1/* 2 * This file is based on code from OCTEON SDK by Cavium Networks. 3 * 4 * Copyright (c) 2003-2010 Cavium Networks 5 * 6 * This file is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License, Version 2, as 8 * published by the Free Software Foundation. 9 */ 10 11#include <linux/module.h> 12#include <linux/kernel.h> 13#include <linux/netdevice.h> 14#include <linux/etherdevice.h> 15#include <linux/ip.h> 16#include <linux/ratelimit.h> 17#include <linux/string.h> 18#include <linux/interrupt.h> 19#include <net/dst.h> 20#ifdef CONFIG_XFRM 21#include <linux/xfrm.h> 22#include <net/xfrm.h> 23#endif /* CONFIG_XFRM */ 24 25#include <linux/atomic.h> 26 27#include <asm/octeon/octeon.h> 28 29#include "ethernet-defines.h" 30#include "octeon-ethernet.h" 31#include "ethernet-tx.h" 32#include "ethernet-util.h" 33 34#include <asm/octeon/cvmx-wqe.h> 35#include <asm/octeon/cvmx-fau.h> 36#include <asm/octeon/cvmx-pip.h> 37#include <asm/octeon/cvmx-pko.h> 38#include <asm/octeon/cvmx-helper.h> 39 40#include <asm/octeon/cvmx-gmxx-defs.h> 41 42#define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb)) 43 44/* 45 * You can define GET_SKBUFF_QOS() to override how the skbuff output 46 * function determines which output queue is used. The default 47 * implementation always uses the base queue for the port. If, for 48 * example, you wanted to use the skb->priority field, define 49 * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority) 50 */ 51#ifndef GET_SKBUFF_QOS 52#define GET_SKBUFF_QOS(skb) 0 53#endif 54 55static void cvm_oct_tx_do_cleanup(unsigned long arg); 56static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0); 57 58/* Maximum number of SKBs to try to free per xmit packet. */ 59#define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2) 60 61static inline int32_t cvm_oct_adjust_skb_to_free(int32_t skb_to_free, int fau) 62{ 63 int32_t undo; 64 65 undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free + 66 MAX_SKB_TO_FREE; 67 if (undo > 0) 68 cvmx_fau_atomic_add32(fau, -undo); 69 skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE : 70 -skb_to_free; 71 return skb_to_free; 72} 73 74static void cvm_oct_kick_tx_poll_watchdog(void) 75{ 76 union cvmx_ciu_timx ciu_timx; 77 78 ciu_timx.u64 = 0; 79 ciu_timx.s.one_shot = 1; 80 ciu_timx.s.len = cvm_oct_tx_poll_interval; 81 cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64); 82} 83 84static void cvm_oct_free_tx_skbs(struct net_device *dev) 85{ 86 int32_t skb_to_free; 87 int qos, queues_per_port; 88 int total_freed = 0; 89 int total_remaining = 0; 90 unsigned long flags; 91 struct octeon_ethernet *priv = netdev_priv(dev); 92 93 queues_per_port = cvmx_pko_get_num_queues(priv->port); 94 /* Drain any pending packets in the free list */ 95 for (qos = 0; qos < queues_per_port; qos++) { 96 if (skb_queue_len(&priv->tx_free_list[qos]) == 0) 97 continue; 98 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau+qos*4, 99 MAX_SKB_TO_FREE); 100 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, 101 priv->fau+qos*4); 102 103 104 total_freed += skb_to_free; 105 if (skb_to_free > 0) { 106 struct sk_buff *to_free_list = NULL; 107 108 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); 109 while (skb_to_free > 0) { 110 struct sk_buff *t; 111 112 t = __skb_dequeue(&priv->tx_free_list[qos]); 113 t->next = to_free_list; 114 to_free_list = t; 115 skb_to_free--; 116 } 117 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, 118 flags); 119 /* Do the actual freeing outside of the lock. */ 120 while (to_free_list) { 121 struct sk_buff *t = to_free_list; 122 123 to_free_list = to_free_list->next; 124 dev_kfree_skb_any(t); 125 } 126 } 127 total_remaining += skb_queue_len(&priv->tx_free_list[qos]); 128 } 129 if (total_freed >= 0 && netif_queue_stopped(dev)) 130 netif_wake_queue(dev); 131 if (total_remaining) 132 cvm_oct_kick_tx_poll_watchdog(); 133} 134 135/** 136 * cvm_oct_xmit - transmit a packet 137 * @skb: Packet to send 138 * @dev: Device info structure 139 * 140 * Returns Always returns NETDEV_TX_OK 141 */ 142int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev) 143{ 144 cvmx_pko_command_word0_t pko_command; 145 union cvmx_buf_ptr hw_buffer; 146 u64 old_scratch; 147 u64 old_scratch2; 148 int qos; 149 int i; 150 enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type; 151 struct octeon_ethernet *priv = netdev_priv(dev); 152 struct sk_buff *to_free_list; 153 int32_t skb_to_free; 154 int32_t buffers_to_free; 155 u32 total_to_clean; 156 unsigned long flags; 157#if REUSE_SKBUFFS_WITHOUT_FREE 158 unsigned char *fpa_head; 159#endif 160 161 /* 162 * Prefetch the private data structure. It is larger than the 163 * one cache line. 164 */ 165 prefetch(priv); 166 167 /* 168 * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to 169 * completely remove "qos" in the event neither interface 170 * supports multiple queues per port. 171 */ 172 if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) || 173 (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) { 174 qos = GET_SKBUFF_QOS(skb); 175 if (qos <= 0) 176 qos = 0; 177 else if (qos >= cvmx_pko_get_num_queues(priv->port)) 178 qos = 0; 179 } else 180 qos = 0; 181 182 if (USE_ASYNC_IOBDMA) { 183 /* Save scratch in case userspace is using it */ 184 CVMX_SYNCIOBDMA; 185 old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH); 186 old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8); 187 188 /* 189 * Fetch and increment the number of packets to be 190 * freed. 191 */ 192 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8, 193 FAU_NUM_PACKET_BUFFERS_TO_FREE, 194 0); 195 cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH, 196 priv->fau + qos * 4, 197 MAX_SKB_TO_FREE); 198 } 199 200 /* 201 * We have space for 6 segment pointers, If there will be more 202 * than that, we must linearize. 203 */ 204 if (unlikely(skb_shinfo(skb)->nr_frags > 5)) { 205 if (unlikely(__skb_linearize(skb))) { 206 queue_type = QUEUE_DROP; 207 if (USE_ASYNC_IOBDMA) { 208 /* 209 * Get the number of skbuffs in use 210 * by the hardware 211 */ 212 CVMX_SYNCIOBDMA; 213 skb_to_free = 214 cvmx_scratch_read64(CVMX_SCR_SCRATCH); 215 } else { 216 /* 217 * Get the number of skbuffs in use 218 * by the hardware 219 */ 220 skb_to_free = cvmx_fau_fetch_and_add32( 221 priv->fau + qos * 4, MAX_SKB_TO_FREE); 222 } 223 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, 224 priv->fau + qos * 4); 225 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); 226 goto skip_xmit; 227 } 228 } 229 230 /* 231 * The CN3XXX series of parts has an errata (GMX-401) which 232 * causes the GMX block to hang if a collision occurs towards 233 * the end of a <68 byte packet. As a workaround for this, we 234 * pad packets to be 68 bytes whenever we are in half duplex 235 * mode. We don't handle the case of having a small packet but 236 * no room to add the padding. The kernel should always give 237 * us at least a cache line 238 */ 239 if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) { 240 union cvmx_gmxx_prtx_cfg gmx_prt_cfg; 241 int interface = INTERFACE(priv->port); 242 int index = INDEX(priv->port); 243 244 if (interface < 2) { 245 /* We only need to pad packet in half duplex mode */ 246 gmx_prt_cfg.u64 = 247 cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface)); 248 if (gmx_prt_cfg.s.duplex == 0) { 249 int add_bytes = 64 - skb->len; 250 251 if ((skb_tail_pointer(skb) + add_bytes) <= 252 skb_end_pointer(skb)) 253 memset(__skb_put(skb, add_bytes), 0, 254 add_bytes); 255 } 256 } 257 } 258 259 /* Build the PKO command */ 260 pko_command.u64 = 0; 261#ifdef __LITTLE_ENDIAN 262 pko_command.s.le = 1; 263#endif 264 pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */ 265 pko_command.s.segs = 1; 266 pko_command.s.total_bytes = skb->len; 267 pko_command.s.size0 = CVMX_FAU_OP_SIZE_32; 268 pko_command.s.subone0 = 1; 269 270 pko_command.s.dontfree = 1; 271 272 /* Build the PKO buffer pointer */ 273 hw_buffer.u64 = 0; 274 if (skb_shinfo(skb)->nr_frags == 0) { 275 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data); 276 hw_buffer.s.pool = 0; 277 hw_buffer.s.size = skb->len; 278 } else { 279 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data); 280 hw_buffer.s.pool = 0; 281 hw_buffer.s.size = skb_headlen(skb); 282 CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64; 283 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 284 struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i; 285 286 hw_buffer.s.addr = XKPHYS_TO_PHYS( 287 (u64)(page_address(fs->page.p) + 288 fs->page_offset)); 289 hw_buffer.s.size = fs->size; 290 CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64; 291 } 292 hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb)); 293 hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1; 294 pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1; 295 pko_command.s.gather = 1; 296 goto dont_put_skbuff_in_hw; 297 } 298 299 /* 300 * See if we can put this skb in the FPA pool. Any strange 301 * behavior from the Linux networking stack will most likely 302 * be caused by a bug in the following code. If some field is 303 * in use by the network stack and gets carried over when a 304 * buffer is reused, bad things may happen. If in doubt and 305 * you dont need the absolute best performance, disable the 306 * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has 307 * shown a 25% increase in performance under some loads. 308 */ 309#if REUSE_SKBUFFS_WITHOUT_FREE 310 fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f); 311 if (unlikely(skb->data < fpa_head)) { 312 /* 313 * printk("TX buffer beginning can't meet FPA 314 * alignment constraints\n"); 315 */ 316 goto dont_put_skbuff_in_hw; 317 } 318 if (unlikely 319 ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) { 320 /* 321 printk("TX buffer isn't large enough for the FPA\n"); 322 */ 323 goto dont_put_skbuff_in_hw; 324 } 325 if (unlikely(skb_shared(skb))) { 326 /* 327 printk("TX buffer sharing data with someone else\n"); 328 */ 329 goto dont_put_skbuff_in_hw; 330 } 331 if (unlikely(skb_cloned(skb))) { 332 /* 333 printk("TX buffer has been cloned\n"); 334 */ 335 goto dont_put_skbuff_in_hw; 336 } 337 if (unlikely(skb_header_cloned(skb))) { 338 /* 339 printk("TX buffer header has been cloned\n"); 340 */ 341 goto dont_put_skbuff_in_hw; 342 } 343 if (unlikely(skb->destructor)) { 344 /* 345 printk("TX buffer has a destructor\n"); 346 */ 347 goto dont_put_skbuff_in_hw; 348 } 349 if (unlikely(skb_shinfo(skb)->nr_frags)) { 350 /* 351 printk("TX buffer has fragments\n"); 352 */ 353 goto dont_put_skbuff_in_hw; 354 } 355 if (unlikely 356 (skb->truesize != 357 sizeof(*skb) + skb_end_offset(skb))) { 358 /* 359 printk("TX buffer truesize has been changed\n"); 360 */ 361 goto dont_put_skbuff_in_hw; 362 } 363 364 /* 365 * We can use this buffer in the FPA. We don't need the FAU 366 * update anymore 367 */ 368 pko_command.s.dontfree = 0; 369 370 hw_buffer.s.back = ((unsigned long)skb->data >> 7) - 371 ((unsigned long)fpa_head >> 7); 372 373 *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb; 374 375 /* 376 * The skbuff will be reused without ever being freed. We must 377 * cleanup a bunch of core things. 