1 /* 2 * Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation. 3 * All rights reserved. 4 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 */ 34 35 #include "qib.h" 36 37 /* cut down ridiculously long IB macro names */ 38 #define OP(x) IB_OPCODE_UC_##x 39 40 /** 41 * qib_make_uc_req - construct a request packet (SEND, RDMA write) 42 * @qp: a pointer to the QP 43 * 44 * Assumes the s_lock is held. 45 * 46 * Return 1 if constructed; otherwise, return 0. 47 */ 48 int qib_make_uc_req(struct rvt_qp *qp, unsigned long *flags) 49 { 50 struct qib_qp_priv *priv = qp->priv; 51 struct ib_other_headers *ohdr; 52 struct rvt_swqe *wqe; 53 u32 hwords; 54 u32 bth0; 55 u32 len; 56 u32 pmtu = qp->pmtu; 57 int ret = 0; 58 59 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) { 60 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND)) 61 goto bail; 62 /* We are in the error state, flush the work request. */ 63 smp_read_barrier_depends(); /* see post_one_send() */ 64 if (qp->s_last == READ_ONCE(qp->s_head)) 65 goto bail; 66 /* If DMAs are in progress, we can't flush immediately. */ 67 if (atomic_read(&priv->s_dma_busy)) { 68 qp->s_flags |= RVT_S_WAIT_DMA; 69 goto bail; 70 } 71 wqe = rvt_get_swqe_ptr(qp, qp->s_last); 72 qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); 73 goto done; 74 } 75 76 ohdr = &priv->s_hdr->u.oth; 77 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) 78 ohdr = &priv->s_hdr->u.l.oth; 79 80 /* header size in 32-bit words LRH+BTH = (8+12)/4. */ 81 hwords = 5; 82 bth0 = 0; 83 84 /* Get the next send request. */ 85 wqe = rvt_get_swqe_ptr(qp, qp->s_cur); 86 qp->s_wqe = NULL; 87 switch (qp->s_state) { 88 default: 89 if (!(ib_rvt_state_ops[qp->state] & 90 RVT_PROCESS_NEXT_SEND_OK)) 91 goto bail; 92 /* Check if send work queue is empty. */ 93 smp_read_barrier_depends(); /* see post_one_send() */ 94 if (qp->s_cur == READ_ONCE(qp->s_head)) 95 goto bail; 96 /* 97 * Start a new request. 98 */ 99 qp->s_psn = wqe->psn; 100 qp->s_sge.sge = wqe->sg_list[0]; 101 qp->s_sge.sg_list = wqe->sg_list + 1; 102 qp->s_sge.num_sge = wqe->wr.num_sge; 103 qp->s_sge.total_len = wqe->length; 104 len = wqe->length; 105 qp->s_len = len; 106 switch (wqe->wr.opcode) { 107 case IB_WR_SEND: 108 case IB_WR_SEND_WITH_IMM: 109 if (len > pmtu) { 110 qp->s_state = OP(SEND_FIRST); 111 len = pmtu; 112 break; 113 } 114 if (wqe->wr.opcode == IB_WR_SEND) 115 qp->s_state = OP(SEND_ONLY); 116 else { 117 qp->s_state = 118 OP(SEND_ONLY_WITH_IMMEDIATE); 119 /* Immediate data comes after the BTH */ 120 ohdr->u.imm_data = wqe->wr.ex.imm_data; 121 hwords += 1; 122 } 123 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 124 bth0 |= IB_BTH_SOLICITED; 125 qp->s_wqe = wqe; 126 if (++qp->s_cur >= qp->s_size) 127 qp->s_cur = 0; 128 break; 129 130 case IB_WR_RDMA_WRITE: 131 case IB_WR_RDMA_WRITE_WITH_IMM: 132 ohdr->u.rc.reth.vaddr = 133 cpu_to_be64(wqe->rdma_wr.remote_addr); 134 ohdr->u.rc.reth.rkey = 135 cpu_to_be32(wqe->rdma_wr.rkey); 136 ohdr->u.rc.reth.length = cpu_to_be32(len); 137 hwords += sizeof(struct ib_reth) / 4; 138 if (len > pmtu) { 139 qp->s_state = OP(RDMA_WRITE_FIRST); 140 len = pmtu; 141 break; 142 } 143 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) 144 qp->s_state = OP(RDMA_WRITE_ONLY); 145 else { 146 qp->s_state = 147 OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); 148 /* Immediate data comes after the RETH */ 149 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data; 