sfxge_tx.c revision 311029
1/*- 2 * Copyright (c) 2010-2016 Solarflare Communications Inc. 3 * All rights reserved. 4 * 5 * This software was developed in part by Philip Paeps under contract for 6 * Solarflare Communications, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright notice, 14 * this list of conditions and the following disclaimer in the documentation 15 * and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 19 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 21 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 27 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * The views and conclusions contained in the software and documentation are 30 * those of the authors and should not be interpreted as representing official 31 * policies, either expressed or implied, of the FreeBSD Project. 32 */ 33 34/* Theory of operation: 35 * 36 * Tx queues allocation and mapping 37 * 38 * One Tx queue with enabled checksum offload is allocated per Rx channel 39 * (event queue). Also 2 Tx queues (one without checksum offload and one 40 * with IP checksum offload only) are allocated and bound to event queue 0. 41 * sfxge_txq_type is used as Tx queue label. 42 * 43 * So, event queue plus label mapping to Tx queue index is: 44 * if event queue index is 0, TxQ-index = TxQ-label * [0..SFXGE_TXQ_NTYPES) 45 * else TxQ-index = SFXGE_TXQ_NTYPES + EvQ-index - 1 46 * See sfxge_get_txq_by_label() sfxge_ev.c 47 */ 48 49#include <sys/cdefs.h> 50__FBSDID("$FreeBSD: stable/11/sys/dev/sfxge/sfxge_tx.c 311029 2017-01-01 19:35:29Z arybchik $"); 51 52#include "opt_rss.h" 53 54#include <sys/param.h> 55#include <sys/malloc.h> 56#include <sys/mbuf.h> 57#include <sys/smp.h> 58#include <sys/socket.h> 59#include <sys/sysctl.h> 60#include <sys/syslog.h> 61#include <sys/limits.h> 62 63#include <net/bpf.h> 64#include <net/ethernet.h> 65#include <net/if.h> 66#include <net/if_vlan_var.h> 67 68#include <netinet/in.h> 69#include <netinet/ip.h> 70#include <netinet/ip6.h> 71#include <netinet/tcp.h> 72 73#ifdef RSS 74#include <net/rss_config.h> 75#endif 76 77#include "common/efx.h" 78 79#include "sfxge.h" 80#include "sfxge_tx.h" 81 82 83#define SFXGE_PARAM_TX_DPL_GET_MAX SFXGE_PARAM(tx_dpl_get_max) 84static int sfxge_tx_dpl_get_max = SFXGE_TX_DPL_GET_PKT_LIMIT_DEFAULT; 85TUNABLE_INT(SFXGE_PARAM_TX_DPL_GET_MAX, &sfxge_tx_dpl_get_max); 86SYSCTL_INT(_hw_sfxge, OID_AUTO, tx_dpl_get_max, CTLFLAG_RDTUN, 87 &sfxge_tx_dpl_get_max, 0, 88 "Maximum number of any packets in deferred packet get-list"); 89 90#define SFXGE_PARAM_TX_DPL_GET_NON_TCP_MAX \ 91 SFXGE_PARAM(tx_dpl_get_non_tcp_max) 92static int sfxge_tx_dpl_get_non_tcp_max = 93 SFXGE_TX_DPL_GET_NON_TCP_PKT_LIMIT_DEFAULT; 94TUNABLE_INT(SFXGE_PARAM_TX_DPL_GET_NON_TCP_MAX, &sfxge_tx_dpl_get_non_tcp_max); 95SYSCTL_INT(_hw_sfxge, OID_AUTO, tx_dpl_get_non_tcp_max, CTLFLAG_RDTUN, 96 &sfxge_tx_dpl_get_non_tcp_max, 0, 97 "Maximum number of non-TCP packets in deferred packet get-list"); 98 99#define SFXGE_PARAM_TX_DPL_PUT_MAX SFXGE_PARAM(tx_dpl_put_max) 100static int sfxge_tx_dpl_put_max = SFXGE_TX_DPL_PUT_PKT_LIMIT_DEFAULT; 101TUNABLE_INT(SFXGE_PARAM_TX_DPL_PUT_MAX, &sfxge_tx_dpl_put_max); 102SYSCTL_INT(_hw_sfxge, OID_AUTO, tx_dpl_put_max, CTLFLAG_RDTUN, 103 &sfxge_tx_dpl_put_max, 0, 104 "Maximum number of any packets in deferred packet put-list"); 105 106#define SFXGE_PARAM_TSO_FW_ASSISTED SFXGE_PARAM(tso_fw_assisted) 107static int sfxge_tso_fw_assisted = (SFXGE_FATSOV1 | SFXGE_FATSOV2); 108TUNABLE_INT(SFXGE_PARAM_TSO_FW_ASSISTED, &sfxge_tso_fw_assisted); 109SYSCTL_INT(_hw_sfxge, OID_AUTO, tso_fw_assisted, CTLFLAG_RDTUN, 110 &sfxge_tso_fw_assisted, 0, 111 "Bitmask of FW-assisted TSO allowed to use if supported by NIC firmware"); 112 113 114static const struct { 115 const char *name; 116 size_t offset; 117} sfxge_tx_stats[] = { 118#define SFXGE_TX_STAT(name, member) \ 119 { #name, offsetof(struct sfxge_txq, member) } 120 SFXGE_TX_STAT(tso_bursts, tso_bursts), 121 SFXGE_TX_STAT(tso_packets, tso_packets), 122 SFXGE_TX_STAT(tso_long_headers, tso_long_headers), 123 SFXGE_TX_STAT(tso_pdrop_too_many, tso_pdrop_too_many), 124 SFXGE_TX_STAT(tso_pdrop_no_rsrc, tso_pdrop_no_rsrc), 125 SFXGE_TX_STAT(tx_collapses, collapses), 126 SFXGE_TX_STAT(tx_drops, drops), 127 SFXGE_TX_STAT(tx_get_overflow, get_overflow), 128 SFXGE_TX_STAT(tx_get_non_tcp_overflow, get_non_tcp_overflow), 129 SFXGE_TX_STAT(tx_put_overflow, put_overflow), 130 SFXGE_TX_STAT(tx_netdown_drops, netdown_drops), 131}; 132 133 134/* Forward declarations. */ 135static void sfxge_tx_qdpl_service(struct sfxge_txq *txq); 136static void sfxge_tx_qlist_post(struct sfxge_txq *txq); 137static void sfxge_tx_qunblock(struct sfxge_txq *txq); 138static int sfxge_tx_queue_tso(struct sfxge_txq *txq, struct mbuf *mbuf, 139 const bus_dma_segment_t *dma_seg, int n_dma_seg, 140 int vlan_tagged); 141 142static int 143sfxge_tx_maybe_insert_tag(struct sfxge_txq *txq, struct mbuf *mbuf) 144{ 145 uint16_t this_tag = ((mbuf->m_flags & M_VLANTAG) ? 146 mbuf->m_pkthdr.ether_vtag : 147 0); 148 149 if (this_tag == txq->hw_vlan_tci) 150 return (0); 151 152 efx_tx_qdesc_vlantci_create(txq->common, 153 bswap16(this_tag), 154 &txq->pend_desc[0]); 155 txq->n_pend_desc = 1; 156 txq->hw_vlan_tci = this_tag; 157 return (1); 158} 159 160static inline void 161sfxge_next_stmp(struct sfxge_txq *txq, struct sfxge_tx_mapping **pstmp) 162{ 163 KASSERT((*pstmp)->flags == 0, ("stmp flags are not 0")); 164 if (__predict_false(*pstmp == 165 &txq->stmp[txq->ptr_mask])) 166 *pstmp = &txq->stmp[0]; 167 else 168 (*pstmp)++; 169} 170 171 172void 173sfxge_tx_qcomplete(struct sfxge_txq *txq, struct sfxge_evq *evq) 174{ 175 unsigned int completed; 176 177 SFXGE_EVQ_LOCK_ASSERT_OWNED(evq); 178 179 completed = txq->completed; 180 while (completed != txq->pending) { 181 struct sfxge_tx_mapping *stmp; 182 unsigned int id; 183 184 id = completed++ & txq->ptr_mask; 185 186 stmp = &txq->stmp[id]; 187 if (stmp->flags & TX_BUF_UNMAP) { 188 bus_dmamap_unload(txq->packet_dma_tag, stmp->map); 189 if (stmp->flags & TX_BUF_MBUF) { 190 struct mbuf *m = stmp->u.mbuf; 191 do 192 m = m_free(m); 193 while (m != NULL); 194 } else { 195 free(stmp->u.heap_buf, M_SFXGE); 196 } 197 stmp->flags = 0; 198 } 199 } 200 txq->completed = completed; 201 202 /* Check whether we need to unblock the queue. */ 203 mb(); 204 if (txq->blocked) { 205 unsigned int level; 206 207 level = txq->added - txq->completed; 208 if (level <= SFXGE_TXQ_UNBLOCK_LEVEL(txq->entries)) 209 sfxge_tx_qunblock(txq); 210 } 211} 212 213static unsigned int 214sfxge_is_mbuf_non_tcp(struct mbuf *mbuf) 215{ 216 /* Absence of TCP checksum flags does not mean that it is non-TCP 217 * but it should be true if user wants to achieve high throughput. 218 */ 219 return (!