Release 4.11 drivers/staging/octeon/ethernet-rx.c
/*
* This file is based on code from OCTEON SDK by Cavium Networks.
*
* Copyright (c) 2003-2010 Cavium Networks
*
* This file 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.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/cache.h>
#include <linux/cpumask.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ip.h>
#include <linux/string.h>
#include <linux/prefetch.h>
#include <linux/ratelimit.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <net/dst.h>
#ifdef CONFIG_XFRM
#include <linux/xfrm.h>
#include <net/xfrm.h>
#endif /* CONFIG_XFRM */
#include <asm/octeon/octeon.h>
#include "ethernet-defines.h"
#include "ethernet-mem.h"
#include "ethernet-rx.h"
#include "octeon-ethernet.h"
#include "ethernet-util.h"
#include <asm/octeon/cvmx-helper.h>
#include <asm/octeon/cvmx-wqe.h>
#include <asm/octeon/cvmx-fau.h>
#include <asm/octeon/cvmx-pow.h>
#include <asm/octeon/cvmx-pip.h>
#include <asm/octeon/cvmx-scratch.h>
#include <asm/octeon/cvmx-gmxx-defs.h>
static atomic_t oct_rx_ready = ATOMIC_INIT(0);
static struct oct_rx_group {
int irq;
int group;
struct napi_struct napi;
}
oct_rx_group[16];
/**
* cvm_oct_do_interrupt - interrupt handler.
* @irq: Interrupt number.
* @napi_id: Cookie to identify the NAPI instance.
*
* The interrupt occurs whenever the POW has packets in our group.
*
*/
static irqreturn_t cvm_oct_do_interrupt(int irq, void *napi_id)
{
/* Disable the IRQ and start napi_poll. */
disable_irq_nosync(irq);
napi_schedule(napi_id);
return IRQ_HANDLED;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Daney | 22 | 81.48% | 2 | 40.00% |
| Aaro Koskinen | 5 | 18.52% | 3 | 60.00% |
| Total | 27 | 100.00% | 5 | 100.00% |
/**
* cvm_oct_check_rcv_error - process receive errors
* @work: Work queue entry pointing to the packet.
*
* Returns Non-zero if the packet can be dropped, zero otherwise.
*/
static inline int cvm_oct_check_rcv_error(cvmx_wqe_t *work)
{
int port;
if (octeon_has_feature(OCTEON_FEATURE_PKND))
port = work->word0.pip.cn68xx.pknd;
else
port = work->word1.cn38xx.ipprt;
if ((work->word2.snoip.err_code == 10) && (work->word1.len <= 64)) {
/*
* Ignore length errors on min size packets. Some
* equipment incorrectly pads packets to 64+4FCS
* instead of 60+4FCS. Note these packets still get
* counted as frame errors.
*/
} else if (work->word2.snoip.err_code == 5 ||
work->word2.snoip.err_code == 7) {
/*
* We received a packet with either an alignment error
* or a FCS error. This may be signalling that we are
* running 10Mbps with GMXX_RXX_FRM_CTL[PRE_CHK]
* off. If this is the case we need to parse the
* packet to determine if we can remove a non spec
* preamble and generate a correct packet.
