The Tcpdump Group git mirrors - libpcap/blob - pcap-rdmasniff.c

   1 /*
   2  * Copyright (c) 2017 Pure Storage, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   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  * 3. The name of the author may not be used to endorse or promote
  15  * products derived from this software without specific prior written
  16  * permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include <config.h>
  32
  33 #include "pcap-int.h"
  34 #include "pcap-rdmasniff.h"
  35
  36 #include <infiniband/verbs.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <limits.h> /* for INT_MAX */
  40 #include <sys/time.h>
  41
  42 #if !defined(IBV_FLOW_ATTR_SNIFFER)
  43 #define IBV_FLOW_ATTR_SNIFFER   3
  44 #endif
  45
  46 static const int RDMASNIFF_NUM_RECEIVES = 128;
  47 static const int RDMASNIFF_RECEIVE_SIZE = 10000;
  48
  49 struct pcap_rdmasniff {
  50         struct ibv_device *             rdma_device;
  51         struct ibv_context *            context;
  52         struct ibv_comp_channel *       channel;
  53         struct ibv_pd *                 pd;
  54         struct ibv_cq *                 cq;
  55         struct ibv_qp *                 qp;
  56         struct ibv_flow *               flow;
  57         struct ibv_mr *                 mr;
  58         u_char *                        oneshot_buffer;
  59         unsigned long                   port_num;
  60         int                             cq_event;
  61         u_int                           packets_recv;
  62 };
  63
  64 static int
  65 rdmasniff_stats(pcap_t *handle, struct pcap_stat *stat)
  66 {
  67         struct pcap_rdmasniff *priv = handle->priv;
  68
  69         stat->ps_recv = priv->packets_recv;
  70         stat->ps_drop = 0;
  71         stat->ps_ifdrop = 0;
  72
  73         return 0;
  74 }
  75
  76 static void
  77 rdmasniff_cleanup(pcap_t *handle)
  78 {
  79         struct pcap_rdmasniff *priv = handle->priv;
  80
  81         ibv_dereg_mr(priv->mr);
  82         ibv_destroy_flow(priv->flow);
  83         ibv_destroy_qp(priv->qp);
  84         ibv_destroy_cq(priv->cq);
  85         ibv_dealloc_pd(priv->pd);
  86         ibv_destroy_comp_channel(priv->channel);
  87         ibv_close_device(priv->context);
  88         free(priv->oneshot_buffer);
  89
  90         pcapint_cleanup_live_common(handle);
  91 }
  92
  93 static void
  94 rdmasniff_post_recv(pcap_t *handle, uint64_t wr_id)
  95 {
  96         struct pcap_rdmasniff *priv = handle->priv;
  97         struct ibv_sge sg_entry;
  98         struct ibv_recv_wr wr, *bad_wr;
  99
 100         sg_entry.length = RDMASNIFF_RECEIVE_SIZE;
 101         sg_entry.addr = (uintptr_t) handle->buffer + RDMASNIFF_RECEIVE_SIZE * wr_id;
 102         sg_entry.lkey = priv->mr->lkey;
 103
 104         wr.wr_id = wr_id;
 105         wr.num_sge = 1;
 106         wr.sg_list = &sg_entry;
 107         wr.next = NULL;
 108
 109         ibv_post_recv(priv->qp, &wr, &bad_wr);
 110 }
 111
 112 static int
 113 rdmasniff_read(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
 114 {
 115         struct pcap_rdmasniff *priv = handle->priv;
 116         struct ibv_cq *ev_cq;
 117         void *ev_ctx;
 118         struct ibv_wc wc;
 119         struct pcap_pkthdr pkth;
 120         u_char *pktd;
 121         int count = 0;
 122
 123         if (!priv->cq_event) {
 124                 while (ibv_get_cq_event(priv->channel, &ev_cq, &ev_ctx) < 0) {
 125                         if (errno != EINTR) {
 126                                 return PCAP_ERROR;
 127                         }
 128                         if (handle->break_loop) {
 129                                 handle->break_loop = 0;
 130                                 return PCAP_ERROR_BREAK;
 131                         }
 132                 }
 133                 ibv_ack_cq_events(priv->cq, 1);
 134                 ibv_req_notify_cq(priv->cq, 0);
 135                 priv->cq_event = 1;
 136         }
 137
 138         /*
 139          * This can conceivably process more than INT_MAX packets,
 140          * which would overflow the packet count, causing it either
 141          * to look like a negative number, and thus cause us to
 142          * return a value that looks like an error, or overflow
 143          * back into positive territory, and thus cause us to
 144          * return a too-low count.