(mbuf->m_pkthdr.csum_flags & (CSUM_IP_TCP | CSUM_IP6_TCP))); 220} 221 222/* 223 * Reorder the put list and append it to the get list. 224 */ 225static void 226sfxge_tx_qdpl_swizzle(struct sfxge_txq *txq) 227{ 228 struct sfxge_tx_dpl *stdp; 229 struct mbuf *mbuf, *get_next, **get_tailp; 230 volatile uintptr_t *putp; 231 uintptr_t put; 232 unsigned int count; 233 unsigned int non_tcp_count; 234 235 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq); 236 237 stdp = &txq->dpl; 238 239 /* Acquire the put list. */ 240 putp = &stdp->std_put; 241 put = atomic_readandclear_ptr(putp); 242 mbuf = (void *)put; 243 244 if (mbuf == NULL) 245 return; 246 247 /* Reverse the put list. */ 248 get_tailp = &mbuf->m_nextpkt; 249 get_next = NULL; 250 251 count = 0; 252 non_tcp_count = 0; 253 do { 254 struct mbuf *put_next; 255 256 non_tcp_count += sfxge_is_mbuf_non_tcp(mbuf); 257 put_next = mbuf->m_nextpkt; 258 mbuf->m_nextpkt = get_next; 259 get_next = mbuf; 260 mbuf = put_next; 261 262 count++; 263 } while (mbuf != NULL); 264 265 if (count > stdp->std_put_hiwat) 266 stdp->std_put_hiwat = count; 267 268 /* Append the reversed put list to the get list. */ 269 KASSERT(*get_tailp == NULL, ("*get_tailp != NULL")); 270 *stdp->std_getp = get_next; 271 stdp->std_getp = get_tailp; 272 stdp->std_get_count += count; 273 stdp->std_get_non_tcp_count += non_tcp_count; 274} 275 276static void 277sfxge_tx_qreap(struct sfxge_txq *txq) 278{ 279 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq); 280 281 txq->reaped = txq->completed; 282} 283 284static void 285sfxge_tx_qlist_post(struct sfxge_txq *txq) 286{ 287 unsigned int old_added; 288 unsigned int block_level; 289 unsigned int level; 290 int rc; 291 292 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq); 293 294 KASSERT(txq->n_pend_desc != 0, ("txq->n_pend_desc == 0")); 295 KASSERT(txq->n_pend_desc <= txq->max_pkt_desc, 296 ("txq->n_pend_desc too large")); 297 KASSERT(!txq->blocked, ("txq->blocked")); 298 299 old_added = txq->added; 300 301 /* Post the fragment list. */ 302 rc = efx_tx_qdesc_post(txq->common, txq->pend_desc, txq->n_pend_desc, 303 txq->reaped, &txq->added); 304 KASSERT(rc == 0, ("efx_tx_qdesc_post() failed")); 305 306 /* If efx_tx_qdesc_post() had to refragment, our information about 307 * buffers to free may be associated with the wrong 308 * descriptors. 309 */ 310 KASSERT(txq->added - old_added == txq->n_pend_desc, 311 ("efx_tx_qdesc_post() refragmented descriptors")); 312 313 level = txq->added - txq->reaped; 314 KASSERT(level <= txq->entries, ("overfilled TX queue")); 315 316 /* Clear the fragment list. */ 317 txq->n_pend_desc = 0; 318 319 /* 320 * Set the block level to ensure there is space to generate a 321 * large number of descriptors for TSO. 322 */ 323 block_level = EFX_TXQ_LIMIT(txq->entries) - txq->max_pkt_desc; 324 325 /* Have we reached the block level? */ 326 if (level < block_level) 327 return; 328 329 /* Reap, and check again */ 330 sfxge_tx_qreap(txq); 331 level = txq->added - txq->reaped; 332 if (level < block_level) 333 return; 334 335 txq->blocked = 1; 336 337 /* 338 * Avoid a race with completion interrupt handling that could leave 339 * the queue blocked. 340 */ 341 mb(); 342 sfxge_tx_qreap(txq); 343 level = txq->added - txq->reaped; 344 if (level < block_level) { 345 mb(); 346 txq->blocked = 0; 347 } 348} 349 350static int sfxge_tx_queue_mbuf(struct sfxge_txq *txq, struct mbuf *mbuf) 351{ 352 bus_dmamap_t *used_map; 353 bus_dmamap_t map; 354 bus_dma_segment_t dma_seg[SFXGE_TX_MAPPING_MAX_SEG]; 355 unsigned int id; 356 struct sfxge_tx_mapping *stmp; 357 efx_desc_t *desc; 358 int n_dma_seg; 359 int rc; 360 int i; 361 int eop; 362 int vlan_tagged; 363 364 KASSERT(!txq->blocked, ("txq->blocked")); 365 366 if (mbuf->m_pkthdr.csum_flags & CSUM_TSO) 367 prefetch_read_many(mbuf->m_data); 368 369 if (__predict_false(txq->init_state != SFXGE_TXQ_STARTED)) { 370 rc = EINTR; 371 goto reject; 372 } 373 374 /* Load the packet for DMA. */ 375 id = txq->added & txq->ptr_mask; 376 stmp = &txq->stmp[id]; 377 rc = bus_dmamap_load_mbuf_sg(txq->packet_dma_tag, stmp->map, 378 mbuf, dma_seg, &n_dma_seg, 0); 379 if (rc == EFBIG) { 380 /* Try again. */ 381 struct mbuf *new_mbuf = m_collapse(mbuf, M_NOWAIT, 382 SFXGE_TX_MAPPING_MAX_SEG); 383 if (new_mbuf == NULL) 384 goto reject; 385 ++txq->collapses; 386 mbuf = new_mbuf; 387 rc = bus_dmamap_load_mbuf_sg(txq->packet_dma_tag, 388 stmp->map, mbuf, 389 dma_seg, &n_dma_seg, 0); 390 } 391 if (rc != 0) 392 goto reject; 393 394 /* Make the packet visible to the hardware. */ 395 bus_dmamap_sync(txq->packet_dma_tag, stmp->map, BUS_DMASYNC_PREWRITE); 396 397 used_map = &stmp->map; 398 399 vlan_tagged = sfxge_tx_maybe_insert_tag(txq, mbuf); 400 if (vlan_tagged) { 401 sfxge_next_stmp(txq, &stmp); 402 } 403 if (mbuf->m_pkthdr.csum_flags & CSUM_TSO) { 404 rc = sfxge_tx_queue_tso(txq, mbuf, dma_seg, n_dma_seg, vlan_tagged); 405 if (rc < 0) 406 goto reject_mapped; 407 stmp = &txq->stmp[(rc - 1) & txq->ptr_mask]; 408 } else { 409 /* Add the mapping to the fragment list, and set flags 410 * for the buffer. 411 */ 412 413 i = 0; 414 for (;;) { 415 desc = &txq->pend_desc[i + vlan_tagged]; 416 eop = (i == n_dma_seg - 1); 417 efx_tx_qdesc_dma_create(txq->common, 418 dma_seg[i].ds_addr, 419 dma_seg[i].ds_len, 420 eop, 421 desc); 422 if (eop) 423 break; 424 i++; 425 sfxge_next_stmp(txq, &stmp); 426 } 427 txq->n_pend_desc = n_dma_seg + vlan_tagged; 428 } 429 430 /* 431 * If the mapping required more than one descriptor 432 * then we need to associate the DMA map with the last 433 * descriptor, not the first. 434 */ 435 if (used_map != &stmp->map) { 436 map = stmp->map; 437 stmp->map = *used_map; 438 *used_map = map; 439 } 440 441 stmp->u.mbuf = mbuf; 442 stmp->flags = TX_BUF_UNMAP | TX_BUF_MBUF; 443 444 /* Post the fragment list. */ 445 sfxge_tx_qlist_post(txq); 446 447 return (0); 448 449reject_mapped: 450 bus_dmamap_unload(txq->packet_dma_tag, *used_map); 451reject: 452 /* Drop the packet on the floor. */ 453 m_freem(mbuf); 454 ++txq->drops; 455 456 return (rc); 457} 458 459/* 460 * Drain the deferred packet list into the transmit queue. 461 */ 462static void 463sfxge_tx_qdpl_drain(struct sfxge_txq *txq) 464{ 465 struct sfxge_softc *sc; 466 struct sfxge_tx_dpl *stdp; 467 struct mbuf *mbuf, *next; 468 unsigned int count; 469 unsigned int non_tcp_count; 470 unsigned int pushed; 471 int rc; 472 473 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq); 474 475 sc = txq->sc; 476 stdp = &txq->dpl; 477 pushed = txq->added; 478 479 if (__predict_true(txq->init_state == SFXGE_TXQ_STARTED)) { 480 prefetch_read_many(sc->enp); 481 prefetch_read_many(txq->common); 482 } 483 484 mbuf = stdp->std_get; 485 count = stdp->std_get_count; 486 non_tcp_count = stdp->std_get_non_tcp_count; 487 488 if (count > stdp->std_get_hiwat) 489 stdp->std_get_hiwat = count; 490 491 while (count != 0) { 492 KASSERT(mbuf != NULL, ("mbuf == NULL")); 493 494 next = mbuf->m_nextpkt; 495 mbuf->m_nextpkt = NULL; 496 497 ETHER_BPF_MTAP(sc->ifnet, mbuf); /* packet capture */ 498 499 if (next != NULL) 500 prefetch_read_many(next); 501 502 rc = sfxge_tx_queue_mbuf(txq, mbuf); 503 --count; 504 non_tcp_count -= sfxge_is_mbuf_non_tcp(mbuf); 505 mbuf = next; 506 if (rc != 0) 507 continue; 508 509 if (txq->blocked) 510 break; 511 512 /* Push the fragments to the hardware in batches. */ 513 if (txq->added - pushed >= SFXGE_TX_BATCH) { 514 efx_tx_qpush(txq->common, txq->added, pushed); 515 pushed = txq->added; 516 } 517 } 518 519 if (count == 0) { 520 KASSERT(mbuf == NULL, ("mbuf != NULL")); 521 KASSERT(non_tcp_count == 0, 522 ("inconsistent TCP/non-TCP detection")); 523 stdp->std_get = NULL; 524 stdp->std_get_count = 0; 525 stdp->std_get_non_tcp_count = 0; 526 stdp->std_getp = &stdp->std_get; 527 } else { 528 stdp->std_get = mbuf; 529 stdp->std_get_count = count; 530 stdp->std_get_non_tcp_count = non_tcp_count; 531 } 532 533 if (txq->added != pushed) 534 efx_tx_qpush(txq->common, txq->added, pushed); 535 536 KASSERT(txq->blocked || stdp->std_get_count == 0, 537 ("queue unblocked but count is non-zero")); 538} 539 540#define SFXGE_TX_QDPL_PENDING(_txq) ((_txq)->dpl.std_put != 0) 541 542/* 543 * Service the deferred packet list. 544 * 545 * NOTE: drops the txq mutex! 