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4ebcd95e620a2be1c69cce3297f31754d9aa8c88
vpp/src/plugins/rdma/input.c
Jieqiang Wang 4ebcd95e62 rdma: two small improvements for rdma interface 
- fix branch prediction for checking rdma ERROR flag
- add the missing right angle bracket to help message

Type: improvement
Signed-off-by: Jieqiang Wang <jieqiang.wang@arm.com>
Reviewed-by: Lijian Zhang <lijian.zhang@arm.com>
Reviewed-by: Tianyu Li <tianyu.li@arm.com>
Change-Id: I2ce667631b3e3f60939069e2a16ddba0ff12a695
2022-05-05 07:04:01 +00:00

1066 lines
31 KiB
C
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/*
*------------------------------------------------------------------
* 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 <vnet/interface/rx_queue_funcs.h>
#include <rdma/rdma.h>
#define foreach_rdma_input_error \
_(BUFFER_ALLOC, "buffer alloc error")
typedef enum
{
#define _(f,s) RDMA_INPUT_ERROR_##f,
foreach_rdma_input_error
#undef _
RDMA_INPUT_N_ERROR,
} rdma_input_error_t;
static __clib_unused char *rdma_input_error_strings[] = {
#define _(n,s) s,
foreach_rdma_input_error
#undef _
};
static_always_inline void
ibv_set_recv_wr_and_sge (struct ibv_recv_wr *w, struct ibv_sge *s, u64 va,
u32 data_size, u32 lkey)
{
s[0].addr = va;
s[0].length = data_size;
s[0].lkey = lkey;
w[0].next = w + 1;
w[0].sg_list = s;
w[0].num_sge = 1;
}
static_always_inline u32
rdma_device_legacy_input_refill_additional (vlib_main_t * vm,
rdma_device_t * rd,
rdma_rxq_t * rxq,
rdma_per_thread_data_t * ptd,
vlib_buffer_t * bt,
u32 first_slot, u32 n_alloc)
{
int i;
u8 log_wqe_sz = rxq->log_wqe_sz;
u32 *bi = ptd->tmp_bi;
vlib_buffer_t **bufs = ptd->tmp_bufs;
for (i = 0; i < n_alloc; i++)
{
u8 chain_sz = rxq->n_used_per_chain[first_slot + i];
u8 chain_sz_alloc;
mlx5dv_wqe_ds_t *current_wqe =
rxq->wqes + ((first_slot + i) << log_wqe_sz);
if (chain_sz == 0)
continue;
if (PREDICT_FALSE ((chain_sz_alloc =
vlib_buffer_alloc_from_pool (vm, bi, chain_sz,
rd->pool)) !=
chain_sz))
{
vlib_buffer_free (vm, bi, chain_sz_alloc);
break;
}
/*Build the chain */
vlib_get_buffers (vm, bi, bufs, chain_sz);
for (int j = 0; j < chain_sz - 1; j++)
{
vlib_buffer_copy_template (bufs[j], bt);
bufs[j]->next_buffer = bi[j + 1];
bufs[j]->flags |= VLIB_BUFFER_NEXT_PRESENT;
}
/* The chain starting at the second buffer is pre-initialised */
vlib_buffer_copy_template (bufs[chain_sz - 1], bt);
/* Stick with the already existing chain */
if (chain_sz < rxq->n_ds_per_wqe - 1)
{
bufs[chain_sz - 1]->next_buffer = rxq->second_bufs[first_slot + i];
bufs[chain_sz - 1]->flags |= VLIB_BUFFER_NEXT_PRESENT;
}
else
{
bufs[chain_sz - 1]->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
}
/* Update the wqes */
for (int j = 0; j < chain_sz; j++)
{
u64 addr;
vlib_get_buffers_with_offset (vm, bi + j,
(void *) &addr, 1,
sizeof (vlib_buffer_t));
current_wqe[j + 1].addr = clib_host_to_net_u64 (addr);
}
rxq->n_used_per_chain[first_slot + i] = 0;
rxq->n_total_additional_segs -= chain_sz;
rxq->second_bufs[first_slot + i] = bi[0];
}
