ia64/xen-unstable

view linux-2.6-xen-sparse/drivers/xen/netback/common.h @ 14290:42b29f084c31

linux: Use fake carrier flag for netfront/netback rather than the real
netif_carrier_XXX() functions. This makes network bringup much faster.
Signed-off-by: Keir Fraser <keir@xensource.com>
author kfraser@localhost.localdomain
date Wed Mar 07 16:00:47 2007 +0000 (2007-03-07)
parents e47738923a05
children c4f62fe631e4
line source
1 /******************************************************************************
2 * arch/xen/drivers/netif/backend/common.h
3 *
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
6 * as published by the Free Software Foundation; or, when distributed
7 * separately from the Linux kernel or incorporated into other
8 * software packages, subject to the following license:
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this source file (the "Software"), to deal in the Software without
12 * restriction, including without limitation the rights to use, copy, modify,
13 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
14 * and to permit persons to whom the Software is furnished to do so, subject to
15 * the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
26 * IN THE SOFTWARE.
27 */
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>
36 #include <linux/ip.h>
37 #include <linux/in.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>
43 #include <asm/io.h>
44 #include <asm/pgalloc.h>
45 #include <xen/interface/grant_table.h>
46 #include <xen/gnttab.h>
47 #include <xen/driver_util.h>
49 #define DPRINTK(_f, _a...) \
50 pr_debug("(file=%s, line=%d) " _f, \
51 __FILE__ , __LINE__ , ## _a )
52 #define IPRINTK(fmt, args...) \
53 printk(KERN_INFO "xen_net: " fmt, ##args)
54 #define WPRINTK(fmt, args...) \
55 printk(KERN_WARNING "xen_net: " fmt, ##args)
57 typedef struct netif_st {
58 /* Unique identifier for this interface. */
59 domid_t domid;
60 unsigned int handle;
62 u8 fe_dev_addr[6];
64 /* Physical parameters of the comms window. */
65 grant_handle_t tx_shmem_handle;
66 grant_ref_t tx_shmem_ref;
67 grant_handle_t rx_shmem_handle;
68 grant_ref_t rx_shmem_ref;
69 unsigned int irq;
71 /* The shared rings and indexes. */
72 netif_tx_back_ring_t tx;
73 netif_rx_back_ring_t rx;
74 struct vm_struct *tx_comms_area;
75 struct vm_struct *rx_comms_area;
77 /* Set of features that can be turned on in dev->features. */
78 int features;
80 /* Internal feature information. */
81 int can_queue:1; /* can queue packets for receiver? */
82 int copying_receiver:1; /* copy packets to receiver? */
84 /* Allow netif_be_start_xmit() to peek ahead in the rx request ring. */
85 RING_IDX rx_req_cons_peek;
87 /* Transmit shaping: allow 'credit_bytes' every 'credit_usec'. */
88 unsigned long credit_bytes;
89 unsigned long credit_usec;
90 unsigned long remaining_credit;
91 struct timer_list credit_timeout;
93 /* Enforce draining of the transmit queue. */
94 struct timer_list tx_queue_timeout;
96 /* Miscellaneous private stuff. */
97 struct list_head list; /* scheduling list */
98 atomic_t refcnt;
99 struct net_device *dev;
100 struct net_device_stats stats;
102 unsigned int carrier;
104 wait_queue_head_t waiting_to_free;
105 } netif_t;
107 /*
108 * Implement our own carrier flag: the network stack's version causes delays
109 * when the carrier is re-enabled (in particular, dev_activate() may not
110 * immediately be called, which can cause packet loss; also the etherbridge
111 * can be rather lazy in activating its port).
112 */
113 #define netback_carrier_on(netif) ((netif)->carrier = 1)
114 #define netback_carrier_off(netif) ((netif)->carrier = 0)
115 #define netback_carrier_ok(netif) ((netif)->carrier)
117 #define NET_TX_RING_SIZE __RING_SIZE((netif_tx_sring_t *)0, PAGE_SIZE)
118 #define NET_RX_RING_SIZE __RING_SIZE((netif_rx_sring_t *)0, PAGE_SIZE)
120 void netif_disconnect(netif_t *netif);
122 netif_t *netif_alloc(domid_t domid, unsigned int handle);
123 int netif_map(netif_t *netif, unsigned long tx_ring_ref,
124 unsigned long rx_ring_ref, unsigned int evtchn);
126 #define netif_get(_b) (atomic_inc(&(_b)->refcnt))
127 #define netif_put(_b) \
128 do { \
129 if ( atomic_dec_and_test(&(_b)->refcnt) ) \
130 wake_up(&(_b)->waiting_to_free); \
131 } while (0)
133 void netif_xenbus_init(void);
135 #define netif_schedulable(netif) \
136 (netif_running((netif)->dev) && netback_carrier_ok(netif))
138 void netif_schedule_work(netif_t *netif);
139 void netif_deschedule_work(netif_t *netif);
141 int netif_be_start_xmit(struct sk_buff *skb, struct net_device *dev);
142 struct net_device_stats *netif_be_get_stats(struct net_device *dev);
143 irqreturn_t netif_be_int(int irq, void *dev_id, struct pt_regs *regs);
145 static inline int netbk_can_queue(struct net_device *dev)
146 {
147 netif_t *netif = netdev_priv(dev);
148 return netif->can_queue;
149 }
151 static inline int netbk_can_sg(struct net_device *dev)
152 {
153 netif_t *netif = netdev_priv(dev);
154 return netif->features & NETIF_F_SG;
155 }
157 #endif /* __NETIF__BACKEND__COMMON_H__ */