (cancelled_timer) { del_timer_sync(&nn->reconfig_timer); nfp_net_reconfig_wait(nn, nn->reconfig_timer.expires); } /* Run the posted reconfigs which were issued before we started */ if (pre_posted_requests) { nfp_net_reconfig_start(nn, pre_posted_requests); nfp_net_reconfig_wait(nn, jiffies + HZ * NFP_NET_POLL_TIMEOUT); } } static void nfp_net_reconfig_wait_posted(struct nfp_net *nn) { nfp_net_reconfig_sync_enter(nn); spin_lock_bh(&nn->reconfig_lock); nn->reconfig_sync_present = false; spin_unlock_bh(&nn->reconfig_lock); } /** * __nfp_net_reconfig() - Reconfigure the firmware * @nn: NFP Net device to reconfigure * @update: The value for the update field in the BAR config * * Write the update word to the BAR and ping the reconfig queue. The * poll until the firmware has acknowledged the update by zeroing the * update word. * * Return: Negative errno on error, 0 on success */ int __nfp_net_reconfig(struct nfp_net *nn, u32 update) { int ret; nfp_net_reconfig_sync_enter(nn); nfp_net_reconfig_start(nn, update); ret = nfp_net_reconfig_wait(nn, jiffies + HZ * NFP_NET_POLL_TIMEOUT); spin_lock_bh(&nn->reconfig_lock); if (nn->reconfig_posted) nfp_net_reconfig_start_async(nn, 0); nn->reconfig_sync_present = false; spin_unlock_bh(&nn->reconfig_lock); return ret; } int nfp_net_reconfig(struct nfp_net *nn, u32 update) { int ret; nn_ctrl_bar_lock(nn); ret = __nfp_net_reconfig(nn, update); nn_ctrl_bar_unlock(nn); return ret; } int nfp_net_mbox_lock(struct nfp_net *nn, unsigned int data_size) { if (nn->tlv_caps.mbox_len < NFP_NET_CFG_MBOX_SIMPLE_VAL + data_size) { nn_err(nn, "mailbox too small for %u of data (%u)\n", data_size, nn->tlv_caps.mbox_len); return -EIO; } nn_ctrl_bar_lock(nn); return 0; } /** * nfp_net_mbox_reconfig() - Reconfigure the firmware via the mailbox * @nn: NFP Net device to reconfigure * @mbox_cmd: The value for the mailbox command * * Helper function for mailbox updates * * Return: Negative errno on error, 0 on success */ int nfp_net_mbox_reconfig(struct nfp_net *nn, u32 mbox_cmd) { u32 mbox = nn->tlv_caps.mbox_off; int ret; nn_writeq(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_CMD, mbox_cmd); ret = __nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_MBOX); if (ret) { nn_err(nn, "Mailbox update error\n"); return ret; } return -nn_readl(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_RET); } void nfp_net_mbox_reconfig_post(struct nfp_net *nn, u32 mbox_cmd) { u32 mbox = nn->tlv_caps.mbox_off; nn_writeq(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_CMD, mbox_cmd); nfp_net_reconfig_post(nn, NFP_NET_CFG_UPDATE_MBOX); } int nfp_net_mbox_reconfig_wait_posted(struct nfp_net *nn) { u32 mbox = nn->tlv_caps.mbox_off; nfp_net_reconfig_wait_posted(nn); return -nn_readl(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_RET); } int nfp_net_mbox_reconfig_and_unlock(struct nfp_net *nn, u32 mbox_cmd) { int ret; ret = nfp_net_mbox_reconfig(nn, mbox_cmd); nn_ctrl_bar_unlock(nn); return ret; } /* Interrupt configuration and handling */ /** * nfp_net_irq_unmask() - Unmask automasked interrupt * @nn: NFP Network structure * @entry_nr: MSI-X table entry * * Clear the ICR for the IRQ entry. */ static void nfp_net_irq_unmask(struct nfp_net *nn, unsigned int entry_nr) { nn_writeb(nn, NFP_NET_CFG_ICR(entry_nr), NFP_NET_CFG_ICR_UNMASKED); nn_pci_flush(nn); } /** * nfp_net_irqs_alloc() - allocates MSI-X irqs * @pdev: PCI device structure * @irq_entries: Array to be initialized and used to hold the irq entries * @min_irqs: Minimal acceptable number of interrupts * @wanted_irqs: Target number of interrupts to allocate * * Return: Number of irqs obtained or 0 on error. */ unsigned int nfp_net_irqs_alloc(struct pci_dev *pdev, struct msix_entry *irq_entries, unsigned int min_irqs, unsigned int wanted_irqs) { unsigned int i; int got_irqs; for (i = 0; i < wanted_irqs; i++) irq_entries[i].entry = i; got_irqs = pci_enable_msix_range(pdev, irq_entries, min_irqs, wanted_irqs); if (got_irqs < 0) { dev_err(&pdev->dev, "Failed to enable %d-%d MSI-X (err=%d)\n", min_irqs, wanted_irqs, got_irqs); return 0; } if (got_irqs < wanted_irqs) dev_warn(&pdev->dev, "Unable to allocate %d IRQs got only %d\n", wanted_irqs, got_irqs); return got_irqs; } /** * nfp_net_irqs_assign() - Assign interrupts allocated externally to netdev * @nn: NFP Network structure * @irq_entries: Table of allocated interrupts * @n: Size of @irq_entries (number of entries to grab) * * After interrupts are allocated with nfp_net_irqs_alloc() this function * should be called to assign them to a specific netdev (port). */ void nfp_net_irqs_assign(struct nfp_net *nn, struct msix_entry *irq_entries, unsigned int n) { struct nfp_net_dp *dp = &nn->dp; nn->max_r_vecs = n - NFP_NET_NON_Q_VECTORS; dp->num_r_vecs = nn->max_r_vecs; memcpy(nn->irq_entries, irq_entries, sizeof(*irq_entries) * n); if (dp->num_rx_rings > dp->num_r_vecs || dp->num_tx_rings > dp->num_r_vecs) dev_warn(nn->dp.dev, "More rings (%d,%d) than vectors (%d).\n", dp->num_rx_rings, dp->num_tx_rings, dp->num_r_vecs); dp->num_rx_rings = min(dp->num_r_vecs, dp->num_rx_rings); dp->num_tx_rings = min(dp->num_r_vecs, dp->num_tx_rings); dp->num_stack_tx_rings = dp->num_tx_rings; } /** * nfp_net_irqs_disable() - Disable interrupts * @pdev: PCI device structure * * Undoes what @nfp_net_irqs_alloc() does. */ void nfp_net_irqs_disable(struct pci_dev *pdev) { pci_disable_msix(pdev); } /** * nfp_net_irq_rxtx() - Interrupt service routine for RX/TX rings. * @irq: Interrupt * @data: Opaque data structure * * Return: Indicate if the interrupt has been handled. */ static irqreturn_t nfp_net_irq_rxtx(int irq, void *data) { struct nfp_net_r_vector *r_vec = data; /* Currently we cannot tell if it's a rx or tx interrupt, * since dim does not need accurate event_ctr to calculate, * we just use this counter for both rx and tx dim. */ r_vec->event_ctr++; napi_schedule_irqoff(&r_vec->napi); /* The FW auto-masks any interrupt, either via the MASK bit in * the MSI-X table or via the per entry ICR field. So there * is no need to disable interrupts here. */ return IRQ_HANDLED; } static irqreturn_t nfp_ctrl_irq_rxtx(int irq, void *data) { struct nfp_net_r_vector *r_vec = data; tasklet_schedule(&r_vec->tasklet); return IRQ_HANDLED; } /** * nfp_net_read_link_status() - Reread link status from control BAR * @nn: NFP Network structure */ static void nfp_net_read_link_status(struct nfp_net *nn) { unsigned long flags; bool link_up; u32 sts; spin_lock_irqsave(&nn->link_status_lock, flags); sts = nn_readl(nn, NFP_NET_CFG_STS); link_up = !!(sts & NFP_NET_CFG_STS_LINK); if (nn->link_up == link_up) goto out; nn->link_up = link_up; if (nn->port) set_bit(NFP_PORT_CHANGED, &nn->port->flags); if (nn->link_up) { netif_carrier_on(nn->dp.netdev); netdev_info(nn->dp.netdev, "NIC Link is Up\n"); } else { netif_carrier_off(nn->dp.netdev); netdev_info(nn->dp.netdev, "NIC Link is Down\n"); } out: spin_unlock_irqrestore(&nn->link_status_lock, flags); } /** * nfp_net_irq_lsc() - Interrupt service routine for link state changes * @irq: Interrupt * @data: Opaque data structure * * Return: Indicate if the interrupt has been handled. */ static irqreturn_t nfp_net_irq_lsc(int irq, void *data) { struct nfp_net *nn = data; struct msix_entry *entry; entry = &nn->irq_entries[NFP_NET_IRQ_LSC_IDX]; nfp_net_read_link_status(nn); nfp_net_irq_unmask(nn, entry->entry); return IRQ_HANDLED; } /** * nfp_net_irq_exn() - Interrupt service routine for exceptions * @irq: Interrupt * @data: Opaque data structure * * Return: Indicate if the interrupt has been handled. */ static irqreturn_t nfp_net_irq_exn(int irq, void *data) { struct nfp_net *nn = data; nn_err(nn, "%s: UNIMPLEMENTED.\n", __func__); /* XXX TO BE IMPLEMENTED */ return IRQ_HANDLED; } /** * nfp_net_tx_ring_init() - Fill in the boilerplate for a TX ring * @tx_ring: TX ring structure * @r_vec: IRQ vector servicing this ring * @idx: Ring index * @is_xdp: Is this an XDP TX ring? */ static void nfp_net_tx_ring_init(struct nfp_net_tx_ring *tx_ring, struct nfp_net_r_vector *r_vec, unsigned int idx, bool is_xdp) { struct nfp_net *nn = r_vec->nfp_net; tx_ring->idx = idx; tx_ring->r_vec = r_vec; tx_ring->is_xdp = is_xdp; u64_stats_init(&tx_ring->r_vec->tx_sync); tx_ring->qcidx = tx_ring->idx * nn->stride_tx; tx_ring->qcp_q = nn->tx_bar + NFP_QCP_QUEUE_OFF(tx_ring->qcidx); } /** * nfp_net_rx_ring_init() - Fill in the boilerplate for a RX ring * @rx_ring: RX ring structure * @r_vec: IRQ vector servicing this ring * @idx: Ring index */ static void nfp_net_rx_ring_init(struct nfp_net_rx_ring *rx_ring, struct nfp_net_r_vector *r_vec, unsigned int idx) { struct nfp_net *nn = r_vec->nfp_net; rx_ring->idx = idx; rx_ring->r_vec = r_vec; u64_stats_init(&rx_ring->r_vec->rx_sync); rx_ring->fl_qcidx = rx_ring->idx * nn->stride_rx; rx_ring->qcp_fl = nn->rx_bar + NFP_QCP_QUEUE_OFF(rx_ring->fl_qcidx); } /** * nfp_net_aux_irq_request() - Request an auxiliary interrupt (LSC or EXN) * @nn: NFP Network structure * @ctrl_offset: Control BAR offset where IRQ configuration should be written * @format: printf-style format to construct the interrupt name * @name: Pointer to allocated space for interrupt name * @name_sz: Size of space for interrupt name * @vector_idx: Index of MSI-X vector used for this interrupt * @handler: IRQ handler to register for this interrupt */ static int nfp_net_aux_irq_request(struct nfp_net *nn, u32 ctrl_offset, const char *format, char *name, size_t name_sz, unsigned int vector_idx, irq_handler_t handler) { struct msix_entry *entry; int err; entry = &nn->irq_entries[vector_idx]; snprintf(name, name_sz, format, nfp_net_name(nn)); err = request_irq(entry->vector, handler, 0, name, nn); if (err) { nn_err(nn, "Failed to request IRQ %d (err=%d).\n", entry->vector, err); return err; } nn_writeb(nn, ctrl_offset, entry->entry); nfp_net_irq_unmask(nn, entry->entry); return 0; } /** * nfp_net_aux_irq_free() - Free an auxiliary interrupt (LSC or EXN) * @nn: NFP Network structure * @ctrl_offset: Control BAR offset where IRQ configuration should be written * @vector_idx: Index of MSI-X vector used for this interrupt */ static void nfp_net_aux_irq_free(struct nfp_net *nn, u32 ctrl_offset, unsigned int vector_idx) { nn_writeb(nn, ctrl_offset, 0xff); nn_pci_flush(nn); free_irq(nn->irq_entries[vector_idx].vector, nn); } /* Transmit * * One queue controller peripheral queue is used for transmit. The * driver en-queues packets for transmit by advancing the write * pointer. The device indicates that packets have transmitted by * advancing the read pointer. The driver maintains a local copy of * the read and write pointer in @struct nfp_net_tx_ring. The driver * keeps @wr_p in sync with the queue controller write pointer and can * determine how many packets have been transmitted by comparing its * copy of the read pointer @rd_p with the read pointer maintained by * the queue controller peripheral. */ /** * nfp_net_tx_full() - Check if the TX ring is full * @tx_ring: TX ring to check * @dcnt: Number of descriptors that need to be enqueued (must be >= 1) * * This function checks, based on the *host copy* of read/write * pointer if a given TX ring is full. The real TX queue may have * some newly made available slots. * * Return: True if the ring is full. */ static int nfp_net_tx_full(struct nfp_net_tx_ring *tx_ring, int dcnt) { return (tx_ring->wr_p - tx_ring->rd_p) >= (tx_ring->cnt - dcnt); } /* Wrappers for deciding when to stop and restart TX queues */ static int nfp_net_tx_ring_should_wake(struct nfp_net_tx_ring *tx_ring) { return !nfp_net_tx_full(tx_ring, MAX_SKB_FRAGS * 4); } static int nfp_net_tx_ring_should_stop(struct nfp_net_tx_ring *tx_ring) { return nfp_net_tx_full(tx_ring, MAX_SKB_FRAGS + 1); } /** * nfp_net_tx_ring_stop() - stop tx ring * @nd_q: netdev queue * @tx_ring: driver tx queue structure * * Safely stop TX ring. Remember that while we are running .start_xmit() * someone else may be cleaning the TX ring completions so we need to be * extra careful here. */ static void nfp_net_tx_ring_stop(struct netdev_queue *nd_q, struct nfp_net_tx_ring *tx_ring) { netif_tx_stop_queue(nd_q); /* We can race with the TX completion out of NAPI so recheck */ smp_mb(); if (unlikely(nfp_net_tx_ring_should_wake(tx_ring))) netif_tx_start_queue(nd_q); } /** * nfp_net_tx_tso() - Set up Tx descriptor for LSO * @r_vec: per-ring structure * @txbuf: Pointer to driver soft TX descriptor * @txd: Pointer to HW TX descriptor * @skb: Pointer to SKB * @md_bytes: Prepend length * * Set up Tx descriptor for LSO, do nothing for non-LSO skbs. * Return error on packet header greater than maximum supported LSO header size. */ static void nfp_net_tx_tso(struct nfp_net_r_vector *r_vec, struct nfp_net_tx_buf *txbuf, struct nfp_net_tx_desc *txd, struct sk_buff *skb, u32 md_bytes) { u32 l3_offset, l4_offset, hdrlen; u16 mss; if (!skb_is_gso(skb)) return; if (!skb->encapsulation) { l3_offset = skb_network_offset(skb); l4_offset = skb_transport_offset(skb); hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb); } else { l3_offset = skb_inner_network_offset(skb); l4_offset = skb_inner_transport_offset(skb); hdrlen = skb_inner_transport_header(skb) - skb->data + inner_tcp_hdrlen(skb); } txbuf->pkt_cnt = skb_shinfo(skb)->gso_segs; txbuf->real_len += hdrlen * (txbuf->pkt_cnt - 1); mss = skb_shinfo(skb)->gso_size & PCIE_DESC_TX_MSS_MASK; txd->l3_offset = l3_offset - md_bytes; txd->l4_offset = l4_offset - md_bytes; txd->lso_hdrlen = hdrlen - md_bytes; txd->mss = cpu_to_le16(mss); txd->flags |= PCIE_DESC_TX_LSO; u64_stats_update_begin(&r_vec->tx_sync); r_vec->tx_lso++; u64_stats_update_end(&r_vec->tx_sync); } /** * nfp_net_tx_csum() - Set TX CSUM offload flags in TX descriptor * @dp: NFP Net data path struct * @r_vec: per-ring structure * @txbuf: Pointer to driver soft TX descriptor * @txd: Pointer to TX descriptor * @skb: Pointer to SKB * * This function sets the TX checksum flags in the TX descriptor based * on the configuration and the protocol of the packet to be transmitted. */ static void nfp_net_tx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, struct nfp_net_tx_buf *txbuf, struct nfp_net_tx_desc *txd, struct sk_buff *skb) { struct ipv6hdr *ipv6h; struct iphdr *iph; u8 l4_hdr; if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM)) return; if (skb->ip_summed != CHECKSUM_PARTIAL) return; txd->flags |= PCIE_DESC_TX_CSUM; if (skb->encapsulation) txd->flags |= PCIE_DESC_TX_ENCAP; iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb); ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb); if (iph->version == 4) { txd->flags |= PCIE_DESC_TX_IP4_CSUM; l4_hdr = iph->protocol; } else if (ipv6h->version == 6) { l4_hdr = ipv6h->nexthdr; } else { nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version); return; } switch (l4_hdr) { case IPPROTO_TCP: txd->flags |= PCIE_DESC_TX_TCP_CSUM; break; case IPPROTO_UDP: txd->flags |= PCIE_DESC_TX_UDP_CSUM; break; default: nn_dp_warn(dp, "partial checksum but l4 proto=%x!\n", l4_hdr); return; } u64_stats_update_begin(&r_vec->tx_sync); if (skb->encapsulation) r_vec->hw_csum_tx_inner += txbuf->pkt_cnt; else r_vec->hw_csum_tx += txbuf->pkt_cnt; u64_stats_update_end(&r_vec->tx_sync); } static struct sk_buff * nfp_net_tls_tx(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, struct sk_buff *skb, u64 *tls_handle, int *nr_frags) { #ifdef CONFIG_TLS_DEVICE struct nfp_net_tls_offload_ctx *ntls; struct sk_buff *nskb; bool resync_pending; u32 datalen, seq; if (likely(!dp->ktls_tx)) return skb; if (!skb->sk || !tls_is_sk_tx_device_offloaded(skb->sk)) return skb; datalen = skb->len - (skb_transport_offset(skb) + tcp_hdrlen(skb)); seq = ntohl(tcp_hdr(skb)->seq); ntls = tls_driver_ctx(skb->sk, TLS_OFFLOAD_CTX_DIR_TX); resync_pending = tls_offload_tx_resync_pending(skb->sk); if (unlikely(resync_pending || ntls->next_seq != seq)) { /* Pure ACK out of order already */ if (!datalen) return skb; u64_stats_update_begin(&r_vec->tx_sync); r_vec->tls_tx_fallback++; u64_stats_update_end(&r_vec->tx_sync); nskb = tls_encrypt_skb(skb); if (!nskb) { u64_stats_update_begin(&r_vec->tx_sync); r_vec->tls_tx_no_fallback++; u64_stats_update_end(&r_vec->tx_sync); return NULL; } /* encryption wasn't necessary */ if (nskb == skb) return skb; /* we don't re-check ring space */ if (unlikely(skb_is_nonlinear(nskb))) { nn_dp_warn(dp, "tls_encrypt_skb() produced fragmented frame\n"); u64_stats_update_begin(&r_vec->tx_sync); r_vec->tx_errors++; u64_stats_update_end(&r_vec->tx_sync); dev_kfree_skb_any(nskb); return NULL; } /* jump forward, a TX may have gotten lost, need to sync TX */ if (!resync_pending && seq - ntls->next_seq < U32_MAX / 4) tls_offload_tx_resync_request(nskb->sk, seq, ntls->next_seq); *nr_frags = 0; return nskb; } if (datalen) { u64_stats_update_begin(&r_vec->tx_sync); if (!skb_is_gso(skb)) r_vec->hw_tls_tx++; else r_vec->hw_tls_tx += skb_shinfo(skb)->gso_segs; u64_stats_update_end(&r_vec->tx_sync); } memcpy(tls_handle, ntls->fw_handle, sizeof(ntls->fw_handle)); ntls->next_seq += datalen; #endif return skb; } static void nfp_net_tls_tx_undo(struct sk_buff *skb, u64 tls_handle) { #ifdef CONFIG_TLS_DEVICE struct nfp_net_tls_offload_ctx *ntls; u32 datalen, seq; if (!tls_handle) return; if (WARN_ON_ONCE(!skb->sk || !tls_is_sk_tx_device_offloaded(skb->sk))) return; datalen = skb->len - (skb_transport_offset(skb) + tcp_hdrlen(skb)); seq = ntohl(tcp_hdr(skb)->seq); ntls = tls_driver_ctx(skb->sk, TLS_OFFLOAD_CTX_DIR_TX); if (ntls->next_seq == seq + datalen) ntls->next_seq = seq; else WARN_ON_ONCE(1); #endif } static void nfp_net_tx_xmit_more_flush(struct nfp_net_tx_ring *tx_ring) { wmb(); nfp_qcp_wr_ptr_add(tx_ring->qcp_q, tx_ring->wr_ptr_add); tx_ring->wr_ptr_add = 0; } static int nfp_net_prep_tx_meta(struct sk_buff *skb, u64 tls_handle) { struct metadata_dst *md_dst = skb_metadata_dst(skb); unsigned char *data; u32 meta_id = 0; int md_bytes; if (likely(!md_dst && !tls_handle)) return 0; if (unlikely(md_dst && md_dst->type != METADATA_HW_PORT_MUX)) { if (!tls_handle) return 0; md_dst = NULL; } md_bytes = 4 + !!md_dst * 4 + !!tls_handle * 8; if (unlikely(skb_cow_head(skb, md_bytes))) return -ENOMEM; meta_id = 0; data = skb_push(skb, md_bytes) + md_bytes; if (md_dst) { data -= 4; put_unaligned_be32(md_dst->u.port_info.port_id, data); meta_id = NFP_NET_META_PORTID; } if (tls_handle) { /* conn handle is opaque, we just use u64 to be able to quickly * compare it to zero */ data -= 8; memcpy(data, &tls_handle, sizeof(tls_handle)); meta_id <<= NFP_NET_META_FIELD_SIZE; meta_id |= NFP_NET_META_CONN_HANDLE; } data -= 4; put_unaligned_be32(meta_id, data); return md_bytes; } /** * nfp_net_tx() - Main transmit entry point * @skb: SKB to transmit * @netdev: netdev structure * * Return: NETDEV_TX_OK on success. */ static netdev_tx_t nfp_net_tx(struct sk_buff *skb, struct net_device *netdev) { struct nfp_net *nn = netdev_priv(netdev); const skb_frag_t *frag; int f, nr_frags, wr_idx, md_bytes; struct nfp_net_tx_ring *tx_ring; struct nfp_net_r_vector *r_vec; struct nfp_net_tx_buf *txbuf; struct nfp_net_tx_desc *txd; struct netdev_queue *nd_q; struct nfp_net_dp *dp; dma_addr_t dma_addr; unsigned int fsize; u64 tls_handle = 0; u16 qidx; dp = &nn->dp; qidx = skb_get_queue_mapping(skb); tx_ring = &dp->tx_rings[qidx]; r_vec = tx_ring->r_vec; nr_frags = skb_shinfo(skb)->nr_frags; if (unlikely(nfp_net_tx_full(tx_ring, nr_frags + 1))) { nn_dp_warn(dp, "TX ring %d busy. wrp=%u rdp=%u\n", qidx, tx_ring->wr_p, tx_ring->rd_p); nd_q = netdev_get_tx_queue(dp->netdev, qidx); netif_tx_stop_queue(nd_q); nfp_net_tx_xmit_more_flush(tx_ring); u64_stats_update_begin(&r_vec->tx_sync); r_vec->tx_busy++; u64_stats_update_end(&r_vec->tx_sync); return NETDEV_TX_BUSY; } skb = nfp_net_tls_tx(dp, r_vec, skb, &tls_handle, &nr_frags); if (unlikely(!skb)) { nfp_net_tx_xmit_more_flush(tx_ring); return NETDEV_TX_OK; } md_bytes = nfp_net_prep_tx_meta(skb, tls_handle); if (unlikely(md_bytes < 0)) goto err_flush; /* Start with the head skbuf */ dma_addr = dma_map_single(dp->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); if (dma_mapping_error(dp->dev, dma_addr)) goto err_dma_err; wr_idx = D_IDX(tx_ring, tx_ring->wr_p); /* Stash the soft descriptor of the head then initialize it */ txbuf = &tx_ring->txbufs[wr_idx]; txbuf->skb = skb; txbuf->dma_addr = dma_addr; txbuf->fidx = -1; txbuf->pkt_cnt = 1; txbuf->real_len = skb->len; /* Build TX descriptor */ txd = &tx_ring->txds[wr_idx]; txd->offset_eop = (nr_frags ? 0 : PCIE_DESC_TX_EOP) | md_bytes; txd->dma_len = cpu_to_le16(skb_headlen(skb)); nfp_desc_set_dma_addr(txd, dma_addr); txd->data_len = cpu_to_le16(skb->len); txd->flags = 0; txd->mss = 0; txd->lso_hdrlen = 0; /* Do not reorder - tso may adjust pkt cnt, vlan may override fields */ nfp_net_tx_tso(r_vec, txbuf, txd, skb, md_bytes); nfp_net_tx_csum(dp, r_vec, txbuf, txd, skb); if (skb_vlan_tag_present(skb) && dp->ctrl & NFP_NET_CFG_CTRL_TXVLAN) { txd->flags |= PCIE_DESC_TX_VLAN; txd->vlan = cpu_to_le16(skb_vlan_tag_get(skb)); } /* Gather DMA */ if (nr_frags > 0) { __le64 second_half; /* all descs must match except for in addr, length and eop */ second_half = txd->vals8[1]; for (f = 0; f < nr_frags; f++) { frag = &skb_shinfo(skb)->frags[f]; fsize = skb_frag_size(frag); dma_addr = skb_frag_dma_map(dp->dev, frag, 0, fsize, DMA_TO_DEVICE); if (dma_mapping_error(dp->dev, dma_addr)) goto err_unmap; wr_idx = D_IDX(tx_ring, wr_idx + 1); tx_ring->txbufs[wr_idx].skb = skb; tx_ring->txbufs[wr_idx].dma_addr = dma_addr; tx_ring->txbufs[wr_idx].fidx = f; txd = &tx_ring->txds[wr_idx]; txd->dma_len = cpu_to_le16(fsize); nfp_desc_set_dma_addr(txd, dma_addr); txd->offset_eop = md_bytes | ((f == nr_frags - 1) ? PCIE_DESC_TX_EOP : 0); txd->vals8[1] = second_half; } u64_stats_update_begin(&r_vec->tx_sync); r_vec->tx_gather++; u64_stats_update_end(&r_vec->tx_sync); } skb_tx_timestamp(skb); nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx); tx_ring->wr_p += nr_frags + 1; if (nfp_net_tx_ring_should_stop(tx_ring)) nfp_net_tx_ring_stop(nd_q, tx_ring); tx_ring->wr_ptr_add += nr_frags + 1; if (__netdev_tx_sent_queue(nd_q, txbuf->real_len, netdev_xmit_more())) nfp_net_tx_xmit_more_flush(tx_ring); return NETDEV_TX_OK; err_unmap: while (--f >= 0) { frag = &skb_shinfo(skb)->frags[f]; dma_unmap_page(dp->dev, tx_ring->txbufs[wr_idx].dma_addr, skb_frag_size(frag), DMA_TO_DEVICE); tx_ring->txbufs[wr_idx].skb = NULL; tx_ring->txbufs[wr_idx].dma_addr = 0; tx_ring->txbufs[wr_idx].fidx = -2; wr_idx = wr_idx - 1; if (wr_idx < 0) wr_idx += tx_ring->cnt; } dma_unmap_single(dp->dev, tx_ring->txbufs[wr_idx].dma_addr, skb_headlen(skb), DMA_TO_DEVICE); tx_ring->txbufs[wr_idx].skb = NULL; tx_ring->txbufs[wr_idx].dma_addr = 0; tx_ring->txbufs[wr_idx].fidx = -2; err_dma_err: nn_dp_warn(dp, "Failed to map DMA TX buffer\n"); err_flush: nfp_net_tx_xmit_more_flush(tx_ring); u64_stats_update_begin(&r_vec->tx_sync); r_vec->tx_errors++; u64_stats_update_end(&r_vec->tx_sync); nfp_net_tls_tx_undo(skb, tls_handle); dev_kfree_skb_any(skb); return NETDEV_TX_OK; } /** * nfp_net_tx_complete() - Handled completed TX packets * @tx_ring: TX ring structure * @budget: NAPI budget (only used as bool to determine if in NAPI context) */ static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget) { struct nfp_net_r_vector *r_vec = tx_ring->r_vec; struct nfp_net_dp *dp = &r_vec->nfp_net->dp; struct netdev_queue *nd_q; u32 done_pkts = 0, done_bytes = 0; u32 qcp_rd_p; int todo; if (tx_ring->wr_p == tx_ring->rd_p) return; /* Work out how many descriptors have been transmitted */ qcp_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q); if (qcp_rd_p == tx_ring->qcp_rd_p) return; todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); while (todo--) { const skb_frag_t *frag; struct nfp_net_tx_buf *tx_buf; struct sk_buff *skb; int fidx, nr_frags; int idx; idx = D_IDX(tx_ring, tx_ring->rd_p++); tx_buf = &tx_ring->txbufs[idx]; skb = tx_buf->skb; if (!skb) continue; nr_frags = skb_shinfo(skb)->nr_frags; fidx = tx_buf->fidx; if (fidx == -1) { /* unmap head */ dma_unmap_single(dp->dev, tx_buf->dma_addr, skb_headlen(skb), DMA_TO_DEVICE); done_pkts += tx_buf->pkt_cnt; done_bytes += tx_buf->real_len; } else { /* unmap fragment */ frag = &skb_shinfo(skb)->frags[fidx]; dma_unmap_page(dp->dev, tx_buf->dma_addr, skb_frag_size(frag), DMA_TO_DEVICE); } /* check for last gather fragment */ if (fidx == nr_frags - 1) napi_consume_skb(skb, budget); tx_buf->dma_addr = 0; tx_buf->skb = NULL; tx_buf->fidx = -2; } tx_ring->qcp_rd_p = qcp_rd_p; u64_stats_update_begin(&r_vec->tx_sync); r_vec->tx_bytes += done_bytes; r_vec->tx_pkts += done_pkts; u64_stats_update_end(&r_vec->tx_sync); if (!dp->netdev) return; nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx); netdev_tx_completed_queue(nd_q, done_pkts, done_bytes); if (nfp_net_tx_ring_should_wake(tx_ring)) { /* Make sure TX thread will see updated tx_ring->rd_p */ smp_mb(); if (unlikely(netif_tx_queue_stopped(nd_q))) netif_tx_wake_queue(nd_q); } WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, "TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); } static bool nfp_net_xdp_complete(struct nfp_net_tx_ring *tx_ring) { struct nfp_net_r_vector *r_vec = tx_ring->r_vec; u32 done_pkts = 0, done_bytes = 0; bool done_all; int idx, todo; u32 qcp_rd_p; /* Work out how many descriptors have been transmitted */ qcp_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q); if (qcp_rd_p == tx_ring->qcp_rd_p) return true; todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); done_all = todo <= NFP_NET_XDP_MAX_COMPLETE; todo = min(todo, NFP_NET_XDP_MAX_COMPLETE); tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + todo); done_pkts = todo; while (todo--) { idx = D_IDX(tx_ring, tx_ring->rd_p); tx_ring->rd_p++; done_bytes += tx_ring->txbufs[idx].real_len; } u64_stats_update_begin(&r_vec->tx_sync); r_vec->tx_bytes += done_bytes; r_vec->tx_pkts += done_pkts; u64_stats_update_end(&r_vec->tx_sync); WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, "XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); return done_all; } /** * nfp_net_tx_ring_reset() - Free any untransmitted buffers and reset pointers * @dp: NFP Net data path struct * @tx_ring: TX ring structure * * Assumes that the device is stopped, must be idempotent. */ static void nfp_net_tx_ring_reset(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring) { const skb_frag_t *frag; struct netdev_queue *nd_q; while (!tx_ring->is_xdp && tx_ring->rd_p != tx_ring->wr_p) { struct nfp_net_tx_buf *tx_buf; struct sk_buff *skb; int idx, nr_frags; idx = D_IDX(tx_ring, tx_ring->rd_p); tx_buf = &tx_ring->txbufs[idx]; skb = tx_ring->txbufs[idx].skb; nr_frags = skb_shinfo(skb)->nr_frags; if (tx_buf->fidx == -1) { /* unmap head */ dma_unmap_single(dp->dev, tx_buf->dma_addr, skb_headlen(skb), DMA_TO_DEVICE); } else { /* unmap fragment */ frag = &skb_shinfo(skb)->frags[tx_buf->fidx]; dma_unmap_page(dp->dev, tx_buf->dma_addr, skb_frag_size(frag), DMA_TO_DEVICE); } /* check for last gather fragment */ if (tx_buf->fidx == nr_frags - 1) dev_kfree_skb_any(skb); tx_buf->dma_addr = 0; tx_buf->skb = NULL; tx_buf->fidx = -2; tx_ring->qcp_rd_p++; tx_ring->rd_p++; } memset(tx_ring->txds, 0, tx_ring->size); tx_ring->wr_p = 0; tx_ring->rd_p = 0; tx_ring->qcp_rd_p = 0; tx_ring->wr_ptr_add = 0; if (tx_ring->is_xdp || !dp->netdev) return; nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx); netdev_tx_reset_queue(nd_q); } static void nfp_net_tx_timeout(struct net_device *netdev, unsigned int txqueue) { struct nfp_net *nn = netdev_priv(netdev); nn_warn(nn, "TX watchdog timeout on ring: %u\n", txqueue); } /* Receive processing */ static unsigned int nfp_net_calc_fl_bufsz(struct nfp_net_dp *dp) { unsigned int fl_bufsz; fl_bufsz = NFP_NET_RX_BUF_HEADROOM; fl_bufsz += dp->rx_dma_off; if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) fl_bufsz += NFP_NET_MAX_PREPEND; else fl_bufsz += dp->rx_offset; fl_bufsz += ETH_HLEN + VLAN_HLEN * 2 + dp->mtu; fl_bufsz = SKB_DATA_ALIGN(fl_bufsz); fl_bufsz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); return fl_bufsz; } static void nfp_net_free_frag(void *frag, bool xdp) { if (!xdp) skb_free_frag(frag); else __free_page(virt_to_page(frag)); } /** * nfp_net_rx_alloc_one() - Allocate and map page frag for RX * @dp: NFP Net data path struct * @dma_addr: Pointer to storage for DMA address (output param) * * This function will allcate a new page frag, map it for DMA. * * Return: allocated page frag or NULL on failure. */ static void *nfp_net_rx_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr) { void *frag; if (!dp->xdp_prog) { frag = netdev_alloc_frag(dp->fl_bufsz); } else { struct page *page; page = alloc_page(GFP_KERNEL); frag = page ? page_address(page) : NULL; } if (!frag) { nn_dp_warn(dp, "Failed to alloc receive page frag\n"); return NULL; } *dma_addr = nfp_net_dma_map_rx(dp, frag); if (dma_mapping_error(dp->dev, *dma_addr)) { nfp_net_free_frag(frag, dp->xdp_prog); nn_dp_warn(dp, "Failed to map DMA RX buffer\n"); return NULL; } return frag; } static void *nfp_net_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr) { void *frag; if (!dp->xdp_prog) { frag = napi_alloc_frag(dp->fl_bufsz); if (unlikely(!frag)) return NULL; } else { struct page *page; page = dev_alloc_page(); if (unlikely(!page)) return NULL; frag = page_address(page); } *dma_addr = nfp_net_dma_map_rx(dp, frag); if (dma_mapping_error(dp->dev, *dma_addr)) { nfp_net_free_frag(frag, dp->xdp_prog); nn_dp_warn(dp, "Failed to map DMA RX buffer\n"); return NULL; } return frag; } /** * nfp_net_rx_give_one() - Put mapped skb on the software and hardware rings * @dp: NFP Net data path struct * @rx_ring: RX ring structure * @frag: page fragment buffer * @dma_addr: DMA address of skb mapping */ static void nfp_net_rx_give_one(const struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring, void *frag, dma_addr_t dma_addr) { unsigned int wr_idx; wr_idx = D_IDX(rx_ring, rx_ring->wr_p); nfp_net_dma_sync_dev_rx(dp, dma_addr); /* Stash SKB and DMA address away */ rx_ring->rxbufs[wr_idx].frag = frag; rx_ring->rxbufs[wr_idx].dma_addr = dma_addr; /* Fill freelist descriptor */ rx_ring->rxds[wr_idx].fld.reserved = 0; rx_ring->rxds[wr_idx].fld.meta_len_dd = 0; nfp_desc_set_dma_addr(&rx_ring->rxds[wr_idx].fld, dma_addr + dp->rx_dma_off); rx_ring->wr_p++; if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) { /* Update write pointer of the freelist queue. Make * sure all writes are flushed before telling the hardware. */ wmb(); nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH); } } /** * nfp_net_rx_ring_reset() - Reflect in SW state of freelist after disable * @rx_ring: RX ring structure * * Assumes that the device is stopped, must be idempotent. */ static void nfp_net_rx_ring_reset(struct nfp_net_rx_ring *rx_ring) { unsigned int wr_idx, last_idx; /* wr_p == rd_p means ring was never fed FL bufs. RX rings are always * kept at cnt - 1 FL bufs. */ if (rx_ring->wr_p == 0 && rx_ring->rd_p == 0) return; /* Move the empty entry to the end of the list */ wr_idx = D_IDX(rx_ring, rx_ring->wr_p); last_idx = rx_ring->cnt - 1; rx_ring->rxbufs[wr_idx].dma_addr = rx_ring->rxbufs[last_idx].dma_addr; rx_ring->rxbufs[wr_idx].frag = rx_ring->rxbufs[last_idx].frag; rx_ring->rxbufs[last_idx].dma_addr = 0; rx_ring->rxbufs[last_idx].frag = NULL; memset(rx_ring->rxds, 0, rx_ring->size); rx_ring->wr_p = 0; rx_ring->rd_p = 0; } /** * nfp_net_rx_ring_bufs_free() - Free any buffers currently on the RX ring * @dp: NFP Net data path struct * @rx_ring: RX ring to remove buffers from * * Assumes that the device is stopped and buffers are in [0, ring->cnt - 1) * entries. After device is disabled nfp_net_rx_ring_reset() must be called * to restore required ring geometry. */ static void nfp_net_rx_ring_bufs_free(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring) { unsigned int i; for (i = 0; i < rx_ring->cnt - 1; i++) { /* NULL skb can only happen when initial filling of the ring * fails to allocate enough buffers and calls here to free * already allocated ones. */ if (!rx_ring->rxbufs[i].frag) continue; nfp_net_dma_unmap_rx(dp, rx_ring->rxbufs[i].dma_addr); nfp_net_free_frag(rx_ring->rxbufs[i].frag, dp->xdp_prog); rx_ring->rxbufs[i].dma_addr = 0; rx_ring->rxbufs[i].frag = NULL; } } /** * nfp_net_rx_ring_bufs_alloc() - Fill RX ring with buffers (don't give to FW) * @dp: NFP Net data path struct * @rx_ring: RX ring to remove buffers from */ static int nfp_net_rx_ring_bufs_alloc(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring) { struct nfp_net_rx_buf *rxbufs; unsigned int i; rxbufs = rx_ring->rxbufs; for (i = 0; i < rx_ring->cnt - 1; i++) { rxbufs[i].frag = nfp_net_rx_alloc_one(dp, &rxbufs[i].dma_addr); if (!rxbufs[i].frag) { nfp_net_rx_ring_bufs_free(dp, rx_ring); return -ENOMEM; } } return 0; } /** * nfp_net_rx_ring_fill_freelist() - Give buffers from the ring to FW * @dp: NFP Net data path struct * @rx_ring: RX ring to fill */ static void nfp_net_rx_ring_fill_freelist(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring) { unsigned int i; for (i = 0; i < rx_ring->cnt - 1; i++) nfp_net_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag, rx_ring->rxbufs[i].dma_addr); } /** * nfp_net_rx_csum_has_errors() - group check if rxd has any csum errors * @flags: RX descriptor flags field in CPU byte order */ static int nfp_net_rx_csum_has_errors(u16 flags) { u16 csum_all_checked, csum_all_ok; csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL; csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK; return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT); } /** * nfp_net_rx_csum() - set SKB checksum field based on RX descriptor flags * @dp: NFP Net data path struct * @r_vec: per-ring structure * @rxd: Pointer to RX descriptor * @meta: Parsed metadata prepend * @skb: Pointer to SKB */ static void nfp_net_rx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, struct nfp_net_rx_desc *rxd, struct nfp_meta_parsed *meta, struct sk_buff *skb) { skb_checksum_none_assert(skb); if (!(dp->netdev->features & NETIF_F_RXCSUM)) return; if (meta->csum_type) { skb->ip_summed = meta->csum_type; skb->csum = meta->csum; u64_stats_update_begin(&r_vec->rx_sync); r_vec->hw_csum_rx_complete++; u64_stats_update_end(&r_vec->rx_sync); return; } if (nfp_net_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) { u64_stats_update_begin(&r_vec->rx_sync); r_vec->hw_csum_rx_error++; u64_stats_update_end(&r_vec->rx_sync); return; } /* Assume that the firmware will never report inner CSUM_OK unless outer * L4 headers were successfully parsed. FW will always report zero UDP * checksum as CSUM_OK. */ if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK || rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) { __skb_incr_checksum_unnecessary(skb); u64_stats_update_begin(&r_vec->rx_sync); r_vec->hw_csum_rx_ok++; u64_stats_update_end(&r_vec->rx_sync); } if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK || rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) { __skb_incr_checksum_unnecessary(skb); u64_stats_update_begin(&r_vec->rx_sync); r_vec->hw_csum_rx_inner_ok++; u64_stats_update_end(&r_vec->rx_sync); } } static void nfp_net_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta, unsigned int type, __be32 *hash) { if (!(netdev->features & NETIF_F_RXHASH)) return; switch (type) { case NFP_NET_RSS_IPV4: case NFP_NET_RSS_IPV6: case NFP_NET_RSS_IPV6_EX: meta->hash_type = PKT_HASH_TYPE_L3; break; default: meta->hash_type = PKT_HASH_TYPE_L4; break; } meta->hash = get_unaligned_be32(hash); } static void nfp_net_set_hash_desc(struct net_device *netdev, struct nfp_meta_parsed *meta, void *data, struct nfp_net_rx_desc *rxd) { struct nfp_net_rx_hash *rx_hash = data; if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS)) return; nfp_net_set_hash(netdev, meta, get_unaligned_be32(&rx_hash->hash_type), &rx_hash->hash); } static bool nfp_net_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta, void *data, void *pkt, unsigned int pkt_len, int meta_len) { u32 meta_info; meta_info = get_unaligned_be32(data); data += 4; while (meta_info) { switch (meta_info & NFP_NET_META_FIELD_MASK) { case NFP_NET_META_HASH: meta_info >>= NFP_NET_META_FIELD_SIZE; nfp_net_set_hash(netdev, meta, meta_info & NFP_NET_META_FIELD_MASK, (__be32 *)data); data += 4; break; case NFP_NET_META_MARK: meta->mark = get_unaligned_be32(data); data += 4; break; case NFP_NET_META_PORTID: meta->portid = get_unaligned_be32(data); data += 4; break; case NFP_NET_META_CSUM: meta->csum_type = CHECKSUM_COMPLETE; meta->csum = (__force __wsum)__get_unaligned_cpu32(data); data += 4; break; case NFP_NET_META_RESYNC_INFO: if (nfp_net_tls_rx_resync_req(netdev, data, pkt, pkt_len)) return false; data += sizeof(struct nfp_net_tls_resync_req); break; default: return true; } meta_info >>= NFP_NET_META_FIELD_SIZE; } return data != pkt; } static void nfp_net_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf, struct sk_buff *skb) { u64_stats_update_begin(&r_vec->rx_sync); r_vec->rx_drops++; /* If we have both skb and rxbuf the replacement buffer allocation * must have failed, count this as an alloc failure. */ if (skb && rxbuf) r_vec->rx_replace_buf_alloc_fail++; u64_stats_update_end(&r_vec->rx_sync); /* skb is build based on the frag, free_skb() would free the frag * so to be able to reuse it we need an extra ref. */ if (skb && rxbuf && skb->head == rxbuf->frag) page_ref_inc(virt_to_head_page(rxbuf->frag)); if (rxbuf) nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr); if (skb) dev_kfree_skb_any(skb); } static bool nfp_net_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring, struct nfp_net_tx_ring *tx_ring, struct nfp_net_rx_buf *rxbuf, unsigned int dma_off, unsigned int pkt_len, bool *completed) { unsigned int dma_map_sz = dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA; struct nfp_net_tx_buf *txbuf; struct nfp_net_tx_desc *txd; int wr_idx; /* Reject if xdp_adjust_tail grow packet beyond DMA area */ if (pkt_len + dma_off > dma_map_sz) return false; if (unlikely(nfp_net_tx_full(tx_ring, 1))) { if (!