715 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * This file is based on code from OCTEON SDK by Cavium Networks.4 *5 * Copyright (c) 2003-2010 Cavium Networks6 */7 8#include <linux/module.h>9#include <linux/kernel.h>10#include <linux/netdevice.h>11#include <linux/etherdevice.h>12#include <linux/ip.h>13#include <linux/ratelimit.h>14#include <linux/string.h>15#include <linux/interrupt.h>16#include <net/dst.h>17#ifdef CONFIG_XFRM18#include <linux/xfrm.h>19#include <net/xfrm.h>20#endif /* CONFIG_XFRM */21 22#include <linux/atomic.h>23#include <net/sch_generic.h>24 25#include "octeon-ethernet.h"26#include "ethernet-defines.h"27#include "ethernet-tx.h"28#include "ethernet-util.h"29 30#define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb))31 32/*33 * You can define GET_SKBUFF_QOS() to override how the skbuff output34 * function determines which output queue is used. The default35 * implementation always uses the base queue for the port. If, for36 * example, you wanted to use the skb->priority field, define37 * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)38 */39#ifndef GET_SKBUFF_QOS40#define GET_SKBUFF_QOS(skb) 041#endif42 43static void cvm_oct_tx_do_cleanup(unsigned long arg);44static DECLARE_TASKLET_OLD(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup);45 46/* Maximum number of SKBs to try to free per xmit packet. */47#define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)48 49static inline int cvm_oct_adjust_skb_to_free(int skb_to_free, int fau)50{51 int undo;52 53 undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free +54 MAX_SKB_TO_FREE;55 if (undo > 0)56 cvmx_fau_atomic_add32(fau, -undo);57 skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE :58 -skb_to_free;59 return skb_to_free;60}61 62static void cvm_oct_kick_tx_poll_watchdog(void)63{64 union cvmx_ciu_timx ciu_timx;65 66 ciu_timx.u64 = 0;67 ciu_timx.s.one_shot = 1;68 ciu_timx.s.len = cvm_oct_tx_poll_interval;69 cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);70}71 72static void cvm_oct_free_tx_skbs(struct net_device *dev)73{74 int skb_to_free;75 int qos, queues_per_port;76 int total_remaining = 0;77 unsigned long flags;78 struct octeon_ethernet *priv = netdev_priv(dev);79 80 queues_per_port = cvmx_pko_get_num_queues(priv->port);81 /* Drain any pending packets in the free list */82 for (qos = 0; qos < queues_per_port; qos++) {83 if (skb_queue_len(&priv->tx_free_list[qos]) == 0)84 continue;85 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,86 MAX_SKB_TO_FREE);87 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,88 priv->fau + qos * 4);89 if (skb_to_free > 0) {90 struct sk_buff *to_free_list = NULL;91 92 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);93 while (skb_to_free > 0) {94 struct sk_buff *t;95 96 t = __skb_dequeue(&priv->tx_free_list[qos]);97 t->next = to_free_list;98 to_free_list = t;99 skb_to_free--;100 }101 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,102 flags);103 /* Do the actual freeing outside of the lock. */104 while (to_free_list) {105 struct sk_buff *t = to_free_list;106 107 to_free_list = to_free_list->next;108 dev_kfree_skb_any(t);109 }110 }111 total_remaining += skb_queue_len(&priv->tx_free_list[qos]);112 }113 if (total_remaining < MAX_OUT_QUEUE_DEPTH && netif_queue_stopped(dev))114 netif_wake_queue(dev);115 if (total_remaining)116 cvm_oct_kick_tx_poll_watchdog();117}118 119/**120 * cvm_oct_xmit - transmit a packet121 * @skb: Packet to send122 * @dev: Device info structure123 *124 * Returns Always returns NETDEV_TX_OK125 */126netdev_tx_t cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)127{128 union cvmx_pko_command_word0 pko_command;129 union cvmx_buf_ptr hw_buffer;130 u64 old_scratch;131 u64 old_scratch2;132 int qos;133 int i;134 enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;135 struct octeon_ethernet *priv = netdev_priv(dev);136 struct sk_buff *to_free_list;137 int skb_to_free;138 int buffers_to_free;139 u32 total_to_clean;140 unsigned long flags;141#if REUSE_SKBUFFS_WITHOUT_FREE142 unsigned char *fpa_head;143#endif144 145 /*146 * Prefetch the private data structure. It is larger than the147 * one cache line.148 */149 prefetch(priv);150 151 /*152 * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to153 * completely remove "qos" in the event neither interface154 * supports multiple queues per port.155 */156 if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||157 (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {158 qos = GET_SKBUFF_QOS(skb);159 if (qos <= 0)160 qos = 0;161 else if (qos >= cvmx_pko_get_num_queues(priv->port))162 qos = 0;163 } else {164 qos = 0;165 }166 167 if (USE_ASYNC_IOBDMA) {168 /* Save scratch in case userspace is using it */169 CVMX_SYNCIOBDMA;170 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);171 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);172 173 /*174 * Fetch and increment the number of packets to be175 * freed.176 */177 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,178 FAU_NUM_PACKET_BUFFERS_TO_FREE,179 0);180 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,181 priv->fau + qos * 4,182 MAX_SKB_TO_FREE);183 }184 185 /*186 * We have space for 6 segment pointers, If there will be more187 * than that, we must linearize.188 */189 if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {190 if (unlikely(__skb_linearize(skb))) {191 queue_type = QUEUE_DROP;192 if (USE_ASYNC_IOBDMA) {193 /*194 * Get the number of skbuffs in use195 * by the hardware196 */197 CVMX_SYNCIOBDMA;198 skb_to_free =199 cvmx_scratch_read64(CVMX_SCR_SCRATCH);200 } else {201 /*202 * Get the number of skbuffs in use203 * by the hardware204 */205 skb_to_free =206 cvmx_fau_fetch_and_add32(priv->fau +207 qos * 4,208 MAX_SKB_TO_FREE);209 }210 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,211 priv->fau +212 qos * 4);213 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);214 goto skip_xmit;215 }216 }217 218 /*219 * The CN3XXX series of parts has an errata (GMX-401) which220 * causes the GMX block to hang if a collision occurs towards221 * the end of a <68 byte packet. As a workaround for this, we222 * pad packets to be 68 bytes whenever we are in half duplex223 * mode. We don't handle the case of having a small packet but224 * no room to add the padding. The kernel should always give225 * us at least a cache line226 */227 if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {228 union cvmx_gmxx_prtx_cfg gmx_prt_cfg;229 int interface = INTERFACE(priv->port);230 int index = INDEX(priv->port);231 232 if (interface < 2) {233 /* We only need to pad packet in half duplex mode */234 gmx_prt_cfg.u64 =235 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));236 if (gmx_prt_cfg.s.duplex == 0) {237 int add_bytes = 64 - skb->len;238 239 if ((skb_tail_pointer(skb) + add_bytes) <=240 skb_end_pointer(skb))241 __skb_put_zero(skb, add_bytes);242 }243 }244 }245 246 /* Build the PKO command */247 pko_command.u64 = 0;248#ifdef __LITTLE_ENDIAN249 pko_command.s.le = 1;250#endif251 pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */252 pko_command.s.segs = 1;253 pko_command.s.total_bytes = skb->len;254 pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;255 pko_command.s.subone0 = 1;256 257 pko_command.s.dontfree = 1;258 259 /* Build the PKO buffer pointer */260 hw_buffer.u64 = 0;261 if (skb_shinfo(skb)->nr_frags == 0) {262 hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);263 hw_buffer.s.pool = 0;264 hw_buffer.s.size = skb->len;265 } else {266 hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);267 hw_buffer.s.pool = 0;268 hw_buffer.s.size = skb_headlen(skb);269 CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;270 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {271 skb_frag_t *fs = skb_shinfo(skb)->frags + i;272 273 hw_buffer.s.addr =274 XKPHYS_TO_PHYS((uintptr_t)skb_frag_address(fs));275 hw_buffer.s.size = skb_frag_size(fs);276 CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;277 }278 hw_buffer.s.addr =279 XKPHYS_TO_PHYS((uintptr_t)CVM_OCT_SKB_CB(skb));280 hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;281 pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;282 pko_command.s.gather = 1;283 goto dont_put_skbuff_in_hw;284 }285 286 /*287 * See if we can put this skb in the FPA pool. Any strange288 * behavior from the Linux networking stack will most likely289 * be caused by a bug in the following code. If some field is290 * in use by the network stack and gets carried over