1 /*- 2 * Copyright (c) 2012 Chelsio Communications, Inc. 3 * All rights reserved. 4 * Written by: Navdeep Parhar <np@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include "opt_inet.h" 32 33 #include <sys/param.h> 34 #include <sys/aio.h> 35 #include <sys/file.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/ktr.h> 39 #include <sys/module.h> 40 #include <sys/protosw.h> 41 #include <sys/proc.h> 42 #include <sys/domain.h> 43 #include <sys/socket.h> 44 #include <sys/socketvar.h> 45 #include <sys/taskqueue.h> 46 #include <sys/uio.h> 47 #include <netinet/in.h> 48 #include <netinet/in_pcb.h> 49 #include <netinet/ip.h> 50 #include <netinet/tcp_var.h> 51 #define TCPSTATES 52 #include <netinet/tcp_fsm.h> 53 #include <netinet/toecore.h> 54 55 #include <vm/vm.h> 56 #include <vm/vm_extern.h> 57 #include <vm/vm_param.h> 58 #include <vm/pmap.h> 59 #include <vm/vm_map.h> 60 #include <vm/vm_page.h> 61 #include <vm/vm_object.h> 62 63 #ifdef TCP_OFFLOAD 64 #include "common/common.h" 65 #include "common/t4_msg.h" 66 #include "common/t4_regs.h" 67 #include "common/t4_tcb.h" 68 #include "tom/t4_tom.h" 69 70 VNET_DECLARE(int, tcp_do_autorcvbuf); 71 #define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf) 72 VNET_DECLARE(int, tcp_autorcvbuf_inc); 73 #define V_tcp_autorcvbuf_inc VNET(tcp_autorcvbuf_inc) 74 VNET_DECLARE(int, tcp_autorcvbuf_max); 75 #define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max) 76 77 static void aio_ddp_requeue_task(void *context, int pending); 78 static void ddp_complete_all(struct toepcb *toep, int error); 79 static void t4_aio_cancel_active(struct kaiocb *job); 80 static void t4_aio_cancel_queued(struct kaiocb *job); 81 82 #define PPOD_SZ(n) ((n) * sizeof(struct pagepod)) 83 #define PPOD_SIZE (PPOD_SZ(1)) 84 85 /* XXX: must match A_ULP_RX_TDDP_PSZ */ 86 static int t4_ddp_pgsz[] = {4096, 4096 << 2, 4096 << 4, 4096 << 6}; 87 88 static TAILQ_HEAD(, pageset) ddp_orphan_pagesets; 89 static struct mtx ddp_orphan_pagesets_lock; 90 static struct task ddp_orphan_task; 91 92 #define MAX_DDP_BUFFER_SIZE (M_TCB_RX_DDP_BUF0_LEN) 93 static int 94 alloc_ppods(struct tom_data *td, int n, u_int *ppod_addr) 95 { 96 vmem_addr_t v; 97 int rc; 98 99 MPASS(n > 0); 100 101 rc = vmem_alloc(td->ppod_arena, PPOD_SZ(n), M_NOWAIT | M_FIRSTFIT, &v); 102 *ppod_addr = (u_int)v; 103 104 return (rc); 105 } 106 107 static void 108 free_ppods(struct tom_data *td, u_int ppod_addr, int n) 109 { 110 111 MPASS(n > 0); 112 113 vmem_free(td->ppod_arena, (vmem_addr_t)ppod_addr, PPOD_SZ(n)); 114 } 115 116 static inline int 117 pages_to_nppods(int npages, int ddp_pgsz) 118 { 119 int nsegs = npages * PAGE_SIZE / ddp_pgsz; 120 121 return (howmany(nsegs, PPOD_PAGES)); 122 } 123 124 /* 125 * A page set holds information about a buffer used for DDP. The page 126 * set holds resources such as the VM pages backing the buffer (either 127 * held or wired) and the page pods associated with the buffer. 128 * Recently used page sets are cached to allow for efficient reuse of 129 * buffers (avoiding the need to re-fault in pages, hold them, etc.). 130 * Note that cached page sets keep the backing pages wired. The 131 * number of wired pages is capped by only allowing for two wired 132 * pagesets per connection. This is not a perfect cap, but is a 133 * trade-off for performance. 134 * 135 * If an application ping-pongs two buffers for a connection via 136 * aio_read(2) then those buffers should remain wired and expensive VM 137 * fault lookups should be avoided after each buffer has been used 138 * once. If an application uses more than two buffers then this will 139 * fall back to doing expensive VM fault lookups for each operation. 140 */ 141 static void 142 free_pageset(struct tom_data *td, struct pageset *ps) 143 { 144 vm_page_t p; 145 int i; 146 147 if (ps->nppods > 0) 148 free_ppods(td, ps->ppod_addr, ps->nppods); 149 150 if (ps->flags & PS_WIRED) { 151 for (i = 0; i < ps->npages; i++) { 152 p = ps->pages[i]; 153 vm_page_lock(p); 154 vm_page_unwire(p, PQ_INACTIVE); 155 vm_page_unlock(p); 156 } 157 } else 158 vm_page_unhold_pages(ps->pages, ps->npages); 159 mtx_lock(&ddp_orphan_pagesets_lock); 160 TAILQ_INSERT_TAIL(&ddp_orphan_pagesets, ps, link); 161 taskqueue_enqueue(taskqueue_thread, &ddp_orphan_task); 162 mtx_unlock(&ddp_orphan_pagesets_lock); 163 } 164 165 static void 166 ddp_free_orphan_pagesets(void *context, int pending) 167 { 168 struct pageset *ps; 169 170 mtx_lock(&ddp_orphan_pagesets_lock); 171 while (!TAILQ_EMPTY(&ddp_orphan_pagesets)) { 172 ps = TAILQ_FIRST(&ddp_orphan_pagesets); 173 TAILQ_REMOVE(&ddp_orphan_pagesets, ps, link); 174 mtx_unlock(&ddp_orphan_pagesets_lock); 175 if (ps->vm) 176 vmspace_free(ps->vm); 177 free(ps, M_CXGBE); 178 mtx_lock(&ddp_orphan_pagesets_lock); 179 } 180 mtx_unlock(&ddp_orphan_pagesets_lock); 181 } 182 183 static void 184 recycle_pageset(struct toepcb *toep, struct pageset *ps) 185 { 186 187 DDP_ASSERT_LOCKED(toep); 188 if (!(toep->ddp_flags & DDP_DEAD) && ps->flags & PS_WIRED) { 189 KASSERT(toep->ddp_cached_count + toep->ddp_active_count < 190 nitems(toep->db), ("too many wired pagesets")); 191 TAILQ_INSERT_HEAD(&toep->ddp_cached_pagesets, ps, link); 192 toep->ddp_cached_count++; 193 } else 194 free_pageset(toep->td, ps); 195 } 196 197 static void 198 ddp_complete_one(struct kaiocb *job, int error) 199 { 200 long copied; 201 202 /* 203 * If this job had copied data out of the socket buffer before 204 * it was cancelled, report it as a short read rather than an 205 * error. 206 */ 207 copied = job->uaiocb._aiocb_private.status; 208 if (copied != 0 || error == 0) 209 aio_complete(job, copied, 0); 210 else 211 aio_complete(job, -1, error); 212 } 213 214 static void 215 free_ddp_buffer(struct tom_data *td, struct ddp_buffer *db) 216 { 217 218 if (db->job) { 219 /* 220 * XXX: If we are un-offloading the socket then we 221 * should requeue these on the socket somehow. If we 222 * got a FIN from the remote end, then this completes 223 * any remaining requests with an EOF read. 224 */ 225 if (!aio_clear_cancel_function(db->job)) 226 ddp_complete_one(db->job, 0); 227 } 228 229 if (db->ps) 230 free_pageset(td, db->ps); 231 } 232 233 void 234 ddp_init_toep(struct toepcb *toep) 235 { 236 237 TAILQ_INIT(&toep->ddp_aiojobq); 238 TASK_INIT(&toep->ddp_requeue_task, 0, aio_ddp_requeue_task, toep); 239 toep->ddp_active_id = -1; 240 mtx_init(&toep->ddp_lock, "t4 ddp", NULL, MTX_DEF); 241 } 242 243 void 244 ddp_uninit_toep(struct toepcb *toep) 245 { 246 247 mtx_destroy(&toep->ddp_lock); 248 } 249 250 void 251 release_ddp_resources(struct toepcb *toep) 252 { 253 struct pageset *ps; 254 int i; 255 256 DDP_LOCK(toep); 257 toep->flags |= DDP_DEAD; 258 for (i = 0; i < nitems(toep->db); i++) { 259 free_ddp_buffer(toep->td, &toep->db[i]); 260 } 261 while ((ps = TAILQ_FIRST(&toep->ddp_cached_pagesets)) != NULL) { 262 TAILQ_REMOVE(&toep->ddp_cached_pagesets, ps, link); 263 free_pageset(toep->td, ps); 264 } 265 ddp_complete_all(toep, 0); 266 DDP_UNLOCK(toep); 267 } 268 269 #ifdef INVARIANTS 270 void 271 ddp_assert_empty(struct toepcb *toep) 272 { 273 int i; 274 275 MPASS(!