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
  92   rxq = vec_elt_at_index (vd->rxqs, qid);
  93   comp_ring = &rxq->rx_comp_ring;
  94   bi = buffer_indices;
  95   next = nexts;
  96   while (comp_ring->gen ==
  97          (rxq->rx_comp[comp_ring->next].flags & VMXNET3_RXCF_GEN))
  98     {
  99       vlib_buffer_t *b0;
 100
 101       comp_idx = comp_ring->next;
 102       rx_comp = &rxq->rx_comp[comp_idx];
 103
 104       rid = vmxnet3_find_rid (vd, rx_comp);
 105       ring = &rxq->rx_ring[rid];
 106
 107       if (PREDICT_TRUE (ring->fill >= 1))
 108         ring->fill--;
 109       else
 110         {
 111           vlib_error_count (vm, node->node_index,
 112                             VMXNET3_INPUT_ERROR_NO_BUFFER, 1);
 113           break;
 114         }
 115
 116       vmxnet3_rx_comp_ring_advance_next (rxq);
 117       desc_idx = rx_comp->index & VMXNET3_RXC_INDEX;
 118       ring->consume = desc_idx;
 119
 120       bi[0] = ring->bufs[desc_idx];
 121       ring->bufs[desc_idx] = ~0;
 122
 123       b0 = vlib_get_buffer (vm, bi[0]);
 124       vnet_buffer (b0)->sw_if_index[VLIB_RX] = vd->sw_if_index;
 125       vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 126       b0->current_length = rx_comp->len & VMXNET3_RXCL_LEN_MASK;
 127       b0->current_data = 0;
 128       b0->total_length_not_including_first_buffer = 0;
 129       b0->next_buffer = 0;
 130       b0->flags = 0;
 131       b0->error = 0;
 132       ASSERT (b0->current_length != 0);
 133
 134       if (rx_comp->index & VMXNET3_RXCI_SOP)
 135         {
 136           /* start segment */
 137           hb = b0;
 138           if (!(rx_comp->index & VMXNET3_RXCI_EOP))
 139             {
 140               hb->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
 141               b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 142               prev_b0 = b0;
 143             }
 144           else
 145             {
 146               /*
 147                * Both start and end of packet is set. It is a complete packet
 148                */
 149               prev_b0 = 0;
 150             }
 151
 152         }
 153       else if (rx_comp->index & VMXNET3_RXCI_EOP)
 154         {
 155           /* end of segment */
 156           if (prev_b0)
 157             {
 158               prev_b0->next_buffer = bi[0];
 159               prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 160               hb->total_length_not_including_first_buffer +=
 161                 b0->current_length;
 162               prev_b0 = 0;      // Get next packet
 163             }
 164           else
 165             {
 166               /* EOP without SOP, error */
 167               hb = 0;
 168               bi++;
 169               vlib_error_count (vm, node->node_index,
 170                                 VMXNET3_INPUT_ERROR_RX_PACKET, 1);
 171               vlib_buffer_free_one (vm, bi[0]);
 172               continue;
 173             }
 174         }
 175       else if (prev_b0)         // !sop && !eop
 176         {
 177           /* mid chain */
 178           b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
 179           prev_b0->next_buffer = bi[0];
 180           prev_b0 = b0;
 181           hb->total_length_not_including_first_buffer += b0->current_length;
 182         }
 183       else
 184         {
 185           ASSERT (0);
 186         }
 187
 188       bi++;
 189       n_rx_bytes += b0->current_length;
 190
 191       if (!prev_b0)
 192         {
 193           next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
 194           n_rx_packets++;
 195           next++;
 196           hb = 0;
 197         }
 198     }
 199
 200   if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
 201     {
 202       u32 n_left = n_rx_packets;
 203
 204       bi = buffer_indices;
 205       next = nexts;
 206       while (n_trace && n_left)
 207         {
 208           vlib_buffer_t *b;
 209           vmxnet3_input_trace_t *tr;
 210
 211           b = vlib_get_buffer (vm, bi[0]);
 212           vlib_trace_buffer (vm, node, next[0], b, /* follow_chain */ 0);
 213           tr = vlib_add_trace (vm, node, b, sizeof (*tr));
 214           tr->next_index = next[0];
 215           tr->hw_if_index = vd->hw_if_index;
 216           tr->buffer = *b;
 217
 218           n_trace--;
 219           n_left--;
 220           bi++;
 221           next++;
 222         }
 223       vlib_set_trace_count (vm, node, n_trace);
 224     }
 225
 226   if (PREDICT_TRUE (n_rx_packets))
 227     {
 228       clib_error_t *error;
 229
 230       vlib_buffer_enqueue_to_next (vm, node, buffer_indices, nexts,
 231                                    n_rx_packets);
 232       vlib_increment_combined_counter
 233         (vnm->interface_main.combined_sw_if_counters +
 234          VNET_INTERFACE_COUNTER_RX, thread_index,
 235          vd->hw_if_index, n_rx_packets, n_rx_bytes);
 236
 237       error = vmxnet3_rxq_refill_ring0 (vm, vd, rxq);
 238       if (PREDICT_FALSE (error != 0))
 239         {
 240           vlib_error_count (vm, node->node_index,
 241                             VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 242         }
 243       error = vmxnet3_rxq_refill_ring1 (vm, vd, rxq);
 244       if (PREDICT_FALSE (error != 0))
 245         {
 246           vlib_error_count (vm, node->node_index,
 247                             VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
 248         }
 249     }
 250
 251   return n_rx_packets;
 252 }
 253
 254 VLIB_NODE_FN (vmxnet3_input_node) (vlib_main_t * vm,
 255                                    vlib_node_runtime_t * node,
 256                                    vlib_frame_t * frame)
 257 {
 258   u32 n_rx = 0;
 259   vmxnet3_main_t *vmxm = &vmxnet3_main;
 260   vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
 261   vnet_device_and_queue_t *dq;
 262
 263   foreach_device_and_queue (dq, rt->devices_and_queues)
 264   {
 265     vmxnet3_device_t *vd;
 266     vd = vec_elt_at_index (vmxm->devices, dq->dev_instance);
 267     if ((vd->flags & VMXNET3_DEVICE_F_ADMIN_UP) == 0)
 268       continue;
 269     n_rx += vmxnet3_device_input_inline (vm, node, frame, vd, dq->queue_id);
 270   }
 271   return n_rx;
 272 }
 273
 274 #ifndef CLIB_MARCH_VARIANT
 275 /* *INDENT-OFF* */
 276 VLIB_REGISTER_NODE (vmxnet3_input_node) = {
 277   .name = "vmxnet3-input",
 278   .sibling_of = "device-input",
 279   .format_trace = format_vmxnet3_input_trace,
 280   .type = VLIB_NODE_TYPE_INPUT,
 281   .state = VLIB_NODE_STATE_DISABLED,
 282   .n_errors = VMXNET3_INPUT_N_ERROR,
 283   .error_strings = vmxnet3_input_error_strings,
 284 };
 285 #endif
 286
 287 /* *INDENT-ON* */
 288
 289 /*
 290  * fd.io coding-style-patch-verification: ON
 291  *
 292  * Local Variables:
 293  * eval: (c-set-style "gnu")
 294  * End:
 295  */