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authorDamjan Marion <damarion@cisco.com>2018-08-28 19:40:30 +0200
committerDamjan Marion <dmarion@me.com>2018-08-28 19:45:51 +0000
commitfcf9497d3bcd34b8b5090ee053575296cf56c5e6 (patch)
treefda062ddccc568ad984ef69ae424ec172a8fecb3 /src/plugins/avf/output.c
parentf2de90d7244364d110214dd0cb9f206d4bb68ad5 (diff)
avf: deal willth tx ring full properly
Change-Id: I0b38e129ee01d212463253e5526bfc2d60fd88af Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/plugins/avf/output.c')
-rw-r--r--src/plugins/avf/output.c44
1 files changed, 33 insertions, 11 deletions
diff --git a/src/plugins/avf/output.c b/src/plugins/avf/output.c
index 2001c117d38..a094050d6ac 100644
--- a/src/plugins/avf/output.c
+++ b/src/plugins/avf/output.c
@@ -47,19 +47,25 @@ VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
avf_tx_desc_t *d0, *d1, *d2, *d3;
u32 *buffers = vlib_frame_args (frame);
u32 bi0, bi1, bi2, bi3;
- u16 n_left = frame->n_vectors;
+ 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 cosumed bufs */
if (txq->n_enqueued)
{
u16 first, slot, n_free = 0;
- first = slot = (txq->next - txq->n_enqueued) & mask;
+ first = slot = (next - txq->n_enqueued) & mask;
d0 = txq->descs + slot;
while (n_free < txq->n_enqueued && avf_tx_desc_get_dtyp (d0) == 0x0F)
{
@@ -76,6 +82,9 @@ VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
}
}
+ 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;
@@ -85,10 +94,10 @@ VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
vlib_prefetch_buffer_with_index (vm, buffers[6], LOAD);
vlib_prefetch_buffer_with_index (vm, buffers[7], LOAD);
- slot0 = txq->next;
- slot1 = (txq->next + 1) & mask;
- slot2 = (txq->next + 2) & mask;
- slot3 = (txq->next + 3) & mask;
+ slot0 = next;
+ slot1 = (next + 1) & mask;
+ slot2 = (next + 2) & mask;
+ slot3 = (next + 3) & mask;
d0 = txq->descs + slot0;
d1 = txq->descs + slot1;
@@ -124,7 +133,7 @@ VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
d2->qword[1] = ((u64) b2->current_length) << 34 | bits;
d3->qword[1] = ((u64) b3->current_length) << 34 | bits;
- txq->next = (txq->next + 4) & mask;
+ next = (next + 4) & mask;
txq->n_enqueued += 4;
buffers += 4;
n_left -= 4;
@@ -132,9 +141,9 @@ VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
while (n_left)
{
- d0 = txq->descs + txq->next;
+ d0 = txq->descs + next;
bi0 = buffers[0];
- txq->bufs[txq->next] = bi0;
+ txq->bufs[next] = bi0;
b0 = vlib_get_buffer (vm, bi0);
#if 0
@@ -145,13 +154,26 @@ VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
#endif
d0->qword[1] = (((u64) b0->current_length) << 34) | bits;
- txq->next = (txq->next + 1) & mask;
+ next = (next + 1) & mask;
txq->n_enqueued++;
buffers++;
n_left--;
}
+
CLIB_MEMORY_BARRIER ();
- *(txq->qtx_tail) = txq->next;
+ *(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);