1 /*- 2 * Copyright (c) 2012 Chelsio Communications, Inc. 3 * All rights reserved. 4 * 5 * Chelsio T5xx iSCSI driver 6 * 7 * Written by: Sreenivasa Honnur <shonnur@chelsio.com> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 37 #include <sys/types.h> 38 #include <sys/param.h> 39 #include <sys/kernel.h> 40 #include <sys/ktr.h> 41 #include <sys/module.h> 42 #include <sys/systm.h> 43 44 #ifdef TCP_OFFLOAD 45 #include <sys/errno.h> 46 #include <sys/kthread.h> 47 #include <sys/smp.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/mbuf.h> 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <sys/condvar.h> 54 55 #include <netinet/in.h> 56 #include <netinet/in_pcb.h> 57 #include <netinet/toecore.h> 58 #include <netinet/tcp_var.h> 59 #include <netinet/tcp_fsm.h> 60 61 #include <cam/scsi/scsi_all.h> 62 #include <cam/scsi/scsi_da.h> 63 #include <cam/ctl/ctl_io.h> 64 #include <cam/ctl/ctl.h> 65 #include <cam/ctl/ctl_backend.h> 66 #include <cam/ctl/ctl_error.h> 67 #include <cam/ctl/ctl_frontend.h> 68 #include <cam/ctl/ctl_debug.h> 69 #include <cam/ctl/ctl_ha.h> 70 #include <cam/ctl/ctl_ioctl.h> 71 72 #include <dev/iscsi/icl.h> 73 #include <dev/iscsi/iscsi_proto.h> 74 #include <dev/iscsi/iscsi_ioctl.h> 75 #include <dev/iscsi/iscsi.h> 76 #include <cam/ctl/ctl_frontend_iscsi.h> 77 78 #include <cam/cam.h> 79 #include <cam/cam_ccb.h> 80 #include <cam/cam_xpt.h> 81 #include <cam/cam_debug.h> 82 #include <cam/cam_sim.h> 83 #include <cam/cam_xpt_sim.h> 84 #include <cam/cam_xpt_periph.h> 85 #include <cam/cam_periph.h> 86 #include <cam/cam_compat.h> 87 #include <cam/scsi/scsi_message.h> 88 89 #include "common/common.h" 90 #include "common/t4_msg.h" 91 #include "common/t4_regs.h" /* for PCIE_MEM_ACCESS */ 92 #include "tom/t4_tom.h" 93 #include "cxgbei.h" 94 95 static int worker_thread_count; 96 static struct cxgbei_worker_thread_softc *cwt_softc; 97 static struct proc *cxgbei_proc; 98 99 static void 100 read_pdu_limits(struct adapter *sc, uint32_t *max_tx_pdu_len, 101 uint32_t *max_rx_pdu_len) 102 { 103 uint32_t tx_len, rx_len, r, v; 104 105 rx_len = t4_read_reg(sc, A_TP_PMM_RX_PAGE_SIZE); 106 tx_len = t4_read_reg(sc, A_TP_PMM_TX_PAGE_SIZE); 107 108 r = t4_read_reg(sc, A_TP_PARA_REG2); 109 rx_len = min(rx_len, G_MAXRXDATA(r)); 110 tx_len = min(tx_len, G_MAXRXDATA(r)); 111 112 r = t4_read_reg(sc, A_TP_PARA_REG7); 113 v = min(G_PMMAXXFERLEN0(r), G_PMMAXXFERLEN1(r)); 114 rx_len = min(rx_len, v); 115 tx_len = min(tx_len, v); 116 117 *max_tx_pdu_len = rounddown2(tx_len, 512); 118 *max_rx_pdu_len = rounddown2(rx_len, 512); 119 } 120 121 /* 122 * Initialize the software state of the iSCSI ULP driver. 123 * 124 * ENXIO means firmware didn't set up something that it was supposed to. 125 */ 126 static int 127 cxgbei_init(struct adapter *sc, struct cxgbei_data *ci) 128 { 129 struct sysctl_oid *oid; 130 struct sysctl_oid_list *children; 131 struct ppod_region *pr; 132 uint32_t r; 133 int rc; 134 135 MPASS(sc->vres.iscsi.size > 0); 136 MPASS(ci != NULL); 137 138 read_pdu_limits(sc, &ci->max_tx_pdu_len, &ci->max_rx_pdu_len); 139 140 pr = &ci->pr; 141 r = t4_read_reg(sc, A_ULP_RX_ISCSI_PSZ); 142 rc = t4_init_ppod_region(pr, &sc->vres.iscsi, r, "iSCSI page pods"); 143 if (rc != 0) { 144 device_printf(sc->dev, 145 "%s: failed to initialize the iSCSI page pod region: %u.