when a291 * buffer is reused, bad things may happen. If in doubt and292 * you dont need the absolute best performance, disable the293 * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has294 * shown a 25% increase in performance under some loads.295 */296#if REUSE_SKBUFFS_WITHOUT_FREE297 fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);298 if (unlikely(skb->data < fpa_head)) {299 /* TX buffer beginning can't meet FPA alignment constraints */300 goto dont_put_skbuff_in_hw;301 }302 if (unlikely303 ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {304 /* TX buffer isn't large enough for the FPA */305 goto dont_put_skbuff_in_hw;306 }307 if (unlikely(skb_shared(skb))) {308 /* TX buffer sharing data with someone else */309 goto dont_put_skbuff_in_hw;310 }311 if (unlikely(skb_cloned(skb))) {312 /* TX buffer has been cloned */313 goto dont_put_skbuff_in_hw;314 }315 if (unlikely(skb_header_cloned(skb))) {316 /* TX buffer header has been cloned */317 goto dont_put_skbuff_in_hw;318 }319 if (unlikely(skb->destructor)) {320 /* TX buffer has a destructor */321 goto dont_put_skbuff_in_hw;322 }323 if (unlikely(skb_shinfo(skb)->nr_frags)) {324 /* TX buffer has fragments */325 goto dont_put_skbuff_in_hw;326 }327 if (unlikely328 (skb->truesize !=329 sizeof(*skb) + skb_end_offset(skb))) {330 /* TX buffer truesize has been changed */331 goto dont_put_skbuff_in_hw;332 }333 334 /*335 * We can use this buffer in the FPA. We don't need the FAU336 * update anymore337 */338 pko_command.s.dontfree = 0;339 340 hw_buffer.s.back = ((unsigned long)skb->data >> 7) -341 ((unsigned long)fpa_head >> 7);342 343 *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;344 345 /*346 * The skbuff will be reused without ever being freed. We must347 * cleanup a bunch of core things.348 */349 dst_release(skb_dst(skb));350 skb_dst_set(skb, NULL);351 skb_ext_reset(skb);352 nf_reset_ct(skb);353 skb_reset_redirect(skb);354 355#ifdef CONFIG_NET_SCHED356 skb->tc_index = 0;357#endif /* CONFIG_NET_SCHED */358#endif /* REUSE_SKBUFFS_WITHOUT_FREE */359 360dont_put_skbuff_in_hw:361 362 /* Check if we can use the hardware checksumming */363 if ((skb->protocol == htons(ETH_P_IP)) &&364 (ip_hdr(skb)->version == 4) &&365 (ip_hdr(skb)->ihl == 5) &&366 ((ip_hdr(skb)->frag_off == 0) ||367 (ip_hdr(skb)->frag_off == htons(1 << 14))) &&368 ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||369 (ip_hdr(skb)->protocol == IPPROTO_UDP))) {370 /* Use hardware checksum calc */371 pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;372 }373 374 if (USE_ASYNC_IOBDMA) {375 /* Get the number of skbuffs in use by the hardware */376 CVMX_SYNCIOBDMA;377 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);378 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);379 } else {380 /* Get the number of skbuffs in use by the hardware */381 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,382 MAX_SKB_TO_FREE);383 buffers_to_free =384 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);385 }386 387 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,388 priv->fau + qos * 4);389 390 /*391 * If we're sending faster than the receive can free them then392 * don't do the HW free.393 */394 if ((buffers_to_free < -100) && !pko_command.s.dontfree)395 pko_command.s.dontfree = 1;396 397 if (pko_command.s.dontfree) {398 queue_type = QUEUE_CORE;399 pko_command.s.reg0 = priv->fau + qos * 4;400 } else {401 queue_type = QUEUE_HW;402 }403 if (USE_ASYNC_IOBDMA)404 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,405 FAU_TOTAL_TX_TO_CLEAN, 1);406 407 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);408 409 /* Drop this packet if we have too many already queued to the HW */410 if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=411 MAX_OUT_QUEUE_DEPTH)) {412 if (dev->tx_queue_len != 0) {413 /* Drop the lock when notifying the core. */414 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,415 flags);416 netif_stop_queue(dev);417 spin_lock_irqsave(&priv->tx_free_list[qos].lock,418 flags);419 } else {420 /* If not using normal queueing. */421 queue_type = QUEUE_DROP;422 goto skip_xmit;423 }424 }425 426 cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,427 CVMX_PKO_LOCK_NONE);428 429 /* Send the packet to