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/types.h> 35#include <sys/systm.h> 36#include <sys/kernel.h> 37#include <sys/ktr.h> 38#include <sys/module.h> 39#include <sys/protosw.h> 40#include <sys/proc.h> 41#include <sys/domain.h> 42#include <sys/socket.h> 43#include <sys/socketvar.h> 44#include <sys/uio.h> 45#include <netinet/in.h> 46#include <netinet/in_pcb.h> 47#include <netinet/ip.h> 48#include <netinet/tcp_var.h> 49#define TCPSTATES 50#include <netinet/tcp_fsm.h> 51#include <netinet/toecore.h> 52 53#include <vm/vm.h> 54#include <vm/vm_extern.h> 55#include <vm/vm_param.h> 56#include <vm/pmap.h> 57#include <vm/vm_map.h> 58#include <vm/vm_page.h> 59#include <vm/vm_object.h> 60 61#ifdef TCP_OFFLOAD 62#include "common/common.h" 63#include "common/t4_msg.h" 64#include "common/t4_regs.h" 65#include "common/t4_tcb.h" 66#include "tom/t4_tom.h" 67 68#define PPOD_SZ(n) ((n) * sizeof(struct pagepod)) 69#define PPOD_SIZE (PPOD_SZ(1)) 70 71/* XXX: must match A_ULP_RX_TDDP_PSZ */ 72static int t4_ddp_pgsz[] = {4096, 4096 << 2, 4096 << 4, 4096 << 6}; 73 74#if 0 75static void 76t4_dump_tcb(struct adapter *sc, int tid) 77{ 78 uint32_t tcb_base, off, i, j; 79 80 /* Dump TCB for the tid */ 81 tcb_base = t4_read_reg(sc, A_TP_CMM_TCB_BASE); 82 t4_write_reg(sc, PCIE_MEM_ACCESS_REG(A_PCIE_MEM_ACCESS_OFFSET, 2), 83 tcb_base + tid * TCB_SIZE); 84 t4_read_reg(sc, PCIE_MEM_ACCESS_REG(A_PCIE_MEM_ACCESS_OFFSET, 2)); 85 off = 0; 86 printf("\n"); 87 for (i = 0; i < 4; i++) { 88 uint32_t buf[8]; 89 for (j = 0; j < 8; j++, off += 4) 90 buf[j] = htonl(t4_read_reg(sc, MEMWIN2_BASE + off)); 91 92 printf("%08x %08x %08x %08x %08x %08x %08x %08x\n", 93 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], 94 buf[7]); 95 } 96} 97#endif 98 99#define MAX_DDP_BUFFER_SIZE (M_TCB_RX_DDP_BUF0_LEN) 100static int 101alloc_ppods(struct tom_data *td, int n, struct ppod_region *pr) 102{ 103 int ppod; 104 105 KASSERT(n > 0, ("%s: nonsense allocation (%d)", __func__, n)); 106 107 mtx_lock(&td->ppod_lock); 108 if (n > td->nppods_free) { 109 mtx_unlock(&td->ppod_lock); 110 return (-1); 111 } 112 113 if (td->nppods_free_head >= n) { 114 td->nppods_free_head -= n; 115 ppod = td->nppods_free_head; 116 TAILQ_INSERT_HEAD(&td->ppods, pr, link); 117 } else { 118 struct ppod_region *p; 119 120 ppod = td->nppods_free_head; 121 TAILQ_FOREACH(p, &td->ppods, link) { 122 ppod += p->used + p->free; 123 if (n <= p->free) { 124 ppod -= n; 125 p->free -= n; 126 TAILQ_INSERT_AFTER(&td->ppods, p, pr, link); 127 goto allocated; 128 } 129 } 130 131 if (__predict_false(ppod != td->nppods)) { 132 panic("%s: ppods TAILQ (%p) corrupt." 133 " At %d instead of %d at the end of the queue.", 134 __func__, &td->ppods, ppod, td->nppods); 135 } 136 137 mtx_unlock(&td->ppod_lock); 138 return (-1); 139 } 140 141allocated: 142 pr->used = n; 143 pr->free = 0; 144 td->nppods_free -= n; 145 mtx_unlock(&td->ppod_lock); 146 147 return (ppod); 148} 149 150static void 151free_ppods(struct tom_data *td, struct ppod_region *pr) 152{ 153 struct ppod_region *p; 154 155 KASSERT(pr->used > 0, ("%s: nonsense free (%d)", __func__, pr->used)); 156 157 mtx_lock(&td->ppod_lock); 158 p = TAILQ_PREV(pr, ppod_head, link); 159 if (p != NULL) 160 p->free += pr->used + pr->free; 161 else 162 td->nppods_free_head += pr->used + pr->free; 163 td->nppods_free += pr->used; 164 KASSERT(td->nppods_free <= td->nppods, 165 ("%s: nppods_free (%d) > nppods (%d). %d freed this time.", 166 __func__, td->nppods_free, td->nppods, pr->used)); 167 TAILQ_REMOVE(&td->ppods, pr, link); 168 mtx_unlock(&td->ppod_lock); 169} 170 171static inline int 172pages_to_nppods(int npages, int ddp_pgsz) 173{ 174 int nsegs = npages * PAGE_SIZE / ddp_pgsz; 175 176 return (howmany(nsegs, PPOD_PAGES)); 177} 178 179static void 180free_ddp_buffer(struct tom_data *td, struct ddp_buffer *db) 181{ 182 183 if (db == NULL) 184 return; 185 186 if (db->pages) 187 free(db->pages, M_CXGBE); 188 189 if (db->nppods > 0) 190 free_ppods(td, &db->ppod_region); 191 192 free(db, M_CXGBE); 193} 194 195void 196release_ddp_resources(struct toepcb *toep) 197{ 198 int i; 199 200 for (i = 0; i < nitems(toep->db); i++) { 201 if (toep->db[i] != NULL) { 202 free_ddp_buffer(toep->td, toep->db[i]); 203 toep->db[i] = NULL; 204 } 205 } 206} 207 208/* XXX: handle_ddp_data code duplication */ 209void 210insert_ddp_data(struct toepcb *toep, uint32_t n) 211{ 212 struct inpcb *inp = toep->inp; 213 struct tcpcb *tp = intotcpcb(inp); 