\n", 146 __func__, rc); 147 return (rc); 148 } 149 150 r = t4_read_reg(sc, A_ULP_RX_ISCSI_TAGMASK); 151 r &= V_ISCSITAGMASK(M_ISCSITAGMASK); 152 if (r != pr->pr_tag_mask) { 153 /* 154 * Recent firmwares are supposed to set up the iSCSI tagmask 155 * but we'll do it ourselves it the computed value doesn't match 156 * what's in the register. 157 */ 158 device_printf(sc->dev, 159 "tagmask 0x%08x does not match computed mask 0x%08x.\n", r, 160 pr->pr_tag_mask); 161 t4_set_reg_field(sc, A_ULP_RX_ISCSI_TAGMASK, 162 V_ISCSITAGMASK(M_ISCSITAGMASK), pr->pr_tag_mask); 163 } 164 165 sysctl_ctx_init(&ci->ctx); 166 oid = device_get_sysctl_tree(sc->dev); /* dev.t5nex.X */ 167 children = SYSCTL_CHILDREN(oid); 168 169 oid = SYSCTL_ADD_NODE(&ci->ctx, children, OID_AUTO, "iscsi", 170 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "iSCSI ULP settings"); 171 children = SYSCTL_CHILDREN(oid); 172 173 ci->ddp_threshold = 2048; 174 SYSCTL_ADD_UINT(&ci->ctx, children, OID_AUTO, "ddp_threshold", 175 CTLFLAG_RW, &ci->ddp_threshold, 0, "Rx zero copy threshold"); 176 177 return (0); 178 } 179 180 static int 181 do_rx_iscsi_hdr(struct sge_iq *iq, const struct rss_header *rss, struct mbuf *m) 182 { 183 struct adapter *sc = iq->adapter; 184 struct cpl_iscsi_hdr *cpl = mtod(m, struct cpl_iscsi_hdr *); 185 u_int tid = GET_TID(cpl); 186 struct toepcb *toep = lookup_tid(sc, tid); 187 struct icl_pdu *ip; 188 struct icl_cxgbei_pdu *icp; 189 uint16_t len_ddp = be16toh(cpl->pdu_len_ddp); 190 uint16_t len = be16toh(cpl->len); 191 192 M_ASSERTPKTHDR(m); 193 MPASS(m->m_pkthdr.len == len + sizeof(*cpl)); 194 195 ip = icl_cxgbei_new_pdu(M_NOWAIT); 196 if (ip == NULL) 197 CXGBE_UNIMPLEMENTED("PDU allocation failure"); 198 m_copydata(m, sizeof(*cpl), ISCSI_BHS_SIZE, (caddr_t)ip->ip_bhs); 199 ip->ip_data_len = G_ISCSI_PDU_LEN(len_ddp) - len; 200 icp = ip_to_icp(ip); 201 icp->icp_seq = ntohl(cpl->seq); 202 icp->icp_flags = ICPF_RX_HDR; 203 204 /* This is the start of a new PDU. There should be no old state. */ 205 MPASS(toep->ulpcb2 == NULL); 206 toep->ulpcb2 = icp; 207 208 #if 0 209 CTR5(KTR_CXGBE, "%s: tid %u, cpl->len %u, pdu_len_ddp 0x%04x, icp %p", 210 __func__, tid, len, len_ddp, icp); 211 #endif 212 213 m_freem(m); 214 return (0); 215 } 216 217 static int 218 do_rx_iscsi_data(struct sge_iq *iq, const struct rss_header *rss, struct mbuf *m) 219 { 220 struct adapter *sc = iq->adapter; 221 struct cpl_iscsi_data *cpl = mtod(m, struct cpl_iscsi_data *); 222 u_int tid = GET_TID(cpl); 223 struct toepcb *toep = lookup_tid(sc, tid); 224 struct icl_cxgbei_pdu *icp = toep->ulpcb2; 225 struct icl_pdu *ip; 226 227 M_ASSERTPKTHDR(m); 228 MPASS(m->m_pkthdr.len == be16toh(cpl->len) + sizeof(*cpl)); 229 230 if (icp == NULL) { 231 /* 232 * T6 completion enabled, start of a new pdu. Header 233 * will come in completion CPL. 234 */ 235 ip = icl_cxgbei_new_pdu(M_NOWAIT); 236 if (ip == NULL) 237 CXGBE_UNIMPLEMENTED("PDU allocation failure"); 238 icp = ip_to_icp(ip); 239 } else { 240 /* T5 mode, header is already received. */ 241 MPASS(icp->icp_flags == ICPF_RX_HDR); 242 MPASS(icp->ip.ip_data_mbuf == NULL); 243 MPASS(icp->ip.ip_data_len == m->m_pkthdr.len - sizeof(*cpl)); 244 } 245 246 /* Trim the cpl header from mbuf. */ 247 m_adj(m, sizeof(*cpl)); 248 249 icp->icp_flags |= ICPF_RX_FLBUF; 250 icp->ip.ip_data_mbuf = m; 251 toep->ofld_rxq->rx_iscsi_fl_pdus++; 252 toep->ofld_rxq->rx_iscsi_fl_octets += m->m_pkthdr.len; 253 254 /* 255 * For T6, save the icp for further processing in the 256 * completion handler. 