(toep->ddp_flags & DDP_TASK_ACTIVE)); 276 for (i = 0; i < nitems(toep->db); i++) { 277 MPASS(toep->db[i].job == NULL); 278 MPASS(toep->db[i].ps == NULL); 279 } 280 MPASS(TAILQ_EMPTY(&toep->ddp_cached_pagesets)); 281 MPASS(TAILQ_EMPTY(&toep->ddp_aiojobq)); 282 } 283 #endif 284 285 static void 286 complete_ddp_buffer(struct toepcb *toep, struct ddp_buffer *db, 287 unsigned int db_idx) 288 { 289 unsigned int db_flag; 290 291 toep->ddp_active_count--; 292 if (toep->ddp_active_id == db_idx) { 293 if (toep->ddp_active_count == 0) { 294 KASSERT(toep->db[db_idx ^ 1].job == NULL, 295 ("%s: active_count mismatch", __func__)); 296 toep->ddp_active_id = -1; 297 } else 298 toep->ddp_active_id ^= 1; 299 CTR2(KTR_CXGBE, "%s: ddp_active_id = %d", __func__, 300 toep->ddp_active_id); 301 } else { 302 KASSERT(toep->ddp_active_count != 0 && 303 toep->ddp_active_id != -1, 304 ("%s: active count mismatch", __func__)); 305 } 306 307 db->cancel_pending = 0; 308 db->job = NULL; 309 recycle_pageset(toep, db->ps); 310 db->ps = NULL; 311 312 db_flag = db_idx == 1 ? DDP_BUF1_ACTIVE : DDP_BUF0_ACTIVE; 313 KASSERT(toep->ddp_flags & db_flag, 314 ("%s: DDP buffer not active. toep %p, ddp_flags 0x%x", 315 __func__, toep, toep->ddp_flags)); 316 toep->ddp_flags &= ~db_flag; 317 } 318 319 /* XXX: handle_ddp_data code duplication */ 320 void 321 insert_ddp_data(struct toepcb *toep, uint32_t n) 322 { 323 struct inpcb *inp = toep->inp; 324 struct tcpcb *tp = intotcpcb(inp); 325 struct ddp_buffer *db; 326 struct kaiocb *job; 327 size_t placed; 328 long copied; 329 unsigned int db_flag, db_idx; 330 331 INP_WLOCK_ASSERT(inp); 332 DDP_ASSERT_LOCKED(toep); 333 334 tp->rcv_nxt += n; 335 #ifndef USE_DDP_RX_FLOW_CONTROL 336 KASSERT(tp->rcv_wnd >= n, ("%s: negative window size", __func__)); 337 tp->rcv_wnd -= n; 338 #endif 339 #ifndef USE_DDP_RX_FLOW_CONTROL 340 toep->rx_credits += n; 341 #endif 342 CTR2(KTR_CXGBE, "%s: placed %u bytes before falling out of DDP", 343 __func__, n); 344 while (toep->ddp_active_count > 0) { 345 MPASS(toep->ddp_active_id != -1); 346 db_idx = toep->ddp_active_id; 347 db_flag = db_idx == 1 ? DDP_BUF1_ACTIVE : DDP_BUF0_ACTIVE; 348 MPASS((toep->ddp_flags & db_flag) != 0); 349 db = &toep->db[db_idx]; 350 job = db->job; 351 copied = job->uaiocb._aiocb_private.status; 352 placed = n; 353 if (placed > job->uaiocb.aio_nbytes - copied) 354 placed = job->uaiocb.aio_nbytes - copied; 355 if (!aio_clear_cancel_function(job)) { 356 /* 357 * Update the copied length for when 358 * t4_aio_cancel_active() completes this 359 * request. 360 */ 361 job->uaiocb._aiocb_private.status += placed; 362 } else if (copied + placed != 0) { 363 CTR4(KTR_CXGBE, 364 "%s: completing %p (copied %ld, placed %lu)", 365 __func__, job, copied, placed); 366 /* XXX: This always completes if there is some data. */ 367 aio_complete(job, copied + placed, 0); 368 } else if (aio_set_cancel_function(job, t4_aio_cancel_queued)) { 369 TAILQ_INSERT_HEAD(&toep->ddp_aiojobq, job, list); 370 toep->ddp_waiting_count++; 371 } else 372 aio_cancel(job); 373 n -= placed; 374 complete_ddp_buffer(toep, db, db_idx); 375 } 376 377 MPASS(n == 0); 378 } 379 380 /* SET_TCB_FIELD sent as a ULP command looks like this */ 381 #define LEN__SET_TCB_FIELD_ULP (sizeof(struct ulp_txpkt) + \ 382 sizeof(struct ulptx_idata) + sizeof(struct cpl_set_tcb_field_core)) 383 384 /* RX_DATA_ACK sent as a ULP command looks like this */ 385 #define LEN__RX_DATA_ACK_ULP (sizeof(struct ulp_txpkt) + \ 386 sizeof(struct ulptx_idata) + sizeof(struct cpl_rx_data_ack_core)) 387 388 static inline void * 389 mk_set_tcb_field_ulp(struct ulp_txpkt *ulpmc, struct toepcb *toep, 390 uint64_t word, uint64_t mask, uint64_t val) 391 { 392 struct ulptx_idata *ulpsc; 393 struct cpl_set_tcb_field_core *req; 394 395 ulpmc->cmd_dest = htonl(V_ULPTX_CMD(ULP_TX_PKT) | V_ULP_TXPKT_DEST(0)); 396 ulpmc->len = htobe32(howmany(LEN__SET_TCB_FIELD_ULP, 16)); 397 398 ulpsc = (struct ulptx_idata *)(ulpmc + 1); 399 ulpsc->cmd_more = htobe32(V_ULPTX_CMD(ULP_TX_SC_IMM)); 400 ulpsc->len = htobe32(sizeof(*req)); 401 402 req = (struct cpl_set_tcb_field_core *)(ulpsc + 1); 403 OPCODE_TID(req) = htobe32(MK_OPCODE_TID(CPL_SET_TCB_FIELD, toep->tid)); 404 req->reply_ctrl = htobe16(V_NO_REPLY(1) | 405 V_QUEUENO(toep->ofld_rxq->iq.abs_id)); 406 req->word_cookie = htobe16(V_WORD(word) | V_COOKIE(0)); 407 req->mask = htobe64(mask); 408 req->val = htobe64(val); 409 410 ulpsc = (struct ulptx_idata *)(req + 1); 411 if (LEN__SET_TCB_FIELD_ULP % 16) { 412 ulpsc->cmd_more = htobe32(V_ULPTX_CMD(ULP_TX_SC_NOOP)); 413 ulpsc->len = htobe32(0); 414 return (ulpsc + 1); 415 } 416 return (ulpsc); 417 } 418 419 static inline void * 420 mk_rx_data_ack_ulp(struct ulp_txpkt *ulpmc, struct toepcb *toep) 421 { 422 struct ulptx_idata *ulpsc; 423 struct cpl_rx_data_ack_core *req; 424 425 ulpmc->cmd_dest = htonl(V_ULPTX_CMD(ULP_TX_PKT) | V_ULP_TXPKT_DEST(0)); 426 ulpmc->len = htobe32(howmany(LEN__RX_DATA_ACK_ULP, 16)); 427 428 ulpsc = (struct ulptx_idata *)(ulpmc + 1); 429 ulpsc->cmd_more = htobe32(V_ULPTX_CMD(ULP_TX_SC_IMM)); 430 ulpsc->len = htobe32(sizeof(*req)); 431 432 req = (struct cpl_rx_data_ack_core *)(ulpsc + 1); 433 OPCODE_TID(req) = htobe32(MK_OPCODE_TID(CPL_RX_DATA_ACK, toep->tid)); 434 req->credit_dack = htobe32(F_RX_MODULATE_RX); 435 436 ulpsc = (struct ulptx_idata *)(req + 1); 437 if (LEN__RX_DATA_ACK_ULP % 16) { 438 ulpsc->cmd_more = htobe32(V_ULPTX_CMD(ULP_TX_SC_NOOP)); 439 ulpsc->len = htobe32(0); 440 return (ulpsc + 1); 441 } 442 return (ulpsc); 443 } 444 445 static struct wrqe * 446 mk_update_tcb_for_ddp(struct adapter *sc, struct toepcb *toep, int db_idx, 447 struct pageset *ps, int offset, uint64_t ddp_flags, uint64_t ddp_flags_mask) 448 { 449 struct wrqe *wr; 450 struct work_request_hdr *wrh; 451 struct ulp_txpkt *ulpmc; 452 int len; 453 454 KASSERT(db_idx == 0 || db_idx == 1, 455 ("%s: bad DDP buffer index %d", __func__, db_idx)); 456 457 /* 458 * We'll send a compound work request that has 3 SET_TCB_FIELDs and an 459 * RX_DATA_ACK (with RX_MODULATE to speed up delivery). 