| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Edward Cree | 3563 | 99.78% | 1 | 50.00% |
| Philippe Reynes | 8 | 0.22% | 1 | 50.00% |
| Total | 3571 | 2 |
/**************************************************************************** * Driver for Solarflare network controllers and boards * Copyright 2005-2006 Fen Systems Ltd. * Copyright 2005-2013 Solarflare Communications Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation, incorporated herein by reference. */ /* Common definitions for all Efx net driver code */ #ifndef EF4_NET_DRIVER_H #define EF4_NET_DRIVER_H #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/ethtool.h> #include <linux/if_vlan.h> #include <linux/timer.h> #include <linux/mdio.h> #include <linux/list.h> #include <linux/pci.h> #include <linux/device.h> #include <linux/highmem.h> #include <linux/workqueue.h> #include <linux/mutex.h> #include <linux/rwsem.h> #include <linux/vmalloc.h> #include <linux/i2c.h> #include <linux/mtd/mtd.h> #include <net/busy_poll.h> #include "enum.h" #include "bitfield.h" #include "filter.h" /************************************************************************** * * Build definitions * **************************************************************************/ #define EF4_DRIVER_VERSION "4.1" #ifdef DEBUG #define EF4_BUG_ON_PARANOID(x) BUG_ON(x) #define EF4_WARN_ON_PARANOID(x) WARN_ON(x) #else #define EF4_BUG_ON_PARANOID(x) do {} while (0) #define EF4_WARN_ON_PARANOID(x) do {} while (0) #endif /************************************************************************** * * Efx data structures * **************************************************************************/ #define EF4_MAX_CHANNELS 32U #define EF4_MAX_RX_QUEUES EF4_MAX_CHANNELS #define EF4_EXTRA_CHANNEL_IOV 0 #define EF4_EXTRA_CHANNEL_PTP 1 #define EF4_MAX_EXTRA_CHANNELS 2U /* Checksum generation is a per-queue option in hardware, so each * queue visible to the networking core is backed by two hardware TX * queues. */ #define EF4_MAX_TX_TC 2 #define EF4_MAX_CORE_TX_QUEUES (EF4_MAX_TX_TC * EF4_MAX_CHANNELS) #define EF4_TXQ_TYPE_OFFLOAD 1 /* flag */ #define EF4_TXQ_TYPE_HIGHPRI 2 /* flag */ #define EF4_TXQ_TYPES 4 #define EF4_MAX_TX_QUEUES (EF4_TXQ_TYPES * EF4_MAX_CHANNELS) /* Maximum possible MTU the driver supports */ #define EF4_MAX_MTU (9 * 1024) /* Minimum MTU, from RFC791 (IP) */ #define EF4_MIN_MTU 68 /* Size of an RX scatter buffer. Small enough to pack 2 into a 4K page, * and should be a multiple of the cache line size. */ #define EF4_RX_USR_BUF_SIZE (2048 - 256) /* If possible, we should ensure cache line alignment at start and end * of every buffer. Otherwise, we just need to ensure 4-byte * alignment of the network header. */ #if NET_IP_ALIGN == 0 #define EF4_RX_BUF_ALIGNMENT L1_CACHE_BYTES #else #define EF4_RX_BUF_ALIGNMENT 4 #endif struct ef4_self_tests; /** * struct ef4_buffer - A general-purpose DMA buffer * @addr: host base address of the buffer * @dma_addr: DMA base address of the buffer * @len: Buffer length, in bytes * * The NIC uses these buffers for its interrupt status registers and * MAC stats dumps. */ struct ef4_buffer { void *addr; dma_addr_t dma_addr; unsigned int len; }; /** * struct ef4_special_buffer - DMA buffer entered into buffer table * @buf: Standard &struct ef4_buffer * @index: Buffer index within controller;s buffer table * @entries: Number of buffer table entries * * The NIC has a buffer table that maps buffers of size %EF4_BUF_SIZE. * Event and descriptor rings are addressed via one or more buffer * table entries (and so can be physically non-contiguous, although we * currently do not take advantage of that). On Falcon and Siena we * have to take care of allocating and initialising the entries * ourselves. On later hardware this is managed by the firmware and * @index and @entries are left as 0. */ struct ef4_special_buffer { struct ef4_buffer buf; unsigned int index; unsigned int entries; }; /** * struct ef4_tx_buffer - buffer state for a TX descriptor * @skb: When @flags & %EF4_TX_BUF_SKB, the associated socket buffer to be * freed when descriptor completes * @option: When @flags & %EF4_TX_BUF_OPTION, a NIC-specific option descriptor. * @dma_addr: DMA address of the fragment. * @flags: Flags for allocation and DMA mapping type * @len: Length of this fragment. * This field is zero when the queue slot is empty. * @unmap_len: Length of this fragment to unmap * @dma_offset: Offset of @dma_addr from the address of the backing DMA mapping. * Only valid if @unmap_len != 0. */ struct ef4_tx_buffer { const struct sk_buff *skb; union { ef4_qword_t option; dma_addr_t dma_addr; }; unsigned short flags; unsigned short len; unsigned short unmap_len; unsigned short dma_offset; }; #define EF4_TX_BUF_CONT 1 /* not last descriptor of packet */ #define EF4_TX_BUF_SKB 2 /* buffer is last part of skb */ #define EF4_TX_BUF_MAP_SINGLE 8 /* buffer was mapped with dma_map_single() */ #define EF4_TX_BUF_OPTION 0x10 /* empty buffer for option descriptor */ /** * struct ef4_tx_queue - An Efx TX queue * * This is a ring buffer of TX fragments. * Since the TX completion path always executes on the same * CPU and the xmit path can operate on different CPUs, * performance is increased by ensuring that the completion * path and the xmit path operate on different cache lines. * This is particularly important if the xmit path is always * executing on one CPU which is different from the completion * path. There is also a cache line for members which are * read but not written on the fast path. * * @efx: The associated Efx NIC * @queue: DMA queue number * @channel: The associated channel * @core_txq: The networking core TX queue structure * @buffer: The software buffer ring * @cb_page: Array of pages of copy buffers. Carved up according to * %EF4_TX_CB_ORDER into %EF4_TX_CB_SIZE-sized chunks. * @txd: The hardware descriptor ring * @ptr_mask: The size of the ring minus 1. * @initialised: Has hardware queue been initialised? * @tx_min_size: Minimum transmit size for this queue. Depends on