return i;
}
static_always_inline void
rdma_device_input_refill (vlib_main_t * vm, rdma_device_t * rd,
rdma_rxq_t * rxq, vlib_buffer_t * bt,
const int is_mlx5dv, const int is_striding)
{
u32 n_alloc, n;
u16 ring_space;
struct ibv_recv_wr wr[VLIB_FRAME_SIZE], *w = wr;
struct ibv_sge sge[VLIB_FRAME_SIZE], *s = sge;
rdma_per_thread_data_t *ptd =
&rdma_main.per_thread_data[vlib_get_thread_index ()];
u32 mask = rxq->size - 1;
u32 slot = rxq->tail & mask;
u32 *bufs = rxq->bufs + slot;
u32 data_size = rxq->buf_sz;
u32 lkey = rd->lkey;
const int log_stride_per_wqe = is_striding ? rxq->log_stride_per_wqe : 0;
const int log_wqe_sz = rxq->log_wqe_sz;
/*In legacy mode, maybe some buffers chains are incomplete? */
if (PREDICT_FALSE
(is_mlx5dv && !is_striding && (rxq->incomplete_tail != rxq->tail)))
{
int n_incomplete = rxq->incomplete_tail - rxq->tail;
int n_completed =
rdma_device_legacy_input_refill_additional (vm, rd, rxq, ptd, bt,
slot,
n_incomplete);
rxq->tail += n_completed;
slot = rxq->tail & mask;
/* Don't start recycling head buffers if there are incomplete chains */
if (n_completed != n_incomplete)
return;
}
/* refilled buffers must be a multiple of 8 and of strides per WQE */
u32 alloc_multiple = 1 << (clib_max (3, log_stride_per_wqe));
ring_space = rxq->size - (rxq->tail - rxq->head);
n_alloc = clib_min (VLIB_FRAME_SIZE, ring_space);
/* do not bother to allocate if too small */
if (n_alloc < 2 * alloc_multiple)
return;
/* avoid wrap-around logic in core loop */
n_alloc = clib_min (n_alloc, rxq->size - slot);
n_alloc &= ~(alloc_multiple - 1); /* round to alloc_multiple */
n = vlib_buffer_alloc_to_ring_from_pool (vm, rxq->bufs, slot, rxq->size,
n_alloc, rd->pool);
if (PREDICT_FALSE (n != n_alloc))
{
u32 n_free;
if (n < alloc_multiple)
{
if (n)
vlib_buffer_free_from_ring (vm, rxq->bufs, slot, rxq->size, n);
return;
}
/* partial allocation, round and return rest */
n_free = n & (alloc_multiple - 1);
n -= n_free;
if (n_free)
vlib_buffer_free_from_ring (vm, rxq->bufs, (slot + n) & mask,
rxq->size, n_free);
}
n_alloc = n;
if (is_mlx5dv)
{
u64 __clib_aligned (32) va[8];
/* slot does not necessarily correspond to the slot
in the wqes ring (in 16B words) */
u32 wqes_slot = slot << (log_wqe_sz - log_stride_per_wqe);
const u32 wqe_cnt = rxq->wqe_cnt;
mlx5dv_wqe_ds_t *wqe = rxq->wqes + wqes_slot;
const int wqe_sz = 1 << log_wqe_sz;
const int stride_per_wqe = 1 << log_stride_per_wqe;
int current_data_seg = 0;
/* In legacy mode, this function only refills head descriptors for each
WQE, so RDMA_RXQ_MAX_CHAIN_SZ-1 data segments are skipped per WQE */
const int log_skip_wqe = is_striding ? 0 : log_wqe_sz;
while (n >= 1)
{
vlib_get_buffers_with_offset (vm, rxq->bufs + slot, (void **) va, 8,
sizeof (vlib_buffer_t));
#ifdef CLIB_HAVE_VEC256
*(u64x4 *) va = u64x4_byte_swap (*(u64x4 *) va);
*(u64x4 *) (va + 4) = u64x4_byte_swap (*(u64x4 *) (va + 4));
#else
for (int i = 0; i < 8; i++)
va[i] = clib_host_to_net_u64 (va[i]);
#endif
/*In striding RQ mode, the first 16B-word of the WQE is the SRQ header.
