1 /******************************************************************************
2 * arch/xen/drivers/netif/backend/common.h
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License version 2
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29 #ifndef __NETIF__BACKEND__COMMON_H__
30 #define __NETIF__BACKEND__COMMON_H__
32 #include <linux/version.h>
33 #include <linux/module.h>
34 #include <linux/interrupt.h>
35 #include <linux/slab.h>
38 #include <linux/netdevice.h>
39 #include <linux/etherdevice.h>
40 #include <linux/wait.h>
41 #include <xen/evtchn.h>
42 #include <xen/interface/io/netif.h>
44 #include <asm/pgalloc.h>
45 #include <xen/interface/grant_table.h>
46 #include <xen/gnttab.h>
47 #include <xen/driver_util.h>
48 #include <xen/xenbus.h>
50 #define DPRINTK(_f, _a...) \
51 pr_debug("(file=%s, line=%d) " _f, \
52 __FILE__ , __LINE__ , ## _a )
53 #define IPRINTK(fmt, args...) \
54 printk(KERN_INFO "xen_net: " fmt, ##args)
55 #define WPRINTK(fmt, args...) \
56 printk(KERN_WARNING "xen_net: " fmt, ##args)
58 typedef struct netif_st {
59 /* Unique identifier for this interface. */
65 /* Physical parameters of the comms window. */
66 grant_handle_t tx_shmem_handle;
67 grant_ref_t tx_shmem_ref;
68 grant_handle_t rx_shmem_handle;
69 grant_ref_t rx_shmem_ref;
72 /* The shared rings and indexes. */
73 netif_tx_back_ring_t tx;
74 netif_rx_back_ring_t rx;
75 struct vm_struct *tx_comms_area;
76 struct vm_struct *rx_comms_area;
78 /* Set of features that can be turned on in dev->features. */
81 /* Internal feature information. */
82 u8 can_queue:1; /* can queue packets for receiver? */
83 u8 copying_receiver:1; /* copy packets to receiver? */
85 /* Allow netif_be_start_xmit() to peek ahead in the rx request ring. */
86 RING_IDX rx_req_cons_peek;
88 /* Transmit shaping: allow 'credit_bytes' every 'credit_usec'. */
89 unsigned long credit_bytes;
90 unsigned long credit_usec;
91 unsigned long remaining_credit;
92 struct timer_list credit_timeout;
94 /* Enforce draining of the transmit queue. */
95 struct timer_list tx_queue_timeout;
100 /* Miscellaneous private stuff. */
101 struct list_head list; /* scheduling list */
103 struct net_device *dev;
104 struct net_device_stats stats;
106 unsigned int carrier;
108 wait_queue_head_t waiting_to_free;
112 * Implement our own carrier flag: the network stack's version causes delays
113 * when the carrier is re-enabled (in particular, dev_activate() may not
114 * immediately be called, which can cause packet loss; also the etherbridge
115 * can be rather lazy in activating its port).
117 #define netback_carrier_on(netif) ((netif)->carrier = 1)
118 #define netback_carrier_off(netif) ((netif)->carrier = 0)
119 #define netback_carrier_ok(netif) ((netif)->carrier)
123 NETBK_DELAYED_COPY_SKB,
124 NETBK_ALWAYS_COPY_SKB,
127 extern int netbk_copy_skb_mode;
129 /* Function pointers into netback accelerator plugin modules */
130 struct netback_accel_hooks {
131 struct module *owner;
132 int (*probe)(struct xenbus_device *dev);
133 int (*remove)(struct xenbus_device *dev);
136 /* Structure to track the state of a netback accelerator plugin */
137 struct netback_accelerator {
138 struct list_head link;
142 struct netback_accel_hooks *hooks;
145 struct backend_info {
146 struct xenbus_device *dev;
148 enum xenbus_state frontend_state;
150 /* State relating to the netback accelerator */
151 void *netback_accel_priv;
152 /* The accelerator that this backend is currently using */
153 struct netback_accelerator *accelerator;
156 #define NETBACK_ACCEL_VERSION 0x00010001
159 * Connect an accelerator plugin module to netback. Returns zero on
160 * success, < 0 on error, > 0 (with highest version number supported)
161 * if version mismatch.
163 extern int netback_connect_accelerator(unsigned version,
164 int id, const char *eth_name,
165 struct netback_accel_hooks *hooks);
166 /* Disconnect a previously connected accelerator plugin module */
167 extern void netback_disconnect_accelerator(int id, const char *eth_name);
171 void netback_probe_accelerators(struct backend_info *be,
172 struct xenbus_device *dev);
174 void netback_remove_accelerators(struct backend_info *be,
175 struct xenbus_device *dev);
177 void netif_accel_init(void);
180 #define NET_TX_RING_SIZE __RING_SIZE((netif_tx_sring_t *)0, PAGE_SIZE)
181 #define NET_RX_RING_SIZE __RING_SIZE((netif_rx_sring_t *)0, PAGE_SIZE)
183 void netif_disconnect(netif_t *netif);
185 netif_t *netif_alloc(struct device *parent, domid_t domid, unsigned int handle);
186 int netif_map(netif_t *netif, unsigned long tx_ring_ref,
187 unsigned long rx_ring_ref, unsigned int evtchn);
189 #define netif_get(_b) (atomic_inc(&(_b)->refcnt))
190 #define netif_put(_b) \
192 if ( atomic_dec_and_test(&(_b)->refcnt) ) \
193 wake_up(&(_b)->waiting_to_free); \
196 void netif_xenbus_init(void);
198 #define netif_schedulable(netif) \
199 (netif_running((netif)->dev) && netback_carrier_ok(netif))
201 void netif_schedule_work(netif_t *netif);
202 void netif_deschedule_work(netif_t *netif);
204 int netif_be_start_xmit(struct sk_buff *skb, struct net_device *dev);
205 struct net_device_stats *netif_be_get_stats(struct net_device *dev);
206 irqreturn_t netif_be_int(int irq, void *dev_id);
208 static inline int netbk_can_queue(struct net_device *dev)
210 netif_t *netif = netdev_priv(dev);
211 return netif->can_queue;
214 static inline int netbk_can_sg(struct net_device *dev)
216 netif_t *netif = netdev_priv(dev);
217 return netif->features & NETIF_F_SG;
220 #endif /* __NETIF__BACKEND__COMMON_H__ */