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[
    {
        "id": 96730,
        "web_url": "http://patches.dpdk.org/comment/96730/",
        "msgid": "<CAJFAV8x1PiR_X1hK08uJ=+Gd0g3YSe2G_6cgoP0AmneTvA_ZWA@mail.gmail.com>",
        "list_archive_url": "https://inbox.dpdk.org/dev/CAJFAV8x1PiR_X1hK08uJ=+Gd0g3YSe2G_6cgoP0AmneTvA_ZWA@mail.gmail.com",
        "date": "2019-06-05T09:34:53",
        "subject": "Re: [dpdk-dev] [dpdk-stable] [PATCH v2 2/4] net/virtio: fix\n\tsegmented packet issue in mergeable Rx path",
        "submitter": {
            "id": 1173,
            "url": "http://patches.dpdk.org/api/people/1173/",
            "name": "David Marchand",
            "email": "david.marchand@redhat.com"
        },
        "content": "On Wed, Jun 5, 2019 at 10:11 AM Maxime Coquelin <maxime.coquelin@redhat.com>\nwrote:\n\n> After having dequeued a burst of descriptors, there may be a\n> need to dequeue a few more if the last packet was segmented\n> and not complete. When it happens, the extra segments were\n> not properly attached to the mbuf chain, and so were lost.\n>\n> Also, head segment data_len field is wrongly summed with\n> the length of all the segments of the chain.\n>\n> This patch fixes both the mbuf chaining and head segment's\n> data_len field\n>\n> Fixes: bcac5aa207f8 (\"net/virtio: improve batching in mergeable path\")\n> Cc: stable@dpdk.org\n>\n> Reported-by: Yaroslav Brustinov <ybrustin@cisco.com>\n> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>\n> ---\n>  drivers/net/virtio/virtio_rxtx.c | 4 +---\n>  1 file changed, 1 insertion(+), 3 deletions(-)\n>\n> diff --git a/drivers/net/virtio/virtio_rxtx.c\n> b/drivers/net/virtio/virtio_rxtx.c\n> index 6b3baf0423..9469ecb743 100644\n> --- a/drivers/net/virtio/virtio_rxtx.c\n> +++ b/drivers/net/virtio/virtio_rxtx.c\n> @@ -1614,7 +1614,7 @@ virtio_recv_mergeable_pkts(void *rx_queue,\n>         struct virtqueue *vq = rxvq->vq;\n>         struct virtio_hw *hw = vq->hw;\n>         struct rte_mbuf *rxm;\n> -       struct rte_mbuf *prev;\n> +       struct rte_mbuf *prev = NULL;\n>         uint16_t nb_used, num, nb_rx = 0;\n>         uint32_t len[VIRTIO_MBUF_BURST_SZ];\n>         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];\n> @@ -1721,7 +1721,6 @@ virtio_recv_mergeable_pkts(void *rx_queue,\n>                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,\n>                                         VIRTIO_MBUF_BURST_SZ);\n>\n> -               prev = rcv_pkts[nb_rx];\n>                 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {\n>                         virtio_rmb(hw->weak_barriers);\n>                         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len,\n> @@ -1738,7 +1737,6 @@ virtio_recv_mergeable_pkts(void *rx_queue,\n>                                 prev->next = rxm;\n>                                 prev = rxm;\n>                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];\n> -                               rx_pkts[nb_rx]->data_len += len[extra_idx];\n>                                 extra_idx += 1;\n>                         };\n>                         seg_res -= rcv_cnt;\n> --\n> 2.21.0\n>\n>\nIdem previous patch, you have missed a data_len line 1704.\nReviewed-by: David Marchand <david.marchand@redhat.com>",
        "headers": {
            "Subject": "Re: [dpdk-dev] [dpdk-stable] [PATCH v2 2/4] net/virtio: fix\n\tsegmented packet issue in mergeable Rx path",
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            "Message-ID": "<CAJFAV8x1PiR_X1hK08uJ=+Gd0g3YSe2G_6cgoP0AmneTvA_ZWA@mail.gmail.com>",
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            "From": "David Marchand <david.marchand@redhat.com>",
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            "Date": "Wed, 5 Jun 2019 11:34:53 +0200",
            "In-Reply-To": "<20190605081005.15716-3-maxime.coquelin@redhat.com>",
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            "References": "<20190605081005.15716-1-maxime.coquelin@redhat.com>\n\t<20190605081005.15716-3-maxime.coquelin@redhat.com>",
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