546 */ 547static void 548sfxge_tx_qdpl_service(struct sfxge_txq *txq) 549{ 550 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq); 551 552 do { 553 if (SFXGE_TX_QDPL_PENDING(txq)) 554 sfxge_tx_qdpl_swizzle(txq); 555 556 if (!txq->blocked) 557 sfxge_tx_qdpl_drain(txq); 558 559 SFXGE_TXQ_UNLOCK(txq); 560 } while (SFXGE_TX_QDPL_PENDING(txq) && 561 SFXGE_TXQ_TRYLOCK(txq)); 562} 563 564/* 565 * Put a packet on the deferred packet get-list. 566 */ 567static int 568sfxge_tx_qdpl_put_locked(struct sfxge_txq *txq, struct mbuf *mbuf) 569{ 570 struct sfxge_tx_dpl *stdp; 571 572 stdp = &txq->dpl; 573 574 KASSERT(mbuf->m_nextpkt == NULL, ("mbuf->m_nextpkt != NULL")); 575 576 SFXGE_TXQ_LOCK_ASSERT_OWNED(txq); 577 578 if (stdp->std_get_count >= stdp->std_get_max) { 579 txq->get_overflow++; 580 return (ENOBUFS); 581 } 582 if (sfxge_is_mbuf_non_tcp(mbuf)) { 583 if (stdp->std_get_non_tcp_count >= 584 stdp->std_get_non_tcp_max) { 585 txq->get_non_tcp_overflow++; 586 return (ENOBUFS); 587 } 588 stdp->std_get_non_tcp_count++; 589 } 590 591 *(stdp->std_getp) = mbuf; 592 stdp->std_getp = &mbuf->m_nextpkt; 593 stdp->std_get_count++; 594 595 return (0); 596} 597 598/* 599 * Put a packet on the deferred packet put-list. 600 * 601 * We overload the csum_data field in the mbuf to keep track of this length 602 * because there is no cheap alternative to avoid races. 603 */ 604static int 605sfxge_tx_qdpl_put_unlocked(struct sfxge_txq *txq, struct mbuf *mbuf) 606{ 607 struct sfxge_tx_dpl *stdp; 608 volatile uintptr_t *putp; 609 uintptr_t old; 610 uintptr_t new; 611 unsigned int put_count; 612 613 KASSERT(mbuf->m_nextpkt == NULL, ("mbuf->m_nextpkt != NULL")); 614 615 SFXGE_TXQ_LOCK_ASSERT_NOTOWNED(txq); 616 617 stdp = &txq->dpl; 618 putp = &stdp->std_put; 619 new = (uintptr_t)mbuf; 620 621 do { 622 old = *putp; 623 if (old != 0) { 624 struct mbuf *mp = (struct mbuf *)old; 625 put_count = mp->m_pkthdr.csum_data; 626 } else 627 put_count = 0; 628 if (put_count >= stdp->std_put_max) { 629 atomic_add_long(&txq->put_overflow, 1); 630 return (ENOBUFS); 631 } 632 mbuf->m_pkthdr.csum_data = put_count + 1; 633 mbuf->m_nextpkt = (void *)old; 634 } while (atomic_cmpset_ptr(putp, old, new) == 0); 635 636 return (0); 637} 638 639/* 640 * Called from if_transmit - will try to grab the txq lock and enqueue to the 641 * put list if it succeeds, otherwise try to push onto the defer list if space. 642 */ 643static int 644sfxge_tx_packet_add(struct sfxge_txq *txq, struct mbuf *m) 645{ 646 int rc; 647 648 if (!SFXGE_LINK_UP(txq->sc)) { 649 atomic_add_long(&txq->netdown_drops, 1); 650 return (ENETDOWN); 651 } 652 653 /* 654 * Try to grab the txq lock. If we are able to get the lock, 655 * the packet will be appended to the "get list" of the deferred 656 * packet list. Otherwise, it will be pushed on the "put list". 657 */ 658 if (SFXGE_TXQ_TRYLOCK(txq)) { 659 /* First swizzle put-list to get-list to keep order */ 660 sfxge_tx_qdpl_swizzle(txq); 661 662 rc = sfxge_tx_qdpl_put_locked(txq, m); 663 664 /* Try to service the list. */ 665 sfxge_tx_qdpl_service(txq); 666 /* Lock has been dropped. */ 667 } else { 668 rc = sfxge_tx_qdpl_put_unlocked(txq, m); 669 670 /* 671 * Try to grab the lock again. 672 * 673 * If we are able to get the lock, we need to process 674 * the deferred packet list. If we are not able to get 675 * the lock, another thread is processing the list. 676 */ 677 if ((rc == 0) && SFXGE_TXQ_TRYLOCK(txq)) { 678 sfxge_tx_qdpl_service(txq); 679 /* Lock has been dropped. */ 680 } 681 } 682 683 SFXGE_TXQ_LOCK_ASSERT_NOTOWNED(txq); 684 685 return (rc); 686} 687 688static void 689sfxge_tx_qdpl_flush(struct sfxge_txq *txq) 690{ 691 struct sfxge_tx_dpl *stdp = &txq->dpl; 692 struct mbuf *mbuf, *next; 693 694 SFXGE_TXQ_LOCK(txq); 695 696 sfxge_tx_qdpl_swizzle(txq); 697 for (mbuf = stdp->std_get; mbuf != NULL; mbuf = next) { 698 next = mbuf->m_nextpkt; 699 m_freem(mbuf); 700 } 701 stdp->std_get = NULL; 702 stdp->std_get_count = 0; 703 stdp->std_get_non_tcp_count = 0; 704 stdp->std_getp = &stdp->std_get; 705 706 SFXGE_TXQ_UNLOCK(txq); 707} 708 709void 710sfxge_if_qflush(struct ifnet *ifp) 711{ 712 struct sfxge_softc *sc; 713 unsigned int i; 714 715 sc = ifp->if_softc; 716 717 for (i = 0; i < sc->txq_count; i++) 718 sfxge_tx_qdpl_flush(sc->txq[i]); 719} 720 721#if SFXGE_TX_PARSE_EARLY 722 723/* There is little space for user data in mbuf pkthdr, so we 724 * use l*hlen fields which are not used by the driver otherwise 725 * to store header offsets. 726 * The fields are 8-bit, but it's ok, no header may be longer than 255 bytes. 727 */ 728 729 730#define TSO_MBUF_PROTO(_mbuf) ((_mbuf)->m_pkthdr.PH_loc.sixteen[0]) 731/* We abuse l5hlen here because PH_loc can hold only 64 bits of data */ 732#define TSO_MBUF_FLAGS(_mbuf) ((_mbuf)->m_pkthdr.l5hlen) 733#define TSO_MBUF_PACKETID(_mbuf) ((_mbuf)->m_pkthdr.PH_loc.sixteen[1]) 734#define TSO_MBUF_SEQNUM(_mbuf) ((_mbuf)->m_pkthdr.PH_loc.thirtytwo[1]) 735 736static void sfxge_parse_tx_packet(struct mbuf *mbuf) 737{ 738 struct ether_header *eh = mtod(mbuf, struct ether_header *); 739 const struct tcphdr *th; 740 struct tcphdr th_copy; 741 742 /* Find network protocol and header */ 743 TSO_MBUF_PROTO(mbuf) = eh->ether_type; 744 if (TSO_MBUF_PROTO(mbuf) == htons(ETHERTYPE_VLAN)) { 745 struct ether_vlan_header *veh = 746 mtod(mbuf, struct ether_vlan_header *); 747 TSO_MBUF_PROTO(mbuf) = veh->evl_proto; 748 mbuf->m_pkthdr.l2hlen = sizeof(*veh); 749 } else { 750 mbuf->m_pkthdr.l2hlen = sizeof(*eh); 751 } 752 753 /* Find TCP header */ 754 if (TSO_MBUF_PROTO(mbuf) == htons(ETHERTYPE_IP)) { 755 const struct ip *iph = (const struct ip *)mtodo(mbuf, mbuf->m_pkthdr.l2hlen); 756 757 KASSERT(iph->ip_p == IPPROTO_TCP, 758 ("TSO required on non-TCP packet")); 759 mbuf->m_pkthdr.l3hlen = mbuf->m_pkthdr.l2hlen + 4 * iph->ip_hl; 760 TSO_MBUF_PACKETID(mbuf) = iph->ip_id; 761 } else { 762 KASSERT(TSO_MBUF_PROTO(mbuf) == htons(ETHERTYPE_IPV6), 763 ("TSO required on non-IP packet")); 764 KASSERT(((const struct ip6_hdr *)mtodo(mbuf, mbuf->m_pkthdr.l2hlen))->ip6_nxt == 765 IPPROTO_TCP, 766 ("TSO required on non-TCP packet")); 767 mbuf->m_pkthdr.l3hlen = mbuf->m_pkthdr.l2hlen + sizeof(struct ip6_hdr); 768 TSO_MBUF_PACKETID(mbuf) = 0; 769 } 770 771 KASSERT(mbuf->m_len >= mbuf->m_pkthdr.l3hlen, 772 ("network header is fragmented in mbuf")); 773 774 /* We need TCP header including flags (window is the next) */ 775 if (mbuf->m_len < mbuf->m_pkthdr.l3hlen + offsetof(struct tcphdr, th_win)) { 776 m_copydata(mbuf, mbuf->m_pkthdr.l3hlen, sizeof(th_copy), 777 (caddr_t)&th_copy); 778 th = &th_copy; 779 } else { 780 th = (const struct tcphdr *)mtodo(mbuf, mbuf->m_pkthdr.l3hlen); 781 } 782 783 mbuf->m_pkthdr.l4hlen = mbuf->m_pkthdr.l3hlen + 4 * th->th_off; 784 TSO_MBUF_SEQNUM(mbuf) = ntohl(th->th_seq); 785 786 /* These flags must not be duplicated */ 787 /* 788 * RST should not be duplicated as well, but FreeBSD kernel 789 * generates TSO packets with RST flag. So, do not assert 790 * its absence. 