214 struct sockbuf *sb = &inp->inp_socket->so_rcv; 215 struct mbuf *m; 216 217 INP_WLOCK_ASSERT(inp); 218 SOCKBUF_LOCK_ASSERT(sb); 219 220 m = get_ddp_mbuf(n); 221 tp->rcv_nxt += n; 222#ifndef USE_DDP_RX_FLOW_CONTROL 223 KASSERT(tp->rcv_wnd >= n, ("%s: negative window size", __func__)); 224 tp->rcv_wnd -= n; 225#endif 226 227 KASSERT(toep->sb_cc >= sb->sb_cc, 228 ("%s: sb %p has more data (%d) than last time (%d).", 229 __func__, sb, sb->sb_cc, toep->sb_cc)); 230 toep->rx_credits += toep->sb_cc - sb->sb_cc; 231#ifdef USE_DDP_RX_FLOW_CONTROL 232 toep->rx_credits -= n; /* adjust for F_RX_FC_DDP */ 233#endif 234 sbappendstream_locked(sb, m); 235 toep->sb_cc = sb->sb_cc; 236} 237 238/* SET_TCB_FIELD sent as a ULP command looks like this */ 239#define LEN__SET_TCB_FIELD_ULP (sizeof(struct ulp_txpkt) + \ 240 sizeof(struct ulptx_idata) + sizeof(struct cpl_set_tcb_field_core)) 241 242/* RX_DATA_ACK sent as a ULP command looks like this */ 243#define LEN__RX_DATA_ACK_ULP (sizeof(struct ulp_txpkt) + \ 244 sizeof(struct ulptx_idata) + sizeof(struct cpl_rx_data_ack_core)) 245 246static inline void * 247mk_set_tcb_field_ulp(struct ulp_txpkt *ulpmc, struct toepcb *toep, 248 uint64_t word, uint64_t mask, uint64_t val) 249{ 250 struct ulptx_idata *ulpsc; 251 struct cpl_set_tcb_field_core *req; 252 253 ulpmc->cmd_dest = htonl(V_ULPTX_CMD(ULP_TX_PKT) | V_ULP_TXPKT_DEST(0)); 254 ulpmc->len = htobe32(howmany(LEN__SET_TCB_FIELD_ULP, 16)); 255 256 ulpsc = (struct ulptx_idata *)(ulpmc + 1); 257 ulpsc->cmd_more = htobe32(V_ULPTX_CMD(ULP_TX_SC_IMM)); 258 ulpsc->len = htobe32(sizeof(*req)); 259 260 req = (struct cpl_set_tcb_field_core *)(ulpsc + 1); 261 OPCODE_TID(req) = htobe32(MK_OPCODE_TID(CPL_SET_TCB_FIELD, toep->tid)); 262 req->reply_ctrl = htobe16(V_NO_REPLY(1) | 263 V_QUEUENO(toep->ofld_rxq->iq.abs_id)); 264 req->word_cookie = htobe16(V_WORD(word) | V_COOKIE(0)); 265 req->mask = htobe64(mask); 266 req->val = htobe64(val); 267 268 ulpsc = (struct ulptx_idata *)(req + 1); 269 if (LEN__SET_TCB_FIELD_ULP % 16) { 270 ulpsc->cmd_more = htobe32(V_ULPTX_CMD(ULP_TX_SC_NOOP)); 271 ulpsc->len = htobe32(0); 272 return (ulpsc + 1); 273 } 274 return (ulpsc); 275} 276 277static inline void * 278mk_rx_data_ack_ulp(struct ulp_txpkt *ulpmc, struct toepcb *toep) 279{ 280 struct ulptx_idata *ulpsc; 281 struct cpl_rx_data_ack_core *req; 282 283 ulpmc->cmd_dest = htonl(V_ULPTX_CMD(ULP_TX_PKT) | V_ULP_TXPKT_DEST(0)); 284 ulpmc->len = htobe32(howmany(LEN__RX_DATA_ACK_ULP, 16)); 285 286 ulpsc = (struct ulptx_idata *)(ulpmc + 1); 287 ulpsc->cmd_more = htobe32(V_ULPTX_CMD(ULP_TX_SC_IMM)); 288 ulpsc->len = htobe32(sizeof(*req)); 289 290 req = (struct cpl_rx_data_ack_core *)(ulpsc + 1); 291 OPCODE_TID(req) = htobe32(MK_OPCODE_TID(CPL_RX_DATA_ACK, toep->tid)); 292 req->credit_dack = htobe32(F_RX_MODULATE_RX); 293 294 ulpsc = (struct ulptx_idata *)(req + 1); 295 if (LEN__RX_DATA_ACK_ULP % 16) { 296 ulpsc->cmd_more = htobe32(V_ULPTX_CMD(ULP_TX_SC_NOOP)); 297 ulpsc->len = htobe32(0); 298 return (ulpsc + 1); 299 } 300 return (ulpsc); 301} 302 303static inline uint64_t 304select_ddp_flags(struct socket *so, int flags, int db_idx) 305{ 306 uint64_t ddp_flags = V_TF_DDP_INDICATE_OUT(0); 307 int waitall = flags & MSG_WAITALL; 308 int nb = so->so_state & SS_NBIO || flags & (MSG_DONTWAIT | MSG_NBIO); 309 310 KASSERT(db_idx == 0 || db_idx == 1, 311 ("%s: bad DDP buffer index %d", __func__, db_idx)); 312 313 if (db_idx == 0) { 314 ddp_flags |= V_TF_DDP_BUF0_VALID(1) | V_TF_DDP_ACTIVE_BUF(0); 315 if (waitall) 316 ddp_flags |= V_TF_DDP_PUSH_DISABLE_0(1); 317 else if (nb) 318 ddp_flags |= V_TF_DDP_BUF0_FLUSH(1); 319 else 320 ddp_flags |= V_TF_DDP_BUF0_FLUSH(0); 321 } else { 322 ddp_flags |= V_TF_DDP_BUF1_VALID(1) | V_TF_DDP_ACTIVE_BUF(1); 323 if (waitall) 324 ddp_flags |= V_TF_DDP_PUSH_DISABLE_1(1); 325 else if (nb) 326 ddp_flags |= V_TF_DDP_BUF1_FLUSH(1); 327 else 328 ddp_flags |= V_TF_DDP_BUF1_FLUSH(0); 329 } 330 331 return (ddp_flags); 332} 333 334static struct wrqe * 335mk_update_tcb_for_ddp(struct adapter *sc, struct toepcb *toep, int db_idx, 336 int offset, uint64_t ddp_flags) 337{ 338 struct ddp_buffer *db = toep->db[db_idx]; 339 struct wrqe *wr; 340 struct work_request_hdr *wrh; 341 struct ulp_txpkt *ulpmc; 342 int len; 343 344 KASSERT(db_idx == 0 || db_idx == 1, 345 ("%s: bad DDP buffer index %d", __func__, db_idx)); 346 347 /* 348 * We'll send a compound work request that has 3 SET_TCB_FIELDs and an 349 * RX_DATA_ACK (with RX_MODULATE to speed up delivery). 