The branch stable/13 has been updated by tuexen:
URL:
https://cgit.FreeBSD.org/src/commit/?id=41988a137d556b0e4bd6259bc7af0c63f6975596
commit 41988a137d556b0e4bd6259bc7af0c63f6975596
Author: Michael Tuexen <tue...@freebsd.org>
AuthorDate: 2023-11-09 10:37:27 +0000
Commit: Michael Tuexen <tue...@freebsd.org>
CommitDate: 2024-01-12 17:53:19 +0000
if_tuntap: support receive checksum offloading for tap interfaces
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)
---
sys/net/if_tuntap.c | 34 +++++++++++++++++++++++++++++++---
1 file changed, 31 insertions(+), 3 deletions(-)
diff --git a/sys/net/if_tuntap.c b/sys/net/if_tuntap.c
index 29e9c05e52bc..9cadd971eb37 100644
--- a/sys/net/if_tuntap.c
+++ b/sys/net/if_tuntap.c
@@ -970,6 +970,8 @@ 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) {
@@ -1777,9 +1779,35 @@ 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. */
