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Date: Thu, 31 May 2018 10:47:39 +0200 From: Jesper Dangaard Brouer <brouer@...hat.com> To: Song Liu <liu.song.a23@...il.com> Cc: Networking <netdev@...r.kernel.org>, Daniel Borkmann <borkmann@...earbox.net>, Alexei Starovoitov <alexei.starovoitov@...il.com>, John Fastabend <john.fastabend@...il.com>, makita.toshiaki@....ntt.co.jp, brouer@...hat.com Subject: Re: [bpf-next V1 PATCH 2/8] i40e: implement flush flag for ndo_xdp_xmit On Wed, 30 May 2018 14:58:16 -0700 Song Liu <liu.song.a23@...il.com> wrote: > > @@ -3699,6 +3699,9 @@ int i40e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames, > > } > > } > > > > + if (unlikely(flags & XDP_XMIT_FLUSH)) > > + i40e_xdp_ring_update_tail(vsi->xdp_rings[queue_index]); > > + > > return n - drops; > > Do we still flush when drops > 0? Yes, just as before. Even if all frames are dropped, then it's allowed to update the tail. -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer
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