[PATCH 4/5] net/vhost: remove limit of vhost TX burst size
From: Zhiyong Yang <hidden>
Date: 2017-02-24 08:48:30
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
vhost removes limit of TX burst size(32 pkts) and supports to make an best effort to transmit pkts. Cc: yuanhan.liu@linux.intel.com Cc: maxime.coquelin@redhat.com Signed-off-by: Zhiyong Yang <redacted> --- drivers/net/vhost/rte_eth_vhost.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index e98cffd..1e1fa34 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,
@@ -434,8 +435,27 @@ 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); + if (likely(nb_bufs <= VHOST_MAX_PKT_BURST)) + nb_tx = rte_vhost_enqueue_burst(r->vid, r->virtqueue_id, + bufs, nb_bufs); + else { + uint16_t nb_send = 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