Bryan O'Sullivan | 74ed6b5 | 2006-03-29 15:23:34 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. |
| 3 | * |
| 4 | * This software is available to you under a choice of one of two |
| 5 | * licenses. You may choose to be licensed under the terms of the GNU |
| 6 | * General Public License (GPL) Version 2, available from the file |
| 7 | * COPYING in the main directory of this source tree, or the |
| 8 | * OpenIB.org BSD license below: |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or |
| 11 | * without modification, are permitted provided that the following |
| 12 | * conditions are met: |
| 13 | * |
| 14 | * - Redistributions of source code must retain the above |
| 15 | * copyright notice, this list of conditions and the following |
| 16 | * disclaimer. |
| 17 | * |
| 18 | * - Redistributions in binary form must reproduce the above |
| 19 | * copyright notice, this list of conditions and the following |
| 20 | * disclaimer in the documentation and/or other materials |
| 21 | * provided with the distribution. |
| 22 | * |
| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 30 | * SOFTWARE. |
| 31 | */ |
| 32 | |
| 33 | #include "ipath_verbs.h" |
| 34 | #include "ips_common.h" |
| 35 | |
| 36 | /* cut down ridiculously long IB macro names */ |
| 37 | #define OP(x) IB_OPCODE_UC_##x |
| 38 | |
| 39 | static void complete_last_send(struct ipath_qp *qp, struct ipath_swqe *wqe, |
| 40 | struct ib_wc *wc) |
| 41 | { |
| 42 | if (++qp->s_last == qp->s_size) |
| 43 | qp->s_last = 0; |
| 44 | if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &qp->s_flags) || |
| 45 | (wqe->wr.send_flags & IB_SEND_SIGNALED)) { |
| 46 | wc->wr_id = wqe->wr.wr_id; |
| 47 | wc->status = IB_WC_SUCCESS; |
| 48 | wc->opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; |
| 49 | wc->vendor_err = 0; |
| 50 | wc->byte_len = wqe->length; |
| 51 | wc->qp_num = qp->ibqp.qp_num; |
| 52 | wc->src_qp = qp->remote_qpn; |
| 53 | wc->pkey_index = 0; |
| 54 | wc->slid = qp->remote_ah_attr.dlid; |
| 55 | wc->sl = qp->remote_ah_attr.sl; |
| 56 | wc->dlid_path_bits = 0; |
| 57 | wc->port_num = 0; |
| 58 | ipath_cq_enter(to_icq(qp->ibqp.send_cq), wc, 0); |
| 59 | } |
| 60 | wqe = get_swqe_ptr(qp, qp->s_last); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * ipath_do_uc_send - do a send on a UC queue |
| 65 | * @data: contains a pointer to the QP to send on |
| 66 | * |
| 67 | * Process entries in the send work queue until the queue is exhausted. |
| 68 | * Only allow one CPU to send a packet per QP (tasklet). |
| 69 | * Otherwise, after we drop the QP lock, two threads could send |
| 70 | * packets out of order. |
| 71 | * This is similar to ipath_do_rc_send() below except we don't have |
| 72 | * timeouts or resends. |
| 73 | */ |
| 74 | void ipath_do_uc_send(unsigned long data) |
| 75 | { |
| 76 | struct ipath_qp *qp = (struct ipath_qp *)data; |
| 77 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); |
| 78 | struct ipath_swqe *wqe; |
| 79 | unsigned long flags; |
| 80 | u16 lrh0; |
| 81 | u32 hwords; |
| 82 | u32 nwords; |
| 83 | u32 extra_bytes; |
| 84 | u32 bth0; |
| 85 | u32 bth2; |
