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
  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
  83   if (rx_comp->flags & VMXNET3_RXCF_IP4)
  84     {
  85       ip4_header_t *ip4 = (ip4_header_t *) (hb->data +
  86                                             sizeof (ethernet_header_t));
  87
  88       vnet_buffer (hb)->l2_hdr_offset = 0;
  89       vnet_buffer (hb)->l3_hdr_offset = sizeof (ethernet_header_t);
  90       vnet_buffer (hb)->l4_hdr_offset = sizeof (ethernet_header_t) +
  91         ip4_header_bytes (ip4);
  92       hb->flags |= VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
  93         VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
  94         VNET_BUFFER_F_L4_HDR_OFFSET_VALID | VNET_BUFFER_F_IS_IP4;
  95
  96       /* checksum offload */
  97       if (!(rx_comp->index & VMXNET3_RXCI_CNC))
  98         {
  99           if (!(rx_comp->flags & VMXNET3_RXCF_IPC))
 100             {
 101               hb->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
 102               ip4->checksum = 0;
 103             }
 104           if (!(rx_comp->flags & VMXNET3_RXCF_TUC))
 105             {
 106               if (rx_comp->flags & VMXNET3_RXCF_TCP)
 107                 {
 108                   tcp_header_t *tcp =
 109                     (tcp_header_t *) (hb->data +
 110                                       vnet_buffer (hb)->l4_hdr_offset);
 111                   hb->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
 112                   tcp->checksum = 0;
 113                 }
 114               else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 115                 {
 116                   udp_header_t *udp =
 117                     (udp_header_t *) (hb->data +
 118                                       vnet_buffer (hb)->l4_hdr_offset);
 119                   hb->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
 120                   udp->checksum = 0;
 121                 }
 122             }
 123         }
 124
 125       if (gso_size)
 126         {
 127           if (rx_comp->flags & VMXNET3_RXCF_TCP)
 128             {
 129               tcp_header_t *tcp =
 130                 (tcp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 131               l4_hdr_sz = tcp_header_bytes (tcp);
 132             }
 133           else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 134             {
 135               udp_header_t *udp =
 136                 (udp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 137               l4_hdr_sz = sizeof (*udp);
 138             }
 139           vnet_buffer2 (hb)->gso_size = gso_size;
 140           vnet_buffer2 (hb)->gso_l4_hdr_sz = l4_hdr_sz;
 141           hb->flags |= VNET_BUFFER_F_GSO;
 142         }
 143     }
 144   else if (rx_comp->flags & VMXNET3_RXCF_IP6)
 145     {
 146       vnet_buffer (hb)->l2_hdr_offset = 0;
 147       vnet_buffer (hb)->l3_hdr_offset = sizeof (ethernet_header_t);
 148       vnet_buffer (hb)->l4_hdr_offset = sizeof (ethernet_header_t) +
 149         sizeof (ip6_header_t);
 150       hb->flags |= VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
 151         VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
 152         VNET_BUFFER_F_L4_HDR_OFFSET_VALID | VNET_BUFFER_F_IS_IP6;
 153
 154       /* checksum offload */
 155       if (!(rx_comp->index & VMXNET3_RXCI_CNC))
 156         {
 157           if (!(rx_comp->flags & VMXNET3_RXCF_TUC))
 158             {
 159               if (rx_comp->flags & VMXNET3_RXCF_TCP)
 160                 {
 161                   tcp_header_t *tcp =
 162                     (tcp_header_t *) (hb->data +
 163                                       vnet_buffer (hb)->l4_hdr_offset);
 164                   hb->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
 165                   tcp->checksum = 0;
 166                 }
 167               else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 168                 {
