memif: try harder to transmit packets

Change-Id: I1e57a86b8872798a888e7d6128d9c4537a8090e6
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 8 insertions, 13 deletions

diff --git a/src/plugins/memif/device.c b/src/plugins/memif/device.c
index fa3a4eda40d..5f670563fcb 100644
--- a/src/plugins/memif/device.c
+++ b/src/plugins/memif/device.c
@@ -31,8 +31,7 @@
 #define foreach_memif_tx_func_error	       \
 _(NO_FREE_SLOTS, "no free tx slots")           \
 _(TRUNC_PACKET, "packet > buffer size -- truncated in tx ring") \
-_(PENDING_MSGS, "pending msgs in tx ring") \
-_(NO_TX_QUEUES, "no tx queues")
+_(PENDING_MSGS, "pending msgs in tx ring")
 
 typedef enum
 {
@@ -173,13 +172,7 @@ memif_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
   u32 thread_index = vlib_get_thread_index ();
   u8 tx_queues = vec_len (mif->tx_queues);
   memif_queue_t *mq;
-
-  if (PREDICT_FALSE (tx_queues == 0))
-    {
-      vlib_error_count (vm, node->node_index, MEMIF_TX_ERROR_NO_TX_QUEUES,
-			n_left);
-      goto error;
-    }
+  int n_retries = 5;
 
   if (tx_queues < vec_len (vlib_mains))
     {
@@ -187,13 +180,13 @@ memif_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
       clib_spinlock_lock_if_init (&mif->lockp);
     }
   else
-    {
-      qid = thread_index;
-    }
+    qid = thread_index;
+
   mq = vec_elt_at_index (mif->tx_queues, qid);
   ring = mq->ring;
   ring_size = 1 << mq->log2_ring_size;
   mask = ring_size - 1;
+retry:
 
   /* free consumed buffers */
 
@@ -237,6 +230,9 @@ memif_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
   CLIB_MEMORY_STORE_BARRIER ();
   ring->head = head;
 
+  if (n_left && n_retries--)
+    goto retry;
+
   clib_spinlock_unlock_if_init (&mif->lockp);
 
   if (n_left)
@@ -252,7 +248,6 @@ memif_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
       mq->int_count++;
     }
 
-error:
   vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors);
 
   return frame->n_vectors;