*completed) { nfp_net_xdp_complete(tx_ring); *completed = true; } if (unlikely(nfp_net_tx_full(tx_ring, 1))) { nfp_net_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf, NULL); return false; } } wr_idx = D_IDX(tx_ring, tx_ring->wr_p); /* Stash the soft descriptor of the head then initialize it */ txbuf = &tx_ring->txbufs[wr_idx]; nfp_net_rx_give_one(dp, rx_ring, txbuf->frag, txbuf->dma_addr); txbuf->frag = rxbuf->frag; txbuf->dma_addr = rxbuf->dma_addr; txbuf->fidx = -1; txbuf->pkt_cnt = 1; txbuf->real_len = pkt_len; dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off, pkt_len, DMA_BIDIRECTIONAL); /* Build TX descriptor */ txd = &tx_ring->txds[wr_idx]; txd->offset_eop = PCIE_DESC_TX_EOP; txd->dma_len = cpu_to_le16(pkt_len); nfp_desc_set_dma_addr(txd, rxbuf->dma_addr + dma_off); txd->data_len = cpu_to_le16(pkt_len); txd->flags = 0; txd->mss = 0; txd->lso_hdrlen = 0; tx_ring->wr_p++; tx_ring->wr_ptr_add++; return true; } /** * nfp_net_rx() - receive up to @budget packets on @rx_ring * @rx_ring: RX ring to receive from * @budget: NAPI budget * * Note, this function is separated out from the napi poll function to * more cleanly separate packet receive code from other bookkeeping * functions performed in the napi poll function. * * Return: Number of packets received. */ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget) { struct nfp_net_r_vector *r_vec = rx_ring->r_vec; struct nfp_net_dp *dp = &r_vec->nfp_net->dp; struct nfp_net_tx_ring *tx_ring; struct bpf_prog *xdp_prog; bool xdp_tx_cmpl = false; unsigned int true_bufsz; struct sk_buff *skb; int pkts_polled = 0; struct xdp_buff xdp; int idx; xdp_prog = READ_ONCE(dp->xdp_prog); true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz; xdp_init_buff(&xdp, PAGE_SIZE - NFP_NET_RX_BUF_HEADROOM, &rx_ring->xdp_rxq); tx_ring = r_vec->xdp_ring; while (pkts_polled < budget) { unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; struct nfp_net_rx_buf *rxbuf; struct nfp_net_rx_desc *rxd; struct nfp_meta_parsed meta; bool redir_egress = false; struct net_device *netdev; dma_addr_t new_dma_addr; u32 meta_len_xdp = 0; void *new_frag; idx = D_IDX(rx_ring, rx_ring->rd_p); rxd = &rx_ring->rxds[idx]; if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) break; /* Memory barrier to ensure that we won't do other reads * before the DD bit. */ dma_rmb(); memset(&meta, 0, sizeof(meta)); rx_ring->rd_p++; pkts_polled++; rxbuf = &rx_ring->rxbufs[idx]; /* < meta_len > * <-- [rx_offset] --> * --------------------------------------------------------- * | [XX] | metadata | packet | XXXX | * --------------------------------------------------------- * <---------------- data_len ---------------> * * The rx_offset is fixed for all packets, the meta_len can vary * on a packet by packet basis. If rx_offset is set to zero * (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the * buffer and is immediately followed by the packet (no [XX]). */ meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; data_len = le16_to_cpu(rxd->rxd.data_len); pkt_len = data_len - meta_len; pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) pkt_off += meta_len; else pkt_off += dp->rx_offset; meta_off = pkt_off - meta_len; /* Stats update */ u64_stats_update_begin(&r_vec->rx_sync); r_vec->rx_pkts++; r_vec->rx_bytes += pkt_len; u64_stats_update_end(&r_vec->rx_sync); if (unlikely(meta_len > NFP_NET_MAX_PREPEND || (dp->rx_offset && meta_len > dp->rx_offset))) { nn_dp_warn(dp, "oversized RX packet metadata %u\n", meta_len); nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); continue; } nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len); if (!dp->chained_metadata_format) { nfp_net_set_hash_desc(dp->netdev, &meta, rxbuf->frag + meta_off, rxd); } else if (meta_len) { if (unlikely(nfp_net_parse_meta(dp->netdev, &meta, rxbuf->frag + meta_off, rxbuf->frag + pkt_off, pkt_len, meta_len))) { nn_dp_warn(dp, "invalid RX packet metadata\n"); nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); continue; } } if (xdp_prog && !meta.portid) { void *orig_data = rxbuf->frag + pkt_off; unsigned int dma_off; int act; xdp_prepare_buff(&xdp, rxbuf->frag + NFP_NET_RX_BUF_HEADROOM, pkt_off - NFP_NET_RX_BUF_HEADROOM, pkt_len, true); act = bpf_prog_run_xdp(xdp_prog, &xdp); pkt_len = xdp.data_end - xdp.data; pkt_off += xdp.data - orig_data; switch (act) { case XDP_PASS: meta_len_xdp = xdp.data - xdp.data_meta; break; case XDP_TX: dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM; if (unlikely(!nfp_net_tx_xdp_buf(dp, rx_ring, tx_ring, rxbuf, dma_off, pkt_len, &xdp_tx_cmpl))) trace_xdp_exception(dp->netdev, xdp_prog, act); continue; default: bpf_warn_invalid_xdp_action(act); fallthrough; case XDP_ABORTED: trace_xdp_exception(dp->netdev, xdp_prog, act); fallthrough; case XDP_DROP: nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr); continue; } } if (likely(!meta.portid)) { netdev = dp->netdev; } else if (meta.portid == NFP_META_PORT_ID_CTRL) { struct nfp_net *nn = netdev_priv(dp->netdev); nfp_app_ctrl_rx_raw(nn->app, rxbuf->frag + pkt_off, pkt_len); nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr); continue; } else { struct nfp_net *nn; nn = netdev_priv(dp->netdev); netdev = nfp_app_dev_get(nn->app, meta.portid, &redir_egress); if (unlikely(!netdev)) { nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); continue; } if (nfp_netdev_is_nfp_repr(netdev)) nfp_repr_inc_rx_stats(netdev, pkt_len); } skb = build_skb(rxbuf->frag, true_bufsz); if (unlikely(!skb)) { nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); continue; } new_frag = nfp_net_napi_alloc_one(dp, &new_dma_addr); if (unlikely(!new_frag)) { nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); continue; } nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); nfp_net_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); skb_reserve(skb, pkt_off); skb_put(skb, pkt_len); skb->mark = meta.mark; skb_set_hash(skb, meta.hash, meta.hash_type); skb_record_rx_queue(skb, rx_ring->idx); skb->protocol = eth_type_trans(skb, netdev); nfp_net_rx_csum(dp, r_vec, rxd, &meta, skb); #ifdef CONFIG_TLS_DEVICE if (rxd->rxd.flags & PCIE_DESC_RX_DECRYPTED) { skb->decrypted = true; u64_stats_update_begin(&r_vec->rx_sync); r_vec->hw_tls_rx++; u64_stats_update_end(&r_vec->rx_sync); } #endif if (rxd->rxd.flags & PCIE_DESC_RX_VLAN) __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), le16_to_cpu(rxd->rxd.vlan)); if (meta_len_xdp) skb_metadata_set(skb, meta_len_xdp); if (likely(!redir_egress)) { napi_gro_receive(&rx_ring->r_vec->napi, skb); } else { skb->dev = netdev; skb_reset_network_header(skb); __skb_push(skb, ETH_HLEN); dev_queue_xmit(skb); } } if (xdp_prog) { if (tx_ring->wr_ptr_add) nfp_net_tx_xmit_more_flush(tx_ring); else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) && !xdp_tx_cmpl) if (!nfp_net_xdp_complete(tx_ring)) pkts_polled = budget; } return pkts_polled; } /** * nfp_net_poll() - napi poll function * @napi: NAPI structure * @budget: NAPI budget * * Return: number of packets polled. */ static int nfp_net_poll(struct napi_struct *napi, int budget) { struct nfp_net_r_vector *r_vec = container_of(napi, struct nfp_net_r_vector, napi); unsigned int pkts_polled = 0; if (r_vec->tx_ring) nfp_net_tx_complete(r_vec->tx_ring, budget); if (r_vec->rx_ring) pkts_polled = nfp_net_rx(r_vec->rx_ring, budget); if (pkts_polled < budget) if (napi_complete_done(napi, pkts_polled)) nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); if (r_vec->nfp_net->rx_coalesce_adapt_on) { struct dim_sample dim_sample = {}; unsigned int start; u64 pkts, bytes; do { start = u64_stats_fetch_begin(&r_vec->rx_sync); pkts = r_vec->rx_pkts; bytes = r_vec->rx_bytes; } while (u64_stats_fetch_retry(&r_vec->rx_sync, start)); dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample); net_dim(&r_vec->rx_dim, dim_sample); } if (r_vec->nfp_net->tx_coalesce_adapt_on) { struct dim_sample dim_sample = {}; unsigned int start; u64 pkts, bytes; do { start = u64_stats_fetch_begin(&r_vec->tx_sync); pkts = r_vec->tx_pkts; bytes = r_vec->tx_bytes; } while (u64_stats_fetch_retry(&r_vec->tx_sync, start)); dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample); net_dim(&r_vec->tx_dim, dim_sample); } return pkts_polled; } /* Control device data path */ static bool nfp_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, struct sk_buff *skb, bool old) { unsigned int real_len = skb->len, meta_len = 0; struct nfp_net_tx_ring *tx_ring; struct nfp_net_tx_buf *txbuf; struct nfp_net_tx_desc *txd; struct nfp_net_dp *dp; dma_addr_t dma_addr; int wr_idx; dp = &r_vec->nfp_net->dp; tx_ring = r_vec->tx_ring; if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) { nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n"); goto err_free; } if (unlikely(nfp_net_tx_full(tx_ring, 1))) { u64_stats_update_begin(&r_vec->tx_sync); r_vec->tx_busy++; u64_stats_update_end(&r_vec->tx_sync); if (!old) __skb_queue_tail(&r_vec->queue, skb); else __skb_queue_head(&r_vec->queue, skb); return true; } if (nfp_app_ctrl_has_meta(nn->app)) { if (unlikely(skb_headroom(skb) < 8)) { nn_dp_warn(dp, "CTRL TX on skb without headroom\n"); goto err_free; } meta_len = 8; put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4)); put_unaligned_be32(NFP_NET_META_PORTID, skb_push(skb, 4)); } /* Start with the head skbuf */ dma_addr = dma_map_single(dp->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); if (dma_mapping_error(dp->dev, dma_addr)) goto err_dma_warn; wr_idx = D_IDX(tx_ring, tx_ring->wr_p); /* Stash the soft descriptor of the head then initialize it */ txbuf = &tx_ring->txbufs[wr_idx]; txbuf->skb = skb; txbuf->dma_addr = dma_addr; txbuf->fidx = -1; txbuf->pkt_cnt = 1; txbuf->real_len = real_len; /* Build TX descriptor */ txd = &tx_ring->txds[wr_idx]; txd->offset_eop = meta_len | PCIE_DESC_TX_EOP; txd->dma_len = cpu_to_le16(skb_headlen(skb)); nfp_desc_set_dma_addr(txd, dma_addr); txd->data_len = cpu_to_le16(skb->len); txd->flags = 0; txd->mss = 0; txd->lso_hdrlen = 0; tx_ring->wr_p++; tx_ring->wr_ptr_add++; nfp_net_tx_xmit_more_flush(tx_ring); return false; err_dma_warn: nn_dp_warn(dp, "Failed to DMA map TX CTRL buffer\n"); err_free: u64_stats_update_begin(&r_vec->tx_sync); r_vec->tx_errors++; u64_stats_update_end(&r_vec->tx_sync); dev_kfree_skb_any(skb); return false; } bool __nfp_ctrl_tx(struct nfp_net *nn, struct sk_buff *skb) { struct nfp_net_r_vector *r_vec = &nn->r_vecs[0]; return nfp_ctrl_tx_one(nn, r_vec, skb, false); } bool nfp_ctrl_tx(struct nfp_net *nn, struct sk_buff *skb) { struct nfp_net_r_vector *r_vec = &nn->r_vecs[0]; bool ret; spin_lock_bh(&r_vec->lock); ret = nfp_ctrl_tx_one(nn, r_vec, skb, false); spin_unlock_bh(&r_vec->lock); return ret; } static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec) { struct sk_buff *skb; while ((skb = __skb_dequeue(&r_vec->queue))) if (nfp_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true)) return; } static bool nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len) { u32 meta_type, meta_tag; if (!nfp_app_ctrl_has_meta(nn->app)) return !meta_len; if (meta_len != 8) return false; meta_type = get_unaligned_be32(data); meta_tag = get_unaligned_be32(data + 4); return (meta_type == NFP_NET_META_PORTID && meta_tag == NFP_META_PORT_ID_CTRL); } static bool nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring) { unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; struct