150 hwords += 1; 151 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 152 bth0 |= IB_BTH_SOLICITED; 153 } 154 qp->s_wqe = wqe; 155 if (++qp->s_cur >= qp->s_size) 156 qp->s_cur = 0; 157 break; 158 159 default: 160 goto bail; 161 } 162 break; 163 164 case OP(SEND_FIRST): 165 qp->s_state = OP(SEND_MIDDLE); 166 /* FALLTHROUGH */ 167 case OP(SEND_MIDDLE): 168 len = qp->s_len; 169 if (len > pmtu) { 170 len = pmtu; 171 break; 172 } 173 if (wqe->wr.opcode == IB_WR_SEND) 174 qp->s_state = OP(SEND_LAST); 175 else { 176 qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); 177 /* Immediate data comes after the BTH */ 178 ohdr->u.imm_data = wqe->wr.ex.imm_data; 179 hwords += 1; 180 } 181 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 182 bth0 |= IB_BTH_SOLICITED; 183 qp->s_wqe = wqe; 184 if (++qp->s_cur >= qp->s_size) 185 qp->s_cur = 0; 186 break; 187 188 case OP(RDMA_WRITE_FIRST): 189 qp->s_state = OP(RDMA_WRITE_MIDDLE); 190 /* FALLTHROUGH */ 191 case OP(RDMA_WRITE_MIDDLE): 192 len = qp->s_len; 193 if (len > pmtu) { 194 len = pmtu; 195 break; 196 } 197 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) 198 qp->s_state = OP(RDMA_WRITE_LAST); 199 else { 200 qp->s_state = 201 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); 202 /* Immediate data comes after the BTH */ 203 ohdr->u.imm_data = wqe->wr.ex.imm_data; 204 hwords += 1; 205 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 206 bth0 |= IB_BTH_SOLICITED; 207 } 208 qp->s_wqe = wqe; 209 if (++qp->s_cur >= qp->s_size) 210 qp->s_cur = 0; 211 break; 212 } 213 qp->s_len -= len; 214 qp->s_hdrwords = hwords; 215 qp->s_cur_sge = &qp->s_sge; 216 qp->s_cur_size = len; 217 qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24), 218 qp->s_psn++ & QIB_PSN_MASK); 219 done: 220 return 1; 221 bail: 222 qp->s_flags &= ~RVT_S_BUSY; 223 return ret; 224 } 225 226 /** 227 * qib_uc_rcv - handle an incoming UC packet 228 * @ibp: the port the packet came in on 229 * @hdr: the header of the packet 230 * @has_grh: true if the packet has a GRH 231 * @data: the packet data 232 * @tlen: the length of the packet 233 * @qp: the QP for this packet. 234 * 235 * This is called from qib_qp_rcv() to process an incoming UC packet 236 * for the given QP. 237 * Called at interrupt level. 238 */ 239 void qib_uc_rcv(struct qib_ibport *ibp, struct ib_header *hdr, 240 int has_grh, void *data, u32 tlen, struct rvt_qp *qp) 241 { 242 struct ib_other_headers *ohdr; 243 u32 opcode; 244 u32 hdrsize; 245 u32 psn; 246 u32 pad; 247 struct ib_wc wc; 248 u32 pmtu = qp->pmtu; 249 struct ib_reth *reth; 250 int ret; 251 252 /* Check for GRH */ 253 if (!has_grh) { 254 ohdr = &hdr->u.oth; 255 hdrsize = 8 + 12; /* LRH + BTH */ 256 } else { 257 ohdr = &hdr->u.l.oth; 258 hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */ 259 } 260 261 opcode = be32_to_cpu(ohdr->bth[0]); 262 if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode)) 263 return; 264 265 psn = be32_to_cpu(ohdr->bth[2]); 266 opcode >>= 24; 267 268 /* Compare the PSN verses the expected PSN. */ 269 if (unlikely(qib_cmp24(psn, qp->r_psn) != 0)) { 270 /* 271 * Handle a sequence error. 272 * Silently drop any current message. 