460 * 461 * The work request header is 16B and always ends at a 16B boundary. 462 * The ULPTX master commands that follow must all end at 16B boundaries 463 * too so we round up the size to 16. 464 */ 465 len = sizeof(*wrh) + 3 * roundup2(LEN__SET_TCB_FIELD_ULP, 16) + 466 roundup2(LEN__RX_DATA_ACK_ULP, 16); 467 468 wr = alloc_wrqe(len, toep->ctrlq); 469 if (wr == NULL) 470 return (NULL); 471 wrh = wrtod(wr); 472 INIT_ULPTX_WRH(wrh, len, 1, 0); /* atomic */ 473 ulpmc = (struct ulp_txpkt *)(wrh + 1); 474 475 /* Write the buffer's tag */ 476 ulpmc = mk_set_tcb_field_ulp(ulpmc, toep, 477 W_TCB_RX_DDP_BUF0_TAG + db_idx, 478 V_TCB_RX_DDP_BUF0_TAG(M_TCB_RX_DDP_BUF0_TAG), 479 V_TCB_RX_DDP_BUF0_TAG(ps->tag)); 480 481 /* Update the current offset in the DDP buffer and its total length */ 482 if (db_idx == 0) 483 ulpmc = mk_set_tcb_field_ulp(ulpmc, toep, 484 W_TCB_RX_DDP_BUF0_OFFSET, 485 V_TCB_RX_DDP_BUF0_OFFSET(M_TCB_RX_DDP_BUF0_OFFSET) | 486 V_TCB_RX_DDP_BUF0_LEN(M_TCB_RX_DDP_BUF0_LEN), 487 V_TCB_RX_DDP_BUF0_OFFSET(offset) | 488 V_TCB_RX_DDP_BUF0_LEN(ps->len)); 489 else 490 ulpmc = mk_set_tcb_field_ulp(ulpmc, toep, 491 W_TCB_RX_DDP_BUF1_OFFSET, 492 V_TCB_RX_DDP_BUF1_OFFSET(M_TCB_RX_DDP_BUF1_OFFSET) | 493 V_TCB_RX_DDP_BUF1_LEN((u64)M_TCB_RX_DDP_BUF1_LEN << 32), 494 V_TCB_RX_DDP_BUF1_OFFSET(offset) | 495 V_TCB_RX_DDP_BUF1_LEN((u64)ps->len << 32)); 496 497 /* Update DDP flags */ 498 ulpmc = mk_set_tcb_field_ulp(ulpmc, toep, W_TCB_RX_DDP_FLAGS, 499 ddp_flags_mask, ddp_flags); 500 501 /* Gratuitous RX_DATA_ACK with RX_MODULATE set to speed up delivery. */ 502 ulpmc = mk_rx_data_ack_ulp(ulpmc, toep); 503 504 return (wr); 505 } 506 507 static int 508 handle_ddp_data(struct toepcb *toep, __be32 ddp_report, __be32 rcv_nxt, int len) 509 { 510 uint32_t report = be32toh(ddp_report); 511 unsigned int db_idx; 512 struct inpcb *inp = toep->inp; 513 struct ddp_buffer *db; 514 struct tcpcb *tp; 515 struct socket *so; 516 struct sockbuf *sb; 517 struct kaiocb *job; 518 long copied; 519 520 db_idx = report & F_DDP_BUF_IDX ? 1 : 0; 521 522 if (__predict_false(!(report & F_DDP_INV))) 523 CXGBE_UNIMPLEMENTED("DDP buffer still valid"); 524 525 INP_WLOCK(inp); 526 so = inp_inpcbtosocket(inp); 527 sb = &so->so_rcv; 528 DDP_LOCK(toep); 529 530 KASSERT(toep->ddp_active_id == db_idx, 531 ("completed DDP buffer (%d) != active_id (%d) for tid %d", db_idx, 532 toep->ddp_active_id, toep->tid)); 533 db = &toep->db[db_idx]; 534 job = db->job; 535 536 if (__predict_false(inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT))) { 537 /* 538 * This can happen due to an administrative tcpdrop(8). 539 * Just fail the request with ECONNRESET. 540 */ 541 CTR5(KTR_CXGBE, "%s: tid %u, seq 0x%x, len %d, inp_flags 0x%x", 542 __func__, toep->tid, be32toh(rcv_nxt), len, inp->inp_flags); 543 if (aio_clear_cancel_function(job)) 544 ddp_complete_one(job, ECONNRESET); 545 goto completed; 546 } 547 548 tp = intotcpcb(inp); 549 550 /* 551 * For RX_DDP_COMPLETE, len will be zero and rcv_nxt is the 552 * sequence number of the next byte to receive. The length of 553 * the data received for this message must be computed by 554 * comparing the new and old values of rcv_nxt. 555 * 556 * For RX_DATA_DDP, len might be non-zero, but it is only the 557 * length of the most recent DMA. It does not include the 558 * total length of the data received since the previous update 559 * for this DDP buffer. rcv_nxt is the sequence number of the 560 * first received byte from the most recent DMA. 561 */ 562 len += be32toh(rcv_nxt) - tp->rcv_nxt; 563 tp->rcv_nxt += len; 564 tp->t_rcvtime = ticks; 565 #ifndef USE_DDP_RX_FLOW_CONTROL 566 KASSERT(tp->rcv_wnd >= len, ("%s: negative window size", __func__)); 567 tp->rcv_wnd -= len; 568 #endif 569 #ifdef VERBOSE_TRACES 570 CTR4(KTR_CXGBE, "%s: DDP[%d] placed %d bytes (%#x)", __func__, db_idx, 571 len, report); 572 #endif 573 574 /* receive buffer autosize */ 575 CURVNET_SET(so->so_vnet); 576 SOCKBUF_LOCK(sb); 577 if (sb->sb_flags & SB_AUTOSIZE && 578 V_tcp_do_autorcvbuf && 579 sb->sb_hiwat < V_tcp_autorcvbuf_max && 580 len > (sbspace(sb) / 8 * 7)) { 581 unsigned int hiwat = sb->sb_hiwat; 582 unsigned int newsize = min(hiwat + V_tcp_autorcvbuf_inc, 583 V_tcp_autorcvbuf_max); 584 585 if (!sbreserve_locked(sb, newsize, so, NULL)) 586 sb->sb_flags &= ~SB_AUTOSIZE; 587 else 588 toep->rx_credits += newsize - hiwat; 589 } 590 SOCKBUF_UNLOCK(sb); 591 CURVNET_RESTORE(); 592 593 #ifndef USE_DDP_RX_FLOW_CONTROL 594 toep->rx_credits += len; 595 #endif 596 597 if (db->cancel_pending) { 598 /* 599 * Update the job's length but defer completion to the 600 * TCB_RPL callback. 601 */ 602 job->uaiocb._aiocb_private.status += len; 603 goto out; 604 } else if (!aio_clear_cancel_function(job)) { 605 /* 606 * Update the copied length for when 607 * t4_aio_cancel_active() completes this request. 608 */ 609 job->uaiocb._aiocb_private.status += len; 610 } else { 611 copied = job->uaiocb._aiocb_private.status; 612 #ifdef VERBOSE_TRACES 613 CTR4(KTR_CXGBE, "%s: completing %p (copied %ld, placed %d)", 614 __func__, job, copied, len); 615 #endif 616 aio_complete(job, copied + len, 0); 617 t4_rcvd(&toep->td->tod, tp); 618 } 619 620 completed: 621 complete_ddp_buffer(toep, db, db_idx); 622 if (toep->ddp_waiting_count > 0) 623 ddp_queue_toep(toep); 624 out: 625 DDP_UNLOCK(toep); 626 INP_WUNLOCK(inp); 627 628 return (0); 629 } 630 631 void 632 handle_ddp_indicate(struct toepcb *toep) 633 { 634 635 DDP_ASSERT_LOCKED(toep); 636 MPASS(toep->ddp_active_count == 0); 637 MPASS((toep->ddp_flags & (DDP_BUF0_ACTIVE | DDP_BUF1_ACTIVE)) == 0); 638 if (toep->ddp_waiting_count == 0) { 639 /* 640 * The pending requests that triggered the request for an 641 * an indicate were cancelled. Those cancels should have 642 * already disabled DDP. Just ignore this as the data is 643 * going into the socket buffer anyway. 644 */ 645 return; 646 } 647 CTR3(KTR_CXGBE, "%s: tid %d indicated (%d waiting)", __func__, 648 toep->tid, toep->ddp_waiting_count); 649 ddp_queue_toep(toep); 650 } 651 652 enum { 653 DDP_BUF0_INVALIDATED = 0x2, 654 DDP_BUF1_INVALIDATED 655 }; 656 657 void 658 handle_ddp_tcb_rpl(struct toepcb *toep, const struct cpl_set_tcb_rpl *cpl) 659 { 660 unsigned int db_idx; 661 struct inpcb *inp = toep->inp; 662 struct ddp_buffer *db; 663 struct kaiocb *job; 664 long copied; 665 666 if (cpl->status != CPL_ERR_NONE) 667 panic("XXX: tcp_rpl failed: %d", cpl->status); 668 669 switch (cpl->cookie) { 670 case V_WORD(W_TCB_RX_DDP_FLAGS) | V_COOKIE(DDP_BUF0_INVALIDATED): 671 case V_WORD(W_TCB_RX_DDP_FLAGS) | V_COOKIE(DDP_BUF1_INVALIDATED): 672 /* 673 * XXX: This duplicates a lot of code with handle_ddp_data(). 674 */ 675 db_idx = G_COOKIE(cpl->cookie) - DDP_BUF0_INVALIDATED; 676 INP_WLOCK(inp); 677 DDP_LOCK(toep); 678 db = &toep->db[db_idx]; 679 680 /* 681 * handle_ddp_data() should leave the job around until 682 * this callback runs once a cancel is pending. 683 */ 684 MPASS(db != NULL); 685 MPASS(db->job != NULL); 686 MPASS(db->cancel_pending); 687 688 /* 689 * XXX: It's not clear what happens if there is data 690 * placed when the buffer is invalidated. I suspect we 691 * need to read the TCB to see how much data was placed. 692 * 693 * For now this just pretends like nothing was placed. 694 * 695 * XXX: Note that if we did check the PCB we would need to 696 * also take care of updating the tp, etc. 697 */ 698 job = db->job; 699 copied = job->uaiocb._aiocb_private.status; 700 if (copied == 0) { 701 CTR2(KTR_CXGBE, "%s: cancelling %p", __func__, job); 702 aio_cancel(job); 703 } else { 704 CTR3(KTR_CXGBE, "%s: completing %p (copied %ld)", 705 __func__, job, copied); 706 aio_complete(job, copied, 0); 707 t4_rcvd(&toep->td->tod, intotcpcb(inp)); 708 } 709 710 complete_ddp_buffer(toep, db, db_idx); 711 if (toep->ddp_waiting_count > 0) 712 ddp_queue_toep(toep); 713 DDP_UNLOCK(toep); 714 INP_WUNLOCK(inp); 715 break; 716 default: 717 panic("XXX: unknown tcb_rpl offset %#x, cookie %#x", 718 G_WORD(cpl->cookie), G_COOKIE(cpl->cookie)); 719 } 720 } 721 722 void 723 handle_ddp_close(struct toepcb *toep, struct tcpcb *tp, __be32 rcv_nxt) 724 { 725 struct ddp_buffer *db; 726 struct kaiocb *job; 727 long copied; 728 unsigned int db_flag, db_idx; 729 int len, placed; 730 731 INP_WLOCK_ASSERT(toep->inp); 732 DDP_ASSERT_LOCKED(toep); 733 len = be32toh(rcv_nxt) - tp->rcv_nxt; 734 735 tp->rcv_nxt += len; 736 #ifndef USE_DDP_RX_FLOW_CONTROL 737 toep->rx_credits += len; 738 #endif 739 740 while (toep->ddp_active_count > 0) { 741 MPASS(toep->ddp_active_id != -1); 742 db_idx = toep->ddp_active_id; 743 db_flag = db_idx == 1 ? DDP_BUF1_ACTIVE : DDP_BUF0_ACTIVE; 744 MPASS((toep->ddp_flags & db_flag) != 0); 745 db = &toep->db[db_idx]; 746 job = db->job; 747 copied = job->uaiocb._aiocb_private.status; 748 placed = len; 749 if (placed > job->uaiocb.aio_nbytes - copied) 750 placed = job->uaiocb.aio_nbytes - copied; 751 if (!aio_clear_cancel_function(job)) { 752 /* 753 * Update the copied length for when 754 * t4_aio_cancel_active() completes this 755 * request. 756 */ 757 job->uaiocb._aiocb_private.status += placed; 758 } else { 759 CTR4(KTR_CXGBE, "%s: tid %d completed buf %d len %d", 760 __func__, toep->tid, db_idx, placed); 761 aio_complete(job, copied + placed, 0); 762 } 763 len -= placed; 764 complete_ddp_buffer(toep, db, db_idx); 765 } 766 767 MPASS(len == 0); 768 ddp_complete_all(toep, 0); 769 } 770 771 #define DDP_ERR (F_DDP_PPOD_MISMATCH | F_DDP_LLIMIT_ERR | F_DDP_ULIMIT_ERR |\ 772 F_DDP_PPOD_PARITY_ERR | F_DDP_PADDING_ERR | F_DDP_OFFSET_ERR |\ 773 F_DDP_INVALID_TAG | F_DDP_COLOR_ERR | F_DDP_TID_MISMATCH |\ 774 F_DDP_INVALID_PPOD | F_DDP_HDRCRC_ERR | F_DDP_DATACRC_ERR) 775 776 static int 777 do_rx_data_ddp(struct sge_iq *iq, const struct rss_header *rss, struct mbuf *m) 778 { 779 struct adapter *sc = iq->adapter; 780 const struct cpl_rx_data_ddp *cpl = (const void *)(rss + 1); 781 unsigned int tid = GET_TID(cpl); 782 uint32_t vld; 783 struct toepcb *toep = lookup_tid(sc, tid); 784 785 KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__)); 786 KASSERT(toep->tid == tid, ("%s: toep tid/atid mismatch", __func__)); 787 KASSERT(!(toep->flags & TPF_SYNQE), 788 ("%s: toep %p claims to be a synq entry", __func__, toep)); 789 790 vld = be32toh(cpl->ddpvld); 791 if (__predict_false(vld & DDP_ERR)) { 792 panic("%s: DDP error 0x%x (tid %d, toep %p)", 793 __func__, vld, tid, toep); 794 } 795 796 if (toep->ulp_mode == ULP_MODE_ISCSI) { 797 sc->cpl_handler[CPL_RX_ISCSI_DDP](iq, rss, m); 798 return (0); 799 } 800 801 handle_ddp_data(toep, cpl->u.ddp_report, cpl->seq, be16toh(cpl->len)); 802 803 return (0); 804 } 805 806 static int 807 do_rx_ddp_complete(struct sge_iq *iq, const struct rss_header *rss, 808 struct mbuf *m) 809 { 810 struct adapter *sc = iq->adapter; 811 const struct cpl_rx_ddp_complete *cpl = (const void *)(rss + 1); 812 unsigned int tid = GET_TID(cpl); 813 struct toepcb *toep = lookup_tid(sc, tid); 814 815 KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__)); 816 KASSERT(toep->tid == tid, ("%s: toep tid/atid mismatch", __func__)); 817 KASSERT(!(toep->flags & TPF_SYNQE), 818 ("%s: toep %p claims to be a synq entry", __func__, toep)); 819 820 handle_ddp_data(toep, cpl->ddp_report, cpl->rcv_nxt, 0); 821 822 return (0); 823 } 824 825 static void 826 enable_ddp(struct adapter *sc, struct toepcb *toep) 827 { 828 829 KASSERT((toep->ddp_flags & (DDP_ON | DDP_OK | DDP_SC_REQ)) == DDP_OK, 830 ("%s: toep %p has bad ddp_flags 0x%x", 831 __func__, toep, toep->ddp_flags)); 832 833 CTR3(KTR_CXGBE, "%s: tid %u (time %u)", 834 __func__, toep->tid, time_uptime); 835 836 DDP_ASSERT_LOCKED(toep); 837 toep->ddp_flags |= DDP_SC_REQ; 838 t4_set_tcb_field(sc, toep, 1, W_TCB_RX_DDP_FLAGS, 839 V_TF_DDP_OFF(1) | V_TF_DDP_INDICATE_OUT(1) | 840 V_TF_DDP_BUF0_INDICATE(1) | V_TF_DDP_BUF1_INDICATE(1) | 841 V_TF_DDP_BUF0_VALID(1) | V_TF_DDP_BUF1_VALID(1), 842 V_TF_DDP_BUF0_INDICATE(1) | V_TF_DDP_BUF1_INDICATE(1)); 843 t4_set_tcb_field(sc, toep, 1, W_TCB_T_FLAGS, 844 V_TF_RCV_COALESCE_ENABLE(1), 0); 845 } 846 847 static int 848 calculate_hcf(int n1, int n2) 849 { 850 int a, b, t; 851 852 if (n1 <= n2) { 853 a = n1; 854 b = n2; 855 } else { 856 a = n2; 857 b = n1; 858 } 859 860 while (a != 0) { 861 t = a; 862 a = b % a; 863 b = t; 864 } 865 866 return (b); 867 } 868 869 static int 870 alloc_page_pods(struct tom_data *td, struct pageset *ps) 871 { 872 int i, hcf, seglen, idx, ppod, nppods; 873 u_int ppod_addr; 874 875 KASSERT(ps->nppods == 0, ("%s: page pods already allocated", __func__)); 876 877 /* 878 * The DDP page