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xdp: Add batching support to redirect map

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For performance reasons we want to avoid updating the tail pointer in
the driver tx ring as much as possible. To accomplish this we add
batching support to the redirect path in XDP.

This adds another ndo op "xdp_flush" that is used to inform the driver
that it should bump the tail pointer on the TX ring.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend
2017-07-17 09:29:40 -07:00
committed by David S. Miller
parent 97f91a7cf0
commit 11393cc9b9
6 changed files with 166 additions and 15 deletions
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5
include/linux/netdevice.h
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@@ -1142,7 +1142,9 @@ struct xfrmdev_ops {
* int (*ndo_xdp_xmit)(struct net_device *dev, struct xdp_buff *xdp);
* This function is used to submit a XDP packet for transmit on a
* netdevice.
*
* void (*ndo_xdp_flush)(struct net_device *dev);
* This function is used to inform the driver to flush a paticular
* xpd tx queue. Must be called on same CPU as xdp_xmit.
*/
struct net_device_ops {
int (*ndo_init)(struct net_device *dev);
@@ -1329,6 +1331,7 @@ struct net_device_ops {
struct netdev_xdp *xdp);
int (*ndo_xdp_xmit)(struct net_device *dev,
struct xdp_buff *xdp);
void (*ndo_xdp_flush)(struct net_device *dev);
};
/**