 169                   udp_header_t *udp =
 170                     (udp_header_t *) (hb->data +
 171                                       vnet_buffer (hb)->l4_hdr_offset);
 172                   hb->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
 173                   udp->checksum = 0;
 174                 }
 175             }
 176         }
 177
 178       if (gso_size)
 179         {
 180           if (rx_comp->flags & VMXNET3_RXCF_TCP)
 181             {
 182               tcp_header_t *tcp =
 183                 (tcp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 184               l4_hdr_sz = tcp_header_bytes (tcp);
 185             }
 186           else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 187             {
 188               udp_header_t *udp =
 189                 (udp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 190               l4_hdr_sz = sizeof (*udp);
 191             }
 192           vnet_buffer2 (hb)->gso_size = gso_size;
 193           vnet_buffer2 (hb)->gso_l4_hdr_sz = l4_hdr_sz;
 194           hb->flags |= VNET_BUFFER_F_GSO;
 195         }
 196     }
 197 }
 198
 199 static_always_inline uword
 200 vmxnet3_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 201                              vlib_frame_t * frame, vmxnet3_device_t * vd,
 202                              u16 qid)
 203 {
 204   vnet_main_t *vnm = vnet_get_main ();
 205   uword n_trace = vlib_get_trace_count (vm, node);
 206   u32 n_rx_packets = 0, n_rx_bytes = 0;
 207   vmxnet3_rx_comp *rx_comp;
 208   u32 desc_idx;
 209   vmxnet3_rxq_t *rxq;
 210   u32 thread_index = vm->thread_index;
 211   u32 buffer_indices[VLIB_FRAME_SIZE], *bi;
 212   u16 nexts[VLIB_FRAME_SIZE], *next;
 213   vmxnet3_rx_ring *ring;
 214   vmxnet3_rx_comp_ring *comp_ring;
 215   u16 rid;
 216   vlib_buffer_t *prev_b0 = 0, *hb = 0;
 217   u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 218   u8 known_next = 0, got_packet = 0;
 219   vmxnet3_rx_desc *rxd;
 220   clib_error_t *error;
 221   u16 gso_size = 0;
 222
 223   rxq = vec_elt_at_index (vd->rxqs, qid);
 224   comp_ring = &rxq->rx_comp_ring;
 225   bi = buffer_indices;
 226   next = nexts;
 227   rx_comp = &rxq->rx_comp[comp_ring->next];
 228
 229   while (PREDICT_TRUE ((n_rx_packets < VLIB_FRAME_SIZE) &&
 230                        (comp_ring->gen ==
 231                         (rx_comp->flags & VMXNET3_RXCF_GEN))))
 232     {
 233       vlib_buffer_t *b0;
 234       u32 bi0;
 235
 236       rid = vmxnet3_find_rid (vd, rx_comp);
 237       ring = &rxq->rx_ring[rid];
 238
 239       if (PREDICT_TRUE (ring->fill >= 1))
 240         ring->fill--;
 241       else
 242         {
 243           vlib_error_count (vm, node->node_index,
 244                             VMXNET3_INPUT_ERROR_NO_BUFFER, 1);
 245           if (hb)
 246             {
 247               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 248               hb = 0;
 249             }
 250           prev_b0 = 0;
 251           break;
 252         }
 253
 254       desc_idx = rx_comp->index & VMXNET3_RXC_INDEX;
 255       ring->consume = desc_idx;
 256       rxd = &rxq->rx_desc[rid][desc_idx];
 257
 258       bi0 = ring->bufs[desc_idx];
 259       ring->bufs[desc_idx] = ~0;
 260
 261       b0 = vlib_get_buffer (vm, bi0);
 262       vnet_buffer (b0)->sw_if_index[VLIB_RX] = vd->sw_if_index;
 263       vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 264       vnet_buffer (b0)->feature_arc_index = 0;
 265       b0->current_length = rx_comp->len & VMXNET3_RXCL_LEN_MASK;
 266       b0->current_data = 0;
 267       b0->total_length_not_including_first_buffer = 0;
 268       b0->next_buffer = 0;
 269       b0->flags = 0;
 270       b0->error = 0;
 271       b0->current_config_index = 0;
 272       ASSERT (b0->current_length != 0);
 273
 274       if (PREDICT_FALSE ((rx_comp->index & VMXNET3_RXCI_EOP) &&