273 */ 274 qp->r_psn = psn; 275 inv: 276 if (qp->r_state == OP(SEND_FIRST) || 277 qp->r_state == OP(SEND_MIDDLE)) { 278 set_bit(RVT_R_REWIND_SGE, &qp->r_aflags); 279 qp->r_sge.num_sge = 0; 280 } else 281 rvt_put_ss(&qp->r_sge); 282 qp->r_state = OP(SEND_LAST); 283 switch (opcode) { 284 case OP(SEND_FIRST): 285 case OP(SEND_ONLY): 286 case OP(SEND_ONLY_WITH_IMMEDIATE): 287 goto send_first; 288 289 case OP(RDMA_WRITE_FIRST): 290 case OP(RDMA_WRITE_ONLY): 291 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): 292 goto rdma_first; 293 294 default: 295 goto drop; 296 } 297 } 298 299 /* Check for opcode sequence errors. */ 300 switch (qp->r_state) { 301 case OP(SEND_FIRST): 302 case OP(SEND_MIDDLE): 303 if (opcode == OP(SEND_MIDDLE) || 304 opcode == OP(SEND_LAST) || 305 opcode == OP(SEND_LAST_WITH_IMMEDIATE)) 306 break; 307 goto inv; 308 309 case OP(RDMA_WRITE_FIRST): 310 case OP(RDMA_WRITE_MIDDLE): 311 if (opcode == OP(RDMA_WRITE_MIDDLE) || 312 opcode == OP(RDMA_WRITE_LAST) || 313 opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) 314 break; 315 goto inv; 316 317 default: 318 if (opcode == OP(SEND_FIRST) || 319 opcode == OP(SEND_ONLY) || 320 opcode == OP(SEND_ONLY_WITH_IMMEDIATE) || 321 opcode == OP(RDMA_WRITE_FIRST) || 322 opcode == OP(RDMA_WRITE_ONLY) || 323 opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) 324 break; 325 goto inv; 326 } 327 328 if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST)) 329 rvt_comm_est(qp); 330 331 /* OK, process the packet. */ 332 switch (opcode) { 333 case OP(SEND_FIRST): 334 case OP(SEND_ONLY): 335 case OP(SEND_ONLY_WITH_IMMEDIATE): 336 send_first: 337 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) 338 qp->r_sge = qp->s_rdma_read_sge; 339 else { 340 ret = qib_get_rwqe(qp, 0); 341 if (ret < 0) 342 goto op_err; 343 if (!ret) 344 goto drop; 345 /* 346 * qp->s_rdma_read_sge will be the owner 347 * of the mr references. 348 */ 349 qp->s_rdma_read_sge = qp->r_sge; 350 } 351 qp->r_rcv_len = 0; 352 if (opcode == OP(SEND_ONLY)) 353 goto no_immediate_data; 354 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE)) 355 goto send_last_imm; 356 /* FALLTHROUGH */ 357 case OP(SEND_MIDDLE): 358 /* Check for invalid length PMTU or posted rwqe len. */ 359 if (unlikely(tlen != (hdrsize + pmtu + 4))) 360 goto rewind; 361 qp->r_rcv_len += pmtu; 362 if (unlikely(qp->r_rcv_len > qp->r_len)) 363 goto rewind; 364 qib_copy_sge(&qp->r_sge, data, pmtu, 0); 365 break; 366 367 case OP(SEND_LAST_WITH_IMMEDIATE): 368 send_last_imm: 369 wc.ex.imm_data = ohdr->u.imm_data; 370 hdrsize += 4; 371 wc.wc_flags = IB_WC_WITH_IMM; 372 goto send_last; 373 case OP(SEND_LAST): 374 no_immediate_data: 375 wc.ex.imm_data = 0; 376 wc.wc_flags = 0; 377 send_last: 378 /* Get the number of bytes the message was padded by. */ 379 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; 380 /* Check for invalid length. */ 381 /* XXX LAST len should be >= 1 */ 382 if (unlikely(tlen < (hdrsize + pad + 4))) 383 goto rewind; 384 /* Don't count the CRC. */ 385 tlen -= (hdrsize + pad + 4); 386 wc.byte_len = tlen + qp->r_rcv_len; 387 if (unlikely(wc.byte_len > qp->r_len)) 388 goto rewind; 389 wc.opcode = IB_WC_RECV; 390 qib_copy_sge(&qp->r_sge, data, tlen, 0); 391 rvt_put_ss(&qp->s_rdma_read_sge); 392 last_imm: 393 wc.wr_id = qp->r_wr_id; 394 wc.status = IB_WC_SUCCESS; 395 wc.qp = &qp->ibqp; 396 wc.src_qp = qp->remote_qpn; 397 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr); 398 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr); 399 /* zero fields that are N/A */ 400 wc.vendor_err = 0; 401 wc.pkey_index = 0; 402 wc.dlid_path_bits = 0; 403 wc.port_num = 0; 404 /* Signal completion event if the solicited bit is set. */ 405 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 406 (ohdr->bth[0] & 407 cpu_to_be32(IB_BTH_SOLICITED)) != 0); 408 break; 409 410 case OP(RDMA_WRITE_FIRST): 411 case OP(RDMA_WRITE_ONLY): 412 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */ 413 rdma_first: 414 if (unlikely(!