257 */ 258 if (icp->icp_flags == ICPF_RX_FLBUF) { 259 MPASS(toep->ulpcb2 == NULL); 260 toep->ulpcb2 = icp; 261 } 262 263 #if 0 264 CTR4(KTR_CXGBE, "%s: tid %u, cpl->len %u, icp %p", __func__, tid, 265 be16toh(cpl->len), icp); 266 #endif 267 268 return (0); 269 } 270 271 static int 272 do_rx_iscsi_ddp(struct sge_iq *iq, const struct rss_header *rss, struct mbuf *m) 273 { 274 struct adapter *sc = iq->adapter; 275 const struct cpl_rx_data_ddp *cpl = (const void *)(rss + 1); 276 u_int tid = GET_TID(cpl); 277 struct toepcb *toep = lookup_tid(sc, tid); 278 struct inpcb *inp = toep->inp; 279 struct socket *so; 280 struct sockbuf *sb; 281 struct tcpcb *tp; 282 struct icl_cxgbei_conn *icc; 283 struct icl_conn *ic; 284 struct icl_cxgbei_pdu *icp = toep->ulpcb2; 285 struct icl_pdu *ip; 286 u_int pdu_len, val; 287 struct epoch_tracker et; 288 289 MPASS(m == NULL); 290 291 /* Must already be assembling a PDU. */ 292 MPASS(icp != NULL); 293 MPASS(icp->icp_flags & ICPF_RX_HDR); /* Data is optional. */ 294 MPASS((icp->icp_flags & ICPF_RX_STATUS) == 0); 295 296 pdu_len = be16toh(cpl->len); /* includes everything. */ 297 val = be32toh(cpl->ddpvld); 298 299 #if 0 300 CTR5(KTR_CXGBE, 301 "%s: tid %u, cpl->len %u, ddpvld 0x%08x, icp_flags 0x%08x", 302 __func__, tid, pdu_len, val, icp->icp_flags); 303 #endif 304 305 icp->icp_flags |= ICPF_RX_STATUS; 306 ip = &icp->ip; 307 if (val & F_DDP_PADDING_ERR) 308 icp->icp_flags |= ICPF_PAD_ERR; 309 if (val & F_DDP_HDRCRC_ERR) 310 icp->icp_flags |= ICPF_HCRC_ERR; 311 if (val & F_DDP_DATACRC_ERR) 312 icp->icp_flags |= ICPF_DCRC_ERR; 313 if (val & F_DDP_PDU && ip->ip_data_mbuf == NULL) { 314 MPASS((icp->icp_flags & ICPF_RX_FLBUF) == 0); 315 MPASS(ip->ip_data_len > 0); 316 icp->icp_flags |= ICPF_RX_DDP; 317 toep->ofld_rxq->rx_iscsi_ddp_pdus++; 318 toep->ofld_rxq->rx_iscsi_ddp_octets += ip->ip_data_len; 319 } 320 321 INP_WLOCK(inp); 322 if (__predict_false(inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT))) { 323 CTR4(KTR_CXGBE, "%s: tid %u, rx (%d bytes), inp_flags 0x%x", 324 __func__, tid, pdu_len, inp->inp_flags); 325 INP_WUNLOCK(inp); 326 icl_cxgbei_conn_pdu_free(NULL, ip); 327 toep->ulpcb2 = NULL; 328 return (0); 329 } 330 331 /* 332 * T6+ does not report data PDUs received via DDP without F 333 * set. This can result in gaps in the TCP sequence space. 334 */ 335 tp = intotcpcb(inp); 336 MPASS(chip_id(sc) >= CHELSIO_T6 || icp->icp_seq == tp->rcv_nxt); 337 tp->rcv_nxt = icp->icp_seq + pdu_len; 338 tp->t_rcvtime = ticks; 339 340 /* 341 * Don't update the window size or return credits since RX 342 * flow control is disabled. 343 */ 344 345 so = inp->inp_socket; 346 sb = &so->so_rcv; 347 SOCKBUF_LOCK(sb); 348 349 icc = toep->ulpcb; 350 if (__predict_false(icc == NULL || sb->sb_state & SBS_CANTRCVMORE)) { 351 CTR5(KTR_CXGBE, 352 "%s: tid %u, excess rx (%d bytes), icc %p, sb_state 0x%x", 353 __func__, tid, pdu_len, icc, sb->sb_state); 354 SOCKBUF_UNLOCK(sb); 355 INP_WUNLOCK(inp); 356 357 CURVNET_SET(so->so_vnet); 358 NET_EPOCH_ENTER(et); 359 INP_WLOCK(inp); 360 tp = tcp_drop(tp, ECONNRESET); 361 if (tp) 362 INP_WUNLOCK(inp); 363 NET_EPOCH_EXIT(et); 364 CURVNET_RESTORE(); 365 366 icl_cxgbei_conn_pdu_free(NULL, ip); 367 toep->ulpcb2 = NULL; 368 return (0); 369 } 370 MPASS(icc->icc_signature == CXGBEI_CONN_SIGNATURE); 371 ic = &icc->ic; 372 