X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fplugins%2Fvmxnet3%2Foutput.c;h=2a6418dfa44478333d33d17204f6f9e0b817954b;hb=ffba3c3;hp=c80ad0706ccc424ca467b4a302d72b09f0f88d40;hpb=f9dafebc44c7b52605eed393a418f47ca3ce6990;p=vpp.git

diff --git a/src/plugins/vmxnet3/output.c b/src/plugins/vmxnet3/output.c
index c80ad0706cc..2a6418dfa44 100644
--- a/src/plugins/vmxnet3/output.c
+++ b/src/plugins/vmxnet3/output.c
@@ -100,7 +100,7 @@ VNET_DEVICE_CLASS_TX_FN (vmxnet3_device_class) (vlib_main_t * vm,
   vmxnet3_main_t *vmxm = &vmxnet3_main;
   vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
   vmxnet3_device_t *vd = pool_elt_at_index (vmxm->devices, rd->dev_instance);
-  u32 *buffers = vlib_frame_args (frame);
+  u32 *buffers = vlib_frame_vector_args (frame);
   u32 bi0;
   vlib_buffer_t *b0;
   vmxnet3_tx_desc *txd = 0;
@@ -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);