HW. * @read_count: Current read pointer. * This is the number of buffers that have been removed from both rings. * @old_write_count: The value of @write_count when last checked. * This is here for performance reasons. The xmit path will * only get the up-to-date value of @write_count if this * variable indicates that the queue is empty. This is to * avoid cache-line ping-pong between the xmit path and the * completion path. * @merge_events: Number of TX merged completion events * @insert_count: Current insert pointer * This is the number of buffers that have been added to the * software ring. * @write_count: Current write pointer * This is the number of buffers that have been added to the * hardware ring. * @old_read_count: The value of read_count when last checked. * This is here for performance reasons. The xmit path will * only get the up-to-date value of read_count if this * variable indicates that the queue is full. This is to * avoid cache-line ping-pong between the xmit path and the * completion path. * @pushes: Number of times the TX push feature has been used * @xmit_more_available: Are any packets waiting to be pushed to the NIC * @cb_packets: Number of times the TX copybreak feature has been used * @empty_read_count: If the completion path has seen the queue as empty * and the transmission path has not yet checked this, the value of * @read_count bitwise-added to %EF4_EMPTY_COUNT_VALID; otherwise 0. */ struct ef4_tx_queue { /* Members which don't change on the fast path */ struct ef4_nic *efx ____cacheline_aligned_in_smp; unsigned queue; struct ef4_channel *channel; struct netdev_queue *core_txq; struct ef4_tx_buffer *buffer; struct ef4_buffer *cb_page; struct ef4_special_buffer txd; unsigned int ptr_mask; bool initialised; unsigned int tx_min_size; /* Function pointers used in the fast path. */ int (*handle_tso)(struct ef4_tx_queue*, struct sk_buff*, bool *); /* Members used mainly on the completion path */ unsigned int read_count ____cacheline_aligned_in_smp; unsigned int old_write_count; unsigned int merge_events; unsigned int bytes_compl; unsigned int pkts_compl; /* Members used only on the xmit path */ unsigned int insert_count ____cacheline_aligned_in_smp; unsigned int write_count; unsigned int old_read_count; unsigned int pushes; bool xmit_more_available; unsigned int cb_packets; /* Statistics to supplement MAC stats */ unsigned long tx_packets; /* Members shared between paths and sometimes updated */ unsigned int empty_read_count ____cacheline_aligned_in_smp; #define EF4_EMPTY_COUNT_VALID 0x80000000 atomic_t flush_outstanding; }; #define EF4_TX_CB_ORDER 7 #define EF4_TX_CB_SIZE (1 << EF4_TX_CB_ORDER) - NET_IP_ALIGN /** * struct ef4_rx_buffer - An Efx RX data buffer * @dma_addr: DMA base address of the buffer * @page: The associated page buffer. * Will be %NULL if the buffer slot is currently free. * @page_offset: If pending: offset in @page of DMA base address. * If completed: offset in @page of Ethernet header. * @len: If pending: length for DMA descriptor. * If completed: received length, excluding hash prefix. * @flags: Flags for buffer and packet state. These are only set on the * first buffer of a scattered packet. */ struct ef4_rx_buffer { dma_addr_t dma_addr; struct page *page; u16 page_offset; u16 len; u16 flags; }; #define EF4_RX_BUF_LAST_IN_PAGE 0x0001 #define EF4_RX_PKT_CSUMMED 0x0002 #define EF4_RX_PKT_DISCARD 0x0004 #define EF4_RX_PKT_TCP 0x0040 #define EF4_RX_PKT_PREFIX_LEN 0x0080 /* length is in prefix only */ /** * struct ef4_rx_page_state - Page-based rx buffer state * * Inserted at the start of every page allocated for receive buffers. * Used to facilitate sharing dma mappings between recycled rx buffers * and those passed up to the kernel. * * @dma_addr: The dma address of this page. */ struct ef4_rx_page_state { dma_addr_t dma_addr; unsigned int __pad[0] ____cacheline_aligned; }; /** * struct ef4_rx_queue - An Efx RX queue * @efx: The associated Efx NIC * @core_index: Index of network core RX queue. Will be >= 0 iff this * is associated with a real RX queue. * @buffer: The software buffer ring * @rxd: The hardware descriptor ring * @ptr_mask: The size of the ring minus 1. * @refill_enabled: Enable refill whenever fill level is low * @flush_pending: Set when a RX flush is pending. Has the same lifetime as * @rxq_flush_pending. * @added_count: Number of buffers added to the receive queue. * @notified_count: Number of buffers given to NIC (<= @added_count). * @removed_count: Number of buffers removed from the receive queue. * @scatter_n: Used by NIC specific receive code. * @scatter_len: Used by NIC specific receive code. * @page_ring: The ring to store DMA mapped pages for reuse. * @page_add: Counter to calculate the write pointer for the recycle ring. * @page_remove: Counter to calculate the read pointer for the recycle ring. * @page_recycle_count: The number of pages that have been recycled. * @page_recycle_failed: The number of pages that couldn't be recycled because * the kernel still held a reference to them. * @page_recycle_full: The number of pages that were released because the * recycle ring was full. * @page_ptr_mask: The number of pages in the RX recycle ring minus 1. * @max_fill: RX descriptor maximum fill level (<= ring size) * @fast_fill_trigger: RX descriptor fill level that will trigger a fast fill * (<= @max_fill) * @min_fill: RX descriptor minimum non-zero fill level. * This records the minimum fill level observed when a ring * refill was triggered. * @recycle_count: RX buffer recycle counter. * @slow_fill: Timer used to defer ef4_nic_generate_fill_event(). */ struct ef4_rx_queue { struct ef4_nic *efx; int core_index; struct ef4_rx_buffer *buffer; struct ef4_special_buffer rxd; unsigned int ptr_mask; bool refill_enabled; bool flush_pending; unsigned int added_count; unsigned int notified_count; unsigned int removed_count; unsigned int scatter_n; unsigned int scatter_len; struct page **page_ring; unsigned int page_add; unsigned int page_remove; unsigned int page_recycle_count; unsigned