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-rw-r--r--drivers/net/xen-netback/common.h161
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diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
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1/*
2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License version 2
4 * as published by the Free Software Foundation; or, when distributed
5 * separately from the Linux kernel or incorporated into other
6 * software packages, subject to the following license:
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this source file (the "Software"), to deal in the Software without
10 * restriction, including without limitation the rights to use, copy, modify,
11 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
12 * and to permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * IN THE SOFTWARE.
25 */
26
27#ifndef __XEN_NETBACK__COMMON_H__
28#define __XEN_NETBACK__COMMON_H__
29
30#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
31
32#include <linux/module.h>
33#include <linux/interrupt.h>
34#include <linux/slab.h>
35#include <linux/ip.h>
36#include <linux/in.h>
37#include <linux/io.h>
38#include <linux/netdevice.h>
39#include <linux/etherdevice.h>
40#include <linux/wait.h>
41#include <linux/sched.h>
42
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>
47
48struct xen_netbk;
49
50struct xenvif {
51 /* Unique identifier for this interface. */
52 domid_t domid;
53 unsigned int handle;
54
55 /* Reference to netback processing backend. */
56 struct xen_netbk *netbk;
57
58 u8 fe_dev_addr[6];
59
60 /* Physical parameters of the comms window. */
61 grant_handle_t tx_shmem_handle;
62 grant_ref_t tx_shmem_ref;
63 grant_handle_t rx_shmem_handle;
64 grant_ref_t rx_shmem_ref;
65 unsigned int irq;
66
67 /* List of frontends to notify after a batch of frames sent. */
68 struct list_head notify_list;
69
70 /* The shared rings and indexes. */
71 struct xen_netif_tx_back_ring tx;
72 struct xen_netif_rx_back_ring rx;
73 struct vm_struct *tx_comms_area;
74 struct vm_struct *rx_comms_area;
75
76 /* Flags that must not be set in dev->features */
77 u32 features_disabled;
78
79 /* Frontend feature information. */
80 u8 can_sg:1;
81 u8 gso:1;
82 u8 gso_prefix:1;
83 u8 csum:1;
84
85 /* Internal feature information. */
86 u8 can_queue:1; /* can queue packets for receiver? */
87
88 /*
89 * Allow xenvif_start_xmit() to peek ahead in the rx request
90 * ring. This is a prediction of what rx_req_cons will be
91 * once all queued skbs are put on the ring.
92 */
93 RING_IDX rx_req_cons_peek;
94
95 /* Transmit shaping: allow 'credit_bytes' every 'credit_usec'. */
96 unsigned long credit_bytes;
97 unsigned long credit_usec;
98 unsigned long remaining_credit;
99 struct timer_list credit_timeout;
100
101 /* Statistics */
102 unsigned long rx_gso_checksum_fixup;
103
104 /* Miscellaneous private stuff. */
105 struct list_head schedule_list;
106 atomic_t refcnt;
107 struct net_device *dev;
108
109 wait_queue_head_t waiting_to_free;
110};
111
112#define XEN_NETIF_TX_RING_SIZE __RING_SIZE((struct xen_netif_tx_sring *)0, PAGE_SIZE)
113#define XEN_NETIF_RX_RING_SIZE __RING_SIZE((struct xen_netif_rx_sring *)0, PAGE_SIZE)
114
115struct xenvif *xenvif_alloc(struct device *parent,
116 domid_t domid,
117 unsigned int handle);
118
119int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
120 unsigned long rx_ring_ref, unsigned int evtchn);
121void xenvif_disconnect(struct xenvif *vif);
122
123void xenvif_get(struct xenvif *vif);
124void xenvif_put(struct xenvif *vif);
125
126int xenvif_xenbus_init(void);
127
128int xenvif_schedulable(struct xenvif *vif);
129
130int xen_netbk_rx_ring_full(struct xenvif *vif);
131
132int xen_netbk_must_stop_queue(struct xenvif *vif);
133
134/* (Un)Map communication rings. */
135void xen_netbk_unmap_frontend_rings(struct xenvif *vif);
136int xen_netbk_map_frontend_rings(struct xenvif *vif,
137 grant_ref_t tx_ring_ref,
138 grant_ref_t rx_ring_ref);
139
140/* (De)Register a xenvif with the netback backend. */
141void xen_netbk_add_xenvif(struct xenvif *vif);
142void xen_netbk_remove_xenvif(struct xenvif *vif);
143
144/* (De)Schedule backend processing for a xenvif */
145void xen_netbk_schedule_xenvif(struct xenvif *vif);
146void xen_netbk_deschedule_xenvif(struct xenvif *vif);
147
148/* Check for SKBs from frontend and schedule backend processing */
149void xen_netbk_check_rx_xenvif(struct xenvif *vif);
150/* Receive an SKB from the frontend */
151void xenvif_receive_skb(struct xenvif *vif, struct sk_buff *skb);
152
153/* Queue an SKB for transmission to the frontend */
154void xen_netbk_queue_tx_skb(struct xenvif *vif, struct sk_buff *skb);
155/* Notify xenvif that ring now has space to send an skb to the frontend */
156void xenvif_notify_tx_completion(struct xenvif *vif);
157
158/* Returns number of ring slots required to send an skb to the frontend */
159unsigned int xen_netbk_count_skb_slots(struct xenvif *vif, struct sk_buff *skb);
160
161#endif /* __XEN_NETBACK__COMMON_H__ */
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-08 16:35:02 -0500