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authorDamjan Marion <damarion@cisco.com>2017-07-05 18:13:10 +0200
committerNeale Ranns <nranns@cisco.com>2017-07-10 16:24:16 +0000
commite2b3493029659bb0fd7eb9c571a757a060726774 (patch)
tree58345d4f624886b15d036b357a2ed1bb6f4060da /src
parent191a1a407ebd299907d2890cbb0369a6d7c19a45 (diff)
memif: mask interrupts on startup if we are in the polling mode
Change-Id: Ief02eb1109a1bc463665d9747e9fa4e0c0e3d7e0 Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src')
-rw-r--r--src/plugins/memif/memif.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/plugins/memif/memif.c b/src/plugins/memif/memif.c
index fffb94c952b..ba1231495c8 100644
--- a/src/plugins/memif/memif.c
+++ b/src/plugins/memif/memif.c
@@ -227,6 +227,14 @@ memif_connect (memif_if_t * mif)
clib_warning
("Warning: unable to set rx mode for interface %d queue %d: "
"rc=%d", mif->hw_if_index, i, rv);
+ else
+ {
+ vnet_hw_interface_rx_mode rxmode;
+ vnet_hw_interface_get_rx_mode (vnm, mif->hw_if_index, i, &rxmode);
+
+ if (rxmode == VNET_HW_INTERFACE_RX_MODE_POLLING)
+ mq->ring->flags |= MEMIF_RING_FLAG_MASK_INT;
+ }
}
mif->flags &= ~MEMIF_IF_FLAG_CONNECTING;
2'>172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 
/*
 *------------------------------------------------------------------
 * 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 <avf/avf.h>

#define foreach_avf_input_error \
  _(BUFFER_ALLOC, "buffer alloc error") \
  _(RX_PACKET_ERROR, "Rx packet errors")

typedef enum
{
#define _(f,s) AVF_INPUT_ERROR_##f,
  foreach_avf_input_error
#undef _
    AVF_INPUT_N_ERROR,
} avf_input_error_t;

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

#define AVF_RX_DESC_STATUS(x)		(1 << x)
#define AVF_RX_DESC_STATUS_DD		AVF_RX_DESC_STATUS(0)
#define AVF_RX_DESC_STATUS_EOP		AVF_RX_DESC_STATUS(1)

static_always_inline void
avf_input_trace (vlib_main_t * vm, vlib_node_runtime_t * node, u32 next0,
		 vlib_buffer_t * b0, uword * n_trace, avf_device_t * ad,
		 avf_rx_vector_entry_t * rxve)
{
  avf_input_trace_t *tr;
  vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */ 0);
  vlib_set_trace_count (vm, node, --(*n_trace));
  tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
  tr->next_index = next0;
  tr->hw_if_index = ad->hw_if_index;
  clib_memcpy (&tr->rxve, rxve, sizeof (avf_rx_vector_entry_t));
}

#define AVF_INPUT_REFILL_TRESHOLD 32
static_always_inline void
avf_rxq_refill (vlib_main_t * vm, vlib_node_runtime_t * node, avf_rxq_t * rxq,
		int use_iova)
{
  u16 n_refill, mask, n_alloc, slot;
  avf_rx_desc_t *d;

  n_refill = rxq->size - 1 - rxq->n_bufs;
  if (PREDICT_TRUE (n_refill <= AVF_INPUT_REFILL_TRESHOLD))
    return;

  mask = rxq->size - 1;
  slot = (rxq->next - n_refill - 1) & mask;

  n_refill &= ~7;		/* round to 8 */
  n_alloc = vlib_buffer_alloc_to_ring (vm, rxq->bufs, slot, rxq->size,
				       n_refill);

  if (PREDICT_FALSE (n_alloc != n_refill))
    {
      vlib_error_count (vm, node->node_index,
			AVF_INPUT_ERROR_BUFFER_ALLOC, 1);
      if (n_alloc)
	vlib_buffer_free (vm, rxq->bufs + slot, n_alloc);
      return;
    }

  rxq->n_bufs += n_alloc;

  while (n_alloc--)
    {
      u64 addr;
      d = ((avf_rx_desc_t *) rxq->descs) + slot;
      if (use_iova)
	{
	  vlib_buffer_t *b = vlib_get_buffer (vm, rxq->bufs[slot]);
	  addr = pointer_to_uword (b->data);
	}
      else
	addr = vlib_get_buffer_data_physical_address (vm, rxq->bufs[slot]);
      d->qword[0] = addr;
      d->qword[1] = 0;
      slot = (slot + 1) & mask;
    }

  CLIB_MEMORY_BARRIER ();
  *(rxq->qrx_tail) = slot;
}

static_always_inline void
avf_check_for_error (vlib_node_runtime_t * node, avf_rx_vector_entry_t * rxve,
		     vlib_buffer_t * b, u32 * next)
{
  avf_main_t *am = &avf_main;
  avf_ptype_t *ptype;
  if (PREDICT_FALSE (rxve->error))
    {
      b->error = node->errors[AVF_INPUT_ERROR_RX_PACKET_ERROR];
      ptype = am->ptypes + rxve->ptype;
      /* retract */
      vlib_buffer_advance (b, --ptype->buffer_advance);
      *next = VNET_DEVICE_INPUT_NEXT_DROP;
    }
}

static_always_inline u32
avf_find_next (avf_rx_vector_entry_t * rxve, vlib_buffer_t * b,
	       int maybe_tagged)
{
  avf_main_t *am = &avf_main;
  ethernet_header_t *e = (ethernet_header_t *) b->data;
  avf_ptype_t *ptype;
  if (maybe_tagged && ethernet_frame_is_tagged (e->type))
    return VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
  ptype = am->ptypes + rxve->ptype;
  vlib_buffer_advance (b, ptype->buffer_advance);
  b->flags |= ptype->flags;
  return ptype->next_node;
}


static_always_inline uword
avf_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
			 vlib_frame_t * frame, avf_device_t * ad, u16 qid,
			 int with_features_or_tracing)
{
  avf_main_t *am = &avf_main;
  vnet_main_t *vnm = vnet_get_main ();
  u32 thr_idx = vlib_get_thread_index ();
  avf_per_thread_data_t *ptd =
    vec_elt_at_index (am->per_thread_data, thr_idx);
  avf_rxq_t *rxq = vec_elt_at_index (ad->rxqs, qid);
  avf_rx_vector_entry_t *rxve;
  uword n_trace = vlib_get_trace_count (vm, node);
  u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
  avf_rx_desc_t *d;
  u32 *to_next = 0;
  u32 n_rx_packets = 0;
  u32 n_rx_bytes = 0;
  u32 sw_if_idx[VLIB_N_RX_TX] = {[VLIB_RX] = ad->sw_if_index,[VLIB_TX] = ~0 };
  u16 mask = rxq->size - 1;
  u16 n_rxv = 0;
  u8 maybe_error = 0;

  /* fetch up to AVF_RX_VECTOR_SZ from the rx ring, unflatten them and
     copy needed data from descriptor to rx vector */
  d = rxq->descs + rxq->next;
  while ((d->qword[1] & AVF_RX_DESC_STATUS_DD) && n_rxv < AVF_RX_VECTOR_SZ)
    {
      u16 next_pf = (rxq->next + 8) & mask;
      CLIB_PREFETCH (rxq->descs + next_pf, CLIB_CACHE_LINE_BYTES, LOAD);
      rxve = ptd->rx_vector + n_rxv;
      rxve->bi = rxq->bufs[rxq->next];
      rxve->status = avf_get_u64_bits (d, 8, 18, 0);
      rxve->error = avf_get_u64_bits (d, 8, 26, 19);
      rxve->ptype = avf_get_u64_bits (d, 8, 37, 30);
      rxve->length = avf_get_u64_bits (d, 8, 63, 38);
      maybe_error |= rxve->error;

      /* deal with chained buffers */
      while (PREDICT_FALSE ((d->qword[1] & AVF_RX_DESC_STATUS_EOP) == 0))
	{
	  clib_error ("fixme");
	}

      /* next */
      rxq->next = (rxq->next + 1) & mask;
      d = rxq->descs + rxq->next;
      n_rxv++;
      rxq->n_bufs--;
    }

  if (n_rxv == 0)
    return 0;

  /* refill rx ring */
  if (ad->flags & AVF_DEVICE_F_IOVA)
    avf_rxq_refill (vm, node, rxq, 1 /* use_iova */ );
  else
    avf_rxq_refill (vm, node, rxq, 0 /* use_iova */ );

  n_rx_packets = n_rxv;
  rxve = ptd->rx_vector;
  while (n_rxv)
    {
      u32 n_left_to_next;
      u32 bi0, bi1, bi2, bi3;
      vlib_buffer_t *b0, *b1, *b2, *b3;
      u32 next0, next1, next2, next3;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_rxv >= 12 && n_left_to_next >= 4)
	{
	  vlib_buffer_t *p;
	  p = vlib_get_buffer (vm, rxve[8].bi);
	  vlib_prefetch_buffer_header (p, LOAD);
	  CLIB_PREFETCH (p->data, CLIB_CACHE_LINE_BYTES, LOAD);

	  p = vlib_get_buffer (vm, rxve[9].bi);
	  vlib_prefetch_buffer_header (p, LOAD);
	  CLIB_PREFETCH (p->data, CLIB_CACHE_LINE_BYTES, LOAD);

	  p = vlib_get_buffer (vm, rxve[10].bi);
	  vlib_prefetch_buffer_header (p, LOAD);
	  CLIB_PREFETCH (p->data, CLIB_CACHE_LINE_BYTES, LOAD);

	  p = vlib_get_buffer (vm, rxve[11].bi);
	  vlib_prefetch_buffer_header (p, LOAD);
	  CLIB_PREFETCH (p->data, CLIB_CACHE_LINE_BYTES, LOAD);

	  to_next[0] = bi0 = rxve[0].bi;
	  to_next[1] = bi1 = rxve[1].bi;
	  to_next[2] = bi2 = rxve[2].bi;
	  to_next[3] = bi3 = rxve[3].bi;

	  b0 = vlib_get_buffer (vm, bi0);
	  b1 = vlib_get_buffer (vm, bi1);
	  b2 = vlib_get_buffer (vm, bi2);
	  b3 = vlib_get_buffer (vm, bi3);

	  b0->current_length = rxve[0].length;
	  b1->current_length = rxve[1].length;
	  b2->current_length = rxve[2].length;
	  b3->current_length = rxve[3].length;

	  n_rx_bytes += b0->current_length;
	  n_rx_bytes += b1->current_length;
	  n_rx_bytes += b2->current_length;
	  n_rx_bytes += b3->current_length;

	  if (PREDICT_TRUE (ad->per_interface_next_index == ~0))
	    {
	      ethernet_header_t *e0, *e1, *e2, *e3;

	      e0 = (ethernet_header_t *) b0->data;
	      e1 = (ethernet_header_t *) b1->data;
	      e2 = (ethernet_header_t *) b2->data;
	      e3 = (ethernet_header_t *) b3->data;

	      if (ethernet_frame_is_any_tagged_x4 (e0->type, e1->type,
						   e2->type, e3->type))
		{
		  next0 = avf_find_next (rxve, b0, 1);
		  next1 = avf_find_next (rxve + 1, b1, 1);
		  next2 = avf_find_next (rxve + 2, b2, 1);
		  next3 = avf_find_next (rxve + 3, b3, 1);
		}
	      else
		{
		  next0 = avf_find_next (rxve, b0, 0);
		  next1 = avf_find_next (rxve + 1, b1, 0);
		  next2 = avf_find_next (rxve + 2, b2, 0);
		  next3 = avf_find_next (rxve + 3, b3, 0);
		}

	      if (with_features_or_tracing)
		vnet_feature_start_device_input_x4 (ad->sw_if_index, &next0,
						    &next1, &next2, &next3,
						    b0, b1, b2, b3);

	      if (PREDICT_FALSE (maybe_error))
		{
		  avf_check_for_error (node, rxve + 0, b0, &next0);
		  avf_check_for_error (node, rxve + 1, b1, &next1);
		  avf_check_for_error (node, rxve + 2, b2, &next2);
		  avf_check_for_error (node, rxve + 3, b3, &next3);
		}
	    }
	  else
	    next0 = next1 = next2 = next3 = ad->per_interface_next_index;

	  clib_memcpy (vnet_buffer (b0)->sw_if_index, sw_if_idx,
		       sizeof (sw_if_idx));
	  clib_memcpy (vnet_buffer (b1)->sw_if_index, sw_if_idx,
		       sizeof (sw_if_idx));
	  clib_memcpy (vnet_buffer (b2)->sw_if_index, sw_if_idx,
		       sizeof (sw_if_idx));
	  clib_memcpy (vnet_buffer (b3)->sw_if_index, sw_if_idx,
		       sizeof (sw_if_idx));

	  VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
	  VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
	  VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b2);
	  VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b3);

	  if (with_features_or_tracing && PREDICT_FALSE (n_trace))
	    {
	      avf_input_trace (vm, node, next0, b0, &n_trace, ad, rxve);
	      if (n_trace)
		avf_input_trace (vm, node, next1, b1, &n_trace, ad, rxve + 1);
	      if (n_trace)
		avf_input_trace (vm, node, next2, b2, &n_trace, ad, rxve + 2);
	      if (n_trace)
		avf_input_trace (vm, node, next3, b3, &n_trace, ad, rxve + 3);
	    }

	  /* next */
	  to_next += 4;
	  n_left_to_next -= 4;
	  rxve += 4;
	  n_rxv -= 4;

	  /* enqueue */
	  vlib_validate_buffer_enqueue_x4 (vm, node, next_index, to_next,
					   n_left_to_next, bi0, bi1, bi2, bi3,
					   next0, next1, next2, next3);
	}
      while (n_rxv && n_left_to_next)
	{
	  bi0 = rxve[0].bi;
	  to_next[0] = bi0;
	  b0 = vlib_get_buffer (vm, bi0);

	  b0->current_length = rxve->length;
	  n_rx_bytes += b0->current_length;

	  if (PREDICT_TRUE (ad->per_interface_next_index == ~0))
	    {
	      next0 = avf_find_next (rxve, b0, 1);
	      if (with_features_or_tracing)
		vnet_feature_start_device_input_x1 (ad->sw_if_index, &next0,
						    b0);
	      avf_check_for_error (node, rxve + 0, b0, &next0);
	    }
	  else
	    next0 = ad->per_interface_next_index;

	  clib_memcpy (vnet_buffer (b0)->sw_if_index, sw_if_idx,
		       sizeof (sw_if_idx));

	  VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
	  if (with_features_or_tracing && PREDICT_FALSE (n_trace > 0))
	    avf_input_trace (vm, node, next0, b0, &n_trace, ad, rxve);

	  /* next */
	  to_next += 1;
	  n_left_to_next -= 1;
	  rxve += 1;
	  n_rxv -= 1;

	  /* enqueue */
	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
					   n_left_to_next, bi0, next0);
	}
      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
				   + VNET_INTERFACE_COUNTER_RX, thr_idx,
				   ad->hw_if_index, n_rx_packets, n_rx_bytes);

  return n_rx_packets;
}

uword
CLIB_MULTIARCH_FN (avf_input) (vlib_main_t * vm, vlib_node_runtime_t * node,
			       vlib_frame_t * frame)
{
  u32 n_rx = 0;
  avf_main_t *am = &avf_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)
  {
    avf_device_t *ad;
    ad = vec_elt_at_index (am->devices, dq->dev_instance);
    if ((ad->flags & AVF_DEVICE_F_ADMIN_UP) == 0)
      continue;
    if (vnet_device_input_have_features (ad->sw_if_index) ||
	vlib_get_trace_count (vm, node))
      n_rx += avf_device_input_inline (vm, node, frame, ad, dq->queue_id, 1);
    else
      n_rx += avf_device_input_inline (vm, node, frame, ad, dq->queue_id, 0);
  }
  return n_rx;
}

#ifndef CLIB_MULTIARCH_VARIANT
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (avf_input_node) = {
  .function = avf_input,
  .name = "avf-input",
  .sibling_of = "device-input",
  .format_trace = format_avf_input_trace,
  .type = VLIB_NODE_TYPE_INPUT,
  .state = VLIB_NODE_STATE_DISABLED,
  .n_errors = AVF_INPUT_N_ERROR,
  .error_strings = avf_input_error_strings,
};

#if __x86_64__
vlib_node_function_t __clib_weak avf_input_avx512;
vlib_node_function_t __clib_weak avf_input_avx2;
static void __clib_constructor
avf_input_multiarch_select (void)
{
  if (avf_input_avx512 && clib_cpu_supports_avx512f ())
    avf_input_node.function = avf_input_avx512;
  else if (avf_input_avx2 && clib_cpu_supports_avx2 ())
    avf_input_node.function = avf_input_avx2;
}

#endif
#endif

/* *INDENT-ON* */


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