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