350 * 351 * The work request header is 16B and always ends at a 16B boundary. 352 * The ULPTX master commands that follow must all end at 16B boundaries 353 * too so we round up the size to 16. 354 */ 355 len = sizeof(*wrh) + 3 * roundup2(LEN__SET_TCB_FIELD_ULP, 16) + 356 roundup2(LEN__RX_DATA_ACK_ULP, 16); 357 358 wr = alloc_wrqe(len, toep->ctrlq); 359 if (wr == NULL) 360 return (NULL); 361 wrh = wrtod(wr); 362 INIT_ULPTX_WRH(wrh, len, 1, 0); /* atomic */ 363 ulpmc = (struct ulp_txpkt *)(wrh + 1); 364 365 /* Write the buffer's tag */ 366 ulpmc = mk_set_tcb_field_ulp(ulpmc, toep, 367 W_TCB_RX_DDP_BUF0_TAG + db_idx, 368 V_TCB_RX_DDP_BUF0_TAG(M_TCB_RX_DDP_BUF0_TAG), 369 V_TCB_RX_DDP_BUF0_TAG(db->tag)); 370 371 /* Update the current offset in the DDP buffer and its total length */ 372 if (db_idx == 0) 373 ulpmc = mk_set_tcb_field_ulp(ulpmc, toep, 374 W_TCB_RX_DDP_BUF0_OFFSET, 375 V_TCB_RX_DDP_BUF0_OFFSET(M_TCB_RX_DDP_BUF0_OFFSET) | 376 V_TCB_RX_DDP_BUF0_LEN(M_TCB_RX_DDP_BUF0_LEN), 377 V_TCB_RX_DDP_BUF0_OFFSET(offset) | 378 V_TCB_RX_DDP_BUF0_LEN(db->len)); 379 else 380 ulpmc = mk_set_tcb_field_ulp(ulpmc, toep, 381 W_TCB_RX_DDP_BUF1_OFFSET, 382 V_TCB_RX_DDP_BUF1_OFFSET(M_TCB_RX_DDP_BUF1_OFFSET) | 383 V_TCB_RX_DDP_BUF1_LEN((u64)M_TCB_RX_DDP_BUF1_LEN << 32), 384 V_TCB_RX_DDP_BUF1_OFFSET(offset) | 385 V_TCB_RX_DDP_BUF1_LEN((u64)db->len << 32)); 386 387 /* Update DDP flags */ 388 ulpmc = mk_set_tcb_field_ulp(ulpmc, toep, W_TCB_RX_DDP_FLAGS, 389 V_TF_DDP_BUF0_FLUSH(1) | V_TF_DDP_BUF1_FLUSH(1) | 390 V_TF_DDP_PUSH_DISABLE_0(1) | V_TF_DDP_PUSH_DISABLE_1(1) | 391 V_TF_DDP_BUF0_VALID(1) | V_TF_DDP_BUF1_VALID(1) | 392 V_TF_DDP_ACTIVE_BUF(1) | V_TF_DDP_INDICATE_OUT(1), ddp_flags); 393 394 /* Gratuitous RX_DATA_ACK with RX_MODULATE set to speed up delivery. */ 395 ulpmc = mk_rx_data_ack_ulp(ulpmc, toep); 396 397 return (wr); 398} 399 400static void 401discourage_ddp(struct toepcb *toep) 402{ 403 404 if (toep->ddp_score && --toep->ddp_score == 0) { 405 toep->ddp_flags &= ~DDP_OK; 406 toep->ddp_disabled = time_uptime; 407 CTR3(KTR_CXGBE, "%s: tid %u !DDP_OK @ %u", 408 __func__, toep->tid, time_uptime); 409 } 410} 411 412static int 413handle_ddp_data(struct toepcb *toep, __be32 ddp_report, __be32 rcv_nxt, int len) 414{ 415 uint32_t report = be32toh(ddp_report); 416 unsigned int db_flag; 417 struct inpcb *inp = toep->inp; 418 struct tcpcb *tp; 419 struct socket *so; 420 struct sockbuf *sb; 421 struct mbuf *m; 422 423 db_flag = report & F_DDP_BUF_IDX ? DDP_BUF1_ACTIVE : DDP_BUF0_ACTIVE; 424 425 if (__predict_false(!(report & F_DDP_INV))) 426 CXGBE_UNIMPLEMENTED("DDP buffer still valid"); 427 428 INP_WLOCK(inp); 429 so = inp_inpcbtosocket(inp); 430 sb = &so->so_rcv; 431 if (__predict_false(inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT))) { 432 433 /* 434 * XXX: think a bit more. 435 * tcpcb probably gone, but socket should still be around 436 * because we always wait for DDP completion in soreceive no 437 * matter what. Just wake it up and let it clean up. 438 */ 439 440 CTR5(KTR_CXGBE, "%s: tid %u, seq 0x%x, len %d, inp_flags 0x%x", 441 __func__, toep->tid, be32toh(rcv_nxt), len, inp->inp_flags); 442 SOCKBUF_LOCK(sb); 443 goto wakeup; 444 } 445 446 tp = intotcpcb(inp); 447 len += be32toh(rcv_nxt) - tp->rcv_nxt; 448 tp->rcv_nxt += len; 449 tp->t_rcvtime = ticks; 450#ifndef USE_DDP_RX_FLOW_CONTROL 451 KASSERT(tp->rcv_wnd >= len, ("%s: negative window size", __func__)); 452 tp->rcv_wnd -= len; 453#endif 454 m = get_ddp_mbuf(len); 455 456 SOCKBUF_LOCK(sb); 457 if (report & F_DDP_BUF_COMPLETE) 458 toep->ddp_score = DDP_HIGH_SCORE; 459 else 460 discourage_ddp(toep); 461 462 KASSERT(toep->sb_cc >= sb->sb_cc, 463 ("%s: sb %p has more data (%d) than last time (%d).", 464 __func__, sb, sb->sb_cc, toep->sb_cc)); 465 toep->rx_credits += toep->sb_cc - sb->sb_cc; 466#ifdef USE_DDP_RX_FLOW_CONTROL 467 toep->rx_credits -= len; /* adjust for F_RX_FC_DDP */ 468#endif 469 sbappendstream_locked(sb, m); 470 toep->sb_cc = sb->sb_cc; 471wakeup: 472 KASSERT(toep->ddp_flags & db_flag, 473 ("%s: DDP buffer not active. toep %p, ddp_flags 0x%x, report 0x%x", 474 __func__, toep, toep->ddp_flags, report)); 475 toep->ddp_flags &= ~db_flag; 476 sorwakeup_locked(so); 477 SOCKBUF_UNLOCK_ASSERT(sb); 478 479 INP_WUNLOCK(inp); 480 return (0); 481} 482 483#define DDP_ERR (F_DDP_PPOD_MISMATCH | F_DDP_LLIMIT_ERR | F_DDP_ULIMIT_ERR |\ 484 F_DDP_PPOD_PARITY_ERR | F_DDP_PADDING_ERR | F_DDP_OFFSET_ERR |\ 485 F_DDP_INVALID_TAG | F_DDP_COLOR_ERR | F_DDP_TID_MISMATCH |\ 486 F_DDP_INVALID_PPOD | F_DDP_HDRCRC_ERR | F_DDP_DATACRC_ERR) 487 488static int 489do_rx_data_ddp(struct sge_iq *iq, const struct rss_header *rss, struct mbuf *m) 490{ 491 struct adapter *sc = iq->adapter; 492 const struct cpl_rx_data_ddp *cpl = (const void *)(rss + 1); 493 unsigned int tid = GET_TID(cpl); 494 uint32_t vld; 495 struct toepcb *toep = lookup_tid(sc, tid); 496 497 KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__)); 498 KASSERT(toep->tid == tid, ("%s: toep tid/atid mismatch", __func__)); 499 KASSERT(!