It is initialised as if it were a LINKED_LIST, as we have no guarantee
about what RDMA core does (CYCLIC_RQ or LINKED_LIST_RQ). In cyclic
mode, the SRQ header is ignored anyways... */
/* *INDENT-OFF* */
if (is_striding && !(current_data_seg & (wqe_sz - 1)))
*(mlx5dv_wqe_srq_next_t *) wqe = (mlx5dv_wqe_srq_next_t)
{
.rsvd0 = {0},
.next_wqe_index = clib_host_to_net_u16 (((wqes_slot >> log_wqe_sz) + 1) & (wqe_cnt - 1)),
.signature = 0,
.rsvd1 = {0}
};
/* *INDENT-ON* */
/* TODO: when log_skip_wqe > 2, hw_prefetcher doesn't work, lots of LLC store
misses occur for wqes, to be fixed... */
if (!is_striding || !(current_data_seg & ~(stride_per_wqe - 1)))
{
wqe[(0 << log_skip_wqe) + is_striding].addr = va[0];
wqe[(1 << log_skip_wqe) + is_striding].addr = va[1];
wqe[(2 << log_skip_wqe) + is_striding].addr = va[2];
wqe[(3 << log_skip_wqe) + is_striding].addr = va[3];
wqe[(4 << log_skip_wqe) + is_striding].addr = va[4];
wqe[(5 << log_skip_wqe) + is_striding].addr = va[5];
wqe[(6 << log_skip_wqe) + is_striding].addr = va[6];
wqe[(7 << log_skip_wqe) + is_striding].addr = va[7];
slot += 8;
n -= 8;
}
wqe += 8 << log_skip_wqe;
wqes_slot += 8 << log_skip_wqe;
current_data_seg += 8;
current_data_seg &= wqe_sz - 1;
}
/* In legacy mode, there is some work required to finish building the SG lists */
if (!is_striding)
{
int first_slot = slot - n_alloc;
rxq->incomplete_tail += n_alloc;
if (PREDICT_FALSE (rxq->n_total_additional_segs))
n_alloc =
rdma_device_legacy_input_refill_additional (vm, rd, rxq, ptd,
bt, first_slot,
n_alloc);
}
CLIB_MEMORY_STORE_BARRIER ();
rxq->tail += n_alloc;
if (is_striding)
{
rxq->striding_wqe_tail += n_alloc >> log_stride_per_wqe;
rxq->wq_db[MLX5_RCV_DBR] =
clib_host_to_net_u32 (rxq->striding_wqe_tail);
}
else
rxq->wq_db[MLX5_RCV_DBR] = clib_host_to_net_u32 (rxq->tail);
return;
}
while (n >= 8)
{
u64 va[8];
if (PREDICT_TRUE (n >= 16))
{
clib_prefetch_store (s + 16);
clib_prefetch_store (w + 16);
}
vlib_get_buffers_with_offset (vm, bufs, (void **) va, 8,
sizeof (vlib_buffer_t));
ibv_set_recv_wr_and_sge (w++, s++, va[0], data_size, lkey);
ibv_set_recv_wr_and_sge (w++, s++, va[1], data_size, lkey);
ibv_set_recv_wr_and_sge (w++, s++, va[2], data_size, lkey);
ibv_set_recv_wr_and_sge (w++, s++, va[3], data_size, lkey);
ibv_set_recv_wr_and_sge (w++, s++, va[4], data_size, lkey);
ibv_set_recv_wr_and_sge (w++, s++, va[5], data_size, lkey);
ibv_set_recv_wr_and_sge (w++, s++, va[6], data_size, lkey);
ibv_set_recv_wr_and_sge (w++, s++, va[7], data_size, lkey);
bufs += 8;
n -= 8;
}
w[-1].next = 0; /* fix next pointer in WR linked-list last item */
n = n_alloc;
if (ibv_post_wq_recv (rxq->wq, wr, &w) != 0)
{
n = w - wr;
vlib_buffer_free_from_ring (vm, rxq->bufs, slot + n, rxq->size,
n_alloc - n);
}
rxq->tail += n;
}
static_always_inline void
rdma_device_input_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
const rdma_device_t * rd, u32 n_left,
const u32 * bi, u32 next_index, u16 * cqe_flags,
int is_mlx5dv)
{
u32 n_trace = vlib_get_trace_count (vm, node);
if (PREDICT_TRUE (0 == n_trace))
return;
while (n_trace && n_left)
{
vlib_buffer_t *b = vlib_get_buffer (vm, bi[0]);
if (PREDICT_TRUE
(vlib_trace_buffer (vm, node, next_index, b, /* follow_chain */ 0)))
{
rdma_input_trace_t *tr = vlib_add_trace (vm, node, b, sizeof (*tr));
tr->next_index = next_index;
tr->hw_if_index = rd->hw_if_index;
tr->cqe_flags = is_mlx5dv ? clib_net_to_host_u16 (cqe_flags[0]) : 0;
n_trace--;
}
/* next */
n_left--;
cqe_flags++;
bi++;
}
