diff options
author | Benoît Ganne <bganne@cisco.com> | 2019-08-21 15:11:43 +0200 |
---|---|---|
committer | Damjan Marion <dmarion@me.com> | 2019-09-25 22:08:43 +0000 |
commit | 4fffc536f4beb6b7cc3c68835f4fbde45366a9ab (patch) | |
tree | a027525759bbd05109f7403d49f57bc198ed1682 /src/plugins/rdma | |
parent | 264dce73a57ebcaea02f09ca9a98dec80d3d91d2 (diff) |
rdma: use rings for buffers management
Refactor rdma driver for improved performance and prepare for raw
datapath access.
Type: refactor
Change-Id: Iae31872055a6947708ea9f430bd1dc083ea63b5a
Signed-off-by: Benoît Ganne <bganne@cisco.com>
Diffstat (limited to 'src/plugins/rdma')
-rw-r--r-- | src/plugins/rdma/device.c | 92 | ||||
-rw-r--r-- | src/plugins/rdma/format.c | 4 | ||||
-rw-r--r-- | src/plugins/rdma/input.c | 181 | ||||
-rw-r--r-- | src/plugins/rdma/output.c | 135 | ||||
-rw-r--r-- | src/plugins/rdma/rdma.h | 34 |
5 files changed, 243 insertions, 203 deletions
diff --git a/src/plugins/rdma/device.c b/src/plugins/rdma/device.c index 62dff21b060..532f4f530ab 100644 --- a/src/plugins/rdma/device.c +++ b/src/plugins/rdma/device.c @@ -266,8 +266,7 @@ rdma_async_event_error_ready (clib_file_t * f) { rdma_main_t *rm = &rdma_main; rdma_device_t *rd = vec_elt_at_index (rm->devices, f->private_data); - return clib_error_return (0, "RDMA async event error for device %U", - format_vlib_pci_addr, &rd->pci_addr); + return clib_error_return (0, "RDMA: %s: async event error", rd->name); } static clib_error_t * @@ -293,8 +292,7 @@ rdma_async_event_read_ready (clib_file_t * f) case IBV_EVENT_DEVICE_FATAL: rd->flags &= ~RDMA_DEVICE_F_LINK_UP; vnet_hw_interface_set_flags (vnm, rd->hw_if_index, 0); - vlib_log_emerg (rm->log_class, "Fatal RDMA error for device %U", - format_vlib_pci_addr, &rd->pci_addr); + vlib_log_emerg (rm->log_class, "%s: fatal error", rd->name); break; default: rdma_log__ (VLIB_LOG_LEVEL_ERR, rd, "unhandeld RDMA async event %i", @@ -326,8 +324,7 @@ rdma_async_event_init (rdma_device_t * rd) t.file_descriptor = rd->ctx->async_fd; t.error_function = rdma_async_event_error_ready; t.private_data = rd->dev_instance; - t.description = - format (0, "RMDA %U async event", format_vlib_pci_addr, &rd->pci_addr); + t.description = format (0, "%s async event", rd->name); rd->async_event_clib_file_index = clib_file_add (&file_main, &t); return 0; @@ -393,6 +390,7 @@ rdma_dev_cleanup (rdma_device_t * rd) vec_free (rd->rxqs); vec_free (rd->txqs); vec_free (rd->name); + vlib_pci_free_device_info (rd->pci); pool_put (rm->devices, rd); } @@ -406,6 +404,7 @@ rdma_rxq_init (vlib_main_t * vm, rdma_device_t * rd, u16 qid, u32 n_desc) vec_validate_aligned (rd->rxqs, qid, CLIB_CACHE_LINE_BYTES); rxq = vec_elt_at_index (rd->rxqs, qid); rxq->size = n_desc; + vec_validate_aligned (rxq->bufs, n_desc - 1, CLIB_CACHE_LINE_BYTES); if ((rxq->cq = ibv_create_cq (rd->ctx, n_desc, NULL, NULL, 0)) == 0) return clib_error_return_unix (0, "Create CQ Failed"); @@ -482,6 +481,7 @@ rdma_txq_init (vlib_main_t * vm, rdma_device_t * rd, u16 qid, u32 n_desc) vec_validate_aligned (rd->txqs, qid, CLIB_CACHE_LINE_BYTES); txq = vec_elt_at_index (rd->txqs, qid); txq->size = n_desc; + vec_validate_aligned (txq->bufs, n_desc - 1, CLIB_CACHE_LINE_BYTES); if ((txq->cq = ibv_create_cq (rd->ctx, n_desc, NULL, NULL, 0)) == 0) return clib_error_return_unix (0, "Create CQ Failed"); @@ -492,7 +492,6 @@ rdma_txq_init (vlib_main_t * vm, rdma_device_t * rd, u16 qid, u32 n_desc) qpia.cap.max_send_wr = n_desc; qpia.cap.max_send_sge = 1; qpia.qp_type = IBV_QPT_RAW_PACKET; - qpia.sq_sig_all = 1; if ((txq->qp = ibv_create_qp (rd->pd, &qpia)) == 0) return clib_error_return_unix (0, "Queue Pair create failed"); @@ -549,6 +548,7 @@ rdma_dev_init (vlib_main_t * vm, rdma_device_t * rd, u32 rxq_size, bm->buffer_mem_size, IBV_ACCESS_LOCAL_WRITE)) == 0) return clib_error_return_unix (0, "Register MR Failed"); + rd->lkey = rd->mr->lkey; /* avoid indirection in datapath */ return 0; } @@ -573,11 +573,13 @@ rdma_create_if (vlib_main_t * vm, rdma_create_if_args_t * args) { vnet_main_t *vnm = vnet_get_main (); rdma_main_t *rm = &rdma_main; - rdma_device_t *rd = 0; - struct ibv_device **dev_list = 0; + rdma_device_t *rd; + vlib_pci_addr_t pci_addr; + struct ibv_device **dev_list; int n_devs; - u8 *s = 0, *s2 = 0; + u8 *s; u16 qid; + int i; args->rxq_size = args->rxq_size ? args->rxq_size : 2 * VLIB_FRAME_SIZE; args->txq_size = args->txq_size ? args->txq_size : 2 * VLIB_FRAME_SIZE; @@ -588,54 +590,57 @@ rdma_create_if (vlib_main_t * vm, rdma_create_if_args_t * args) args->rv = VNET_API_ERROR_INVALID_VALUE; args->error = clib_error_return (0, "rx queue number must be a power of two"); - return; + goto err0; } - if (!is_pow2 (args->rxq_size) || !is_pow2 (args->txq_size)) + if (args->rxq_size < VLIB_FRAME_SIZE || args->txq_size < VLIB_FRAME_SIZE || + !is_pow2 (args->rxq_size) || !is_pow2 (args->txq_size)) { args->rv = VNET_API_ERROR_INVALID_VALUE; args->error = - clib_error_return (0, "queue size must be a power of two"); - return; + clib_error_return (0, "queue size must be a power of two >= %i", + VLIB_FRAME_SIZE); + goto err0; } - pool_get_zero (rm->devices, rd); - rd->dev_instance = rd - rm->devices; - rd->per_interface_next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; - rd->name = vec_dup (args->name); - - /* check if device exist and if it is bound to mlx5_core */ - s = format (s, "/sys/class/net/%s/device/driver/module%c", args->ifname, 0); - s2 = clib_sysfs_link_to_name ((char *) s); - - if (s2 == 0 || strncmp ((char *) s2, "mlx5_core", 9) != 0) + dev_list = ibv_get_device_list (&n_devs); + if (n_devs == 0) { args->error = - clib_error_return (0, - "invalid interface (only mlx5 supported for now)"); + clib_error_return_unix (0, + "no RDMA devices available. Is the ib_uverbs module loaded?"); goto err0; } - /* extract PCI address */ - vec_reset_length (s); - s = format (s, "/sys/class/net/%s/device%c", args->ifname, 0); - if (sysfs_path_to_pci_addr ((char *) s, &rd->pci_addr) == 0) + /* get PCI address */ + s = format (0, "/sys/class/net/%s/device%c", args->ifname, 0); + if (sysfs_path_to_pci_addr ((char *) s, &pci_addr) == 0) { - args->error = clib_error_return (0, "cannot find PCI address"); - goto err0; + args->error = + clib_error_return (0, "cannot find PCI address for device "); + goto err1; } - dev_list = ibv_get_device_list (&n_devs); - if (n_devs == 0) + pool_get_zero (rm->devices, rd); + rd->dev_instance = rd - rm->devices; + rd->per_interface_next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; + rd->name = format (0, "%s", args->name); + rd->linux_ifname = format (0, "%s", args->ifname); + + rd->pci = vlib_pci_get_device_info (vm, &pci_addr, &args->error); + if (!rd->pci) + goto err2; + rd->pool = vlib_buffer_pool_get_default_for_numa (vm, rd->pci->numa_node); + + if (strncmp ((char *) rd->pci->driver_name, "mlx5_core", 9)) { args->error = - clib_error_return_unix (0, - "no RDMA devices available, errno = %d. " - "Is the ib_uverbs module loaded?", errno); - goto err0; + clib_error_return (0, + "invalid interface (only mlx5 supported for now)"); + goto err2; } - for (int i = 0; i < n_devs; i++) + for (i = 0; i < n_devs; i++) { vlib_pci_addr_t addr; @@ -645,7 +650,7 @@ rdma_create_if (vlib_main_t * vm, rdma_create_if_args_t * args) if (sysfs_path_to_pci_addr ((char *) s, &addr) == 0) continue; - if (addr.as_u32 != rd->pci_addr.as_u32) + if (addr.as_u32 != rd->pci->addr.as_u32) continue; if ((rd->ctx = ibv_open_device (dev_list[i]))) @@ -654,7 +659,7 @@ rdma_create_if (vlib_main_t * vm, rdma_create_if_args_t * args) if ((args->error = rdma_dev_init (vm, rd, args->rxq_size, args->txq_size, args->rxq_num))) - goto err1; + goto err2; if ((args->error = rdma_register_interface (vnm, rd))) goto err2; @@ -675,6 +680,8 @@ rdma_create_if (vlib_main_t * vm, rdma_create_if_args_t * args) rdma_input_node.index); vec_foreach_index (qid, rd->rxqs) vnet_hw_interface_assign_rx_thread (vnm, rd->hw_if_index, qid, ~0); + + vec_free (s); return; err3: @@ -683,10 +690,9 @@ err2: rdma_dev_cleanup (rd); err1: ibv_free_device_list (dev_list); -err0: - vec_free (s2); vec_free (s); args->rv = VNET_API_ERROR_INVALID_INTERFACE; +err0: vlib_log_err (rm->log_class, "%U", format_clib_error, args->error); } diff --git a/src/plugins/rdma/format.c b/src/plugins/rdma/format.c index fbd40676639..798b21d565d 100644 --- a/src/plugins/rdma/format.c +++ b/src/plugins/rdma/format.c @@ -59,7 +59,9 @@ format_rdma_device (u8 * s, va_list * args) rdma_device_t *rd = vec_elt_at_index (rm->devices, i); u32 indent = format_get_indent (s); - s = format (s, "flags: %U", format_rdma_device_flags, rd); + s = format (s, "netdev: %s\n", rd->linux_ifname); + s = format (s, "%Uflags: %U", format_white_space, indent, + format_rdma_device_flags, rd); if (rd->error) s = format (s, "\n%Uerror %U", format_white_space, indent, format_clib_error, rd->error); diff --git a/src/plugins/rdma/input.c b/src/plugins/rdma/input.c index b2f3c280a06..3c9481f2e07 100644 --- a/src/plugins/rdma/input.c +++ b/src/plugins/rdma/input.c @@ -45,17 +45,30 @@ rdma_device_input_refill (vlib_main_t * vm, rdma_device_t * rd, rdma_rxq_t * rxq) { u32 n_alloc, n; - u32 buffers[VLIB_FRAME_SIZE], *bi = buffers; vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; struct ibv_recv_wr wr[VLIB_FRAME_SIZE], *w = wr; struct ibv_sge sge[VLIB_FRAME_SIZE], *s = sge; + u32 slot = rxq->tail & (rxq->size - 1); - if (PREDICT_FALSE (rxq->n_enq >= rxq->size)) + /* do not enqueue more packet than ring space */ + n_alloc = clib_min (VLIB_FRAME_SIZE, rxq->size - (rxq->tail - rxq->head)); + + /* do not bother to allocate if too small */ + if (n_alloc < 16) + return; + + /* avoid wrap-around logic in core loop */ + n_alloc = clib_min (n_alloc, rxq->size - slot); + + n = n_alloc = + vlib_buffer_alloc_to_ring_from_pool (vm, rxq->bufs, slot, rxq->size, + n_alloc, rd->pool); + + /* if ring is full or allocation error, do nothing */ + if (PREDICT_FALSE (0 == n_alloc)) return; - n_alloc = clib_min (VLIB_FRAME_SIZE, rxq->size - rxq->n_enq); - n_alloc = n = vlib_buffer_alloc (vm, buffers, n_alloc); - vlib_get_buffers (vm, buffers, bufs, n_alloc); + vlib_get_buffers (vm, &rxq->bufs[slot], bufs, n_alloc); while (n >= 4) { @@ -67,42 +80,37 @@ rdma_device_input_refill (vlib_main_t * vm, rdma_device_t * rd, s[0].addr = vlib_buffer_get_va (b[0]); s[0].length = vlib_buffer_get_default_data_size (vm); - s[0].lkey = rd->mr->lkey; + s[0].lkey = rd->lkey; s[1].addr = vlib_buffer_get_va (b[1]); s[1].length = vlib_buffer_get_default_data_size (vm); - s[1].lkey = rd->mr->lkey; + s[1].lkey = rd->lkey; s[2].addr = vlib_buffer_get_va (b[2]); s[2].length = vlib_buffer_get_default_data_size (vm); - s[2].lkey = rd->mr->lkey; + s[2].lkey = rd->lkey; s[3].addr = vlib_buffer_get_va (b[3]); s[3].length = vlib_buffer_get_default_data_size (vm); - s[3].lkey = rd->mr->lkey; + s[3].lkey = rd->lkey; - w[0].wr_id = bi[0]; w[0].next = &w[0] + 1; w[0].sg_list = &s[0]; w[0].num_sge = 1; - w[1].wr_id = bi[1]; w[1].next = &w[1] + 1; w[1].sg_list = &s[1]; w[1].num_sge = 1; - w[2].wr_id = bi[2]; w[2].next = &w[2] + 1; w[2].sg_list = &s[2]; w[2].num_sge = 1; - w[3].wr_id = bi[3]; w[3].next = &w[3] + 1; w[3].sg_list = &s[3]; w[3].num_sge = 1; s += 4; - bi += 4; w += 4; b += 4; n -= 4; @@ -112,15 +120,13 @@ rdma_device_input_refill (vlib_main_t * vm, rdma_device_t * rd, { s[0].addr = vlib_buffer_get_va (b[0]); s[0].length = vlib_buffer_get_default_data_size (vm); - s[0].lkey = rd->mr->lkey; + s[0].lkey = rd->lkey; - w[0].wr_id = bi[0]; w[0].next = &w[0] + 1; w[0].sg_list = &s[0]; w[0].num_sge = 1; s += 1; - bi += 1; w += 1; b += 1; n -= 1; @@ -132,10 +138,11 @@ rdma_device_input_refill (vlib_main_t * vm, rdma_device_t * rd, if (ibv_post_wq_recv (rxq->wq, wr, &w) != 0) { n = w - wr; - vlib_buffer_free (vm, buffers + n, n_alloc - n); + vlib_buffer_free_from_ring (vm, rxq->bufs, slot + n, rxq->size, + n_alloc - n); } - rxq->n_enq += n; + rxq->tail += n; } static_always_inline void @@ -193,11 +200,16 @@ rdma_device_input_ethernet (vlib_main_t * vm, vlib_node_runtime_t * node, } static_always_inline u32 -rdma_device_input_load_wc (u32 n_left_from, struct ibv_wc * wc, u32 * to_next, - u32 * bufsz) +rdma_device_input_bufs (vlib_main_t * vm, const rdma_device_t * rd, + u32 * next, u32 * bi, struct ibv_wc * wc, + u32 n_left_from, vlib_buffer_t * bt) { + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; u32 n_rx_bytes[4] = { 0 }; + vlib_get_buffers (vm, bi, bufs, n_left_from); + ASSERT (bt->buffer_pool_index == bufs[0]->buffer_pool_index); + while (n_left_from >= 4) { if (PREDICT_TRUE (n_left_from >= 8)) @@ -206,92 +218,53 @@ rdma_device_input_load_wc (u32 n_left_from, struct ibv_wc * wc, u32 * to_next, CLIB_PREFETCH (&wc[4 + 1], CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (&wc[4 + 2], CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (&wc[4 + 3], CLIB_CACHE_LINE_BYTES, LOAD); - CLIB_PREFETCH (&bufsz[4 + 0], 4 * sizeof (bufsz[0]), STORE); - CLIB_PREFETCH (&to_next[4 + 0], 4 * sizeof (to_next[0]), STORE); + vlib_prefetch_buffer_header (b[4 + 0], STORE); + vlib_prefetch_buffer_header (b[4 + 1], STORE); + vlib_prefetch_buffer_header (b[4 + 2], STORE); + vlib_prefetch_buffer_header (b[4 + 3], STORE); } - to_next[0] = wc[0].wr_id; - to_next[1] = wc[1].wr_id; - to_next[2] = wc[2].wr_id; - to_next[3] = wc[3].wr_id; + vlib_buffer_copy_indices (next, bi, 4); - bufsz[0] = wc[0].byte_len; - bufsz[1] = wc[1].byte_len; - bufsz[2] = wc[2].byte_len; - bufsz[3] = wc[3].byte_len; + vlib_buffer_copy_template (b[0], bt); + vlib_buffer_copy_template (b[1], bt); + vlib_buffer_copy_template (b[2], bt); + vlib_buffer_copy_template (b[3], bt); + + b[0]->current_length = wc[0].byte_len; + b[1]->current_length = wc[1].byte_len; + b[2]->current_length = wc[2].byte_len; + b[3]->current_length = wc[3].byte_len; n_rx_bytes[0] += wc[0].byte_len; n_rx_bytes[1] += wc[1].byte_len; n_rx_bytes[2] += wc[2].byte_len; n_rx_bytes[3] += wc[3].byte_len; + next += 4; + bi += 4; + b += 4; wc += 4; - to_next += 4; - bufsz += 4; n_left_from -= 4; } while (n_left_from >= 1) { - to_next[0] = wc[0].wr_id; - bufsz[0] = wc[0].byte_len; + vlib_buffer_copy_indices (next, bi, 1); + vlib_buffer_copy_template (b[0], bt); + b[0]->current_length = wc[0].byte_len; n_rx_bytes[0] += wc[0].byte_len; + next += 1; + bi += 1; + b += 1; wc += 1; - to_next += 1; - bufsz += 1; n_left_from -= 1; } return n_rx_bytes[0] + n_rx_bytes[1] + n_rx_bytes[2] + n_rx_bytes[3]; } -static_always_inline void -rdma_device_input_bufs_init (u32 n_left_from, vlib_buffer_t ** bufs, - u32 * bufsz, u32 sw_if_index, vlib_buffer_t * bt) -{ - vnet_buffer (bt)->sw_if_index[VLIB_RX] = sw_if_index; - vnet_buffer (bt)->sw_if_index[VLIB_TX] = ~0; - bt->buffer_pool_index = bufs[0]->buffer_pool_index; - bt->ref_count = 1; - - while (n_left_from >= 4) - { - if (PREDICT_TRUE (n_left_from >= 8)) - { - vlib_prefetch_buffer_header (bufs[4 + 0], STORE); - vlib_prefetch_buffer_header (bufs[4 + 1], STORE); - vlib_prefetch_buffer_header (bufs[4 + 2], STORE); - vlib_prefetch_buffer_header (bufs[4 + 3], STORE); - CLIB_PREFETCH (&bufsz[4 + 0], 4 * sizeof (bufsz[0]), LOAD); - } - - vlib_buffer_copy_template (bufs[0], bt); - vlib_buffer_copy_template (bufs[1], bt); - vlib_buffer_copy_template (bufs[2], bt); - vlib_buffer_copy_template (bufs[3], bt); - - bufs[0]->current_length = bufsz[0]; - bufs[1]->current_length = bufsz[1]; - bufs[2]->current_length = bufsz[2]; - bufs[3]->current_length = bufsz[3]; - - bufs += 4; - bufsz += 4; - n_left_from -= 4; - } - - while (n_left_from >= 1) - { - vlib_buffer_copy_template (bufs[0], bt); - bufs[0]->current_length = bufsz[0]; - - bufs += 1; - bufsz += 1; - n_left_from -= 1; - } -} - static_always_inline uword rdma_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, rdma_device_t * rd, u16 qid) @@ -299,12 +272,16 @@ rdma_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vnet_main_t *vnm = vnet_get_main (); rdma_rxq_t *rxq = vec_elt_at_index (rd->rxqs, qid); struct ibv_wc wc[VLIB_FRAME_SIZE]; - u32 bufsz[VLIB_FRAME_SIZE]; - vlib_buffer_t *bufs[VLIB_FRAME_SIZE], bt; + vlib_buffer_t bt; u32 next_index, *to_next, n_left_to_next; u32 n_rx_packets, n_rx_bytes; + u32 slot, n_tail; + + ASSERT (rxq->size >= VLIB_FRAME_SIZE && is_pow2 (rxq->size)); + ASSERT (rxq->tail - rxq->head <= rxq->size); n_rx_packets = ibv_poll_cq (rxq->cq, VLIB_FRAME_SIZE, wc); + ASSERT (n_rx_packets <= rxq->tail - rxq->head); if (PREDICT_FALSE (n_rx_packets <= 0)) { @@ -312,30 +289,50 @@ rdma_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, return 0; } + /* init buffer template */ clib_memset_u64 (&bt, 0, STRUCT_OFFSET_OF (vlib_buffer_t, template_end) / sizeof (u64)); + vnet_buffer (&bt)->sw_if_index[VLIB_RX] = rd->sw_if_index; + vnet_buffer (&bt)->sw_if_index[VLIB_TX] = ~0; + bt.buffer_pool_index = rd->pool; + bt.ref_count = 1; + + /* update buffer template for input feature arcs if any */ next_index = rd->per_interface_next_index; if (PREDICT_FALSE (vnet_device_input_have_features (rd->sw_if_index))) vnet_feature_start_device_input_x1 (rd->sw_if_index, &next_index, &bt); vlib_get_new_next_frame (vm, node, next_index, to_next, n_left_to_next); - n_rx_bytes = rdma_device_input_load_wc (n_rx_packets, wc, to_next, bufsz); - vlib_get_buffers (vm, to_next, bufs, n_rx_packets); - rdma_device_input_bufs_init (n_rx_packets, bufs, bufsz, rd->sw_if_index, - &bt); - rdma_device_input_trace (vm, node, rd, n_rx_packets, to_next, next_index); + ASSERT (n_rx_packets <= n_left_to_next); + + /* + * avoid wrap-around logic in core loop + * we requested VLIB_FRAME_SIZE packets and rxq->size >= VLIB_FRAME_SIZE + * => we can process all packets in 2 iterations max + */ + slot = rxq->head & (rxq->size - 1); + n_tail = clib_min (n_rx_packets, rxq->size - slot); + n_rx_bytes = + rdma_device_input_bufs (vm, rd, &to_next[0], &rxq->bufs[slot], wc, n_tail, + &bt); + if (n_tail < n_rx_packets) + n_rx_bytes += + rdma_device_input_bufs (vm, rd, &to_next[n_tail], &rxq->bufs[0], wc, + n_rx_packets - n_tail, &bt); rdma_device_input_ethernet (vm, node, rd, next_index); vlib_put_next_frame (vm, node, next_index, n_left_to_next - n_rx_packets); + rxq->head += n_rx_packets; + + rdma_device_input_trace (vm, node, rd, n_rx_packets, to_next, next_index); + vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, vm->thread_index, rd->hw_if_index, n_rx_packets, n_rx_bytes); - rxq->n_enq -= n_rx_packets; - rdma_device_input_refill (vm, rd, rxq); return n_rx_packets; diff --git a/src/plugins/rdma/output.c b/src/plugins/rdma/output.c index ddda81a4b19..0c6848e09cd 100644 --- a/src/plugins/rdma/output.c +++ b/src/plugins/rdma/output.c @@ -28,46 +28,45 @@ static_always_inline void rdma_device_output_free (vlib_main_t * vm, rdma_txq_t * txq) { struct ibv_wc wc[VLIB_FRAME_SIZE]; - u32 to_free[VLIB_FRAME_SIZE]; - int n_free; - int i; + u32 tail, slot; + int n; - n_free = ibv_poll_cq (txq->cq, VLIB_FRAME_SIZE, wc); - if (n_free <= 0) + n = ibv_poll_cq (txq->cq, VLIB_FRAME_SIZE, wc); + if (n <= 0) return; - for (i = 0; i < n_free; i++) - to_free[i] = wc[i].wr_id; - - vlib_buffer_free (vm, to_free, n_free); + tail = wc[n - 1].wr_id; + slot = txq->head & (txq->size - 1); + vlib_buffer_free_from_ring (vm, txq->bufs, slot, txq->size, + tail - txq->head); + txq->head = tail; } -VNET_DEVICE_CLASS_TX_FN (rdma_device_class) (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) +static_always_inline u32 +rmda_device_output_tx (vlib_main_t * vm, const rdma_device_t * rd, + rdma_txq_t * txq, u32 n_left_from, u32 * bi) { - rdma_main_t *rm = &rdma_main; - vnet_interface_output_runtime_t *ord = (void *) node->runtime_data; - rdma_device_t *rd = pool_elt_at_index (rm->devices, ord->dev_instance); - u32 thread_index = vm->thread_index; - rdma_txq_t *txq = - vec_elt_at_index (rd->txqs, thread_index % vec_len (rd->txqs)); - u32 *from, *f, n_left_from; - u32 n_tx_packets, n_tx_failed; vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; struct ibv_send_wr wr[VLIB_FRAME_SIZE], *w = wr; struct ibv_sge sge[VLIB_FRAME_SIZE], *s = sge; - int i, ret; + u32 n, slot = txq->tail & (txq->size - 1); + u32 *tx = &txq->bufs[slot]; - f = from = vlib_frame_vector_args (frame); - n_left_from = frame->n_vectors; - vlib_get_buffers (vm, from, bufs, n_left_from); + /* do not enqueue more packet than ring space */ + n_left_from = clib_min (n_left_from, txq->size - (txq->tail - txq->head)); + /* avoid wrap-around logic in core loop */ + n = n_left_from = clib_min (n_left_from, txq->size - slot); + /* if ring is full, do nothing */ + if (PREDICT_FALSE (0 == n_left_from)) + return 0; + + vlib_get_buffers (vm, bi, bufs, n_left_from); memset (w, 0, n_left_from * sizeof (w[0])); - while (n_left_from >= 4) + while (n >= 4) { - if (PREDICT_TRUE (n_left_from >= 8)) + if (PREDICT_TRUE (n >= 8)) { vlib_prefetch_buffer_header (b[4 + 0], LOAD); vlib_prefetch_buffer_header (b[4 + 1], LOAD); @@ -82,96 +81,126 @@ VNET_DEVICE_CLASS_TX_FN (rdma_device_class) (vlib_main_t * vm, CLIB_PREFETCH (&w[4 + 3], CLIB_CACHE_LINE_BYTES, STORE); } + vlib_buffer_copy_indices (tx, bi, 4); + s[0].addr = vlib_buffer_get_current_va (b[0]); s[0].length = b[0]->current_length; - s[0].lkey = rd->mr->lkey; + s[0].lkey = rd->lkey; s[1].addr = vlib_buffer_get_current_va (b[1]); s[1].length = b[1]->current_length; - s[1].lkey = rd->mr->lkey; + s[1].lkey = rd->lkey; s[2].addr = vlib_buffer_get_current_va (b[2]); s[2].length = b[2]->current_length; - s[2].lkey = rd->mr->lkey; + s[2].lkey = rd->lkey; s[3].addr = vlib_buffer_get_current_va (b[3]); s[3].length = b[3]->current_length; - s[3].lkey = rd->mr->lkey; + s[3].lkey = rd->lkey; - w[0].wr_id = f[0]; w[0].next = &w[0] + 1; w[0].sg_list = &s[0]; w[0].num_sge = 1; w[0].opcode = IBV_WR_SEND; - w[1].wr_id = f[1]; w[1].next = &w[1] + 1; w[1].sg_list = &s[1]; w[1].num_sge = 1; w[1].opcode = IBV_WR_SEND; - w[2].wr_id = f[2]; w[2].next = &w[2] + 1; w[2].sg_list = &s[2]; w[2].num_sge = 1; w[2].opcode = IBV_WR_SEND; - w[3].wr_id = f[3]; w[3].next = &w[3] + 1; w[3].sg_list = &s[3]; w[3].num_sge = 1; w[3].opcode = IBV_WR_SEND; s += 4; - f += 4; w += 4; b += 4; - n_left_from -= 4; + bi += 4; + tx += 4; + n -= 4; } - while (n_left_from >= 1) + while (n >= 1) { + vlib_buffer_copy_indices (tx, bi, 1); + s[0].addr = vlib_buffer_get_current_va (b[0]); s[0].length = b[0]->current_length; - s[0].lkey = rd->mr->lkey; + s[0].lkey = rd->lkey; - w[0].wr_id = f[0]; w[0].next = &w[0] + 1; w[0].sg_list = &s[0]; w[0].num_sge = 1; w[0].opcode = IBV_WR_SEND; s += 1; - f += 1; w += 1; b += 1; - n_left_from -= 1; + bi += 1; + tx += 1; + n -= 1; } - w[-1].next = 0; /* fix next pointer in WR linked-list last item */ + w[-1].wr_id = txq->tail + n_left_from; /* register item to free */ + w[-1].next = 