791 */ 792 KASSERT(!(th->th_flags & (TH_URG | TH_SYN)), 793 ("incompatible TCP flag 0x%x on TSO packet", 794 th->th_flags & (TH_URG | TH_SYN))); 795 TSO_MBUF_FLAGS(mbuf) = th->th_flags; 796} 797#endif 798 799/* 800 * TX start -- called by the stack. 801 */ 802int 803sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m) 804{ 805 struct sfxge_softc *sc; 806 struct sfxge_txq *txq; 807 int rc; 808 809 sc = (struct sfxge_softc *)ifp->if_softc; 810 811 /* 812 * Transmit may be called when interface is up from the kernel 813 * point of view, but not yet up (in progress) from the driver 814 * point of view. I.e. link aggregation bring up. 815 * Transmit may be called when interface is up from the driver 816 * point of view, but already down from the kernel point of 817 * view. I.e. Rx when interface shutdown is in progress. 818 */ 819 KASSERT((ifp->if_flags & IFF_UP) || (sc->if_flags & IFF_UP), 820 ("interface not up")); 821 822 /* Pick the desired transmit queue. */ 823 if (m->m_pkthdr.csum_flags & 824 (CSUM_DELAY_DATA | CSUM_TCP_IPV6 | CSUM_UDP_IPV6 | CSUM_TSO)) { 825 int index = 0; 826 827#ifdef RSS 828 uint32_t bucket_id; 829 830 /* 831 * Select a TX queue which matches the corresponding 832 * RX queue for the hash in order to assign both 833 * TX and RX parts of the flow to the same CPU 834 */ 835 if (rss_m2bucket(m, &bucket_id) == 0) 836 index = bucket_id % (sc->txq_count - (SFXGE_TXQ_NTYPES - 1)); 837#else 838 /* check if flowid is set */ 839 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 840 uint32_t hash = m->m_pkthdr.flowid; 841 uint32_t idx = hash % nitems(sc->rx_indir_table); 842 843 index = sc->rx_indir_table[idx]; 844 } 845#endif 846#if SFXGE_TX_PARSE_EARLY 847 if (m->m_pkthdr.csum_flags & CSUM_TSO) 848 sfxge_parse_tx_packet(m); 849#endif 850 txq = sc->txq[SFXGE_TXQ_IP_TCP_UDP_CKSUM + index]; 851 } else if (m->m_pkthdr.csum_flags & CSUM_DELAY_IP) { 852 txq = sc->txq[SFXGE_TXQ_IP_CKSUM]; 853 } else { 854 txq = sc->txq[SFXGE_TXQ_NON_CKSUM]; 855 } 856 857 rc = sfxge_tx_packet_add(txq, m); 858 if (rc != 0) 859 m_freem(m); 860 861 return (rc); 862} 863 864/* 865 * Software "TSO". Not quite as good as doing it in hardware, but 866 * still faster than segmenting in the stack. 867 */ 868 869struct sfxge_tso_state { 870 /* Output position */ 871 unsigned out_len; /* Remaining length in current segment */ 872 unsigned seqnum; /* Current sequence number */ 873 unsigned packet_space; /* Remaining space in current packet */ 874 unsigned segs_space; /* Remaining number of DMA segments 875 for the packet (FATSOv2 only) */ 876 877 /* Input position */ 878 uint64_t dma_addr; /* DMA address of current position */ 879 unsigned in_len; /* Remaining length in current mbuf */ 880 881 const struct mbuf *mbuf; /* Input mbuf (head of chain) */ 882 u_short protocol; /* Network protocol (after VLAN decap) */ 883 ssize_t nh_off; /* Offset of network header */ 884 ssize_t tcph_off; /* Offset of TCP header */ 885 unsigned header_len; /* Number of bytes of header */ 886 unsigned seg_size; /* TCP segment size */ 887 int fw_assisted; /* Use FW-assisted TSO */ 888 u_short packet_id; /* IPv4 packet ID from the original packet */ 889 uint8_t tcp_flags; /* TCP flags */ 890 efx_desc_t header_desc; /* Precomputed header descriptor for 891 * FW-assisted TSO */ 892}; 893 894#if !SFXGE_TX_PARSE_EARLY 895static const struct ip *tso_iph(const struct sfxge_tso_state *tso) 896{ 897 KASSERT(tso->protocol == htons(ETHERTYPE_IP), 898 ("tso_iph() in non-IPv4 state")); 899 return (const struct ip *)(tso->mbuf->m_data + tso->nh_off); 900} 901 902static __unused const struct ip6_hdr *tso_ip6h(const struct sfxge_tso_state *tso) 903{ 904 KASSERT(tso->protocol == htons(ETHERTYPE_IPV6), 905 ("tso_ip6h() in non-IPv6 state")); 906 return (const struct ip6_hdr *)(tso->mbuf->m_data + tso->nh_off); 907} 908 909static const struct tcphdr *tso_tcph(const struct sfxge_tso_state *tso) 910{ 911 return (const struct tcphdr *)(tso->mbuf->m_data + tso->tcph_off); 912} 913#endif 914 915 916/* Size of preallocated TSO header buffers. Larger blocks must be 917 * allocated from the heap. 918 */ 919#define TSOH_STD_SIZE 128 920 921/* At most half the descriptors in the queue at any time will refer to 922 * a TSO header buffer, since they must always be followed by a 923 * payload descriptor referring to an mbuf. 924 */ 925#define TSOH_COUNT(_txq_entries) ((_txq_entries) / 2u) 926#define TSOH_PER_PAGE (PAGE_SIZE / TSOH_STD_SIZE) 927#define TSOH_PAGE_COUNT(_txq_entries) \ 928 howmany(TSOH_COUNT(_txq_entries), TSOH_PER_PAGE) 929 930static int tso_init(struct sfxge_txq *txq) 931{ 932 struct sfxge_softc *sc = txq->sc; 933 unsigned int tsoh_page_count = TSOH_PAGE_COUNT(sc->txq_entries); 934 int i, rc; 935 936 /* Allocate TSO header buffers */ 937 txq->tsoh_buffer = malloc(tsoh_page_count * sizeof(txq->tsoh_buffer[0]), 938 M_SFXGE, M_WAITOK); 939 940 for (i = 0; i < tsoh_page_count; i++) { 941 rc = sfxge_dma_alloc(sc, PAGE_SIZE, &txq->tsoh_buffer[i]); 942 if (rc != 0) 943 goto fail; 944 } 945 946 return (0); 947 948fail: 949 while (i-- > 0) 950 sfxge_dma_free(&txq->tsoh_buffer[i]); 951 free(txq->tsoh_buffer, M_SFXGE); 952 txq->tsoh_buffer = NULL; 953 return (rc); 954} 955 956static void tso_fini(struct sfxge_txq *txq) 957{ 958 int i; 959 960 if (txq->tsoh_buffer != NULL) { 961 for (i = 0; i < TSOH_PAGE_COUNT(txq->sc->txq_entries); i++) 962 sfxge_dma_free(&txq->tsoh_buffer[i]); 963 free(txq->tsoh_buffer, M_SFXGE); 964 } 965} 966 967static void tso_start(struct sfxge_txq *txq, struct sfxge_tso_state *tso, 968 const bus_dma_segment_t *hdr_dma_seg, 969 struct mbuf *mbuf) 970{ 971 const efx_nic_cfg_t *encp = efx_nic_cfg_get(txq->sc->enp); 972#if !SFXGE_TX_PARSE_EARLY 973 struct ether_header *eh = mtod(mbuf, struct ether_header *); 974 const struct tcphdr *th; 975 struct tcphdr th_copy; 976#endif 977 978 tso->fw_assisted = txq->tso_fw_assisted; 979 tso->mbuf = mbuf; 980 981 /* Find network protocol and header */ 982#if !SFXGE_TX_PARSE_EARLY 983 tso->protocol = eh->ether_type; 984 if (tso->protocol == htons(ETHERTYPE_VLAN)) { 985 struct ether_vlan_header *veh = 986 mtod(mbuf, struct ether_vlan_header *); 987 tso->protocol = veh->evl_proto; 988 tso->nh_off = sizeof(*veh); 989 } else { 990 tso->nh_off = sizeof(*eh); 991 } 992#else 993 tso->protocol = TSO_MBUF_PROTO(mbuf); 994 tso->nh_off = mbuf->m_pkthdr.l2hlen; 995 tso->tcph_off = mbuf->m_pkthdr.l3hlen; 996 tso->packet_id = ntohs(TSO_MBUF_PACKETID(mbuf)); 997#endif 998 999#if !SFXGE_TX_PARSE_EARLY 1000 /* Find TCP header */ 1001 if (tso->protocol == htons(ETHERTYPE_IP)) { 1002 KASSERT(tso_iph(tso)->ip_p == IPPROTO_TCP, 1003 ("TSO required on non-TCP packet")); 1004 tso->tcph_off = tso->nh_off + 4 * tso_iph(tso)->ip_hl; 1005 tso->packet_id = ntohs(tso_iph(tso)->ip_id); 1006 } else { 1007 KASSERT(tso->protocol == htons(ETHERTYPE_IPV6), 1008 ("TSO required on non-IP packet")); 1009 KASSERT(tso_ip6h(tso)->ip6_nxt == IPPROTO_TCP, 1010 ("TSO required on non-TCP packet")); 1011 tso->tcph_off = tso->nh_off + sizeof(struct ip6_hdr); 1012 tso->packet_id = 0; 1013 } 1014#endif 1015 1016 1017 if (tso->fw_assisted && 1018 __predict_false(tso->tcph_off > 1019 encp->enc_tx_tso_tcp_header_offset_limit)) { 1020 tso->fw_assisted = 0; 1021 } 1022 1023 1024#if !SFXGE_TX_PARSE_EARLY 1025 KASSERT(mbuf->m_len >= tso->tcph_off, 1026 ("network header is fragmented in mbuf")); 1027 /* We need TCP header including flags (window is the next) */ 1028 if (mbuf->m_len < tso->tcph_off + offsetof(struct tcphdr, th_win)) { 1029 m_copydata(tso->mbuf, tso->tcph_off, sizeof(th_copy), 1030 (caddr_t)&th_copy); 1031 th = &th_copy; 1032 } else { 1033 th = tso_tcph(tso); 1034 } 1035 tso->header_len = tso->tcph_off + 4 * th->th_off; 1036#else 1037 tso->header_len = mbuf->m_pkthdr.l4hlen; 1038#endif 1039 tso->seg_size = mbuf->m_pkthdr.tso_segsz; 1040 1041#if !SFXGE_TX_PARSE_EARLY 1042 tso->seqnum = ntohl(th->th_seq); 1043 1044 /* These flags must not be duplicated */ 1045 /* 1046 * RST should not be duplicated as well, but FreeBSD kernel 1047 * generates TSO packets with RST flag. So, do not assert 1048 * its absence. 