icl_cxgbei_new_pdu_set_conn(ip, ic); 373 374 MPASS(m == NULL); /* was unused, we'll use it now. */ 375 m = sbcut_locked(sb, sbused(sb)); /* XXXNP: toep->sb_cc accounting? */ 376 if (__predict_false(m != NULL)) { 377 int len = m_length(m, NULL); 378 379 /* 380 * PDUs were received before the tid transitioned to ULP mode. 381 * Convert them to icl_cxgbei_pdus and send them to ICL before 382 * the PDU in icp/ip. 383 */ 384 CTR3(KTR_CXGBE, "%s: tid %u, %u bytes in so_rcv", __func__, tid, 385 len); 386 387 /* XXXNP: needs to be rewritten. */ 388 if (len == sizeof(struct iscsi_bhs) || len == 4 + sizeof(struct 389 iscsi_bhs)) { 390 struct icl_cxgbei_pdu *icp0; 391 struct icl_pdu *ip0; 392 393 ip0 = icl_cxgbei_new_pdu(M_NOWAIT); 394 if (ip0 == NULL) 395 CXGBE_UNIMPLEMENTED("PDU allocation failure"); 396 icl_cxgbei_new_pdu_set_conn(ip0, ic); 397 icp0 = ip_to_icp(ip0); 398 icp0->icp_seq = 0; /* XXX */ 399 icp0->icp_flags = ICPF_RX_HDR | ICPF_RX_STATUS; 400 m_copydata(m, 0, sizeof(struct iscsi_bhs), (void *)ip0->ip_bhs); 401 STAILQ_INSERT_TAIL(&icc->rcvd_pdus, ip0, ip_next); 402 } 403 m_freem(m); 404 } 405 406 STAILQ_INSERT_TAIL(&icc->rcvd_pdus, ip, ip_next); 407 if ((icc->rx_flags & RXF_ACTIVE) == 0) { 408 struct cxgbei_worker_thread_softc *cwt = &cwt_softc[icc->cwt]; 409 410 mtx_lock(&cwt->cwt_lock); 411 icc->rx_flags |= RXF_ACTIVE; 412 TAILQ_INSERT_TAIL(&cwt->rx_head, icc, rx_link); 413 if (cwt->cwt_state == CWT_SLEEPING) { 414 cwt->cwt_state = CWT_RUNNING; 415 cv_signal(&cwt->cwt_cv); 416 } 417 mtx_unlock(&cwt->cwt_lock); 418 } 419 SOCKBUF_UNLOCK(sb); 420 INP_WUNLOCK(inp); 421 422 toep->ulpcb2 = NULL; 423 424 return (0); 425 } 426 427 static int 428 do_rx_iscsi_cmp(struct sge_iq *iq, const struct rss_header *rss, struct mbuf *m) 429 { 430 struct epoch_tracker et; 431 struct adapter *sc = iq->adapter; 432 struct cpl_rx_iscsi_cmp *cpl = mtod(m, struct cpl_rx_iscsi_cmp *); 433 u_int tid = GET_TID(cpl); 434 struct toepcb *toep = lookup_tid(sc, tid); 435 struct icl_cxgbei_pdu *icp = toep->ulpcb2; 436 struct icl_pdu *ip; 437 struct cxgbei_cmp *cmp; 438 struct inpcb *inp = toep->inp; 439 #ifdef INVARIANTS 440 uint16_t len = be16toh(cpl->len); 441 #endif 442 struct socket *so; 443 struct sockbuf *sb; 444 struct tcpcb *tp; 445 struct icl_cxgbei_conn *icc; 446 struct icl_conn *ic; 447 struct iscsi_bhs_data_out *bhsdo; 448 u_int val = be32toh(cpl->ddpvld); 449 u_int npdus, pdu_len, data_digest_len, hdr_digest_len; 450 uint32_t prev_seg_len; 451 452 M_ASSERTPKTHDR(m); 453 MPASS(m->m_pkthdr.len == len + sizeof(*cpl)); 454 455 if ((val & F_DDP_PDU) == 0) { 456 MPASS(icp != NULL); 457 MPASS((icp->icp_flags & ICPF_RX_STATUS) == 0); 458 ip = &icp->ip; 459 } 460 461 if (icp == NULL) { 462 /* T6 completion enabled, start of a new PDU. */ 463 ip = icl_cxgbei_new_pdu(M_NOWAIT); 464 if (ip == NULL) 465 CXGBE_UNIMPLEMENTED("PDU allocation failure"); 466 icp = ip_to_icp(ip); 467 } 468 pdu_len = G_ISCSI_PDU_LEN(be16toh(cpl->pdu_len_ddp)); 469 470 #if 0 471 CTR5(KTR_CXGBE, 472 "%s: tid %u, cpl->len %u, ddpvld 0x%08x, icp %p", 473 __func__, tid, pdu_len, val, icp); 474 #endif 475 476 /* Copy header */ 477 m_copydata(m, sizeof(*cpl), ISCSI_BHS_SIZE, (caddr_t)ip->ip_bhs); 478 bhsdo = (struct iscsi_bhs_data_out *)ip->ip_bhs; 479 ip->ip_data_len = bhsdo->bhsdo_data_segment_len[0] << 16 | 480 bhsdo->bhsdo_data_segment_len[1] << 8 | 481 bhsdo->bhsdo_data_segment_len[2]; 