| 86 | u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); |
| 87 | u32 len; |
| 88 | struct ipath_other_headers *ohdr; |
| 89 | struct ib_wc wc; |
| 90 | |
| 91 | if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags)) |
| 92 | goto bail; |
| 93 | |
| 94 | if (unlikely(qp->remote_ah_attr.dlid == |
| 95 | ipath_layer_get_lid(dev->dd))) { |
| 96 | /* Pass in an uninitialized ib_wc to save stack space. */ |
| 97 | ipath_ruc_loopback(qp, &wc); |
| 98 | clear_bit(IPATH_S_BUSY, &qp->s_flags); |
| 99 | goto bail; |
| 100 | } |
| 101 | |
| 102 | ohdr = &qp->s_hdr.u.oth; |
| 103 | if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) |
| 104 | ohdr = &qp->s_hdr.u.l.oth; |
| 105 | |
| 106 | again: |
| 107 | /* Check for a constructed packet to be sent. */ |
| 108 | if (qp->s_hdrwords != 0) { |
| 109 | /* |
| 110 | * If no PIO bufs are available, return. |
| 111 | * An interrupt will call ipath_ib_piobufavail() |
| 112 | * when one is available. |
| 113 | */ |
| 114 | if (ipath_verbs_send(dev->dd, qp->s_hdrwords, |
| 115 | (u32 *) &qp->s_hdr, |
| 116 | qp->s_cur_size, |
| 117 | qp->s_cur_sge)) { |
| 118 | ipath_no_bufs_available(qp, dev); |
| 119 | goto bail; |
| 120 | } |
| 121 | dev->n_unicast_xmit++; |
| 122 | /* Record that we sent the packet and s_hdr is empty. */ |
| 123 | qp->s_hdrwords = 0; |
| 124 | } |
| 125 | |
| 126 | lrh0 = IPS_LRH_BTH; |
| 127 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ |
| 128 | hwords = 5; |
| 129 | |
| 130 | /* |
| 131 | * The lock is needed to synchronize between |
| 132 | * setting qp->s_ack_state and post_send(). |
| 133 | */ |
| 134 | spin_lock_irqsave(&qp->s_lock, flags); |
| 135 | |
| 136 | if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) |
| 137 | goto done; |
| 138 | |
| 139 | bth0 = ipath_layer_get_pkey(dev->dd, qp->s_pkey_index); |
| 140 | |
| 141 | /* Send a request. */ |
| 142 | wqe = get_swqe_ptr(qp, qp->s_last); |
| 143 | switch (qp->s_state) { |
| 144 | default: |
| 145 | /* |
| 146 | * Signal the completion of the last send (if there is |
| 147 | * one). |
| 148 | */ |
| 149 | if (qp->s_last != qp->s_tail) |
| 150 | complete_last_send(qp, wqe, &wc); |
| 151 | |
| 152 | /* Check if send work queue is empty. */ |
| 153 | if (qp->s_tail == qp->s_head) |
| 154 | goto done; |
| 155 | /* |
| 156 | * Start a new request. |
| 157 | */ |
| 158 | qp->s_psn = wqe->psn = qp->s_next_psn; |
| 159 | qp->s_sge.sge = wqe->sg_list[0]; |
| 160 | qp->s_sge.sg_list = wqe->sg_list + 1; |
| 161 | qp->s_sge.num_sge = wqe->wr.num_sge; |
| 162 | qp->s_len = len = wqe->length; |
| 163 | switch (wqe->wr.opcode) { |
| 164 | case IB_WR_SEND: |
| 165 | case IB_WR_SEND_WITH_IMM: |
| 166 | if (len > pmtu) { |
| 167 | qp->s_state = OP(SEND_FIRST); |
| 168 | len = pmtu; |
| 169 | break; |
| 170 | } |
| 171 | if (wqe->wr.opcode == IB_WR_SEND) |
| 172 | qp->s_state = OP(SEND_ONLY); |
| 173 | else { |
| 174 | qp->s_state = |
| 175 | OP(SEND_ONLY_WITH_IMMEDIATE); |
| 176 | /* Immediate data comes after the BTH */ |
| 177 | ohdr->u.imm_data = wqe->wr.imm_data; |
| 178 | hwords += 1; |
| 179 | } |
| 180 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) |
