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netdev-dpdk: Adjust IPv4 checksum capability for vhost-user.

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If no L4 checksum can be requested, OVS may as well compute IPv4
checksum when needed.

This allows a small optimization where the whole preparation step can
be skipped on a batch when a (vhost-user) DPDK port has no offload
capability.

Signed-off-by: David Marchand <david.marchand@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
This commit is contained in:
David Marchand 2025-06-17 09:21:03 +02:00 committed by Ilya Maximets
parent dd443c1a7a
commit ab062d3cb4
1 changed files with 10 additions and 8 deletions
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10
lib/netdev-dpdk.c
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@ -3303,10 +3303,12 @@ netdev_dpdk_common_send(struct netdev *netdev, struct dp_packet_batch *batch,
stats->tx_mtu_exceeded_drops += pkt_cnt - cnt;
pkt_cnt = cnt;
if (netdev->ol_flags) {
/* Prepare each mbuf for hardware offloading. */
cnt = netdev_dpdk_prep_hwol_batch(dev, pkts, pkt_cnt);
stats->tx_invalid_hwol_drops += pkt_cnt - cnt;
pkt_cnt = cnt;
}
/* Apply Quality of Service policy. */
cnt = netdev_dpdk_qos_run(dev, pkts, pkt_cnt, true);
@ -4910,6 +4912,10 @@ new_device(int vid)
dev->hw_ol_features |= NETDEV_TX_TCP_CKSUM_OFFLOAD;
dev->hw_ol_features |= NETDEV_TX_UDP_CKSUM_OFFLOAD;
dev->hw_ol_features |= NETDEV_TX_SCTP_CKSUM_OFFLOAD;
/* There is no support in virtio net to offload IPv4 csum,
* but the vhost library handles IPv4 csum offloading. */
dev->hw_ol_features |= NETDEV_TX_IPV4_CKSUM_OFFLOAD;
}
if (userspace_tso_enabled()
@ -4928,10 +4934,6 @@ new_device(int vid)
}
}
/* There is no support in virtio net to offload IPv4 csum,
* but the vhost library handles IPv4 csum offloading fine. */
dev->hw_ol_features |= NETDEV_TX_IPV4_CKSUM_OFFLOAD;
netdev_dpdk_update_netdev_flags(dev);
ovsrcu_index_set(&dev->vid, vid);