482 icp->icp_seq = ntohl(cpl->seq); 483 icp->icp_flags |= ICPF_RX_HDR; 484 icp->icp_flags |= ICPF_RX_STATUS; 485 486 if (val & F_DDP_PADDING_ERR) 487 icp->icp_flags |= ICPF_PAD_ERR; 488 if (val & F_DDP_HDRCRC_ERR) 489 icp->icp_flags |= ICPF_HCRC_ERR; 490 if (val & F_DDP_DATACRC_ERR) 491 icp->icp_flags |= ICPF_DCRC_ERR; 492 493 INP_WLOCK(inp); 494 if (__predict_false(inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT))) { 495 CTR4(KTR_CXGBE, "%s: tid %u, rx (%d bytes), inp_flags 0x%x", 496 __func__, tid, pdu_len, inp->inp_flags); 497 INP_WUNLOCK(inp); 498 icl_cxgbei_conn_pdu_free(NULL, ip); 499 toep->ulpcb2 = NULL; 500 m_freem(m); 501 return (0); 502 } 503 504 tp = intotcpcb(inp); 505 506 /* 507 * If icc is NULL, the connection is being closed in 508 * icl_cxgbei_conn_close(), just drop this data. 509 */ 510 icc = toep->ulpcb; 511 if (__predict_false(icc == NULL)) { 512 CTR4(KTR_CXGBE, "%s: tid %u, excess rx (%d bytes), icc %p", 513 __func__, tid, pdu_len, icc); 514 515 /* 516 * Update rcv_nxt so the sequence number of the FIN 517 * doesn't appear wrong. 518 */ 519 tp->rcv_nxt = icp->icp_seq + pdu_len; 520 tp->t_rcvtime = ticks; 521 INP_WUNLOCK(inp); 522 523 icl_cxgbei_conn_pdu_free(NULL, ip); 524 toep->ulpcb2 = NULL; 525 m_freem(m); 526 return (0); 527 } 528 529 data_digest_len = (icc->ulp_submode & ULP_CRC_DATA) ? 530 ISCSI_DATA_DIGEST_SIZE : 0; 531 hdr_digest_len = (icc->ulp_submode & ULP_CRC_HEADER) ? 532 ISCSI_HEADER_DIGEST_SIZE : 0; 533 MPASS(roundup2(ip->ip_data_len, 4) == pdu_len - len - data_digest_len); 534 535 if (val & F_DDP_PDU && ip->ip_data_mbuf == NULL) { 536 MPASS((icp->icp_flags & ICPF_RX_FLBUF) == 0); 537 MPASS(ip->ip_data_len > 0); 538 icp->icp_flags |= ICPF_RX_DDP; 539 bhsdo = (struct iscsi_bhs_data_out *)ip->ip_bhs; 540 541 switch (ip->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) { 542 case ISCSI_BHS_OPCODE_SCSI_DATA_IN: 543 cmp = cxgbei_find_cmp(icc, 544 be32toh(bhsdo->bhsdo_initiator_task_tag)); 545 break; 546 case ISCSI_BHS_OPCODE_SCSI_DATA_OUT: 547 cmp = cxgbei_find_cmp(icc, 548 be32toh(bhsdo->bhsdo_target_transfer_tag)); 549 break; 550 default: 551 __assert_unreachable(); 552 } 553 MPASS(cmp != NULL); 554 555 /* 556 * The difference between the end of the last burst 557 * and the offset of the last PDU in this burst is 558 * the additional data received via DDP. 559 */ 560 prev_seg_len = be32toh(bhsdo->bhsdo_buffer_offset) - 561 cmp->next_buffer_offset; 562 563 if (prev_seg_len != 0) { 564 /* 565 * Since cfiscsi doesn't know about previous 566 * headers, pretend that the entire r2t data 567 * length was received in this single segment. 568 */ 569 ip->ip_data_len += prev_seg_len; 570 bhsdo->bhsdo_data_segment_len[2] = ip->ip_data_len; 571 bhsdo->bhsdo_data_segment_len[1] = ip->ip_data_len >> 8; 572 bhsdo->bhsdo_data_segment_len[0] = ip->ip_data_len >> 16; 573 bhsdo->bhsdo_buffer_offset = 574 htobe32(cmp->next_buffer_offset); 575 576 npdus = htobe32(bhsdo->bhsdo_datasn) - cmp->last_datasn; 577 } else { 578 MPASS(htobe32(bhsdo->bhsdo_datasn) == 579 cmp->last_datasn + 1); 580 npdus = 1; 581 } 582 583 cmp->next_buffer_offset += ip->ip_data_len; 584 cmp->last_datasn = htobe32(bhsdo->bhsdo_datasn); 585 bhsdo->bhsdo_datasn = htobe32(cmp->next_datasn); 586 cmp->next_datasn++; 587 toep->ofld_rxq->rx_iscsi_ddp_pdus += npdus; 588 toep->ofld_rxq->rx_iscsi_ddp_octets += ip->ip_data_len; 589 } else { 590 MPASS(icp->icp_flags & (ICPF_RX_FLBUF)); 591 MPASS(ip->ip_data_len == ip->ip_data_mbuf->m_pkthdr.len); 592 } 593 594 tp->rcv_nxt = icp->icp_seq + pdu_len; 595 tp->t_rcvtime = ticks; 596 597 /* 598 * Don't update the window size or return credits since RX 599 * flow control is disabled. 