| 181 | bth0 |= 1 << 23; |
| 182 | break; |
| 183 | |
| 184 | case IB_WR_RDMA_WRITE: |
| 185 | case IB_WR_RDMA_WRITE_WITH_IMM: |
| 186 | ohdr->u.rc.reth.vaddr = |
| 187 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr); |
| 188 | ohdr->u.rc.reth.rkey = |
| 189 | cpu_to_be32(wqe->wr.wr.rdma.rkey); |
| 190 | ohdr->u.rc.reth.length = cpu_to_be32(len); |
| 191 | hwords += sizeof(struct ib_reth) / 4; |
| 192 | if (len > pmtu) { |
| 193 | qp->s_state = OP(RDMA_WRITE_FIRST); |
| 194 | len = pmtu; |
| 195 | break; |
| 196 | } |
| 197 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) |
| 198 | qp->s_state = OP(RDMA_WRITE_ONLY); |
| 199 | else { |
| 200 | qp->s_state = |
| 201 | OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); |
| 202 | /* Immediate data comes after the RETH */ |
| 203 | ohdr->u.rc.imm_data = wqe->wr.imm_data; |
| 204 | hwords += 1; |
| 205 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) |
| 206 | bth0 |= 1 << 23; |
| 207 | } |
| 208 | break; |
| 209 | |
| 210 | default: |
| 211 | goto done; |
| 212 | } |
| 213 | if (++qp->s_tail >= qp->s_size) |
| 214 | qp->s_tail = 0; |
| 215 | break; |
| 216 | |
| 217 | case OP(SEND_FIRST): |
| 218 | qp->s_state = OP(SEND_MIDDLE); |
| 219 | /* FALLTHROUGH */ |
| 220 | case OP(SEND_MIDDLE): |
| 221 | len = qp->s_len; |
| 222 | if (len > pmtu) { |
| 223 | len = pmtu; |
| 224 | break; |
| 225 | } |
| 226 | if (wqe->wr.opcode == IB_WR_SEND) |
| 227 | qp->s_state = OP(SEND_LAST); |
| 228 | else { |
| 229 | qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); |
| 230 | /* Immediate data comes after the BTH */ |
| 231 | ohdr->u.imm_data = wqe->wr.imm_data; |
| 232 | hwords += 1; |
| 233 | } |
| 234 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) |
| 235 | bth0 |= 1 << 23; |
| 236 | break; |
| 237 | |
| 238 | case OP(RDMA_WRITE_FIRST): |
| 239 | qp->s_state = OP(RDMA_WRITE_MIDDLE); |
| 240 | /* FALLTHROUGH */ |
| 241 | case OP(RDMA_WRITE_MIDDLE): |
| 242 | len = qp->s_len; |
| 243 | if (len > pmtu) { |
| 244 | len = pmtu; |
| 245 | break; |
| 246 | } |
| 247 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) |
| 248 | qp->s_state = OP(RDMA_WRITE_LAST); |
| 249 | else { |
| 250 | qp->s_state = |
| 251 | OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); |
| 252 | /* Immediate data comes after the BTH */ |
| 253 | ohdr->u.imm_data = wqe->wr.imm_data; |
| 254 | hwords += 1; |
| 255 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) |
| 256 | bth0 |= 1 << 23; |
| 257 | } |
| 258 | break; |
| 259 | } |
| 260 | bth2 = qp->s_next_psn++ & IPS_PSN_MASK; |
| 261 | qp->s_len -= len; |
| 262 | bth0 |= qp->s_state << 24; |
| 263 | |
| 264 | spin_unlock_irqrestore(&qp->s_lock, flags); |
| 265 | |
| 266 | /* Construct the header. */ |
| 267 | extra_bytes = (4 - len) & 3; |
| 268 | nwords = (len + extra_bytes) >> 2; |
| 269 | if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { |
| 270 | /* Header size in 32-bit words. */ |
| 271 | hwords += 10; |
| 272 | lrh0 = IPS_LRH_GRH; |
| 273 | qp->s_hdr.u.l.grh.version_tclass_flow = |
| 274 | cpu_to_be32((6 << 28) | |
| 275 | (qp->remote_ah_attr.grh.traffic_class |
| 276 | << 20) | |
