On Fri, Feb 28, 2025 at 04:58:49PM +0900, Akihiko Odaki wrote: > Hash reporting > -------------- > > Allow the guest to reuse the hash value to make receive steering > consistent between the host and guest, and to save hash computation. > > RSS > --- Odaki-san, Please reformat the patch description to avoid including "^---$". Git will truncate the commit message at that point, excluding the text below and your Signed-off-by line. > > RSS is a receive steering algorithm that can be negotiated to use with > virtio_net. Conventionally the hash calculation was done by the VMM. > However, computing the hash after the queue was chosen defeats the > purpose of RSS. > > Another approach is to use eBPF steering program. This approach has > another downside: it cannot report the calculated hash due to the > restrictive nature of eBPF steering program. > > Introduce the code to perform RSS to the kernel in order to overcome > thse challenges. An alternative solution is to extend the eBPF steering > program so that it will be able to report to the userspace, but I didn't > opt for it because extending the current mechanism of eBPF steering > program as is because it relies on legacy context rewriting, and > introducing kfunc-based eBPF will result in non-UAPI dependency while > the other relevant virtualization APIs such as KVM and vhost_net are > UAPIs. > > Signed-off-by: Akihiko Odaki <akihiko.odaki@xxxxxxxxxx> > --- This one is ok, as the commit message should end here. > Documentation/networking/tuntap.rst | 7 ++ > drivers/net/Kconfig | 1 + > drivers/net/tap.c | 62 ++++++++++++- > drivers/net/tun.c | 89 ++++++++++++++---- > drivers/net/tun_vnet.h | 180 +++++++++++++++++++++++++++++++++--- > include/linux/if_tap.h | 2 + > include/linux/skbuff.h | 3 + > include/uapi/linux/if_tun.h | 75 +++++++++++++++ > net/core/skbuff.c | 4 + > 9 files changed, 390 insertions(+), 33 deletions(-) ...