1049 */ 1050 KASSERT(!(th->th_flags & (TH_URG | TH_SYN)), 1051 ("incompatible TCP flag 0x%x on TSO packet", 1052 th->th_flags & (TH_URG | TH_SYN))); 1053 tso->tcp_flags = th->th_flags; 1054#else 1055 tso->seqnum = TSO_MBUF_SEQNUM(mbuf); 1056 tso->tcp_flags = TSO_MBUF_FLAGS(mbuf); 1057#endif 1058 1059 tso->out_len = mbuf->m_pkthdr.len - tso->header_len; 1060 1061 if (tso->fw_assisted) { 1062 if (hdr_dma_seg->ds_len >= tso->header_len) 1063 efx_tx_qdesc_dma_create(txq->common, 1064 hdr_dma_seg->ds_addr, 1065 tso->header_len, 1066 B_FALSE, 1067 &tso->header_desc); 1068 else 1069 tso->fw_assisted = 0; 1070 } 1071} 1072 1073/* 1074 * tso_fill_packet_with_fragment - form descriptors for the current fragment 1075 * 1076 * Form descriptors for the current fragment, until we reach the end 1077 * of fragment or end-of-packet. Return 0 on success, 1 if not enough 1078 * space. 1079 */ 1080static void tso_fill_packet_with_fragment(struct sfxge_txq *txq, 1081 struct sfxge_tso_state *tso) 1082{ 1083 efx_desc_t *desc; 1084 int n; 1085 uint64_t dma_addr = tso->dma_addr; 1086 boolean_t eop; 1087 1088 if (tso->in_len == 0 || tso->packet_space == 0) 1089 return; 1090 1091 KASSERT(tso->in_len > 0, ("TSO input length went negative")); 1092 KASSERT(tso->packet_space > 0, ("TSO packet space went negative")); 1093 1094 if (tso->fw_assisted & SFXGE_FATSOV2) { 1095 n = tso->in_len; 1096 tso->out_len -= n; 1097 tso->seqnum += n; 1098 tso->in_len = 0; 1099 if (n < tso->packet_space) { 1100 tso->packet_space -= n; 1101 tso->segs_space--; 1102 } else { 1103 tso->packet_space = tso->seg_size - 1104 (n - tso->packet_space) % tso->seg_size; 1105 tso->segs_space = 1106 EFX_TX_FATSOV2_DMA_SEGS_PER_PKT_MAX - 1 - 1107 (tso->packet_space != tso->seg_size); 1108 } 1109 } else { 1110 n = min(tso->in_len, tso->packet_space); 1111 tso->packet_space -= n; 1112 tso->out_len -= n; 1113 tso->dma_addr += n; 1114 tso->in_len -= n; 1115 } 1116 1117 /* 1118 * It is OK to use binary OR below to avoid extra branching 1119 * since all conditions may always be checked. 1120 */ 1121 eop = (tso->out_len == 0) | (tso->packet_space == 0) | 1122 (tso->segs_space == 0); 1123 1124 desc = &txq->pend_desc[txq->n_pend_desc++]; 1125 efx_tx_qdesc_dma_create(txq->common, dma_addr, n, eop, desc); 1126} 1127 1128/* Callback from bus_dmamap_load() for long TSO headers. */ 1129static void tso_map_long_header(void *dma_addr_ret, 1130 bus_dma_segment_t *segs, int nseg, 1131 int error) 1132{ 1133 *(uint64_t *)dma_addr_ret = ((__predict_true(error == 0) && 1134 __predict_true(nseg == 1)) ? 1135 segs->ds_addr : 0); 1136} 1137 1138/* 1139 * tso_start_new_packet - generate a new header and prepare for the new packet 1140 * 1141 * Generate a new header and prepare for the new packet. Return 0 on 1142 * success, or an error code if failed to alloc header. 1143 */ 1144static int tso_start_new_packet(struct sfxge_txq *txq, 1145 struct sfxge_tso_state *tso, 1146 unsigned int *idp) 1147{ 1148 unsigned int id = *idp; 1149 struct tcphdr *tsoh_th; 1150 unsigned ip_length; 1151 caddr_t header; 1152 uint64_t dma_addr; 1153 bus_dmamap_t map; 1154 efx_desc_t *desc; 1155 int rc; 1156 1157 if (tso->fw_assisted) { 1158 if (tso->fw_assisted & SFXGE_FATSOV2) { 1159 /* Add 2 FATSOv2 option descriptors */ 1160 desc = &txq->pend_desc[txq->n_pend_desc]; 1161 efx_tx_qdesc_tso2_create(txq->common, 1162 tso->packet_id, 1163 tso->seqnum, 1164 tso->seg_size, 1165 desc, 1166 EFX_TX_FATSOV2_OPT_NDESCS); 1167 desc += EFX_TX_FATSOV2_OPT_NDESCS; 1168 txq->n_pend_desc += EFX_TX_FATSOV2_OPT_NDESCS; 1169 KASSERT(txq->stmp[id].flags == 0, ("stmp flags are not 0")); 1170 id = (id + EFX_TX_FATSOV2_OPT_NDESCS) & txq->ptr_mask; 1171 1172 tso->segs_space = 1173 EFX_TX_FATSOV2_DMA_SEGS_PER_PKT_MAX - 1; 1174 } else { 1175 uint8_t tcp_flags = tso->tcp_flags; 1176 1177 if (tso->out_len > tso->seg_size) 1178 tcp_flags &= ~(TH_FIN | TH_PUSH); 1179 1180 /* Add FATSOv1 option descriptor */ 1181 desc = &txq->pend_desc[txq->n_pend_desc++]; 1182 efx_tx_qdesc_tso_create(txq->common, 1183 tso->packet_id, 1184 tso->seqnum, 1185 tcp_flags, 1186 desc++); 1187 KASSERT(txq->stmp[id].flags == 0, ("stmp flags are not 0")); 1188 id = (id + 1) & txq->ptr_mask; 1189 1190 tso->seqnum += tso->seg_size; 1191 tso->segs_space = UINT_MAX; 1192 } 1193 1194 /* Header DMA descriptor */ 1195 *desc = tso->header_desc; 1196 txq->n_pend_desc++; 1197 KASSERT(txq->stmp[id].flags == 0, ("stmp flags are not 0")); 1198 id = (id + 1) & txq->ptr_mask; 1199 } else { 1200 /* Allocate a DMA-mapped header buffer. */ 1201 if (__predict_true(tso->header_len <= TSOH_STD_SIZE)) { 1202 unsigned int page_index = (id / 2) / TSOH_PER_PAGE; 1203 unsigned int buf_index = (id / 2) % TSOH_PER_PAGE; 1204 1205 header = (txq->tsoh_buffer[page_index].esm_base + 1206 buf_index * TSOH_STD_SIZE); 1207 dma_addr = (txq->tsoh_buffer[page_index].esm_addr + 1208 buf_index * TSOH_STD_SIZE); 1209 map = txq->tsoh_buffer[page_index].esm_map; 1210 1211 KASSERT(txq->stmp[id].flags == 0, 1212 ("stmp flags are not 0")); 1213 } else { 1214 struct sfxge_tx_mapping *stmp = &txq->stmp[id]; 1215 1216 /* We cannot use bus_dmamem_alloc() as that may sleep */ 1217 header = malloc(tso->header_len, M_SFXGE, M_NOWAIT); 1218 if (__predict_false(!header)) 1219 return (ENOMEM); 1220 rc = bus_dmamap_load(txq->packet_dma_tag, stmp->map, 1221 header, tso->header_len, 1222 tso_map_long_header, &dma_addr, 1223 BUS_DMA_NOWAIT); 1224 if (__predict_false(dma_addr == 0)) { 1225 if (rc == 0) { 1226 /* Succeeded but got >1 segment */ 1227 bus_dmamap_unload(txq->packet_dma_tag, 1228 stmp->map); 1229 rc = EINVAL; 1230 } 1231 free(header, M_SFXGE); 1232 return (rc); 1233 } 1234 map = stmp->map; 1235 1236 txq->tso_long_headers++; 1237 stmp->u.heap_buf = header; 1238 stmp->flags = TX_BUF_UNMAP; 1239 } 1240 1241 tsoh_th = (struct tcphdr *)(header + tso->tcph_off); 1242 1243 /* Copy and update the headers. */ 1244 m_copydata(tso->mbuf, 0, tso->header_len, header); 1245 1246 tsoh_th->th_seq = htonl(tso->seqnum); 1247 tso->seqnum += tso->seg_size; 1248 if (tso->out_len > tso->seg_size) { 1249 /* This packet will not finish the TSO burst. */ 1250 ip_length = tso->header_len - tso->nh_off + tso->seg_size; 1251 tsoh_th->th_flags &= ~(TH_FIN | TH_PUSH); 1252 } else { 1253 /* This packet will be the last in the TSO burst. */ 1254 ip_length = tso->header_len - tso->nh_off + tso->out_len; 1255 } 1256 1257 if (tso->protocol == htons(ETHERTYPE_IP)) { 1258 struct ip *tsoh_iph = (struct ip *)(header + tso->nh_off); 1259 tsoh_iph->ip_len = htons(ip_length); 1260 /* XXX We should increment ip_id, but FreeBSD doesn't 1261 * currently allocate extra IDs for multiple segments. 