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i40e: implement flush flag for ndo_xdp_xmit

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When passed the XDP_XMIT_FLUSH flag i40e_xdp_xmit now performs the
same kind of ring tail update as in i40e_xdp_flush.  The advantage is
that all the necessary checks have been performed and xdp_ring can be
updated, instead of having to perform the exact same steps/checks in
i40e_xdp_flush

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jesper Dangaard Brouer 2018-05-31 10:59:52 +02:00 committed by Alexei Starovoitov
parent 42b3346898
commit cdb57ed07f
1 changed files with 8 additions and 2 deletions
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10
drivers/net/ethernet/intel/i40e/i40e_txrx.c
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@ -3676,6 +3676,7 @@ int i40e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
struct i40e_netdev_priv *np = netdev_priv(dev);
unsigned int queue_index = smp_processor_id();
struct i40e_vsi *vsi = np->vsi;
struct i40e_ring *xdp_ring;
int drops = 0;
int i;
@ -3685,20 +3686,25 @@ int i40e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
if (!i40e_enabled_xdp_vsi(vsi) || queue_index >= vsi->num_queue_pairs)
return -ENXIO;
if (unlikely(flags & ~XDP_XMIT_FLAGS_NONE))
if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
return -EINVAL;
xdp_ring = vsi->xdp_rings[queue_index];
for (i = 0; i < n; i++) {
struct xdp_frame *xdpf = frames[i];
int err;
err = i40e_xmit_xdp_ring(xdpf, vsi->xdp_rings[queue_index]);
err = i40e_xmit_xdp_ring(xdpf, xdp_ring);
if (err != I40E_XDP_TX) {
xdp_return_frame_rx_napi(xdpf);
drops++;
}
}
if (unlikely(flags & XDP_XMIT_FLUSH))
i40e_xdp_ring_update_tail(xdp_ring);
return n - drops;
}