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