(toep->flags & TPF_SYNQE), 500 ("%s: toep %p claims to be a synq entry", __func__, toep)); 501 502 vld = be32toh(cpl->ddpvld); 503 if (__predict_false(vld & DDP_ERR)) { 504 panic("%s: DDP error 0x%x (tid %d, toep %p)", 505 __func__, vld, tid, toep); 506 } 507 508 handle_ddp_data(toep, cpl->u.ddp_report, cpl->seq, be16toh(cpl->len)); 509 510 return (0); 511} 512 513static int 514do_rx_ddp_complete(struct sge_iq *iq, const struct rss_header *rss, 515 struct mbuf *m) 516{ 517 struct adapter *sc = iq->adapter; 518 const struct cpl_rx_ddp_complete *cpl = (const void *)(rss + 1); 519 unsigned int tid = GET_TID(cpl); 520 struct toepcb *toep = lookup_tid(sc, tid); 521 522 KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__)); 523 KASSERT(toep->tid == tid, ("%s: toep tid/atid mismatch", __func__)); 524 KASSERT(!(toep->flags & TPF_SYNQE), 525 ("%s: toep %p claims to be a synq entry", __func__, toep)); 526 527 handle_ddp_data(toep, cpl->ddp_report, cpl->rcv_nxt, 0); 528 529 return (0); 530} 531 532void 533enable_ddp(struct adapter *sc, struct toepcb *toep) 534{ 535 536 KASSERT((toep->ddp_flags & (DDP_ON | DDP_OK | DDP_SC_REQ)) == DDP_OK, 537 ("%s: toep %p has bad ddp_flags 0x%x", 538 __func__, toep, toep->ddp_flags)); 539 540 CTR3(KTR_CXGBE, "%s: tid %u (time %u)", 541 __func__, toep->tid, time_uptime); 542 543 toep->ddp_flags |= DDP_SC_REQ; 544 t4_set_tcb_field(sc, toep, 1, W_TCB_RX_DDP_FLAGS, 545 V_TF_DDP_OFF(1) | V_TF_DDP_INDICATE_OUT(1) | 546 V_TF_DDP_BUF0_INDICATE(1) | V_TF_DDP_BUF1_INDICATE(1) | 547 V_TF_DDP_BUF0_VALID(1) | V_TF_DDP_BUF1_VALID(1), 548 V_TF_DDP_BUF0_INDICATE(1) | V_TF_DDP_BUF1_INDICATE(1)); 549 t4_set_tcb_field(sc, toep, 1, W_TCB_T_FLAGS, 550 V_TF_RCV_COALESCE_ENABLE(1), 0); 551} 552 553static inline void 554disable_ddp(struct adapter *sc, struct toepcb *toep) 555{ 556 557 KASSERT((toep->ddp_flags & (DDP_ON | DDP_SC_REQ)) == DDP_ON, 558 ("%s: toep %p has bad ddp_flags 0x%x", 559 __func__, toep, toep->ddp_flags)); 560 561 CTR3(KTR_CXGBE, "%s: tid %u (time %u)", 562 __func__, toep->tid, time_uptime); 563 564 toep->ddp_flags |= DDP_SC_REQ; 565 t4_set_tcb_field(sc, toep, 1, W_TCB_T_FLAGS, 566 V_TF_RCV_COALESCE_ENABLE(1), V_TF_RCV_COALESCE_ENABLE(1)); 567 t4_set_tcb_field(sc, toep, 1, W_TCB_RX_DDP_FLAGS, V_TF_DDP_OFF(1), 568 V_TF_DDP_OFF(1)); 569} 570 571static int 572hold_uio(struct uio *uio, vm_page_t **ppages, int *pnpages) 573{ 574 struct vm_map *map; 575 struct iovec *iov; 576 vm_offset_t start, end; 577 vm_page_t *pp; 578 int n; 579 580 KASSERT(uio->uio_iovcnt == 1, 581 ("%s: uio_iovcnt %d", __func__, uio->uio_iovcnt)); 582 KASSERT(uio->uio_td->td_proc == curproc, 583 ("%s: uio proc (%p) is not curproc (%p)", 584 __func__, uio->uio_td->td_proc, curproc)); 585 586 map = &curproc->p_vmspace->vm_map; 587 iov = &uio->uio_iov[0]; 588 start = trunc_page((uintptr_t)iov->iov_base); 589 end = round_page((vm_offset_t)iov->iov_base + iov->iov_len); 590 n = howmany(end - start, PAGE_SIZE); 591 592 if (end - start > MAX_DDP_BUFFER_SIZE) 593 return (E2BIG); 594 595 pp = malloc(n * sizeof(vm_page_t), M_CXGBE, M_NOWAIT); 596 if (pp == NULL) 597 return (ENOMEM); 598 599 if (vm_fault_quick_hold_pages(map, (vm_offset_t)iov->iov_base, 600 iov->iov_len, VM_PROT_WRITE, pp, n) < 0) { 601 free(pp, M_CXGBE); 602 return (EFAULT); 603 } 604 605 *ppages = pp; 606 *pnpages = n; 607 608 return (0); 609} 610 611static int 612bufcmp(struct ddp_buffer *db, vm_page_t *pages, int npages, int offset, int len) 613{ 614 int i; 615 616 if (db == NULL || db->npages != npages || db->offset != offset || 617 db->len != len) 618 return (1); 619 620 for (i = 0; i < npages; i++) { 621 if (pages[i]->phys_addr != db->pages[i]->phys_addr) 622 return (1); 623 } 624 625 return (0); 626} 627 628static int 629calculate_hcf(int n1, int n2) 630{ 631 int a, b, t; 632 633 