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   vnet_buffer_oflags_t 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                   oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
 110                 }
 111               else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 112                 {
 113                   oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
 114                 }
 115             }
 116         }
 117
 118       if (gso_size)
 119         {
 120           if (rx_comp->flags & VMXNET3_RXCF_TCP)
 121             {
 122               tcp_header_t *tcp =
 123                 (tcp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 124               l4_hdr_sz = tcp_header_bytes (tcp);
 125             }
 126           else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 127             {
 128               udp_header_t *udp =
 129                 (udp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 130               l4_hdr_sz = sizeof (*udp);
 131             }
 132           vnet_buffer2 (hb)->gso_size = gso_size;
 133           vnet_buffer2 (hb)->gso_l4_hdr_sz = l4_hdr_sz;
 134           hb->flags |= VNET_BUFFER_F_GSO;
 135         }
 136     }
 137   else if (rx_comp->flags & VMXNET3_RXCF_IP6)
 138     {
 139       vnet_buffer (hb)->l2_hdr_offset = 0;
 140       vnet_buffer (hb)->l3_hdr_offset = sizeof (ethernet_header_t);
 141       vnet_buffer (hb)->l4_hdr_offset = sizeof (ethernet_header_t) +
 142         sizeof (ip6_header_t);
 143       hb->flags |= VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
 144                    VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
 145                    VNET_BUFFER_F_L4_HDR_OFFSET_VALID | VNET_BUFFER_F_IS_IP6;
 146
 147       /* checksum offload */
 148       if (!(rx_comp->index & VMXNET3_RXCI_CNC))
 149         {
 150           if (!(rx_comp->flags & VMXNET3_RXCF_TUC))
 151             {
 152               if (rx_comp->flags & VMXNET3_RXCF_TCP)
 153                 {
 154                   tcp_header_t *tcp =
 155                     (tcp_header_t *) (hb->data +
 156                                       vnet_buffer (hb)->l4_hdr_offset);
 157                   oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
 158                   tcp->checksum = 0;
 159                 }
 160               else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 161                 {
 162                   udp_header_t *udp =
 163                     (udp_header_t *) (hb->data +
 164                                       vnet_buffer (hb)->l4_hdr_offset);
 165                   oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
 166                   udp->checksum = 0;
 167                 }
 168             }
 169         }
 170
 171       if (gso_size)
 172         {
 173           if (rx_comp->flags & VMXNET3_RXCF_TCP)
 174             {
 175               tcp_header_t *tcp =
 176                 (tcp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 177               l4_hdr_sz = tcp_header_bytes (tcp);
 178             }
 179           else if (rx_comp->flags & VMXNET3_RXCF_UDP)
 180             {
 181               udp_header_t *udp =
 182                 (udp_header_t *) (hb->data + vnet_buffer (hb)->l4_hdr_offset);
 183               l4_hdr_sz = sizeof (*udp);
 184             }
 185           vnet_buffer2 (hb)->gso_size = gso_size;
 186           vnet_buffer2 (hb)->gso_l4_hdr_sz = l4_hdr_sz;
 187           hb->flags |= VNET_BUFFER_F_GSO;
 188         }
 189     }
 190   if (oflags)
 191     vnet_buffer_offload_flags_set (hb, oflags);
 192 }
 193
 194 static_always_inline uword
 195 vmxnet3_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 196                              vlib_frame_t * frame, vmxnet3_device_t * vd,
 197                              u16 qid)
 198 {
 199   vnet_main_t *vnm = vnet_get_main ();
 200   uword n_trace = vlib_get_trace_count (vm, node);
 201   u32 n_rx_packets = 0, n_rx_bytes = 0;
 202   vmxnet3_rx_comp *rx_comp;
 203   u32 desc_idx;
 204   vmxnet3_rxq_t *rxq;
 205   u32 thread_index = vm->thread_index;
 206   u32 buffer_indices[VLIB_FRAME_SIZE], *bi;
 207   u16 nexts[VLIB_FRAME_SIZE], *next;
 208   vmxnet3_rx_ring *ring;
 209   vmxnet3_rx_comp_ring *comp_ring;
 210   u16 rid;
 211   vlib_buffer_t *prev_b0 = 0, *hb = 0;
 212   u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 213   u8 known_next = 0, got_packet = 0;
 214   vmxnet3_rx_desc *rxd;
 215   clib_error_t *error;
 216   u16 gso_size = 0;
 217
 218   rxq = vec_elt_at_index (vd->rxqs, qid);
 219   comp_ring = &rxq->rx_comp_ring;
 220   bi = buffer_indices;
 221   next = nexts;