378 */ 379 dst_release(skb_dst(skb)); 380 skb_dst_set(skb, NULL); 381#ifdef CONFIG_XFRM 382 secpath_put(skb->sp); 383 skb->sp = NULL; 384#endif 385 nf_reset(skb); 386 387#ifdef CONFIG_NET_SCHED 388 skb->tc_index = 0; 389#ifdef CONFIG_NET_CLS_ACT 390 skb->tc_verd = 0; 391#endif /* CONFIG_NET_CLS_ACT */ 392#endif /* CONFIG_NET_SCHED */ 393#endif /* REUSE_SKBUFFS_WITHOUT_FREE */ 394 395dont_put_skbuff_in_hw: 396 397 /* Check if we can use the hardware checksumming */ 398 if ((skb->protocol == htons(ETH_P_IP)) && 399 (ip_hdr(skb)->version == 4) && 400 (ip_hdr(skb)->ihl == 5) && 401 ((ip_hdr(skb)->frag_off == 0) || 402 (ip_hdr(skb)->frag_off == htons(1 << 14))) && 403 ((ip_hdr(skb)->protocol == IPPROTO_TCP) || 404 (ip_hdr(skb)->protocol == IPPROTO_UDP))) { 405 /* Use hardware checksum calc */ 406 pko_command.s.ipoffp1 = sizeof(struct ethhdr) + 1; 407 } 408 409 if (USE_ASYNC_IOBDMA) { 410 /* Get the number of skbuffs in use by the hardware */ 411 CVMX_SYNCIOBDMA; 412 skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH); 413 buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8); 414 } else { 415 /* Get the number of skbuffs in use by the hardware */ 416 skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4, 417 MAX_SKB_TO_FREE); 418 buffers_to_free = 419 cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0); 420 } 421 422 skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4); 423 424 /* 425 * If we're sending faster than the receive can free them then 426 * don't do the HW free. 427 */ 428 if ((buffers_to_free < -100) && !pko_command.s.dontfree) 429 pko_command.s.dontfree = 1; 430 431 if (pko_command.s.dontfree) { 432 queue_type = QUEUE_CORE; 433 pko_command.s.reg0 = priv->fau+qos*4; 434 } else { 435 queue_type = QUEUE_HW; 436 } 437 if (USE_ASYNC_IOBDMA) 438 cvmx_fau_async_fetch_and_add32( 439 CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1); 440 441 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); 442 443 /* Drop this packet if we have too many already queued to the HW */ 444 if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >= 445 MAX_OUT_QUEUE_DEPTH)) { 446 447 if (dev->tx_queue_len != 0) { 448 /* Drop the lock when notifying the core. */ 449 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, 450 flags); 451 netif_stop_queue(dev); 452 spin_lock_irqsave(&priv->tx_free_list[qos].lock, 453 flags); 454 } else { 455 /* If not using normal queueing. */ 456 queue_type = QUEUE_DROP; 457 goto skip_xmit; 458 } 459 } 460 461 cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos, 462 CVMX_PKO_LOCK_NONE); 463 464 /* Send the packet to the output queue */ 465 if (unlikely(cvmx_pko_send_packet_finish(priv->port, 466 priv->queue + qos, 467 pko_command, hw_buffer, 468 CVMX_PKO_LOCK_NONE))) { 469 printk_ratelimited("%s: Failed to send the packet\n", 470 dev->name); 471 queue_type = QUEUE_DROP; 472 } 473skip_xmit: 474 to_free_list = NULL; 475 476 switch (queue_type) { 477 case QUEUE_DROP: 478 skb->next = to_free_list; 479 to_free_list = skb; 480 priv->stats.tx_dropped++; 481 break; 482 case QUEUE_HW: 483 cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1); 484 break; 485 case QUEUE_CORE: 486 __skb_queue_tail(&priv->tx_free_list[qos], skb); 487 break; 488 default: 489 BUG(); 490 } 491 492 while (skb_to_free > 0) { 493 struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]); 494 495 t->next = to_free_list; 496 to_free_list = t; 497 skb_to_free--; 498 } 499 500 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags); 501 502 /* Do the actual freeing outside of the lock. */ 503 while (to_free_list) { 504 struct sk_buff *t = to_free_list; 505 506 to_free_list = to_free_list->next; 507 dev_kfree_skb_any(t); 508 } 509 510 if (USE_ASYNC_IOBDMA) { 511 CVMX_SYNCIOBDMA; 512 total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH); 513 /* Restore the scratch area */ 514 cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch); 515 cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2); 516 } else { 517 total_to_clean = cvmx_fau_fetch_and_add32( 518 FAU_TOTAL_TX_TO_CLEAN, 1); 519 } 520 521 if (total_to_clean & 0x3ff) { 522 /* 523 * Schedule the cleanup tasklet every 1024 packets for 524 * the pathological case of high traffic on one port 525 * delaying clean up of packets on a different port 526 * that is blocked waiting for the cleanup. 