if (n1 <= n2) { 634 a = n1; 635 b = n2; 636 } else { 637 a = n2; 638 b = n1; 639 } 640 641 while (a != 0) { 642 t = a; 643 a = b % a; 644 b = t; 645 } 646 647 return (b); 648} 649 650static struct ddp_buffer * 651alloc_ddp_buffer(struct tom_data *td, vm_page_t *pages, int npages, int offset, 652 int len) 653{ 654 int i, hcf, seglen, idx, ppod, nppods; 655 struct ddp_buffer *db; 656 657 /* 658 * The DDP page size is unrelated to the VM page size. We combine 659 * contiguous physical pages into larger segments to get the best DDP 660 * page size possible. This is the largest of the four sizes in 661 * A_ULP_RX_TDDP_PSZ that evenly divides the HCF of the segment sizes in 662 * the page list. 663 */ 664 hcf = 0; 665 for (i = 0; i < npages; i++) { 666 seglen = PAGE_SIZE; 667 while (i < npages - 1 && 668 pages[i]->phys_addr + PAGE_SIZE == pages[i + 1]->phys_addr) { 669 seglen += PAGE_SIZE; 670 i++; 671 } 672 673 hcf = calculate_hcf(hcf, seglen); 674 if (hcf < t4_ddp_pgsz[1]) { 675 idx = 0; 676 goto have_pgsz; /* give up, short circuit */ 677 } 678 } 679 680 if (hcf % t4_ddp_pgsz[0] != 0) { 681 /* hmmm. This could only happen when PAGE_SIZE < 4K */ 682 KASSERT(PAGE_SIZE < 4096, 683 ("%s: PAGE_SIZE %d, hcf %d", __func__, PAGE_SIZE, hcf)); 684 CTR3(KTR_CXGBE, "%s: PAGE_SIZE %d, hcf %d", 685 __func__, PAGE_SIZE, hcf); 686 return (NULL); 687 } 688 689 for (idx = nitems(t4_ddp_pgsz) - 1; idx > 0; idx--) { 690 if (hcf % t4_ddp_pgsz[idx] == 0) 691 break; 692 } 693have_pgsz: 694 695 db = malloc(sizeof(*db), M_CXGBE, M_NOWAIT); 696 if (db == NULL) { 697 CTR1(KTR_CXGBE, "%s: malloc failed.", __func__); 698 return (NULL); 699 } 700 701 nppods = pages_to_nppods(npages, t4_ddp_pgsz[idx]); 702 ppod = alloc_ppods(td, nppods, &db->ppod_region); 703 if (ppod < 0) { 704 free(db, M_CXGBE); 705 CTR4(KTR_CXGBE, "%s: no pods, nppods %d, resid %d, pgsz %d", 706 __func__, nppods, len, t4_ddp_pgsz[idx]); 707 return (NULL); 708 } 709 710 KASSERT(idx <= M_PPOD_PGSZ && ppod <= M_PPOD_TAG, 711 ("%s: DDP pgsz_idx = %d, ppod = %d", __func__, idx, ppod)); 712 713 db->tag = V_PPOD_PGSZ(idx) | V_PPOD_TAG(ppod); 714 db->nppods = nppods; 715 db->npages = npages; 716 db->pages = pages; 717 db->offset = offset; 718 db->len = len; 719 720 CTR6(KTR_CXGBE, "New DDP buffer. " 721 "ddp_pgsz %d, ppod 0x%x, npages %d, nppods %d, offset %d, len %d", 722 t4_ddp_pgsz[idx], ppod, db->npages, db->nppods, db->offset, 723 db->len); 724 725 return (db); 726} 727 728#define NUM_ULP_TX_SC_IMM_PPODS (256 / PPOD_SIZE) 729 730static int 731write_page_pods(struct adapter *sc, struct toepcb *toep, struct ddp_buffer *db) 732{ 733 struct wrqe *wr; 734 struct ulp_mem_io *ulpmc; 735 struct ulptx_idata *ulpsc; 736 struct pagepod *ppod; 737 int i, j, k, n, chunk, len, ddp_pgsz, idx, ppod_addr; 738 uint32_t cmd; 739 740 cmd = htobe32(V_ULPTX_CMD(ULP_TX_MEM_WRITE)); 741 if (is_t4(sc)) 742 cmd |= htobe32(F_ULP_MEMIO_ORDER); 743 else 744 cmd |= htobe32(F_T5_ULP_MEMIO_IMM); 745 ddp_pgsz = t4_ddp_pgsz[G_PPOD_PGSZ(db->tag)]; 746 ppod_addr = sc->vres.ddp.start + G_PPOD_TAG(db->tag) * PPOD_SIZE; 747 for (i = 0; i < db->nppods; ppod_addr += chunk) { 748 749 /* How many page pods are we writing in this cycle */ 750 n = min(db->nppods - i, NUM_ULP_TX_SC_IMM_PPODS); 751 chunk = PPOD_SZ(n); 752 len = roundup2(sizeof(*ulpmc) + sizeof(*ulpsc) + chunk, 16); 753 754 wr = alloc_wrqe(len, toep->ctrlq); 755 if (wr == NULL) 756 return (ENOMEM); /* ok to just bail out */ 757 ulpmc = wrtod(wr); 758 759 INIT_ULPTX_WR(ulpmc, len, 0, 0); 760 ulpmc->cmd = cmd; 761 ulpmc->dlen = htobe32(V_ULP_MEMIO_DATA_LEN(chunk / 32)); 762 ulpmc->len16 = htobe32(howmany(len - sizeof(ulpmc->wr), 16)); 763 ulpmc->lock_addr = htobe32(V_ULP_MEMIO_ADDR(ppod_addr >> 5)); 764 765 ulpsc = (struct ulptx_idata *)(ulpmc + 1); 766 ulpsc->cmd_more = htobe32(V_ULPTX_CMD(ULP_TX_SC_IMM)); 767 ulpsc->len = htobe32(chunk); 768 769 ppod = (struct pagepod *)(ulpsc + 1); 770 for (j = 0; j < n; i++, j++, ppod++) { 771 ppod->vld_tid_pgsz_tag_color = htobe64(F_PPOD_VALID | 772 V_PPOD_TID(toep->tid) | db->tag); 773 ppod->len_offset = htobe64(V_PPOD_LEN(db->len) | 774 V_PPOD_OFST(db->offset)); 775 ppod->rsvd = 0; 776 idx = i * PPOD_PAGES * (ddp_pgsz / PAGE_SIZE); 777 for (k = 0; k < nitems(ppod->addr); k++) { 778 if (idx < db->npages) { 779 ppod->addr[k] = 780 htobe64(db->pages[idx]->phys_addr); 781 idx += ddp_pgsz / PAGE_SIZE; 782 } else 783 ppod->addr[k] = 0; 784#if 0 785 CTR5(KTR_CXGBE, 786 "%s: tid %d ppod[%d]->addr[%d] = %p", 787 __func__, toep->tid, i, k, 788 htobe64(ppod->addr[k])); 789#endif 790 } 791 792 } 793 794 t4_wrq_tx(sc, wr); 795 } 796 797 return (0); 798} 799 800/* 801 * Reuse, or allocate (and program the page pods for) a new DDP buffer. The 802 * "pages" array is handed over to this function and should not be used in any 803 * way by the caller after that. 804 */ 805static int 806select_ddp_buffer(struct adapter *sc, struct toepcb *toep, vm_page_t *pages, 807 int npages, int db_off, int db_len) 808{ 809 struct ddp_buffer *db; 810 struct tom_data *td = sc->tom_softc; 811 int i, empty_slot = -1; 812 813 /* Try to reuse */ 814 for (i = 0; i < nitems(toep->db); i++) { 815 if (bufcmp(toep->db[i], pages, npages, db_off, db_len) == 0) { 816 free(pages, M_CXGBE); 817 return (i); /* pages still held */ 818 } else if (toep->db[i] == NULL && empty_slot < 0) 819 empty_slot = i; 820 } 821 822 /* Allocate new buffer, write its page pods. */ 823 db = alloc_ddp_buffer(td, pages, npages, db_off, db_len); 824 if (db == NULL) { 825 vm_page_unhold_pages(pages, npages); 826 free(pages, M_CXGBE); 827 return (-1); 828 } 829 if (write_page_pods(sc, toep, db) != 0) { 830 vm_page_unhold_pages(pages, npages); 831 free_ddp_buffer(td, db); 832 return (-1); 833 } 834 835 i = empty_slot; 836 if (i < 0) { 837 i = arc4random() % nitems(toep->db); 838 free_ddp_buffer(td, toep->db[i]); 839 } 840 toep->db[i] = db; 841 842 CTR5(KTR_CXGBE, "%s: tid %d, DDP buffer[%d] = %p (tag 0x%x)", 843 __func__, toep->tid, i, db, db->tag); 844 845 return (i); 846} 847 848static void 849wire_ddp_buffer(struct ddp_buffer *db) 850{ 851 int i; 852 vm_page_t p; 853 854 for (i = 0; i < db->npages; i++) { 855 p = db->pages[i]; 856 vm_page_lock(p); 857 vm_page_wire(p); 858 vm_page_unhold(p); 859 vm_page_unlock(p); 860 } 861} 862 863static void 864unwire_ddp_buffer(struct ddp_buffer *db) 865{ 866 int i; 867 vm_page_t p; 868 869 for (i = 0; i < db->npages; i++) { 870 p = db->pages[i]; 871 vm_page_lock(p); 872 vm_page_unwire(p, 0); 873 vm_page_unlock(p); 874 } 875} 876 877static int 878handle_ddp(struct socket *so, struct uio *uio, int flags, int error) 879{ 880 struct sockbuf *sb = &so->so_rcv; 881 struct tcpcb *tp = so_sototcpcb(so); 882 struct toepcb *toep = tp->t_toe; 883 struct adapter *sc = td_adapter(toep->td); 884 vm_page_t *pages; 885 int npages, db_idx, rc, buf_flag; 886 struct ddp_buffer *db; 887 struct wrqe *wr; 888 uint64_t ddp_flags; 889 890 SOCKBUF_LOCK_ASSERT(sb); 891 892#if 0 893 if (sb->sb_cc + sc->tt.ddp_thres > uio->uio_resid) { 894 CTR4(KTR_CXGBE, "%s: sb_cc %d, threshold %d, resid %d", 895 __func__, sb->sb_cc, sc->tt.ddp_thres, uio->uio_resid); 896 } 897#endif 898 899 /* XXX: too eager to disable DDP, could handle NBIO better than this. */ 900 if (sb->sb_cc >= uio->uio_resid || uio->uio_resid < sc->tt.ddp_thres || 901 uio->uio_resid > MAX_DDP_BUFFER_SIZE || uio->uio_iovcnt > 1 || 902 so->so_state & SS_NBIO || flags & (MSG_DONTWAIT | MSG_NBIO) || 903 error || so->so_error || sb->sb_state & SBS_CANTRCVMORE) 904 goto no_ddp; 905 906 /* 907 * Fault in and then hold the pages of the uio buffers. We'll wire them 908 * a bit later if everything else works out. 909 */ 910 SOCKBUF_UNLOCK(sb); 911 if (hold_uio(uio, &pages, &npages) != 0) { 912 SOCKBUF_LOCK(sb); 913 goto no_ddp; 914 } 915 SOCKBUF_LOCK(sb); 916 if (__predict_false(so->so_error || sb->sb_state & SBS_CANTRCVMORE)) { 917 vm_page_unhold_pages(pages, npages); 918 free(pages, M_CXGBE); 919 goto no_ddp; 920 } 921 922 /* 923 * Figure out which one of the two DDP buffers to use this time. 924 */ 925 db_idx = select_ddp_buffer(sc, toep, pages, npages, 926 (uintptr_t)uio->uio_iov->iov_base & PAGE_MASK, uio->uio_resid); 927 pages = NULL; /* handed off to select_ddp_buffer */ 928 if (db_idx < 0) 929 goto no_ddp; 930 db = toep->db[db_idx]; 931 buf_flag = db_idx == 0 ? DDP_BUF0_ACTIVE : DDP_BUF1_ACTIVE; 932 933 /* 934 * Build the compound work request that tells the chip where to DMA the 935 * payload. 936 */ 937 ddp_flags = select_ddp_flags(so, flags, db_idx); 938 wr = mk_update_tcb_for_ddp(sc, toep, db_idx, sb->sb_cc, ddp_flags); 939 if (wr == NULL) { 940 /* 941 * Just unhold the pages. The DDP buffer's software state is 942 * left as-is in the toep. The page pods were written 943 * successfully and we may have an opportunity to use it in the 944 * future. 