 275                          (rx_comp->len & VMXNET3_RXCL_ERROR)))
 276         {
 277           vlib_buffer_free_one (vm, bi0);
 278           vlib_error_count (vm, node->node_index,
 279                             VMXNET3_INPUT_ERROR_RX_PACKET_EOP, 1);
 280           if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 281             {
 282               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 283               hb = 0;
 284             }
 285           prev_b0 = 0;
 286           goto next;
 287         }
 288
 289       if (rx_comp->index & VMXNET3_RXCI_SOP)
 290         {
 291           ASSERT (!(rxd->flags & VMXNET3_RXF_BTYPE));
 292           /* start segment */
 293           if (vd->gso_enable &&
 294               (rx_comp->flags & VMXNET3_RXCF_CT) == VMXNET3_RXCOMP_TYPE_LRO)
 295             {
 296               vmxnet3_rx_comp_ext *lro = (vmxnet3_rx_comp_ext *) rx_comp;
 297
 298               gso_size = lro->flags & VMXNET3_RXECF_MSS_MASK;
 299             }
 300
 301           hb = b0;
 302           bi[0] = bi0;
 303           if (!(rx_comp->index & VMXNET3_RXCI_EOP))
 304             {
 305               hb->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
 306               prev_b0 = b0;
 307             }
 308           else
 309             {
 310               /*
 311                * Both start and end of packet is set. It is a complete packet
 312                */
 313               prev_b0 = 0;
 314               got_packet = 1;
 315             }
 316         }
 317       else if (rx_comp->index & VMXNET3_RXCI_EOP)
 318         {
 319           /* end of segment */
 320           if (prev_b0)
 321             {
 322               prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 323               prev_b0->next_buffer = bi0;
 324               hb->total_length_not_including_first_buffer +=
 325                 b0->current_length;
 326               prev_b0 = 0;
 327               got_packet = 1;
 328             }
 329           else
 330             {
 331               /* EOP without SOP, error */
 332               vlib_error_count (vm, node->node_index,
 333                                 VMXNET3_INPUT_ERROR_RX_PACKET_NO_SOP, 1);
 334               vlib_buffer_free_one (vm, bi0);
 335               if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 336                 {
 337                   vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 338                   hb = 0;
 339                 }
 340               goto next;
 341             }
 342         }
 343       else if (prev_b0)         // !sop && !eop
 344         {
 345           /* mid chain */
 346           ASSERT (rxd->flags & VMXNET3_RXF_BTYPE);
 347           prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 348           prev_b0->next_buffer = bi0;
 349           prev_b0 = b0;
 350           hb->total_length_not_including_first_buffer += b0->current_length;
 351         }
 352       else
 353         {
 354           vlib_error_count (vm, node->node_index,
 355                             VMXNET3_INPUT_ERROR_RX_PACKET, 1);
 356           vlib_buffer_free_one (vm, bi0);
 357           if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 358             {
 359               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 360               hb = 0;
 361             }
 362           goto next;
 363         }
 364
 365       n_rx_bytes += b0->current_length;
 366
 367       if (got_packet)
 368         {
 369           if (PREDICT_FALSE (vd->per_interface_next_index != ~0))
 370             {
 371               next_index = vd->per_interface_next_index;
 372               known_next = 1;
 373             }
 374
 375           if (PREDICT_FALSE
 376               (vnet_device_input_have_features (vd->sw_if_index)))
 377             {
 378               vnet_feature_start_device_input_x1 (vd->sw_if_index,