nfp_net_rx_buf *rxbuf; struct nfp_net_rx_desc *rxd; dma_addr_t new_dma_addr; struct sk_buff *skb; void *new_frag; int idx; idx = D_IDX(rx_ring, rx_ring->rd_p); rxd = &rx_ring->rxds[idx]; if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) return false; /* Memory barrier to ensure that we won't do other reads * before the DD bit. */ dma_rmb(); rx_ring->rd_p++; rxbuf = &rx_ring->rxbufs[idx]; meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; data_len = le16_to_cpu(rxd->rxd.data_len); pkt_len = data_len - meta_len; pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) pkt_off += meta_len; else pkt_off += dp->rx_offset; meta_off = pkt_off - meta_len; /* Stats update */ u64_stats_update_begin(&r_vec->rx_sync); r_vec->rx_pkts++; r_vec->rx_bytes += pkt_len; u64_stats_update_end(&r_vec->rx_sync); nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len); if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) { nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n", meta_len); nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); return true; } skb = build_skb(rxbuf->frag, dp->fl_bufsz); if (unlikely(!skb)) { nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); return true; } new_frag = nfp_net_napi_alloc_one(dp, &new_dma_addr); if (unlikely(!new_frag)) { nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); return true; } nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); nfp_net_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); skb_reserve(skb, pkt_off); skb_put(skb, pkt_len); nfp_app_ctrl_rx(nn->app, skb); return true; } static bool nfp_ctrl_rx(struct nfp_net_r_vector *r_vec) { struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring; struct nfp_net *nn = r_vec->nfp_net; struct nfp_net_dp *dp = &nn->dp; unsigned int budget = 512; while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring) && budget--) continue; return budget; } static void nfp_ctrl_poll(struct tasklet_struct *t) { struct nfp_net_r_vector *r_vec = from_tasklet(r_vec, t, tasklet); spin_lock(&r_vec->lock); nfp_net_tx_complete(r_vec->tx_ring, 0); __nfp_ctrl_tx_queued(r_vec); spin_unlock(&r_vec->lock); if (nfp_ctrl_rx(r_vec)) { nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); } else { tasklet_schedule(&r_vec->tasklet); nn_dp_warn(&r_vec->nfp_net->dp, "control message budget exceeded!\n"); } } /* Setup and Configuration */ /** * nfp_net_vecs_init() - Assign IRQs and setup rvecs. * @nn: NFP Network structure */ static void nfp_net_vecs_init(struct nfp_net *nn) { struct nfp_net_r_vector *r_vec; int r; nn->lsc_handler = nfp_net_irq_lsc; nn->exn_handler = nfp_net_irq_exn; for (r = 0; r < nn->max_r_vecs; r++) { struct msix_entry *entry; entry = &nn->irq_entries[NFP_NET_NON_Q_VECTORS + r]; r_vec = &nn->r_vecs[r]; r_vec->nfp_net = nn; r_vec->irq_entry = entry->entry; r_vec->irq_vector = entry->vector; if (nn->dp.netdev) { r_vec->handler = nfp_net_irq_rxtx; } else { r_vec->handler = nfp_ctrl_irq_rxtx; __skb_queue_head_init(&r_vec->queue); spin_lock_init(&r_vec->lock); tasklet_setup(&r_vec->tasklet, nfp_ctrl_poll); tasklet_disable(&r_vec->tasklet); } cpumask_set_cpu(r, &r_vec->affinity_mask); } } /** * nfp_net_tx_ring_free() - Free resources allocated to a TX ring * @tx_ring: TX ring to free */ static void nfp_net_tx_ring_free(struct nfp_net_tx_ring *tx_ring) { struct nfp_net_r_vector *r_vec = tx_ring->r_vec; struct nfp_net_dp *dp = &r_vec->nfp_net->dp; kvfree(tx_ring->txbufs); if (tx_ring->txds) dma_free_coherent(dp->dev, tx_ring->size, tx_ring->txds, tx_ring->dma); tx_ring->cnt = 0; tx_ring->txbufs = NULL; tx_ring->txds = NULL; tx_ring->dma = 0; tx_ring->size = 0; } /** * nfp_net_tx_ring_alloc() - Allocate resource for a TX ring * @dp: NFP Net data path struct * @tx_ring: TX Ring structure to allocate * * Return: 0 on success, negative errno otherwise. */ static int nfp_net_tx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring) { struct nfp_net_r_vector *r_vec = tx_ring->r_vec; tx_ring->cnt = dp->txd_cnt; tx_ring->size = array_size(tx_ring->cnt, sizeof(*tx_ring->txds)); tx_ring->txds = dma_alloc_coherent(dp->dev, tx_ring->size, &tx_ring->dma, GFP_KERNEL | __GFP_NOWARN); if (!tx_ring->txds) { netdev_warn(dp->netdev, "failed to allocate TX descriptor ring memory, requested descriptor count: %d, consider lowering descriptor count\n", tx_ring->cnt); goto err_alloc; } tx_ring->txbufs = kvcalloc(tx_ring->cnt, sizeof(*tx_ring->txbufs), GFP_KERNEL); if (!tx_ring->txbufs) goto err_alloc; if (!tx_ring->is_xdp && dp->netdev) netif_set_xps_queue(dp->netdev, &r_vec->affinity_mask, tx_ring->idx); return 0; err_alloc: nfp_net_tx_ring_free(tx_ring); return -ENOMEM; } static void nfp_net_tx_ring_bufs_free(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring) { unsigned int i; if (!tx_ring->is_xdp) return; for (i = 0; i < tx_ring->cnt; i++) { if (!tx_ring->txbufs[i].frag) return; nfp_net_dma_unmap_rx(dp, tx_ring->txbufs[i].dma_addr); __free_page(virt_to_page(tx_ring->txbufs[i].frag)); } } static int nfp_net_tx_ring_bufs_alloc(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring) { struct nfp_net_tx_buf *txbufs = tx_ring->txbufs; unsigned int i; if (!tx_ring->is_xdp) return 0; for (i = 0; i < tx_ring->cnt; i++) { txbufs[i].frag = nfp_net_rx_alloc_one(dp, &txbufs[i].dma_addr); if (!txbufs[i].frag) { nfp_net_tx_ring_bufs_free(dp, tx_ring); return -ENOMEM; } } return 0; } static int nfp_net_tx_rings_prepare(struct nfp_net *nn, struct nfp_net_dp *dp) { unsigned int r; dp->tx_rings = kcalloc(dp->num_tx_rings, sizeof(*dp->tx_rings), GFP_KERNEL); if (!dp->tx_rings) return -ENOMEM; for (r = 0; r < dp->num_tx_rings; r++) { int bias = 0; if (r >= dp->num_stack_tx_rings) bias = dp->num_stack_tx_rings; nfp_net_tx_ring_init(&dp->tx_rings[r], &nn->r_vecs[r - bias], r, bias); if (nfp_net_tx_ring_alloc(dp, &dp->tx_rings[r])) goto err_free_prev; if (nfp_net_tx_ring_bufs_alloc(dp, &dp->tx_rings[r])) goto err_free_ring; } return 0; err_free_prev: while (r--) { nfp_net_tx_ring_bufs_free(dp, &dp->tx_rings[r]); err_free_ring: nfp_net_tx_ring_free(&dp->tx_rings[r]); } kfree(dp->tx_rings); return -ENOMEM; } static void nfp_net_tx_rings_free(struct nfp_net_dp *dp) { unsigned int r; for (r = 0; r < dp->num_tx_rings; r++) { nfp_net_tx_ring_bufs_free(dp, &dp->tx_rings[r]); nfp_net_tx_ring_free(&dp->tx_rings[r]); } kfree(dp->tx_rings); } /** * nfp_net_rx_ring_free() - Free resources allocated to a RX ring * @rx_ring: RX ring to free */ static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring) { struct nfp_net_r_vector *r_vec = rx_ring->r_vec; struct nfp_net_dp *dp = &r_vec->nfp_net->dp; if (dp->netdev) xdp_rxq_info_unreg(&rx_ring->xdp_rxq); kvfree(rx_ring->rxbufs); if (rx_ring->rxds) dma_free_coherent(dp->dev, rx_ring->size, rx_ring->rxds, rx_ring->dma); rx_ring->cnt = 0; rx_ring->rxbufs = NULL; rx_ring->rxds = NULL; rx_ring->dma = 0; rx_ring->size = 0; } /** * nfp_net_rx_ring_alloc() - Allocate resource for a RX ring * @dp: NFP Net data path struct * @rx_ring: RX ring to allocate * * Return: 0 on success, negative errno otherwise. */ static int nfp_net_rx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring) { int err; if (dp->netdev) { err = xdp_rxq_info_reg(&rx_ring->xdp_rxq, dp->netdev, rx_ring->idx, rx_ring->r_vec->napi.napi_id); if (err < 0) return err; } rx_ring->cnt = dp->rxd_cnt; rx_ring->size = array_size(rx_ring->cnt, sizeof(*rx_ring->rxds)); rx_ring->rxds = dma_alloc_coherent(dp->dev, rx_ring->size, &rx_ring->dma, GFP_KERNEL | __GFP_NOWARN); if (!rx_ring->rxds) { netdev_warn(dp->netdev, "failed to allocate RX descriptor ring memory, requested descriptor count: %d, consider lowering descriptor count\n", rx_ring->cnt); goto err_alloc; } rx_ring->rxbufs = kvcalloc(rx_ring->cnt, sizeof(*rx_ring->rxbufs), GFP_KERNEL); if (!rx_ring->rxbufs) goto err_alloc; return 0; err_alloc: nfp_net_rx_ring_free(rx_ring); return -ENOMEM; } static int nfp_net_rx_rings_prepare(struct nfp_net *nn, struct nfp_net_dp *dp) { unsigned int r; dp->rx_rings = kcalloc(dp->num_rx_rings, sizeof(*dp->rx_rings), GFP_KERNEL); if (!dp->rx_rings) return -ENOMEM; for (r = 0; r < dp->num_rx_rings; r++) { nfp_net_rx_ring_init(&dp->rx_rings[r], &nn->r_vecs[r], r); if (nfp_net_rx_ring_alloc(dp, &dp->rx_rings[r])) goto err_free_prev; if (nfp_net_rx_ring_bufs_alloc(dp, &dp->rx_rings[r])) goto err_free_ring; } return 0; err_free_prev: while (r--) { nfp_net_rx_ring_bufs_free(dp, &dp->rx_rings[r]); err_free_ring: nfp_net_rx_ring_free(&dp->rx_rings[r]); } kfree(dp->rx_rings); return -ENOMEM; } static void nfp_net_rx_rings_free(struct nfp_net_dp *dp) { unsigned int r; for (r = 0; r < dp->num_rx_rings; r++) { nfp_net_rx_ring_bufs_free(dp, &dp->rx_rings[r]); nfp_net_rx_ring_free(&dp->rx_rings[r]); } kfree(dp->rx_rings); } static void nfp_net_vector_assign_rings(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, int idx) { r_vec->rx_ring = idx < dp->num_rx_rings ? &dp->rx_rings[idx] : NULL; r_vec->tx_ring = idx < dp->num_stack_tx_rings ? &dp->tx_rings[idx] : NULL; r_vec->xdp_ring = idx < dp->num_tx_rings - dp->num_stack_tx_rings ? &dp->tx_rings[dp->num_stack_tx_rings + idx] : NULL; } static int nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, int idx) { int err; /* Setup NAPI */ if (nn->dp.netdev) netif_napi_add(nn->dp.netdev, &r_vec->napi, nfp_net_poll, NAPI_POLL_WEIGHT); else tasklet_enable(&r_vec->tasklet); snprintf(r_vec->name, sizeof(r_vec->name), "%s-rxtx-%d", nfp_net_name(nn), idx); err = request_irq(r_vec->irq_vector, r_vec->handler, 0, r_vec->name, r_vec); if (err) { if (nn->dp.netdev) netif_napi_del(&r_vec->napi); else tasklet_disable(&r_vec->tasklet); nn_err(nn, "Error requesting IRQ %d\n", r_vec->irq_vector); return err; } disable_irq(r_vec->irq_vector); irq_set_affinity_hint(r_vec->irq_vector, &r_vec->affinity_mask); nn_dbg(nn, "RV%02d: irq=%03d/%03d\n", idx, r_vec->irq_vector, r_vec->irq_entry); return 0; } static void nfp_net_cleanup_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec) { irq_set_affinity_hint(r_vec->irq_vector, NULL); if (nn->dp.netdev) netif_napi_del(&r_vec->napi); else tasklet_disable(&r_vec->tasklet); free_irq(r_vec->irq_vector, r_vec); } /** * nfp_net_rss_write_itbl() - Write RSS indirection table to device * @nn: NFP Net device to reconfigure */ void nfp_net_rss_write_itbl(struct nfp_net *nn) { int i; for (i = 0; i < NFP_NET_CFG_RSS_ITBL_SZ; i += 4) nn_writel(nn, NFP_NET_CFG_RSS_ITBL + i, get_unaligned_le32(nn->rss_itbl + i)); } /** * nfp_net_rss_write_key() - Write RSS hash key to device * @nn: NFP Net device to reconfigure */ void nfp_net_rss_write_key(struct nfp_net *nn) { int i; for (i = 0; i < nfp_net_rss_key_sz(nn); i += 4) nn_writel(nn, NFP_NET_CFG_RSS_KEY + i, get_unaligned_le32(nn->rss_key + i)); } /** * nfp_net_coalesce_write_cfg() - Write irq coalescence configuration to HW * @nn: NFP Net device to reconfigure */ void nfp_net_coalesce_write_cfg(struct nfp_net *nn) { u8 i; u32 factor; u32 value; /* Compute factor used to convert coalesce '_usecs' parameters to * ME timestamp ticks. There are 16 ME clock cycles for each timestamp * count. */ factor = nn->tlv_caps.me_freq_mhz / 16; /* copy RX interrupt coalesce parameters */ value = (nn->rx_coalesce_max_frames << 16) | (factor * nn->rx_coalesce_usecs); for (i = 0; i < nn->dp.num_rx_rings; i++) nn_writel(nn, NFP_NET_CFG_RXR_IRQ_MOD(i), value); /* copy TX interrupt coalesce parameters */ value = (nn->tx_coalesce_max_frames << 16) | (factor * nn->tx_coalesce_usecs); for (i = 0; i < nn->dp.num_tx_rings; i++) nn_writel(nn, NFP_NET_CFG_TXR_IRQ_MOD(i), value); } /** * nfp_net_write_mac_addr() - Write mac address to the device control BAR * @nn: NFP Net device to reconfigure * @addr: MAC address to write * * Writes the MAC address from the netdev to the device control BAR. Does not * perform the required reconfig. We do a bit of byte swapping dance because * firmware is LE. */ static void nfp_net_write_mac_addr(struct nfp_net *nn, const u8 *addr) { nn_writel(nn, NFP_NET_CFG_MACADDR + 0, get_unaligned_be32(addr)); nn_writew(nn, NFP_NET_CFG_MACADDR + 6, get_unaligned_be16(addr + 4)); } static void nfp_net_vec_clear_ring_data(struct nfp_net *nn, unsigned int idx) { nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(idx), 0); nn_writeb(nn, NFP_NET_CFG_RXR_SZ(idx), 0); nn_writeb(nn, NFP_NET_CFG_RXR_VEC(idx), 0); nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(idx), 0); nn_writeb(nn, NFP_NET_CFG_TXR_SZ(idx), 0); nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), 0); } /** * nfp_net_clear_config_and_disable() - Clear control BAR and disable NFP * @nn: NFP Net device to reconfigure * * Warning: must be fully idempotent. */ static void nfp_net_clear_config_and_disable(struct nfp_net *nn) { u32 new_ctrl, update; unsigned int r; int err; new_ctrl = nn->dp.ctrl; new_ctrl &= ~NFP_NET_CFG_CTRL_ENABLE; update = NFP_NET_CFG_UPDATE_GEN; update |= NFP_NET_CFG_UPDATE_MSIX; update |= NFP_NET_CFG_UPDATE_RING; if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG) new_ctrl &= ~NFP_NET_CFG_CTRL_RINGCFG; nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, 0); nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, 0); nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl); err = nfp_net_reconfig(nn, update); if (err) nn_err(nn, "Could not disable device: %d\n", err); for (r = 0; r < nn->dp.num_rx_rings; r++) nfp_net_rx_ring_reset(&nn->dp.rx_rings[r]); for (r = 0; r < nn->dp.num_tx_rings; r++) nfp_net_tx_ring_reset(&nn->dp, &nn->dp.tx_rings[r]); for (r = 0; r < nn->dp.num_r_vecs; r++) nfp_net_vec_clear_ring_data(nn, r); nn->dp.ctrl = new_ctrl; } static void nfp_net_rx_ring_hw_cfg_write(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring, unsigned int idx) { /* Write the DMA address, size and MSI-X info to the device */ nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(idx), rx_ring->dma); nn_writeb(nn, NFP_NET_CFG_RXR_SZ(idx), ilog2(rx_ring->cnt)); nn_writeb(nn, NFP_NET_CFG_RXR_VEC(idx), rx_ring->r_vec->irq_entry); } static void nfp_net_tx_ring_hw_cfg_write(struct nfp_net *nn, struct nfp_net_tx_ring *tx_ring, unsigned int idx) { nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(idx), tx_ring->dma); nn_writeb(nn, NFP_NET_CFG_TXR_SZ(idx), ilog2(tx_ring->cnt)); nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), tx_ring->r_vec->irq_entry); } /** * nfp_net_set_config_and_enable() - Write control BAR and enable NFP * @nn: NFP Net device to reconfigure */ static int nfp_net_set_config_and_enable(struct nfp_net *nn) { u32 bufsz, new_ctrl, update = 0; unsigned int r; int err; new_ctrl = nn->dp.ctrl; if (nn->dp.ctrl & NFP_NET_CFG_CTRL_RSS_ANY) { nfp_net_rss_write_key(nn); nfp_net_rss_write_itbl(nn); nn_writel(nn, NFP_NET_CFG_RSS_CTRL, nn->rss_cfg); update |= NFP_NET_CFG_UPDATE_RSS; } if (nn->dp.ctrl & NFP_NET_CFG_CTRL_IRQMOD) { nfp_net_coalesce_write_cfg(nn); update |= NFP_NET_CFG_UPDATE_IRQMOD; } for (r = 0; r < nn->dp.num_tx_rings; r++) nfp_net_tx_ring_hw_cfg_write(nn, &nn->dp.tx_rings[r], r); for (r = 0; r < nn->dp.num_rx_rings; r++) nfp_net_rx_ring_hw_cfg_write(nn, &nn->dp.rx_rings[r], r); nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, nn->dp.num_tx_rings == 64 ? 0xffffffffffffffffULL : ((u64)1 << nn->dp.num_tx_rings) - 1); nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, nn->dp.num_rx_rings == 64 ? 0xffffffffffffffffULL : ((u64)1 << nn->dp.num_rx_rings) - 1); if (nn->dp.netdev) nfp_net_write_mac_addr(nn, nn->dp.netdev->dev_addr); nn_writel(nn, NFP_NET_CFG_MTU, nn->dp.mtu); bufsz = nn->dp.fl_bufsz - nn->dp.rx_dma_off - NFP_NET_RX_BUF_NON_DATA; nn_writel(nn, NFP_NET_CFG_FLBUFSZ, bufsz); /* Enable device */ new_ctrl |= NFP_NET_CFG_CTRL_ENABLE; update |= NFP_NET_CFG_UPDATE_GEN; update |= NFP_NET_CFG_UPDATE_MSIX; update |= NFP_NET_CFG_UPDATE_RING; if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG) new_ctrl |= NFP_NET_CFG_CTRL_RINGCFG; nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl); err = nfp_net_reconfig(nn, update); if (err) { nfp_net_clear_config_and_disable(nn); return err; } nn->dp.ctrl = new_ctrl; for (r = 0; r < nn->dp.num_rx_rings; r++) nfp_net_rx_ring_fill_freelist(&nn->dp, &nn->dp.rx_rings[r]); return 0; } /** * nfp_net_close_stack() - Quiesce the stack (part of close) * @nn: NFP Net device to reconfigure */ static void nfp_net_close_stack(struct nfp_net *nn) { struct nfp_net_r_vector *r_vec; unsigned int r; disable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector); netif_carrier_off(nn->dp.netdev); nn->link_up = false; for (r = 0; r < nn->dp.num_r_vecs; r++) { r_vec = &nn->r_vecs[r]; disable_irq(r_vec->irq_vector); napi_disable(&r_vec->napi); if (r_vec->rx_ring) cancel_work_sync(&r_vec->rx_dim.work); if (r_vec->tx_ring) cancel_work_sync(&r_vec->tx_dim.work); } netif_tx_disable(nn->dp.netdev); } /** * nfp_net_close_free_all() - Free all runtime resources * @nn: NFP Net device to reconfigure */ static void nfp_net_close_free_all(struct nfp_net *nn) { unsigned int r; nfp_net_tx_rings_free(&nn->dp); nfp_net_rx_rings_free(&nn->dp); for (r = 0; r < nn->dp.num_r_vecs; r++) nfp_net_cleanup_vector(nn, &nn->r_vecs[r]); nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX); nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX); } /** * nfp_net_netdev_close() - Called when the device is downed * @netdev: netdev structure */ static int nfp_net_netdev_close(struct net_device *netdev) { struct nfp_net *nn = netdev_priv(netdev); /* Step 1: Disable RX and TX rings from the Linux kernel perspective */ nfp_net_close_stack(nn); /* Step 2: Tell NFP */ nfp_net_clear_config_and_disable(nn); nfp_port_configure(netdev, false); /* Step 3: Free resources */ nfp_net_close_free_all(nn); nn_dbg(nn, "%s down", netdev->name); return 0; } void nfp_ctrl_close(struct nfp_net *nn) { int r; rtnl_lock(); for (r = 0; r < nn->dp.num_r_vecs; r++) { disable_irq(nn->r_vecs[r].irq_vector); tasklet_disable(&nn->r_vecs[r].tasklet); } nfp_net_clear_config_and_disable(nn); nfp_net_close_free_all(nn); rtnl_unlock(); } static void nfp_net_rx_dim_work(struct work_struct *work) { struct nfp_net_r_vector *r_vec; unsigned int factor, value; struct dim_cq_moder moder; struct nfp_net *nn; struct dim *dim; dim = container_of(work, struct dim, work); moder = net_dim_get_rx_moderation(dim->mode, dim->profile_ix); r_vec = container_of(dim, struct nfp_net_r_vector, rx_dim); nn = r_vec->nfp_net; /* Compute factor used to convert coalesce '_usecs' parameters to * ME timestamp ticks. There are 16 ME clock cycles for each timestamp * count. */ factor = nn->tlv_caps.me_freq_mhz / 16; if (nfp_net_coalesce_para_check(factor * moder.usec, moder.pkts)) return; /* copy RX interrupt coalesce parameters */ value = (moder.pkts << 16) | (factor * moder.usec); rtnl_lock(); nn_writel(nn, NFP_NET_CFG_RXR_IRQ_MOD(r_vec->rx_ring->idx), value); (void)nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_IRQMOD); rtnl_unlock(); dim->state = DIM_START_MEASURE; } static void nfp_net_tx_dim_work(struct work_struct *work) { struct nfp_net_r_vector *r_vec; unsigned int factor, value; struct dim_cq_moder moder; struct nfp_net *nn; struct dim *dim; dim = container_of(work, struct dim, work); moder = net_dim_get_tx_moderation(dim->mode, dim->profile_ix); r_vec = container_of(dim, struct nfp_net_r_vector, tx_dim); nn = r_vec->nfp_net; /* Compute factor used to convert coalesce '_usecs' parameters to * ME timestamp ticks. There are 16 ME clock cycles for each timestamp * count. */ factor = nn->tlv_caps.me_freq_mhz / 16; if (nfp_net_coalesce_para_check(factor * moder.usec, moder.pkts)) return; /* copy TX interrupt coalesce parameters */ value = (moder.pkts << 16) | (factor * moder.usec); rtnl_lock(); nn_writel(nn, NFP_NET_CFG_TXR_IRQ_MOD(r_vec->tx_ring->idx), value); (void)nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_IRQMOD); rtnl_unlock(); dim->state = DIM_START_MEASURE; } /** * nfp_net_open_stack() - Start the device from stack's perspective * @nn: NFP Net device to reconfigure */ static void nfp_net_open_stack(struct nfp_net *nn) { struct nfp_net_r_vector *r_vec; unsigned int r; for (r = 0; r < nn->dp.num_r_vecs; r++) { r_vec = &nn->r_vecs[r]; if (r_vec->rx_ring) { INIT_WORK(&r_vec->rx_dim.work, nfp_net_rx_dim_work); r_vec->rx_dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE; } if (r_vec->tx_ring) { INIT_WORK(&r_vec->tx_dim.work, nfp_net_tx_dim_work); r_vec->tx_dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE; } napi_enable(&r_vec->napi); enable_irq(r_vec->irq_vector); } netif_tx_wake_all_queues(nn->dp.netdev); enable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector); nfp_net_read_link_status(nn); } static int nfp_net_open_alloc_all(struct nfp_net *nn) { int err, r; err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_EXN, "%s-exn", nn->exn_name, sizeof(nn->exn_name), NFP_NET_IRQ_EXN_IDX, nn->exn_handler); if (err) return err; err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_LSC, "%s-lsc", nn->lsc_name, sizeof(nn->lsc_name), NFP_NET_IRQ_LSC_IDX, nn->lsc_handler); if (err) goto err_free_exn; disable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector); for (r = 0; r < nn->dp.num_r_vecs; r++) { err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r); if (err) goto err_cleanup_vec_p; } err = nfp_net_rx_rings_prepare(nn, &nn->dp); if (err) goto err_cleanup_vec; err = nfp_net_tx_rings_prepare(nn, &nn->dp); if (err) goto err_free_rx_rings; for (r = 0; r < nn->max_r_vecs; r++) nfp_net_vector_assign_rings(&nn->dp, &nn->r_vecs[r], r); return 0; err_free_rx_rings: nfp_net_rx_rings_free(&nn->dp); err_cleanup_vec: r = nn->dp.num_r_vecs; err_cleanup_vec_p: while (r--) nfp_net_cleanup_vector(nn, &nn->r_vecs[r]); nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX); err_free_exn: nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX); return err; } static int nfp_net_netdev_open(struct net_device *netdev) { struct nfp_net *nn = netdev_priv(netdev); int err; /* Step 1: Allocate resources for rings and the like * - Request interrupts * - Allocate RX and TX ring resources * - Setup initial RSS table */ err = nfp_net_open_alloc_all(nn); if (err) return err; err = netif_set_real_num_tx_queues(netdev, nn->dp.num_stack_tx_rings); if (err) goto err_free_all; err = netif_set_real_num_rx_queues(netdev, nn->dp.num_rx_rings); if (err) goto err_free_all; /* Step 2: Configure the NFP * - Ifup the physical interface if it exists * - Enable rings from 0 to tx_rings/rx_rings - 1. * - Write MAC address (in case it changed) * - Set the MTU * - Set the Freelist buffer size * - Enable the FW */ err = nfp_port_configure(netdev, true); if (err) goto err_free_all; err = nfp_net_set_config_and_enable(nn); if (err) goto err_port_disable; /* Step 3: Enable for kernel * - put some freelist descriptors on each RX ring * - enable NAPI on each ring * - enable all TX queues * - set link state */ nfp_net_open_stack(nn); return 0; err_port_disable: nfp_port_configure(netdev, false); err_free_all: nfp_net_close_free_all(nn); return err; } int nfp_ctrl_open(struct nfp_net *nn) { int err, r; /* ring dumping depends on vNICs being opened/closed under rtnl */ rtnl_lock(); err = nfp_net_open_alloc_all(nn); if (err) goto err_unlock; err = nfp_net_set_config_and_enable(nn); if (err) goto err_free_all; for (r = 0; r < nn->dp.num_r_vecs; r++) enable_irq(nn->r_vecs[r].irq_vector); rtnl_unlock(); return 0; err_free_all: nfp_net_close_free_all(nn); err_unlock: rtnl_unlock(); return err; } static void nfp_net_set_rx_mode(struct net_device *netdev) { struct nfp_net *nn = netdev_priv(netdev); u32 new_ctrl; new_ctrl = nn->dp.ctrl; if (!netdev_mc_empty(netdev) || netdev->flags & IFF_ALLMULTI) new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_L2MC; else new_ctrl &= ~NFP_NET_CFG_CTRL_L2MC; if (netdev->flags & IFF_PROMISC) { if (nn->cap & NFP_NET_CFG_CTRL_PROMISC) new_ctrl |= NFP_NET_CFG_CTRL_PROMISC; else nn_warn(nn, "FW does not support promiscuous mode\n"); } else { new_ctrl &= ~NFP_NET_CFG_CTRL_PROMISC; } if (new_ctrl == nn->dp.ctrl) return; nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl); nfp_net_reconfig_post(nn, NFP_NET_CFG_UPDATE_GEN); nn->dp.ctrl = new_ctrl; } static void nfp_net_rss_init_itbl(struct nfp_net *nn) { int i; for (i = 0; i < sizeof(nn->rss_itbl); i++) nn->rss_itbl[i] = ethtool_rxfh_indir_default(i, nn->dp.num_rx_rings); } static void nfp_net_dp_swap(struct nfp_net *nn, struct nfp_net_dp *dp) { struct nfp_net_dp new_dp = *dp; *dp = nn->dp; nn->dp = new_dp; nn->dp.netdev->mtu = new_dp.mtu; if (!netif_is_rxfh_configured(nn->dp.netdev)) nfp_net_rss_init_itbl(nn); } static int nfp_net_dp_swap_enable(struct nfp_net *nn, struct nfp_net_dp *dp) { unsigned int r; int err; nfp_net_dp_swap(nn, dp); for (r = 0; r < nn->max_r_vecs; r++) nfp_net_vector_assign_rings(&nn->dp, &nn->r_vecs[r], r); err = netif_set_real_num_queues(nn->dp.netdev, nn->dp.num_stack_tx_rings, nn->dp.num_rx_rings); if (err) return err; return nfp_net_set_config_and_enable(nn); } struct nfp_net_dp *nfp_net_clone_dp(struct nfp_net *nn) { struct nfp_net_dp *new; new = kmalloc(sizeof(*new), GFP_KERNEL); if (!new) return NULL; *new = nn->dp; /* Clear things which need to be recomputed */ new->fl_bufsz = 0; new->tx_rings = NULL; new->rx_rings = NULL; new->num_r_vecs = 0; new->num_stack_tx_rings = 0; return new; } static int nfp_net_check_config(struct nfp_net *nn, struct nfp_net_dp *dp, struct netlink_ext_ack *extack) { /* XDP-enabled tests */ if (!dp->xdp_prog) return 0; if (dp->fl_bufsz > PAGE_SIZE) { NL_SET_ERR_MSG_MOD(extack, "MTU too large w/ XDP enabled"); return -EINVAL; } if (dp->num_tx_rings > nn->max_tx_rings) { NL_SET_ERR_MSG_MOD(extack, "Insufficient number of TX rings w/ XDP enabled"); return -EINVAL; } return 0; } int nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *dp, struct netlink_ext_ack *extack) { int r, err; dp->fl_bufsz = nfp_net_calc_fl_bufsz(dp); dp->num_stack_tx_rings = dp->num_tx_rings; if (dp->xdp_prog) dp->num_stack_tx_rings -= dp->num_rx_rings; dp->num_r_vecs = max(dp->num_rx_rings, dp->num_stack_tx_rings); err = nfp_net_check_config(nn, dp, extack); if (err) goto exit_free_dp; if (!netif_running(dp->netdev)) { nfp_net_dp_swap(nn, dp); err = 0; goto exit_free_dp; } /* Prepare new rings */ for (r = nn->dp.num_r_vecs; r < dp->num_r_vecs; r++) { err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r); if (err) { dp->num_r_vecs = r; goto err_cleanup_vecs; } } err = nfp_net_rx_rings_prepare(nn, dp); if (err) goto err_cleanup_vecs; err = nfp_net_tx_rings_prepare(nn, dp); if (err) goto err_free_rx; /* Stop device, swap in new rings, try to start the firmware */ nfp_net_close_stack(nn); nfp_net_clear_config_and_disable(nn); err = nfp_net_dp_swap_enable(nn, dp); if (err) { int err2; nfp_net_clear_config_and_disable(nn); /* Try with old configuration and old rings */ err2 = nfp_net_dp_swap_enable(nn, dp); if (err2) nn_err(nn, "Can't restore ring config - FW communication failed (%d,%d)\n", err, err2); } for (r = dp->num_r_vecs - 1; r >= nn->dp.num_r_vecs; r--) nfp_net_cleanup_vector(nn, &nn->r_vecs[r]); nfp_net_rx_rings_free(dp); nfp_net_tx_rings_free(dp); nfp_net_open_stack(nn); exit_free_dp: kfree(dp); return err; err_free_rx: nfp_net_rx_rings_free(dp); err_cleanup_vecs: for (r = dp->num_r_vecs - 1; r >= nn->dp.num_r_vecs; r--) nfp_net_cleanup_vector(nn, &nn->r_vecs[r]); kfree(dp); return err; } static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu) { struct nfp_net *nn = netdev_priv(netdev); struct nfp_net_dp *dp; int err; err = nfp_app_check_mtu(nn->app, netdev, new_mtu); if (err) return err; dp = nfp_net_clone_dp(nn); if (!dp) return -ENOMEM; dp->mtu = new_mtu; return nfp_net_ring_reconfig(nn, dp, NULL); } static int nfp_net_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid) { const u32 cmd = NFP_NET_CFG_MBOX_CMD_CTAG_FILTER_ADD; struct nfp_net *nn = netdev_priv(netdev); int err; /* Priority tagged packets with vlan id 0 are processed by the * NFP as untagged packets */ if (!vid) return 0; err = nfp_net_mbox_lock(nn, NFP_NET_CFG_VLAN_FILTER_SZ); if (err) return err; nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_VLAN_FILTER_VID, vid); nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_VLAN_FILTER_PROTO, ETH_P_8021Q); return nfp_net_mbox_reconfig_and_unlock(nn, cmd); } static int nfp_net_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid) { const u32 cmd = NFP_NET_CFG_MBOX_CMD_CTAG_FILTER_KILL; struct nfp_net *nn = netdev_priv(netdev); int err; /* Priority tagged packets with vlan id 0 are processed by the * NFP as untagged packets */ if (!vid) return 0; err = nfp_net_mbox_lock(nn, NFP_NET_CFG_VLAN_FILTER_SZ); if (err) return err; nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_VLAN_FILTER_VID, vid); nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_VLAN_FILTER_PROTO, ETH_P_8021Q); return nfp_net_mbox_reconfig_and_unlock(nn, cmd); } static void nfp_net_stat64(struct net_device *netdev, struct rtnl_link_stats64 *stats) { struct nfp_net *nn = netdev_priv(netdev); int r; /* Collect software stats */ for (r = 0; r < nn->max_r_vecs; r++) { struct nfp_net_r_vector *r_vec = &nn->r_vecs[r]; u64 data[3]; unsigned int start; do { start = u64_stats_fetch_begin(&r_vec->rx_sync); data[0] = r_vec->rx_pkts; data[1] = r_vec->rx_bytes; data[2] = r_vec->rx_drops; } while (u64_stats_fetch_retry(&r_vec->rx_sync, start)); stats->rx_packets += data[0]; stats->rx_bytes += data[1]; stats->rx_dropped += data[2]; do { start = u64_stats_fetch_begin(&r_vec->tx_sync); data[0] = r_vec->tx_pkts; data[1] = r_vec->tx_bytes; data[2] = r_vec->tx_errors; } while (u64_stats_fetch_retry(&r_vec->tx_sync, start)); stats->tx_packets += data[0]; stats->tx_bytes += data[1]; stats->tx_errors += data[2]; } /* Add in device stats */ stats->multicast += nn_readq(nn, NFP_NET_CFG_STATS_RX_MC_FRAMES); stats->rx_dropped += nn_readq(nn, NFP_NET_CFG_STATS_RX_DISCARDS); stats->rx_errors += nn_readq(nn, NFP_NET_CFG_STATS_RX_ERRORS); stats->tx_dropped += nn_readq(nn, NFP_NET_CFG_STATS_TX_DISCARDS); stats->tx_errors += nn_readq(nn, NFP_NET_CFG_STATS_TX_ERRORS); } static int nfp_net_set_features(struct net_device *netdev, netdev_features_t features) { netdev_features_t changed = netdev->features ^ features; struct nfp_net *nn = netdev_priv(netdev); u32 new_ctrl; int err; /* Assume this is not called with features we have not advertised */ new_ctrl = nn->dp.ctrl; if (changed & NETIF_F_RXCSUM) { if (features & NETIF_F_RXCSUM) new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_RXCSUM_ANY; else new_ctrl &= ~NFP_NET_CFG_CTRL_RXCSUM_ANY; } if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) { if (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) new_ctrl |= NFP_NET_CFG_CTRL_TXCSUM; else new_ctrl &= ~NFP_NET_CFG_CTRL_TXCSUM; } if (changed & (NETIF_F_TSO | NETIF_F_TSO6)) { if (features & (NETIF_F_TSO | NETIF_F_TSO6)) new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_LSO2 ?: NFP_NET_CFG_CTRL_LSO; else new_ctrl &= ~NFP_NET_CFG_CTRL_LSO_ANY; } if (changed & NETIF_F_HW_VLAN_CTAG_RX) { if (features & NETIF_F_HW_VLAN_CTAG_RX) new_ctrl |= NFP_NET_CFG_CTRL_RXVLAN; else new_ctrl &= ~NFP_NET_CFG_CTRL_RXVLAN; } if (changed & NETIF_F_HW_VLAN_CTAG_TX) { if (features & NETIF_F_HW_VLAN_CTAG_TX) new_ctrl |= NFP_NET_CFG_CTRL_TXVLAN; else new_ctrl &= ~NFP_NET_CFG_CTRL_TXVLAN; } if (changed & NETIF_F_HW_VLAN_CTAG_FILTER) { if (features & NETIF_F_HW_VLAN_CTAG_FILTER) new_ctrl |= NFP_NET_CFG_CTRL_CTAG_FILTER; else new_ctrl &= ~NFP_NET_CFG_CTRL_CTAG_FILTER; } if (changed & NETIF_F_SG) { if (features & NETIF_F_SG) new_ctrl |= NFP_NET_CFG_CTRL_GATHER; else new_ctrl &= ~NFP_NET_CFG_CTRL_GATHER; } err = nfp_port_set_features(netdev, features); if (err) return err; nn_dbg(nn, "Feature change 0x%llx -> 0x%llx (changed=0x%llx)\n", netdev->features, features, changed); if (new_ctrl == nn->dp.ctrl) return 0; nn_dbg(nn, "NIC ctrl: 0x%x -> 0x%x\n", nn->dp.ctrl, new_ctrl); nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl); err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_GEN); if (err) return err; nn->dp.ctrl = new_ctrl; return 0; } static netdev_features_t nfp_net_features_check(struct sk_buff *skb, struct net_device *dev, netdev_features_t features) { u8 l4_hdr; /* We can't do TSO over double tagged packets (802.1AD) */ features &= vlan_features_check(skb, features); if (!skb->encapsulation) return features; /* Ensure that inner L4 header offset fits into TX descriptor field */ if (skb_is_gso(skb)) { u32 hdrlen; hdrlen = skb_inner_transport_header(skb) - skb->data + inner_tcp_hdrlen(skb); /* Assume worst case scenario of having longest possible * metadata prepend - 8B */ if (unlikely(hdrlen > NFP_NET_LSO_MAX_HDR_SZ - 8)) features &= ~NETIF_F_GSO_MASK; } /* VXLAN/GRE check */ switch (vlan_get_protocol(skb)) { case htons(ETH_P_IP): l4_hdr = ip_hdr(skb)->protocol; break; case htons(ETH_P_IPV6): l4_hdr = ipv6_hdr(skb)->nexthdr; break; default: return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); } if (skb->inner_protocol_type != ENCAP_TYPE_ETHER || skb->inner_protocol != htons(ETH_P_TEB) || (l4_hdr != IPPROTO_UDP && l4_hdr != IPPROTO_GRE) || (l4_hdr == IPPROTO_UDP && (skb_inner_mac_header(skb) - skb_transport_header(skb) != sizeof(struct udphdr) + sizeof(struct vxlanhdr)))) return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); return features; } static int nfp_net_get_phys_port_name(struct net_device *netdev, char *name, size_t len) { struct nfp_net *nn = netdev_priv(netdev); int n; /* If port is defined, devlink_port is registered and devlink core * is taking care of name formatting. */ if (nn->port) return -EOPNOTSUPP; if (nn->dp.is_vf || nn->vnic_no_name) return -EOPNOTSUPP; n = snprintf(name, len, "n%d", nn->id); if (n >= len) return -EINVAL; return 0; } static int nfp_net_xdp_setup_drv(struct nfp_net *nn, struct netdev_bpf *bpf) { struct bpf_prog *prog = bpf->prog; struct nfp_net_dp *dp; int err; if (!prog == !nn->dp.xdp_prog) { WRITE_ONCE(nn->dp.xdp_prog, prog); xdp_attachment_setup(&nn->xdp, bpf); return 0; } dp = nfp_net_clone_dp(nn); if (!dp) return -ENOMEM; dp->xdp_prog = prog; dp->num_tx_rings += prog ? nn->dp.num_rx_rings : -nn->dp.num_rx_rings; dp->rx_dma_dir = prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE; dp->rx_dma_off = prog ? XDP_PACKET_HEADROOM - nn->dp.rx_offset : 0; /* We need RX reconfig to remap the buffers (BIDIR vs FROM_DEV) */ err = nfp_net_ring_reconfig(nn, dp, bpf->extack); if (err) return err; xdp_attachment_setup(&nn->xdp, bpf); return 0; } static int nfp_net_xdp_setup_hw(struct nfp_net *nn, struct netdev_bpf *bpf) { int err; err = nfp_app_xdp_offload(nn->app, nn, bpf->prog, bpf->extack); if (err) return err; xdp_attachment_setup(&nn->xdp_hw, bpf); return 0; } static int nfp_net_xdp(struct net_device *netdev, struct netdev_bpf *xdp) { struct nfp_net *nn = netdev_priv(netdev); switch (xdp->command) { case XDP_SETUP_PROG: return nfp_net_xdp_setup_drv(nn, xdp); case XDP_SETUP_PROG_HW: return nfp_net_xdp_setup_hw(nn, xdp); default: return nfp_app_bpf(nn->app, nn, xdp); } } static int nfp_net_set_mac_address(struct net_device *netdev, void *addr) { struct nfp_net *nn = netdev_priv(netdev); struct sockaddr *saddr = addr; int err; err = eth_prepare_mac_addr_change(netdev, addr); if (err) return err; nfp_net_write_mac_addr(nn, saddr->sa_data); err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_MACADDR); if (err) return err; eth_commit_mac_addr_change(netdev, addr); return 0; } const struct net_device_ops nfp_net_netdev_ops = { .ndo_init = nfp_app_ndo_init, .ndo_uninit = nfp_app_ndo_uninit, .ndo_open = nfp_net_netdev_open, .ndo_stop = nfp_net_netdev_close, .ndo_start_xmit = nfp_net_tx, .ndo_get_stats64 = nfp_net_stat64, .ndo_vlan_rx_add_vid = nfp_net_vlan_rx_add_vid, .ndo_vlan_rx_kill_vid = nfp_net_vlan_rx_kill_vid, .ndo_set_vf_mac = nfp_app_set_vf_mac, .ndo_set_vf_vlan = nfp_app_set_vf_vlan, .ndo_set_vf_spoofchk = nfp_app_set_vf_spoofchk, .ndo_set_vf_trust = nfp_app_set_vf_trust, .ndo_get_vf_config = nfp_app_get_vf_config, .ndo_set_vf_link_state = nfp_app_set_vf_link_state, .ndo_setup_tc = nfp_port_setup_tc, .ndo_tx_timeout = nfp_net_tx_timeout, .ndo_set_rx_mode = nfp_net_set_rx_mode, .ndo_change_mtu = nfp_net_change_mtu, .ndo_set_mac_address = nfp_net_set_mac_address, .ndo_set_features = nfp_net_set_features, .ndo_features_check = nfp_net_features_check, .ndo_get_phys_port_name = nfp_net_get_phys_port_name, .ndo_bpf = nfp_net_xdp, .ndo_get_devlink_port = nfp_devlink_get_devlink_port, }; static int nfp_udp_tunnel_sync(struct net_device *netdev, unsigned int table) { struct nfp_net *nn = netdev_priv(netdev); int i; BUILD_BUG_ON(NFP_NET_N_VXLAN_PORTS & 1); for (i = 0; i < NFP_NET_N_VXLAN_PORTS; i += 2) { struct udp_tunnel_info ti0, ti1; udp_tunnel_nic_get_port(netdev, table, i, &ti0); udp_tunnel_nic_get_port(netdev, table, i + 1, &ti1); nn_writel(nn, NFP_NET_CFG_VXLAN_PORT + i * sizeof(ti0.port), be16_to_cpu(ti1.port) << 16 | be16_to_cpu(ti0.port)); } return nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_VXLAN); } static const struct udp_tunnel_nic_info nfp_udp_tunnels = { .sync_table = nfp_udp_tunnel_sync, .flags = UDP_TUNNEL_NIC_INFO_MAY_SLEEP | UDP_TUNNEL_NIC_INFO_OPEN_ONLY, .tables = { { .n_entries = NFP_NET_N_VXLAN_PORTS, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, }, }, }; /** * nfp_net_info() - Print general info about the NIC * @nn: NFP Net device to reconfigure */ void nfp_net_info(struct nfp_net *nn) { nn_info(nn, "Netronome NFP-6xxx %sNetdev: TxQs=%d/%d RxQs=%d/%d\n", nn->dp.is_vf ? "VF " : "", nn->dp.num_tx_rings, nn->max_tx_rings, nn->dp.num_rx_rings, nn->max_rx_rings); nn_info(nn, "VER: %d.