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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 <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
rdma_device_input_refill (vlib_main_t * vm, rdma_device_t * rd,
rdma_rxq_t * rxq)
{
u32 n_alloc, n;
struct ibv_sge sg_entry;
struct ibv_recv_wr wr, *bad_wr;
u32 buffers[VLIB_FRAME_SIZE];
if (rxq->n_enq >= rxq->size)
return;
n_alloc = clib_min (VLIB_FRAME_SIZE, rxq->size - rxq->n_enq);
n_alloc = vlib_buffer_alloc (vm, buffers, n_alloc);
sg_entry.length = vlib_buffer_get_default_data_size (vm);
sg_entry.lkey = rd->mr->lkey;
wr.num_sge = 1;
wr.sg_list = &sg_entry;
wr.next = NULL;
for (n = 0; n < n_alloc; n++)
{
vlib_buffer_t *b = vlib_get_buffer (vm, buffers[n]);
sg_entry.addr = vlib_buffer_get_va (b);
wr.wr_id = buffers[n];
if (ibv_post_recv (rxq->qp, &wr, &bad_wr) != 0)
vlib_buffer_free (vm, buffers + n, 1);
else
rxq->n_enq++;
}
}
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)
{
vnet_main_t *vnm = vnet_get_main ();
rdma_rxq_t *rxq = vec_elt_at_index (rd->rxqs, qid);
u32 n_trace;
struct ibv_wc wc[VLIB_FRAME_SIZE];
u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
u32 *bi, *to_next, n_left_to_next;
int i;
u32 n_rx_packets = 0, n_rx_bytes = 0;
n_rx_packets = ibv_poll_cq (rxq->cq, VLIB_FRAME_SIZE, wc);
if (n_rx_packets <= 0)
rdma_device_input_refill (vm, rd, rxq);
if (PREDICT_FALSE (rd->per_interface_next_index != ~0))
next_index = rd->per_interface_next_index;
vlib_get_new_next_frame (vm, node, next_index, to_next, n_left_to_next);
for (i = 0; i < n_rx_packets; i++)
{
u32 bi = wc[i].wr_id;
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
b->current_length = wc[i].byte_len;
vnet_buffer (b)->sw_if_index[VLIB_RX] = rd->sw_if_index;
vnet_buffer (b)->sw_if_index[VLIB_TX] = ~0;
to_next[i] = bi;
n_rx_bytes += wc[i].byte_len;
}
if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
{
u32 n_left = n_rx_packets, i = 0;
bi = to_next;
while (n_trace && n_left)
{
vlib_buffer_t *b;
rdma_input_trace_t *tr;
b = vlib_get_buffer (vm, bi[0]);
vlib_trace_buffer (vm, node, next_index, b, /* follow_chain */ 0);
tr = vlib_add_trace (vm, node, b, sizeof (*tr));
tr->next_index = next_index;
tr->hw_if_index = rd->hw_if_index;
/* next */
n_trace--;
n_left--;
bi++;
i++;
}
vlib_set_trace_count (vm, node, n_trace);
}
if (PREDICT_TRUE (next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT))
{
vlib_next_frame_t *nf;
vlib_frame_t *f;
ethernet_input_frame_t *ef;
nf = vlib_node_runtime_get_next_frame (vm, node, next_index);
f = vlib_get_frame (vm, nf->frame_index);
f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX;
ef = vlib_frame_scalar_args (f);
ef->sw_if_index = rd->sw_if_index;
ef->hw_if_index = rd->hw_if_index;
//f->flags |= ETH_INPUT_FRAME_F_IP4_CKSUM_OK;
}
n_left_to_next -= n_rx_packets;
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
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;
}
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_device_input_runtime_t *rt = (void *) node->runtime_data;
vnet_device_and_queue_t *dq;
foreach_device_and_queue (dq, rt->devices_and_queues)
{
rdma_device_t *rd;
rd = vec_elt_at_index (rm->devices, dq->dev_instance);
if ((rd->flags & RDMA_DEVICE_F_ADMIN_UP) == 0)
continue;
n_rx += rdma_device_input_inline (vm, node, frame, rd, dq->queue_id);
}
return n_rx;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (rdma_input_node) = {
.name = "rdma-input",
.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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