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
  24 #include <vmxnet3/vmxnet3.h>
  25
  26 #define foreach_vmxnet3_input_error \
  27   _(BUFFER_ALLOC, "buffer alloc error") \
  28   _(RX_PACKET_NO_SOP, "Rx packet error - no SOP") \
  29   _(RX_PACKET, "Rx packet error") \
  30   _(RX_PACKET_EOP, "Rx packet error found on EOP") \
  31   _(NO_BUFFER, "Rx no buffer error")
  32
  33 typedef enum
  34 {
  35 #define _(f,s) VMXNET3_INPUT_ERROR_##f,
  36   foreach_vmxnet3_input_error
  37 #undef _
  38     VMXNET3_INPUT_N_ERROR,
  39 } vmxnet3_input_error_t;
  40
  41 static __clib_unused char *vmxnet3_input_error_strings[] = {
  42 #define _(n,s) s,
  43   foreach_vmxnet3_input_error
  44 #undef _
  45 };
  46
  47 static_always_inline u16
  48 vmxnet3_find_rid (vmxnet3_device_t * vd, vmxnet3_rx_comp * rx_comp)
  49 {
  50   u32 rid;
  51
  52   // rid is bits 16-25 (10 bits number)
  53   rid = rx_comp->index & (0xffffffff >> 6);
  54   rid >>= 16;
  55   if ((rid >= vd->num_rx_queues) && (rid < (vd->num_rx_queues << 1)))
  56     return 1;
  57   else
  58     return 0;
  59 }
  60
  61 static_always_inline void
  62 vmxnet3_rx_comp_ring_advance_next (vmxnet3_rxq_t * rxq)
  63 {
  64   vmxnet3_rx_comp_ring *comp_ring = &rxq->rx_comp_ring;
  65
  66   comp_ring->next++;
  67   if (PREDICT_FALSE (comp_ring->next == rxq->size))
  68     {
  69       comp_ring->next = 0;
  70       comp_ring->gen ^= VMXNET3_RXCF_GEN;
  71     }
  72 }
  73
  74 static_always_inline uword
  75 vmxnet3_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
  76                              vlib_frame_t * frame, vmxnet3_device_t * vd,
  77                              u16 qid)
  78 {
  79   vnet_main_t *vnm = vnet_get_main ();
  80   uword n_trace = vlib_get_trace_count (vm, node);
  81   u32 n_rx_packets = 0, n_rx_bytes = 0;
  82   vmxnet3_rx_comp *rx_comp;
  83   u32 desc_idx;
  84   vmxnet3_rxq_t *rxq;
  85   u32 thread_index = vm->thread_index;
  86   u32 buffer_indices[VLIB_FRAME_SIZE], *bi;
  87   u16 nexts[VLIB_FRAME_SIZE], *next;
  88   vmxnet3_rx_ring *ring;
  89   vmxnet3_rx_comp_ring *comp_ring;
  90   u16 rid;
  91   vlib_buffer_t *prev_b0 = 0, *hb = 0;
  92   u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
  93   u8 known_next = 0, got_packet = 0;
  94   vmxnet3_rx_desc *rxd;
  95   clib_error_t *error;
  96
  97   rxq = vec_elt_at_index (vd->rxqs, qid);
  98   comp_ring = &rxq->rx_comp_ring;
  99   bi = buffer_indices;
 100   next = nexts;
 101   rx_comp = &rxq->rx_comp[comp_ring->next];
 102
 103   while (PREDICT_TRUE (n_rx_packets < VLIB_FRAME_SIZE) &&
 104          (comp_ring->gen == (rx_comp->flags & VMXNET3_RXCF_GEN)))
 105     {
 106       vlib_buffer_t *b0;
 107       u32 bi0;
 108
 109       rid = vmxnet3_find_rid (vd, rx_comp);
 110       ring = &rxq->rx_ring[rid];
 111
 112       if (PREDICT_TRUE (ring->fill >= 1))
 113         ring->fill--;
 114       else
 115         {
 116           vlib_error_count (vm, node->node_index,
 117                             VMXNET3_INPUT_ERROR_NO_BUFFER, 1);
 118           if (hb)
 119             {
 120               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 121               hb = 0;
 122             }
 123           prev_b0 = 0;
 124           break;
 125         }
 126
 127       desc_idx = rx_comp->index & VMXNET3_RXC_INDEX;
 128       ring->consume = desc_idx;
 129       rxd = &rxq->rx_desc[rid][desc_idx];
 130
 131       bi0 = ring->bufs[desc_idx];
 132       ring->bufs[desc_idx] = ~0;
 133
 134       b0 = vlib_get_buffer (vm, bi0);
 135       vnet_buffer (b0)->sw_if_index[VLIB_RX] = vd->sw_if_index;
 136       vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 137       vnet_buffer (b0)->feature_arc_index = 0;
 138       b0->current_length = rx_comp->len & VMXNET3_RXCL_LEN_MASK;
 139       b0->current_data = 0;
 140       b0->total_length_not_including_first_buffer = 0;
 141       b0->next_buffer = 0;
 142       b0->flags = 0;
 143       b0->error = 0;
 144       b0->current_config_index = 0;
 145       ASSERT (b0->current_length != 0);
 146
 147       if (PREDICT_FALSE ((rx_comp->index & VMXNET3_RXCI_EOP) &&
 148                          (rx_comp->len & VMXNET3_RXCL_ERROR)))
 149         {
 150           vlib_buffer_free_one (vm, bi0);