945 */ 946 vm_page_unhold_pages(db->pages, db->npages); 947 goto no_ddp; 948 } 949 950 /* Wire (and then unhold) the pages, and give the chip the go-ahead. */ 951 wire_ddp_buffer(db); 952 t4_wrq_tx(sc, wr); 953 sb->sb_flags &= ~SB_DDP_INDICATE; 954 toep->ddp_flags |= buf_flag; 955 956 /* 957 * Wait for the DDP operation to complete and then unwire the pages. 958 * The return code from the sbwait will be the final return code of this 959 * function. But we do need to wait for DDP no matter what. 960 */ 961 rc = sbwait(sb); 962 while (toep->ddp_flags & buf_flag) { 963 sb->sb_flags |= SB_WAIT; 964 msleep(&sb->sb_cc, &sb->sb_mtx, PSOCK , "sbwait", 0); 965 } 966 unwire_ddp_buffer(db); 967 return (rc); 968no_ddp: 969 disable_ddp(sc, toep); 970 discourage_ddp(toep); 971 sb->sb_flags &= ~SB_DDP_INDICATE; 972 return (0); 973} 974 975void 976t4_init_ddp(struct adapter *sc, struct tom_data *td) 977{ 978 int nppods = sc->vres.ddp.size / PPOD_SIZE; 979 980 td->nppods = nppods; 981 td->nppods_free = nppods; 982 td->nppods_free_head = nppods; 983 TAILQ_INIT(&td->ppods); 984 mtx_init(&td->ppod_lock, "page pods", NULL, MTX_DEF); 985 986 t4_register_cpl_handler(sc, CPL_RX_DATA_DDP, do_rx_data_ddp); 987 t4_register_cpl_handler(sc, CPL_RX_DDP_COMPLETE, do_rx_ddp_complete); 988} 989 990void 991t4_uninit_ddp(struct adapter *sc __unused, struct tom_data *td) 992{ 993 994 KASSERT(td->nppods == td->nppods_free, 995 ("%s: page pods still in use, nppods = %d, free = %d", 996 __func__, td->nppods, td->nppods_free)); 997 998 if (mtx_initialized(&td->ppod_lock)) 999 mtx_destroy(&td->ppod_lock); 1000} 1001 1002#define VNET_SO_ASSERT(so) \ 1003 VNET_ASSERT(curvnet != NULL, \ 1004 ("%s:%d curvnet is NULL, so=%p", __func__, __LINE__, (so))); 1005#define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? 0 : SBL_WAIT) 1006static int 1007soreceive_rcvoob(struct socket *so, struct uio *uio, int flags) 1008{ 1009 1010 CXGBE_UNIMPLEMENTED(__func__); 1011} 1012 1013static char ddp_magic_str[] = "nothing to see here"; 1014 1015struct mbuf * 1016get_ddp_mbuf(int len) 1017{ 1018 struct mbuf *m; 1019 1020 m = m_get(M_NOWAIT, MT_DATA); 1021 if (m == NULL) 1022 CXGBE_UNIMPLEMENTED("mbuf alloc failure"); 1023 m->m_len = len; 1024 m->m_data = &ddp_magic_str[0]; 1025 1026 return (m); 1027} 1028 1029static inline int 1030is_ddp_mbuf(struct mbuf *m) 1031{ 1032 1033 return (m->m_data == &ddp_magic_str[0]); 1034} 1035 1036/* 1037 * Copy an mbuf chain into a uio limited by len if set. 1038 */ 1039static int 1040m_mbuftouio_ddp(struct uio *uio, struct mbuf *m, int len) 1041{ 1042 int error, length, total; 1043 int progress = 0; 1044 1045 if (len > 0) 1046 total = min(uio->uio_resid, len); 1047 else 1048 total = uio->uio_resid; 1049 1050 /* Fill the uio with data from the mbufs. */ 1051 for (; m != NULL; m = m->m_next) { 1052 length = min(m->m_len, total - progress); 1053 1054 if (is_ddp_mbuf(m)) { 1055 enum uio_seg segflag = uio->uio_segflg; 1056 1057 uio->uio_segflg = UIO_NOCOPY; 1058 error = uiomove(mtod(m, void *), length, uio); 1059 uio->uio_segflg = segflag; 1060 } else 1061 error = uiomove(mtod(m, void *), length, uio); 1062 if (error) 1063 return (error); 1064 1065 progress += length; 1066 } 1067 1068 return (0); 1069} 1070 1071/* 1072 * Based on soreceive_stream() in uipc_socket.c 1073 */ 1074int 1075t4_soreceive_ddp(struct socket *so, struct sockaddr **psa, struct uio *uio, 1076 struct mbuf **mp0, struct mbuf **controlp, int *flagsp) 1077{ 1078 int len = 0, error = 0, flags, oresid, ddp_handled = 0; 1079 struct sockbuf *sb; 1080 struct mbuf *m, *n = NULL; 1081 1082 /* We only do stream sockets. */ 1083 if (so->so_type != SOCK_STREAM) 1084 return (EINVAL); 1085 if (psa != NULL) 1086 *psa = NULL; 1087 if (controlp != NULL) 1088 return (EINVAL); 1089 if (flagsp != NULL) 1090 flags = *flagsp &~ MSG_EOR; 1091 else 1092 flags = 0; 1093 if (flags & MSG_OOB) 1094 return (soreceive_rcvoob(so, uio, flags)); 1095 if (mp0 != NULL) 1096 *mp0 = NULL; 1097 1098 sb = &so->so_rcv; 1099 1100 /* Prevent other readers from entering the socket. */ 1101 error = sblock(sb, SBLOCKWAIT(flags)); 1102 if (error) 1103 goto out; 1104 SOCKBUF_LOCK(sb); 1105 1106 /* Easy one, no space to copyout anything. */ 1107 if (uio->uio_resid == 0) { 1108 error = EINVAL; 1109 goto out; 1110 } 1111 oresid = uio->uio_resid; 1112 1113 /* We will never ever get anything unless we are or were connected. */ 1114 if (!