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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 <avf/avf.h>
#define AVF_TXQ_DESC_CMD(x) (1 << (x + 4))
#define AVF_TXQ_DESC_CMD_EOP AVF_TXQ_DESC_CMD(0)
#define AVF_TXQ_DESC_CMD_RS AVF_TXQ_DESC_CMD(1)
#define AVF_TXQ_DESC_CMD_RSV AVF_TXQ_DESC_CMD(2)
static_always_inline u8
avf_tx_desc_get_dtyp (avf_tx_desc_t * d)
{
return d->qword[1] & 0x0f;
}
VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
avf_main_t *am = &avf_main;
vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
avf_device_t *ad = pool_elt_at_index (am->devices, rd->dev_instance);
u32 thread_index = vm->thread_index;
u8 qid = thread_index;
avf_txq_t *txq = vec_elt_at_index (ad->txqs, qid % ad->num_queue_pairs);
avf_tx_desc_t *d0, *d1, *d2, *d3;
u32 *buffers = vlib_frame_args (frame);
u32 bi0, bi1, bi2, bi3;
u16 n_left, n_left_to_send, n_in_batch;
vlib_buffer_t *b0, *b1, *b2, *b3;
u16 next;
u16 n_retry = 5;
u16 mask = txq->size - 1;
u64 bits = (AVF_TXQ_DESC_CMD_EOP | AVF_TXQ_DESC_CMD_RS |
AVF_TXQ_DESC_CMD_RSV);
clib_spinlock_lock_if_init (&txq->lock);
n_left_to_send = frame->n_vectors;
next = txq->next;
retry:
/* release consumed bufs */
if (txq->n_enqueued)
{
u16 first, slot, n_free = 0;
first = slot = (next - txq->n_enqueued) & mask;
d0 = txq->descs + slot;
while (n_free < txq->n_enqueued && avf_tx_desc_get_dtyp (d0) == 0x0F)
{
n_free++;
slot = (slot + 1) & mask;
d0 = txq->descs + slot;
}
if (n_free)
{
txq->n_enqueued -= n_free;
vlib_buffer_free_from_ring (vm, txq->bufs, first, txq->size,
n_free);
}
}
n_in_batch = clib_min (n_left_to_send, txq->size - txq->n_enqueued - 8);
n_left = n_in_batch;
while (n_left >= 8)
{
u16 slot0, slot1, slot2, slot3;
vlib_prefetch_buffer_with_index (vm, buffers[4], LOAD);
vlib_prefetch_buffer_with_index (vm, buffers[5], LOAD);
vlib_prefetch_buffer_with_index (vm, buffers[6], LOAD);
vlib_prefetch_buffer_with_index (vm, buffers[7], LOAD);
slot0 = next;
slot1 = (next + 1) & mask;
slot2 = (next + 2) & mask;
slot3 = (next + 3) & mask;
d0 = txq->descs + slot0;
d1 = txq->descs + slot1;
d2 = txq->descs + slot2;
d3 = txq->descs + slot3;
bi0 = buffers[0];
bi1 = buffers[1];
bi2 = buffers[2];
bi3 = buffers[3];
txq->bufs[slot0] = bi0;
txq->bufs[slot1] = bi1;
txq->bufs[slot2] = bi2;
txq->bufs[slot3] = bi3;
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
b2 = vlib_get_buffer (vm, bi2);
b3 = vlib_get_buffer (vm, bi3);
if (ad->flags & AVF_DEVICE_F_VA_DMA)
{
d0->qword[0] = vlib_buffer_get_current_va (b0);
d1->qword[0] = vlib_buffer_get_current_va (b1);
d2->qword[0] = vlib_buffer_get_current_va (b2);
d3->qword[0] = vlib_buffer_get_current_va (b3);
}
else
{
d0->qword[0] = vlib_buffer_get_current_pa (vm, b0);
d1->qword[0] = vlib_buffer_get_current_pa (vm, b1);
d2->qword[0] = vlib_buffer_get_current_pa (vm, b2);
d3->qword[0] = vlib_buffer_get_current_pa (vm, b3);
}
d0->qword[1] = ((u64) b0->current_length) << 34 | bits;
d1->qword[1] = ((u64) b1->current_length) << 34 | bits;
d2->qword[1] = ((u64) b2->current_length) << 34 | bits;
d3->qword[1] = ((u64) b3->current_length) << 34 | bits;
next = (next + 4) & mask;
txq->n_enqueued += 4;
buffers += 4;
n_left -= 4;
}
while (n_left)
{
d0 = txq->descs + next;
bi0 = buffers[0];
txq->bufs[next] = bi0;
b0 = vlib_get_buffer (vm, bi0);
if (ad->flags & AVF_DEVICE_F_VA_DMA)
d0->qword[0] = vlib_buffer_get_current_va (b0);
else
d0->qword[0] = vlib_buffer_get_current_pa (vm, b0);
d0->qword[1] = (((u64) b0->current_length) << 34) | bits;
next = (next + 1) & mask;
txq->n_enqueued++;
buffers++;
n_left--;
}
CLIB_MEMORY_BARRIER ();
*(txq->qtx_tail) = txq->next = next;
n_left_to_send -= n_in_batch;
if (n_left_to_send)
{
if (n_retry--)
goto retry;
vlib_buffer_free (vm, buffers, n_left_to_send);
vlib_error_count (vm, node->node_index,
AVF_TX_ERROR_NO_FREE_SLOTS, n_left_to_send);
}
clib_spinlock_unlock_if_init (&txq->lock);
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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