 151           vlib_error_count (vm, node->node_index,
 152                             VMXNET3_INPUT_ERROR_RX_PACKET_EOP, 1);
 153           if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 154             {
 155               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 156               hb = 0;
 157             }
 158           prev_b0 = 0;
 159           goto next;
 160         }
 161
 162       if (rx_comp->index & VMXNET3_RXCI_SOP)
 163         {
 164           ASSERT (!(rxd->flags & VMXNET3_RXF_BTYPE));
 165           /* start segment */
 166           hb = b0;
 167           bi[0] = bi0;
 168           if (!(rx_comp->index & VMXNET3_RXCI_EOP))
 169             {
 170               hb->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
 171               prev_b0 = b0;
 172             }
 173           else
 174             {
 175               /*
 176                * Both start and end of packet is set. It is a complete packet
 177                */
 178               prev_b0 = 0;
 179               got_packet = 1;
 180             }
 181         }
 182       else if (rx_comp->index & VMXNET3_RXCI_EOP)
 183         {
 184           /* end of segment */
 185           if (prev_b0)
 186             {
 187               prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 188               prev_b0->next_buffer = bi0;
 189               hb->total_length_not_including_first_buffer +=
 190                 b0->current_length;
 191               prev_b0 = 0;
 192               got_packet = 1;
 193             }
 194           else
 195             {
 196               /* EOP without SOP, error */
 197               vlib_error_count (vm, node->node_index,
 198                                 VMXNET3_INPUT_ERROR_RX_PACKET_NO_SOP, 1);
 199               vlib_buffer_free_one (vm, bi0);
 200               if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 201                 {
 202                   vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 203                   hb = 0;
 204                 }
 205               goto next;
 206             }
 207         }
 208       else if (prev_b0)         // !sop && !eop
 209         {
 210           /* mid chain */
 211           ASSERT (rxd->flags & VMXNET3_RXF_BTYPE);
 212           prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 213           prev_b0->next_buffer = bi0;
 214           prev_b0 = b0;
 215           hb->total_length_not_including_first_buffer += b0->current_length;
 216         }
 217       else
 218         {
 219           vlib_error_count (vm, node->node_index,
 220                             VMXNET3_INPUT_ERROR_RX_PACKET, 1);
 221           vlib_buffer_free_one (vm, bi0);
 222           if (hb && vlib_get_buffer_index (vm, hb) != bi0)
 223             {
 224               vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
 225               hb = 0;
 226             }
 227           goto next;
 228         }
 229
 230       n_rx_bytes += b0->current_length;
 231
 232       if (got_packet)
 233         {
 234           ethernet_header_t *e = (ethernet_header_t *) hb->data;
 235
 236           if (PREDICT_FALSE (vd->per_interface_next_index != ~0))
 237             {
 238               next_index = vd->per_interface_next_index;
 239               known_next = 1;
 240             }
 241
 242           if (PREDICT_FALSE
 243               (vnet_device_input_have_features (vd->sw_if_index)))
 244             {
 245               vnet_feature_start_device_input_x1 (vd->sw_if_index,
 246                                                   &next_index, hb);
 247               known_next = 1;
 248             }
 249
 250           if (PREDICT_FALSE (known_next))
 251             {
 252               next[0] = next_index;
 253             }
 254           else
 255             {
 256               if (ethernet_frame_is_tagged (e->type))
 257                 next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 258               else
 259                 {
 260                   if (rx_comp->flags & VMXNET3_RXCF_IP4)
 261                     {
 262                       next[0] = VNET_DEVICE_INPUT_NEXT_IP4_NCS_INPUT;
 263                       hb->flags |= VNET_BUFFER_F_IS_IP4;