 145          *
 146          * Therefore, if the packet count is unlimited, we clip
 147          * it at INT_MAX; this routine is not expected to
 148          * process packets indefinitely, so that's not an issue.
 149          */
 150         if (PACKET_COUNT_IS_UNLIMITED(max_packets))
 151                 max_packets = INT_MAX;
 152
 153         while (count < max_packets) {
 154                 if (ibv_poll_cq(priv->cq, 1, &wc) != 1) {
 155                         priv->cq_event = 0;
 156                         break;
 157                 }
 158
 159                 if (wc.status != IBV_WC_SUCCESS) {
 160                         fprintf(stderr, "failed WC wr_id %" PRIu64 " status %d/%s\n",
 161                                 wc.wr_id,
 162                                 wc.status, ibv_wc_status_str(wc.status));
 163                         continue;
 164                 }
 165
 166                 pkth.len = wc.byte_len;
 167                 pkth.caplen = min(pkth.len, (u_int)handle->snapshot);
 168                 gettimeofday(&pkth.ts, NULL);
 169
 170                 pktd = handle->buffer + wc.wr_id * RDMASNIFF_RECEIVE_SIZE;
 171
 172                 if (handle->fcode.bf_insns == NULL ||
 173                     pcapint_filter(handle->fcode.bf_insns, pktd, pkth.len, pkth.caplen)) {
 174                         callback(user, &pkth, pktd);
 175                         ++priv->packets_recv;
 176                         ++count;
 177                 }
 178
 179                 rdmasniff_post_recv(handle, wc.wr_id);
 180
 181                 if (handle->break_loop) {
 182                         handle->break_loop = 0;
 183                         return PCAP_ERROR_BREAK;
 184                 }
 185         }
 186
 187         return count;
 188 }
 189
 190 static void
 191 rdmasniff_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *bytes)
 192 {
 193         struct oneshot_userdata *sp = (struct oneshot_userdata *) user;
 194         pcap_t *handle = sp->pd;
 195         struct pcap_rdmasniff *priv = handle->priv;
 196
 197         *sp->hdr = *h;
 198         memcpy(priv->oneshot_buffer, bytes, h->caplen);
 199         *sp->pkt = priv->oneshot_buffer;
 200 }
 201
 202 static int
 203 rdmasniff_activate(pcap_t *handle)
 204 {
 205         struct pcap_rdmasniff *priv = handle->priv;
 206         struct ibv_qp_init_attr qp_init_attr;
 207         struct ibv_qp_attr qp_attr;
 208         struct ibv_flow_attr flow_attr;
 209         struct ibv_port_attr port_attr;
 210         int i;
 211
 212         priv->context = ibv_open_device(priv->rdma_device);
 213         if (!priv->context) {
 214                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 215                               "Failed to open device %s", handle->opt.device);
 216                 goto error;
 217         }
 218
 219         priv->pd = ibv_alloc_pd(priv->context);
 220         if (!priv->pd) {
 221                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 222                               "Failed to alloc PD for device %s", handle->opt.device);
 223                 goto error;
 224         }
 225
 226         priv->channel = ibv_create_comp_channel(priv->context);
 227         if (!priv->channel) {
 228                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 229                               "Failed to create comp channel for device %s", handle->opt.device);
 230                 goto error;
 231         }
 232
 233         priv->cq = ibv_create_cq(priv->context, RDMASNIFF_NUM_RECEIVES,
 234                                  NULL, priv->channel, 0);
 235         if (!priv->cq) {
 236                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 237                               "Failed to create CQ for device %s", handle->opt.device);
 238                 goto error;
 239         }
 240
 241         ibv_req_notify_cq(priv->cq, 0);
 242
 243         memset(&qp_init_attr, 0, sizeof qp_init_attr);
 244         qp_init_attr.send_cq = qp_init_attr.recv_cq = priv->cq;
 245         qp_init_attr.cap.max_recv_wr = RDMASNIFF_NUM_RECEIVES;
 246         qp_init_attr.cap.max_recv_sge = 1;
 247         qp_init_attr.qp_type = IBV_QPT_RAW_PACKET;
 248         priv->qp = ibv_create_qp(priv->pd, &qp_init_attr);
 249         if (!priv->qp) {
 250                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 251                               "Failed to create QP for device %s", handle->opt.device);
 252                 goto error;
 253         }
 254
 255         memset(&qp_attr, 0, sizeof qp_attr);
 256         qp_attr.qp_state = IBV_QPS_INIT;
 257         qp_attr.port_num = priv->port_num;
 258         if (ibv_modify_qp(priv->qp, &qp_attr, IBV_QP_STATE | IBV_QP_PORT)) {
 259                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 260                               "Failed to modify QP to INIT for device %s", handle->opt.device);
 261                 goto error;
 262         }
 263
 264         memset(&qp_attr, 0, sizeof qp_attr);
 265         qp_attr.qp_state = IBV_QPS_RTR;
 266         if (ibv_modify_qp(priv->qp, &qp_attr, IBV_QP_STATE)) {
 267                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 268                               "Failed to modify QP to RTR for device %s", handle->opt.device);
 269                 goto error;
 270         }
 271
 272         memset(&flow_attr, 0, sizeof flow_attr);
 273         flow_attr.type = IBV_FLOW_ATTR_SNIFFER;
 274         flow_attr.size = sizeof flow_attr;
 275         flow_attr.port = priv->port_num;
 276         priv->flow = ibv_create_flow(priv->qp, &flow_attr);
 277         if (!priv->flow) {
 278                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 279                               "Failed to create flow for device %s", handle->opt.device);
 280                 goto error;
 281         }
 282
 283         handle->bufsize = RDMASNIFF_NUM_RECEIVES * RDMASNIFF_RECEIVE_SIZE;
 284         handle->buffer = malloc(handle->bufsize);
 285         if (!handle->buffer) {
 286                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 287                               "Failed to allocate receive buffer for device %s", handle->opt.device);
 288                 goto error;
 289         }
 290
 291         priv->oneshot_buffer = malloc(RDMASNIFF_RECEIVE_SIZE);
 292         if (!priv->oneshot_buffer) {
 293                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 294                               "Failed to allocate oneshot buffer for device %s", handle->opt.device);
 295                 goto error;
 296         }
 297
 298         priv->mr = ibv_reg_mr(priv->pd, handle->buffer, handle->bufsize, IBV_ACCESS_LOCAL_WRITE);
 299         if (!priv->mr) {
 300                 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
 301                               "Failed to register MR for device %s", handle->opt.device);
 302                 goto error;
 303         }
 304
 305
 306         for (i = 0; i < RDMASNIFF_NUM_RECEIVES; ++i) {
 307                 rdmasniff_post_recv(handle, i);
 308         }
 309
 310         if (!ibv_query_port(priv->context, priv->port_num, &port_attr) &&
 311             port_attr.link_layer == IBV_LINK_LAYER_INFINIBAND) {
 312                 handle->linktype = DLT_INFINIBAND;
 313         } else {
 314                 handle->linktype = DLT_EN10MB;
 315         }
 316
 317         if (handle->snapshot <= 0 || handle->snapshot > RDMASNIFF_RECEIVE_SIZE)
 318                 handle->snapshot = RDMASNIFF_RECEIVE_SIZE;
 319
 320         handle->offset = 0;
 321         handle->read_op = rdmasniff_read;
 322         handle->stats_op = rdmasniff_stats;
 323         handle->cleanup_op = rdmasniff_cleanup;
 324         handle->setfilter_op = pcapint_install_bpf_program;
 325         handle->setdirection_op = NULL;
 326         handle->set_datalink_op = NULL;
 327         handle->getnonblock_op = pcapint_getnonblock_fd;
 328         handle->setnonblock_op = pcapint_setnonblock_fd;
 329         handle->oneshot_callback = rdmasniff_oneshot;
 330         handle->selectable_fd = priv->channel->fd;
 331
 332         return 0;
 333
 334 error:
 335         if (priv->mr) {
 336                 ibv_dereg_mr(priv->mr);
 337         }
 338
 339         if (priv->flow) {
 340                 ibv_destroy_flow(priv->flow);
 341         }
 342
 343         if (priv->qp) {
 344                 ibv_destroy_qp(priv->qp);
 345         }
 346
 347         if (priv->cq) {
 348                 ibv_destroy_cq(priv->cq);
 349         }
 350
 351         if (priv->channel) {
 352                 ibv_destroy_comp_channel(priv->channel);
 353         }
 354
 355         if (priv->pd) {
 356                 ibv_dealloc_pd(priv->pd);
 357         }
 358
 359         if (priv->context) {
 360                 ibv_close_device(priv->context);
 361         }
 362
 363         if (priv->oneshot_buffer) {
 364                 free(priv->oneshot_buffer);
 365         }
 366
 367         return PCAP_ERROR;
 368 }
 369
 370 pcap_t *
 371 rdmasniff_create(const char *device, char *ebuf, int *is_ours)
 372 {
 373         struct pcap_rdmasniff *priv;
 374         struct ibv_device **dev_list;
 375         int numdev;
 376         size_t namelen;
 377         const char *port;
 378         unsigned long port_num;
 379         int i;
 380         pcap_t *p = NULL;
 381
 382         *is_ours = 0;
 383
 384         dev_list = ibv_get_device_list(&numdev);
 385         if (!dev_list) {
 386                 return NULL;
 387         }
 388         if (!numdev) {
 389                 ibv_free_device_list(dev_list);
 390                 return NULL;
 391         }
 392
 393         namelen = strlen(device);
 394
 395         port = strchr(device, ':');
 396         if (port) {
 397                 port_num = strtoul(port + 1, NULL, 10);
 398                 if (port_num > 0) {
 399                         namelen = port - device;
 400                 } else {
 401                         port_num = 1;
 402                 }
 403         } else {
 404                 port_num = 1;
 405         }
 406
 407         for (i = 0; i < numdev; ++i) {
 408                 if (strlen(dev_list[i]->name) == namelen &&
 409                     !strncmp(device, dev_list[i]->name, namelen)) {
 410                         *is_ours = 1;
 411
 412                         p = PCAP_CREATE_COMMON(ebuf, struct pcap_rdmasniff);
 413                         if (p) {
 414                                 p->activate_op = rdmasniff_activate;
 415                                 priv = p->priv;
 416                                 priv->rdma_device = dev_list[i];
 417                                 priv->port_num = port_num;
 418                         }
 419                         break;
 420                 }
 421         }
 422
 423         ibv_free_device_list(dev_list);
 424         return p;
 425 }
 426
 427 int
 428 rdmasniff_findalldevs(pcap_if_list_t *devlistp, char *err_str)
 429 {
 430         struct ibv_device **dev_list;
 431         int numdev;
 432         int i;
 433         int ret = 0;
 434
 435         dev_list = ibv_get_device_list(&numdev);
 436         if (!dev_list) {
 437                 return 0;
 438         }
 439
 440         for (i = 0; i < numdev; ++i) {
 441                 /*
 442                  * XXX - do the notions of "up", "running", or
 443                  * "connected" apply here?
 444                  */
 445                 if (!pcapint_add_dev(devlistp, dev_list[i]->name, 0, "RDMA sniffer", err_str)) {
 446                         ret = -1;
 447                         break;
 448                 }
 449         }
 450
 451         ibv_free_device_list(dev_list);
 452         return ret;
 453 }