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Jason Wang 97b2409f28 vhost-net: reduce one userspace copy when building XDP buff

We used to do twice copy_from_iter() to copy virtio-net and packet
separately. This introduce overheads for userspace access hardening as
well as SMAP (for x86 it's stac/clac). So this patch tries to use one
copy_from_iter() to copy them once and move the virtio-net header
afterwards to reduce overheads.

Testpmd + vhost_net shows 10% improvement from 5.45Mpps to 6.0Mpps.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://patch.msgid.link/20250701010352.74515-2-jasowang@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2025-07-02 15:29:46 -07:00

iotlb.c

vhost_iotlb: split out IOTLB initialization

2022-05-31 12:44:28 -04:00

Kconfig

vhost-scsi: Dynamically allocate scatterlists

2025-02-25 07:10:46 -05:00

Makefile

vhost: introduce vDPA-based backend

2020-04-02 10:41:40 -04:00

net.c

vhost-net: reduce one userspace copy when building XDP buff