| 277 | qp->remote_ah_attr.grh.flow_label); |
| 278 | qp->s_hdr.u.l.grh.paylen = |
| 279 | cpu_to_be16(((hwords - 12) + nwords + |
| 280 | SIZE_OF_CRC) << 2); |
| 281 | /* next_hdr is defined by C8-7 in ch. 8.4.1 */ |
| 282 | qp->s_hdr.u.l.grh.next_hdr = 0x1B; |
| 283 | qp->s_hdr.u.l.grh.hop_limit = |
| 284 | qp->remote_ah_attr.grh.hop_limit; |
| 285 | /* The SGID is 32-bit aligned. */ |
| 286 | qp->s_hdr.u.l.grh.sgid.global.subnet_prefix = |
| 287 | dev->gid_prefix; |
| 288 | qp->s_hdr.u.l.grh.sgid.global.interface_id = |
| 289 | ipath_layer_get_guid(dev->dd); |
| 290 | qp->s_hdr.u.l.grh.dgid = qp->remote_ah_attr.grh.dgid; |
| 291 | } |
| 292 | qp->s_hdrwords = hwords; |
| 293 | qp->s_cur_sge = &qp->s_sge; |
| 294 | qp->s_cur_size = len; |
| 295 | lrh0 |= qp->remote_ah_attr.sl << 4; |
| 296 | qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); |
| 297 | /* DEST LID */ |
| 298 | qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); |
| 299 | qp->s_hdr.lrh[2] = cpu_to_be16(hwords + nwords + SIZE_OF_CRC); |
| 300 | qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd)); |
| 301 | bth0 |= extra_bytes << 20; |
| 302 | ohdr->bth[0] = cpu_to_be32(bth0); |
| 303 | ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); |
| 304 | ohdr->bth[2] = cpu_to_be32(bth2); |
| 305 | |
| 306 | /* Check for more work to do. */ |
| 307 | goto again; |
| 308 | |
| 309 | done: |
| 310 | spin_unlock_irqrestore(&qp->s_lock, flags); |
| 311 | clear_bit(IPATH_S_BUSY, &qp->s_flags); |
| 312 | |
| 313 | bail: |
| 314 | return; |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * ipath_uc_rcv - handle an incoming UC packet |
| 319 | * @dev: the device the packet came in on |
| 320 | * @hdr: the header of the packet |
| 321 | * @has_grh: true if the packet has a GRH |
| 322 | * @data: the packet data |
| 323 | * @tlen: the length of the packet |
| 324 | * @qp: the QP for this packet. |
| 325 | * |
| 326 | * This is called from ipath_qp_rcv() to process an incoming UC packet |
| 327 | * for the given QP. |
| 328 | * Called at interrupt level. |
| 329 | */ |
| 330 | void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, |
| 331 | int has_grh, void *data, u32 tlen, struct ipath_qp *qp) |
| 332 | { |
| 333 | struct ipath_other_headers *ohdr; |
| 334 | int opcode; |
| 335 | u32 hdrsize; |
| 336 | u32 psn; |
| 337 | u32 pad; |
| 338 | unsigned long flags; |
| 339 | struct ib_wc wc; |
| 340 | u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); |
| 341 | struct ib_reth *reth; |
| 342 | int header_in_data; |
| 343 | |
| 344 | /* Check for GRH */ |
| 345 | if (!has_grh) { |
| 346 | ohdr = &hdr->u.oth; |
| 347 | hdrsize = 8 + 12; /* LRH + BTH */ |
| 348 | psn = be32_to_cpu(ohdr->bth[2]); |
| 349 | header_in_data = 0; |
| 350 | } else { |
| 351 | ohdr = &hdr->u.l.oth; |
| 352 | hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */ |
| 353 | /* |
| 354 | * The header with GRH is 60 bytes and the |
| 355 | * core driver sets the eager header buffer |
| 356 | * size to 56 bytes so the last 4 bytes of |
| 357 | * the BTH header (PSN) is in the data buffer. |
| 358 | */ |
| 359 | header_in_data = |
| 360 | ipath_layer_get_rcvhdrentsize(dev->dd) == 16; |
| 361 | if (header_in_data) { |
| 362 | psn = be32_to_cpu(((__be32 *) data)[0]); |
| 363 | data += sizeof(__be32); |
| 364 | } else |
| 365 | psn = be32_to_cpu(ohdr->bth[2]); |
| 366 | } |
| 367 | /* |
| 368 | * The opcode is in the low byte when its in network order |
| 369 | * (top byte when in host order). |
| 370 | */ |
| 371 | opcode = be32_to_cpu(ohdr->bth[0]) >> 24; |
| 372 | |
| 373 | wc.imm_data = 0; |
| 374 | wc.wc_flags = 0; |
| 375 | |
| 376 | spin_lock_irqsave(&qp->r_rq.lock, flags); |
| 377 | |
| 378 | /* Compare the PSN verses the expected PSN. */ |
| 379 | if (unlikely(ipath_cmp24(psn, qp->r_psn) != 0)) { |
| 380 | /* |
| 381 | * Handle a sequence error. |
| 382 | * Silently drop any current message. |
| 383 | */ |
| 384 | qp->r_psn = psn; |
| 385 | inv: |
| 386 | qp->r_state = OP(SEND_LAST); |
| 387 | switch (opcode) { |
| 388 | case OP(SEND_FIRST): |
| 389 | case OP(SEND_ONLY): |
| 390 | case OP(SEND_ONLY_WITH_IMMEDIATE): |
| 391 | goto send_first; |
| 392 | |
| 393 | case OP(RDMA_WRITE_FIRST): |
| 394 | case OP(RDMA_WRITE_ONLY): |
| 395 | case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): |
| 396 | goto rdma_first; |
| 397 | |
| 398 | default: |
| 399 | dev->n_pkt_drops++; |
| 400 | goto done; |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | /* Check for opcode sequence errors. */ |
| 405 | switch (qp->r_state) { |
| 406 | case OP(SEND_FIRST): |
| 407 | case OP(SEND_MIDDLE): |
| 408 | if (opcode == OP(SEND_MIDDLE) || |
| 409 | opcode == OP(SEND_LAST) || |
| 410 | opcode == OP(SEND_LAST_WITH_IMMEDIATE)) |
| 411 | break; |
| 412 | goto inv; |
| 413 | |
| 414 | case OP(RDMA_WRITE_FIRST): |
| 415 | case OP(RDMA_WRITE_MIDDLE): |
| 416 | if (opcode == OP(RDMA_WRITE_MIDDLE) || |
| 417 | opcode == OP(RDMA_WRITE_LAST) || |
| 418 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) |
| 419 | break; |
| 420 | goto inv; |
| 421 | |
| 422 | default: |
| 423 | if (opcode == OP(SEND_FIRST) || |
| 424 | opcode == OP(SEND_ONLY) || |
| 425 | opcode == OP(SEND_ONLY_WITH_IMMEDIATE) || |
| 426 | opcode == OP(RDMA_WRITE_FIRST) || |
| 427 | opcode == OP(RDMA_WRITE_ONLY) || |
| 428 | opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) |
| 429 | break; |
| 430 | goto inv; |
| 431 | } |
| 432 | |
| 433 | /* OK, process the packet. */ |
| 434 | switch (opcode) { |
| 435 | case OP(SEND_FIRST): |
| 436 | case OP(SEND_ONLY): |
| 437 | case OP(SEND_ONLY_WITH_IMMEDIATE): |
| 438 | send_first: |
| 439 | if (qp->r_reuse_sge) { |
| 440 | qp->r_reuse_sge = 0; |
| 441 | qp->r_sge = qp->s_rdma_sge; |
| 442 | } else if (!ipath_get_rwqe(qp, 0)) { |
| 443 | dev->n_pkt_drops++; |
| 444 | goto done; |
| 445 | } |
| 446 | /* Save the WQE so we can reuse it in case of an error. */ |
| 447 | qp->s_rdma_sge = qp->r_sge; |
| 448 | qp->r_rcv_len = 0; |
| 449 | if (opcode == OP(SEND_ONLY)) |
| 450 | goto send_last; |
| 451 | else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE)) |
| 452 | goto send_last_imm; |
| 453 | /* FALLTHROUGH */ |
| 454 | case OP(SEND_MIDDLE): |
| 455 | /* Check for invalid length PMTU or posted rwqe len. */ |