vlib_set_trace_count (vm, node, n_trace);
}
static_always_inline void
rdma_device_input_ethernet (vlib_main_t * vm, vlib_node_runtime_t * node,
const rdma_device_t * rd, u32 next_index,
int skip_ip4_cksum)
{
vlib_next_frame_t *nf;
vlib_frame_t *f;
ethernet_input_frame_t *ef;
if (PREDICT_FALSE (VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT != next_index))
return;
nf =
vlib_node_runtime_get_next_frame (vm, node,
VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT);
f = vlib_get_frame (vm, nf->frame);
f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX;
if (skip_ip4_cksum)
f->flags |= ETH_INPUT_FRAME_F_IP4_CKSUM_OK;
ef = vlib_frame_scalar_args (f);
ef->sw_if_index = rd->sw_if_index;
ef->hw_if_index = rd->hw_if_index;
}
static_always_inline u32
rdma_device_input_bufs (vlib_main_t * vm, const rdma_device_t * rd,
vlib_buffer_t ** b, struct ibv_wc *wc,
u32 n_left_from, vlib_buffer_t * bt)
{
u32 n_rx_bytes = 0;
while (n_left_from >= 4)
{
if (PREDICT_TRUE (n_left_from >= 8))
{
clib_prefetch_load (&wc[4 + 0]);
clib_prefetch_load (&wc[4 + 1]);
clib_prefetch_load (&wc[4 + 2]);
clib_prefetch_load (&wc[4 + 3]);
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);
}
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);
n_rx_bytes += b[0]->current_length = wc[0].byte_len;
n_rx_bytes += b[1]->current_length = wc[1].byte_len;
n_rx_bytes += b[2]->current_length = wc[2].byte_len;
n_rx_bytes += b[3]->current_length = wc[3].byte_len;
b += 4;
wc += 4;
n_left_from -= 4;
}
while (n_left_from >= 1)
{
vlib_buffer_copy_template (b[0], bt);
n_rx_bytes += b[0]->current_length = wc[0].byte_len;
b += 1;
wc += 1;
n_left_from -= 1;
}
return n_rx_bytes;
}
static_always_inline void
process_mini_cqes (rdma_rxq_t * rxq, u32 skip, u32 n_left, u32 cq_ci,
u32 mask, u32 * byte_cnt)
{
mlx5dv_mini_cqe_t *mcqe;
u32 mcqe_array_index = (cq_ci + 1) & mask;
mcqe = (mlx5dv_mini_cqe_t *) (rxq->cqes + mcqe_array_index);
mcqe_array_index = cq_ci;
if (skip)
{
u32 n = skip & ~7;
if (n)
{
mcqe_array_index = (mcqe_array_index + n) & mask;
mcqe = (mlx5dv_mini_cqe_t *) (rxq->cqes + mcqe_array_index);
skip -= n;
}
if (skip)
{
n = clib_min (8 - skip, n_left);
for (int i = 0; i < n; i++)
byte_cnt[i] = mcqe[skip + i].byte_count;
mcqe_array_index = (mcqe_array_index + 8) & mask;
mcqe = (mlx5dv_mini_cqe_t *) (rxq->cqes + mcqe_array_index);
n_left -= n;
byte_cnt += n;
}
}
while (n_left >= 8)
{
for (int i = 0; i < 8; i++)
byte_cnt[i] = mcqe[i].byte_count;
n_left -= 8;
byte_cnt += 8;
mcqe_array_index = (mcqe_array_index + 8) & mask;
mcqe = (mlx5dv_mini_cqe_t *) (rxq->cqes + mcqe_array_index);
}
if (n_left)
{
for (int i = 0; i < n_left; i++)
byte_cnt[i] = mcqe[i].byte_count;
}
}
static_always_inline void
cqe_set_owner (mlx5dv_cqe_t * cqe, u32 n_left, u8 owner)
{
while (n_left >= 8)
{
cqe[0].opcode_cqefmt_se_owner = owner;
cqe[1].opcode_cqefmt_se_owner = owner;
cqe[2].opcode_cqefmt_se_owner = owner;
cqe[3].opcode_cqefmt_se_owner = owner;
cqe[4].opcode_cqefmt_se_owner = owner;
cqe[5].opcode_cqefmt_se_owner = owner;
cqe[6].opcode_cqefmt_se_owner = owner;
cqe[7].opcode_cqefmt_se_owner = owner;
n_left -= 8;
cqe += 8;
}
while (n_left)
{
cqe[0].opcode_cqefmt_se_owner = owner;
n_left--;
cqe++;
}
}
static_always_inline void
compressed_cqe_reset_owner (rdma_rxq_t * rxq, u32 n_mini_cqes, u32 cq_ci,
u32 mask, u32 log2_cq_size)
{
u8 owner;
u32 offset, cq_size = 1 << log2_cq_size;
/* first CQE is reset by hardware */
cq_ci++;
n_mini_cqes--;
offset = cq_ci & mask;