527 */ 528 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet); 529 } 530 531 cvm_oct_kick_tx_poll_watchdog(); 532 533 return NETDEV_TX_OK; 534} 535 536/** 537 * cvm_oct_xmit_pow - transmit a packet to the POW 538 * @skb: Packet to send 539 * @dev: Device info structure 540 541 * Returns Always returns zero 542 */ 543int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev) 544{ 545 struct octeon_ethernet *priv = netdev_priv(dev); 546 void *packet_buffer; 547 void *copy_location; 548 549 /* Get a work queue entry */ 550 cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL); 551 552 if (unlikely(!work)) { 553 printk_ratelimited("%s: Failed to allocate a work queue entry\n", 554 dev->name); 555 priv->stats.tx_dropped++; 556 dev_kfree_skb_any(skb); 557 return 0; 558 } 559 560 /* Get a packet buffer */ 561 packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL); 562 if (unlikely(packet_buffer == NULL)) { 563 printk_ratelimited("%s: Failed to allocate a packet buffer\n", 564 dev->name); 565 cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1); 566 priv->stats.tx_dropped++; 567 dev_kfree_skb_any(skb); 568 return 0; 569 } 570 571 /* 572 * Calculate where we need to copy the data to. We need to 573 * leave 8 bytes for a next pointer (unused). We also need to 574 * include any configure skip. Then we need to align the IP 575 * packet src and dest into the same 64bit word. The below 576 * calculation may add a little extra, but that doesn't 577 * hurt. 578 */ 579 copy_location = packet_buffer + sizeof(u64); 580 copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6; 581 582 /* 583 * We have to copy the packet since whoever processes this 584 * packet will free it to a hardware pool. We can't use the 585 * trick of counting outstanding packets like in 586 * cvm_oct_xmit. 587 */ 588 memcpy(copy_location, skb->data, skb->len); 589 590 /* 591 * Fill in some of the work queue fields. We may need to add 592 * more if the software at the other end needs them. 593 */ 594 if (!OCTEON_IS_MODEL(OCTEON_CN68XX)) 595 work->word0.pip.cn38xx.hw_chksum = skb->csum; 596 work->word1.len = skb->len; 597 cvmx_wqe_set_port(work, priv->port); 598 cvmx_wqe_set_qos(work, priv->port & 0x7); 599 cvmx_wqe_set_grp(work, pow_send_group); 600 work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE; 601 work->word1.tag = pow_send_group; /* FIXME */ 602 /* Default to zero. Sets of zero later are commented out */ 603 work->word2.u64 = 0; 604 work->word2.s.bufs = 1; 605 work->packet_ptr.u64 = 0; 606 work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location); 607 work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL; 608 work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE; 609 work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7; 610 611 if (skb->protocol == htons(ETH_P_IP)) { 612 work->word2.s.ip_offset = 14; 613#if 0 614 work->word2.s.vlan_valid = 0; /* FIXME */ 615 work->word2.s.vlan_cfi = 0; /* FIXME */ 616 work->word2.s.vlan_id = 0; /* FIXME */ 617 work->word2.s.dec_ipcomp = 0; /* FIXME */ 618#endif 619 work->word2.s.tcp_or_udp = 620 (ip_hdr(skb)->protocol == IPPROTO_TCP) 621 || (ip_hdr(skb)->protocol == IPPROTO_UDP); 622#if 0 623 /* FIXME */ 624 work->word2.s.dec_ipsec = 0; 625 /* We only support IPv4 