size is unrelated to the VM page size. We combine 879 * contiguous physical pages into larger segments to get the best DDP 880 * page size possible. This is the largest of the four sizes in 881 * A_ULP_RX_TDDP_PSZ that evenly divides the HCF of the segment sizes in 882 * the page list. 883 */ 884 hcf = 0; 885 for (i = 0; i < ps->npages; i++) { 886 seglen = PAGE_SIZE; 887 while (i < ps->npages - 1 && 888 ps->pages[i]->phys_addr + PAGE_SIZE == 889 ps->pages[i + 1]->phys_addr) { 890 seglen += PAGE_SIZE; 891 i++; 892 } 893 894 hcf = calculate_hcf(hcf, seglen); 895 if (hcf < t4_ddp_pgsz[1]) { 896 idx = 0; 897 goto have_pgsz; /* give up, short circuit */ 898 } 899 } 900 901 if (hcf % t4_ddp_pgsz[0] != 0) { 902 /* hmmm. This could only happen when PAGE_SIZE < 4K */ 903 KASSERT(PAGE_SIZE < 4096, 904 ("%s: PAGE_SIZE %d, hcf %d", __func__, PAGE_SIZE, hcf)); 905 CTR3(KTR_CXGBE, "%s: PAGE_SIZE %d, hcf %d", 906 __func__, PAGE_SIZE, hcf); 907 return (0); 908 } 909 910 for (idx = nitems(t4_ddp_pgsz) - 1; idx > 0; idx--) { 911 if (hcf % t4_ddp_pgsz[idx] == 0) 912 break; 913 } 914 have_pgsz: 915 MPASS(idx <= M_PPOD_PGSZ); 916 917 nppods = pages_to_nppods(ps->npages, t4_ddp_pgsz[idx]); 918 if (alloc_ppods(td, nppods, &ppod_addr) != 0) { 919 CTR4(KTR_CXGBE, "%s: no pods, nppods %d, npages %d, pgsz %d", 920 __func__, nppods, ps->npages, t4_ddp_pgsz[idx]); 921 return (0); 922 } 923 924 ppod = (ppod_addr - td->ppod_start) / PPOD_SIZE; 925 ps->tag = V_PPOD_PGSZ(idx) | V_PPOD_TAG(ppod); 926 ps->ppod_addr = ppod_addr; 927 ps->nppods = nppods; 928 929 CTR5(KTR_CXGBE, "New page pods. " 930 "ps %p, ddp_pgsz %d, ppod 0x%x, npages %d, nppods %d", 931 ps, t4_ddp_pgsz[idx], ppod, ps->npages, ps->nppods); 932 933 return (1); 934 } 935 936 #define NUM_ULP_TX_SC_IMM_PPODS (256 / PPOD_SIZE) 937 938 static int 939 write_page_pods(struct adapter *sc, struct toepcb *toep, struct pageset *ps) 940 { 941 struct wrqe *wr; 942 struct ulp_mem_io *ulpmc; 943 struct ulptx_idata *ulpsc; 944 struct pagepod *ppod; 945 int i, j, k, n, chunk, len, ddp_pgsz, idx; 946 u_int ppod_addr; 947 uint32_t cmd; 948 949 KASSERT(!(ps->flags & PS_PPODS_WRITTEN), 950 ("%s: page pods already written", __func__)); 951 952 cmd = htobe32(V_ULPTX_CMD(ULP_TX_MEM_WRITE)); 953 if (is_t4(sc)) 954 cmd |= htobe32(F_ULP_MEMIO_ORDER); 955 else 956 cmd |= htobe32(F_T5_ULP_MEMIO_IMM); 957 ddp_pgsz = t4_ddp_pgsz[G_PPOD_PGSZ(ps->tag)]; 958 ppod_addr = ps->ppod_addr; 959 for (i = 0; i < ps->nppods; ppod_addr += chunk) { 960 961 /* How many page pods are we writing in this cycle */ 962 n = min(ps->nppods - i, NUM_ULP_TX_SC_IMM_PPODS); 963 chunk = PPOD_SZ(n); 964 len = roundup2(sizeof(*ulpmc) + sizeof(*ulpsc) + chunk, 16); 965 966 wr = alloc_wrqe(len, toep->ctrlq); 967 if (wr == NULL) 968 return (ENOMEM); /* ok to just bail out */ 969 ulpmc = wrtod(wr); 970 971 INIT_ULPTX_WR(ulpmc, len, 0, 0); 972 ulpmc->cmd = cmd; 973 ulpmc->dlen = htobe32(V_ULP_MEMIO_DATA_LEN(chunk / 32)); 974 ulpmc->len16 = htobe32(howmany(len - sizeof(ulpmc->wr), 16)); 975 ulpmc->lock_addr = htobe32(V_ULP_MEMIO_ADDR(ppod_addr >> 5)); 976 977 ulpsc = (struct ulptx_idata *)(ulpmc + 1); 978 ulpsc->cmd_more = htobe32(V_ULPTX_CMD(ULP_TX_SC_IMM)); 979 ulpsc->len = htobe32(chunk); 980 981 ppod = (struct pagepod *)(ulpsc + 1); 982 for (j = 0; j < n; i++, j++, ppod++) { 983 ppod->vld_tid_pgsz_tag_color = htobe64(F_PPOD_VALID | 984 V_PPOD_TID(toep->tid) | ps->tag); 985 ppod->len_offset = htobe64(V_PPOD_LEN(ps->len) | 986 V_PPOD_OFST(ps->offset)); 987 ppod->rsvd = 0; 988 idx = i * PPOD_PAGES * (ddp_pgsz / PAGE_SIZE); 989 for (k = 0; k < nitems(ppod->addr); k++) { 990 if (idx < ps->npages) { 991 ppod->addr[k] = 992 htobe64(ps->pages[idx]->phys_addr); 993 idx += ddp_pgsz / PAGE_SIZE; 994 } else 995 ppod->addr[k] = 0; 996 #if 0 997 CTR5(KTR_CXGBE, 998 "%s: tid %d ppod[%d]->addr[%d] = %p", 999 __func__, toep->tid, i, k, 1000 htobe64(ppod->addr[k])); 1001 #endif 1002 } 1003 1004 } 1005 1006 t4_wrq_tx(sc, wr); 1007 } 1008 ps->flags |= PS_PPODS_WRITTEN; 1009 1010 return (0); 1011 } 1012 1013 static void 1014 wire_pageset(struct pageset *ps) 1015 { 1016 vm_page_t p; 1017 int i; 1018 1019 KASSERT(!(ps->flags & PS_WIRED), ("pageset already wired")); 1020 1021 for (i = 0; i < ps->npages; i++) { 1022 p = ps->pages[i]; 1023 vm_page_lock(p); 1024 vm_page_wire(p); 1025 vm_page_unhold(p); 1026 vm_page_unlock(p); 1027 } 1028 ps->flags |= PS_WIRED; 1029 } 1030 1031 /* 1032 * Prepare a pageset for DDP. This wires the pageset and sets up page 1033 * pods. 1034 */ 1035 static int 1036 prep_pageset(struct adapter *sc, struct toepcb *toep, struct pageset *ps) 1037 { 1038 struct tom_data *td = sc->tom_softc; 1039 1040 if (!(ps->flags & PS_WIRED)) 1041 wire_pageset(ps); 1042 if (ps->nppods == 0 && !alloc_page_pods(td, ps)) { 1043 return (0); 1044 } 1045 if (!(ps->flags & PS_PPODS_WRITTEN) && 1046 write_page_pods(sc, toep, ps) != 0) { 1047 return (0); 1048 } 1049 1050 return (1); 1051 } 1052 1053 void 1054 t4_init_ddp(struct adapter *sc, struct tom_data *td) 1055 { 1056 1057 td->ppod_start = sc->vres.ddp.start; 1058 td->ppod_arena = vmem_create("DDP page pods", sc->vres.ddp.start, 1059 sc->vres.ddp.size, 1, 32, M_FIRSTFIT | M_NOWAIT); 1060 1061 t4_register_cpl_handler(sc, CPL_RX_DATA_DDP, do_rx_data_ddp); 1062 t4_register_cpl_handler(sc, CPL_RX_DDP_COMPLETE, do_rx_ddp_complete); 1063 } 1064 1065 void 1066 t4_uninit_ddp(struct adapter *sc __unused, struct tom_data *td) 1067 { 1068 1069 if (td->ppod_arena != NULL) { 1070 vmem_destroy(td->ppod_arena); 1071 td->ppod_arena = NULL; 1072 } 1073 } 1074 1075 static int 1076 pscmp(struct pageset *ps, struct vmspace *vm, vm_offset_t start, int npages, 1077 int pgoff, int len) 1078 { 1079 1080 if (ps->npages != npages || ps->offset != pgoff || ps->len != len) 1081 return (1); 1082 1083 return (ps->vm != vm || ps->vm_timestamp != vm->vm_map.timestamp); 1084 } 1085 1086 static int 1087 hold_aio(struct toepcb *toep, struct kaiocb *job, struct pageset **pps) 1088 { 1089 struct vmspace *vm; 1090 vm_map_t map; 1091 vm_offset_t start, end, pgoff; 1092 struct pageset *ps; 1093 int n; 1094 1095 DDP_ASSERT_LOCKED(toep); 1096 1097 /* 1098 * The AIO subsystem will cancel and drain all requests before 1099 * permitting a process to exit or exec, so p_vmspace should 1100 * be stable here. 1101 */ 1102 vm = job->userproc->p_vmspace; 1103 map = &vm->vm_map; 1104 start = (uintptr_t)job->uaiocb.aio_buf; 1105 pgoff = start & PAGE_MASK; 1106 end = round_page(start + job->uaiocb.aio_nbytes); 1107 start = trunc_page(start); 1108 1109 if (end - start > MAX_DDP_BUFFER_SIZE) { 1110 /* 1111 * Truncate the request to a short read. 1112 * Alternatively, we could DDP in chunks to the larger 1113 * buffer, but that would be quite a bit more work. 1114 * 1115 * When truncating, round the request down to avoid 1116 * crossing a cache line on the final transaction. 