1262 */ 1263 } else { 1264 struct ip6_hdr *tsoh_iph = 1265 (struct ip6_hdr *)(header + tso->nh_off); 1266 tsoh_iph->ip6_plen = htons(ip_length - sizeof(*tsoh_iph)); 1267 } 1268 1269 /* Make the header visible to the hardware. */ 1270 bus_dmamap_sync(txq->packet_dma_tag, map, BUS_DMASYNC_PREWRITE); 1271 1272 /* Form a descriptor for this header. */ 1273 desc = &txq->pend_desc[txq->n_pend_desc++]; 1274 efx_tx_qdesc_dma_create(txq->common, 1275 dma_addr, 1276 tso->header_len, 1277 0, 1278 desc); 1279 id = (id + 1) & txq->ptr_mask; 1280 1281 tso->segs_space = UINT_MAX; 1282 } 1283 tso->packet_space = tso->seg_size; 1284 txq->tso_packets++; 1285 *idp = id; 1286 1287 return (0); 1288} 1289 1290static int 1291sfxge_tx_queue_tso(struct sfxge_txq *txq, struct mbuf *mbuf, 1292 const bus_dma_segment_t *dma_seg, int n_dma_seg, 1293 int vlan_tagged) 1294{ 1295 struct sfxge_tso_state tso; 1296 unsigned int id; 1297 unsigned skipped = 0; 1298 1299 tso_start(txq, &tso, dma_seg, mbuf); 1300 1301 while (dma_seg->ds_len + skipped <= tso.header_len) { 1302 skipped += dma_seg->ds_len; 1303 --n_dma_seg; 1304 KASSERT(n_dma_seg, ("no payload found in TSO packet")); 1305 ++dma_seg; 1306 } 1307 tso.in_len = dma_seg->ds_len - (tso.header_len - skipped); 1308 tso.dma_addr = dma_seg->ds_addr + (tso.header_len - skipped); 1309 1310 id = (txq->added + vlan_tagged) & txq->ptr_mask; 1311 if (__predict_false(tso_start_new_packet(txq, &tso, &id))) 1312 return (-1); 1313 1314 while (1) { 1315 tso_fill_packet_with_fragment(txq, &tso); 1316 /* Exactly one DMA descriptor is added */ 1317 KASSERT(txq->stmp[id].flags == 0, ("stmp flags are not 0")); 1318 id = (id + 1) & txq->ptr_mask; 1319 1320 /* Move onto the next fragment? */ 1321 if (tso.in_len == 0) { 1322 --n_dma_seg; 1323 if (n_dma_seg == 0) 1324 break; 1325 ++dma_seg; 1326 tso.in_len = dma_seg->ds_len; 1327 tso.dma_addr = dma_seg->ds_addr; 1328 } 1329 1330 /* End of packet? */ 1331 if ((tso.packet_space == 0) | (tso.segs_space == 0)) { 1332 unsigned int n_fatso_opt_desc = 1333 (tso.fw_assisted & SFXGE_FATSOV2) ? 1334 EFX_TX_FATSOV2_OPT_NDESCS : 1335 (tso.fw_assisted & SFXGE_FATSOV1) ? 1 : 0; 1336 1337 /* If the queue is now full due to tiny MSS, 1338 * or we can't create another header, discard 1339 * the remainder of the input mbuf but do not 1340 * roll back the work we have done. 1341 */ 1342 if (txq->n_pend_desc + n_fatso_opt_desc + 1343 1 /* header */ + n_dma_seg > txq->max_pkt_desc) { 1344 txq->tso_pdrop_too_many++; 1345 break; 1346 } 1347 if (__predict_false(tso_start_new_packet(txq, &tso, 1348 &id))) { 1349 txq->tso_pdrop_no_rsrc++; 1350 break; 1351 } 1352 } 1353 } 1354 1355 txq->tso_bursts++; 1356 return (id); 1357} 1358 1359static void 1360sfxge_tx_qunblock(struct sfxge_txq *txq) 1361{ 1362 struct sfxge_softc *sc; 1363 struct sfxge_evq *evq; 1364 1365 sc = txq->sc; 1366 evq = sc->evq[txq->evq_index]; 1367 1368 SFXGE_EVQ_LOCK_ASSERT_OWNED(evq); 1369 1370 if (__predict_false(txq->init_state != SFXGE_TXQ_STARTED)) 1371 return; 1372 1373 SFXGE_TXQ_LOCK(txq); 1374 1375 if (txq->blocked) { 1376 unsigned int level; 1377 1378 level = txq->added - txq->completed; 1379 if (level <= SFXGE_TXQ_UNBLOCK_LEVEL(txq->entries)) { 1380 /* reaped must be in sync with blocked */ 1381 sfxge_tx_qreap(txq); 1382 txq->blocked = 0; 1383 } 1384 } 1385 1386 sfxge_tx_qdpl_service(txq); 1387 /* note: lock has been dropped */ 1388} 1389 1390void 1391sfxge_tx_qflush_done(struct sfxge_txq *txq) 1392{ 1393 1394 txq->flush_state = SFXGE_FLUSH_DONE; 1395} 1396 1397static void 1398sfxge_tx_qstop(struct sfxge_softc *sc, unsigned int index) 1399{ 1400 struct sfxge_txq *txq; 1401 struct sfxge_evq *evq; 1402 unsigned int count; 1403 1404 SFXGE_ADAPTER_LOCK_ASSERT_OWNED(sc); 1405 1406 txq = sc->txq[index]; 1407 evq = sc->evq[txq->evq_index]; 1408 1409 SFXGE_EVQ_LOCK(evq); 1410 SFXGE_TXQ_LOCK(txq); 1411 1412 KASSERT(txq->init_state == SFXGE_TXQ_STARTED, 1413 ("txq->init_state != SFXGE_TXQ_STARTED")); 1414 1415 txq->init_state = SFXGE_TXQ_INITIALIZED; 1416 1417 if (txq->flush_state != SFXGE_FLUSH_DONE) { 1418 txq->flush_state = SFXGE_FLUSH_PENDING; 1419 1420 SFXGE_EVQ_UNLOCK(evq); 1421 SFXGE_TXQ_UNLOCK(txq); 1422 1423 /* Flush the transmit queue. */ 1424 if (efx_tx_qflush(txq->common) != 0) { 1425 log(LOG_ERR, "%s: Flushing Tx queue %u failed\n", 1426 device_get_nameunit(sc->dev), index); 1427 txq->flush_state = SFXGE_FLUSH_DONE; 1428 } else { 1429 count = 0; 1430 do { 1431 /* Spin for 100ms. */ 1432 DELAY(100000); 1433 if (txq->flush_state != SFXGE_FLUSH_PENDING) 1434 break; 1435 } while (++count < 20); 1436 } 1437 SFXGE_EVQ_LOCK(evq); 1438 SFXGE_TXQ_LOCK(txq); 1439 1440 KASSERT(txq->flush_state != SFXGE_FLUSH_FAILED, 1441 ("txq->flush_state == SFXGE_FLUSH_FAILED")); 1442 1443 if (txq->flush_state != SFXGE_FLUSH_DONE) { 1444 /* Flush timeout */ 1445 log(LOG_ERR, "%s: Cannot flush Tx queue %u\n", 1446 device_get_nameunit(sc->dev), index); 1447 txq->flush_state = SFXGE_FLUSH_DONE; 1448 } 1449 } 1450 1451 txq->blocked = 0; 1452 txq->pending = txq->added; 1453 1454 sfxge_tx_qcomplete(txq, evq); 1455 KASSERT(txq->completed == txq->added, 1456 ("txq->completed != txq->added")); 1457 1458 sfxge_tx_qreap(txq); 1459 KASSERT(txq->reaped == txq->completed, 1460 ("txq->reaped != txq->completed")); 1461 1462 txq->added = 0; 1463 txq->pending = 0; 1464 txq->completed = 0; 1465 txq->reaped = 0; 1466 1467 /* Destroy the common code transmit queue. */ 1468 efx_tx_qdestroy(txq->common); 1469 txq->common = NULL; 1470 1471 efx_sram_buf_tbl_clear(sc->enp, txq->buf_base_id, 1472 EFX_TXQ_NBUFS(sc->txq_entries)); 1473 1474 SFXGE_EVQ_UNLOCK(evq); 1475 SFXGE_TXQ_UNLOCK(txq); 1476} 1477 1478/* 1479 * Estimate maximum number of Tx descriptors required for TSO packet. 1480 * With minimum MSS and maximum mbuf length we might need more (even 1481 * than a ring-ful of descriptors), but this should not happen in 1482 * practice except due to deliberate attack. In that case we will 1483 * truncate the output at a packet boundary. 1484 */ 1485static unsigned int 1486sfxge_tx_max_pkt_desc(const struct sfxge_softc *sc, enum sfxge_txq_type type, 1487 unsigned int tso_fw_assisted) 1488{ 1489 /* One descriptor for every input fragment */ 1490 unsigned int max_descs = SFXGE_TX_MAPPING_MAX_SEG; 1491 unsigned int sw_tso_max_descs; 1492 unsigned int fa_tso_v1_max_descs = 0; 1493 unsigned int fa_tso_v2_max_descs = 0; 1494 1495 /* VLAN tagging Tx option descriptor may be required */ 1496 if (efx_nic_cfg_get(sc->enp)->enc_hw_tx_insert_vlan_enabled) 1497 max_descs++; 1498 1499 if (type == SFXGE_TXQ_IP_TCP_UDP_CKSUM) { 1500 /* 1501 * Plus header and payload descriptor for each output segment. 1502 * Minus one since header fragment is already counted. 1503 * Even if FATSO is used, we should be ready to fallback 1504 * to do it in the driver. 