right now */ 626 work->word2.s.is_v6 = 0; 627 /* Hardware would set to zero */ 628 work->word2.s.software = 0; 629 /* No error, packet is internal */ 630 work->word2.s.L4_error = 0; 631#endif 632 work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) 633 || (ip_hdr(skb)->frag_off == 634 1 << 14)); 635#if 0 636 /* Assume Linux is sending a good packet */ 637 work->word2.s.IP_exc = 0; 638#endif 639 work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST); 640 work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST); 641#if 0 642 /* This is an IP packet */ 643 work->word2.s.not_IP = 0; 644 /* No error, packet is internal */ 645 work->word2.s.rcv_error = 0; 646 /* No error, packet is internal */ 647 work->word2.s.err_code = 0; 648#endif 649 650 /* 651 * When copying the data, include 4 bytes of the 652 * ethernet header to align the same way hardware 653 * does. 654 */ 655 memcpy(work->packet_data, skb->data + 10, 656 sizeof(work->packet_data)); 657 } else { 658#if 0 659 work->word2.snoip.vlan_valid = 0; /* FIXME */ 660 work->word2.snoip.vlan_cfi = 0; /* FIXME */ 661 work->word2.snoip.vlan_id = 0; /* FIXME */ 662 work->word2.snoip.software = 0; /* Hardware would set to zero */ 663#endif 664 work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP); 665 work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP); 666 work->word2.snoip.is_bcast = 667 (skb->pkt_type == PACKET_BROADCAST); 668 work->word2.snoip.is_mcast = 669 (skb->pkt_type == PACKET_MULTICAST); 670 work->word2.snoip.not_IP = 1; /* IP was done up above */ 671#if 0 672 /* No error, packet is internal */ 673 work->word2.snoip.rcv_error = 0; 674 /* No error, packet is internal */ 675 work->word2.snoip.err_code = 0; 676#endif 677 memcpy(work->packet_data, skb->data, sizeof(work->packet_data)); 678 } 679 680 /* Submit the packet to the POW */ 681 cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type, 682 cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work)); 683 priv->stats.tx_packets++; 684 priv->stats.tx_bytes += skb->len; 685 dev_consume_skb_any(skb); 686 return 0; 687} 688 689/** 690 * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX. 691 * @dev: Device being shutdown 692 * 693 */ 694void cvm_oct_tx_shutdown_dev(struct net_device *dev) 695{ 696 struct octeon_ethernet *priv = netdev_priv(dev); 697 unsigned long flags; 698 int qos; 699 700 for (qos = 0; qos < 16; qos++) { 701 spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); 702 while (skb_queue_len(&priv->tx_free_list[qos])) 703 dev_kfree_skb_any(__skb_dequeue 704 (&priv->tx_free_list[qos])); 705 spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags); 706 } 707} 708 709static void cvm_oct_tx_do_cleanup(unsigned long arg) 710{ 711 int port; 712 713 for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) { 714 if (cvm_oct_device[port]) { 715 struct net_device *dev = cvm_oct_device[port]; 716 717 cvm_oct_free_tx_skbs(dev); 718 } 719 } 720} 721 722static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id) 723{ 724 /* Disable the interrupt. */ 725 cvmx_write_csr(CVMX_CIU_TIMX(1), 0); 726 /* Do the work in the tasklet. */ 727 tasklet_schedule(&cvm_oct_tx_cleanup_tasklet); 728 return IRQ_HANDLED; 729} 730 731void cvm_oct_tx_initialize(void) 732{ 733 int i; 734 735 /* Disable the interrupt. */ 736 cvmx_write_csr(CVMX_CIU_TIMX(1), 0); 737 /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */ 738 i = request_irq(OCTEON_IRQ_TIMER1, 739 cvm_oct_tx_cleanup_watchdog, 0, 740 "Ethernet", cvm_oct_device); 741 742 if (i) 743 panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1); 744} 745 746void cvm_oct_tx_shutdown(void) 747{ 748 /* Free the interrupt handler */ 749 free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device); 750} 751