0; /* fix next pointer in WR linked-list */ + w[-1].send_flags = IBV_SEND_SIGNALED; /* generate a CQE so we can free buffers */ w = wr; + if (PREDICT_FALSE (0 != ibv_post_send (txq->qp, w, &w))) + n_left_from = w - wr; + + txq->tail += n_left_from; + return n_left_from; +} + +VNET_DEVICE_CLASS_TX_FN (rdma_device_class) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + rdma_main_t *rm = &rdma_main; + vnet_interface_output_runtime_t *ord = (void *) node->runtime_data; + rdma_device_t *rd = pool_elt_at_index (rm->devices, ord->dev_instance); + u32 thread_index = vm->thread_index; + rdma_txq_t *txq = + vec_elt_at_index (rd->txqs, thread_index % vec_len (rd->txqs)); + u32 *from; + u32 n_left_from; + int i; + + ASSERT (txq->size >= VLIB_FRAME_SIZE && is_pow2 (txq->size)); + ASSERT (txq->tail - txq->head <= txq->size); + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + clib_spinlock_lock_if_init (&txq->lock); - for (i = 0; i < 5; i++) + + for (i = 0; i < 5 && n_left_from >= 0; i++) { + u32 n_enq; rdma_device_output_free (vm, txq); - ret = ibv_post_send (txq->qp, w, &w); - if (0 == ret) - break; + n_enq = rmda_device_output_tx (vm, rd, txq, n_left_from, from); + n_left_from -= n_enq; + from += n_enq; } - clib_spinlock_unlock_if_init (&txq->lock); - n_tx_packets = 0 == ret ? frame->n_vectors : w - wr; - n_tx_failed = frame->n_vectors - n_tx_packets; + clib_spinlock_unlock_if_init (&txq->lock); - if (PREDICT_FALSE (n_tx_failed)) + if (PREDICT_FALSE (n_left_from)) { - vlib_buffer_free (vm, &from[n_tx_packets], n_tx_failed); + vlib_buffer_free (vm, from, n_left_from); vlib_error_count (vm, node->node_index, - RDMA_TX_ERROR_NO_FREE_SLOTS, n_tx_failed); + RDMA_TX_ERROR_NO_FREE_SLOTS, n_left_from); } - return n_tx_packets; + return frame->n_vectors - n_left_from; } /* diff --git a/src/plugins/rdma/rdma.h b/src/plugins/rdma/rdma.h index c7df6f72fdf..0aae4985276 100644 --- a/src/plugins/rdma/rdma.h +++ b/src/plugins/rdma/rdma.h @@ -37,40 +37,47 @@ enum typedef struct { CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); - u32 size; - u32 n_enq; struct ibv_cq *cq; struct ibv_wq *wq; + u32 *bufs; + u32 size; + u32 head; + u32 tail; } rdma_rxq_t; typedef struct { CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); - u32 size; - u32 n_enq; + clib_spinlock_t lock; struct ibv_cq *cq; struct ibv_qp *qp; - clib_spinlock_t lock; + u32 *bufs; + u32 size; + u32 head; + u32 tail; } rdma_txq_t; typedef struct { CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); + + /* following fields are accessed in datapath */ + rdma_rxq_t *rxqs; + rdma_txq_t *txqs; u32 flags; u32 per_interface_next_index; - - u32 dev_instance; u32 sw_if_index; u32 hw_if_index; + u32 lkey; /* cache of mr->lkey */ + u8 pool; /* buffer pool index */ - u32 async_event_clib_file_index; - - rdma_rxq_t *rxqs; - rdma_txq_t *txqs; - + /* fields below are not accessed in datapath */ + vlib_pci_device_info_t *pci; u8 *name; + u8 *linux_ifname; mac_address_t hwaddr; - vlib_pci_addr_t pci_addr; + u32 async_event_clib_file_index; + u32 dev_instance; struct ibv_context *ctx; struct ibv_pd *pd; @@ -80,7 +87,6 @@ typedef struct struct ibv_flow *flow_ucast; struct ibv_flow *flow_mcast; - /* error */ clib_error_t *error; } rdma_device_t; |