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examples/vhost: fix offload settings

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Comments for PKT_TX_TCP_SEG at rte_mbuf says that we should only set
PKT_TX_IP_CKSUM and reset ip hdr checksum for IPv4:

  - if it's IPv4, set the PKT_TX_IP_CKSUM flag and write the IP checksum
    to 0 in the packet

Fixes: 9fd72e3cbd29 ("examples/vhost: add virtio offload")

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
This commit is contained in:
Yuanhan Liu 2016-03-25 15:58:51 +08:00 committed by Thomas Monjalon
parent 5674dad222
commit df40169ac0
1 changed files with 6 additions and 3 deletions
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9
examples/vhost/main.c
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@ -1163,10 +1163,13 @@ static void virtio_tx_offload(struct rte_mbuf *m)
l3_hdr = (char *)eth_hdr + m->l2_len;
ipv4_hdr = (struct ipv4_hdr *)l3_hdr;
if (m->ol_flags & PKT_TX_IPV4) {
ipv4_hdr = l3_hdr;
ipv4_hdr->hdr_checksum = 0;
m->ol_flags |= PKT_TX_IP_CKSUM;
}
tcp_hdr = (struct tcp_hdr *)((char *)l3_hdr + m->l3_len);
m->ol_flags |= PKT_TX_IP_CKSUM;
ipv4_hdr->hdr_checksum = 0;
tcp_hdr->cksum = get_psd_sum(l3_hdr, m->ol_flags);
}