summaryrefslogtreecommitdiffstats
path: root/src/vnet/session/application_interface.h
diff options
context:
space:
mode:
authorFlorin Coras <fcoras@cisco.com>2019-12-19 16:10:58 -0800
committerDave Barach <openvpp@barachs.net>2020-02-25 19:18:49 +0000
commitf22f4e562e1b922cff036ef628b77fd2d479d015 (patch)
tree4cbc3091a5ce89a73c94685dcee198dd583ca375 /src/vnet/session/application_interface.h
parentb020806806c0e6c54886cdb4347a5fd1f19504b0 (diff)
svm: refactor fifo
Type: refactor Switch from a wrapped byte space to a "continuous" one wherein fifo chunks are appended to the fifo as more data is enqueued and chunks are removed as data is dequeued. The fifo is still subject to a maximum size, i.e., maximum number of bytes that can be enqueued, so the max number of chunks associated to the fifo is also constrained. When enqueueing data, which must fit within the available free space, if not enough "supporting" chunk memory is available, the fifo asks the fifo segment for enough chunk memory to ensure that the write can succeed. To avoid allocating large amounts of small chunks due to small writes, if possible, the size of the chunks requested is lower capped by min_alloc. When dequeuing data, all the chunks that have been completely drained, i.e., head moved beyond the chunks’ end bytes, are unlinked from the fifo and returned to the fifo segment. The one exception to this is the last chunk which is never unlinked. Change-Id: I98c1dbd9135fb79650365c7e40c29238b96cd4ee Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/session/application_interface.h')
0 files changed, 0 insertions, 0 deletions
='n175' href='#n175'>175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 
/*
 *------------------------------------------------------------------
 * Copyright (c) 2018 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *------------------------------------------------------------------
 */

#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vlib/pci/pci.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/devices/devices.h>

#include <vmxnet3/vmxnet3.h>

#define foreach_vmxnet3_input_error \
  _(BUFFER_ALLOC, "buffer alloc error") \
  _(RX_PACKET_NO_SOP, "Rx packet error - no SOP") \
  _(RX_PACKET, "Rx packet error") \
  _(RX_PACKET_EOP, "Rx packet error found on EOP") \
  _(NO_BUFFER, "Rx no buffer error")

typedef enum
{
#define _(f,s) VMXNET3_INPUT_ERROR_##f,
  foreach_vmxnet3_input_error
#undef _
    VMXNET3_INPUT_N_ERROR,
} vmxnet3_input_error_t;

static __clib_unused char *vmxnet3_input_error_strings[] = {
#define _(n,s) s,
  foreach_vmxnet3_input_error
#undef _
};

static_always_inline u16
vmxnet3_find_rid (vmxnet3_device_t * vd, vmxnet3_rx_comp * rx_comp)
{
  u32 rid;

  // rid is bits 16-25 (10 bits number)
  rid = rx_comp->index & (0xffffffff >> 6);
  rid >>= 16;
  if ((rid >= vd->num_rx_queues) && (rid < (vd->num_rx_queues << 1)))
    return 1;
  else
    return 0;
}

static_always_inline void
vmxnet3_rx_comp_ring_advance_next (vmxnet3_rxq_t * rxq)
{
  vmxnet3_rx_comp_ring *comp_ring = &rxq->rx_comp_ring;

  comp_ring->next++;
  if (PREDICT_FALSE (comp_ring->next == rxq->size))
    {
      comp_ring->next = 0;
      comp_ring->gen ^= VMXNET3_RXCF_GEN;
    }
}

static_always_inline uword
vmxnet3_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
			     vlib_frame_t * frame, vmxnet3_device_t * vd,
			     u16 qid)
{
  vnet_main_t *vnm = vnet_get_main ();
  uword n_trace = vlib_get_trace_count (vm, node);
  u32 n_rx_packets = 0, n_rx_bytes = 0;
  vmxnet3_rx_comp *rx_comp;
  u32 desc_idx;
  vmxnet3_rxq_t *rxq;
  u32 thread_index = vm->thread_index;
  u32 buffer_indices[VLIB_FRAME_SIZE], *bi;
  u16 nexts[VLIB_FRAME_SIZE], *next;
  vmxnet3_rx_ring *ring;
  vmxnet3_rx_comp_ring *comp_ring;
  u16 rid;
  vlib_buffer_t *prev_b0 = 0, *hb = 0;
  u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
  u8 known_next = 0, got_packet = 0;
  vmxnet3_rx_desc *rxd;
  clib_error_t *error;