%d.%d.%d, Maximum supported MTU: %d\n", nn->fw_ver.resv, nn->fw_ver.class, nn->fw_ver.major, nn->fw_ver.minor, nn->max_mtu); nn_info(nn, "CAP: %#x %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n", nn->cap, nn->cap & NFP_NET_CFG_CTRL_PROMISC ? "PROMISC " : "", nn->cap & NFP_NET_CFG_CTRL_L2BC ? "L2BCFILT " : "", nn->cap & NFP_NET_CFG_CTRL_L2MC ? "L2MCFILT " : "", nn->cap & NFP_NET_CFG_CTRL_RXCSUM ? "RXCSUM " : "", nn->cap & NFP_NET_CFG_CTRL_TXCSUM ? "TXCSUM " : "", nn->cap & NFP_NET_CFG_CTRL_RXVLAN ? "RXVLAN " : "", nn->cap & NFP_NET_CFG_CTRL_TXVLAN ? "TXVLAN " : "", nn->cap & NFP_NET_CFG_CTRL_SCATTER ? "SCATTER " : "", nn->cap & NFP_NET_CFG_CTRL_GATHER ? "GATHER " : "", nn->cap & NFP_NET_CFG_CTRL_LSO ? "TSO1 " : "", nn->cap & NFP_NET_CFG_CTRL_LSO2 ? "TSO2 " : "", nn->cap & NFP_NET_CFG_CTRL_RSS ? "RSS1 " : "", nn->cap & NFP_NET_CFG_CTRL_RSS2 ? "RSS2 " : "", nn->cap & NFP_NET_CFG_CTRL_CTAG_FILTER ? "CTAG_FILTER " : "", nn->cap & NFP_NET_CFG_CTRL_MSIXAUTO ? "AUTOMASK " : "", nn->cap & NFP_NET_CFG_CTRL_IRQMOD ? "IRQMOD " : "", nn->cap & NFP_NET_CFG_CTRL_VXLAN ? "VXLAN " : "", nn->cap & NFP_NET_CFG_CTRL_NVGRE ? "NVGRE " : "", nn->cap & NFP_NET_CFG_CTRL_CSUM_COMPLETE ? "RXCSUM_COMPLETE " : "", nn->cap & NFP_NET_CFG_CTRL_LIVE_ADDR ? "LIVE_ADDR " : "", nfp_app_extra_cap(nn->app, nn)); } /** * nfp_net_alloc() - Allocate netdev and related structure * @pdev: PCI device * @ctrl_bar: PCI IOMEM with vNIC config memory * @needs_netdev: Whether to allocate a netdev for this vNIC * @max_tx_rings: Maximum number of TX rings supported by device * @max_rx_rings: Maximum number of RX rings supported by device * * This function allocates a netdev device and fills in the initial * part of the @struct nfp_net structure. In case of control device * nfp_net structure is allocated without the netdev. * * Return: NFP Net device structure, or ERR_PTR on error. */ struct nfp_net * nfp_net_alloc(struct pci_dev *pdev, void __iomem *ctrl_bar, bool needs_netdev, unsigned int max_tx_rings, unsigned int max_rx_rings) { struct nfp_net *nn; int err; if (needs_netdev) { struct net_device *netdev; netdev = alloc_etherdev_mqs(sizeof(struct nfp_net), max_tx_rings, max_rx_rings); if (!netdev) return ERR_PTR(-ENOMEM); SET_NETDEV_DEV(netdev, &pdev->dev); nn = netdev_priv(netdev); nn->dp.netdev = netdev; } else { nn = vzalloc(sizeof(*nn)); if (!nn) return ERR_PTR(-ENOMEM); } nn->dp.dev = &pdev->dev; nn->dp.ctrl_bar = ctrl_bar; nn->pdev = pdev; nn->max_tx_rings = max_tx_rings; nn->max_rx_rings = max_rx_rings; nn->dp.num_tx_rings = min_t(unsigned int, max_tx_rings, num_online_cpus()); nn->dp.num_rx_rings = min_t(unsigned int, max_rx_rings, netif_get_num_default_rss_queues()); nn->dp.num_r_vecs = max(nn->dp.num_tx_rings, nn->dp.num_rx_rings); nn->dp.num_r_vecs = min_t(unsigned int, nn->dp.num_r_vecs, num_online_cpus()); nn->dp.txd_cnt = NFP_NET_TX_DESCS_DEFAULT; nn->dp.rxd_cnt = NFP_NET_RX_DESCS_DEFAULT; sema_init(&nn->bar_lock, 1); spin_lock_init(&nn->reconfig_lock); spin_lock_init(&nn->link_status_lock); timer_setup(&nn->reconfig_timer, nfp_net_reconfig_timer, 0); err = nfp_net_tlv_caps_parse(&nn->pdev->dev, nn->dp.ctrl_bar, &nn->tlv_caps); if (err) goto err_free_nn; err = nfp_ccm_mbox_alloc(nn); if (err) goto err_free_nn; return nn; err_free_nn: if (nn->dp.netdev) free_netdev(nn->dp.netdev); else vfree(nn); return ERR_PTR(err); } /** * nfp_net_free() - Undo what @nfp_net_alloc() did * @nn: NFP Net device to reconfigure */ void nfp_net_free(struct nfp_net *nn) { WARN_ON(timer_pending(&nn->reconfig_timer) || nn->reconfig_posted); nfp_ccm_mbox_free(nn); if (nn->dp.netdev) free_netdev(nn->dp.netdev); else vfree(nn); } /** * nfp_net_rss_key_sz() - Get current size of the RSS key * @nn: NFP Net device instance * * Return: size of the RSS key for currently selected hash function. */ unsigned int nfp_net_rss_key_sz(struct nfp_net *nn) { switch (nn->rss_hfunc) { case ETH_RSS_HASH_TOP: return NFP_NET_CFG_RSS_KEY_SZ; case ETH_RSS_HASH_XOR: return 0; case ETH_RSS_HASH_CRC32: return 4; } nn_warn(nn, "Unknown hash function: %u\n", nn->rss_hfunc); return 0; } /** * nfp_net_rss_init() - Set the initial RSS parameters * @nn: NFP Net device to reconfigure */ static void nfp_net_rss_init(struct nfp_net *nn) { unsigned long func_bit, rss_cap_hfunc; u32 reg; /* Read the RSS function capability and select first supported func */ reg = nn_readl(nn, NFP_NET_CFG_RSS_CAP); rss_cap_hfunc = FIELD_GET(NFP_NET_CFG_RSS_CAP_HFUNC, reg); if (!rss_cap_hfunc) rss_cap_hfunc = FIELD_GET(NFP_NET_CFG_RSS_CAP_HFUNC, NFP_NET_CFG_RSS_TOEPLITZ); func_bit = find_first_bit(&rss_cap_hfunc, NFP_NET_CFG_RSS_HFUNCS); if (func_bit == NFP_NET_CFG_RSS_HFUNCS) { dev_warn(nn->dp.dev, "Bad RSS config, defaulting to Toeplitz hash\n"); func_bit = ETH_RSS_HASH_TOP_BIT; } nn->rss_hfunc = 1 << func_bit; netdev_rss_key_fill(nn->rss_key, nfp_net_rss_key_sz(nn)); nfp_net_rss_init_itbl(nn); /* Enable IPv4/IPv6 TCP by default */ nn->rss_cfg = NFP_NET_CFG_RSS_IPV4_TCP | NFP_NET_CFG_RSS_IPV6_TCP | FIELD_PREP(NFP_NET_CFG_RSS_HFUNC, nn->rss_hfunc) | NFP_NET_CFG_RSS_MASK; } /** * nfp_net_irqmod_init() - Set the initial IRQ moderation parameters * @nn: NFP Net device to reconfigure */ static void nfp_net_irqmod_init(struct nfp_net *nn) { nn->rx_coalesce_usecs = 50; nn->rx_coalesce_max_frames = 64; nn->tx_coalesce_usecs = 50; nn->tx_coalesce_max_frames = 64; nn->rx_coalesce_adapt_on = true; nn->tx_coalesce_adapt_on = true; } static void nfp_net_netdev_init(struct nfp_net *nn) { struct net_device *netdev = nn->dp.netdev; nfp_net_write_mac_addr(nn, nn->dp.netdev->dev_addr); netdev->mtu = nn->dp.mtu; /* Advertise/enable offloads based on capabilities * * Note: netdev->features show the currently enabled features * and netdev->hw_features advertises which features are * supported. By default we enable most features. */ if (nn->cap & NFP_NET_CFG_CTRL_LIVE_ADDR) netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE; netdev->hw_features = NETIF_F_HIGHDMA; if (nn->cap & NFP_NET_CFG_CTRL_RXCSUM_ANY) { netdev->hw_features |= NETIF_F_RXCSUM; nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_RXCSUM_ANY; } if (nn->cap & NFP_NET_CFG_CTRL_TXCSUM) { netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; nn->dp.ctrl |= NFP_NET_CFG_CTRL_TXCSUM; } if (nn->cap & NFP_NET_CFG_CTRL_GATHER) { netdev->hw_features |= NETIF_F_SG; nn->dp.ctrl |= NFP_NET_CFG_CTRL_GATHER; } if ((nn->cap & NFP_NET_CFG_CTRL_LSO && nn->fw_ver.major > 2) || nn->cap & NFP_NET_CFG_CTRL_LSO2) { netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6; nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_LSO2 ?: NFP_NET_CFG_CTRL_LSO; } if (nn->cap & NFP_NET_CFG_CTRL_RSS_ANY) netdev->hw_features |= NETIF_F_RXHASH; if (nn->cap & NFP_NET_CFG_CTRL_VXLAN) { if (nn->cap & NFP_NET_CFG_CTRL_LSO) netdev->hw_features |= NETIF_F_GSO_UDP_TUNNEL; netdev->udp_tunnel_nic_info = &nfp_udp_tunnels; nn->dp.ctrl |= NFP_NET_CFG_CTRL_VXLAN; } if (nn->cap & NFP_NET_CFG_CTRL_NVGRE) { if (nn->cap & NFP_NET_CFG_CTRL_LSO) netdev->hw_features |= NETIF_F_GSO_GRE; nn->dp.ctrl |= NFP_NET_CFG_CTRL_NVGRE; } if (nn->cap & (NFP_NET_CFG_CTRL_VXLAN | NFP_NET_CFG_CTRL_NVGRE)) netdev->hw_enc_features = netdev->hw_features; netdev->vlan_features = netdev->hw_features; if (nn->cap & NFP_NET_CFG_CTRL_RXVLAN) { netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX; nn->dp.ctrl |= NFP_NET_CFG_CTRL_RXVLAN; } if (nn->cap & NFP_NET_CFG_CTRL_TXVLAN) { if (nn->cap & NFP_NET_CFG_CTRL_LSO2) { nn_warn(nn, "Device advertises both TSO2 and TXVLAN. Refusing to enable TXVLAN.\n"); } else { netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX; nn->dp.ctrl |= NFP_NET_CFG_CTRL_TXVLAN; } } if (nn->cap & NFP_NET_CFG_CTRL_CTAG_FILTER) { netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER; nn->dp.ctrl |= NFP_NET_CFG_CTRL_CTAG_FILTER; } netdev->features = netdev->hw_features; if (nfp_app_has_tc(nn->app) && nn->port) netdev->hw_features |= NETIF_F_HW_TC; /* Advertise but disable TSO by default. */ netdev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6); nn->dp.ctrl &= ~NFP_NET_CFG_CTRL_LSO_ANY; /* Finalise the netdev setup */ netdev->netdev_ops = &nfp_net_netdev_ops; netdev->watchdog_timeo = msecs_to_jiffies(5 * 1000); /* MTU range: 68 - hw-specific max */ netdev->min_mtu = ETH_MIN_MTU; netdev->max_mtu = nn->max_mtu; netdev->gso_max_segs = NFP_NET_LSO_MAX_SEGS; netif_carrier_off(netdev); nfp_net_set_ethtool_ops(netdev); } static int nfp_net_read_caps(struct nfp_net *nn) { /* Get some of the read-only fields from the BAR */ nn->cap = nn_readl(nn, NFP_NET_CFG_CAP); nn->max_mtu = nn_readl(nn, NFP_NET_CFG_MAX_MTU); /* ABI 4.x and ctrl vNIC always use chained metadata, in other cases * we allow use of non-chained metadata if RSS(v1) is the only * advertised capability requiring metadata. */ nn->dp.chained_metadata_format = nn->fw_ver.major == 4 || !nn->dp.netdev || !(nn->cap & NFP_NET_CFG_CTRL_RSS) || nn->cap & NFP_NET_CFG_CTRL_CHAIN_META; /* RSS(v1) uses non-chained metadata format, except in ABI 4.x where * it has the same meaning as RSSv2. */ if (nn->dp.chained_metadata_format && nn->fw_ver.major != 4) nn->cap &= ~NFP_NET_CFG_CTRL_RSS; /* Determine RX packet/metadata boundary offset */ if (nn->fw_ver.major >= 2) { u32 reg; reg = nn_readl(nn, NFP_NET_CFG_RX_OFFSET); if (reg > NFP_NET_MAX_PREPEND) { nn_err(nn, "Invalid rx offset: %d\n", reg); return -EINVAL; } nn->dp.rx_offset = reg; } else { nn->dp.rx_offset = NFP_NET_RX_OFFSET; } /* For control vNICs mask out the capabilities app doesn't want. */ if (!nn->dp.netdev) nn->cap &= nn->app->type->ctrl_cap_mask; return 0; } /** * nfp_net_init() - Initialise/finalise the nfp_net structure * @nn: NFP Net device structure * * Return: 0 on success or negative errno on error. */ int nfp_net_init(struct nfp_net *nn) { int err; nn->dp.rx_dma_dir = DMA_FROM_DEVICE; err = nfp_net_read_caps(nn); if (err) return err; /* Set default MTU and Freelist buffer size */ if (!nfp_net_is_data_vnic(nn) && nn->app->ctrl_mtu) { nn->dp.mtu = min(nn->app->ctrl_mtu, nn->max_mtu); } else if (nn->max_mtu < NFP_NET_DEFAULT_MTU) { nn->dp.mtu = nn->max_mtu; } else { nn->dp.mtu = NFP_NET_DEFAULT_MTU; } nn->dp.fl_bufsz = nfp_net_calc_fl_bufsz(&nn->dp); if (nfp_app_ctrl_uses_data_vnics(nn->app)) nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_CMSG_DATA; if (nn->cap & NFP_NET_CFG_CTRL_RSS_ANY) { nfp_net_rss_init(nn); nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_RSS2 ?: NFP_NET_CFG_CTRL_RSS; } /* Allow L2 Broadcast and Multicast through by default, if supported */ if (nn->cap & NFP_NET_CFG_CTRL_L2BC) nn->dp.ctrl |= NFP_NET_CFG_CTRL_L2BC; /* Allow IRQ moderation, if supported */ if (nn->cap & NFP_NET_CFG_CTRL_IRQMOD) { nfp_net_irqmod_init(nn); nn->dp.ctrl |= NFP_NET_CFG_CTRL_IRQMOD; } /* Stash the re-configuration queue away. First odd queue in TX Bar */ nn->qcp_cfg = nn->tx_bar + NFP_QCP_QUEUE_ADDR_SZ; /* Make sure the FW knows the netdev is supposed to be disabled here */ nn_writel(nn, NFP_NET_CFG_CTRL, 0); nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, 0); nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, 0); err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_RING | NFP_NET_CFG_UPDATE_GEN); if (err) return err; if (nn->dp.netdev) { nfp_net_netdev_init(nn); err = nfp_ccm_mbox_init(nn); if (err) return err; err = nfp_net_tls_init(nn); if (err) goto err_clean_mbox; } nfp_net_vecs_init(nn); if (!nn->dp.netdev) return 0; return register_netdev(nn->dp.netdev); err_clean_mbox: nfp_ccm_mbox_clean(nn); return err; } /** * nfp_net_clean() - Undo what nfp_net_init() did. * @nn: NFP Net device structure */ void nfp_net_clean(struct nfp_net *nn) { if (!nn->dp.netdev) return; unregister_netdev(nn->dp.netdev); nfp_ccm_mbox_clean(nn); nfp_net_reconfig_wait_posted(nn); }
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