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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 <vppinfra/ring.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/devices/devices.h>
#include <rdma/rdma.h>
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;
n_free = ibv_poll_cq (txq->cq, VLIB_FRAME_SIZE, wc);
if (n_free <= 0)
return;
for (i = 0; i < n_free; i++)
to_free[i] = wc[i].wr_id;
vlib_buffer_free (vm, to_free, n_free);
}
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, *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;
f = from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
vlib_get_buffers (vm, from, bufs, n_left_from);
memset (w, 0, n_left_from * sizeof (w[0]));
while (n_left_from >= 2)
{
if (PREDICT_TRUE (n_left_from >= 4))
{
vlib_prefetch_buffer_header (b[2 + 0], LOAD);
vlib_prefetch_buffer_header (b[2 + 1], LOAD);
CLIB_PREFETCH (&s[2 + 0], sizeof (s[0]), STORE);
CLIB_PREFETCH (&s[2 + 1], sizeof (s[0]), STORE);
CLIB_PREFETCH (&w[2 + 0], sizeof (w[0]), STORE);
CLIB_PREFETCH (&w[2 + 1], sizeof (w[0]), STORE);
}
s[0].addr = vlib_buffer_get_current_va (b[0]);
s[0].length = b[0]->current_length;
s[0].lkey = rd->mr->lkey;
s[1].addr = vlib_buffer_get_current_va (b[1]);
s[1].length = b[1]->current_length;
s[1].lkey = rd->mr->lkey;
w[0].wr_id = f[0];
w[0].next = &w[1 + 0];
w[0].sg_list = &s[0];
w[0].num_sge = 1;
w[0].opcode = IBV_WR_SEND;
w[0].send_flags = IBV_SEND_SIGNALED;
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[1].send_flags = IBV_SEND_SIGNALED;
s += 2;
f += 2;
w += 2;
b += 2;
n_left_from -= 2;
}
while (n_left_from >= 1)
{
s[0].addr = vlib_buffer_get_current_va (b[0]);
s[0].length = b[0]->current_length;
s[0].lkey = rd->mr->lkey;
w[0].wr_id = f[0];
w[0].next = &w[1 + 0];
w[0].sg_list = &s[0];
w[0].num_sge = 1;
w[0].opcode = IBV_WR_SEND;
w[0].send_flags = IBV_SEND_SIGNALED;
s += 1;
f += 1;
w += 1;
b += 1;
n_left_from -= 1;
}
w[-1].next = 0; /* fix next pointer in WR linked-list last item */
w = wr;
clib_spinlock_lock_if_init (&txq->lock);
for (i = 0; i < 5; i++)
{
rdma_device_output_free (vm, txq);
if (0 == ibv_post_send (txq->qp, w, &w))
break;
}
clib_spinlock_unlock_if_init (&txq->lock);
n_tx_packets = w == wr ? frame->n_vectors : w - wr;
n_tx_failed = frame->n_vectors - n_tx_packets;
if (PREDICT_FALSE (n_tx_failed))
{
vlib_buffer_free (vm, &from[n_tx_packets], n_tx_failed);
vlib_error_count (vm, node->node_index,
RDMA_TX_ERROR_NO_FREE_SLOTS, n_tx_failed);
}
return n_tx_packets;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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