the output queue */430 if (unlikely(cvmx_pko_send_packet_finish(priv->port,431 priv->queue + qos,432 pko_command, hw_buffer,433 CVMX_PKO_LOCK_NONE))) {434 printk_ratelimited("%s: Failed to send the packet\n",435 dev->name);436 queue_type = QUEUE_DROP;437 }438skip_xmit:439 to_free_list = NULL;440 441 switch (queue_type) {442 case QUEUE_DROP:443 skb->next = to_free_list;444 to_free_list = skb;445 dev->stats.tx_dropped++;446 break;447 case QUEUE_HW:448 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);449 break;450 case QUEUE_CORE:451 __skb_queue_tail(&priv->tx_free_list[qos], skb);452 break;453 default:454 BUG();455 }456 457 while (skb_to_free > 0) {458 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);459 460 t->next = to_free_list;461 to_free_list = t;462 skb_to_free--;463 }464 465 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);466 467 /* Do the actual freeing outside of the lock. */468 while (to_free_list) {469 struct sk_buff *t = to_free_list;470 471 to_free_list = to_free_list->next;472 dev_kfree_skb_any(t);473 }474 475 if (USE_ASYNC_IOBDMA) {476 CVMX_SYNCIOBDMA;477 total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);478 /* Restore the scratch area */479 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);480 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);481 } else {482 total_to_clean =483 cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, 1);484 }485 486 if (total_to_clean & 0x3ff) {487 /*488 * Schedule the cleanup tasklet every 1024 packets for489 * the pathological case of high traffic on one port490 * delaying clean up of packets on a different port491 * that is blocked waiting for the cleanup.492 */493 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);494 }495 496 cvm_oct_kick_tx_poll_watchdog();497 498 return NETDEV_TX_OK;499}500 501/**502 * cvm_oct_xmit_pow - transmit a packet to the POW503 * @skb: Packet to send504 * @dev: Device info structure505 * Returns Always returns zero506 */507netdev_tx_t cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)508{509 struct octeon_ethernet *priv = netdev_priv(dev);510 void *packet_buffer;511 void *copy_location;512 513 /* Get a work queue entry */514 struct cvmx_wqe *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);515 516 if (unlikely(!work)) {517 printk_ratelimited("%s: Failed to allocate a work queue entry\n",518 dev->name);519 dev->stats.tx_dropped++;520 dev_kfree_skb_any(skb);521 return 0;522 }523 524 /* Get a packet buffer */525 packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);526 if (unlikely(!packet_buffer)) {527 printk_ratelimited("%s: Failed to allocate a packet buffer\n",528 dev->name);529 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);530 dev->stats.tx_dropped++;531 dev_kfree_skb_any(skb);532 return 0;533 }534 535 /*536 * Calculate where we need to copy the data to. We need to537 * leave 8 bytes for a next pointer (unused). We also need to538 * include any configure skip. Then we need to align the IP539 * packet src and dest into the same 64bit word. The below540 * calculation may add a little extra, but that doesn't541 * hurt.542 */543 copy_location = packet_buffer + sizeof(u64);544 copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;545 546 /*547 * We have to copy the packet since whoever processes this548 * packet will free it to a hardware pool. We can't use the549 * trick of counting outstanding packets like in550 * cvm_oct_xmit.551 */552 memcpy(copy_location, skb->data, skb->len);553 554 /*555 * Fill in some of the work queue fields. We may need to add556 * more if the software at the other end needs them.557 */558 if (!OCTEON_IS_MODEL(OCTEON_CN68XX))559 work->word0.pip.cn38xx.hw_chksum = skb->csum;560 work->word1.len = skb->len;561 cvmx_wqe_set_port(work, priv->port);562 cvmx_wqe_set_qos(work, priv->port & 0x7);563 cvmx_wqe_set_grp(work, pow_send_group);564 work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;565 work->word1.tag = pow_send_group; /* FIXME */566 /* Default to zero. Sets of zero later are commented out */567 work->word2.u64 = 0;568 work->word2.s.bufs = 1;569 work->packet_ptr.u64 = 0;570 work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);571 work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;572 