This series is mainly adding support for RSS to Virtio PMD driver. The two last patches are fixing an issue in testpmd that prevents to configure the RSS hash types, and fix an issue spotted in the mlx5 driver while looking for inspiration.
The first motivation for this series is to eventually support RSS down to the Vhost-user library, so that OVS can benefit from it. But it will be also useful with vDPA devices in the future. Regarding the testing, I have tested it with qemu v5.2 from Fedora 34. Since libvirt does not support yet enabling RSS feature in the Qemu virtio-net device, and this feature is disabled by default, the tester can either rebuild the qemu package to enable it by default or use the qemu cmdline to do the same. The tester can use testpmd in icmpecho mode in the guest and scapy on the host to inject random traffic on the tap interface, e.g.: sendp(Ether(src=RandMAC()) / IP(src=RandIP(), dst='192.168.123.9') / UDP(sport=RandShort(), dport=RandShort()), loop=True, iface='vnet7') Then it can play with RSS config in testpmd to change the reta, or hash type and see traffic being steered accordingly by checking the Rx xstats. Ferruh, Andrew, I have updated the driver feature list, but I have one doubt about whether I should set RSS hash, since the driver don't support hash reporting yet, but the device performs RSS hashing for queue selection. WDYT? Maxime Coquelin (3): net/virtio: add initial RSS support app/testpmd: fix RSS hash type update net/mlx5: Fix RSS RETA update app/test-pmd/config.c | 8 +- doc/guides/nics/features/virtio.ini | 2 + doc/guides/nics/virtio.rst | 3 + doc/guides/rel_notes/release_21_11.rst | 5 + drivers/net/mlx5/mlx5_rss.c | 2 +- drivers/net/virtio/virtio.h | 31 ++- drivers/net/virtio/virtio_ethdev.c | 367 ++++++++++++++++++++++++- drivers/net/virtio/virtio_ethdev.h | 3 +- drivers/net/virtio/virtqueue.h | 21 ++ 9 files changed, 429 insertions(+), 13 deletions(-) -- 2.31.1