1117 */ 1118 end = rounddown2(start + MAX_DDP_BUFFER_SIZE, CACHE_LINE_SIZE); 1119 #ifdef VERBOSE_TRACES 1120 CTR4(KTR_CXGBE, "%s: tid %d, truncating size from %lu to %lu", 1121 __func__, toep->tid, (unsigned long)job->uaiocb.aio_nbytes, 1122 (unsigned long)(end - (start + pgoff))); 1123 job->uaiocb.aio_nbytes = end - (start + pgoff); 1124 #endif 1125 end = round_page(end); 1126 } 1127 1128 n = atop(end - start); 1129 1130 /* 1131 * Try to reuse a cached pageset. 1132 */ 1133 TAILQ_FOREACH(ps, &toep->ddp_cached_pagesets, link) { 1134 if (pscmp(ps, vm, start, n, pgoff, 1135 job->uaiocb.aio_nbytes) == 0) { 1136 TAILQ_REMOVE(&toep->ddp_cached_pagesets, ps, link); 1137 toep->ddp_cached_count--; 1138 *pps = ps; 1139 return (0); 1140 } 1141 } 1142 1143 /* 1144 * If there are too many cached pagesets to create a new one, 1145 * free a pageset before creating a new one. 1146 */ 1147 KASSERT(toep->ddp_active_count + toep->ddp_cached_count <= 1148 nitems(toep->db), ("%s: too many wired pagesets", __func__)); 1149 if (toep->ddp_active_count + toep->ddp_cached_count == 1150 nitems(toep->db)) { 1151 KASSERT(toep->ddp_cached_count > 0, 1152 ("no cached pageset to free")); 1153 ps = TAILQ_LAST(&toep->ddp_cached_pagesets, pagesetq); 1154 TAILQ_REMOVE(&toep->ddp_cached_pagesets, ps, link); 1155 toep->ddp_cached_count--; 1156 free_pageset(toep->td, ps); 1157 } 1158 DDP_UNLOCK(toep); 1159 1160 /* Create a new pageset. */ 1161 ps = malloc(sizeof(*ps) + n * sizeof(vm_page_t), M_CXGBE, M_WAITOK | 1162 M_ZERO); 1163 ps->pages = (vm_page_t *)(ps + 1); 1164 ps->vm_timestamp = map->timestamp; 1165 ps->npages = vm_fault_quick_hold_pages(map, start, end - start, 1166 VM_PROT_WRITE, ps->pages, n); 1167 1168 DDP_LOCK(toep); 1169 if (ps->npages < 0) { 1170 free(ps, M_CXGBE); 1171 return (EFAULT); 1172 } 1173 1174 KASSERT(ps->npages == n, ("hold_aio: page count mismatch: %d vs %d", 1175 ps->npages, n)); 1176 1177 ps->offset = pgoff; 1178 ps->len = job->uaiocb.aio_nbytes; 1179 atomic_add_int(&vm->vm_refcnt, 1); 1180 ps->vm = vm; 1181 1182 CTR5(KTR_CXGBE, "%s: tid %d, new pageset %p for job %p, npages %d", 1183 __func__, toep->tid, ps, job, ps->npages); 1184 *pps = ps; 1185 return (0); 1186 } 1187 1188 static void 1189 ddp_complete_all(struct toepcb *toep, int error) 1190 { 1191 struct kaiocb *job; 1192 1193 DDP_ASSERT_LOCKED(toep); 1194 while (!TAILQ_EMPTY(&toep->ddp_aiojobq)) { 1195 job = TAILQ_FIRST(&toep->ddp_aiojobq); 1196 TAILQ_REMOVE(&toep->ddp_aiojobq, job, list); 1197 toep->ddp_waiting_count--; 1198 if (aio_clear_cancel_function(job)) 1199 ddp_complete_one(job, error); 1200 } 1201 } 1202 1203 static void 1204 aio_ddp_cancel_one(struct kaiocb *job) 1205 { 1206 long copied; 1207 1208 /* 1209 * If this job had copied data out of the socket buffer before 1210 * it was cancelled, report it as a short read rather than an 1211 * error. 1212 */ 1213 copied = job->uaiocb._aiocb_private.status; 1214 if (copied != 0) 1215 aio_complete(job, copied, 0); 1216 else 1217 aio_cancel(job); 1218 } 1219 1220 /* 1221 * Called when the main loop wants to requeue a job to retry it later. 1222 * Deals with the race of the job being cancelled while it was being 1223 * examined. 1224 */ 1225 static void 1226 aio_ddp_requeue_one(struct toepcb *toep, struct kaiocb *job) 1227 { 1228 1229 DDP_ASSERT_LOCKED(toep); 1230 if (!(toep->ddp_flags & DDP_DEAD) && 1231 aio_set_cancel_function(job, t4_aio_cancel_queued)) { 1232 TAILQ_INSERT_HEAD(&toep->ddp_aiojobq, job, list); 1233 toep->ddp_waiting_count++; 1234 } else 1235 aio_ddp_cancel_one(job); 1236 } 1237 1238 static void 1239 aio_ddp_requeue(struct toepcb *toep) 1240 { 1241 struct adapter *sc = td_adapter(toep->td); 1242 struct socket *so; 1243 struct sockbuf *sb; 1244 struct inpcb *inp; 1245 struct kaiocb *job; 1246 struct ddp_buffer *db; 1247 size_t copied, offset, resid; 1248 struct pageset *ps; 1249 struct mbuf *m; 1250 uint64_t ddp_flags, ddp_flags_mask; 1251 struct wrqe *wr; 1252 int buf_flag, db_idx, error; 1253 1254 DDP_ASSERT_LOCKED(toep); 1255 1256 restart: 1257 if (toep->ddp_flags & DDP_DEAD) { 1258 MPASS(toep->ddp_waiting_count == 0); 1259 MPASS(toep->ddp_active_count == 0); 1260 return; 1261 } 1262 1263 if (toep->ddp_waiting_count == 0 || 1264 toep->ddp_active_count == nitems(toep->db)) { 1265 return; 1266 } 1267 1268 job = TAILQ_FIRST(&toep->ddp_aiojobq); 1269 so = job->fd_file->f_data; 1270 sb = &so->so_rcv; 1271 SOCKBUF_LOCK(sb); 1272 1273 /* We will never get anything unless we are or were connected. */ 1274 if (!(so->so_state & (SS_ISCONNECTED|SS_ISDISCONNECTED))) { 1275 SOCKBUF_UNLOCK(sb); 1276 ddp_complete_all(toep, ENOTCONN); 1277 return; 1278 } 1279 1280 KASSERT(toep->ddp_active_count == 0 || sbavail(sb) == 0, 1281 ("%s: pending sockbuf data and DDP is active", __func__)); 1282 1283 /* Abort if socket has reported problems. */ 1284 /* XXX: Wait for any queued DDP's to finish and/or flush them? */ 1285 if (so->so_error && sbavail(sb) == 0) { 1286 toep->ddp_waiting_count--; 1287 TAILQ_REMOVE(&toep->ddp_aiojobq, job, list); 1288 if (!aio_clear_cancel_function(job)) { 1289 SOCKBUF_UNLOCK(sb); 1290 goto restart; 1291 } 1292 1293 /* 1294 * If this job has previously copied some data, report 1295 * a short read and leave the error to be reported by 1296 * a future request. 1297 */ 1298 copied = job->uaiocb._aiocb_private.status; 1299 if (copied != 0) { 1300 SOCKBUF_UNLOCK(sb); 1301 aio_complete(job, copied, 0); 1302 goto restart; 1303 } 1304 error = so->so_error; 1305 so->so_error = 0; 1306 SOCKBUF_UNLOCK(sb); 1307 aio_complete(job, -1, error); 1308 goto restart; 1309 } 1310 1311 /* 1312 * Door is closed. If there is pending data in the socket buffer, 1313 * deliver it. If there are pending DDP requests, wait for those 1314 * to complete. Once they have completed, return EOF reads. 