From 366599450dd4a85025360f1154f5d664b486e831 Mon Sep 17 00:00:00 2001 From: Maxime Coquelin Date: Wed, 5 Jun 2019 12:00:37 +0200 Subject: [PATCH] net/virtio: fix mergeable Rx with segmented packet After having dequeued a burst of descriptors, there may be a need to dequeue a few more if the last packet was segmented and not complete. When it happens, the extra segments were not properly attached to the mbuf chain, and so were lost. Also, head segment data_len field is wrongly summed with the length of all the segments of the chain. This patch fixes both the mbuf chaining and head segment's data_len field Fixes: bcac5aa207f8 ("net/virtio: improve batching in mergeable path") Cc: stable@dpdk.org Reported-by: Yaroslav Brustinov Reviewed-by: David Marchand Reviewed-by: Tiwei Bie Signed-off-by: Maxime Coquelin --- drivers/net/virtio/virtio_rxtx.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c index 62d5a41749..e23cd04dd8 100644 --- a/drivers/net/virtio/virtio_rxtx.c +++ b/drivers/net/virtio/virtio_rxtx.c @@ -1608,7 +1608,7 @@ virtio_recv_mergeable_pkts(void *rx_queue, struct virtqueue *vq = rxvq->vq; struct virtio_hw *hw = vq->hw; struct rte_mbuf *rxm; - struct rte_mbuf *prev; + struct rte_mbuf *prev = NULL; uint16_t nb_used, num, nb_rx = 0; uint32_t len[VIRTIO_MBUF_BURST_SZ]; struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; @@ -1695,7 +1695,6 @@ virtio_recv_mergeable_pkts(void *rx_queue, rxm->data_len = (uint16_t)(len[i]); rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]); - rx_pkts[nb_rx]->data_len += (uint16_t)(len[i]); if (prev) prev->next = rxm; @@ -1715,7 +1714,6 @@ virtio_recv_mergeable_pkts(void *rx_queue, uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res, VIRTIO_MBUF_BURST_SZ); - prev = rcv_pkts[nb_rx]; if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) { virtio_rmb(hw->weak_barriers); num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, @@ -1732,7 +1730,6 @@ virtio_recv_mergeable_pkts(void *rx_queue, prev->next = rxm; prev = rxm; rx_pkts[nb_rx]->pkt_len += len[extra_idx]; - rx_pkts[nb_rx]->data_len += len[extra_idx]; extra_idx += 1; }; seg_res -= rcv_cnt; -- 2.20.1