1505 */ 1506 sw_tso_max_descs = SFXGE_TSO_MAX_SEGS * 2 - 1; 1507 1508 /* FW assisted TSOv1 requires one more descriptor per segment 1509 * in comparison to SW TSO */ 1510 if (tso_fw_assisted & SFXGE_FATSOV1) 1511 fa_tso_v1_max_descs = 1512 sw_tso_max_descs + SFXGE_TSO_MAX_SEGS; 1513 1514 /* FW assisted TSOv2 requires 3 (2 FATSO plus header) extra 1515 * descriptors per superframe limited by number of DMA fetches 1516 * per packet. The first packet header is already counted. 1517 */ 1518 if (tso_fw_assisted & SFXGE_FATSOV2) { 1519 fa_tso_v2_max_descs = 1520 howmany(SFXGE_TX_MAPPING_MAX_SEG, 1521 EFX_TX_FATSOV2_DMA_SEGS_PER_PKT_MAX - 1) * 1522 (EFX_TX_FATSOV2_OPT_NDESCS + 1) - 1; 1523 } 1524 1525 max_descs += MAX(sw_tso_max_descs, 1526 MAX(fa_tso_v1_max_descs, fa_tso_v2_max_descs)); 1527 } 1528 1529 return (max_descs); 1530} 1531 1532static int 1533sfxge_tx_qstart(struct sfxge_softc *sc, unsigned int index) 1534{ 1535 struct sfxge_txq *txq; 1536 efsys_mem_t *esmp; 1537 uint16_t flags; 1538 unsigned int tso_fw_assisted; 1539 struct sfxge_evq *evq; 1540 unsigned int desc_index; 1541 int rc; 1542 1543 SFXGE_ADAPTER_LOCK_ASSERT_OWNED(sc); 1544 1545 txq = sc->txq[index]; 1546 esmp = &txq->mem; 1547 evq = sc->evq[txq->evq_index]; 1548 1549 KASSERT(txq->init_state == SFXGE_TXQ_INITIALIZED, 1550 ("txq->init_state != SFXGE_TXQ_INITIALIZED")); 1551 KASSERT(evq->init_state == SFXGE_EVQ_STARTED, 1552 ("evq->init_state != SFXGE_EVQ_STARTED")); 1553 1554 /* Program the buffer table. */ 1555 if ((rc = efx_sram_buf_tbl_set(sc->enp, txq->buf_base_id, esmp, 1556 EFX_TXQ_NBUFS(sc->txq_entries))) != 0) 1557 return (rc); 1558 1559 /* Determine the kind of queue we are creating. */ 1560 tso_fw_assisted = 0; 1561 switch (txq->type) { 1562 case SFXGE_TXQ_NON_CKSUM: 1563 flags = 0; 1564 break; 1565 case SFXGE_TXQ_IP_CKSUM: 1566 flags = EFX_TXQ_CKSUM_IPV4; 1567 break; 1568 case SFXGE_TXQ_IP_TCP_UDP_CKSUM: 1569 flags = EFX_TXQ_CKSUM_IPV4 | EFX_TXQ_CKSUM_TCPUDP; 1570 tso_fw_assisted = sc->tso_fw_assisted; 1571 if (tso_fw_assisted & SFXGE_FATSOV2) 1572 flags |= EFX_TXQ_FATSOV2; 1573 break; 1574 default: 1575 KASSERT(0, ("Impossible TX queue")); 1576 flags = 0; 1577 break; 1578 } 1579 1580 /* Create the common code transmit queue. */ 1581 if ((rc = efx_tx_qcreate(sc->enp, index, txq->type, esmp, 1582 sc->txq_entries, txq->buf_base_id, flags, evq->common, 1583 &txq->common, &desc_index)) != 0) { 1584 /* Retry if no FATSOv2 resources, otherwise fail */ 1585 if ((rc != ENOSPC) || (~flags & EFX_TXQ_FATSOV2)) 1586 goto fail; 1587 1588 /* Looks like all FATSOv2 contexts are used */ 1589 flags &= ~EFX_TXQ_FATSOV2; 1590 tso_fw_assisted &= ~SFXGE_FATSOV2; 1591 if ((rc = efx_tx_qcreate(sc->enp, index, txq->type, esmp, 1592 sc->txq_entries, txq->buf_base_id, flags, evq->common, 1593 &txq->common, &desc_index)) != 0) 1594 goto fail; 1595 } 1596 1597 /* Initialise queue descriptor indexes */ 1598 txq->added = txq->pending = txq->completed = txq->reaped = desc_index; 1599 1600 SFXGE_TXQ_LOCK(txq); 1601 1602 /* Enable the transmit queue. */ 1603 efx_tx_qenable(txq->common); 1604 1605 txq->init_state = SFXGE_TXQ_STARTED; 1606 txq->flush_state = SFXGE_FLUSH_REQUIRED; 1607 txq->tso_fw_assisted = tso_fw_assisted; 1608 1609 txq->max_pkt_desc = sfxge_tx_max_pkt_desc(sc, txq->type, 1610 tso_fw_assisted); 1611 1612 SFXGE_TXQ_UNLOCK(txq); 1613 1614 return (0); 1615 1616fail: 1617 efx_sram_buf_tbl_clear(sc->enp, txq->buf_base_id, 1618 EFX_TXQ_NBUFS(sc->txq_entries)); 1619 return (rc); 1620} 1621 1622void 1623sfxge_tx_stop(struct sfxge_softc *sc) 1624{ 1625 int index; 1626 1627 index = sc->txq_count; 1628 while (--index >= 0) 1629 sfxge_tx_qstop(sc, index); 1630 1631 /* Tear down the transmit module */ 1632 efx_tx_fini(sc->enp); 1633} 1634 1635int 1636sfxge_tx_start(struct sfxge_softc *sc) 1637{ 1638 int index; 1639 int rc; 1640 1641 /* Initialize the common code transmit module. */ 1642 if ((rc = efx_tx_init(sc->enp)) != 0) 1643 return (rc); 1644 1645 for (index = 0; index < sc->txq_count; index++) { 1646 if ((rc = sfxge_tx_qstart(sc, index)) != 0) 1647 goto fail; 1648 } 1649 1650 return (0); 1651 1652fail: 1653 while (--index >= 0) 1654 sfxge_tx_qstop(sc, index); 1655 1656 efx_tx_fini(sc->enp); 1657 1658 return (rc); 1659} 1660 1661static int 1662sfxge_txq_stat_init(struct sfxge_txq *txq, struct sysctl_oid *txq_node) 1663{ 1664 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(txq->sc->dev); 1665 struct sysctl_oid *stat_node; 1666 unsigned int id; 1667 1668 stat_node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(txq_node), OID_AUTO, 1669 "stats", CTLFLAG_RD, NULL, 1670 "Tx queue statistics"); 1671 if (stat_node == NULL) 1672 return (ENOMEM); 1673 1674 for (id = 0; id < nitems(sfxge_tx_stats); id++) { 1675 SYSCTL_ADD_ULONG( 1676 ctx, SYSCTL_CHILDREN(stat_node), OID_AUTO, 1677 sfxge_tx_stats[id].name, CTLFLAG_RD | CTLFLAG_STATS, 1678 (unsigned long *)((caddr_t)txq + sfxge_tx_stats[id].offset), 1679 ""); 1680 } 1681 1682 return (0); 1683} 1684 1685/** 1686 * Destroy a transmit queue. 1687 */ 1688static void 1689sfxge_tx_qfini(struct sfxge_softc *sc, unsigned int index) 1690{ 1691 struct sfxge_txq *txq; 1692 unsigned int nmaps; 1693 1694 txq = sc->txq[index]; 1695 1696 KASSERT(txq->init_state == SFXGE_TXQ_INITIALIZED, 1697 ("txq->init_state != SFXGE_TXQ_INITIALIZED")); 1698 1699 if (txq->type == SFXGE_TXQ_IP_TCP_UDP_CKSUM) 1700 tso_fini(txq); 1701 1702 /* Free the context arrays. */ 1703 free(txq->pend_desc, M_SFXGE); 1704 nmaps = sc->txq_entries; 1705 while (nmaps-- != 0) 1706 bus_dmamap_destroy(txq->packet_dma_tag, txq->stmp[nmaps].map); 1707 free(txq->stmp, M_SFXGE); 1708 1709 /* Release DMA memory mapping. */ 1710 sfxge_dma_free(&txq->mem); 1711 1712 sc->txq[index] = NULL; 1713 1714 SFXGE_TXQ_LOCK_DESTROY(txq); 1715 1716 free(txq, M_SFXGE); 1717} 1718 1719static int 1720sfxge_tx_qinit(struct sfxge_softc *sc, unsigned int txq_index, 1721 enum sfxge_txq_type type, unsigned int evq_index) 1722{ 1723 char name[16]; 1724 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev); 1725 struct sysctl_oid *txq_node; 1726 struct sfxge_txq *txq; 1727 struct sfxge_evq *evq; 1728 struct sfxge_tx_dpl *stdp; 1729 struct sysctl_oid *dpl_node; 1730 efsys_mem_t *esmp; 1731 unsigned int nmaps; 1732 int rc; 1733 1734 txq = malloc(sizeof(struct sfxge_txq), M_SFXGE, M_ZERO | M_WAITOK); 1735 txq->sc = sc; 1736 txq->entries = sc->txq_entries; 1737 txq->ptr_mask = txq->entries - 1; 1738 1739 sc->txq[txq_index] = txq; 1740 esmp = &txq->mem; 1741 1742 evq = sc->evq[evq_index]; 1743 1744 /* Allocate and zero DMA space for the descriptor ring. */ 1745 if ((rc = sfxge_dma_alloc(sc, EFX_TXQ_SIZE(sc->txq_entries), esmp)) != 0) 1746 return (rc); 1747 1748 /* Allocate buffer table entries. */ 1749 sfxge_sram_buf_tbl_alloc(sc, EFX_TXQ_NBUFS(sc->txq_entries), 1750 &txq->buf_base_id); 1751 1752 /* Create a DMA tag for packet mappings. */ 1753 if (bus_dma_tag_create(sc->parent_dma_tag, 1, 0x1000, 1754 MIN(0x3FFFFFFFFFFFUL, BUS_SPACE_MAXADDR), BUS_SPACE_MAXADDR, NULL, 1755 NULL, 0x11000, SFXGE_TX_MAPPING_MAX_SEG, 0x1000, 0, NULL, NULL, 1756 &txq->packet_dma_tag) != 0) { 1757 device_printf(sc->dev, "Couldn't allocate txq DMA tag\n"); 1758 rc = ENOMEM; 1759 