 264                       vlib_buffer_advance (hb,
 265                                            device_input_next_node_advance
 266                                            [next[0]]);
 267                     }
 268                   else if (rx_comp->flags & VMXNET3_RXCF_IP6)
 269                     {
 270                       next[0] = VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
 271                       hb->flags |= VNET_BUFFER_F_IS_IP6;
 272                       vlib_buffer_advance (hb,
 273                                            device_input_next_node_advance
 274                                            [next[0]]);
 275                     }
 276                   else
 277                     {
 278                       next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 279                     }
 280                 }
 281             }
 282
 283           n_rx_packets++;
 284           next++;
 285           bi++;
 286           hb = 0;
 287           got_packet = 0;
 288         }
 289
 290     next:
 291       vmxnet3_rx_comp_ring_advance_next (rxq);
 292       rx_comp = &rxq->rx_comp[comp_ring->next];
 293     }
 294
 295   if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
 296     {
 297       u32 n_left = n_rx_packets;
 298
 299       bi = buffer_indices;
 300       next = nexts;
 301       while (n_trace && n_left)
 302         {
 303           vlib_buffer_t *b;
 304           vmxnet3_input_trace_t *tr;
 305
 306           b = vlib_get_buffer (vm, bi[0]);
 307           vlib_trace_buffer (vm, node, next[0], b, /* follow_chain */ 0);
 308           tr = vlib_add_trace (vm, node, b, sizeof (*tr));
 309           tr->next_index = next[0];
 310           tr->hw_if_index = vd->hw_if_index;
 311           tr->buffer = *b;
 312
 313           n_trace--;
 314           n_left--;
 315           bi++;
 316           next++;
 317         }
 318       vlib_set_trace_count (vm, node, n_trace);
 319     }
 320
 321   if (PREDICT_TRUE (n_rx_packets))
 322     {
 323       vlib_buffer_enqueue_to_next (vm, node, buffer_indices, nexts,
 324                                    n_rx_packets);
 325       vlib_increment_combined_counter
 326         (vnm->interface_main.combined_sw_if_counters +
 327          VNET_INTERFACE_COUNTER_RX, thread_index,
 328          vd->hw_if_index, n_rx_packets, n_rx_bytes);
 329     }
 330
 331   error = vmxnet3_rxq_refill_ring0 (vm, vd, rxq);
 332   if (PREDICT_FALSE (error != 0))
 333     {
 334       vlib_error_count (vm, node->node_index,
 335                         VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 336     }
 337   error = vmxnet3_rxq_refill_ring1 (vm, vd, rxq);
 338   if (PREDICT_FALSE (error != 0))
 339     {
 340       vlib_error_count (vm, node->node_index,
 341                         VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 342     }
 343
 344   return n_rx_packets;
 345 }
 346
 347 VLIB_NODE_FN (vmxnet3_input_node) (vlib_main_t * vm,
 348                                    vlib_node_runtime_t * node,
 349                                    vlib_frame_t * frame)
 350 {
 351   u32 n_rx = 0;
 352   vmxnet3_main_t *vmxm = &vmxnet3_main;
 353   vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
 354   vnet_device_and_queue_t *dq;
 355
 356   foreach_device_and_queue (dq, rt->devices_and_queues)
 357   {
 358     vmxnet3_device_t *vd;
 359     vd = vec_elt_at_index (vmxm->devices, dq->dev_instance);
 360     if ((vd->flags & VMXNET3_DEVICE_F_ADMIN_UP) == 0)
 361       continue;
 362     n_rx += vmxnet3_device_input_inline (vm, node, frame, vd, dq->queue_id);
 363   }
 364   return n_rx;
 365 }
 366
 367 #ifndef CLIB_MARCH_VARIANT
 368 /* *INDENT-OFF* */
 369 VLIB_REGISTER_NODE (vmxnet3_input_node) = {
 370   .name = "vmxnet3-input",
 371   .sibling_of = "device-input",
 372   .format_trace = format_vmxnet3_input_trace,
 373   .type = VLIB_NODE_TYPE_INPUT,
 374   .state = VLIB_NODE_STATE_DISABLED,
 375   .n_errors = VMXNET3_INPUT_N_ERROR,
 376   .error_strings = vmxnet3_input_error_strings,
 377 };
 378 #endif
 379
 380 /* *INDENT-ON* */
 381
 382 /*
 383  * fd.io coding-style-patch-verification: ON
 384  *
 385  * Local Variables:
 386  * eval: (c-set-style "gnu")
 387  * End:
 388  */