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vtnet: deprecate loader tunable fixup_needs_csum

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If this tunable is enabled and vtnet receives a packet with
VIRTIO_NET_HDR_F_NEEDS_CSUM set, vtnet computes the TCP/UDP checksum
and writes it in the checksum field.
This was somewhat useful when vtnet pretended that such a packet has
a correct checksum and set the mbuf flag CSUM_DATA_VALID.
But this is not the case anymore.

Reviewed by:		tuexen
Differential Revision:	https://reviews.freebsd.org/D52546

(cherry picked from commit 5da388d93917f5fa74022960cc65452592f71539)
This commit is contained in:
Timo Völker 2025-09-16 23:37:45 +02:00 committed by Franco Fichtner
parent d92ff32bad
commit 4ac0fb6ca4
1 changed files with 3 additions and 1 deletions
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4
share/man/man4/vtnet.4
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@ -22,7 +22,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd September 8, 2025
.Dd September 16, 2025
.Dt VTNET 4
.Os
.Sh NAME
@ -84,6 +84,8 @@ field of the structure
.Vt struct virtio_net_hdr .
It also marks the checksum as being correct in the mbuf packet header.
The default value is 0.
This tunable is deprecated and will be removed in
.Fx 16 .
.It Va hw.vtnet.tso_disable
.It Va hw.vtnet. Ns Ar X Ns Va .tso_disable
This tunable disables TCP segmentation offloading.