xen: netif.h: add a new extra type for XDP
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>
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@ -160,6 +160,19 @@
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* be applied if it is set.
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*/
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/*
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* "xdp-headroom" is used to request that extra space is added
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* for XDP processing. The value is measured in bytes and passed by
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* the frontend to be consistent between both ends.
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* If the value is greater than zero that means that
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* an RX response is going to be passed to an XDP program for processing.
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* XEN_NETIF_MAX_XDP_HEADROOM defines the maximum headroom offset in bytes
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*
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* "feature-xdp-headroom" is set to "1" by the netback side like other features
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* so a guest can check if an XDP program can be processed.
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*/
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#define XEN_NETIF_MAX_XDP_HEADROOM 0x7FFF
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/*
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* Control ring
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* ============
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@ -846,7 +859,8 @@ struct xen_netif_tx_request {
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#define XEN_NETIF_EXTRA_TYPE_MCAST_ADD (2) /* u.mcast */
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#define XEN_NETIF_EXTRA_TYPE_MCAST_DEL (3) /* u.mcast */
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#define XEN_NETIF_EXTRA_TYPE_HASH (4) /* u.hash */
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#define XEN_NETIF_EXTRA_TYPE_MAX (5)
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#define XEN_NETIF_EXTRA_TYPE_XDP (5) /* u.xdp */
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#define XEN_NETIF_EXTRA_TYPE_MAX (6)
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/* xen_netif_extra_info_t flags. */
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#define _XEN_NETIF_EXTRA_FLAG_MORE (0)
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@ -879,6 +893,10 @@ struct xen_netif_extra_info {
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uint8_t algorithm;
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uint8_t value[4];
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} hash;
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struct {
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uint16_t headroom;
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uint16_t pad[2];
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} xdp;
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uint16_t pad[3];
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} u;
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};
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