 222   rx_comp = &rxq->rx_comp[comp_ring->next];
 223
 224   while (PREDICT_TRUE ((n_rx_packets < VLIB_FRAME_SIZE) &&
 225                        (comp_ring->gen ==
 226                         (rx_comp->flags & VMXNET3_RXCF_GEN))))
 227     {
 228       vlib_buffer_t *b0;
 229       u32 bi0;
 230
 231       rid = vmxnet3_find_rid (vd, rx_comp);
 232       ring = &rxq->rx_ring[rid];
 233
 234       if (PREDICT_TRUE (ring->fill >= 1))
 235         ring->fill--;
 236       else
 237         {
 238           vlib_error_count (vm, node->node_index,
 239                             VMXNET3_INPUT_ERROR_NO_BUFFER, 1);
 240           if (hb)
 241             {
 242               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 243               hb = 0;
 244             }
 245           prev_b0 = 0;
 246           break;
 247         }
 248
 249       desc_idx = rx_comp->index & VMXNET3_RXC_INDEX;
 250       ring->consume = desc_idx;
 251       rxd = &rxq->rx_desc[rid][desc_idx];
 252
 253       bi0 = ring->bufs[desc_idx];
 254       ring->bufs[desc_idx] = ~0;
 255
 256       b0 = vlib_get_buffer (vm, bi0);
 257       vnet_buffer (b0)->sw_if_index[VLIB_RX] = vd->sw_if_index;
 258       vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 259       vnet_buffer (b0)->feature_arc_index = 0;
 260       b0->current_length = rx_comp->len & VMXNET3_RXCL_LEN_MASK;
 261       b0->current_data = 0;
 262       b0->total_length_not_including_first_buffer = 0;
 263       b0->next_buffer = 0;
 264       b0->flags = 0;
 265       b0->error = 0;
 266       b0->current_config_index = 0;
 267
 268       if (PREDICT_FALSE ((rx_comp->index & VMXNET3_RXCI_EOP) &&
 269                          (rx_comp->len & VMXNET3_RXCL_ERROR)))
 270         {
 271           vlib_buffer_free_one (vm, bi0);
 272           vlib_error_count (vm, node->node_index,
 273                             VMXNET3_INPUT_ERROR_RX_PACKET_EOP, 1);
 274           if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 275             {
 276               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 277               hb = 0;
 278             }
 279           prev_b0 = 0;
 280           goto next;
 281         }
 282
 283       if (rx_comp->index & VMXNET3_RXCI_SOP)
 284         {
 285           ASSERT (!(rxd->flags & VMXNET3_RXF_BTYPE));
 286           /* start segment */
 287           if (vd->gso_enable &&
 288               (rx_comp->flags & VMXNET3_RXCF_CT) == VMXNET3_RXCOMP_TYPE_LRO)
 289             {
 290               vmxnet3_rx_comp_ext *lro = (vmxnet3_rx_comp_ext *) rx_comp;
 291
 292               gso_size = lro->flags & VMXNET3_RXECF_MSS_MASK;
 293             }
 294
 295           hb = b0;
 296           bi[0] = bi0;
 297           if (!(rx_comp->index & VMXNET3_RXCI_EOP))
 298             {
 299               hb->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
 300               prev_b0 = b0;
 301             }
 302           else
 303             {
 304               /*
 305                * Both start and end of packet is set. It is a complete packet
 306                */
 307               prev_b0 = 0;
 308               got_packet = 1;
 309             }
 310         }
 311       else if (rx_comp->index & VMXNET3_RXCI_EOP)
 312         {
 313           /* end of segment */
 314           if (PREDICT_TRUE (prev_b0 != 0))
 315             {
 316               if (PREDICT_TRUE (b0->current_length != 0))
 317                 {
 318                   prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 319                   prev_b0->next_buffer = bi0;
 320                   hb->total_length_not_including_first_buffer +=
 321                     b0->current_length;
 322                 }
 323               else
 324                 {
 325                   vlib_buffer_free_one (vm, bi0);
 326                 }
 327               prev_b0 = 0;
 328               got_packet = 1;
 329             }
 330           else
 331             {
 332               /* EOP without SOP, error */
 333               vlib_error_count (vm, node->node_index,
 334                                 VMXNET3_INPUT_ERROR_RX_PACKET_NO_SOP, 1);
 335               vlib_buffer_free_one (vm, bi0);
 336               if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 337                 {
 338                   vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 339                   hb = 0;
 340                 }
 341               goto next;
 342             }
 343         }
 344       else if (prev_b0)         // !sop && !eop
 345         {
 346           /* mid chain */
 347           ASSERT (rxd->flags & VMXNET3_RXF_BTYPE);
 348           prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 349           prev_b0->next_buffer = bi0;
