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 * next, u16 gso_size)
  80 {
  81   u8 l4_hdr_sz = 0;
  82
  83   if (gso_size)
  84     {
  85       if (rx_comp->flags & VMXNET3_RXCF_TCP)
  86         {
  87           tcp_header_t *tcp =
  88             (tcp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
  89           l4_hdr_sz = tcp_header_bytes (tcp);
  90         }
  91       else if (rx_comp->flags & VMXNET3_RXCF_UDP)
  92         {
  93           udp_header_t *udp =
  94             (udp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
  95           l4_hdr_sz = sizeof (*udp);
  96         }
  97     }
  98
  99   if (rx_comp->flags & VMXNET3_RXCF_IP4)
 100     {
 101       ip4_header_t *ip4 = (ip4_header_t *) (hb->data +
 102                                             sizeof (ethernet_header_t));
 103
 104       vnet_buffer (hb)->l2_hdr_offset = 0;
 105       vnet_buffer (hb)->l3_hdr_offset = sizeof (ethernet_header_t);
 106       vnet_buffer (hb)->l4_hdr_offset = sizeof (ethernet_header_t) +
 107         ip4_header_bytes (ip4);
 108       hb->flags |= VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
 109         VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
 110         VNET_BUFFER_F_L4_HDR_OFFSET_VALID | VNET_BUFFER_F_IS_IP4;
 111       next[0] = VNET_DEVICE_INPUT_NEXT_IP4_NCS_INPUT;
 112
 113       /* checksum offload */
 114       if (!(rx_comp->index & VMXNET3_RXCI_CNC))
 115         {
 116           if (!(rx_comp->flags & VMXNET3_RXCF_IPC))
 117             {
 118               hb->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
 119               ip4->checksum = 0;
 120             }
 121           if (!(rx_comp->flags & VMXNET3_RXCF_TUC))
 122             {
 123               if (rx_comp->flags & VMXNET3_RXCF_TCP)
 124                 {
 125                   tcp_header_t *tcp =
 126                     (tcp_header_t *) (hb->data +
 127                                       vnet_buffer (hb)->l4_hdr_offset);
 128                   hb->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
 129                   tcp->checksum = 0;
 130                 }
 131               else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 132                 {
 133                   udp_header_t *udp =
 134                     (udp_header_t *) (hb->data +
 135                                       vnet_buffer (hb)->l4_hdr_offset);
 136                   hb->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
 137                   udp->checksum = 0;
 138                 }
 139             }
 140         }
 141
 142       if (gso_size)
 143         {
 144           vnet_buffer2 (hb)->gso_size = gso_size;
 145           vnet_buffer2 (hb)->gso_l4_hdr_sz = l4_hdr_sz;
 146           hb->flags |= VNET_BUFFER_F_GSO;
 147         }
 148       vlib_buffer_advance (hb, device_input_next_node_advance[next[0]]);
 149     }
 150   else if (rx_comp->flags & VMXNET3_RXCF_IP6)
 151     {
 152       vnet_buffer (hb)->l2_hdr_offset = 0;
 153       vnet_buffer (hb)->l3_hdr_offset = sizeof (ethernet_header_t);
 154       vnet_buffer (hb)->l4_hdr_offset = sizeof (ethernet_header_t) +
 155         sizeof (ip6_header_t);
 156       hb->flags |= VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
 157         VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
 158         VNET_BUFFER_F_L4_HDR_OFFSET_VALID | VNET_BUFFER_F_IS_IP6;
 159       next[0] = VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
 160
 161       /* checksum offload */
 162       if (!(rx_comp->index & VMXNET3_RXCI_CNC))
 163         {
 164           if (!(rx_comp->flags & VMXNET3_RXCF_TUC))
 165             {
 166               if (rx_comp->flags & VMXNET3_RXCF_TCP)
 167                 {
 168                   tcp_header_t *tcp =
 169                     (tcp_header_t *) (hb->data +
 170                                       vnet_buffer (hb)->l4_hdr_offset);
 171                   hb->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
 172                   tcp->checksum = 0;
 173                 }
 174               else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 175                 {
 176                   udp_header_t *udp =
 177                     (udp_header_t *) (hb->data +
 178                                       vnet_buffer (hb)->l4_hdr_offset);
 179                   hb->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
 180                   udp->checksum = 0;
 181                 }
 182             }
 183         }
 184
 185       if (gso_size)
 186         {
 187           vnet_buffer2 (hb)->gso_size = gso_size;
 188           vnet_buffer2 (hb)->gso_l4_hdr_sz = l4_hdr_sz;
 189           hb->flags |= VNET_BUFFER_F_GSO;
 190         }
 191       vlib_buffer_advance (hb, device_input_next_node_advance[next[0]]);
 192     }
 193   else
 194     next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 195 }
 196
 197 static_always_inline uword
 198 vmxnet3_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 199                              vlib_frame_t * frame, vmxnet3_device_t * vd,
 200                              u16 qid)
 201 {
 202   vnet_main_t *vnm = vnet_get_main ();
 203   uword n_trace = vlib_get_trace_count (vm, node);
 204   u32 n_rx_packets = 0, n_rx_bytes = 0;
 205   vmxnet3_rx_comp *rx_comp;
 206   u32 desc_idx;
 207   vmxnet3_rxq_t *rxq;
 208   u32 thread_index = vm->thread_index;
 209   u32 buffer_indices[VLIB_FRAME_SIZE], *bi;
 210   u16 nexts[VLIB_FRAME_SIZE], *next;
 211   vmxnet3_rx_ring *ring;
 212   vmxnet3_rx_comp_ring *comp_ring;
 213   u16 rid;
 214   vlib_buffer_t *prev_b0 = 0, *hb = 0;
 215   u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 216   u8 known_next = 0, got_packet = 0;
 217   vmxnet3_rx_desc *rxd;
 218   clib_error_t *error;
 219   u16 gso_size = 0;
 220
 221   rxq = vec_elt_at_index (vd->rxqs, qid);
 222   comp_ring = &rxq->rx_comp_ring;
 223   bi = buffer_indices;
 224   next = nexts;
 225   rx_comp = &rxq->rx_comp[comp_ring->next];
 226
 227   while (PREDICT_TRUE ((n_rx_packets < VLIB_FRAME_SIZE) &&
 228                        (comp_ring->gen ==
 229                         (rx_comp->flags & VMXNET3_RXCF_GEN))))
 230     {
 231       vlib_buffer_t *b0;
 232       u32 bi0;
 233
 234       rid = vmxnet3_find_rid (vd, rx_comp);
 235       ring = &rxq->rx_ring[rid];
 236
 237       if (PREDICT_TRUE (ring->fill >= 1))
 238         ring->fill--;
 239       else
 240         {
 241           vlib_error_count (vm, node->node_index,
 242                             VMXNET3_INPUT_ERROR_NO_BUFFER, 1);
 243           if (hb)
 244             {
 245               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 246               hb = 0;
 247             }
 248           prev_b0 = 0;
 249           break;
 250         }
 251
 252       desc_idx = rx_comp->index & VMXNET3_RXC_INDEX;
 253       ring->consume = desc_idx;
 254       rxd = &rxq->rx_desc[rid][desc_idx];
 255
 256       bi0 = ring->bufs[desc_idx];
 257       ring->bufs[desc_idx] = ~0;
 258
 259       b0 = vlib_get_buffer (vm, bi0);
 260       vnet_buffer (b0)->sw_if_index[VLIB_RX] = vd->sw_if_index;
 261       vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 262       vnet_buffer (b0)->feature_arc_index = 0;
 263       b0->current_length = rx_comp->len & VMXNET3_RXCL_LEN_MASK;
 264       b0->current_data = 0;
 265       b0->total_length_not_including_first_buffer = 0;
 266       b0->next_buffer = 0;
 267       b0->flags = 0;
 268       b0->error = 0;
 269       b0->current_config_index = 0;
 270       ASSERT (b0->current_length != 0);
 271
 272       if (PREDICT_FALSE ((rx_comp->index & VMXNET3_RXCI_EOP) &&
 273                          (rx_comp->len & VMXNET3_RXCL_ERROR)))
 274         {
 275           vlib_buffer_free_one (vm, bi0);