1315 */ 1316 if (sb->sb_state & SBS_CANTRCVMORE && sbavail(sb) == 0) { 1317 SOCKBUF_UNLOCK(sb); 1318 if (toep->ddp_active_count != 0) 1319 return; 1320 ddp_complete_all(toep, 0); 1321 return; 1322 } 1323 1324 /* 1325 * If DDP is not enabled and there is no pending socket buffer 1326 * data, try to enable DDP. 1327 */ 1328 if (sbavail(sb) == 0 && (toep->ddp_flags & DDP_ON) == 0) { 1329 SOCKBUF_UNLOCK(sb); 1330 1331 /* 1332 * Wait for the card to ACK that DDP is enabled before 1333 * queueing any buffers. Currently this waits for an 1334 * indicate to arrive. This could use a TCB_SET_FIELD_RPL 1335 * message to know that DDP was enabled instead of waiting 1336 * for the indicate which would avoid copying the indicate 1337 * if no data is pending. 1338 * 1339 * XXX: Might want to limit the indicate size to the size 1340 * of the first queued request. 1341 */ 1342 if ((toep->ddp_flags & DDP_SC_REQ) == 0) 1343 enable_ddp(sc, toep); 1344 return; 1345 } 1346 SOCKBUF_UNLOCK(sb); 1347 1348 /* 1349 * If another thread is queueing a buffer for DDP, let it 1350 * drain any work and return. 1351 */ 1352 if (toep->ddp_queueing != NULL) 1353 return; 1354 1355 /* Take the next job to prep it for DDP. */ 1356 toep->ddp_waiting_count--; 1357 TAILQ_REMOVE(&toep->ddp_aiojobq, job, list); 1358 if (!aio_clear_cancel_function(job)) 1359 goto restart; 1360 toep->ddp_queueing = job; 1361 1362 /* NB: This drops DDP_LOCK while it holds the backing VM pages. */ 1363 error = hold_aio(toep, job, &ps); 1364 if (error != 0) { 1365 ddp_complete_one(job, error); 1366 toep->ddp_queueing = NULL; 1367 goto restart; 1368 } 1369 1370 SOCKBUF_LOCK(sb); 1371 if (so->so_error && sbavail(sb) == 0) { 1372 copied = job->uaiocb._aiocb_private.status; 1373 if (copied != 0) { 1374 SOCKBUF_UNLOCK(sb); 1375 recycle_pageset(toep, ps); 1376 aio_complete(job, copied, 0); 1377 toep->ddp_queueing = NULL; 1378 goto restart; 1379 } 1380 1381 error = so->so_error; 1382 so->so_error = 0; 1383 SOCKBUF_UNLOCK(sb); 1384 recycle_pageset(toep, ps); 1385 aio_complete(job, -1, error); 1386 toep->ddp_queueing = NULL; 1387 goto restart; 1388 } 1389 1390 if (sb->sb_state & SBS_CANTRCVMORE && sbavail(sb) == 0) { 1391 SOCKBUF_UNLOCK(sb); 1392 recycle_pageset(toep, ps); 1393 if (toep->ddp_active_count != 0) { 1394 /* 1395 * The door is closed, but there are still pending 1396 * DDP buffers. Requeue. These jobs will all be 1397 * completed once those buffers drain. 1398 */ 1399 aio_ddp_requeue_one(toep, job); 1400 toep->ddp_queueing = NULL; 1401 return; 1402 } 1403 ddp_complete_one(job, 0); 1404 ddp_complete_all(toep, 0); 1405 toep->ddp_queueing = NULL; 1406 return; 1407 } 1408 1409 sbcopy: 1410 /* 1411 * If the toep is dead, there shouldn't be any data in the socket 1412 * buffer, so the above case should have handled this. 1413 */ 1414 MPASS(!(toep->ddp_flags & DDP_DEAD)); 1415 1416 /* 1417 * If there is pending data in the socket buffer (either 1418 * from before the requests were queued or a DDP indicate), 1419 * copy those mbufs out directly. 1420 */ 1421 copied = 0; 1422 offset = ps->offset + job->uaiocb._aiocb_private.status; 1423 MPASS(job->uaiocb._aiocb_private.status <= job->uaiocb.aio_nbytes); 1424 resid = job->uaiocb.aio_nbytes - job->uaiocb._aiocb_private.status; 1425 m = sb->sb_mb; 1426 KASSERT(m == NULL || toep->ddp_active_count == 0, 1427 ("%s: sockbuf data with active DDP", __func__)); 1428 while (m != NULL && resid > 0) { 1429 struct iovec iov[1]; 1430 struct uio uio; 1431 int error; 1432 1433 iov[0].iov_base = mtod(m, void *); 1434 iov[0].iov_len = m->m_len; 1435 if (iov[0].iov_len > resid) 1436 iov[0].iov_len = resid; 1437 uio.uio_iov = iov; 1438 uio.uio_iovcnt = 1; 1439 uio.uio_offset = 0; 1440 uio.uio_resid = iov[0].iov_len; 1441 uio.uio_segflg = UIO_SYSSPACE; 1442 uio.uio_rw = UIO_WRITE; 1443 error = uiomove_fromphys(ps->pages, offset + copied, 1444 uio.uio_resid, &uio); 1445 MPASS(error == 0 && uio.uio_resid == 0); 1446 copied += uio.uio_offset; 1447 resid -= uio.uio_offset; 1448 m = m->m_next; 1449 } 1450 if (copied != 0) { 1451 sbdrop_locked(sb, copied); 1452 job->uaiocb._aiocb_private.status += copied; 1453 copied = job->uaiocb._aiocb_private.status; 1454 inp = sotoinpcb(so); 1455 if (!INP_TRY_WLOCK(inp)) { 1456 /* 1457 * The reference on the socket file descriptor in 1458 * the AIO job should keep 'sb' and 'inp' stable. 1459 * Our caller has a reference on the 'toep' that 1460 * keeps it stable. 1461 */ 1462 SOCKBUF_UNLOCK(sb); 1463 DDP_UNLOCK(toep); 1464 INP_WLOCK(inp); 1465 DDP_LOCK(toep); 1466 SOCKBUF_LOCK(sb); 1467 1468 /* 1469 * If the socket has been closed, we should detect 1470 * that and complete this request if needed on 1471 * the next trip around the loop. 1472 */ 1473 } 1474 t4_rcvd_locked(&toep->td->tod, intotcpcb(inp)); 1475 INP_WUNLOCK(inp); 1476 if (resid == 0 || toep->ddp_flags & DDP_DEAD) { 1477 /* 1478 * We filled the entire buffer with socket 1479 * data, DDP is not being used, or the socket 1480 * is being shut down, so complete the 1481 * request. 1482 */ 1483 SOCKBUF_UNLOCK(sb); 1484 recycle_pageset(toep, ps); 1485 aio_complete(job, copied, 0); 1486 toep->ddp_queueing = NULL; 1487 goto restart; 1488 } 1489 1490 /* 1491 * If DDP is not enabled, requeue this request and restart. 1492 * This will either enable DDP or wait for more data to 1493 * arrive on the socket buffer. 1494 */ 1495 if ((toep->ddp_flags & (DDP_ON | DDP_SC_REQ)) != DDP_ON) { 1496 SOCKBUF_UNLOCK(sb); 1497 recycle_pageset(toep, ps); 1498 aio_ddp_requeue_one(toep, job); 1499 toep->ddp_queueing = NULL; 1500 goto restart; 1501 } 1502 1503 /* 1504 * An indicate might have arrived and been added to 1505 * the socket buffer while it was unlocked after the 1506 * copy to lock the INP. If so, restart the copy. 1507 */ 1508 if (sbavail(sb) != 0) 1509 goto sbcopy; 1510 } 1511 SOCKBUF_UNLOCK(sb); 1512 1513 if (prep_pageset(sc, toep, ps) == 0) { 1514 recycle_pageset(toep, ps); 1515 aio_ddp_requeue_one(toep, job); 1516 toep->ddp_queueing = NULL; 1517 1518 /* 1519 * XXX: Need to retry this later. Mostly need a trigger 1520 * when page pods are freed up. 1521 */ 1522 printf("%s: prep_pageset failed\n", __func__); 1523 return; 1524 } 1525 1526 /* Determine which DDP buffer to use. */ 1527 if (toep->db[0].job == NULL) { 1528 db_idx = 0; 1529 } else { 1530 MPASS(toep->db[1].job == NULL); 1531 db_idx = 1; 1532 } 1533 1534 ddp_flags = 0; 1535 ddp_flags_mask = 0; 1536 if (db_idx == 0) { 1537 ddp_flags |= V_TF_DDP_BUF0_VALID(1); 1538 if (so->so_state & SS_NBIO) 1539 ddp_flags |= V_TF_DDP_BUF0_FLUSH(1); 1540 ddp_flags_mask |= V_TF_DDP_PSH_NO_INVALIDATE0(1) | 