On Tue, Oct 2, 2018 at 1:01 AM Björn Töpel <bjorn.to...@gmail.com> wrote: > > From: Björn Töpel <bjorn.to...@intel.com> > > This patch adds zero-copy Tx support for AF_XDP sockets. It implements > the ndo_xsk_async_xmit netdev ndo and performs all the Tx logic from a > NAPI context. This means pulling egress packets from the Tx ring, > placing the frames on the NIC HW descriptor ring and completing sent > frames back to the application via the completion ring. > > The regular XDP Tx ring is used for AF_XDP as well. This rationale for > this is as follows: XDP_REDIRECT guarantees mutual exclusion between > different NAPI contexts based on CPU id. In other words, a netdev can > XDP_REDIRECT to another netdev with a different NAPI context, since > the operation is bound to a specific core and each core has its own > hardware ring. > > As the AF_XDP Tx action is running in the same NAPI context and using > the same ring, it will also be protected from XDP_REDIRECT actions > with the exact same mechanism. > > As with AF_XDP Rx, all AF_XDP Tx specific functions are added to > ixgbe_xsk.c. > > Signed-off-by: Björn Töpel <bjorn.to...@intel.com> > ---
Thanks! Tested-by: William Tu <u9012...@gmail.com>