int page_recycle_failed; unsigned int page_recycle_full; unsigned int page_ptr_mask; unsigned int max_fill; unsigned int fast_fill_trigger; unsigned int min_fill; unsigned int min_overfill; unsigned int recycle_count; struct timer_list slow_fill; unsigned int slow_fill_count; /* Statistics to supplement MAC stats */ unsigned long rx_packets; }; /** * struct ef4_channel - An Efx channel * * A channel comprises an event queue, at least one TX queue, at least * one RX queue, and an associated tasklet for processing the event * queue. * * @efx: Associated Efx NIC * @channel: Channel instance number * @type: Channel type definition * @eventq_init: Event queue initialised flag * @enabled: Channel enabled indicator * @irq: IRQ number (MSI and MSI-X only) * @irq_moderation_us: IRQ moderation value (in microseconds) * @napi_dev: Net device used with NAPI * @napi_str: NAPI control structure * @state: state for NAPI vs busy polling * @state_lock: lock protecting @state * @eventq: Event queue buffer * @eventq_mask: Event queue pointer mask * @eventq_read_ptr: Event queue read pointer * @event_test_cpu: Last CPU to handle interrupt or test event for this channel * @irq_count: Number of IRQs since last adaptive moderation decision * @irq_mod_score: IRQ moderation score * @rps_flow_id: Flow IDs of filters allocated for accelerated RFS, * indexed by filter ID * @n_rx_tobe_disc: Count of RX_TOBE_DISC errors * @n_rx_ip_hdr_chksum_err: Count of RX IP header checksum errors * @n_rx_tcp_udp_chksum_err: Count of RX TCP and UDP checksum errors * @n_rx_mcast_mismatch: Count of unmatched multicast frames * @n_rx_frm_trunc: Count of RX_FRM_TRUNC errors * @n_rx_overlength: Count of RX_OVERLENGTH errors * @n_skbuff_leaks: Count of skbuffs leaked due to RX overrun * @n_rx_nodesc_trunc: Number of RX packets truncated and then dropped due to * lack of descriptors * @n_rx_merge_events: Number of RX merged completion events * @n_rx_merge_packets: Number of RX packets completed by merged events * @rx_pkt_n_frags: Number of fragments in next packet to be delivered by * __ef4_rx_packet(), or zero if there is none * @rx_pkt_index: Ring index of first buffer for next packet to be delivered * by __ef4_rx_packet(), if @rx_pkt_n_frags != 0 * @rx_queue: RX queue for this channel * @tx_queue: TX queues for this channel */ struct ef4_channel { struct ef4_nic *efx; int channel; const struct ef4_channel_type *type; bool eventq_init; bool enabled; int irq; unsigned int irq_moderation_us; struct net_device *napi_dev; struct napi_struct napi_str; #ifdef CONFIG_NET_RX_BUSY_POLL unsigned long busy_poll_state; #endif struct ef4_special_buffer eventq; unsigned int eventq_mask; unsigned int eventq_read_ptr; int event_test_cpu; unsigned int irq_count; unsigned int irq_mod_score; #ifdef CONFIG_RFS_ACCEL unsigned int rfs_filters_added; #define RPS_FLOW_ID_INVALID 0xFFFFFFFF u32 *rps_flow_id; #endif unsigned n_rx_tobe_disc; unsigned n_rx_ip_hdr_chksum_err; unsigned n_rx_tcp_udp_chksum_err; unsigned n_rx_mcast_mismatch; unsigned n_rx_frm_trunc; unsigned n_rx_overlength; unsigned n_skbuff_leaks; unsigned int n_rx_nodesc_trunc; unsigned int n_rx_merge_events; unsigned int n_rx_merge_packets; unsigned int rx_pkt_n_frags; unsigned int rx_pkt_index; struct ef4_rx_queue rx_queue; struct ef4_tx_queue tx_queue[EF4_TXQ_TYPES]; }; /** * struct ef4_msi_context - Context for each MSI * @efx: The associated NIC * @index: Index of the channel/IRQ * @name: Name of the channel/IRQ * * Unlike &struct ef4_channel, this is never reallocated and is always * safe for the IRQ handler to access. */ struct ef4_msi_context { struct ef4_nic *efx; unsigned int index; char name[IFNAMSIZ + 6]; }; /** * struct ef4_channel_type - distinguishes traffic and extra channels * @handle_no_channel: Handle failure to allocate an extra channel * @pre_probe: Set up extra state prior to initialisation * @post_remove: Tear down extra state after finalisation, if allocated. * May be called on channels that have not been probed. * @get_name: Generate the channel's name (used for its IRQ handler) * @copy: Copy the channel state prior to reallocation. May be %NULL if * reallocation is not supported. * @receive_skb: Handle an skb ready to be passed to netif_receive_skb() * @keep_eventq: Flag for whether event queue should be kept initialised * while the device is stopped */ struct ef4_channel_type { void (*handle_no_channel)(struct ef4_nic *); int (*pre_probe)(struct ef4_channel *); void (*post_remove)(struct ef4_channel *); void (*get_name)(struct ef4_channel *, char *buf, size_t len); struct ef4_channel *(*copy)(const struct ef4_channel *); bool (*receive_skb)(struct ef4_channel *, struct sk_buff *); bool keep_eventq; }; enum ef4_led_mode { EF4_LED_OFF = 0, EF4_LED_ON = 1, EF4_LED_DEFAULT = 2 }; #define STRING_TABLE_LOOKUP(val, member) \ ((val) < member ## _max) ? member ## _names[val] : "(invalid)" extern const char *const ef4_loopback_mode_names[]; extern const unsigned int ef4_loopback_mode_max; #define LOOPBACK_MODE(efx) \ STRING_TABLE_LOOKUP((efx)->loopback_mode, ef4_loopback_mode) extern const char *const ef4_reset_type_names[]; extern const unsigned int ef4_reset_type_max; #define RESET_TYPE(type) \ STRING_TABLE_LOOKUP(type, ef4_reset_type) enum ef4_int_mode { /* Be careful if altering to correct macro below */ EF4_INT_MODE_MSIX = 0, EF4_INT_MODE_MSI = 1, EF4_INT_MODE_LEGACY = 2, EF4_INT_MODE_MAX /* Insert any new items before this */ }; #define EF4_INT_MODE_USE_MSI(x) (((x)->interrupt_mode) <= EF4_INT_MODE_MSI) enum nic_state { STATE_UNINIT = 0, /* device being probed/removed or is frozen */ STATE_READY = 1, /* hardware ready and netdev registered */ STATE_DISABLED = 2, /* device disabled due to hardware errors */ STATE_RECOVERY = 3, /* device recovering from PCI error */ }; /* Forward declaration */ struct ef4_nic; /* Pseudo bit-mask flow control field */ #define EF4_FC_RX FLOW_CTRL_RX #define EF4_FC_TX FLOW_CTRL_TX #define EF4_FC_AUTO 4 /** * struct ef4_link_state - Current state of the link * @up: Link