[PATCH v3 4/4] vhost: add device op to offload the interrupt kick

[Thomas Monjalon]

30/05/2023 15:02, Maxime Coquelin:
> 
> On 5/17/23 11:09, Eelco Chaudron wrote:
> > This patch adds an operation callback which gets called every time the
> > library wants to call eventfd_write(). This eventfd_write() call could
> > result in a system call, which could potentially block the PMD thread.
> > 
> > The callback function can decide whether it's ok to handle the
> > eventfd_write() now or have the newly introduced function,
> > rte_vhost_notify_guest(), called at a later time.
> > 
> > This can be used by 3rd party applications, like OVS, to avoid system
> > calls being called as part of the PMD threads.
> > 
> > Signed-off-by: Eelco Chaudron <echaudro at redhat.com>
> > ---
> >   lib/vhost/meson.build |    2 ++
> >   lib/vhost/rte_vhost.h |   23 +++++++++++++++++-
> >   lib/vhost/socket.c    |   63 ++++++++++++++++++++++++++++++++++++++++++++++---
> >   lib/vhost/version.map |    9 +++++++
> >   lib/vhost/vhost.c     |   38 ++++++++++++++++++++++++++++++
> >   lib/vhost/vhost.h     |   58 ++++++++++++++++++++++++++++++++-------------
> >   6 files changed, 171 insertions(+), 22 deletions(-)
> > 
> 
> 
> The patch looks good to me, but that's the first time we use function
> versioning in Vhost library, so I'd like another pair of eyes to be sure
> I don't miss anything.
> 
> Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
> 
> Thomas, do we need to mention it somewhere in the release note?

If compatibility is kept, I think we don't need to mention it.