 276           vlib_error_count (vm, node->node_index,
 277                             VMXNET3_INPUT_ERROR_RX_PACKET_EOP, 1);
 278           if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 279             {
 280               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 281               hb = 0;
 282             }
 283           prev_b0 = 0;
 284           goto next;
 285         }
 286
 287       if (rx_comp->index & VMXNET3_RXCI_SOP)
 288         {
 289           ASSERT (!(rxd->flags & VMXNET3_RXF_BTYPE));
 290           /* start segment */
 291           if ((vd->lro_enable) &&
 292               (rx_comp->flags & VMXNET3_RXCF_CT) == VMXNET3_RXCOMP_TYPE_LRO)
 293             {
 294               vmxnet3_rx_comp_ext *lro = (vmxnet3_rx_comp_ext *) rx_comp;
 295
 296               gso_size = lro->flags & VMXNET3_RXECF_MSS_MASK;
 297             }
 298
 299           hb = b0;
 300           bi[0] = bi0;
 301           if (!(rx_comp->index & VMXNET3_RXCI_EOP))
 302             {
 303               hb->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
 304               prev_b0 = b0;
 305             }
 306           else
 307             {
 308               /*
 309                * Both start and end of packet is set. It is a complete packet
 310                */
 311               prev_b0 = 0;
 312               got_packet = 1;
 313             }
 314         }
 315       else if (rx_comp->index & VMXNET3_RXCI_EOP)
 316         {
 317           /* end of segment */
 318           if (prev_b0)
 319             {
 320               prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 321               prev_b0->next_buffer = bi0;
 322               hb->total_length_not_including_first_buffer +=
 323                 b0->current_length;
 324               prev_b0 = 0;
 325               got_packet = 1;
 326             }
 327           else
 328             {
 329               /* EOP without SOP, error */
 330               vlib_error_count (vm, node->node_index,
 331                                 VMXNET3_INPUT_ERROR_RX_PACKET_NO_SOP, 1);
 332               vlib_buffer_free_one (vm, bi0);
 333               if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 334                 {
 335                   vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 336                   hb = 0;
 337                 }
 338               goto next;
 339             }
 340         }
 341       else if (prev_b0)         // !sop && !eop
 342         {
 343           /* mid chain */
 344           ASSERT (rxd->flags & VMXNET3_RXF_BTYPE);
 345           prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 346           prev_b0->next_buffer = bi0;
 347           prev_b0 = b0;
 348           hb->total_length_not_including_first_buffer += b0->current_length;
 349         }
 350       else
 351         {
 352           vlib_error_count (vm, node->node_index,
 353                             VMXNET3_INPUT_ERROR_RX_PACKET, 1);
 354           vlib_buffer_free_one (vm, bi0);
 355           if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 356             {
 357               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 358               hb = 0;
 359             }
 360           goto next;
 361         }
 362
 363       n_rx_bytes += b0->current_length;
 364
 365       if (got_packet)
 366         {
 367           if (PREDICT_FALSE (vd->per_interface_next_index != ~0))
 368             {
 369               next_index = vd->per_interface_next_index;
 370               known_next = 1;
 371             }
 372
 373           if (PREDICT_FALSE
 374               (vnet_device_input_have_features (vd->sw_if_index)))
 375             {
 376               vnet_feature_start_device_input_x1 (vd->sw_if_index,
 377                                                   &next_index, hb);
 378               known_next = 1;
 379             }
