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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/drivers/net/xen-netback/common.h
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@@ -48,7 +48,6 @@
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 #include <linux/debugfs.h>
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 typedef unsigned int pending_ring_idx_t;
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-#define INVALID_PENDING_RING_IDX (~0U)
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 struct pending_tx_info {
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 	struct xen_netif_tx_request req; /* tx request */
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@@ -81,8 +80,6 @@
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 /* Discriminate from any valid pending_idx value. */
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 #define INVALID_PENDING_IDX 0xFFFF
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-
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-#define MAX_BUFFER_OFFSET XEN_PAGE_SIZE
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 #define MAX_PENDING_REQS XEN_NETIF_TX_RING_SIZE
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@@ -263,6 +260,22 @@
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 	struct xenvif_hash_cache cache;
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 };
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+struct backend_info {
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+	struct xenbus_device *dev;
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+	struct xenvif *vif;
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+
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+	/* This is the state that will be reflected in xenstore when any
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+	 * active hotplug script completes.
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+	 */
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+	enum xenbus_state state;
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+
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+	enum xenbus_state frontend_state;
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+	struct xenbus_watch hotplug_status_watch;
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+	u8 have_hotplug_status_watch:1;
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+
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+	const char *hotplug_script;
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+};
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+
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 struct xenvif {
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 	/* Unique identifier for this interface. */
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 	domid_t          domid;
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@@ -279,6 +292,9 @@
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 	u8 ip_csum:1;
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 	u8 ipv6_csum:1;
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 	u8 multicast_control:1;
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+
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+	/* headroom requested by xen-netfront */
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+	u16 xdp_headroom;
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 	/* Is this interface disabled? True when backend discovers
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 	 * frontend is rogue.
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@@ -297,6 +313,8 @@
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 	struct xenbus_watch credit_watch;
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 	struct xenbus_watch mcast_ctrl_watch;
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+
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+	struct backend_info *be;
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 	spinlock_t lock;
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@@ -346,11 +364,6 @@
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 int xenvif_xenbus_init(void);
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 void xenvif_xenbus_fini(void);
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-int xenvif_schedulable(struct xenvif *vif);
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-
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-int xenvif_queue_stopped(struct xenvif_queue *queue);
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-void xenvif_wake_queue(struct xenvif_queue *queue);
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-
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 /* (Un)Map communication rings. */
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 void xenvif_unmap_frontend_data_rings(struct xenvif_queue *queue);
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 int xenvif_map_frontend_data_rings(struct xenvif_queue *queue,
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@@ -373,16 +386,12 @@
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 irqreturn_t xenvif_ctrl_irq_fn(int irq, void *data);
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 bool xenvif_have_rx_work(struct xenvif_queue *queue, bool test_kthread);
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-void xenvif_rx_action(struct xenvif_queue *queue);
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-void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb);
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+bool xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb);
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 void xenvif_carrier_on(struct xenvif *vif);
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 /* Callback from stack when TX packet can be released */
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 void xenvif_zerocopy_callback(struct ubuf_info *ubuf, bool zerocopy_success);
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-
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-/* Unmap a pending page and release it back to the guest */
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-void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx);
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 static inline pending_ring_idx_t nr_pending_reqs(struct xenvif_queue *queue)
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 {
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@@ -393,6 +402,7 @@
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 irqreturn_t xenvif_interrupt(int irq, void *dev_id);
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 extern bool separate_tx_rx_irq;
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+extern bool provides_xdp_headroom;
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 extern unsigned int rx_drain_timeout_msecs;
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 extern unsigned int rx_stall_timeout_msecs;