src/plugins/vmxnet3/input.c

   1 /*
   2  *------------------------------------------------------------------
   3  * Copyright (c) 2018 Cisco and/or its affiliates.
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *------------------------------------------------------------------
  16  */
  17
  18 #include <vlib/vlib.h>
  19 #include <vlib/unix/unix.h>
  20 #include <vlib/pci/pci.h>
  21 #include <vnet/ethernet/ethernet.h>
  22 #include <vnet/devices/devices.h>
  23 #include <vnet/ip/ip6_packet.h>
  24 #include <vnet/ip/ip4_packet.h>
  25 #include <vnet/udp/udp_packet.h>
  26 #include <vnet/interface/rx_queue_funcs.h>
  27 #include <vmxnet3/vmxnet3.h>
  28
  29 #define foreach_vmxnet3_input_error \
  30   _(BUFFER_ALLOC, "buffer alloc error") \
  31   _(RX_PACKET_NO_SOP, "Rx packet error - no SOP") \
  32   _(RX_PACKET, "Rx packet error") \
  33   _(RX_PACKET_EOP, "Rx packet error found on EOP") \
  34   _(NO_BUFFER, "Rx no buffer error")
  35
  36 typedef enum
  37 {
  38 #define _(f,s) VMXNET3_INPUT_ERROR_##f,
  39   foreach_vmxnet3_input_error
  40 #undef _
  41     VMXNET3_INPUT_N_ERROR,
  42 } vmxnet3_input_error_t;
  43
  44 static __clib_unused char *vmxnet3_input_error_strings[] = {
  45 #define _(n,s) s,
  46   foreach_vmxnet3_input_error
  47 #undef _
  48 };
  49
  50 static_always_inline u16
  51 vmxnet3_find_rid (vmxnet3_device_t * vd, vmxnet3_rx_comp * rx_comp)
  52 {
  53   u32 rid;
  54
  55   // rid is bits 16-25 (10 bits number)
  56   rid = rx_comp->index & (0xffffffff >> 6);
  57   rid >>= 16;
  58   if ((rid >= vd->num_rx_queues) && (rid < (vd->num_rx_queues << 1)))
  59     return 1;
  60   else
  61     return 0;
  62 }
  63
  64 static_always_inline void
  65 vmxnet3_rx_comp_ring_advance_next (vmxnet3_rxq_t * rxq)
  66 {
  67   vmxnet3_rx_comp_ring *comp_ring = &rxq->rx_comp_ring;
  68
  69   comp_ring->next++;
  70   if (PREDICT_FALSE (comp_ring->next == rxq->size))
  71     {
  72       comp_ring->next = 0;
  73       comp_ring->gen ^= VMXNET3_RXCF_GEN;
  74     }
  75 }
  76
  77 static_always_inline void
  78 vmxnet3_handle_offload (vmxnet3_rx_comp * rx_comp, vlib_buffer_t * hb,
  79                         u16 gso_size)
  80 {
  81   u8 l4_hdr_sz = 0;
  82   u32 oflags = 0;
  83
  84   if (rx_comp->flags & VMXNET3_RXCF_IP4)
  85     {
  86       ip4_header_t *ip4 = (ip4_header_t *) (hb->data +
  87                                             sizeof (ethernet_header_t));
  88
  89       vnet_buffer (hb)->l2_hdr_offset = 0;
  90       vnet_buffer (hb)->l3_hdr_offset = sizeof (ethernet_header_t);
  91       vnet_buffer (hb)->l4_hdr_offset = sizeof (ethernet_header_t) +
  92         ip4_header_bytes (ip4);
  93       hb->flags |= VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
  94                    VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
  95                    VNET_BUFFER_F_L4_HDR_OFFSET_VALID | VNET_BUFFER_F_IS_IP4;
  96
  97       /* checksum offload */
  98       if (!(rx_comp->index & VMXNET3_RXCI_CNC))
  99         {
 100           if (!(rx_comp->flags & VMXNET3_RXCF_IPC))
 101             {
 102               oflags |= VNET_BUFFER_OFFLOAD_F_IP_CKSUM;
 103               ip4->checksum = 0;
 104             }
 105           if (!(rx_comp->flags & VMXNET3_RXCF_TUC))
 106             {
 107               if (rx_comp->flags & VMXNET3_RXCF_TCP)
 108                 {
 109                   tcp_header_t *tcp =
 110                     (tcp_header_t *) (hb->data +
 111                                       vnet_buffer (hb)->l4_hdr_offset);
 112                   oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
 113                   tcp->checksum = 0;
 114                 }
 115               else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 116                 {
 117                   udp_header_t *udp =
 118                     (udp_header_t *) (hb->data +
 119                                       vnet_buffer (hb)->l4_hdr_offset);
 120                   oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
 121                   udp->checksum = 0;
 122                 }
 123             }
 124         }
 125
 126       if (gso_size)
 127         {
 128           if (rx_comp->flags & VMXNET3_RXCF_TCP)
 129             {
 130               tcp_header_t *tcp =
 131                 (tcp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 132               l4_hdr_sz = tcp_header_bytes (tcp);
 133             }
 134           else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 135             {
 136               udp_header_t *udp =
 137                 (udp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 138               l4_hdr_sz = sizeof (*udp);
 139             }
 140           vnet_buffer2 (hb)->gso_size = gso_size;
 141           vnet_buffer2 (hb)->gso_l4_hdr_sz = l4_hdr_sz;
 142           hb->flags |= VNET_BUFFER_F_GSO;
 143         }
 144     }
 145   else if (rx_comp->flags & VMXNET3_RXCF_IP6)
 146     {
 147       vnet_buffer (hb)->l2_hdr_offset = 0;
 148       vnet_buffer (hb)->l3_hdr_offset = sizeof (ethernet_header_t);
 149       vnet_buffer (hb)->l4_hdr_offset = sizeof (ethernet_header_t) +
 150         sizeof (ip6_header_t);
 151       hb->flags |= VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
 152                    VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
 153                    VNET_BUFFER_F_L4_HDR_OFFSET_VALID | VNET_BUFFER_F_IS_IP6;
 154
 155       /* checksum offload */
 156       if (!(rx_comp->index & VMXNET3_RXCI_CNC))
 157         {
 158           if (!(rx_comp->flags & VMXNET3_RXCF_TUC))
 159             {
 160               if (rx_comp->flags & VMXNET3_RXCF_TCP)
 161                 {
 162                   tcp_header_t *tcp =
 163                     (tcp_header_t *) (hb->data +
 164                                       vnet_buffer (hb)->l4_hdr_offset);
 165                   oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
 166                   tcp->checksum = 0;
 167                 }
 168               else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 169                 {
 170                   udp_header_t *udp =
 171                     (udp_header_t *) (hb->data +
 172                                       vnet_buffer (hb)->l4_hdr_offset);
 173                   oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
 174                   udp->checksum = 0;
 175                 }
 176             }
 177         }
 178
 179       if (gso_size)
 180         {
 181           if (rx_comp->flags & VMXNET3_RXCF_TCP)
 182             {
 183               tcp_header_t *tcp =
 184                 (tcp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 185               l4_hdr_sz = tcp_header_bytes (tcp);
 186             }
 187           else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 188             {
 189               udp_header_t *udp =
 190                 (udp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 191               l4_hdr_sz = sizeof (*udp);
 192             }
 193           vnet_buffer2 (hb)->gso_size = gso_size;
 194           vnet_buffer2 (hb)->gso_l4_hdr_sz = l4_hdr_sz;
 195           hb->flags |= VNET_BUFFER_F_GSO;
 196         }
 197     }
 198   if (oflags)
 199     vnet_buffer_offload_flags_set (hb, oflags);
 200 }
 201