is up * @fd: Link is full-duplex * @fc: Actual flow control flags * @speed: Link speed (Mbps) */ struct ef4_link_state { bool up; bool fd; u8 fc; unsigned int speed; }; static inline bool ef4_link_state_equal(const struct ef4_link_state *left, const struct ef4_link_state *right) { return left->up == right->up && left->fd == right->fd && left->fc == right->fc && left->speed == right->speed; } /** * struct ef4_phy_operations - Efx PHY operations table * @probe: Probe PHY and initialise efx->mdio.mode_support, efx->mdio.mmds, * efx->loopback_modes. * @init: Initialise PHY * @fini: Shut down PHY * @reconfigure: Reconfigure PHY (e.g. for new link parameters) * @poll: Update @link_state and report whether it changed. * Serialised by the mac_lock. * @get_link_ksettings: Get ethtool settings. Serialised by the mac_lock. * @set_link_ksettings: Set ethtool settings. Serialised by the mac_lock. * @set_npage_adv: Set abilities advertised in (Extended) Next Page * (only needed where AN bit is set in mmds) * @test_alive: Test that PHY is 'alive' (online) * @test_name: Get the name of a PHY-specific test/result * @run_tests: Run tests and record results as appropriate (offline). * Flags are the ethtool tests flags. */ struct ef4_phy_operations { int (*probe) (struct ef4_nic *efx); int (*init) (struct ef4_nic *efx); void (*fini) (struct ef4_nic *efx); void (*remove) (struct ef4_nic *efx); int (*reconfigure) (struct ef4_nic *efx); bool (*poll) (struct ef4_nic *efx); void (*get_link_ksettings)(struct ef4_nic *efx, struct ethtool_link_ksettings *cmd); int (*set_link_ksettings)(struct ef4_nic *efx, const struct ethtool_link_ksettings *cmd); void (*set_npage_adv) (struct ef4_nic *efx, u32); int (*test_alive) (struct ef4_nic *efx); const char *(*test_name) (struct ef4_nic *efx, unsigned int index); int (*run_tests) (struct ef4_nic *efx, int *results, unsigned flags); int (*get_module_eeprom) (struct ef4_nic *efx, struct ethtool_eeprom *ee, u8 *data); int (*get_module_info) (struct ef4_nic *efx, struct ethtool_modinfo *modinfo); }; /** * enum ef4_phy_mode - PHY operating mode flags * @PHY_MODE_NORMAL: on and should pass traffic * @PHY_MODE_TX_DISABLED: on with TX disabled * @PHY_MODE_LOW_POWER: set to low power through MDIO * @PHY_MODE_OFF: switched off through external control * @PHY_MODE_SPECIAL: on but will not pass traffic */ enum ef4_phy_mode { PHY_MODE_NORMAL = 0, PHY_MODE_TX_DISABLED = 1, PHY_MODE_LOW_POWER = 2, PHY_MODE_OFF = 4, PHY_MODE_SPECIAL = 8, }; static inline bool ef4_phy_mode_disabled(enum ef4_phy_mode mode) { return !!(mode & ~PHY_MODE_TX_DISABLED); } /** * struct ef4_hw_stat_desc - Description of a hardware statistic * @name: Name of the statistic as visible through ethtool, or %NULL if * it should not be exposed * @dma_width: Width in bits (0 for non-DMA statistics) * @offset: Offset within stats (ignored for non-DMA statistics) */ struct ef4_hw_stat_desc { const char *name; u16 dma_width; u16 offset; }; /* Number of bits used in a multicast filter hash address */ #define EF4_MCAST_HASH_BITS 8 /* Number of (single-bit) entries in a multicast filter hash */ #define EF4_MCAST_HASH_ENTRIES (1 << EF4_MCAST_HASH_BITS) /* An Efx multicast filter hash */ union ef4_multicast_hash { u8 byte[EF4_MCAST_HASH_ENTRIES / 8]; ef4_oword_t oword[EF4_MCAST_HASH_ENTRIES / sizeof(ef4_oword_t) / 8]; }; /** * struct ef4_nic - an Efx NIC * @name: Device name (net device name or bus id before net device registered) * @pci_dev: The PCI device * @node: List node for maintaning primary/secondary function lists * @primary: &struct ef4_nic instance for the primary function of this * controller. May be the same structure, and may be %NULL if no * primary function is bound. Serialised by rtnl_lock. * @secondary_list: List of &struct ef4_nic instances for the secondary PCI * functions of the controller, if this is for the primary function. * Serialised by rtnl_lock. * @type: Controller type attributes * @legacy_irq: IRQ number * @workqueue: Workqueue for port reconfigures and the HW monitor. * Work items do not hold and must not acquire RTNL. * @workqueue_name: Name of workqueue * @reset_work: Scheduled reset workitem * @membase_phys: Memory BAR value as physical address * @membase: Memory BAR value * @interrupt_mode: Interrupt mode * @timer_quantum_ns: Interrupt timer quantum, in nanoseconds * @timer_max_ns: Interrupt timer maximum value, in nanoseconds * @irq_rx_adaptive: Adaptive IRQ moderation enabled for RX event queues * @irq_rx_mod_step_us: Step size for IRQ moderation for RX event queues * @irq_rx_moderation_us: IRQ moderation time for RX event queues * @msg_enable: Log message enable flags * @state: Device state number (%STATE_*). Serialised by the rtnl_lock. * @reset_pending: Bitmask for pending resets * @tx_queue: TX DMA queues * @rx_queue: RX DMA queues * @channel: Channels * @msi_context: Context for each MSI * @extra_channel_types: Types of extra (non-traffic) channels that * should be allocated for this NIC * @rxq_entries: Size of receive queues requested by user. * @txq_entries: Size of transmit queues requested by user. * @txq_stop_thresh: TX queue fill level at or above which we stop it. * @txq_wake_thresh: TX queue fill level at or below which we wake it. * @tx_dc_base: Base qword address in SRAM of TX queue descriptor caches * @rx_dc_base: Base qword address in SRAM of RX queue descriptor caches * @sram_lim_qw: Qword address limit of SRAM * @next_buffer_table: First available buffer table id * @n_channels: Number of channels in use * @n_rx_channels: Number of channels used for RX (= number of RX queues) * @n_tx_channels: Number of channels used for TX * @rx_ip_align: RX DMA address offset to have IP header aligned in * in accordance with NET_IP_ALIGN * @rx_dma_len: Current maximum RX DMA length * @rx_buffer_order: Order (log2) of number of pages for each RX buffer * @rx_buffer_truesize: Amortised allocation size of an RX buffer, * for use in sk_buff::truesize * @rx_prefix_size: Size of RX prefix before packet data * @rx_packet_hash_offset: Offset of RX flow hash from start of packet data * (valid only if @rx_prefix_size != 0; always negative) * @rx_packet_len_offset: Offset of RX packet length from start of packet data * (valid only for NICs that set %EF4_RX_PKT_PREFIX_LEN; always negative) * @rx_packet_ts_offset: Offset of timestamp from start of packet data * (valid only if channel->sync_timestamps_enabled; always negative) * @rx_hash_key: Toeplitz hash key for RSS * @rx_indir_table: Indirection table for RSS * @rx_scatter: Scatter mode enabled for receives * @int_error_count: Number of internal errors seen recently * @int_error_expire: Time at which error count will be expired * @irq_soft_enabled: Are IRQs soft-enabled? If not, IRQ handler will * acknowledge but do nothing else. * @irq_status: Interrupt status buffer * @irq_zero_count: Number of legacy IRQs seen with queue flags == 0 * @irq_level: IRQ level/index for IRQs not triggered by an event queue * @selftest_work: Work item for asynchronous self-test * @mtd_list: List of MTDs attached to the NIC * @nic_data: Hardware dependent state * @mac_lock: MAC access lock. Protects @port_enabled, @phy_mode, * ef4_monitor() and ef4_reconfigure_port() * @port_enabled: Port enabled indicator. * Serialises ef4_stop_all(), ef4_start_all(), ef4_monitor() and * ef4_mac_work() with kernel interfaces. Safe to read under any * one of the rtnl_lock, mac_lock, or netif_tx_lock, but all three must * be held to modify it. * @port_initialized: Port initialized? * @net_dev: Operating system network device. Consider holding the rtnl lock * @fixed_features: Features which cannot be turned off * @stats_buffer: DMA buffer for statistics * @phy_type: PHY type * @phy_op: PHY interface * @phy_data: PHY private data (including PHY-specific stats) * @mdio: PHY MDIO interface * @phy_mode: PHY operating mode. Serialised by @mac_lock. * @link_advertising: Autonegotiation advertising flags * @link_state: Current state of the link * @n_link_state_changes: Number of times the link has changed state * @unicast_filter: Flag for Falcon-arch simple unicast filter. * Protected by @mac_lock. * @multicast_hash: Multicast hash table for Falcon-arch. * Protected by @mac_lock. * @wanted_fc: Wanted flow control flags * @fc_disable: When non-zero flow control is disabled. Typically used to * ensure that network back pressure doesn't delay dma queue flushes. * Serialised by the rtnl lock. * @mac_work: Work item for changing MAC promiscuity and multicast hash * @loopback_mode: Loopback status * @loopback_modes: Supported loopback mode bitmask * @loopback_selftest: Offline self-test private state * @filter_sem: Filter table rw_semaphore, for freeing the table * @filter_lock: Filter table lock, for mere content changes * @filter_state: Architecture-dependent filter table state * @rps_expire_channel: Next channel to check for expiry * @rps_expire_index: Next index to check for expiry in * @rps_expire_channel's @rps_flow_id * @active_queues: Count of RX and TX queues that haven't been flushed and drained. * @rxq_flush_pending: Count of number of receive queues that need to be flushed. * Decremented when the ef4_flush_rx_queue() is called. * @rxq_flush_outstanding: Count of number of RX flushes started but not yet * completed (either success or failure). Not used when MCDI is used to * flush receive queues. * @flush_wq: wait queue used by ef4_nic_flush_queues() to wait for flush completions. * @vpd_sn: Serial number read from VPD * @monitor_work: Hardware monitor workitem * @biu_lock: BIU (bus interface unit) lock * @last_irq_cpu: Last CPU to handle a possible test interrupt. This * field is used by ef4_test_interrupts() to verify that an * interrupt has occurred. * @stats_lock: Statistics update lock. Must be held when calling * ef4_nic_type::{update,start,stop}_stats. * @n_rx_noskb_drops: Count of RX packets dropped due to failure to allocate an skb * * This is stored in the private area of the &struct net_device. */ struct ef4_nic { /* The following fields should be written very rarely */ char name[IFNAMSIZ]; struct list_head node; struct ef4_nic *primary; struct list_head secondary_list; struct pci_dev *pci_dev; unsigned int port_num; const struct ef4_nic_type *type; int legacy_irq; bool eeh_disabled_legacy_irq; struct workqueue_struct *workqueue; char workqueue_name[16]; struct work_struct reset_work; resource_size_t membase_phys; void __iomem *membase; enum ef4_int_mode interrupt_mode; unsigned int timer_quantum_ns; unsigned int timer_max_ns; bool irq_rx_adaptive; unsigned int irq_mod_step_us; unsigned int irq_rx_moderation_us; u32 msg_enable; enum nic_state state; unsigned long reset_pending; struct ef4_channel *channel[EF4_MAX_CHANNELS]; struct ef4_msi_context msi_context[EF4_MAX_CHANNELS]; const struct ef4_channel_type * extra_channel_type[EF4_MAX_EXTRA_CHANNELS]; unsigned rxq_entries; unsigned txq_entries; unsigned int txq_stop_thresh; unsigned int txq_wake_thresh; unsigned tx_dc_base; unsigned rx_dc_base; unsigned sram_lim_qw; unsigned next_buffer_table; unsigned int max_channels; unsigned int max_tx_channels; unsigned n_channels; unsigned n_rx_channels; unsigned rss_spread; unsigned tx_channel_offset; unsigned n_tx_channels; unsigned int rx_ip_align; unsigned int rx_dma_len; unsigned int rx_buffer_order; unsigned int rx_buffer_truesize; unsigned int rx_page_buf_step; unsigned int rx_bufs_per_page; unsigned int rx_pages_per_batch; unsigned int rx_prefix_size; int rx_packet_hash_offset; int rx_packet_len_offset; int rx_packet_ts_offset; u8 rx_hash_key[40]; u32 rx_indir_table[128]; bool rx_scatter; unsigned int_error_count; unsigned long int_error_expire; bool irq_soft_enabled; struct ef4_buffer irq_status; unsigned irq_zero_count; unsigned irq_level; struct delayed_work selftest_work; #ifdef CONFIG_SFC_FALCON_MTD struct list_head mtd_list; #endif void *nic_data; struct mutex mac_lock; struct work_struct mac_work; bool port_enabled; bool mc_bist_for_other_fn; bool port_initialized; struct net_device *net_dev; netdev_features_t fixed_features; struct