From b08b8cfeb2aea2a703d201ad8c4b258e8a0bde12 Mon Sep 17 00:00:00 2001 From: Jianfeng Tan Date: Wed, 7 Jun 2017 06:41:37 +0000 Subject: [PATCH] vhost: fix IP checksum There is no way to bypass IP checksum verification in Linux kernel, no matter skb->ip_summed is assigned as CHECKSUM_UNNECESSARY or CHECKSUM_PARTIAL. So any packets with bad IP checksum will be dropped at VM IP layer. To correct, we check this flag PKT_TX_IP_CKSUM to calculate IP csum. Fixes: 859b480d5afd ("vhost: add guest offload setting") Cc: stable@dpdk.org Signed-off-by: Jianfeng Tan Reviewed-by: Maxime Coquelin Acked-by: Yuanhan Liu --- lib/librte_vhost/virtio_net.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c index d095f64902..88b74f172c 100644 --- a/lib/librte_vhost/virtio_net.c +++ b/lib/librte_vhost/virtio_net.c @@ -143,6 +143,15 @@ virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr) ASSIGN_UNLESS_EQUAL(net_hdr->flags, 0); } + /* IP cksum verification cannot be bypassed, then calculate here */ + if (m_buf->ol_flags & PKT_TX_IP_CKSUM) { + struct ipv4_hdr *ipv4_hdr; + + ipv4_hdr = rte_pktmbuf_mtod_offset(m_buf, struct ipv4_hdr *, + m_buf->l2_len); + ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr); + } + if (m_buf->ol_flags & PKT_TX_TCP_SEG) { if (m_buf->ol_flags & PKT_TX_IPV4) net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; -- 2.20.1