net/vhost: free consumed Tx buffers on demand

Add support to the vHostdriver for the new API to force free consumed
buffers on Tx ring. vHost does not cache the mbufs so there is no work
to do.

Signed-off-by: Billy McFall <bmcfall@redhat.com>
Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Keith Wiles <keith.wiles@intel.com>

diff --git a/doc/guides/nics/features/vhost.ini b/doc/guides/nics/features/vhost.ini
index 23166fb..dffd1f4 100644 (file)
--- a/doc/guides/nics/features/vhost.ini
+++ b/doc/guides/nics/features/vhost.ini
@@ -6,6 +6,7 @@
 [Features]
 Link status          = Y
 Link status event    = Y
+Free Tx mbuf on demand = Y
 Queue status event   = Y
 Basic stats          = Y
 Extended stats       = Y

diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index e98cffd..abe91c7 100644 (file)
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -959,6 +959,16 @@ eth_queue_release(void *q)
        rte_free(q);
 }
 
+static int
+eth_tx_done_cleanup(void *txq __rte_unused, uint32_t free_cnt __rte_unused)
+{
+       /*
+        * vHost does not hang onto mbuf. eth_vhost_tx() copies packet data
+        * and releases mbuf, so nothing to cleanup.
+        */
+       return 0;
+}
+
 static int
 eth_link_update(struct rte_eth_dev *dev __rte_unused,
                int wait_to_complete __rte_unused)
@@ -1001,6 +1011,7 @@ static const struct eth_dev_ops ops = {
        .tx_queue_setup = eth_tx_queue_setup,
        .rx_queue_release = eth_queue_release,
        .tx_queue_release = eth_queue_release,
+       .tx_done_cleanup = eth_tx_done_cleanup,
        .link_update = eth_link_update,
        .stats_get = eth_stats_get,
        .stats_reset = eth_stats_reset,