*/
int interface = cvmx_helper_get_interface_num(port);
int index = cvmx_helper_get_interface_index_num(port);
union cvmx_gmxx_rxx_frm_ctl gmxx_rxx_frm_ctl;
gmxx_rxx_frm_ctl.u64 =
cvmx_read_csr(CVMX_GMXX_RXX_FRM_CTL(index, interface));
if (gmxx_rxx_frm_ctl.s.pre_chk == 0) {
u8 *ptr =
cvmx_phys_to_ptr(work->packet_ptr.s.addr);
int i = 0;
while (i < work->word1.len - 1) {
if (*ptr != 0x55)
break;
ptr++;
i++;
}
if (*ptr == 0xd5) {
/* Port received 0xd5 preamble */
work->packet_ptr.s.addr += i + 1;
work->word1.len -= i + 5;
} else if ((*ptr & 0xf) == 0xd) {
/* Port received 0xd preamble */
work->packet_ptr.s.addr += i;
work->word1.len -= i + 4;
for (i = 0; i < work->word1.len; i++) {
*ptr =
((*ptr & 0xf0) >> 4) |
((*(ptr + 1) & 0xf) << 4);
ptr++;
}
} else {
printk_ratelimited("Port %d unknown preamble, packet dropped\n",
port);
cvm_oct_free_work(work);
return 1;
}
}
} else {
printk_ratelimited("Port %d receive error code %d, packet dropped\n",
port, work->word2.snoip.err_code);
cvm_oct_free_work(work);
return 1;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Daney | 302 | 84.83% | 1 | 14.29% |
| Janne Huttunen | 47 | 13.20% | 1 | 14.29% |
| Christian Dietrich | 2 | 0.56% | 1 | 14.29% |
| Laura Garcia Liebana | 2 | 0.56% | 1 | 14.29% |
| Aybuke Ozdemir | 1 | 0.28% | 1 | 14.29% |
| Gulsah Kose | 1 | 0.28% | 1 | 14.29% |
| Justin P. Mattock | 1 | 0.28% | 1 | 14.29% |
| Total | 356 | 100.00% | 7 | 100.00% |
static int cvm_oct_poll(struct oct_rx_group *rx_group, int budget)
{
const int coreid = cvmx_get_core_num();
u64 old_group_mask;
u64 old_scratch;
int rx_count = 0;
int did_work_request = 0;
int packet_not_copied;
/* Prefetch cvm_oct_device since we know we need it soon */
prefetch(cvm_oct_device);
if (USE_ASYNC_IOBDMA) {
/* Save scratch in case userspace is using it */
CVMX_SYNCIOBDMA;
old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
}
/* Only allow work for our group (and preserve priorities) */
if (OCTEON_IS_MODEL(OCTEON_CN68XX)) {
old_group_mask = cvmx_read_csr(CVMX_SSO_PPX_GRP_MSK(coreid));
cvmx_write_csr(CVMX_SSO_PPX_GRP_MSK(coreid),
BIT(rx_group->group));
cvmx_read_csr(CVMX_SSO_PPX_GRP_MSK(coreid)); /* Flush */
} else {
old_group_mask = cvmx_read_csr(CVMX_POW_PP_GRP_MSKX(coreid));
cvmx_write_csr(CVMX_POW_PP_GRP_MSKX(coreid),
(old_group_mask & ~0xFFFFull) |
BIT(rx_group->group));
}
if (USE_ASYNC_IOBDMA) {
cvmx_pow_work_request_async(CVMX_SCR_SCRATCH, CVMX_POW_NO_WAIT);
did_work_request = 1;
}
while (rx_count < budget) {
struct sk_buff *skb = NULL;
struct sk_buff **pskb = NULL;
int skb_in_hw;
cvmx_wqe_t *work;
int port;
if (USE_ASYNC_IOBDMA && did_work_request)
work = cvmx_pow_work_response_async(CVMX_SCR_SCRATCH);
else
work = cvmx_pow_work_request_sync(CVMX_POW_NO_WAIT);
prefetch(work);
did_work_request = 0;
if (!work) {
if (OCTEON_IS_MODEL(OCTEON_CN68XX)) {
cvmx_write_csr(CVMX_SSO_WQ_IQ_DIS,
BIT(rx_group->group));
cvmx_write_csr(CVMX_SSO_WQ_INT,
BIT(rx_group->group));
} else {
union cvmx_pow_wq_int wq_int;
wq_int.u64 = 0;
wq_int.s.iq_dis = BIT(rx_group->group);
wq_int.s.wq_int = BIT(rx_group->group);
cvmx_write_csr(CVMX_POW_WQ_INT, wq_int.u64);
}
break;
}
pskb = (struct sk_buff **)
(cvm_oct_get_buffer_ptr(work->packet_ptr) -
sizeof(void *));
prefetch(pskb);
if (USE_ASYNC_IOBDMA && rx_count < (budget - 1)) {
cvmx_pow_work_request_async_nocheck(CVMX_SCR_SCRATCH,
CVMX_POW_NO_WAIT);
did_work_request = 1;
}
rx_count++;
skb_in_hw = work->word2.s.bufs == 1;
if (likely(skb_in_hw)) {
skb = *pskb;
prefetch(&skb->head);
prefetch(&skb->len);
}
if (octeon_has_feature(OCTEON_FEATURE_PKND))
port = work->word0.pip.cn68xx.pknd;
else
port = work->word1.cn38xx.ipprt;
prefetch(cvm_oct_device[port]);
/* Immediately throw away all packets with receive errors */
if (unlikely(work->word2.snoip.rcv_error)) {
if (cvm_oct_check_rcv_error(work))
continue;
}
/*
* We can only use the zero copy path if skbuffs are
* in the FPA pool and the packet fits in a single
* buffer.
