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Date:      Sun, 26 Apr 2026 07:47:56 +0000
From:      Michael Tuexen <tuexen@FreeBSD.org>
To:        src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org
Subject:   git: 86970ddcc829 - stable/15 - ure: improve checksum offloading
Message-ID:  <69edc32c.2626c.1887e826@gitrepo.freebsd.org>
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The branch stable/15 has been updated by tuexen:

URL: https://cgit.FreeBSD.org/src/commit/?id=86970ddcc829dfc5b00349a4f6c80616bfe1537f

commit 86970ddcc829dfc5b00349a4f6c80616bfe1537f
Author:     Michael Tuexen <tuexen@FreeBSD.org>
AuthorDate: 2026-01-31 10:42:10 +0000
Commit:     Michael Tuexen <tuexen@FreeBSD.org>
CommitDate: 2026-04-26 07:46:25 +0000

    ure: improve checksum offloading
    
    This patch fixes three issues:
    (1) Initially, set the hwassist flags correctly when enabling
        transmit checksum offload for TCP/IPv6 and UDP/IPv6.
    (2) Keep the hwassist flags in sync with the capabilities when
        changing txcsum.
    (3) Keep the hwasssit flags in sync with the capabilities when
        changing txcsum6.
    Without this patch, transmit checksum offloading for TCP/IPv6 and
    UDP/IPv6 is never used and transmit checksum offloading for IPv4,
    TCP/IPv4 and UDP/IPv4 is always used, even if disabled via
    ifconfig ue? -txcsum.
    
    Reviewed by:            Timo Völker
    Differential Revision:  https://reviews.freebsd.org/D54974
    Event:                  Wiesbaden Hackathon 2026
    
    (cherry picked from commit 7b6e84c9ac5668134ab2d075019ef0b827d90c84)
---
 sys/dev/usb/net/if_ure.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/dev/usb/net/if_ure.c b/sys/dev/usb/net/if_ure.c
index c3f7b622d687..3dea88eb10f1 100644
--- a/sys/dev/usb/net/if_ure.c
+++ b/sys/dev/usb/net/if_ure.c
@@ -1015,6 +1015,7 @@ ure_attach_post_sub(struct usb_ether *ue)
 	if_sethwassist(ifp, CSUM_IP|CSUM_IP_UDP|CSUM_IP_TCP);
 #ifdef INET6
 	if_setcapabilitiesbit(ifp, IFCAP_HWCSUM_IPV6, 0);
+	if_sethwassistbits(ifp, CSUM_IP6_UDP|CSUM_IP6_TCP, 0);
 #endif
 	if_setcapenable(ifp, if_getcapabilities(ifp));
 
@@ -1463,6 +1464,7 @@ ure_ioctl(if_t ifp, u_long cmd, caddr_t data)
 		if ((mask & IFCAP_TXCSUM) != 0 &&
 		    (if_getcapabilities(ifp) & IFCAP_TXCSUM) != 0) {
 			if_togglecapenable(ifp, IFCAP_TXCSUM);
+			if_togglehwassist(ifp, CSUM_IP|CSUM_IP_UDP|CSUM_IP_TCP);
 		}
 		if ((mask & IFCAP_RXCSUM) != 0 &&
 		    (if_getcapabilities(ifp) & IFCAP_RXCSUM) != 0) {
@@ -1471,6 +1473,7 @@ ure_ioctl(if_t ifp, u_long cmd, caddr_t data)
 		if ((mask & IFCAP_TXCSUM_IPV6) != 0 &&
 		    (if_getcapabilities(ifp) & IFCAP_TXCSUM_IPV6) != 0) {
 			if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6);
+			if_togglehwassist(ifp, CSUM_IP6_UDP|CSUM_IP6_TCP);
 		}
 		if ((mask & IFCAP_RXCSUM_IPV6) != 0 &&
 		    (if_getcapabilities(ifp) & IFCAP_RXCSUM_IPV6) != 0) {
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