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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 u16
rdma_device_output_tx (vlib_main_t * vm, rdma_device_t * rd, rdma_txq_t * txq,
u32 * buffers, u16 n_left, u32 * n_tx_packets,
u32 * n_tx_bytes)
{
struct ibv_sge sg_entry;
struct ibv_send_wr wr, *bad_wr;
u16 i;
for (i = 0; i < n_left; i++)
{
vlib_buffer_t *b = vlib_get_buffer (vm, buffers[i]);
sg_entry.addr = vlib_buffer_get_current_va (b);
sg_entry.length = b->current_length;
sg_entry.lkey = rd->mr->lkey;
memset (&wr, 0, sizeof (wr));
wr.num_sge = 1;
wr.sg_list = &sg_entry;
wr.opcode = IBV_WR_SEND;
wr.send_flags = IBV_SEND_SIGNALED;
wr.wr_id = buffers[i];
if (ibv_post_send (txq->qp, &wr, &bad_wr) != 0)
break;
*n_tx_bytes += b->current_length;
}
*n_tx_packets += i;
return i;
}
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)
{
vnet_main_t *vnm = vnet_get_main ();
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;
u8 qid = thread_index;
rdma_txq_t *txq = vec_elt_at_index (rd->txqs, qid % vec_len (rd->txqs));
u32 *buffers = vlib_frame_vector_args (frame);
u16 n_left;
u16 n_retry = 5;
u32 n_tx_packets = 0, n_tx_bytes = 0;
clib_spinlock_lock_if_init (&txq->lock);
n_left = frame->n_vectors;
while (n_left)
{
u16 n;
rdma_device_output_free (vm, txq);
n =
rdma_device_output_tx (vm, rd, txq, buffers, n_left, &n_tx_packets,
&n_tx_bytes);
n_left -= n;
buffers += n;
if (n_left && n_retry--)
{
vlib_buffer_free (vm, buffers, n_left);
vlib_error_count (vm, node->node_index,
RDMA_TX_ERROR_NO_FREE_SLOTS, n_left);
break;
}
}
clib_spinlock_unlock_if_init (&txq->lock);
vlib_increment_combined_counter
(vnm->interface_main.combined_sw_if_counters +
VNET_INTERFACE_COUNTER_TX, thread_index,
rd->hw_if_index, n_tx_packets, n_tx_bytes);
return frame->n_vectors - n_left;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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