[dpdk-dev] [PATCH v3 4/5] net/vhost: remove limit of vhost TX burst size
Zhiyong Yang
zhiyong.yang at intel.com
Wed Mar 29 09:16:15 CEST 2017
vhost removes limit of TX burst size(32 pkts) and supports to make
an best effort to transmit pkts.
Cc: yuanhan.liu at linux.intel.com
Cc: maxime.coquelin at redhat.com
Signed-off-by: Zhiyong Yang <zhiyong.yang at intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
---
drivers/net/vhost/rte_eth_vhost.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index abe91c7..2a38b19 100644
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -52,6 +52,7 @@
#define ETH_VHOST_QUEUES_ARG "queues"
#define ETH_VHOST_CLIENT_ARG "client"
#define ETH_VHOST_DEQUEUE_ZERO_COPY "dequeue-zero-copy"
+#define VHOST_MAX_PKT_BURST 32
static const char *valid_arguments[] = {
ETH_VHOST_IFACE_ARG,
@@ -424,6 +425,7 @@ eth_vhost_tx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
{
struct vhost_queue *r = q;
uint16_t i, nb_tx = 0;
+ uint16_t nb_send = nb_bufs;
if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
return 0;
@@ -434,8 +436,19 @@ eth_vhost_tx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
goto out;
/* Enqueue packets to guest RX queue */
- nb_tx = rte_vhost_enqueue_burst(r->vid,
- r->virtqueue_id, bufs, nb_bufs);
+ while (nb_send) {
+ uint16_t nb_pkts;
+ uint16_t num = (uint16_t)RTE_MIN(nb_send,
+ VHOST_MAX_PKT_BURST);
+
+ nb_pkts = rte_vhost_enqueue_burst(r->vid, r->virtqueue_id,
+ &bufs[nb_tx], num);
+
+ nb_tx += nb_pkts;
+ nb_send -= nb_pkts;
+ if (nb_pkts < num)
+ break;
+ }
r->stats.pkts += nb_tx;
r->stats.missed_pkts += nb_bufs - nb_tx;
--
2.7.4
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