owner = 0xf0 | ((cq_ci >> log2_cq_size) & 1);
if (offset + n_mini_cqes < cq_size)
{
cqe_set_owner (rxq->cqes + offset, n_mini_cqes, owner);
}
else
{
u32 n = cq_size - offset;
cqe_set_owner (rxq->cqes + offset, n, owner);
cqe_set_owner (rxq->cqes, n_mini_cqes - n, owner ^ 1);
}
}
static_always_inline uword
rdma_device_poll_cq_mlx5dv (rdma_device_t * rd, rdma_rxq_t * rxq,
u32 * byte_cnt, u16 * cqe_flags)
{
u32 n_rx_packets = 0;
u32 log2_cq_size = rxq->log2_cq_size;
u32 mask = pow2_mask (log2_cq_size);
u32 cq_ci = rxq->cq_ci;
if (rxq->n_mini_cqes_left)
{
/* partially processed mini-cqe array */
u32 n_mini_cqes = rxq->n_mini_cqes;
u32 n_mini_cqes_left = rxq->n_mini_cqes_left;
process_mini_cqes (rxq, n_mini_cqes - n_mini_cqes_left,
n_mini_cqes_left, cq_ci, mask, byte_cnt);
compressed_cqe_reset_owner (rxq, n_mini_cqes, cq_ci, mask,
log2_cq_size);
clib_memset_u16 (cqe_flags, rxq->last_cqe_flags, n_mini_cqes_left);
n_rx_packets = n_mini_cqes_left;
byte_cnt += n_mini_cqes_left;
cqe_flags += n_mini_cqes_left;
rxq->n_mini_cqes_left = 0;
rxq->cq_ci = cq_ci = cq_ci + n_mini_cqes;
}
while (n_rx_packets < VLIB_FRAME_SIZE)
{
u8 cqe_last_byte, owner;
mlx5dv_cqe_t *cqe = rxq->cqes + (cq_ci & mask);
clib_prefetch_load (rxq->cqes + ((cq_ci + 8) & mask));
owner = (cq_ci >> log2_cq_size) & 1;
cqe_last_byte = cqe->opcode_cqefmt_se_owner;
if ((cqe_last_byte & 0x1) != owner)
break;
cqe_last_byte &= 0xfc; /* remove owner and solicited bits */
if (cqe_last_byte == 0x2c) /* OPCODE = 0x2 (Responder Send), Format = 0x3 (Compressed CQE) */
{
u32 n_mini_cqes = clib_net_to_host_u32 (cqe->mini_cqe_num);
u32 n_left = VLIB_FRAME_SIZE - n_rx_packets;
u16 flags = cqe->flags;
if (n_left >= n_mini_cqes)
{
process_mini_cqes (rxq, 0, n_mini_cqes, cq_ci, mask, byte_cnt);
clib_memset_u16 (cqe_flags, flags, n_mini_cqes);
compressed_cqe_reset_owner (rxq, n_mini_cqes, cq_ci, mask,
log2_cq_size);
n_rx_packets += n_mini_cqes;
byte_cnt += n_mini_cqes;
cqe_flags += n_mini_cqes;
cq_ci += n_mini_cqes;
}
else
{
process_mini_cqes (rxq, 0, n_left, cq_ci, mask, byte_cnt);
clib_memset_u16 (cqe_flags, flags, n_left);
n_rx_packets = VLIB_FRAME_SIZE;
rxq->n_mini_cqes = n_mini_cqes;
rxq->n_mini_cqes_left = n_mini_cqes - n_left;
rxq->last_cqe_flags = flags;
goto done;
}
continue;
}
if (cqe_last_byte == 0x20) /* OPCODE = 0x2 (Responder Send), Format = 0x0 (no inline data) */
{
byte_cnt[0] = cqe->byte_cnt;
cqe_flags[0] = cqe->flags;
n_rx_packets++;
cq_ci++;
byte_cnt++;
continue;
}
rd->flags |= RDMA_DEVICE_F_ERROR;
break;
}
done:
if (n_rx_packets)
rxq->cq_db[0] = rxq->cq_ci = cq_ci;
return n_rx_packets;
}
static_always_inline int
rdma_device_mlx5dv_striding_rq_parse_bc (int n_rx_packets, int *n_rx_segs,
u32 * bc)
{
/* Determine if slow path is needed */
int filler = 0;
for (int i = 0; i < n_rx_packets; i++)
{
*n_rx_segs +=
(bc[i] & CQE_BC_CONSUMED_STRIDES_MASK) >>
CQE_BC_CONSUMED_STRIDES_SHIFT;
filler |= ! !(bc[i] & CQE_BC_FILLER_MASK);
}
return n_rx_packets != *n_rx_segs || filler;
}
static_always_inline int
rdma_device_mlx5dv_legacy_rq_slow_path_needed (u32 buf_sz, int n_rx_packets,
u32 * bc)
{
#if defined CLIB_HAVE_VEC256
u32x8 thresh8 = u32x8_splat (buf_sz);
for (int i = 0; i < n_rx_packets; i += 8)
if (!u32x8_is_all_zero (*(u32x8 *) (bc + i) > thresh8))
return 1;
#elif defined CLIB_HAVE_VEC128
u32x4 thresh4 = u32x4_splat (buf_sz);
for (int i = 0; i < n_rx_packets; i += 4)
if (!u32x4_is_all_zero (*(u32x4 *) (bc + i) > thresh4))
return 1;
#else
while (n_rx_packets)
{
if (*bc > buf_sz)
