On Wed, Jul 3, 2019 at 10:07 AM Paolo Abeni <pab...@redhat.com> wrote:
>
> This series extends ICW usage to one of the few remaining spots in fast-path
> still hitting per packet retpoline overhead, namely the
> sk_proto->{send,recv}msg
> calls.
>
> The first 3 patches in this series refactor the existing code so that applying
> the ICW macros is straight-forward: we demux inet_{recv,send}msg in ipv4 and
> ipv6 variants so that each of them can easily select the appropriate TCP or
> UDP
> direct call. While at it, a new helper is created to avoid excessive code
> duplication, and the current ICWs for inet_{recv,send}msg are adjusted
> accordingly.
>
> The last 2 patches really introduce the new ICW use-case, respectively for the
> ipv6 and the ipv4 code path.
>
> This gives up to 5% performance improvement under UDP flood, and smaller but
> measurable gains for TCP RR workloads.
>
> v1 -> v2:
> - drop inet6_{recv,send}msg declaration from header file,
> prefer ICW macro instead
> - avoid unneeded reclaration for udp_sendmsg, as suggested by Willem
>
> Paolo Abeni (5):
> inet: factor out inet_send_prepare()
> ipv6: provide and use ipv6 specific version for {recv,send}msg
> net: adjust socket level ICW to cope with ipv6 variant of
> {recv,send}msg
> ipv6: use indirect call wrappers for {tcp,udpv6}_{recv,send}msg()
> ipv4: use indirect call wrappers for {tcp,udp}_{recv,send}msg()
Acked-by: Willem de Bruijn <will...@google.com>
