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path: root/src/plugins/vmxnet3/output.c
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Diffstat (limited to 'src/plugins/vmxnet3/output.c')
-rw-r--r--src/plugins/vmxnet3/output.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/src/plugins/vmxnet3/output.c b/src/plugins/vmxnet3/output.c
index c80ad0706cc..2886c31edf7 100644
--- a/src/plugins/vmxnet3/output.c
+++ b/src/plugins/vmxnet3/output.c
@@ -109,7 +109,7 @@ VNET_DEVICE_CLASS_TX_FN (vmxnet3_device_class) (vlib_main_t * vm,
u16 n_left = frame->n_vectors;
vmxnet3_txq_t *txq;
u32 thread_index = vm->thread_index;
- u16 qid = thread_index;
+ u16 qid = thread_index, produce;
if (PREDICT_FALSE (!(vd->flags & VMXNET3_DEVICE_F_LINK_UP)))
{
@@ -124,7 +124,8 @@ VNET_DEVICE_CLASS_TX_FN (vmxnet3_device_class) (vlib_main_t * vm,
vmxnet3_txq_release (vm, vd, txq);
- while (n_left)
+ produce = txq->tx_ring.produce;
+ while (PREDICT_TRUE (n_left))
{
u16 space_needed = 1, i;
vlib_buffer_t *b;
@@ -195,13 +196,15 @@ VNET_DEVICE_CLASS_TX_FN (vmxnet3_device_class) (vlib_main_t * vm,
* Device can start reading the packet
*/
txq->tx_desc[first_idx].flags[0] ^= VMXNET3_TXF_GEN;
- vmxnet3_reg_write_inline (vd, 0, VMXNET3_REG_TXPROD,
- txq->tx_ring.produce);
buffers++;
n_left--;
}
+ if (PREDICT_TRUE (produce != txq->tx_ring.produce))
+ vmxnet3_reg_write_inline (vd, 0, VMXNET3_REG_TXPROD,
+ txq->tx_ring.produce);
+
clib_spinlock_unlock_if_init (&txq->lock);
return (frame->n_vectors - n_left);