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xen: netif.h: add a new extra type for XDP

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The patch adds a new extra type to be able to diffirentiate
between RX responses on xen-netfront side with the adjusted offset
required for XDP processing.

The offset value from a guest is passed via xenstore.

Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis Kirjanov 2020-06-29 16:13:27 +03:00 committed by David S. Miller
parent 6d79dc6765
commit 2cef30d7bd
1 changed files with 19 additions and 1 deletions
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20
include/xen/interface/io/netif.h
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@ -160,6 +160,19 @@
* be applied if it is set.
*/
/*
* "xdp-headroom" is used to request that extra space is added
* for XDP processing. The value is measured in bytes and passed by
* the frontend to be consistent between both ends.
* If the value is greater than zero that means that
* an RX response is going to be passed to an XDP program for processing.
* XEN_NETIF_MAX_XDP_HEADROOM defines the maximum headroom offset in bytes
*
* "feature-xdp-headroom" is set to "1" by the netback side like other features
* so a guest can check if an XDP program can be processed.
*/
#define XEN_NETIF_MAX_XDP_HEADROOM 0x7FFF
/*
* Control ring
* ============
@ -846,7 +859,8 @@ struct xen_netif_tx_request {
#define XEN_NETIF_EXTRA_TYPE_MCAST_ADD (2) /* u.mcast */
#define XEN_NETIF_EXTRA_TYPE_MCAST_DEL (3) /* u.mcast */
#define XEN_NETIF_EXTRA_TYPE_HASH (4) /* u.hash */
#define XEN_NETIF_EXTRA_TYPE_MAX (5)
#define XEN_NETIF_EXTRA_TYPE_XDP (5) /* u.xdp */
#define XEN_NETIF_EXTRA_TYPE_MAX (6)
/* xen_netif_extra_info_t flags. */
#define _XEN_NETIF_EXTRA_FLAG_MORE (0)
@ -879,6 +893,10 @@ struct xen_netif_extra_info {
uint8_t algorithm;
uint8_t value[4];
} hash;
struct {
uint16_t headroom;
uint16_t pad[2];
} xdp;
uint16_t pad[3];
} u;
};