600 */ 601 602 so = inp->inp_socket; 603 sb = &so->so_rcv; 604 SOCKBUF_LOCK(sb); 605 if (__predict_false(sb->sb_state & SBS_CANTRCVMORE)) { 606 CTR5(KTR_CXGBE, 607 "%s: tid %u, excess rx (%d bytes), icc %p, sb_state 0x%x", 608 __func__, tid, pdu_len, icc, sb->sb_state); 609 SOCKBUF_UNLOCK(sb); 610 INP_WUNLOCK(inp); 611 612 CURVNET_SET(so->so_vnet); 613 NET_EPOCH_ENTER(et); 614 INP_WLOCK(inp); 615 tp = tcp_drop(tp, ECONNRESET); 616 if (tp != NULL) 617 INP_WUNLOCK(inp); 618 NET_EPOCH_EXIT(et); 619 CURVNET_RESTORE(); 620 621 icl_cxgbei_conn_pdu_free(NULL, ip); 622 toep->ulpcb2 = NULL; 623 m_freem(m); 624 return (0); 625 } 626 MPASS(icc->icc_signature == CXGBEI_CONN_SIGNATURE); 627 ic = &icc->ic; 628 icl_cxgbei_new_pdu_set_conn(ip, ic); 629 630 /* Enqueue the PDU to the received pdus queue. */ 631 STAILQ_INSERT_TAIL(&icc->rcvd_pdus, ip, ip_next); 632 if ((icc->rx_flags & RXF_ACTIVE) == 0) { 633 struct cxgbei_worker_thread_softc *cwt = &cwt_softc[icc->cwt]; 634 635 mtx_lock(&cwt->cwt_lock); 636 icc->rx_flags |= RXF_ACTIVE; 637 TAILQ_INSERT_TAIL(&cwt->rx_head, icc, rx_link); 638 if (cwt->cwt_state == CWT_SLEEPING) { 639 cwt->cwt_state = CWT_RUNNING; 640 cv_signal(&cwt->cwt_cv); 641 } 642 mtx_unlock(&cwt->cwt_lock); 643 } 644 SOCKBUF_UNLOCK(sb); 645 INP_WUNLOCK(inp); 646 647 toep->ulpcb2 = NULL; 648 m_freem(m); 649 650 return (0); 651 } 652 653 static int 654 cxgbei_activate(struct adapter *sc) 655 { 656 struct cxgbei_data *ci; 657 int rc; 658 659 ASSERT_SYNCHRONIZED_OP(sc); 660 661 if (uld_active(sc, ULD_ISCSI)) { 662 KASSERT(0, ("%s: iSCSI offload already enabled on adapter %p", 663 __func__, sc)); 664 return (0); 665 } 666 667 if (sc->iscsicaps == 0 || sc->vres.iscsi.size == 0) { 668 device_printf(sc->dev, 669 "not iSCSI offload capable, or capability disabled.\n"); 670 return (ENOSYS); 671 } 672 673 /* per-adapter softc for iSCSI */ 674 ci = malloc(sizeof(*ci), M_CXGBE, M_ZERO | M_WAITOK); 675 if (ci == NULL) 676 return (ENOMEM); 677 678 rc = cxgbei_init(sc, ci); 679 if (rc != 0) { 680 free(ci, M_CXGBE); 681 return (rc); 682 } 683 684 sc->iscsi_ulp_softc = ci; 685 686 return (0); 687 } 688 689 static int 690 cxgbei_deactivate(struct adapter *sc) 691 { 692 struct cxgbei_data *ci = sc->iscsi_ulp_softc; 693 694 ASSERT_SYNCHRONIZED_OP(sc); 695 696 if (ci != NULL) { 697 sysctl_ctx_free(&ci->ctx); 698 t4_free_ppod_region(&ci->pr); 699 free(ci, M_CXGBE); 700 sc->iscsi_ulp_softc = NULL; 701 } 702 703 return (0); 704 } 705 706 static void 707 cxgbei_activate_all(struct adapter *sc, void *arg __unused) 708 { 709 710 if (begin_synchronized_op(sc, NULL, SLEEP_OK | INTR_OK, "t4isact") != 0) 711 return; 712 713 /* Activate iSCSI if any port on this adapter has IFCAP_TOE enabled. */ 714 if (sc->offload_map && !uld_active(sc, ULD_ISCSI)) 715 (void) t4_activate_uld(sc, ULD_ISCSI); 716 717 end_synchronized_op(sc, 0); 718 } 719 720 static void 721 cxgbei_deactivate_all(struct adapter *sc, void *arg __unused) 722 { 723 724 if (begin_synchronized_op(sc, NULL, SLEEP_OK | INTR_OK, "t4isdea") != 0) 725 return; 726 727 if (uld_active(sc, ULD_ISCSI)) 728 (void) t4_deactivate_uld(sc, ULD_ISCSI); 729 730 end_synchronized_op(sc, 0); 731 } 732 733 static struct uld_info cxgbei_uld_info = { 734 .uld_id = ULD_ISCSI, 735 .activate = cxgbei_activate, 736 .deactivate = cxgbei_deactivate, 737 }; 738 739 static void 740 cwt_main(void *arg) 741 { 742 struct cxgbei_worker_thread_softc *cwt = arg; 743 struct icl_cxgbei_conn *icc = NULL; 744 struct icl_conn *ic; 745 struct icl_pdu *ip; 746 struct sockbuf *sb; 747 STAILQ_HEAD(, icl_pdu) rx_pdus = STAILQ_HEAD_INITIALIZER(rx_pdus); 748 749 MPASS(cwt != NULL); 750 751 mtx_lock(&cwt->cwt_lock); 752 MPASS(cwt->cwt_state == 0); 753 cwt->cwt_state = CWT_RUNNING; 754 cv_signal(&cwt->cwt_cv); 755 756 while (__predict_true(cwt->cwt_state != CWT_STOP)) { 757 cwt->cwt_state = CWT_RUNNING; 758 while ((icc = TAILQ_FIRST(&cwt->rx_head)) != NULL) { 759 TAILQ_REMOVE(&cwt->rx_head, icc, rx_link); 760 mtx_unlock(&cwt->cwt_lock); 761 762 ic = &icc->ic; 763 sb = &ic->ic_socket->so_rcv; 764 765 SOCKBUF_LOCK(sb); 766 MPASS(icc->rx_flags & RXF_ACTIVE); 767 if (__predict_true(!(sb->sb_state & SBS_CANTRCVMORE))) { 768 MPASS(STAILQ_EMPTY(&rx_pdus)); 769 STAILQ_SWAP(&icc->rcvd_pdus, &rx_pdus, icl_pdu); 770 SOCKBUF_UNLOCK(sb); 771 772 /* Hand over PDUs to ICL. */ 773 while ((ip = STAILQ_FIRST(&rx_pdus)) != NULL) { 774 STAILQ_REMOVE_HEAD(&rx_pdus, ip_next); 775 ic->ic_receive(ip); 776 } 777 778 SOCKBUF_LOCK(sb); 779 MPASS(STAILQ_EMPTY(&rx_pdus)); 780 } 781 MPASS(icc->rx_flags & RXF_ACTIVE); 782 if (STAILQ_EMPTY(&icc->rcvd_pdus) || 783 __predict_false(sb->sb_state & SBS_CANTRCVMORE)) { 784 icc->rx_flags &= ~RXF_ACTIVE; 785 } else { 786 /* 787 * More PDUs were received while we were busy 788 * handing over the previous batch to ICL. 789 * Re-add this connection to the end of the 790 * queue. 791 */ 792 mtx_lock(&cwt->cwt_lock); 793 TAILQ_INSERT_TAIL(&cwt->rx_head, icc, 794 rx_link); 795 mtx_unlock(&cwt->cwt_lock); 796 } 797 SOCKBUF_UNLOCK(sb); 798 799 mtx_lock(&cwt->cwt_lock); 800 } 801 802 /* Inner loop doesn't check for CWT_STOP, do that first. */ 803 if (__predict_false(cwt->cwt_state == CWT_STOP)) 804 break; 805 cwt->cwt_state = CWT_SLEEPING; 806 cv_wait(&cwt->cwt_cv, &cwt->cwt_lock); 807 } 808 809 MPASS(TAILQ_FIRST(&cwt->rx_head) == NULL); 810 mtx_assert(&cwt->cwt_lock, MA_OWNED); 811 cwt->cwt_state = CWT_STOPPED; 812 cv_signal(&cwt->cwt_cv); 813 mtx_unlock(&cwt->cwt_lock); 814 kthread_exit(); 815 } 816 817 static int 818 start_worker_threads(void) 819 { 820 int i, rc; 821 struct cxgbei_worker_thread_softc *cwt; 822 823 worker_thread_count = min(mp_ncpus, 32); 824 cwt_softc = malloc(worker_thread_count * sizeof(*cwt), M_CXGBE, 825 M_WAITOK | M_ZERO); 826 827 MPASS(cxgbei_proc == NULL); 828 for (i = 0, cwt = &cwt_softc[0]; i < worker_thread_count; i++, cwt++) { 829 mtx_init(&cwt->cwt_lock, "cwt lock", NULL, MTX_DEF); 830 cv_init(&cwt->cwt_cv, "cwt cv"); 831 TAILQ_INIT(&cwt->rx_head); 832 rc = kproc_kthread_add(cwt_main, cwt, &cxgbei_proc, NULL, 0, 0, 833 "cxgbei", "%d", i); 834 if (rc != 0) { 835 printf("cxgbei: failed to start thread #%d/%d (%d)\n", 836 i + 1, worker_thread_count, rc); 837 mtx_destroy(&cwt->cwt_lock); 838 cv_destroy(&cwt->cwt_cv); 839 bzero(cwt, sizeof(*cwt)); 840 if (i == 0) { 841 free(cwt_softc, M_CXGBE); 842 worker_thread_count = 0; 843 844 return (rc); 845 } 846 847 /* Not fatal, carry on with fewer threads. */ 848 worker_thread_count = i; 849 