ef4_buffer stats_buffer; u64 rx_nodesc_drops_total; u64 rx_nodesc_drops_while_down; bool rx_nodesc_drops_prev_state; unsigned int phy_type; const struct ef4_phy_operations *phy_op; void *phy_data; struct mdio_if_info mdio; enum ef4_phy_mode phy_mode; u32 link_advertising; struct ef4_link_state link_state; unsigned int n_link_state_changes; bool unicast_filter; union ef4_multicast_hash multicast_hash; u8 wanted_fc; unsigned fc_disable; atomic_t rx_reset; enum ef4_loopback_mode loopback_mode; u64 loopback_modes; void *loopback_selftest; struct rw_semaphore filter_sem; spinlock_t filter_lock; void *filter_state; #ifdef CONFIG_RFS_ACCEL unsigned int rps_expire_channel; unsigned int rps_expire_index; #endif atomic_t active_queues; atomic_t rxq_flush_pending; atomic_t rxq_flush_outstanding; wait_queue_head_t flush_wq; char *vpd_sn; /* The following fields may be written more often */ struct delayed_work monitor_work ____cacheline_aligned_in_smp; spinlock_t biu_lock; int last_irq_cpu; spinlock_t stats_lock; atomic_t n_rx_noskb_drops; }; static inline int ef4_dev_registered(struct ef4_nic *efx) { return efx->net_dev->reg_state == NETREG_REGISTERED; } static inline unsigned int ef4_port_num(struct ef4_nic *efx) { return efx->port_num; } struct ef4_mtd_partition { struct list_head node; struct mtd_info mtd; const char *dev_type_name; const char *type_name; char name[IFNAMSIZ + 20]; }; /** * struct ef4_nic_type - Efx device type definition * @mem_bar: Get the memory BAR * @mem_map_size: Get memory BAR mapped size * @probe: Probe the controller * @remove: Free resources allocated by probe() * @init: Initialise the controller * @dimension_resources: Dimension controller resources (buffer table, * and VIs once the available interrupt resources are clear) * @fini: Shut down the controller * @monitor: Periodic function for polling link state and hardware monitor * @map_reset_reason: Map ethtool reset reason to a reset method * @map_reset_flags: Map ethtool reset flags to a reset method, if possible * @reset: Reset the controller hardware and possibly the PHY. This will * be called while the controller is uninitialised. * @probe_port: Probe the MAC and PHY * @remove_port: Free resources allocated by probe_port() * @handle_global_event: Handle a "global" event (may be %NULL) * @fini_dmaq: Flush and finalise DMA queues (RX and TX queues) * @prepare_flush: Prepare the hardware for flushing the DMA queues * (for Falcon architecture) * @finish_flush: Clean up after flushing the DMA queues (for Falcon * architecture) * @prepare_flr: Prepare for an FLR * @finish_flr: Clean up after an FLR * @describe_stats: Describe statistics for ethtool * @update_stats: Update statistics not provided by event handling. * Either argument may be %NULL. * @start_stats: Start the regular fetching of statistics * @pull_stats: Pull stats from the NIC and wait until they arrive. * @stop_stats: Stop the regular fetching of statistics * @set_id_led: Set state of identifying LED or revert to automatic function * @push_irq_moderation: Apply interrupt moderation value * @reconfigure_port: Push loopback/power/txdis changes to the MAC and PHY * @prepare_enable_fc_tx: Prepare MAC to enable pause frame TX (may be %NULL) * @reconfigure_mac: Push MAC address, MTU, flow control and filter settings * to the hardware. Serialised by the mac_lock. * @check_mac_fault: Check MAC fault state. True if fault present. * @get_wol: Get WoL configuration from driver state * @set_wol: Push WoL configuration to the NIC * @resume_wol: Synchronise WoL state between driver and MC (e.g. after resume) * @test_chip: Test registers. May use ef4_farch_test_registers(), and is * expected to reset the NIC. * @test_nvram: Test validity of NVRAM contents * @irq_enable_master: Enable IRQs on the NIC. Each event queue must * be separately enabled after this. * @irq_test_generate: Generate a test IRQ * @irq_disable_non_ev: Disable non-event IRQs on the NIC. Each event * queue must be separately disabled before this. * @irq_handle_msi: Handle MSI for a channel. The @dev_id argument is * a pointer to the &struct ef4_msi_context for the channel. * @irq_handle_legacy: Handle legacy interrupt. The @dev_id argument * is a pointer to the &struct ef4_nic. * @tx_probe: Allocate resources for TX queue * @tx_init: Initialise TX queue on the NIC * @tx_remove: Free resources for TX queue * @tx_write: Write TX descriptors and doorbell * @rx_push_rss_config: Write RSS hash key and indirection table to the NIC * @rx_probe: Allocate resources for RX queue * @rx_init: Initialise RX queue on the NIC * @rx_remove: Free resources for RX queue * @rx_write: Write RX descriptors and doorbell * @rx_defer_refill: Generate a refill reminder event * @ev_probe: Allocate resources for event queue * @ev_init: Initialise event queue on the NIC * @ev_fini: Deinitialise event queue on the NIC * @ev_remove: Free resources for event queue * @ev_process: Process events for a queue, up to the given NAPI quota * @ev_read_ack: Acknowledge read events on a queue, rearming its IRQ * @ev_test_generate: Generate a test event * @filter_table_probe: Probe filter capabilities and set up filter software state * @filter_table_restore: Restore filters removed from hardware * @filter_table_remove: Remove filters from hardware and tear down software state * @filter_update_rx_scatter: Update filters after change to rx scatter setting * @filter_insert: add or replace a filter * @filter_remove_safe: remove a filter by ID, carefully * @filter_get_safe: retrieve a filter by ID, carefully * @filter_clear_rx: Remove all RX filters whose priority is less than or * equal to the given priority and is not %EF4_FILTER_PRI_AUTO * @filter_count_rx_used: Get the number of filters in use at a given priority * @filter_get_rx_id_limit: Get maximum value of a filter id, plus 1 * @filter_get_rx_ids: Get list of RX filters at a given priority * @filter_rfs_insert: Add or replace a filter for RFS. This must be * atomic. The hardware change may be asynchronous but should * not be delayed for long. It may fail if this can't be done * atomically. * @filter_rfs_expire_one: Consider expiring a filter inserted for RFS. * This must check whether the specified table entry is used by RFS * and that rps_may_expire_flow() returns true for it. * @mtd_probe: Probe and add MTD partitions associated with this net device, * using ef4_mtd_add() * @mtd_rename: Set an MTD partition name using the net device name * @mtd_read: Read from an MTD partition * @mtd_erase: Erase part of an MTD partition * @mtd_write: Write to an MTD partition * @mtd_sync: Wait for write-back to complete on MTD partition. This * also notifies the driver that a writer has finished using this * partition. * @set_mac_address: Set the MAC address of the device * @revision: Hardware architecture revision * @txd_ptr_tbl_base: TX descriptor ring base address * @rxd_ptr_tbl_base: RX descriptor ring base address * @buf_tbl_base: Buffer table base address * @evq_ptr_tbl_base: Event queue pointer table base address * @evq_rptr_tbl_base: Event queue read-pointer table base address * @max_dma_mask: Maximum possible DMA mask * @rx_prefix_size: Size of RX prefix before packet data * @rx_hash_offset: Offset of RX flow hash within prefix * @rx_ts_offset: Offset of timestamp within prefix * @rx_buffer_padding: Size of padding at end of RX packet * @can_rx_scatter: NIC is able to scatter packets to multiple buffers * @always_rx_scatter: NIC will always scatter packets to multiple buffers * @max_interrupt_mode: Highest capability interrupt mode supported * from &enum ef4_init_mode. * @timer_period_max: Maximum period of interrupt timer (in ticks) * @offload_features: net_device feature flags for protocol offload * features implemented in hardware */ struct ef4_nic_type { unsigned int mem_bar; unsigned int (*mem_map_size)(struct ef4_nic *efx); int (*probe)(struct ef4_nic *efx); void (*remove)(struct ef4_nic *efx); int (*init)(struct ef4_nic *efx); int (*dimension_resources)(struct ef4_nic *efx); void (*fini)(struct ef4_nic *efx); void (*monitor)(struct ef4_nic *efx); enum reset_type (*map_reset_reason)(enum reset_type reason); int (*map_reset_flags)(u32 *flags); int (*reset)(struct ef4_nic *efx, enum reset_type method); int (*probe_port)(struct ef4_nic *efx); void (*remove_port)(struct ef4_nic *efx); bool (*handle_global_event)(struct ef4_channel *channel, ef4_qword_t *); int (*fini_dmaq)(struct ef4_nic *efx); void (*prepare_flush)(struct ef4_nic *efx); void (*finish_flush)(struct ef4_nic *efx); void (*prepare_flr)(struct ef4_nic *efx); void (*finish_flr)(struct ef4_nic *efx); size_t (*describe_stats)(struct ef4_nic *efx, u8 *names); size_t (*update_stats)(struct ef4_nic *efx, u64 *full_stats, struct rtnl_link_stats64 *core_stats); void (*start_stats)(struct ef4_nic *efx); void (*pull_stats)(struct ef4_nic *efx); void (*stop_stats)(struct ef4_nic *efx); void (*set_id_led)(struct ef4_nic *efx, enum ef4_led_mode mode); void (*push_irq_moderation)(struct ef4_channel *channel); int (*reconfigure_port)(struct ef4_nic *efx); void (*prepare_enable_fc_tx)(struct ef4_nic *efx); int (*reconfigure_mac)(struct ef4_nic *efx); bool (*check_mac_fault)(struct ef4_nic *efx); void (*get_wol)(struct ef4_nic *efx, struct ethtool_wolinfo *wol); int (*set_wol)(struct ef4_nic *efx, u32 type); void (*resume_wol)(struct ef4_nic *efx); int (*test_chip)(struct ef4_nic *efx, struct ef4_self_tests *tests); int (*test_nvram)(struct ef4_nic *efx); void (*irq_enable_master)(struct ef4_nic *efx); int (*irq_test_generate)(struct ef4_nic *efx); void (*irq_disable_non_ev)(struct ef4_nic *efx); irqreturn_t (*irq_handle_msi)(int irq, void *dev_id); irqreturn_t (*irq_handle_legacy)(int irq, void *dev_id); int (*tx_probe)(struct ef4_tx_queue *tx_queue); void (*tx_init)(struct ef4_tx_queue *tx_queue); void (*tx_remove)(struct ef4_tx_queue *tx_queue); void (*tx_write)(struct ef4_tx_queue *tx_queue); unsigned int (*tx_limit_len)(struct ef4_tx_queue *tx_queue, dma_addr_t dma_addr, unsigned int len); int (*rx_push_rss_config)(struct ef4_nic *efx, bool user, const u32 *rx_indir_table); int (*rx_probe)(struct ef4_rx_queue *rx_queue); void (*rx_init)(struct ef4_rx_queue *rx_queue); void (*rx_remove)(struct ef4_rx_queue *rx_queue); void (*rx_write)(struct ef4_rx_queue *rx_queue); void (*rx_defer_refill)(struct ef4_rx_queue *rx_queue); int (*ev_probe)(struct ef4_channel *channel); int (*ev_init)(struct ef4_channel *channel); void (*ev_fini)(struct ef4_channel *channel); void (*ev_remove)(struct ef4_channel *channel); int (*ev_process)(struct ef4_channel *channel, int quota); void (*ev_read_ack)(struct ef4_channel *channel); void (*ev_test_generate)(struct ef4_channel *channel); int (*filter_table_probe)(struct ef4_nic *efx); void (*filter_table_restore)(struct ef4_nic *efx); void (*filter_table_remove)(struct ef4_nic *efx); void (*filter_update_rx_scatter)(struct ef4_nic *efx); s32 (*filter_insert)(struct ef4_nic *efx, struct ef4_filter_spec *spec, bool replace); int (*filter_remove_safe)(struct ef4_nic *efx, enum ef4_filter_priority priority, u32 filter_id); int (*filter_get_safe)(struct ef4_nic *efx, enum ef4_filter_priority priority, u32 filter_id, struct ef4_filter_spec *); int (*filter_clear_rx)(struct ef4_nic *efx, enum ef4_filter_priority priority); u32 (*filter_count_rx_used)(struct ef4_nic *efx, enum ef4_filter_priority priority); u32 (*filter_get_rx_id_limit)(struct ef4_nic *efx); s32 (*filter_get_rx_ids)(struct ef4_nic *efx, enum ef4_filter_priority priority, u32 *buf, u32 size); #ifdef CONFIG_RFS_ACCEL s32 (*filter_rfs_insert)(struct ef4_nic *efx, struct ef4_filter_spec *spec); bool (*filter_rfs_expire_one)(struct ef4_nic *efx, u32 flow_id, unsigned int index); #endif #ifdef CONFIG_SFC_FALCON_MTD int (*mtd_probe)(struct ef4_nic *efx); void (*mtd_rename)(struct ef4_mtd_partition *part); int (*mtd_read)(struct mtd_info *mtd, loff_t start, size_t len, size_t *retlen, u8 *buffer); int (*mtd_erase)(struct mtd_info *mtd, loff_t start, size_t len); int (*mtd_write)(struct mtd_info *mtd, loff_t