return 1;
bc++;
n_rx_packets--;
}
#endif
return 0;
}
static_always_inline int
rdma_device_mlx5dv_l3_validate_and_swap_bc (rdma_per_thread_data_t
* ptd, int n_rx_packets, u32 * bc)
{
u16 mask = CQE_FLAG_L3_HDR_TYPE_MASK | CQE_FLAG_L3_OK;
u16 match = CQE_FLAG_L3_HDR_TYPE_IP4 << CQE_FLAG_L3_HDR_TYPE_SHIFT;
/* verify that all ip4 packets have l3_ok flag set and convert packet
length from network to host byte order */
int skip_ip4_cksum = 1;
#if defined CLIB_HAVE_VEC256
u16x16 mask16 = u16x16_splat (mask);
u16x16 match16 = u16x16_splat (match);
u16x16 r = { };
for (int i = 0; i * 16 < n_rx_packets; i++)
r |= (ptd->cqe_flags16[i] & mask16) != match16;
if (!u16x16_is_all_zero (r))
skip_ip4_cksum = 0;
for (int i = 0; i < n_rx_packets; i += 8)
*(u32x8 *) (bc + i) = u32x8_byte_swap (*(u32x8 *) (bc + i));
#elif defined CLIB_HAVE_VEC128
u16x8 mask8 = u16x8_splat (mask);
u16x8 match8 = u16x8_splat (match);
u16x8 r = { };
for (int i = 0; i * 8 < n_rx_packets; i++)
r |= (ptd->cqe_flags8[i] & mask8) != match8;
if (!u16x8_is_all_zero (r))
skip_ip4_cksum = 0;
for (int i = 0; i < n_rx_packets; i += 4)
*(u32x4 *) (bc + i) = u32x4_byte_swap (*(u32x4 *) (bc + i));
#else
for (int i = 0; i < n_rx_packets; i++)
if ((ptd->cqe_flags[i] & mask) != match)
skip_ip4_cksum = 0;
for (int i = 0; i < n_rx_packets; i++)
bc[i] = clib_net_to_host_u32 (bc[i]);
#endif
return skip_ip4_cksum;
}
static_always_inline u32
rdma_device_mlx5dv_fast_input (vlib_main_t * vm, rdma_rxq_t * rxq,
vlib_buffer_t ** bufs,
u32 qs_mask, vlib_buffer_t * bt,
u32 * to_next, u32 n_rx_segs, u32 * bc,
u32 bc_mask)
{
vlib_buffer_t **b = bufs;
u32 n_left = n_rx_segs;
u32 n_rx_bytes = 0;
vlib_buffer_copy_indices_from_ring (to_next, rxq->bufs,
rxq->head & qs_mask, rxq->size,
n_rx_segs);
rxq->head += n_rx_segs;
vlib_get_buffers (vm, to_next, bufs, n_rx_segs);
while (n_left >= 8)
{
clib_prefetch_store (b[4]);
vlib_buffer_copy_template (b[0], bt);
n_rx_bytes += b[0]->current_length = bc[0] & bc_mask;
clib_prefetch_store (b[5]);
vlib_buffer_copy_template (b[1], bt);
n_rx_bytes += b[1]->current_length = bc[1] & bc_mask;
clib_prefetch_store (b[6]);
vlib_buffer_copy_template (b[2], bt);
n_rx_bytes += b[2]->current_length = bc[2] & bc_mask;
clib_prefetch_store (b[7]);
vlib_buffer_copy_template (b[3], bt);
n_rx_bytes += b[3]->current_length = bc[3] & bc_mask;
/* next */
bc += 4;
b += 4;
n_left -= 4;
}
while (n_left)
{
vlib_buffer_copy_template (b[0], bt);
n_rx_bytes += b[0]->current_length = bc[0] & bc_mask;
/* next */
bc++;
b++;
n_left--;
}
return n_rx_bytes;
}
static_always_inline void
rdma_device_mlx5dv_legacy_rq_fix_chains (vlib_main_t * vm, rdma_rxq_t * rxq,
vlib_buffer_t ** bufs, u32 qs_mask,
u32 n)
{
u32 buf_sz = rxq->buf_sz;
uword slot = (rxq->head - n) & qs_mask;
u32 *second = &rxq->second_bufs[slot];
u32 n_wrap_around = (slot + n) & (qs_mask + 1) ? (slot + n) & qs_mask : 0;
u8 *n_used_per_chain = &rxq->n_used_per_chain[slot];
n -= n_wrap_around;
wrap_around:
while (n > 0)
{
u16 total_length = bufs[0]->current_length;
if (total_length > buf_sz)
{
vlib_buffer_t *current_buf = bufs[0];
u8 current_chain_sz = 0;
current_buf->current_length = buf_sz;
total_length -= buf_sz;
current_buf->total_length_not_including_first_buffer = total_length;
current_buf->flags |= VLIB_BUFFER_NEXT_PRESENT;
current_buf->next_buffer = second[0];
do
{
current_buf = vlib_get_buffer (vm, current_buf->next_buffer);
current_buf->current_length = clib_min (buf_sz, total_length);
total_length -= current_buf->current_length;
current_chain_sz++;
}
while (total_length > 0);
current_buf->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
second[0] = current_buf->next_buffer;
current_buf->next_buffer = 0;
rxq->n_total_additional_segs += current_chain_sz;
n_used_per_chain[0] = current_chain_sz;
}
bufs++;
second++;
n_used_per_chain++;
n--;
}
if (PREDICT_FALSE (n_wrap_around))
{
n = n_wrap_around;
n_wrap_around = 0;
second = rxq->second_bufs;
n_used_per_chain = rxq->n_used_per_chain;
goto wrap_around;
}
}
static_always_inline u32
rdma_device_mlx5dv_striding_rq_input (vlib_main_t * vm,
rdma_per_thread_data_t * ptd,
rdma_rxq_t * rxq,
vlib_buffer_t * bt, u32 * to_next,
int n_rx_segs, int *n_rx_packets,
u32 * bc, int slow_path_needed)
{
u32 mask = rxq->size - 1;
u32 n_rx_bytes = 0;
if (PREDICT_TRUE (!slow_path_needed))
{
vlib_buffer_t *bufs[VLIB_FRAME_SIZE];
n_rx_bytes +=
rdma_device_mlx5dv_fast_input (vm, rxq, bufs, mask, bt, to_next,
n_rx_segs, bc, CQE_BC_BYTE_COUNT_MASK);
}
else /* Slow path with multiseg */
{
vlib_buffer_t *pkt_head; /*Current head buffer */
vlib_buffer_t *pkt_prev; /* Buffer processed at the previous iteration */
u32 pkt_head_idx;
vlib_buffer_t **pkt;
uword n_segs_remaining = 0; /*Remaining strides in current buffer */
u32 n_bytes_remaining = 0; /*Remaining bytes in current buffer */
u32 *next_in_frame = to_next;
u32 *next_to_free = ptd->to_free_buffers;
bt->current_length = vlib_buffer_get_default_data_size (vm);
do
{
vlib_buffer_t *bufs[VLIB_FRAME_SIZE];
u32 n_left = clib_min (n_rx_segs, VLIB_FRAME_SIZE);
n_rx_segs -= n_left;
vlib_buffer_copy_indices_from_ring (ptd->current_segs,
rxq->bufs, rxq->head & mask,
rxq->size, n_left);
rxq->head += n_left;
vlib_get_buffers (vm, ptd->current_segs, bufs, n_left);
pkt = bufs;
while (n_left > 0)
{
/* Initialize the current buffer as full size */
vlib_buffer_copy_template (pkt[0], bt);
if (!n_segs_remaining) /* No pending chain */
{
n_segs_remaining =
(bc[0] & CQE_BC_CONSUMED_STRIDES_MASK) >>
CQE_BC_CONSUMED_STRIDES_SHIFT;
pkt_head = pkt[0];
pkt_head_idx = ptd->current_segs[pkt - bufs];
n_bytes_remaining = bc[0] & CQE_BC_BYTE_COUNT_MASK;
pkt_head->total_length_not_including_first_buffer =
n_segs_remaining >
1 ? n_bytes_remaining - pkt[0]->current_length : 0;
}
else /* Perform chaining if it's a continuation buffer */
{
pkt_prev->next_buffer = ptd->current_segs[pkt - bufs];
pkt_prev->flags |= VLIB_BUFFER_NEXT_PRESENT;
pkt[0]->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
}
if (n_segs_remaining == 1) /* Last buffer of the chain */
{
pkt[0]->current_length = n_bytes_remaining;
if (bc[0] & CQE_BC_FILLER_MASK)
{
(next_to_free++)[0] = pkt_head_idx;
(*n_rx_packets)--;
}
else
{
(next_in_frame++)[0] = pkt_head_idx;
n_rx_bytes +=
pkt_head->current_length +
pkt_head->total_length_not_including_first_buffer;
}
/*Go to next CQE */
bc++;
}
else
{
n_bytes_remaining -= pkt[0]->current_length;
pkt_prev = pkt[0];
}
n_segs_remaining--;
n_left--;
pkt++;
}
}
while (n_rx_segs > 0);
vlib_buffer_free (vm, ptd->to_free_buffers,
next_to_free - ptd->to_free_buffers);
}
return n_rx_bytes;
}
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, const int use_mlx5dv)
{
rdma_main_t *rm = &rdma_main;
vnet_main_t *vnm = vnet_get_main ();
rdma_per_thread_data_t *ptd = vec_elt_at_index (rm->per_thread_data,
vm->thread_index);
rdma_rxq_t *rxq = vec_elt_at_index (rd->rxqs, qid);
struct ibv_wc wc[VLIB_FRAME_SIZE];
u32 __clib_aligned (32) byte_cnts[VLIB_FRAME_SIZE];
vlib_buffer_t bt;