*/
if (likely(skb_in_hw)) {
skb->data = skb->head + work->packet_ptr.s.addr -
cvmx_ptr_to_phys(skb->head);
prefetch(skb->data);
skb->len = work->word1.len;
skb_set_tail_pointer(skb, skb->len);
packet_not_copied = 1;
} else {
/*
* We have to copy the packet. First allocate
* an skbuff for it.
*/
skb = dev_alloc_skb(work->word1.len);
if (!skb) {
cvm_oct_free_work(work);
continue;
}
/*
* Check if we've received a packet that was
* entirely stored in the work entry.
*/
if (unlikely(work->word2.s.bufs == 0)) {
u8 *ptr = work->packet_data;
if (likely(!work->word2.s.not_IP)) {
/*
* The beginning of the packet
* moves for IP packets.
*/
if (work->word2.s.is_v6)
ptr += 2;
else
ptr += 6;
}
memcpy(skb_put(skb, work->word1.len), ptr,
work->word1.len);
/* No packet buffers to free */
} else {
int segments = work->word2.s.bufs;
union cvmx_buf_ptr segment_ptr =
work->packet_ptr;
int len = work->word1.len;
while (segments--) {
union cvmx_buf_ptr next_ptr =
*(union cvmx_buf_ptr *)
cvmx_phys_to_ptr(
segment_ptr.s.addr - 8);
/*
* Octeon Errata PKI-100: The segment size is
* wrong. Until it is fixed, calculate the
* segment size based on the packet pool
* buffer size. When it is fixed, the
* following line should be replaced with this
* one: int segment_size =
* segment_ptr.s.size;
*/
int segment_size =
CVMX_FPA_PACKET_POOL_SIZE -
(segment_ptr.s.addr -
(((segment_ptr.s.addr >> 7) -
segment_ptr.s.back) << 7));
/*
* Don't copy more than what
* is left in the packet.
*/
if (segment_size > len)
segment_size = len;
/* Copy the data into the packet */
memcpy(skb_put(skb, segment_size),
cvmx_phys_to_ptr(
segment_ptr.s.addr),
segment_size);
len -= segment_size;
segment_ptr = next_ptr;
}
}
packet_not_copied = 0;
}
if (likely((port < TOTAL_NUMBER_OF_PORTS) &&
cvm_oct_device[port])) {
struct net_device *dev = cvm_oct_device[port];
/*
* Only accept packets for devices that are
* currently up.
*/
if (likely(dev->flags & IFF_UP)) {
skb->protocol = eth_type_trans(skb, dev);
skb->dev = dev;
if (unlikely(work->word2.s.not_IP ||
work->word2.s.IP_exc ||
work->word2.s.L4_error ||
!work->word2.s.tcp_or_udp))
skb->ip_summed = CHECKSUM_NONE;
else
skb->ip_summed = CHECKSUM_UNNECESSARY;
/* Increment RX stats for virtual ports */
if (port >= CVMX_PIP_NUM_INPUT_PORTS) {
dev->stats.rx_packets++;
dev->stats.rx_bytes += skb->len;
}
netif_receive_skb(skb);
} else {
/*
* Drop any packet received for a device that
* isn't up.
*/
dev->stats.rx_dropped++;
dev_kfree_skb_irq(skb);
}
} else {
/*
* Drop any packet received for a device that
* doesn't exist.