start, size_t len, size_t *retlen, const u8 *buffer); int (*mtd_sync)(struct mtd_info *mtd); #endif int (*get_mac_address)(struct ef4_nic *efx, unsigned char *perm_addr); int (*set_mac_address)(struct ef4_nic *efx); int revision; unsigned int txd_ptr_tbl_base; unsigned int rxd_ptr_tbl_base; unsigned int buf_tbl_base; unsigned int evq_ptr_tbl_base; unsigned int evq_rptr_tbl_base; u64 max_dma_mask; unsigned int rx_prefix_size; unsigned int rx_hash_offset; unsigned int rx_ts_offset; unsigned int rx_buffer_padding; bool can_rx_scatter; bool always_rx_scatter; unsigned int max_interrupt_mode; unsigned int timer_period_max; netdev_features_t offload_features; unsigned int max_rx_ip_filters; }; /************************************************************************** * * Prototypes and inline functions * *************************************************************************/ static inline struct ef4_channel * ef4_get_channel(struct ef4_nic *efx, unsigned index) { EF4_BUG_ON_PARANOID(index >= efx->n_channels); return efx->channel[index]; } /* Iterate over all used channels */ #define ef4_for_each_channel(_channel, _efx) \ for (_channel = (_efx)->channel[0]; \ _channel; \ _channel = (_channel->channel + 1 < (_efx)->n_channels) ? \ (_efx)->channel[_channel->channel + 1] : NULL) /* Iterate over all used channels in reverse */ #define ef4_for_each_channel_rev(_channel, _efx) \ for (_channel = (_efx)->channel[(_efx)->n_channels - 1]; \ _channel; \ _channel = _channel->channel ? \ (_efx)->channel[_channel->channel - 1] : NULL) static inline struct ef4_tx_queue * ef4_get_tx_queue(struct ef4_nic *efx, unsigned index, unsigned type) { EF4_BUG_ON_PARANOID(index >= efx->n_tx_channels || type >= EF4_TXQ_TYPES); return &efx->channel[efx->tx_channel_offset + index]->tx_queue[type]; } static inline bool ef4_channel_has_tx_queues(struct ef4_channel *channel) { return channel->channel - channel->efx->tx_channel_offset < channel->efx->n_tx_channels; } static inline struct ef4_tx_queue * ef4_channel_get_tx_queue(struct ef4_channel *channel, unsigned type) { EF4_BUG_ON_PARANOID(!ef4_channel_has_tx_queues(channel) || type >= EF4_TXQ_TYPES); return &channel->tx_queue[type]; } static inline bool ef4_tx_queue_used(struct ef4_tx_queue *tx_queue) { return !(tx_queue->efx->net_dev->num_tc < 2 && tx_queue->queue & EF4_TXQ_TYPE_HIGHPRI); } /* Iterate over all TX queues belonging to a channel */ #define ef4_for_each_channel_tx_queue(_tx_queue, _channel) \ if (!ef4_channel_has_tx_queues(_channel)) \ ; \ else \ for (_tx_queue = (_channel)->tx_queue; \ _tx_queue < (_channel)->tx_queue + EF4_TXQ_TYPES && \ ef4_tx_queue_used(_tx_queue); \ _tx_queue++) /* Iterate over all possible TX queues belonging to a channel */ #define ef4_for_each_possible_channel_tx_queue(_tx_queue, _channel) \ if (!ef4_channel_has_tx_queues(_channel)) \ ; \ else \ for (_tx_queue = (_channel)->tx_queue; \ _tx_queue < (_channel)->tx_queue + EF4_TXQ_TYPES; \ _tx_queue++) static inline bool ef4_channel_has_rx_queue(struct ef4_channel *channel) { return channel->rx_queue.core_index >= 0; } static inline struct ef4_rx_queue * ef4_channel_get_rx_queue(struct ef4_channel *channel) { EF4_BUG_ON_PARANOID(!ef4_channel_has_rx_queue(channel)); return &channel->rx_queue; } /* Iterate over all RX queues belonging to a channel */ #define ef4_for_each_channel_rx_queue(_rx_queue, _channel) \ if (!ef4_channel_has_rx_queue(_channel)) \ ; \ else \ for (_rx_queue = &(_channel)->rx_queue; \ _rx_queue; \ _rx_queue = NULL) static inline struct ef4_channel * ef4_rx_queue_channel(struct ef4_rx_queue *rx_queue) { return container_of(rx_queue, struct ef4_channel, rx_queue); } static inline int ef4_rx_queue_index(struct ef4_rx_queue *rx_queue) { return ef4_rx_queue_channel(rx_queue)->channel; } /* Returns a pointer to the specified receive buffer in the RX * descriptor queue. */ static inline struct ef4_rx_buffer *ef4_rx_buffer(struct ef4_rx_queue *rx_queue, unsigned int index) { return &rx_queue->buffer[index]; } /** * EF4_MAX_FRAME_LEN - calculate maximum frame length * * This calculates the maximum frame length that will be used for a * given MTU. The frame length will be equal to the MTU plus a * constant amount of header space and padding. This is the quantity * that the net driver will program into the MAC as the maximum frame * length. * * The 10G MAC requires 8-byte alignment on the frame * length, so we round up to the nearest 8. * * Re-clocking by the XGXS on RX can reduce an IPG to 32 bits (half an * XGMII cycle). If the frame length reaches the maximum value in the * same cycle, the XMAC can miss the IPG altogether. We work around * this by adding a further 16 bytes. */ #define EF4_FRAME_PAD 16 #define EF4_MAX_FRAME_LEN(mtu) \ (ALIGN(((mtu) + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN + EF4_FRAME_PAD), 8)) /* Get all supported features. * If a feature is not fixed, it is present in hw_features. * If a feature is fixed, it does not present in hw_features, but * always in features. */ static inline netdev_features_t ef4_supported_features(const struct ef4_nic *efx) { const struct net_device *net_dev = efx->net_dev; return net_dev->features | net_dev->hw_features; } /* Get the current TX queue insert index. */ static inline unsigned int ef4_tx_queue_get_insert_index(const struct ef4_tx_queue *tx_queue) { return tx_queue->insert_count & tx_queue->ptr_mask; } /* Get a TX buffer. */ static inline struct ef4_tx_buffer * __ef4_tx_queue_get_insert_buffer(const struct ef4_tx_queue *tx_queue) { return &tx_queue->buffer[ef4_tx_queue_get_insert_index(tx_queue)]; } /* Get a TX buffer, checking it's not currently in use. */ static inline struct ef4_tx_buffer * ef4_tx_queue_get_insert_buffer(const struct ef4_tx_queue *tx_queue) { struct ef4_tx_buffer *buffer = __ef4_tx_queue_get_insert_buffer(tx_queue); EF4_BUG_ON_PARANOID(buffer->len); EF4_BUG_ON_PARANOID(buffer->flags); EF4_BUG_ON_PARANOID(buffer->unmap_len); return buffer; } #endif /* EF4_NET_DRIVER_H */
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