 202 static_always_inline uword
 203 vmxnet3_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 204                              vlib_frame_t * frame, vmxnet3_device_t * vd,
 205                              u16 qid)
 206 {
 207   vnet_main_t *vnm = vnet_get_main ();
 208   uword n_trace = vlib_get_trace_count (vm, node);
 209   u32 n_rx_packets = 0, n_rx_bytes = 0;
 210   vmxnet3_rx_comp *rx_comp;
 211   u32 desc_idx;
 212   vmxnet3_rxq_t *rxq;
 213   u32 thread_index = vm->thread_index;
 214   u32 buffer_indices[VLIB_FRAME_SIZE], *bi;
 215   u16 nexts[VLIB_FRAME_SIZE], *next;
 216   vmxnet3_rx_ring *ring;
 217   vmxnet3_rx_comp_ring *comp_ring;
 218   u16 rid;
 219   vlib_buffer_t *prev_b0 = 0, *hb = 0;
 220   u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 221   u8 known_next = 0, got_packet = 0;
 222   vmxnet3_rx_desc *rxd;
 223   clib_error_t *error;
 224   u16 gso_size = 0;
 225
 226   rxq = vec_elt_at_index (vd->rxqs, qid);
 227   comp_ring = &rxq->rx_comp_ring;
 228   bi = buffer_indices;
 229   next = nexts;
 230   rx_comp = &rxq->rx_comp[comp_ring->next];
 231
 232   while (PREDICT_TRUE ((n_rx_packets < VLIB_FRAME_SIZE) &&
 233                        (comp_ring->gen ==
 234                         (rx_comp->flags & VMXNET3_RXCF_GEN))))
 235     {
 236       vlib_buffer_t *b0;
 237       u32 bi0;
 238
 239       rid = vmxnet3_find_rid (vd, rx_comp);
 240       ring = &rxq->rx_ring[rid];
 241
 242       if (PREDICT_TRUE (ring->fill >= 1))
 243         ring->fill--;
 244       else
 245         {
 246           vlib_error_count (vm, node->node_index,
 247                             VMXNET3_INPUT_ERROR_NO_BUFFER, 1);
 248           if (hb)
 249             {
 250               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 251               hb = 0;
 252             }
 253           prev_b0 = 0;
 254           break;
 255         }
 256
 257       desc_idx = rx_comp->index & VMXNET3_RXC_INDEX;
 258       ring->consume = desc_idx;
 259       rxd = &rxq->rx_desc[rid][desc_idx];
 260
 261       bi0 = ring->bufs[desc_idx];
 262       ring->bufs[desc_idx] = ~0;
 263
 264       b0 = vlib_get_buffer (vm, bi0);
 265       vnet_buffer (b0)->sw_if_index[VLIB_RX] = vd->sw_if_index;
 266       vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 267       vnet_buffer (b0)->feature_arc_index = 0;
 268       b0->current_length = rx_comp->len & VMXNET3_RXCL_LEN_MASK;
 269       b0->current_data = 0;
 270       b0->total_length_not_including_first_buffer = 0;
 271       b0->next_buffer = 0;
 272       b0->flags = 0;
 273       b0->error = 0;
 274       b0->current_config_index = 0;
 275
 276       if (PREDICT_FALSE ((rx_comp->index & VMXNET3_RXCI_EOP) &&
 277                          (rx_comp->len & VMXNET3_RXCL_ERROR)))
 278         {
 279           vlib_buffer_free_one (vm, bi0);
 280           vlib_error_count (vm, node->node_index,
 281                             VMXNET3_INPUT_ERROR_RX_PACKET_EOP, 1);
 282           if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 283             {
 284               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 285               hb = 0;
 286             }
 287           prev_b0 = 0;
 288           goto next;
 289         }
 290
 291       if (rx_comp->index & VMXNET3_RXCI_SOP)
 292         {
 293           ASSERT (!(rxd->flags & VMXNET3_RXF_BTYPE));
 294           /* start segment */
 295           if (vd->gso_enable &&
 296               (rx_comp->flags & VMXNET3_RXCF_CT) == VMXNET3_RXCOMP_TYPE_LRO)
 297             {
 298               vmxnet3_rx_comp_ext *lro = (vmxnet3_rx_comp_ext *) rx_comp;
 299
 300               gso_size = lro->flags & VMXNET3_RXECF_MSS_MASK;
 301             }
 302
 303           hb = b0;
 304           bi[0] = bi0;
 305           if (!(rx_comp->index & VMXNET3_RXCI_EOP))
 306             {
 307               hb->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
 308               prev_b0 = b0;
 309             }
 310           else
 311             {
 312               /*
 313                * Both start and end of packet is set. It is a complete packet
 314                */
 315               prev_b0 = 0;
 316               got_packet = 1;
 317             }
 318         }
 319       else if (rx_comp->index & VMXNET3_RXCI_EOP)
 320         {
 321           /* end of segment */
 322           if (PREDICT_TRUE (prev_b0 != 0))
 323             {
 324               if (PREDICT_TRUE (b0->current_length != 0))
 325                 {
 326                   prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 327                   prev_b0->next_buffer = bi0;
 328                   hb->total_length_not_including_first_buffer +=
 329                     b0->current_length;
 330                 }
 331               else
 332                 {
 333                   vlib_buffer_free_one (vm, bi0);
 334                 }
 335               prev_b0 = 0;
 336               got_packet = 1;
 337             }
 338           else
 339             {
 340               /* EOP without SOP, error */
 341               vlib_error_count (vm, node->node_index,
 342                                 VMXNET3_INPUT_ERROR_RX_PACKET_NO_SOP, 1);
 343               vlib_buffer_free_one (vm, bi0);
 344               if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 345                 {
 346                   vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 347                   hb = 0;
 348                 }
 349               goto next;
 350             }
 351         }
 352       else if (prev_b0)         // !sop && !eop
 353         {
 354           /* mid chain */
 355           ASSERT (rxd->flags & VMXNET3_RXF_BTYPE);
 356           prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 357           prev_b0->next_buffer = bi0;
 358           prev_b0 = b0;
 359           hb->total_length_not_including_first_buffer += b0->current_length;
 360         }
 361       else
 362         {
 363           vlib_error_count (vm, node->node_index,
 364                             VMXNET3_INPUT_ERROR_RX_PACKET, 1);
 365           vlib_buffer_free_one (vm, bi0);
 366           if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 367             {
 368               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 369               hb = 0;
 370             }
 371           goto next;
 372         }
 373
 374       n_rx_bytes += b0->current_length;
 375
 376       if (got_packet)
 377         {
 378           if (PREDICT_FALSE (vd->per_interface_next_index != ~0))
 379             {
 380               next_index = vd->per_interface_next_index;
 381               known_next = 1;
 382             }
 383
 384           if (PREDICT_FALSE
 385               (vnet_device_input_have_features (vd->sw_if_index)))
 386             {
 387               vnet_feature_start_device_input_x1 (vd->sw_if_index,
 388                                                   &next_index, hb);
 389               known_next = 1;
 390             }
 391
 392           if (PREDICT_FALSE (known_next))
 393             next[0] = next_index;
 394           else
 395             {
 396               ethernet_header_t *e = (ethernet_header_t *) hb->data;
 397
 398               next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 399               if (!ethernet_frame_is_tagged (ntohs (e->type)))