| 456 | if (unlikely(tlen != (hdrsize + pmtu + 4))) { |
| 457 | qp->r_reuse_sge = 1; |
| 458 | dev->n_pkt_drops++; |
| 459 | goto done; |
| 460 | } |
| 461 | qp->r_rcv_len += pmtu; |
| 462 | if (unlikely(qp->r_rcv_len > qp->r_len)) { |
| 463 | qp->r_reuse_sge = 1; |
| 464 | dev->n_pkt_drops++; |
| 465 | goto done; |
| 466 | } |
| 467 | ipath_copy_sge(&qp->r_sge, data, pmtu); |
| 468 | break; |
| 469 | |
| 470 | case OP(SEND_LAST_WITH_IMMEDIATE): |
| 471 | send_last_imm: |
| 472 | if (header_in_data) { |
| 473 | wc.imm_data = *(__be32 *) data; |
| 474 | data += sizeof(__be32); |
| 475 | } else { |
| 476 | /* Immediate data comes after BTH */ |
| 477 | wc.imm_data = ohdr->u.imm_data; |
| 478 | } |
| 479 | hdrsize += 4; |
| 480 | wc.wc_flags = IB_WC_WITH_IMM; |
| 481 | /* FALLTHROUGH */ |
| 482 | case OP(SEND_LAST): |
| 483 | send_last: |
| 484 | /* Get the number of bytes the message was padded by. */ |
| 485 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; |
| 486 | /* Check for invalid length. */ |
| 487 | /* XXX LAST len should be >= 1 */ |
| 488 | if (unlikely(tlen < (hdrsize + pad + 4))) { |
| 489 | qp->r_reuse_sge = 1; |
| 490 | dev->n_pkt_drops++; |
| 491 | goto done; |
| 492 | } |
| 493 | /* Don't count the CRC. */ |
| 494 | tlen -= (hdrsize + pad + 4); |
| 495 | wc.byte_len = tlen + qp->r_rcv_len; |
| 496 | if (unlikely(wc.byte_len > qp->r_len)) { |
| 497 | qp->r_reuse_sge = 1; |
| 498 | dev->n_pkt_drops++; |
| 499 | goto done; |
| 500 | } |
| 501 | /* XXX Need to free SGEs */ |
| 502 | last_imm: |
| 503 | ipath_copy_sge(&qp->r_sge, data, tlen); |
| 504 | wc.wr_id = qp->r_wr_id; |
| 505 | wc.status = IB_WC_SUCCESS; |
| 506 | wc.opcode = IB_WC_RECV; |
| 507 | wc.vendor_err = 0; |
| 508 | wc.qp_num = qp->ibqp.qp_num; |
| 509 | wc.src_qp = qp->remote_qpn; |
| 510 | wc.pkey_index = 0; |
| 511 | wc.slid = qp->remote_ah_attr.dlid; |
| 512 | wc.sl = qp->remote_ah_attr.sl; |
| 513 | wc.dlid_path_bits = 0; |
| 514 | wc.port_num = 0; |
| 515 | /* Signal completion event if the solicited bit is set. */ |
| 516 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, |
| 517 | (ohdr->bth[0] & |
| 518 | __constant_cpu_to_be32(1 << 23)) != 0); |
| 519 | break; |
| 520 | |
| 521 | case OP(RDMA_WRITE_FIRST): |
| 522 | case OP(RDMA_WRITE_ONLY): |
| 523 | case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */ |
| 524 | rdma_first: |
| 525 | /* RETH comes after BTH */ |
| 526 | if (!header_in_data) |
| 527 | reth = &ohdr->u.rc.reth; |
| 528 | else { |
| 529 | reth = (struct ib_reth *)data; |
| 530 | data += sizeof(*reth); |
| 531 | } |
| 532 | hdrsize += sizeof(*reth); |
| 533 | qp->r_len = be32_to_cpu(reth->length); |
| 534 | qp->r_rcv_len = 0; |
| 535 | if (qp->r_len != 0) { |
| 536 | u32 rkey = be32_to_cpu(reth->rkey); |
| 537 | u64 vaddr = be64_to_cpu(reth->vaddr); |
| 538 | |
| 539 | /* Check rkey */ |
| 540 | if (unlikely(!ipath_rkey_ok( |
| 541 | dev, &qp->r_sge, qp->r_len, |
| 542 | vaddr, rkey, |
| 543 | IB_ACCESS_REMOTE_WRITE))) { |
| 544 | dev->n_pkt_drops++; |
| 545 | goto done; |
| 546 | } |
| 547 | } else { |
| 548 | qp->r_sge.sg_list = NULL; |
| 549 | qp->r_sge.sge.mr = NULL; |
