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