  rxq = vec_elt_at_index (vd->rxqs, qid);
  comp_ring = &rxq->rx_comp_ring;
  bi = buffer_indices;
  next = nexts;
  rx_comp = &rxq->rx_comp[comp_ring->next];

  while (PREDICT_TRUE ((n_rx_packets < VLIB_FRAME_SIZE) &&
		       (comp_ring->gen ==
			(rx_comp->flags & VMXNET3_RXCF_GEN))))
    {
      vlib_buffer_t *b0;
      u32 bi0;

      rid = vmxnet3_find_rid (vd, rx_comp);
      ring = &rxq->rx_ring[rid];

      if (PREDICT_TRUE (ring->fill >= 1))
	ring->fill--;
      else
	{
	  vlib_error_count (vm, node->node_index,
			    VMXNET3_INPUT_ERROR_NO_BUFFER, 1);
	  if (hb)
	    {
	      vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
	      hb = 0;
	    }
	  prev_b0 = 0;
	  break;
	}

      desc_idx = rx_comp->index & VMXNET3_RXC_INDEX;
      ring->consume = desc_idx;
      rxd = &rxq->rx_desc[rid][desc_idx];

      bi0 = ring->bufs[desc_idx];
      ring->bufs[desc_idx] = ~0;

      b0 = vlib_get_buffer (vm, bi0);
      vnet_buffer (b0)->sw_if_index[VLIB_RX] = vd->sw_if_index;
      vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
      vnet_buffer (b0)->feature_arc_index = 0;
      b0->current_length = rx_comp->len & VMXNET3_RXCL_LEN_MASK;
      b0->current_data = 0;
      b0->total_length_not_including_first_buffer = 0;
      b0->next_buffer = 0;
      b0->flags = 0;
      b0->error = 0;
      b0->current_config_index = 0;
      ASSERT (b0->current_length != 0);

      if (PREDICT_FALSE ((rx_comp->index & VMXNET3_RXCI_EOP) &&
			 (rx_comp->len & VMXNET3_RXCL_ERROR)))
	{
	  vlib_buffer_free_one (vm, bi0);
	  vlib_error_count (vm, node->node_index,
			    VMXNET3_INPUT_ERROR_RX_PACKET_EOP, 1);
	  if (hb && vlib_get_buffer_index (vm, hb) != bi0)
	    {
	      vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
	      hb = 0;
	    }
	  prev_b0 = 0;
	  goto next;
	}

      if (rx_comp->index & VMXNET3_RXCI_SOP)
	{
	  ASSERT (!(rxd->flags & VMXNET3_RXF_BTYPE));
	  /* start segment */
	  hb = b0;
	  bi[0] = bi0;
	  if (!(rx_comp->index & VMXNET3_RXCI_EOP))
	    {
	      hb->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
	      prev_b0 = b0;
	    }
	  else
	    {
	      /*
	       * Both start and end of packet is set. It is a complete packet
	       */
	      prev_b0 = 0;
	      got_packet = 1;
	    }
	}
      else if (rx_comp->index & VMXNET3_RXCI_EOP)
	{
	  /* end of segment */
	  if (prev_b0)
	    {
	      prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
	      prev_b0->next_buffer = bi0;
	      hb->total_length_not_including_first_buffer +=
		b0->current_length;
	      prev_b0 = 0;
	      got_packet = 1;
	    }
	  else
	    {
	      /* EOP without SOP, error */
	      vlib_error_count (vm, node->node_index,
				VMXNET3_INPUT_ERROR_RX_PACKET_NO_SOP, 1);
	      vlib_buffer_free_one (vm, bi0);
	      if (hb && vlib_get_buffer_index (vm, hb) != bi0)
		{
		  vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
		  hb = 0;
		}
	      goto next;
	    }
	}
      else if (prev_b0)		// !sop && !eop
	{
	  /* mid chain */
	  ASSERT (rxd->flags & VMXNET3_RXF_BTYPE);
	  prev_b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
	  prev_b0->next_buffer = bi0;
	  prev_b0 = b0;
	  hb->total_length_not_including_first_buffer += b0->current_length;
	}
      else
	{
	  vlib_error_count (vm, node->node_index,
			    VMXNET3_INPUT_ERROR_RX_PACKET, 1);
	  vlib_buffer_free_one (vm, bi0);
	  if (hb && vlib_get_buffer_index (vm, hb) != bi0)
	    {
	      vlib_buffer_free_one (vm, vlib_get_buffer_index (vm, hb));
	      hb = 0;
	    }
	  goto next;
	}

      n_rx_bytes += b0->current_length;

      if (got_packet)
	{
	  ethernet_header_t *e = (ethernet_header_t *) hb->data;

