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:
8 * http://www.apache.org/licenses/LICENSE-2.0
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 *------------------------------------------------------------------
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>
24 #include <rdma/rdma.h>
26 #define foreach_rdma_input_error \
27 _(BUFFER_ALLOC, "buffer alloc error")
31 #define _(f,s) RDMA_INPUT_ERROR_##f,
32 foreach_rdma_input_error
37 static __clib_unused char *rdma_input_error_strings[] = {
39 foreach_rdma_input_error
44 static_always_inline void
45 ibv_set_recv_wr_and_sge (struct ibv_recv_wr *w, struct ibv_sge *s, u64 va,
46 u32 data_size, u32 lkey)
49 s[0].length = data_size;
56 static_always_inline void
57 rdma_device_input_refill (vlib_main_t * vm, rdma_device_t * rd,
61 struct ibv_recv_wr wr[VLIB_FRAME_SIZE], *w = wr;
62 struct ibv_sge sge[VLIB_FRAME_SIZE], *s = sge;
63 u32 mask = rxq->size - 1;
64 u32 slot = rxq->tail & mask;
65 u32 *bufs = rxq->bufs + slot;
66 u32 data_size = vlib_buffer_get_default_data_size (vm);
69 /* do not enqueue more packet than ring space */
70 n_alloc = clib_min (VLIB_FRAME_SIZE, rxq->size - (rxq->tail - rxq->head));
72 /* do not bother to allocate if too small */
76 /* avoid wrap-around logic in core loop */
77 n_alloc = clib_min (n_alloc, rxq->size - slot);
79 n_alloc &= ~7; /* round to 8 */
81 n = vlib_buffer_alloc_to_ring_from_pool (vm, rxq->bufs, slot, rxq->size,
84 if (PREDICT_FALSE (n != n_alloc))
90 vlib_buffer_free_from_ring (vm, rxq->bufs, slot, rxq->size, n);
94 /* partial allocation, round and return rest */
98 vlib_buffer_free_from_ring (vm, rxq->bufs, (slot + n) & mask,
107 if (PREDICT_TRUE (n >= 16))
109 clib_prefetch_store (s + 16);
110 clib_prefetch_store (w + 16);
113 vlib_get_buffers_with_offset (vm, bufs, (void **) va, 8,
114 sizeof (vlib_buffer_t));
116 ibv_set_recv_wr_and_sge (w++, s++, va[0], data_size, lkey);
117 ibv_set_recv_wr_and_sge (w++, s++, va[1], data_size, lkey);
118 ibv_set_recv_wr_and_sge (w++, s++, va[2], data_size, lkey);
119 ibv_set_recv_wr_and_sge (w++, s++, va[3], data_size, lkey);
120 ibv_set_recv_wr_and_sge (w++, s++, va[4], data_size, lkey);
121 ibv_set_recv_wr_and_sge (w++, s++, va[5], data_size, lkey);
122 ibv_set_recv_wr_and_sge (w++, s++, va[6], data_size, lkey);
123 ibv_set_recv_wr_and_sge (w++, s++, va[7], data_size, lkey);
129 w[-1].next = 0; /* fix next pointer in WR linked-list last item */
132 if (ibv_post_wq_recv (rxq->wq, wr, &w) != 0)
135 vlib_buffer_free_from_ring (vm, rxq->bufs, slot + n, rxq->size,
142 static_always_inline void
143 rdma_device_input_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
144 const rdma_device_t * rd, u32 n_left, const u32 * bi,
149 if (PREDICT_TRUE (0 == (n_trace = vlib_get_trace_count (vm, node))))
153 while (n_trace && n_left)
156 rdma_input_trace_t *tr;
157 b = vlib_get_buffer (vm, bi[0]);
158 vlib_trace_buffer (vm, node, next_index, b,
159 /* follow_chain */ 0);
160 tr = vlib_add_trace (vm, node, b, sizeof (*tr));
161 tr->next_index = next_index;
162 tr->hw_if_index = rd->hw_if_index;
170 vlib_set_trace_count (vm, node, n_trace);
173 static_always_inline void
174 rdma_device_input_ethernet (vlib_main_t * vm, vlib_node_runtime_t * node,
175 const rdma_device_t * rd, u32 next_index)
177 vlib_next_frame_t *nf;
179 ethernet_input_frame_t *ef;
181 if (PREDICT_FALSE (VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT != next_index))
185 vlib_node_runtime_get_next_frame (vm, node,
186 VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT);
187 f = vlib_get_frame (vm, nf->frame);
188 f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX;
189 /* FIXME: f->flags |= ETH_INPUT_FRAME_F_IP4_CKSUM_OK; */
191 ef = vlib_frame_scalar_args (f);
192 ef->sw_if_index = rd->sw_if_index;
193 ef->hw_if_index = rd->hw_if_index;
196 static_always_inline u32
197 rdma_device_input_bufs (vlib_main_t * vm, const rdma_device_t * rd, u32 * bi,
198 struct ibv_wc * wc, u32 n_left_from,
201 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
204 vlib_get_buffers (vm, bi, bufs, n_left_from);
205 ASSERT (bt->buffer_pool_index == bufs[0]->buffer_pool_index);
207 while (n_left_from >= 4)
209 if (PREDICT_TRUE (n_left_from >= 8))
211 CLIB_PREFETCH (&wc[4 + 0], CLIB_CACHE_LINE_BYTES, LOAD);
212 CLIB_PREFETCH (&wc[4 + 1], CLIB_CACHE_LINE_BYTES, LOAD);
213 CLIB_PREFETCH (&wc[4 + 2], CLIB_CACHE_LINE_BYTES, LOAD);
214 CLIB_PREFETCH (&wc[4 + 3], CLIB_CACHE_LINE_BYTES, LOAD);
215 vlib_prefetch_buffer_header (b[4 + 0], STORE);
216 vlib_prefetch_buffer_header (b[4 + 1], STORE);
217 vlib_prefetch_buffer_header (b[4 + 2], STORE);
218 vlib_prefetch_buffer_header (b[4 + 3], STORE);
221 vlib_buffer_copy_template (b[0], bt);
222 vlib_buffer_copy_template (b[1], bt);
223 vlib_buffer_copy_template (b[2], bt);
224 vlib_buffer_copy_template (b[3], bt);
226 n_rx_bytes += b[0]->current_length = wc[0].byte_len;
227 n_rx_bytes += b[1]->current_length = wc[1].byte_len;
228 n_rx_bytes += b[2]->current_length = wc[2].byte_len;
229 n_rx_bytes += b[3]->current_length = wc[3].byte_len;
236 while (n_left_from >= 1)
238 vlib_buffer_copy_template (b[0], bt);
239 n_rx_bytes += b[0]->current_length = wc[0].byte_len;
249 static_always_inline uword
250 rdma_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
251 vlib_frame_t * frame, rdma_device_t * rd, u16 qid)
253 rdma_main_t *rm = &rdma_main;
254 vnet_main_t *vnm = vnet_get_main ();
255 rdma_per_thread_data_t *ptd = vec_elt_at_index (rm->per_thread_data,
257 rdma_rxq_t *rxq = vec_elt_at_index (rd->rxqs, qid);
258 struct ibv_wc wc[VLIB_FRAME_SIZE];
260 u32 next_index, *to_next, n_left_to_next;
261 u32 n_rx_packets, n_rx_bytes;
262 u32 mask = rxq->size - 1;
264 ASSERT (rxq->size >= VLIB_FRAME_SIZE && is_pow2 (rxq->size));
265 ASSERT (rxq->tail - rxq->head <= rxq->size);
267 n_rx_packets = ibv_poll_cq (rxq->cq, VLIB_FRAME_SIZE, wc);
268 ASSERT (n_rx_packets <= rxq->tail - rxq->head);
270 if (PREDICT_FALSE (n_rx_packets <= 0))
273 /* init buffer template */
274 vlib_buffer_copy_template (&bt, &ptd->buffer_template);
275 vnet_buffer (&bt)->sw_if_index[VLIB_RX] = rd->sw_if_index;
276 bt.buffer_pool_index = rd->pool;
278 /* update buffer template for input feature arcs if any */
279 next_index = rd->per_interface_next_index;
280 if (PREDICT_FALSE (vnet_device_input_have_features (rd->sw_if_index)))
281 vnet_feature_start_device_input_x1 (rd->sw_if_index, &next_index, &bt);
283 vlib_get_new_next_frame (vm, node, next_index, to_next, n_left_to_next);
284 ASSERT (n_rx_packets <= n_left_to_next);
286 vlib_buffer_copy_indices_from_ring (to_next, rxq->bufs, rxq->head & mask,
287 rxq->size, n_rx_packets);
288 n_rx_bytes = rdma_device_input_bufs (vm, rd, to_next, wc, n_rx_packets,
291 rdma_device_input_ethernet (vm, node, rd, next_index);
293 vlib_put_next_frame (vm, node, next_index, n_left_to_next - n_rx_packets);
295 rxq->head += n_rx_packets;
297 rdma_device_input_trace (vm, node, rd, n_rx_packets, to_next, next_index);
299 vlib_increment_combined_counter
300 (vnm->interface_main.combined_sw_if_counters +
301 VNET_INTERFACE_COUNTER_RX, vm->thread_index,
302 rd->hw_if_index, n_rx_packets, n_rx_bytes);
305 rdma_device_input_refill (vm, rd, rxq);
310 VLIB_NODE_FN (rdma_input_node) (vlib_main_t * vm,
311 vlib_node_runtime_t * node,
312 vlib_frame_t * frame)
315 rdma_main_t *rm = &rdma_main;
316 vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
317 vnet_device_and_queue_t *dq;
319 foreach_device_and_queue (dq, rt->devices_and_queues)
322 rd = vec_elt_at_index (rm->devices, dq->dev_instance);
323 if (PREDICT_TRUE (rd->flags & RDMA_DEVICE_F_ADMIN_UP))
324 n_rx += rdma_device_input_inline (vm, node, frame, rd, dq->queue_id);
330 VLIB_REGISTER_NODE (rdma_input_node) = {
331 .name = "rdma-input",
332 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
333 .sibling_of = "device-input",
334 .format_trace = format_rdma_input_trace,
335 .type = VLIB_NODE_TYPE_INPUT,
336 .state = VLIB_NODE_STATE_DISABLED,
337 .n_errors = RDMA_INPUT_N_ERROR,
338 .error_strings = rdma_input_error_strings,
345 * fd.io coding-style-patch-verification: ON
348 * eval: (c-set-style "gnu")