This series adds adjust head support for virtio. The following is my
test setup. I use qemu + virtio as follows,
./x86_64-softmmu/qemu-system-x86_64 \
-hda /var/lib/libvirt/images/Fedora-test0.img \
-m 4096 -enable-kvm -smp 2 -netdev tap,id=hn0,queues=4,vhost=on \
-device
virtio-net-pci,netdev=hn0,mq=on,guest_tso4=off,guest_tso6=off,guest_ecn=off,guest_ufo=off,vectors=9
In order to use XDP with virtio until LRO is supported TSO must be
turned off in the host. The important fields in the above command line
are the following,
guest_tso4=off,guest_tso6=off,guest_ecn=off,guest_ufo=off
Also note it is possible to conusme more queues than can be supported
because when XDP is enabled for retransmit XDP attempts to use a queue
per cpu. My standard queue count is 'queues=4'.
After loading the VM I run the relevant XDP test programs in,
./sammples/bpf
For this series I tested xdp1, xdp2, and xdp_tx_iptunnel. I usually test
with iperf (-d option to get bidirectional traffic), ping, and pktgen.
I also have a modified xdp1 that returns XDP_PASS on any packet to ensure
the normal traffic path to the stack continues to work with XDP loaded.
It would be great to automate this soon. At the moment I do it by hand
which is starting to get tedious.
v2: original series dropped trace points after merge.
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John Fastabend (5):
virtio_net: wrap rtnl_lock in test for calling with lock already held
virtio_net: factor out xdp handler for readability
virtio_net: remove duplicate queue pair binding in XDP
virtio_net: refactor freeze/restore logic into virtnet reset logic
virtio_net: XDP support for adjust_head
drivers/net/virtio_net.c | 338 ++++++++++++++++++++++++++++++----------------
drivers/virtio/virtio.c | 42 +++---
include/linux/virtio.h | 4 +
3 files changed, 247 insertions(+), 137 deletions(-)
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