1541 V_TF_DDP_PUSH_DISABLE_0(1) | V_TF_DDP_PSHF_ENABLE_0(1) | 1542 V_TF_DDP_BUF0_FLUSH(1) | V_TF_DDP_BUF0_VALID(1); 1543 buf_flag = DDP_BUF0_ACTIVE; 1544 } else { 1545 ddp_flags |= V_TF_DDP_BUF1_VALID(1); 1546 if (so->so_state & SS_NBIO) 1547 ddp_flags |= V_TF_DDP_BUF1_FLUSH(1); 1548 ddp_flags_mask |= V_TF_DDP_PSH_NO_INVALIDATE1(1) | 1549 V_TF_DDP_PUSH_DISABLE_1(1) | V_TF_DDP_PSHF_ENABLE_1(1) | 1550 V_TF_DDP_BUF1_FLUSH(1) | V_TF_DDP_BUF1_VALID(1); 1551 buf_flag = DDP_BUF1_ACTIVE; 1552 } 1553 MPASS((toep->ddp_flags & buf_flag) == 0); 1554 if ((toep->ddp_flags & (DDP_BUF0_ACTIVE | DDP_BUF1_ACTIVE)) == 0) { 1555 MPASS(db_idx == 0); 1556 MPASS(toep->ddp_active_id == -1); 1557 MPASS(toep->ddp_active_count == 0); 1558 ddp_flags_mask |= V_TF_DDP_ACTIVE_BUF(1); 1559 } 1560 1561 /* 1562 * The TID for this connection should still be valid. If DDP_DEAD 1563 * is set, SBS_CANTRCVMORE should be set, so we shouldn't be 1564 * this far anyway. Even if the socket is closing on the other 1565 * end, the AIO job holds a reference on this end of the socket 1566 * which will keep it open and keep the TCP PCB attached until 1567 * after the job is completed. 1568 */ 1569 wr = mk_update_tcb_for_ddp(sc, toep, db_idx, ps, 1570 job->uaiocb._aiocb_private.status, ddp_flags, ddp_flags_mask); 1571 if (wr == NULL) { 1572 recycle_pageset(toep, ps); 1573 aio_ddp_requeue_one(toep, job); 1574 toep->ddp_queueing = NULL; 1575 1576 /* 1577 * XXX: Need a way to kick a retry here. 1578 * 1579 * XXX: We know the fixed size needed and could 1580 * preallocate this using a blocking request at the 1581 * start of the task to avoid having to handle this 1582 * edge case. 1583 */ 1584 printf("%s: mk_update_tcb_for_ddp failed\n", __func__); 1585 return; 1586 } 1587 1588 if (!aio_set_cancel_function(job, t4_aio_cancel_active)) { 1589 free_wrqe(wr); 1590 recycle_pageset(toep, ps); 1591 aio_ddp_cancel_one(job); 1592 toep->ddp_queueing = NULL; 1593 goto restart; 1594 } 1595 1596 #ifdef VERBOSE_TRACES 1597 CTR5(KTR_CXGBE, "%s: scheduling %p for DDP[%d] (flags %#lx/%#lx)", 1598 __func__, job, db_idx, ddp_flags, ddp_flags_mask); 1599 #endif 1600 /* Give the chip the go-ahead. */ 1601 t4_wrq_tx(sc, wr); 1602 db = &toep->db[db_idx]; 1603 db->cancel_pending = 0; 1604 db->job = job; 1605 db->ps = ps; 1606 toep->ddp_queueing = NULL; 1607 toep->ddp_flags |= buf_flag; 1608 toep->ddp_active_count++; 1609 if (toep->ddp_active_count == 1) { 1610 MPASS(toep->ddp_active_id == -1); 1611 toep->ddp_active_id = db_idx; 1612 CTR2(KTR_CXGBE, "%s: ddp_active_id = %d", __func__, 1613 toep->ddp_active_id); 1614 } 1615 goto restart; 1616 } 1617 1618 void 1619 ddp_queue_toep(struct toepcb *toep) 1620 { 1621 1622 DDP_ASSERT_LOCKED(toep); 1623 if (toep->ddp_flags & DDP_TASK_ACTIVE) 1624 return; 1625 toep->ddp_flags |= DDP_TASK_ACTIVE; 1626 hold_toepcb(toep); 1627 soaio_enqueue(&toep->ddp_requeue_task); 1628 } 1629 1630 static void 1631 aio_ddp_requeue_task(void *context, int pending) 1632 { 1633 struct toepcb *toep = context; 1634 1635 DDP_LOCK(toep); 1636 aio_ddp_requeue(toep); 1637 toep->ddp_flags &= ~DDP_TASK_ACTIVE; 1638 DDP_UNLOCK(toep); 1639 1640 free_toepcb(toep); 1641 } 1642 1643 static void 1644 t4_aio_cancel_active(struct kaiocb *job) 1645 { 1646 struct socket *so = job->fd_file->f_data; 1647 struct tcpcb *tp = so_sototcpcb(so); 1648 struct toepcb *toep = tp->t_toe; 1649 struct adapter *sc = td_adapter(toep->td); 1650 uint64_t valid_flag; 1651 int i; 1652 1653 DDP_LOCK(toep); 1654 if (aio_cancel_cleared(job)) { 1655 DDP_UNLOCK(toep); 1656 aio_ddp_cancel_one(job); 1657 return; 1658 } 1659 1660 for (i = 0; i < nitems(toep->db); i++) { 1661 if (toep->db[i].job == job) { 1662 /* Should only ever get one cancel request for a job. */ 1663 MPASS(toep->db[i].cancel_pending == 0); 1664 1665 /* 1666 * Invalidate this buffer. It will be 1667 * cancelled or partially completed once the 1668 * card ACKs the invalidate. 1669 */ 1670 valid_flag = i == 0 ? V_TF_DDP_BUF0_VALID(1) : 1671 V_TF_DDP_BUF1_VALID(1); 1672 t4_set_tcb_field_rpl(sc, toep, 1, W_TCB_RX_DDP_FLAGS, 1673 valid_flag, 0, i + DDP_BUF0_INVALIDATED); 1674 toep->db[i].cancel_pending = 1; 1675 CTR2(KTR_CXGBE, "%s: request %p marked pending", 1676 __func__, job); 1677 break; 1678 } 1679 } 1680 DDP_UNLOCK(toep); 1681 } 1682 1683 static void 1684 t4_aio_cancel_queued(struct kaiocb *job) 1685 { 1686 struct socket *so = job->fd_file->f_data; 1687 struct tcpcb *tp = so_sototcpcb(so); 1688 struct toepcb *toep = tp->t_toe; 1689 1690 DDP_LOCK(toep); 1691 if (!aio_cancel_cleared(job)) { 1692 TAILQ_REMOVE(&toep->ddp_aiojobq, job, list); 1693 toep->ddp_waiting_count--; 1694 if (toep->ddp_waiting_count == 0) 1695 ddp_queue_toep(toep); 1696 } 1697 CTR2(KTR_CXGBE, "%s: request %p cancelled", __func__, job); 1698 DDP_UNLOCK(toep); 1699 1700 aio_ddp_cancel_one(job); 1701 } 1702 1703 int 1704 t4_aio_queue_ddp(struct socket *so, struct kaiocb *job) 1705 { 1706 struct tcpcb *tp = so_sototcpcb(so); 1707 struct toepcb *toep = tp->t_toe; 1708 1709 1710 /* Ignore writes. */ 1711 if (job->uaiocb.aio_lio_opcode != LIO_READ) 1712 return (EOPNOTSUPP); 1713 1714 DDP_LOCK(toep); 1715 1716 /* 1717 * XXX: Think about possibly returning errors for ENOTCONN, 1718 * etc. Perhaps the caller would only queue the request 1719 * if it failed with EOPNOTSUPP? 1720 */ 1721 1722 #ifdef VERBOSE_TRACES 1723 CTR2(KTR_CXGBE, "%s: queueing %p", __func__, job); 1724 #endif 1725 if (!aio_set_cancel_function(job, t4_aio_cancel_queued)) 1726 panic("new job was cancelled"); 1727 TAILQ_INSERT_TAIL(&toep->ddp_aiojobq, job, list); 1728 job->uaiocb._aiocb_private.status = 0; 1729 toep->ddp_waiting_count++; 1730 toep->ddp_flags |= DDP_OK; 1731 1732 /* 1733 * Try to handle this request synchronously. If this has 1734 * to block because the task is running, it will just bail 1735 * and let the task handle it instead. 1736 */ 1737 aio_ddp_requeue(toep); 1738 DDP_UNLOCK(toep); 1739 return (0); 1740 } 1741 1742 int 1743 t4_ddp_mod_load(void) 1744 { 1745 1746 TAILQ_INIT(&ddp_orphan_pagesets); 1747 mtx_init(&ddp_orphan_pagesets_lock, "ddp orphans", NULL, MTX_DEF); 1748 TASK_INIT(&ddp_orphan_task, 0, ddp_free_orphan_pagesets, NULL); 1749 return (0); 1750 } 1751 1752 void 1753 t4_ddp_mod_unload(void) 1754 { 1755 1756 taskqueue_drain(taskqueue_thread, &ddp_orphan_task); 1757 MPASS(TAILQ_EMPTY(&ddp_orphan_pagesets)); 1758 mtx_destroy(&ddp_orphan_pagesets_lock); 1759 } 1760 #endif 1761