work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;573 work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;574 575 if (skb->protocol == htons(ETH_P_IP)) {576 work->word2.s.ip_offset = 14;577#if 0578 work->word2.s.vlan_valid = 0; /* FIXME */579 work->word2.s.vlan_cfi = 0; /* FIXME */580 work->word2.s.vlan_id = 0; /* FIXME */581 work->word2.s.dec_ipcomp = 0; /* FIXME */582#endif583 work->word2.s.tcp_or_udp =584 (ip_hdr(skb)->protocol == IPPROTO_TCP) ||585 (ip_hdr(skb)->protocol == IPPROTO_UDP);586#if 0587 /* FIXME */588 work->word2.s.dec_ipsec = 0;589 /* We only support IPv4 right now */590 work->word2.s.is_v6 = 0;591 /* Hardware would set to zero */592 work->word2.s.software = 0;593 /* No error, packet is internal */594 work->word2.s.L4_error = 0;595#endif596 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||597 (ip_hdr(skb)->frag_off ==598 cpu_to_be16(1 << 14)));599#if 0600 /* Assume Linux is sending a good packet */601 work->word2.s.IP_exc = 0;602#endif603 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);604 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);605#if 0606 /* This is an IP packet */607 work->word2.s.not_IP = 0;608 /* No error, packet is internal */609 work->word2.s.rcv_error = 0;610 /* No error, packet is internal */611 work->word2.s.err_code = 0;612#endif613 614 /*615 * When copying the data, include 4 bytes of the616 * ethernet header to align the same way hardware617 * does.618 */619 memcpy(work->packet_data, skb->data + 10,620 sizeof(work->packet_data));621 } else {622#if 0623 work->word2.snoip.vlan_valid = 0; /* FIXME */624 work->word2.snoip.vlan_cfi = 0; /* FIXME */625 work->word2.snoip.vlan_id = 0; /* FIXME */626 work->word2.snoip.software = 0; /* Hardware would set to zero */627#endif628 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);629 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);630 work->word2.snoip.is_bcast =631 (skb->pkt_type == PACKET_BROADCAST);632 work->word2.snoip.is_mcast =633 (skb->pkt_type == PACKET_MULTICAST);634 work->word2.snoip.not_IP = 1; /* IP was done up above */635#if 0636 /* No error, packet is internal */637 work->word2.snoip.rcv_error = 0;638 /* No error, packet is internal */639 work->word2.snoip.err_code = 0;640#endif641 memcpy(work->packet_data, skb->data, sizeof(work->packet_data));642 }643 644 /* Submit the packet to the POW */645 cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,646 cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));647 dev->stats.tx_packets++;648 dev->stats.tx_bytes += skb->len;649 dev_consume_skb_any(skb);650 return 0;651}652 653/**654 * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.655 * @dev: Device being shutdown656 *657 */658void cvm_oct_tx_shutdown_dev(struct net_device *dev)659{660 struct octeon_ethernet *priv = netdev_priv(dev);661 unsigned long flags;662 int qos;663 664 for (qos = 0; qos < 16; qos++) {665 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);666 while (skb_queue_len(&priv->tx_free_list[qos]))667 dev_kfree_skb_any(__skb_dequeue668 (&priv->tx_free_list[qos]));669 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);670 }671}672 673static void cvm_oct_tx_do_cleanup(unsigned long arg)674{675 int port;676 677 for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {678 if (cvm_oct_device[port]) {679 struct net_device *dev = cvm_oct_device[port];680 681 cvm_oct_free_tx_skbs(dev);682 }683 }684}685 686static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)687{688 /* Disable the interrupt. */689 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);690 /* Do the work in the tasklet. */691 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);692 return IRQ_HANDLED;693}694 695void cvm_oct_tx_initialize(void)696{697 int i;698 699 /* Disable the interrupt. */700 cvmx_write_csr(CVMX_CIU_TIMX(1), 0);701 /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */702 i = request_irq(OCTEON_IRQ_TIMER1,703 cvm_oct_tx_cleanup_watchdog, 0,704 "Ethernet", cvm_oct_device);705 706 if (i)707 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);708}709 710void cvm_oct_tx_shutdown(void)711{712 /* Free the interrupt handler */713 free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);714}715