u32 next_index, *to_next, n_left_to_next, n_rx_bytes = 0;
int n_rx_packets, skip_ip4_cksum = 0;
u32 mask = rxq->size - 1;
const int is_striding = ! !(rd->flags & RDMA_DEVICE_F_STRIDING_RQ);
if (use_mlx5dv)
n_rx_packets = rdma_device_poll_cq_mlx5dv (rd, rxq, byte_cnts,
ptd->cqe_flags);
else
n_rx_packets = ibv_poll_cq (rxq->cq, VLIB_FRAME_SIZE, wc);
/* init buffer template */
vlib_buffer_copy_template (&bt, &ptd->buffer_template);
vnet_buffer (&bt)->sw_if_index[VLIB_RX] = rd->sw_if_index;
bt.buffer_pool_index = rd->pool;
if (PREDICT_FALSE (n_rx_packets <= 0))
goto refill;
/* 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);
if (use_mlx5dv)
{
u32 *bc = byte_cnts;
int slow_path_needed;
skip_ip4_cksum =
rdma_device_mlx5dv_l3_validate_and_swap_bc (ptd, n_rx_packets, bc);
if (is_striding)
{
int n_rx_segs = 0;
slow_path_needed =
rdma_device_mlx5dv_striding_rq_parse_bc (n_rx_packets,
&n_rx_segs, bc);
n_rx_bytes =
rdma_device_mlx5dv_striding_rq_input (vm, ptd, rxq, &bt,
to_next, n_rx_segs,
&n_rx_packets, bc,
slow_path_needed);
}
else
{
vlib_buffer_t *bufs[VLIB_FRAME_SIZE];
slow_path_needed =
rdma_device_mlx5dv_legacy_rq_slow_path_needed (rxq->buf_sz,
n_rx_packets, bc);
n_rx_bytes = rdma_device_mlx5dv_fast_input (
vm, rxq, bufs, mask, &bt, to_next, n_rx_packets, bc, ~0);
/* If there are chained buffers, some of the head buffers have a current length
higher than buf_sz: it needs to be fixed */
if (PREDICT_FALSE (slow_path_needed))
rdma_device_mlx5dv_legacy_rq_fix_chains (vm, rxq, bufs, mask,
n_rx_packets);
}
}
else
{
vlib_buffer_t *bufs[VLIB_FRAME_SIZE];
vlib_buffer_copy_indices_from_ring (to_next, rxq->bufs,
rxq->head & mask,
rxq->size, n_rx_packets);
vlib_get_buffers (vm, to_next, bufs, n_rx_packets);
rxq->head += n_rx_packets;
n_rx_bytes =
rdma_device_input_bufs (vm, rd, bufs, wc, n_rx_packets, &bt);
}
rdma_device_input_ethernet (vm, node, rd, next_index, skip_ip4_cksum);
vlib_put_next_frame (vm, node, next_index, n_left_to_next - n_rx_packets);
rdma_device_input_trace (vm, node, rd, n_rx_packets, to_next,
next_index, ptd->cqe_flags, use_mlx5dv);
/* reset flags to zero for the next run */
if (use_mlx5dv)
clib_memset_u16 (ptd->cqe_flags, 0, VLIB_FRAME_SIZE);
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);
refill:
rdma_device_input_refill (vm, rd, rxq, &bt, use_mlx5dv, is_striding);
return n_rx_packets;
}
VLIB_NODE_FN (rdma_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 n_rx = 0;
rdma_main_t *rm = &rdma_main;
vnet_hw_if_rxq_poll_vector_t *pv;
pv = vnet_hw_if_get_rxq_poll_vector (vm, node);
for (int i = 0; i < vec_len (pv); i++)
{
rdma_device_t *rd;
rd = vec_elt_at_index (rm->devices, pv[i].dev_instance);
if (PREDICT_TRUE (rd->flags & RDMA_DEVICE_F_ADMIN_UP) == 0)
continue;
if (PREDICT_FALSE (rd->flags & RDMA_DEVICE_F_ERROR))
continue;
if (PREDICT_TRUE (rd->flags & RDMA_DEVICE_F_MLX5DV))
n_rx +=
rdma_device_input_inline (vm, node, frame, rd, pv[i].queue_id, 1);
else
n_rx +=
rdma_device_input_inline (vm, node, frame, rd, pv[i].queue_id, 0);
}
return n_rx;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (rdma_input_node) = {
.name = "rdma-input",
.flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
.sibling_of = "device-input",
.format_trace = format_rdma_input_trace,
.type = VLIB_NODE_TYPE_INPUT,
.state = VLIB_NODE_STATE_DISABLED,
.n_errors = RDMA_INPUT_N_ERROR,
.error_strings = rdma_input_error_strings,
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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