 380
 381           if (PREDICT_FALSE (known_next))
 382             {
 383               next[0] = next_index;
 384             }
 385           else
 386             {
 387               ethernet_header_t *e = (ethernet_header_t *) hb->data;
 388
 389               if (ethernet_frame_is_tagged (e->type))
 390                 next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 391               else
 392                 vmxnet3_handle_offload (rx_comp, hb, next, gso_size);
 393             }
 394
 395           n_rx_packets++;
 396           next++;
 397           bi++;
 398           hb = 0;
 399           got_packet = 0;
 400           gso_size = 0;
 401         }
 402
 403     next:
 404       vmxnet3_rx_comp_ring_advance_next (rxq);
 405       rx_comp = &rxq->rx_comp[comp_ring->next];
 406     }
 407
 408   if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
 409     {
 410       u32 n_left = n_rx_packets;
 411
 412       bi = buffer_indices;
 413       next = nexts;
 414       while (n_trace && n_left)
 415         {
 416           vlib_buffer_t *b;
 417           vmxnet3_input_trace_t *tr;
 418
 419           b = vlib_get_buffer (vm, bi[0]);
 420           vlib_trace_buffer (vm, node, next[0], b, /* follow_chain */ 0);
 421           tr = vlib_add_trace (vm, node, b, sizeof (*tr));
 422           tr->next_index = next[0];
 423           tr->hw_if_index = vd->hw_if_index;
 424           tr->buffer = *b;
 425
 426           n_trace--;
 427           n_left--;
 428           bi++;
 429           next++;
 430         }
 431       vlib_set_trace_count (vm, node, n_trace);
 432     }
 433
 434   if (PREDICT_TRUE (n_rx_packets))
 435     {
 436       vlib_buffer_enqueue_to_next (vm, node, buffer_indices, nexts,
 437                                    n_rx_packets);
 438       vlib_increment_combined_counter
 439         (vnm->interface_main.combined_sw_if_counters +
 440          VNET_INTERFACE_COUNTER_RX, thread_index,
 441          vd->hw_if_index, n_rx_packets, n_rx_bytes);
 442     }
 443
 444   error = vmxnet3_rxq_refill_ring0 (vm, vd, rxq);
 445   if (PREDICT_FALSE (error != 0))
 446     {
 447       vlib_error_count (vm, node->node_index,
 448                         VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 449     }
 450   error = vmxnet3_rxq_refill_ring1 (vm, vd, rxq);
 451   if (PREDICT_FALSE (error != 0))
 452     {
 453       vlib_error_count (vm, node->node_index,
 454                         VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 455     }
 456
 457   return n_rx_packets;
 458 }
 459
 460 VLIB_NODE_FN (vmxnet3_input_node) (vlib_main_t * vm,
 461                                    vlib_node_runtime_t * node,
 462                                    vlib_frame_t * frame)
 463 {
 464   u32 n_rx = 0;
 465   vmxnet3_main_t *vmxm = &vmxnet3_main;
 466   vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
 467   vnet_device_and_queue_t *dq;
 468
 469   foreach_device_and_queue (dq, rt->devices_and_queues)
 470   {
 471     vmxnet3_device_t *vd;
 472     vd = vec_elt_at_index (vmxm->devices, dq->dev_instance);
 473     if ((vd->flags & VMXNET3_DEVICE_F_ADMIN_UP) == 0)
 474       continue;
 475     n_rx += vmxnet3_device_input_inline (vm, node, frame, vd, dq->queue_id);
 476   }
 477   return n_rx;
 478 }
 479
 480 #ifndef CLIB_MARCH_VARIANT
 481 /* *INDENT-OFF* */
 482 VLIB_REGISTER_NODE (vmxnet3_input_node) = {
 483   .name = "vmxnet3-input",
 484   .sibling_of = "device-input",
 485   .format_trace = format_vmxnet3_input_trace,
 486   .type = VLIB_NODE_TYPE_INPUT,
 487   .state = VLIB_NODE_STATE_DISABLED,
 488   .n_errors = VMXNET3_INPUT_N_ERROR,
 489   .error_strings = vmxnet3_input_error_strings,
 490 };
 491 #endif
 492
 493 /* *INDENT-ON* */
 494
 495 /*
 496  * fd.io coding-style-patch-verification: ON
 497  *
 498  * Local Variables:
 499  * eval: (c-set-style "gnu")
 500  * End:
 501  */