 400                 vmxnet3_handle_offload (rx_comp, hb, gso_size);
 401             }
 402
 403           n_rx_packets++;
 404           next++;
 405           bi++;
 406           hb = 0;
 407           got_packet = 0;
 408           gso_size = 0;
 409         }
 410
 411     next:
 412       vmxnet3_rx_comp_ring_advance_next (rxq);
 413       rx_comp = &rxq->rx_comp[comp_ring->next];
 414     }
 415
 416   if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
 417     {
 418       u32 n_left = n_rx_packets;
 419
 420       bi = buffer_indices;
 421       next = nexts;
 422       while (n_trace && n_left)
 423         {
 424           vlib_buffer_t *b = vlib_get_buffer (vm, bi[0]);
 425           if (PREDICT_TRUE
 426               (vlib_trace_buffer
 427                (vm, node, next[0], b, /* follow_chain */ 0)))
 428             {
 429               vmxnet3_input_trace_t *tr =
 430                 vlib_add_trace (vm, node, b, sizeof (*tr));
 431               tr->next_index = next[0];
 432               tr->hw_if_index = vd->hw_if_index;
 433               tr->buffer = *b;
 434               n_trace--;
 435             }
 436           n_left--;
 437           bi++;
 438           next++;
 439         }
 440       vlib_set_trace_count (vm, node, n_trace);
 441     }
 442
 443   if (PREDICT_TRUE (n_rx_packets))
 444     {
 445       vlib_buffer_enqueue_to_next (vm, node, buffer_indices, nexts,
 446                                    n_rx_packets);
 447       vlib_increment_combined_counter
 448         (vnm->interface_main.combined_sw_if_counters +
 449          VNET_INTERFACE_COUNTER_RX, thread_index,
 450          vd->sw_if_index, n_rx_packets, n_rx_bytes);
 451     }
 452
 453   error = vmxnet3_rxq_refill_ring0 (vm, vd, rxq);
 454   if (PREDICT_FALSE (error != 0))
 455     {
 456       vlib_error_count (vm, node->node_index,
 457                         VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 458     }
 459   error = vmxnet3_rxq_refill_ring1 (vm, vd, rxq);
 460   if (PREDICT_FALSE (error != 0))
 461     {
 462       vlib_error_count (vm, node->node_index,
 463                         VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 464     }
 465
 466   return n_rx_packets;
 467 }
 468
 469 VLIB_NODE_FN (vmxnet3_input_node) (vlib_main_t * vm,
 470                                    vlib_node_runtime_t * node,
 471                                    vlib_frame_t * frame)
 472 {
 473   u32 n_rx = 0;
 474   vmxnet3_main_t *vmxm = &vmxnet3_main;
 475   vnet_hw_if_rxq_poll_vector_t *pv = vnet_hw_if_get_rxq_poll_vector (vm, node);
 476   vnet_hw_if_rxq_poll_vector_t *pve;
 477
 478   vec_foreach (pve, pv)
 479     {
 480       vmxnet3_device_t *vd;
 481       vd = vec_elt_at_index (vmxm->devices, pve->dev_instance);
 482       if ((vd->flags & VMXNET3_DEVICE_F_ADMIN_UP) == 0)
 483         continue;
 484       n_rx += vmxnet3_device_input_inline (vm, node, frame, vd, pve->queue_id);
 485     }
 486   return n_rx;
 487 }
 488
 489 #ifndef CLIB_MARCH_VARIANT
 490 /* *INDENT-OFF* */
 491 VLIB_REGISTER_NODE (vmxnet3_input_node) = {
 492   .name = "vmxnet3-input",
 493   .sibling_of = "device-input",
 494   .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
 495   .format_trace = format_vmxnet3_input_trace,
 496   .type = VLIB_NODE_TYPE_INPUT,
 497   .state = VLIB_NODE_STATE_DISABLED,
 498   .n_errors = VMXNET3_INPUT_N_ERROR,
 499   .error_strings = vmxnet3_input_error_strings,
 500 };
 501 #endif
 502
 503 /* *INDENT-ON* */
 504
 505 /*
 506  * fd.io coding-style-patch-verification: ON
 507  *
 508  * Local Variables:
 509  * eval: (c-set-style "gnu")
 510  * End:
 511  */