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ixgbe: implement flush flag for ndo_xdp_xmit

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When passed the XDP_XMIT_FLUSH flag ixgbe_xdp_xmit now performs the
same kind of ring tail update as in ixgbe_xdp_flush.  The update tail
code in ixgbe_xdp_flush is generalized and shared with ixgbe_xdp_xmit.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jesper Dangaard Brouer 2018-05-31 10:59:57 +02:00 committed by Alexei Starovoitov
parent cdb57ed07f
commit 5e2e609522
1 changed files with 14 additions and 6 deletions
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20
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
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@ -10022,6 +10022,15 @@ static int ixgbe_xdp(struct net_device *dev, struct netdev_bpf *xdp)
}
}
static void ixgbe_xdp_ring_update_tail(struct ixgbe_ring *ring)
{
/* Force memory writes to complete before letting h/w know there
* are new descriptors to fetch.
*/
wmb();
writel(ring->next_to_use, ring->tail);
}
static int ixgbe_xdp_xmit(struct net_device *dev, int n,
struct xdp_frame **frames, u32 flags)
{
@ -10033,7 +10042,7 @@ static int ixgbe_xdp_xmit(struct net_device *dev, int n,
if (unlikely(test_bit(__IXGBE_DOWN, &adapter->state)))
return -ENETDOWN;
if (unlikely(flags & ~XDP_XMIT_FLAGS_NONE))
if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
return -EINVAL;
/* During program transitions its possible adapter->xdp_prog is assigned
@ -10054,6 +10063,9 @@ static int ixgbe_xdp_xmit(struct net_device *dev, int n,
}
}
if (unlikely(flags & XDP_XMIT_FLUSH))
ixgbe_xdp_ring_update_tail(ring);
return n - drops;
}
@ -10072,11 +10084,7 @@ static void ixgbe_xdp_flush(struct net_device *dev)
if (unlikely(!ring))
return;
/* Force memory writes to complete before letting h/w know there
* are new descriptors to fetch.
*/
wmb();
writel(ring->next_to_use, ring->tail);
ixgbe_xdp_ring_update_tail(ring);
return;
}