	  if (PREDICT_FALSE (vd->per_interface_next_index != ~0))
	    {
	      next_index = vd->per_interface_next_index;
	      known_next = 1;
	    }

	  if (PREDICT_FALSE
	      (vnet_device_input_have_features (vd->sw_if_index)))
	    {
	      vnet_feature_start_device_input_x1 (vd->sw_if_index,
						  &next_index, hb);
	      known_next = 1;
	    }

	  if (PREDICT_FALSE (known_next))
	    {
	      next[0] = next_index;
	    }
	  else
	    {
	      if (ethernet_frame_is_tagged (e->type))
		next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
	      else
		{
		  if (rx_comp->flags & VMXNET3_RXCF_IP4)
		    {
		      next[0] = VNET_DEVICE_INPUT_NEXT_IP4_NCS_INPUT;
		      hb->flags |= VNET_BUFFER_F_IS_IP4;
		      vlib_buffer_advance (hb,
					   device_input_next_node_advance
					   [next[0]]);
		    }
		  else if (rx_comp->flags & VMXNET3_RXCF_IP6)
		    {
		      next[0] = VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
		      hb->flags |= VNET_BUFFER_F_IS_IP6;
		      vlib_buffer_advance (hb,
					   device_input_next_node_advance
					   [next[0]]);
		    }
		  else
		    {
		      next[0] = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
		    }
		}
	    }

	  n_rx_packets++;
	  next++;
	  bi++;
	  hb = 0;
	  got_packet = 0;
	}

    next:
      vmxnet3_rx_comp_ring_advance_next (rxq);
      rx_comp = &rxq->rx_comp[comp_ring->next];
    }

  if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
    {
      u32 n_left = n_rx_packets;

      bi = buffer_indices;
      next = nexts;
      while (n_trace && n_left)
	{
	  vlib_buffer_t *b;
	  vmxnet3_input_trace_t *tr;

	  b = vlib_get_buffer (vm, bi[0]);
	  vlib_trace_buffer (vm, node, next[0], b, /* follow_chain */ 0);
	  tr = vlib_add_trace (vm, node, b, sizeof (*tr));
	  tr->next_index = next[0];
	  tr->hw_if_index = vd->hw_if_index;
	  tr->buffer = *b;

	  n_trace--;
	  n_left--;
	  bi++;
	  next++;
	}
      vlib_set_trace_count (vm, node, n_trace);
    }

  if (PREDICT_TRUE (n_rx_packets))
    {
      vlib_buffer_enqueue_to_next (vm, node, buffer_indices, nexts,
				   n_rx_packets);
      vlib_increment_combined_counter
	(vnm->interface_main.combined_sw_if_counters +
	 VNET_INTERFACE_COUNTER_RX, thread_index,
	 vd->hw_if_index, n_rx_packets, n_rx_bytes);
    }

  error = vmxnet3_rxq_refill_ring0 (vm, vd, rxq);
  if (PREDICT_FALSE (error != 0))
    {
      vlib_error_count (vm, node->node_index,
			VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
    }
  error = vmxnet3_rxq_refill_ring1 (vm, vd, rxq);
  if (PREDICT_FALSE (error != 0))
    {
      vlib_error_count (vm, node->node_index,
			VMXNET3_INPUT_ERROR_BUFFER_ALLOC, 1);
    }

  return n_rx_packets;
}

VLIB_NODE_FN (vmxnet3_input_node) (vlib_main_t * vm,
				   vlib_node_runtime_t * node,
				   vlib_frame_t * frame)
{
  u32 n_rx = 0;
  vmxnet3_main_t *vmxm = &vmxnet3_main;
  vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
  vnet_device_and_queue_t *dq;

  foreach_device_and_queue (dq, rt->devices_and_queues)
  {
    vmxnet3_device_t *vd;
    vd = vec_elt_at_index (vmxm->devices, dq->dev_instance);
    if ((vd->flags & VMXNET3_DEVICE_F_ADMIN_UP) == 0)
      continue;
    n_rx += vmxnet3_device_input_inline (vm, node, frame, vd, dq->queue_id);
  }
  return n_rx;
}

#ifndef CLIB_MARCH_VARIANT
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (vmxnet3_input_node) = {
  .name = "vmxnet3-input",
  .sibling_of = "device-input",
  .format_trace = format_vmxnet3_input_trace,
  .type = VLIB_NODE_TYPE_INPUT,
  .state = VLIB_NODE_STATE_DISABLED,
  .n_errors = VMXNET3_INPUT_N_ERROR,
  .error_strings = vmxnet3_input_error_strings,
};
#endif

/* *INDENT-ON* */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */