From mboxrd@z Thu Jan 1 00:00:00 1970 From: linhaifeng Subject: [PATCH] lib/librte_pmd_virtio fix can't receive packets after rx_q is empty Date: Fri, 20 Mar 2015 18:46:23 +0800 Message-ID: <1426848383-15764-1-git-send-email-haifeng.lin@huawei.com> Mime-Version: 1.0 Content-Type: text/plain To: Return-path: List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org Sender: "dev" From: Linhaifeng If failed to alloc mbuf ring_size times the rx_q may be empty and can't receive any packets forever because nb_used is 0 forever. so we should try to refill when nb_used is 0.After otherone free mbuf we can restart to receive packets. Signed-off-by: Linhaifeng --- lib/librte_pmd_virtio/virtio_rxtx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/librte_pmd_virtio/virtio_rxtx.c b/lib/librte_pmd_virtio/virtio_rxtx.c index 1d74b34..5c7e0cd 100644 --- a/lib/librte_pmd_virtio/virtio_rxtx.c +++ b/lib/librte_pmd_virtio/virtio_rxtx.c @@ -495,7 +495,7 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) num = num - ((rxvq->vq_used_cons_idx + num) % DESC_PER_CACHELINE); if (num == 0) - return 0; + goto refill; num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, num); PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num); @@ -536,6 +536,7 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) rxvq->packets += nb_rx; +refill: /* Allocate new mbuf for the used descriptor */ error = ENOSPC; while (likely(!virtqueue_full(rxvq))) { -- 1.8.5.2.msysgit.0