(qp->qp_access_flags & 415 IB_ACCESS_REMOTE_WRITE))) { 416 goto drop; 417 } 418 reth = &ohdr->u.rc.reth; 419 hdrsize += sizeof(*reth); 420 qp->r_len = be32_to_cpu(reth->length); 421 qp->r_rcv_len = 0; 422 qp->r_sge.sg_list = NULL; 423 if (qp->r_len != 0) { 424 u32 rkey = be32_to_cpu(reth->rkey); 425 u64 vaddr = be64_to_cpu(reth->vaddr); 426 int ok; 427 428 /* Check rkey */ 429 ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, 430 vaddr, rkey, IB_ACCESS_REMOTE_WRITE); 431 if (unlikely(!ok)) 432 goto drop; 433 qp->r_sge.num_sge = 1; 434 } else { 435 qp->r_sge.num_sge = 0; 436 qp->r_sge.sge.mr = NULL; 437 qp->r_sge.sge.vaddr = NULL; 438 qp->r_sge.sge.length = 0; 439 qp->r_sge.sge.sge_length = 0; 440 } 441 if (opcode == OP(RDMA_WRITE_ONLY)) 442 goto rdma_last; 443 else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) { 444 wc.ex.imm_data = ohdr->u.rc.imm_data; 445 goto rdma_last_imm; 446 } 447 /* FALLTHROUGH */ 448 case OP(RDMA_WRITE_MIDDLE): 449 /* Check for invalid length PMTU or posted rwqe len. */ 450 if (unlikely(tlen != (hdrsize + pmtu + 4))) 451 goto drop; 452 qp->r_rcv_len += pmtu; 453 if (unlikely(qp->r_rcv_len > qp->r_len)) 454 goto drop; 455 qib_copy_sge(&qp->r_sge, data, pmtu, 1); 456 break; 457 458 case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): 459 wc.ex.imm_data = ohdr->u.imm_data; 460 rdma_last_imm: 461 hdrsize += 4; 462 wc.wc_flags = IB_WC_WITH_IMM; 463 464 /* Get the number of bytes the message was padded by. */ 465 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; 466 /* Check for invalid length. */ 467 /* XXX LAST len should be >= 1 */ 468 if (unlikely(tlen < (hdrsize + pad + 4))) 469 goto drop; 470 /* Don't count the CRC. */ 471 tlen -= (hdrsize + pad + 4); 472 if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) 473 goto drop; 474 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) 475 rvt_put_ss(&qp->s_rdma_read_sge); 476 else { 477 ret = qib_get_rwqe(qp, 1); 478 if (ret < 0) 479 goto op_err; 480 if (!ret) 481 goto drop; 482 } 483 wc.byte_len = qp->r_len; 484 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; 485 qib_copy_sge(&qp->r_sge, data, tlen, 1); 486 rvt_put_ss(&qp->r_sge); 487 goto last_imm; 488 489 case OP(RDMA_WRITE_LAST): 490 rdma_last: 491 /* Get the number of bytes the message was padded by. */ 492 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; 493 /* Check for invalid length. */ 494 /* XXX LAST len should be >= 1 */ 495 if (unlikely(tlen < (hdrsize + pad + 4))) 496 goto drop; 497 /* Don't count the CRC. */ 498 tlen -= (hdrsize + pad + 4); 499 if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) 500 goto drop; 501 qib_copy_sge(&qp->r_sge, data, tlen, 1); 502 rvt_put_ss(&qp->r_sge); 503 break; 504 505 default: 506 /* Drop packet for unknown opcodes. */ 507 goto drop; 508 } 509 qp->r_psn++; 510 qp->r_state = opcode; 511 return; 512 513 rewind: 514 set_bit(RVT_R_REWIND_SGE, &qp->r_aflags); 515 qp->r_sge.num_sge = 0; 516 drop: 517 ibp->rvp.n_pkt_drops++; 518 return; 519 520 op_err: 521 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 522 return; 523 524 } 525