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if_tuntap: support receive checksum offloading for tap interfaces

Browse source 
When enabled, pretend that the IPv4 and transport layer checksum
is correct for packets injected via the character device.
This is a prerequisite for adding support for LRO, which will
be added next. Then packetdrill can be used to test the LRO
code in local mode.

Reviewed by:		rscheff, zlei
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D42477

(cherry picked from commit ff69d13a50d1d07601de0885fd94f6a09a7ba383)
This commit is contained in:
Michael Tuexen 2023-11-09 11:37:27 +01:00
parent e0f22f9e18
commit 002829ea61
1 changed files with 31 additions and 3 deletions
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34
sys/net/if_tuntap.c
View file

@ -977,6 +977,8 @@ tuncreate(struct cdev *dev)
ifp->if_flags = iflags;
IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
ifp->if_capabilities |= IFCAP_LINKSTATE;
if ((tp->tun_flags & TUN_L2) != 0)
ifp->if_capabilities |= IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6;
ifp->if_capenable |= IFCAP_LINKSTATE;
if ((tp->tun_flags & TUN_L2) != 0) {
@ -1784,9 +1786,35 @@ tunwrite_l2(struct tuntap_softc *tp, struct mbuf *m,
return (0);
}
if (vhdr != NULL && virtio_net_rx_csum(m, &vhdr->hdr)) {
m_freem(m);
return (0);
if (vhdr != NULL) {
if (virtio_net_rx_csum(m, &vhdr->hdr)) {
m_freem(m);
return (0);
}
} else {
switch (ntohs(eh->ether_type)) {
#ifdef INET
case ETHERTYPE_IP:
if (ifp->if_capenable & IFCAP_RXCSUM) {
m->m_pkthdr.csum_flags |=
CSUM_IP_CHECKED | CSUM_IP_VALID |
CSUM_DATA_VALID | CSUM_SCTP_VALID |
CSUM_PSEUDO_HDR;
m->m_pkthdr.csum_data = 0xffff;
}
break;
#endif
#ifdef INET6
case ETHERTYPE_IPV6:
if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) {
m->m_pkthdr.csum_flags |=
CSUM_DATA_VALID_IPV6 | CSUM_SCTP_VALID |
CSUM_PSEUDO_HDR;
m->m_pkthdr.csum_data = 0xffff;
}
break;
#endif
}
}
/* Pass packet up to parent. */