 379                                                   &next_index, hb);
 380               known_next = 1;
 381             }
 382
 383           if (PREDICT_FALSE (known_next))
 384             next[0] = next_index;
 385           else
 386             {
 387               ethernet_header_t *e = (ethernet_header_t *) hb->data;
 388
 389               next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 390               if (!ethernet_frame_is_tagged (e->type))
 391                 vmxnet3_handle_offload (rx_comp, hb, gso_size);
 392             }
 393
 394           n_rx_packets++;
 395           next++;
 396           bi++;
 397           hb = 0;
 398           got_packet = 0;
 399           gso_size = 0;
 400         }
 401
 402     next:
 403       vmxnet3_rx_comp_ring_advance_next (rxq);
 404       rx_comp = &rxq->rx_comp[comp_ring->next];
 405     }
 406
 407   if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
 408     {
 409       u32 n_left = n_rx_packets;
 410
 411       bi = buffer_indices;
 412       next = nexts;
 413       while (n_trace && n_left)
 414         {
 415           vlib_buffer_t *b;
 416           vmxnet3_input_trace_t *tr;
 417
 418           b = vlib_get_buffer (vm, bi[0]);
 419           vlib_trace_buffer (vm, node, next[0], b, /* follow_chain */ 0);
 420           tr = vlib_add_trace (vm, node, b, sizeof (*tr));
 421           tr->next_index = next[0];
 422           tr->hw_if_index = vd->hw_if_index;
 423           tr->buffer = *b;
 424
 425           n_trace--;
 426           n_left--;
 427           bi++;
 428           next++;
 429         }
 430       vlib_set_trace_count (vm, node, n_trace);
 431     }
 432
 433   if (PREDICT_TRUE (n_rx_packets))
 434     {
 435       vlib_buffer_enqueue_to_next (vm, node, buffer_indices, nexts,
 436                                    n_rx_packets);
 437       vlib_increment_combined_counter
 438         (vnm->interface_main.combined_sw_if_counters +
 439          VNET_INTERFACE_COUNTER_RX, thread_index,
 440          vd->hw_if_index, n_rx_packets, n_rx_bytes);
 441     }
 442
 443   error = vmxnet3_rxq_refill_ring0 (vm, vd, rxq);
 444   if (PREDICT_FALSE (error != 0))
 445     {
 446       vlib_error_count (vm, node->node_index,
 447                         VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 448     }
 449   error = vmxnet3_rxq_refill_ring1 (vm, vd, rxq);
 450   if (PREDICT_FALSE (error != 0))
 451     {
 452       vlib_error_count (vm, node->node_index,
 453                         VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 454     }
 455
 456   return n_rx_packets;
 457 }
 458
 459 VLIB_NODE_FN (vmxnet3_input_node) (vlib_main_t * vm,
 460                                    vlib_node_runtime_t * node,
 461                                    vlib_frame_t * frame)
 462 {
 463   u32 n_rx = 0;
 464   vmxnet3_main_t *vmxm = &vmxnet3_main;
 465   vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
 466   vnet_device_and_queue_t *dq;
 467
 468   foreach_device_and_queue (dq, rt->devices_and_queues)
 469   {
 470     vmxnet3_device_t *vd;
 471     vd = vec_elt_at_index (vmxm->devices, dq->dev_instance);
 472     if ((vd->flags & VMXNET3_DEVICE_F_ADMIN_UP) == 0)
 473       continue;
 474     n_rx += vmxnet3_device_input_inline (vm, node, frame, vd, dq->queue_id);
 475   }
 476   return n_rx;
 477 }
 478
 479 #ifndef CLIB_MARCH_VARIANT
 480 /* *INDENT-OFF* */
 481 VLIB_REGISTER_NODE (vmxnet3_input_node) = {
 482   .name = "vmxnet3-input",
 483   .sibling_of = "device-input",
 484   .format_trace = format_vmxnet3_input_trace,
 485   .type = VLIB_NODE_TYPE_INPUT,
 486   .state = VLIB_NODE_STATE_DISABLED,
 487   .n_errors = VMXNET3_INPUT_N_ERROR,
 488   .error_strings = vmxnet3_input_error_strings,
 489 };
 490 #endif
 491
 492 /* *INDENT-ON* */
 493
 494 /*
 495  * fd.io coding-style-patch-verification: ON
 496  *
 497  * Local Variables:
 498  * eval: (c-set-style "gnu")
 499  * End:
 500  */