On Wed, 21 Aug 2019 at 18:22, Ilya Maximets <i.maximets@xxxxxxxxxxx> wrote: > > On 21.08.2019 4:17, Alexander Duyck wrote: > > On Tue, Aug 20, 2019 at 8:58 AM Ilya Maximets <i.maximets@xxxxxxxxxxx> wrote: > >> > >> On 20.08.2019 18:35, Alexander Duyck wrote: [...] > > > > So is it always in the same NAPI context?. I forgot, I was thinking > > that somehow the socket could possibly make use of XDP for transmit. > > AF_XDP socket only triggers tx interrupt on ndo_xsk_async_xmit() which > is used in zero-copy mode. Real xmit happens inside > ixgbe_poll() > -> ixgbe_clean_xdp_tx_irq() > -> ixgbe_xmit_zc() > > This should be not possible to bound another XDP socket to the same netdev > queue. > > It also possible to xmit frames in xdp_ring while performing XDP_TX/REDIRECT > actions. REDIRECT could happen from different netdev with different NAPI > context, but this operation is bound to specific CPU core and each core has > its own xdp_ring. > > However, I'm not an expert here. > Björn, maybe you could comment on this? > Yes, you're correct Ilya.