*/
printk_ratelimited("Port %d not controlled by Linux, packet dropped\n",
port);
dev_kfree_skb_irq(skb);
}
/*
* Check to see if the skbuff and work share the same
* packet buffer.
*/
if (likely(packet_not_copied)) {
/*
* This buffer needs to be replaced, increment
* the number of buffers we need to free by
* one.
*/
cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE,
1);
cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
} else {
cvm_oct_free_work(work);
}
}
/* Restore the original POW group mask */
if (OCTEON_IS_MODEL(OCTEON_CN68XX)) {
cvmx_write_csr(CVMX_SSO_PPX_GRP_MSK(coreid), old_group_mask);
cvmx_read_csr(CVMX_SSO_PPX_GRP_MSK(coreid)); /* Flush */
} else {
cvmx_write_csr(CVMX_POW_PP_GRP_MSKX(coreid), old_group_mask);
}
if (USE_ASYNC_IOBDMA) {
/* Restore the scratch area */
cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
}
cvm_oct_rx_refill_pool(0);
return rx_count;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Daney | 844 | 79.77% | 3 | 18.75% |
| Aaro Koskinen | 147 | 13.89% | 6 | 37.50% |
| Janne Huttunen | 49 | 4.63% | 1 | 6.25% |
| Roy Li | 9 | 0.85% | 1 | 6.25% |
| Tobias Klauser | 3 | 0.28% | 1 | 6.25% |
| Aybuke Ozdemir | 3 | 0.28% | 1 | 6.25% |
| Laura Garcia Liebana | 2 | 0.19% | 2 | 12.50% |
| Christian Dietrich | 1 | 0.09% | 1 | 6.25% |
| Total | 1058 | 100.00% | 16 | 100.00% |
/**
* cvm_oct_napi_poll - the NAPI poll function.
* @napi: The NAPI instance.
* @budget: Maximum number of packets to receive.
*
* Returns the number of packets processed.
*/
static int cvm_oct_napi_poll(struct napi_struct *napi, int budget)
{
struct oct_rx_group *rx_group = container_of(napi, struct oct_rx_group,
napi);
int rx_count;
rx_count = cvm_oct_poll(rx_group, budget);
if (rx_count < budget) {
/* No more work */
napi_complete_done(napi, rx_count);
enable_irq(rx_group->irq);
}
return rx_count;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Aaro Koskinen | 46 | 68.66% | 4 | 57.14% |
| David Daney | 18 | 26.87% | 2 | 28.57% |
| Eric Dumazet | 3 | 4.48% | 1 | 14.29% |
| Total | 67 | 100.00% | 7 | 100.00% |
#ifdef CONFIG_NET_POLL_CONTROLLER
/**
* cvm_oct_poll_controller - poll for receive packets
* device.
*
* @dev: Device to poll. Unused
*/
void cvm_oct_poll_controller(struct net_device *dev)
{
int i;
if (!atomic_read(&oct_rx_ready))
return;
for (i = 0; i < ARRAY_SIZE(oct_rx_group); i++) {
if (!(pow_receive_groups & BIT(i)))
continue;
cvm_oct_poll(&oct_rx_group[i], 16);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Aaro Koskinen | 51 | 78.46% | 4 | 66.67% |
| David Daney | 14 | 21.54% | 2 | 33.33% |
| Total | 65 | 100.00% | 6 | 100.00% |
#endif
void cvm_oct_rx_initialize(void)
{
int i;
struct net_device *dev_for_napi = NULL;
for (i = 0; i < TOTAL_NUMBER_OF_PORTS; i++) {
if (cvm_oct_device[i]) {
dev_for_napi = cvm_oct_device[i];
break;
}
}
if (!dev_for_napi)
panic("No net_devices were allocated.");