rc = 0; 850 break; 851 } 852 853 /* Wait for thread to start before moving on to the next one. */ 854 mtx_lock(&cwt->cwt_lock); 855 while (cwt->cwt_state == 0) 856 cv_wait(&cwt->cwt_cv, &cwt->cwt_lock); 857 mtx_unlock(&cwt->cwt_lock); 858 } 859 860 MPASS(cwt_softc != NULL); 861 MPASS(worker_thread_count > 0); 862 return (0); 863 } 864 865 static void 866 stop_worker_threads(void) 867 { 868 int i; 869 struct cxgbei_worker_thread_softc *cwt = &cwt_softc[0]; 870 871 MPASS(worker_thread_count >= 0); 872 873 for (i = 0, cwt = &cwt_softc[0]; i < worker_thread_count; i++, cwt++) { 874 mtx_lock(&cwt->cwt_lock); 875 MPASS(cwt->cwt_state == CWT_RUNNING || 876 cwt->cwt_state == CWT_SLEEPING); 877 cwt->cwt_state = CWT_STOP; 878 cv_signal(&cwt->cwt_cv); 879 do { 880 cv_wait(&cwt->cwt_cv, &cwt->cwt_lock); 881 } while (cwt->cwt_state != CWT_STOPPED); 882 mtx_unlock(&cwt->cwt_lock); 883 mtx_destroy(&cwt->cwt_lock); 884 cv_destroy(&cwt->cwt_cv); 885 } 886 free(cwt_softc, M_CXGBE); 887 } 888 889 /* Select a worker thread for a connection. */ 890 u_int 891 cxgbei_select_worker_thread(struct icl_cxgbei_conn *icc) 892 { 893 struct adapter *sc = icc->sc; 894 struct toepcb *toep = icc->toep; 895 u_int i, n; 896 897 n = worker_thread_count / sc->sge.nofldrxq; 898 if (n > 0) 899 i = toep->vi->pi->port_id * n + arc4random() % n; 900 else 901 i = arc4random() % worker_thread_count; 902 903 CTR3(KTR_CXGBE, "%s: tid %u, cwt %u", __func__, toep->tid, i); 904 905 return (i); 906 } 907 908 static int 909 cxgbei_mod_load(void) 910 { 911 int rc; 912 913 t4_register_cpl_handler(CPL_ISCSI_HDR, do_rx_iscsi_hdr); 914 t4_register_cpl_handler(CPL_ISCSI_DATA, do_rx_iscsi_data); 915 t4_register_cpl_handler(CPL_RX_ISCSI_DDP, do_rx_iscsi_ddp); 916 t4_register_cpl_handler(CPL_RX_ISCSI_CMP, do_rx_iscsi_cmp); 917 918 rc = start_worker_threads(); 919 if (rc != 0) 920 return (rc); 921 922 rc = t4_register_uld(&cxgbei_uld_info); 923 if (rc != 0) { 924 stop_worker_threads(); 925 return (rc); 926 } 927 928 t4_iterate(cxgbei_activate_all, NULL); 929 930 return (rc); 931 } 932 933 static int 934 cxgbei_mod_unload(void) 935 { 936 937 t4_iterate(cxgbei_deactivate_all, NULL); 938 939 if (t4_unregister_uld(&cxgbei_uld_info) == EBUSY) 940 return (EBUSY); 941 942 stop_worker_threads(); 943 944 t4_register_cpl_handler(CPL_ISCSI_HDR, NULL); 945 t4_register_cpl_handler(CPL_ISCSI_DATA, NULL); 946 t4_register_cpl_handler(CPL_RX_ISCSI_DDP, NULL); 947 t4_register_cpl_handler(CPL_RX_ISCSI_CMP, NULL); 948 949 return (0); 950 } 951 #endif 952 953 static int 954 cxgbei_modevent(module_t mod, int cmd, void *arg) 955 { 956 int rc = 0; 957 958 #ifdef TCP_OFFLOAD 959 switch (cmd) { 960 case MOD_LOAD: 961 rc = cxgbei_mod_load(); 962 if (rc == 0) 963 rc = icl_cxgbei_mod_load(); 964 break; 965 966 case MOD_UNLOAD: 967 rc = icl_cxgbei_mod_unload(); 968 if (rc == 0) 969 rc = cxgbei_mod_unload(); 970 break; 971 972 default: 973 rc = EINVAL; 974 } 975 #else 976 printf("cxgbei: compiled without TCP_OFFLOAD support.\n"); 977 rc = EOPNOTSUPP; 978 #endif 979 980 return (rc); 981 } 982 983 static moduledata_t cxgbei_mod = { 984 "cxgbei", 985 cxgbei_modevent, 986 NULL, 987 }; 988 989 MODULE_VERSION(cxgbei, 1); 990 DECLARE_MODULE(cxgbei, cxgbei_mod, SI_SUB_EXEC, SI_ORDER_ANY); 991 MODULE_DEPEND(cxgbei, t4_tom, 1, 1, 1); 992 MODULE_DEPEND(cxgbei, cxgbe, 1, 1, 1); 993 MODULE_DEPEND(cxgbei, icl, 1, 1, 1); 994