| 550 | qp->r_sge.sge.vaddr = NULL; |
| 551 | qp->r_sge.sge.length = 0; |
| 552 | qp->r_sge.sge.sge_length = 0; |
| 553 | } |
| 554 | if (unlikely(!(qp->qp_access_flags & |
| 555 | IB_ACCESS_REMOTE_WRITE))) { |
| 556 | dev->n_pkt_drops++; |
| 557 | goto done; |
| 558 | } |
| 559 | if (opcode == OP(RDMA_WRITE_ONLY)) |
| 560 | goto rdma_last; |
| 561 | else if (opcode == |
| 562 | OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) |
| 563 | goto rdma_last_imm; |
| 564 | /* FALLTHROUGH */ |
| 565 | case OP(RDMA_WRITE_MIDDLE): |
| 566 | /* Check for invalid length PMTU or posted rwqe len. */ |
| 567 | if (unlikely(tlen != (hdrsize + pmtu + 4))) { |
| 568 | dev->n_pkt_drops++; |
| 569 | goto done; |
| 570 | } |
| 571 | qp->r_rcv_len += pmtu; |
| 572 | if (unlikely(qp->r_rcv_len > qp->r_len)) { |
| 573 | dev->n_pkt_drops++; |
| 574 | goto done; |
| 575 | } |
| 576 | ipath_copy_sge(&qp->r_sge, data, pmtu); |
| 577 | break; |
| 578 | |
| 579 | case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): |
| 580 | rdma_last_imm: |
| 581 | /* Get the number of bytes the message was padded by. */ |
| 582 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; |
| 583 | /* Check for invalid length. */ |
| 584 | /* XXX LAST len should be >= 1 */ |
| 585 | if (unlikely(tlen < (hdrsize + pad + 4))) { |
| 586 | dev->n_pkt_drops++; |
| 587 | goto done; |
| 588 | } |
| 589 | /* Don't count the CRC. */ |
| 590 | tlen -= (hdrsize + pad + 4); |
| 591 | if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) { |
| 592 | dev->n_pkt_drops++; |
| 593 | goto done; |
| 594 | } |
| 595 | if (qp->r_reuse_sge) { |
| 596 | qp->r_reuse_sge = 0; |
| 597 | } else if (!ipath_get_rwqe(qp, 1)) { |
| 598 | dev->n_pkt_drops++; |
| 599 | goto done; |
| 600 | } |
| 601 | if (header_in_data) { |
| 602 | wc.imm_data = *(__be32 *) data; |
| 603 | data += sizeof(__be32); |
| 604 | } else { |
| 605 | /* Immediate data comes after BTH */ |
| 606 | wc.imm_data = ohdr->u.imm_data; |
| 607 | } |
| 608 | hdrsize += 4; |
| 609 | wc.wc_flags = IB_WC_WITH_IMM; |
| 610 | wc.byte_len = 0; |
| 611 | goto last_imm; |
| 612 | |
| 613 | case OP(RDMA_WRITE_LAST): |
| 614 | rdma_last: |
| 615 | /* Get the number of bytes the message was padded by. */ |
| 616 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; |
| 617 | /* Check for invalid length. */ |
| 618 | /* XXX LAST len should be >= 1 */ |
| 619 | if (unlikely(tlen < (hdrsize + pad + 4))) { |
| 620 | dev->n_pkt_drops++; |
| 621 | goto done; |
| 622 | } |
| 623 | /* Don't count the CRC. */ |
| 624 | tlen -= (hdrsize + pad + 4); |
| 625 | if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) { |
| 626 | dev->n_pkt_drops++; |
| 627 | goto done; |
| 628 | } |
| 629 | ipath_copy_sge(&qp->r_sge, data, tlen); |
| 630 | break; |
| 631 | |
| 632 | default: |
| 633 | /* Drop packet for unknown opcodes. */ |
| 634 | spin_unlock_irqrestore(&qp->r_rq.lock, flags); |
| 635 | dev->n_pkt_drops++; |
| 636 | goto bail; |
| 637 | } |
| 638 | qp->r_psn++; |
| 639 | qp->r_state = opcode; |
| 640 | done: |
| 641 | spin_unlock_irqrestore(&qp->r_rq.lock, flags); |
| 642 | |
| 643 | bail: |
| 644 | return; |
| 645 | } |