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userspace: Enable IP checksum offloading by default.

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The netdev receiving packets is supposed to provide the flags
indicating if the IP checksum was verified and it is GOOD or BAD,
otherwise the stack will check when appropriate by software.

If the packet comes with good checksum, then postpone the
checksum calculation to the egress device if needed.

When encapsulate a packet with that flag, set the checksum
of the inner IP header since that is not yet supported.

Calculate the IP checksum when the packet is going to be sent over
a device that doesn't support the feature.

Linux devices don't support IP checksum offload alone, so the
support is not enabled.

Signed-off-by: Flavio Leitner <fbl@sysclose.org>
Co-authored-by: Flavio Leitner <fbl@sysclose.org>
Signed-off-by: Mike Pattrick <mkp@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
This commit is contained in:
Mike Pattrick
2023-06-14 15:03:26 -04:00
committed by Ilya Maximets
parent 4433cc6860
commit 5d11c47d3e
16 changed files with 351 additions and 67 deletions
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21
lib/odp-execute.c
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@@ -169,9 +169,14 @@ odp_set_ipv4(struct dp_packet *packet, const struct ovs_key_ipv4 *key,
new_tos = key->ipv4_tos | (nh->ip_tos & ~mask->ipv4_tos);
if (nh->ip_tos != new_tos) {
nh->ip_csum = recalc_csum16(nh->ip_csum,
htons((uint16_t) nh->ip_tos),
htons((uint16_t) new_tos));
if (dp_packet_hwol_tx_ip_csum(packet)) {
dp_packet_ol_reset_ip_csum_good(packet);
} else {
nh->ip_csum = recalc_csum16(nh->ip_csum,
htons((uint16_t) nh->ip_tos),
htons((uint16_t) new_tos));
}
nh->ip_tos = new_tos;
}
}
@@ -180,8 +185,14 @@ odp_set_ipv4(struct dp_packet *packet, const struct ovs_key_ipv4 *key,
new_ttl = key->ipv4_ttl | (nh->ip_ttl & ~mask->ipv4_ttl);
if (OVS_LIKELY(nh->ip_ttl != new_ttl)) {
nh->ip_csum = recalc_csum16(nh->ip_csum, htons(nh->ip_ttl << 8),
htons(new_ttl << 8));
if (dp_packet_hwol_tx_ip_csum(packet)) {
dp_packet_ol_reset_ip_csum_good(packet);
} else {
nh->ip_csum = recalc_csum16(nh->ip_csum,
htons(nh->ip_ttl << 8),
htons(new_ttl << 8));
}
nh->ip_ttl = new_ttl;
}
}