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27 #ifndef __XEN_NETBACK__COMMON_H__
28 #define __XEN_NETBACK__COMMON_H__
30 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
32 #include <linux/module.h>
33 #include <linux/interrupt.h>
34 #include <linux/slab.h>
38 #include <linux/netdevice.h>
39 #include <linux/etherdevice.h>
40 #include <linux/wait.h>
41 #include <linux/sched.h>
43 #include <xen/interface/io/netif.h>
44 #include <xen/interface/grant_table.h>
45 #include <xen/grant_table.h>
46 #include <xen/xenbus.h>
51 /* Unique identifier for this interface. */
55 /* Reference to netback processing backend. */
56 struct xen_netbk *netbk;
60 /* Physical parameters of the comms window. */
63 /* List of frontends to notify after a batch of frames sent. */
64 struct list_head notify_list;
66 /* The shared rings and indexes. */
67 struct xen_netif_tx_back_ring tx;
68 struct xen_netif_rx_back_ring rx;
70 /* Frontend feature information. */
76 /* Internal feature information. */
77 u8 can_queue:1; /* can queue packets for receiver? */
80 * Allow xenvif_start_xmit() to peek ahead in the rx request
81 * ring. This is a prediction of what rx_req_cons will be
82 * once all queued skbs are put on the ring.
84 RING_IDX rx_req_cons_peek;
86 /* Transmit shaping: allow 'credit_bytes' every 'credit_usec'. */
87 unsigned long credit_bytes;
88 unsigned long credit_usec;
89 unsigned long remaining_credit;
90 struct timer_list credit_timeout;
91 u64 credit_window_start;
94 unsigned long rx_gso_checksum_fixup;
96 /* Miscellaneous private stuff. */
97 struct list_head schedule_list;
99 struct net_device *dev;
101 wait_queue_head_t waiting_to_free;
104 static inline struct xenbus_device *xenvif_to_xenbus_device(struct xenvif *vif)
106 return to_xenbus_device(vif->dev->dev.parent);
109 #define XEN_NETIF_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE)
110 #define XEN_NETIF_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE)
112 struct xenvif *xenvif_alloc(struct device *parent,
114 unsigned int handle);
116 int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
117 unsigned long rx_ring_ref, unsigned int evtchn);
118 void xenvif_disconnect(struct xenvif *vif);
119 void xenvif_free(struct xenvif *vif);
121 void xenvif_get(struct xenvif *vif);
122 void xenvif_put(struct xenvif *vif);
124 int xenvif_xenbus_init(void);
126 int xenvif_schedulable(struct xenvif *vif);
128 int xen_netbk_rx_ring_full(struct xenvif *vif);
130 int xen_netbk_must_stop_queue(struct xenvif *vif);
132 /* (Un)Map communication rings. */
133 void xen_netbk_unmap_frontend_rings(struct xenvif *vif);
134 int xen_netbk_map_frontend_rings(struct xenvif *vif,
135 grant_ref_t tx_ring_ref,
136 grant_ref_t rx_ring_ref);
138 /* (De)Register a xenvif with the netback backend. */
139 void xen_netbk_add_xenvif(struct xenvif *vif);
140 void xen_netbk_remove_xenvif(struct xenvif *vif);
142 /* (De)Schedule backend processing for a xenvif */
143 void xen_netbk_schedule_xenvif(struct xenvif *vif);
144 void xen_netbk_deschedule_xenvif(struct xenvif *vif);
146 /* Check for SKBs from frontend and schedule backend processing */
147 void xen_netbk_check_rx_xenvif(struct xenvif *vif);
148 /* Receive an SKB from the frontend */
149 void xenvif_receive_skb(struct xenvif *vif, struct sk_buff *skb);
151 /* Queue an SKB for transmission to the frontend */
152 void xen_netbk_queue_tx_skb(struct xenvif *vif, struct sk_buff *skb);
153 /* Notify xenvif that ring now has space to send an skb to the frontend */
154 void xenvif_notify_tx_completion(struct xenvif *vif);
156 /* Prevent the device from generating any further traffic. */
157 void xenvif_carrier_off(struct xenvif *vif);
159 /* Returns number of ring slots required to send an skb to the frontend */
160 unsigned int xen_netbk_count_skb_slots(struct xenvif *vif, struct sk_buff *skb);
162 #endif /* __XEN_NETBACK__COMMON_H__ */