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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
MFC after:		3 days
Differential Revision:	https://reviews.freebsd.org/D52546
This commit is contained in:
Timo Völker
2025-09-16 23:37:45 +02:00
committed by Michael Tuexen
parent 1bb72d3d6e
commit 5da388d939
1 changed files with 3 additions and 1 deletions
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share/man/man4/vtnet.4
+3 -1
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@@ -22,7 +22,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE. .\" SUCH DAMAGE.
.\" .\"
.Dd September 8, 2025 .Dd September 16, 2025
.Dt VTNET 4 .Dt VTNET 4
.Os .Os
.Sh NAME .Sh NAME
@@ -84,6 +84,8 @@ field of the structure
.Vt struct virtio_net_hdr . .Vt struct virtio_net_hdr .
It also marks the checksum as being correct in the mbuf packet header. It also marks the checksum as being correct in the mbuf packet header.
The default value is 0. 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.tso_disable
.It Va hw.vtnet. Ns Ar X Ns Va .tso_disable .It Va hw.vtnet. Ns Ar X Ns Va .tso_disable
This tunable disables TCP segmentation offloading. This tunable disables TCP segmentation offloading.