for (i = 0; i < ARRAY_SIZE(oct_rx_group); i++) {
int ret;
if (!(pow_receive_groups & BIT(i)))
continue;
netif_napi_add(dev_for_napi, &oct_rx_group[i].napi,
cvm_oct_napi_poll, rx_napi_weight);
napi_enable(&oct_rx_group[i].napi);
oct_rx_group[i].irq = OCTEON_IRQ_WORKQ0 + i;
oct_rx_group[i].group = i;
/* Register an IRQ handler to receive POW interrupts */
ret = request_irq(oct_rx_group[i].irq, cvm_oct_do_interrupt, 0,
"Ethernet", &oct_rx_group[i].napi);
if (ret)
panic("Could not acquire Ethernet IRQ %d\n",
oct_rx_group[i].irq);
disable_irq_nosync(oct_rx_group[i].irq);
/* Enable POW interrupt when our port has at least one packet */
if (OCTEON_IS_MODEL(OCTEON_CN68XX)) {
union cvmx_sso_wq_int_thrx int_thr;
union cvmx_pow_wq_int_pc int_pc;
int_thr.u64 = 0;
int_thr.s.tc_en = 1;
int_thr.s.tc_thr = 1;
cvmx_write_csr(CVMX_SSO_WQ_INT_THRX(i), int_thr.u64);
int_pc.u64 = 0;
int_pc.s.pc_thr = 5;
cvmx_write_csr(CVMX_SSO_WQ_INT_PC, int_pc.u64);
} else {
union cvmx_pow_wq_int_thrx int_thr;
union cvmx_pow_wq_int_pc int_pc;
int_thr.u64 = 0;
int_thr.s.tc_en = 1;
int_thr.s.tc_thr = 1;
cvmx_write_csr(CVMX_POW_WQ_INT_THRX(i), int_thr.u64);
int_pc.u64 = 0;
int_pc.s.pc_thr = 5;
cvmx_write_csr(CVMX_POW_WQ_INT_PC, int_pc.u64);
}
/* Schedule NAPI now. This will indirectly enable the
* interrupt.
*/
napi_schedule(&oct_rx_group[i].napi);
}
atomic_inc(&oct_rx_ready);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Aaro Koskinen | 197 | 55.49% | 8 | 66.67% |
| David Daney | 156 | 43.94% | 2 | 16.67% |
| Laura Garcia Liebana | 1 | 0.28% | 1 | 8.33% |
| Masanari Iida | 1 | 0.28% | 1 | 8.33% |
| Total | 355 | 100.00% | 12 | 100.00% |
void cvm_oct_rx_shutdown(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(oct_rx_group); i++) {
if (!(pow_receive_groups & BIT(i)))
continue;
/* Disable POW interrupt */
if (OCTEON_IS_MODEL(OCTEON_CN68XX))
cvmx_write_csr(CVMX_SSO_WQ_INT_THRX(i), 0);
else
cvmx_write_csr(CVMX_POW_WQ_INT_THRX(i), 0);
/* Free the interrupt handler */
free_irq(oct_rx_group[i].irq, cvm_oct_device);
netif_napi_del(&oct_rx_group[i].napi);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Aaro Koskinen | 82 | 87.23% | 4 | 66.67% |
| David Daney | 12 | 12.77% | 2 | 33.33% |
| Total | 94 | 100.00% | 6 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Daney | 1462 | 67.97% | 5 | 15.62% |
| Aaro Koskinen | 557 | 25.89% | 15 | 46.88% |
| Janne Huttunen | 96 | 4.46% | 1 | 3.12% |
| Roy Li | 9 | 0.42% | 1 | 3.12% |
| Christian Dietrich | 6 | 0.28% | 1 | 3.12% |
| Laura Garcia Liebana | 5 | 0.23% | 2 | 6.25% |
| Aybuke Ozdemir | 4 | 0.19% | 1 | 3.12% |
| Tobias Klauser | 3 | 0.14% | 1 | 3.12% |
| Imre Kaloz | 3 | 0.14% | 1 | 3.12% |
| Eric Dumazet | 3 | 0.14% | 1 | 3.12% |
| Masanari Iida | 1 | 0.05% | 1 | 3.12% |
| Gulsah Kose | 1 | 0.05% | 1 | 3.12% |
| Justin P. Mattock | 1 | 0.05% | 1 | 3.12% |
| Total | 2151 | 100.00% | 32 | 100.00% |
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