 350           prev_b0 = b0;
 351           hb->total_length_not_including_first_buffer += b0->current_length;
 352         }
 353       else
 354         {
 355           vlib_error_count (vm, node->node_index,
 356                             VMXNET3_INPUT_ERROR_RX_PACKET, 1);
 357           vlib_buffer_free_one (vm, bi0);
 358           if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 359             {
 360               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 361               hb = 0;
 362             }
 363           goto next;
 364         }
 365
 366       n_rx_bytes += b0->current_length;
 367
 368       if (got_packet)
 369         {
 370           if (PREDICT_FALSE (vd->per_interface_next_index != ~0))
 371             {
 372               next_index = vd->per_interface_next_index;
 373               known_next = 1;
 374             }
 375
 376           if (PREDICT_FALSE
 377               (vnet_device_input_have_features (vd->sw_if_index)))
 378             {
 379               vnet_feature_start_device_input_x1 (vd->sw_if_index,
 380                                                   &next_index, hb);
 381               known_next = 1;
 382             }
 383
 384           if (PREDICT_FALSE (known_next))
 385             next[0] = next_index;
 386           else
 387             {
 388               ethernet_header_t *e = (ethernet_header_t *) hb->data;
 389
 390               next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 391               if (!ethernet_frame_is_tagged (ntohs (e->type)))
 392                 vmxnet3_handle_offload (rx_comp, hb, 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 = vlib_get_buffer (vm, bi[0]);
 417           if (PREDICT_TRUE
 418               (vlib_trace_buffer
 419                (vm, node, next[0], b, /* follow_chain */ 0)))
 420             {
 421               vmxnet3_input_trace_t *tr =
 422                 vlib_add_trace (vm, node, b, sizeof (*tr));
 423               tr->next_index = next[0];
 424               tr->hw_if_index = vd->hw_if_index;
 425               tr->buffer = *b;
 426               n_trace--;
 427             }
 428           n_left--;
 429           bi++;
 430           next++;
 431         }
 432       vlib_set_trace_count (vm, node, n_trace);
 433     }
 434
 435   if (PREDICT_TRUE (n_rx_packets))
 436     {
 437       vlib_buffer_enqueue_to_next (vm, node, buffer_indices, nexts,
 438                                    n_rx_packets);
 439       vlib_increment_combined_counter
 440         (vnm->interface_main.combined_sw_if_counters +
 441          VNET_INTERFACE_COUNTER_RX, thread_index,
 442          vd->sw_if_index, n_rx_packets, n_rx_bytes);
 443     }
 444
 445   error = vmxnet3_rxq_refill_ring0 (vm, vd, rxq);
 446   if (PREDICT_FALSE (error != 0))
 447     {
 448       vlib_error_count (vm, node->node_index,
 449                         VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 450     }
 451   error = vmxnet3_rxq_refill_ring1 (vm, vd, rxq);
 452   if (PREDICT_FALSE (error != 0))
 453     {
 454       vlib_error_count (vm, node->node_index,
 455                         VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 456     }
 457
 458   return n_rx_packets;
 459 }
 460
 461 VLIB_NODE_FN (vmxnet3_input_node) (vlib_main_t * vm,
 462                                    vlib_node_runtime_t * node,
 463                                    vlib_frame_t * frame)
 464 {
 465   u32 n_rx = 0;
 466   vmxnet3_main_t *vmxm = &vmxnet3_main;
 467   vnet_hw_if_rxq_poll_vector_t *pv = vnet_hw_if_get_rxq_poll_vector (vm, node);
 468   vnet_hw_if_rxq_poll_vector_t *pve;
 469
 470   vec_foreach (pve, pv)
 471     {
 472       vmxnet3_device_t *vd;
 473       vd = vec_elt_at_index (vmxm->devices, pve->dev_instance);
 474       if ((vd->flags & VMXNET3_DEVICE_F_ADMIN_UP) == 0)
 475         continue;
 476       n_rx += vmxnet3_device_input_inline (vm, node, frame, vd, pve->queue_id);
 477     }
 478   return n_rx;
 479 }
 480
 481 #ifndef CLIB_MARCH_VARIANT
 482 /* *INDENT-OFF* */
 483 VLIB_REGISTER_NODE (vmxnet3_input_node) = {
 484   .name = "vmxnet3-input",
 485   .sibling_of = "device-input",
 486   .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
 487   .format_trace = format_vmxnet3_input_trace,
 488   .type = VLIB_NODE_TYPE_INPUT,
 489   .state = VLIB_NODE_STATE_DISABLED,
 490   .n_errors = VMXNET3_INPUT_N_ERROR,
 491   .error_strings = vmxnet3_input_error_strings,
 492 };
 493 #endif
 494
 495 /* *INDENT-ON* */
 496
 497 /*
 498  * fd.io coding-style-patch-verification: ON
 499  *
 500  * Local Variables:
 501  * eval: (c-set-style "gnu")
 502  * End:
 503  */