(so->so_state & (SS_ISCONNECTED|SS_ISDISCONNECTED))) { 1115 error = ENOTCONN; 1116 goto out; 1117 } 1118 1119restart: 1120 SOCKBUF_LOCK_ASSERT(&so->so_rcv); 1121 1122 if (sb->sb_flags & SB_DDP_INDICATE && !ddp_handled) { 1123 1124 /* uio should be just as it was at entry */ 1125 KASSERT(oresid == uio->uio_resid, 1126 ("%s: oresid = %d, uio_resid = %zd, sb_cc = %d", 1127 __func__, oresid, uio->uio_resid, sb->sb_cc)); 1128 1129 error = handle_ddp(so, uio, flags, 0); 1130 ddp_handled = 1; 1131 if (error) 1132 goto out; 1133 } 1134 1135 /* Abort if socket has reported problems. */ 1136 if (so->so_error) { 1137 if (sb->sb_cc > 0) 1138 goto deliver; 1139 if (oresid > uio->uio_resid) 1140 goto out; 1141 error = so->so_error; 1142 if (!(flags & MSG_PEEK)) 1143 so->so_error = 0; 1144 goto out; 1145 } 1146 1147 /* Door is closed. Deliver what is left, if any. */ 1148 if (sb->sb_state & SBS_CANTRCVMORE) { 1149 if (sb->sb_cc > 0) 1150 goto deliver; 1151 else 1152 goto out; 1153 } 1154 1155 /* Socket buffer is empty and we shall not block. */ 1156 if (sb->sb_cc == 0 && 1157 ((so->so_state & SS_NBIO) || (flags & (MSG_DONTWAIT|MSG_NBIO)))) { 1158 error = EAGAIN; 1159 goto out; 1160 } 1161 1162 /* Socket buffer got some data that we shall deliver now. */ 1163 if (sb->sb_cc > 0 && !(flags & MSG_WAITALL) && 1164 ((sb->sb_flags & SS_NBIO) || 1165 (flags & (MSG_DONTWAIT|MSG_NBIO)) || 1166 sb->sb_cc >= sb->sb_lowat || 1167 sb->sb_cc >= uio->uio_resid || 1168 sb->sb_cc >= sb->sb_hiwat) ) { 1169 goto deliver; 1170 } 1171 1172 /* On MSG_WAITALL we must wait until all data or error arrives. */ 1173 if ((flags & MSG_WAITALL) && 1174 (sb->sb_cc >= uio->uio_resid || sb->sb_cc >= sb->sb_lowat)) 1175 goto deliver; 1176 1177 /* 1178 * Wait and block until (more) data comes in. 1179 * NB: Drops the sockbuf lock during wait. 1180 */ 1181 error = sbwait(sb); 1182 if (error) { 1183 if (sb->sb_flags & SB_DDP_INDICATE && !ddp_handled) { 1184 (void) handle_ddp(so, uio, flags, 1); 1185 ddp_handled = 1; 1186 } 1187 goto out; 1188 } 1189 goto restart; 1190 1191deliver: 1192 SOCKBUF_LOCK_ASSERT(&so->so_rcv); 1193 KASSERT(sb->sb_cc > 0, ("%s: sockbuf empty", __func__)); 1194 KASSERT(sb->sb_mb != NULL, ("%s: sb_mb == NULL", __func__)); 1195 1196 if (sb->sb_flags & SB_DDP_INDICATE && !ddp_handled) 1197 goto restart; 1198 1199 /* Statistics. */ 1200 if (uio->uio_td) 1201 uio->uio_td->td_ru.ru_msgrcv++; 1202 1203 /* Fill uio until full or current end of socket buffer is reached. */ 1204 len = min(uio->uio_resid, sb->sb_cc); 1205 if (mp0 != NULL) { 1206 /* Dequeue as many mbufs as possible. */ 1207 if (!(flags & MSG_PEEK) && len >= sb->sb_mb->m_len) { 1208 for (*mp0 = m = sb->sb_mb; 1209 m != NULL && m->m_len <= len; 1210 m = m->m_next) { 1211 len -= m->m_len; 1212 uio->uio_resid -= m->m_len; 1213 sbfree(sb, m); 1214 n = m; 1215 } 1216 sb->sb_mb = m; 1217 if (sb->sb_mb == NULL) 1218 SB_EMPTY_FIXUP(sb); 1219 n->m_next = NULL; 1220 } 1221 /* Copy the remainder. */ 1222 if (len > 0) { 1223 KASSERT(sb->sb_mb != NULL, 1224 ("%s: len > 0 && sb->sb_mb empty", __func__)); 1225 1226 m = m_copym(sb->sb_mb, 0, len, M_NOWAIT); 1227 if (m == NULL) 1228 len = 0; /* Don't flush data from sockbuf. */ 1229 else 1230 uio->uio_resid -= m->m_len; 1231 if (*mp0 != NULL) 1232 n->m_next = m; 1233 else 1234 *mp0 = m; 1235 if (*mp0 == NULL) { 1236 error = ENOBUFS; 1237 goto out; 1238 } 1239 } 1240 } else { 1241 /* NB: Must unlock socket buffer as uiomove may sleep. */ 1242 SOCKBUF_UNLOCK(sb); 1243 error = m_mbuftouio_ddp(uio, sb->sb_mb, len); 1244 SOCKBUF_LOCK(sb); 1245 if (error) 1246 goto out; 1247 } 1248 SBLASTRECORDCHK(sb); 1249 SBLASTMBUFCHK(sb); 1250 1251 /* 1252 * Remove the delivered data from the socket buffer unless we 1253 * were only peeking. 1254 */ 1255 if (!(flags & MSG_PEEK)) { 1256 if (len > 0) 1257 sbdrop_locked(sb, len); 1258 1259 /* Notify protocol that we drained some data. */ 1260 if ((so->so_proto->pr_flags & PR_WANTRCVD) && 1261 (((flags & MSG_WAITALL) && uio->uio_resid > 0) || 1262 !(flags & MSG_SOCALLBCK))) { 1263 SOCKBUF_UNLOCK(sb); 1264 VNET_SO_ASSERT(so); 1265 (*so->so_proto->pr_usrreqs->pru_rcvd)(so, flags); 1266 SOCKBUF_LOCK(sb); 1267 } 1268 } 1269 1270 /* 1271 * For MSG_WAITALL we may have to loop again and wait for 1272 * more data to come in. 1273 */ 1274 if ((flags & MSG_WAITALL) && uio->uio_resid > 0) 1275 goto restart; 1276out: 1277 SOCKBUF_LOCK_ASSERT(sb); 1278 SBLASTRECORDCHK(sb); 1279 SBLASTMBUFCHK(sb); 1280 SOCKBUF_UNLOCK(sb); 1281 sbunlock(sb); 1282 return (error); 1283} 1284 1285#endif 1286