goto fail; 1760 } 1761 1762 /* Allocate pending descriptor array for batching writes. */ 1763 txq->pend_desc = malloc(sizeof(efx_desc_t) * sc->txq_entries, 1764 M_SFXGE, M_ZERO | M_WAITOK); 1765 1766 /* Allocate and initialise mbuf DMA mapping array. */ 1767 txq->stmp = malloc(sizeof(struct sfxge_tx_mapping) * sc->txq_entries, 1768 M_SFXGE, M_ZERO | M_WAITOK); 1769 for (nmaps = 0; nmaps < sc->txq_entries; nmaps++) { 1770 rc = bus_dmamap_create(txq->packet_dma_tag, 0, 1771 &txq->stmp[nmaps].map); 1772 if (rc != 0) 1773 goto fail2; 1774 } 1775 1776 snprintf(name, sizeof(name), "%u", txq_index); 1777 txq_node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(sc->txqs_node), 1778 OID_AUTO, name, CTLFLAG_RD, NULL, ""); 1779 if (txq_node == NULL) { 1780 rc = ENOMEM; 1781 goto fail_txq_node; 1782 } 1783 1784 if (type == SFXGE_TXQ_IP_TCP_UDP_CKSUM && 1785 (rc = tso_init(txq)) != 0) 1786 goto fail3; 1787 1788 /* Initialize the deferred packet list. */ 1789 stdp = &txq->dpl; 1790 stdp->std_put_max = sfxge_tx_dpl_put_max; 1791 stdp->std_get_max = sfxge_tx_dpl_get_max; 1792 stdp->std_get_non_tcp_max = sfxge_tx_dpl_get_non_tcp_max; 1793 stdp->std_getp = &stdp->std_get; 1794 1795 SFXGE_TXQ_LOCK_INIT(txq, device_get_nameunit(sc->dev), txq_index); 1796 1797 dpl_node = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(txq_node), OID_AUTO, 1798 "dpl", CTLFLAG_RD, NULL, 1799 "Deferred packet list statistics"); 1800 if (dpl_node == NULL) { 1801 rc = ENOMEM; 1802 goto fail_dpl_node; 1803 } 1804 1805 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(dpl_node), OID_AUTO, 1806 "get_count", CTLFLAG_RD | CTLFLAG_STATS, 1807 &stdp->std_get_count, 0, ""); 1808 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(dpl_node), OID_AUTO, 1809 "get_non_tcp_count", CTLFLAG_RD | CTLFLAG_STATS, 1810 &stdp->std_get_non_tcp_count, 0, ""); 1811 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(dpl_node), OID_AUTO, 1812 "get_hiwat", CTLFLAG_RD | CTLFLAG_STATS, 1813 &stdp->std_get_hiwat, 0, ""); 1814 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(dpl_node), OID_AUTO, 1815 "put_hiwat", CTLFLAG_RD | CTLFLAG_STATS, 1816 &stdp->std_put_hiwat, 0, ""); 1817 1818 rc = sfxge_txq_stat_init(txq, txq_node); 1819 if (rc != 0) 1820 goto fail_txq_stat_init; 1821 1822 txq->type = type; 1823 txq->evq_index = evq_index; 1824 txq->txq_index = txq_index; 1825 txq->init_state = SFXGE_TXQ_INITIALIZED; 1826 txq->hw_vlan_tci = 0; 1827 1828 return (0); 1829 1830fail_txq_stat_init: 1831fail_dpl_node: 1832fail3: 1833fail_txq_node: 1834 free(txq->pend_desc, M_SFXGE); 1835fail2: 1836 while (nmaps-- != 0) 1837 bus_dmamap_destroy(txq->packet_dma_tag, txq->stmp[nmaps].map); 1838 free(txq->stmp, M_SFXGE); 1839 bus_dma_tag_destroy(txq->packet_dma_tag); 1840 1841fail: 1842 sfxge_dma_free(esmp); 1843 1844 return (rc); 1845} 1846 1847static int 1848sfxge_tx_stat_handler(SYSCTL_HANDLER_ARGS) 1849{ 1850 struct sfxge_softc *sc = arg1; 1851 unsigned int id = arg2; 1852 unsigned long sum; 1853 unsigned int index; 1854 1855 /* Sum across all TX queues */ 1856 sum = 0; 1857 for (index = 0; index < sc->txq_count; index++) 1858 sum += *(unsigned long *)((caddr_t)sc->txq[index] + 1859 sfxge_tx_stats[id].offset); 1860 1861 return (SYSCTL_OUT(req, &sum, sizeof(sum))); 1862} 1863 1864static void 1865sfxge_tx_stat_init(struct sfxge_softc *sc) 1866{ 1867 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev); 1868 struct sysctl_oid_list *stat_list; 1869 unsigned int id; 1870 1871 stat_list = SYSCTL_CHILDREN(sc->stats_node); 1872 1873 for (id = 0; id < nitems(sfxge_tx_stats); id++) { 1874 SYSCTL_ADD_PROC( 1875 ctx, stat_list, 1876 OID_AUTO, sfxge_tx_stats[id].name, 1877 CTLTYPE_ULONG|CTLFLAG_RD, 1878 sc, id, sfxge_tx_stat_handler, "LU", 1879 ""); 1880 } 1881} 1882 1883uint64_t 1884sfxge_tx_get_drops(struct sfxge_softc *sc) 1885{ 1886 unsigned int index; 1887 uint64_t drops = 0; 1888 struct sfxge_txq *txq; 1889 1890 /* Sum across all TX queues */ 1891 for (index = 0; index < sc->txq_count; index++) { 1892 txq = sc->txq[index]; 1893 /* 1894 * In theory, txq->put_overflow and txq->netdown_drops 1895 * should use atomic operation and other should be 1896 * obtained under txq lock, but it is just statistics. 1897 */ 1898 drops += txq->drops + txq->get_overflow + 1899 txq->get_non_tcp_overflow + 1900 txq->put_overflow + txq->netdown_drops + 1901 txq->tso_pdrop_too_many + txq->tso_pdrop_no_rsrc; 1902 } 1903 return (drops); 1904} 1905 1906void 1907sfxge_tx_fini(struct sfxge_softc *sc) 1908{ 1909 int index; 1910 1911 index = sc->txq_count; 1912 while (--index >= 0) 1913 sfxge_tx_qfini(sc, index); 1914 1915 sc->txq_count = 0; 1916} 1917 1918 1919int 1920sfxge_tx_init(struct sfxge_softc *sc) 1921{ 1922 const efx_nic_cfg_t *encp = efx_nic_cfg_get(sc->enp); 1923 struct sfxge_intr *intr; 1924 int index; 1925 int rc; 1926 1927 intr = &sc->intr; 1928 1929 KASSERT(intr->state == SFXGE_INTR_INITIALIZED, 1930 ("intr->state != SFXGE_INTR_INITIALIZED")); 1931 1932 if (sfxge_tx_dpl_get_max <= 0) { 1933 log(LOG_ERR, "%s=%d must be greater than 0", 1934 SFXGE_PARAM_TX_DPL_GET_MAX, sfxge_tx_dpl_get_max); 1935 rc = EINVAL; 1936 goto fail_tx_dpl_get_max; 1937 } 1938 if (sfxge_tx_dpl_get_non_tcp_max <= 0) { 1939 log(LOG_ERR, "%s=%d must be greater than 0", 1940 SFXGE_PARAM_TX_DPL_GET_NON_TCP_MAX, 1941 sfxge_tx_dpl_get_non_tcp_max); 1942 rc = EINVAL; 1943 goto fail_tx_dpl_get_non_tcp_max; 1944 } 1945 if (sfxge_tx_dpl_put_max < 0) { 1946 log(LOG_ERR, "%s=%d must be greater or equal to 0", 1947 SFXGE_PARAM_TX_DPL_PUT_MAX, sfxge_tx_dpl_put_max); 1948 rc = EINVAL; 1949 goto fail_tx_dpl_put_max; 1950 } 1951 1952 sc->txq_count = SFXGE_TXQ_NTYPES - 1 + sc->intr.n_alloc; 1953 1954 sc->tso_fw_assisted = sfxge_tso_fw_assisted; 1955 if ((~encp->enc_features & EFX_FEATURE_FW_ASSISTED_TSO) || 1956 (!encp->enc_fw_assisted_tso_enabled)) 1957 sc->tso_fw_assisted &= ~SFXGE_FATSOV1; 1958 if ((~encp->enc_features & EFX_FEATURE_FW_ASSISTED_TSO_V2) || 1959 (!encp->enc_fw_assisted_tso_v2_enabled)) 1960 sc->tso_fw_assisted &= ~SFXGE_FATSOV2; 1961 1962 sc->txqs_node = SYSCTL_ADD_NODE( 1963 device_get_sysctl_ctx(sc->dev), 1964 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)), 1965 OID_AUTO, "txq", CTLFLAG_RD, NULL, "Tx queues"); 1966 if (sc->txqs_node == NULL) { 1967 rc = ENOMEM; 1968 goto fail_txq_node; 1969 } 1970 1971 /* Initialize the transmit queues */ 1972 if ((rc = sfxge_tx_qinit(sc, SFXGE_TXQ_NON_CKSUM, 1973 SFXGE_TXQ_NON_CKSUM, 0)) != 0) 1974 goto fail; 1975 1976 if ((rc = sfxge_tx_qinit(sc, SFXGE_TXQ_IP_CKSUM, 1977 SFXGE_TXQ_IP_CKSUM, 0)) != 0) 1978 goto fail2; 1979 1980 for (index = 0; 1981 index < sc->txq_count - SFXGE_TXQ_NTYPES + 1; 1982 index++) { 1983 if ((rc = sfxge_tx_qinit(sc, SFXGE_TXQ_NTYPES - 1 + index, 1984 SFXGE_TXQ_IP_TCP_UDP_CKSUM, index)) != 0) 1985 goto fail3; 1986 } 1987 1988 sfxge_tx_stat_init(sc); 1989 1990 return (0); 1991 1992fail3: 1993 while (--index >= 0) 1994 sfxge_tx_qfini(sc, SFXGE_TXQ_IP_TCP_UDP_CKSUM + index); 1995 1996 sfxge_tx_qfini(sc, SFXGE_TXQ_IP_CKSUM); 1997 1998fail2: 1999 sfxge_tx_qfini(sc, SFXGE_TXQ_NON_CKSUM); 2000 2001fail: 2002fail_txq_node: 2003 sc->txq_count = 0; 2004fail_tx_dpl_put_max: 2005fail_tx_dpl_get_non_tcp_max: 2006fail_tx_dpl_get_max: 2007 return (rc); 2008} 2009