[net-next-2.6.git] / drivers / net / cxgb4 / l2t.h

/*
 * This file is part of the Chelsio T4 Ethernet driver for Linux.
 *
 * Copyright (c) 2003-2010 Chelsio Communications, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef __CXGB4_L2T_H
#define __CXGB4_L2T_H

#include <linux/spinlock.h>
#include <linux/if_ether.h>
#include <asm/atomic.h>

struct adapter;
struct l2t_data;
struct neighbour;
struct net_device;
struct file_operations;
struct cpl_l2t_write_rpl;

/*
 * Each L2T entry plays multiple roles.  First of all, it keeps state for the
 * corresponding entry of the HW L2 table and maintains a queue of offload
 * packets awaiting address resolution.  Second, it is a node of a hash table
 * chain, where the nodes of the chain are linked together through their next
 * pointer.  Finally, each node is a bucket of a hash table, pointing to the
 * first element in its chain through its first pointer.
 */
struct l2t_entry {
	u16 state;                  /* entry state */
	u16 idx;                    /* entry index */
	u32 addr[4];                /* next hop IP or IPv6 address */
	int ifindex;                /* neighbor's net_device's ifindex */
	struct neighbour *neigh;    /* associated neighbour */
	struct l2t_entry *first;    /* start of hash chain */
	struct l2t_entry *next;     /* next l2t_entry on chain */
	struct sk_buff *arpq_head;  /* queue of packets awaiting resolution */
	struct sk_buff *arpq_tail;
	spinlock_t lock;
	atomic_t refcnt;            /* entry reference count */
	u16 hash;                   /* hash bucket the entry is on */
	u16 vlan;                   /* VLAN TCI (id: bits 0-11, prio: 13-15 */
	u8 v6;                      /* whether entry is for IPv6 */
	u8 lport;                   /* associated offload logical interface */
	u8 dmac[ETH_ALEN];          /* neighbour's MAC address */
};

typedef void (*arp_err_handler_t)(void *handle, struct sk_buff *skb);

/*
 * Callback stored in an skb to handle address resolution failure.
 */
struct l2t_skb_cb {
	void *handle;
	arp_err_handler_t arp_err_handler;
};

#define L2T_SKB_CB(skb) ((struct l2t_skb_cb *)(skb)->cb)

static inline void t4_set_arp_err_handler(struct sk_buff *skb, void *handle,
					  arp_err_handler_t handler)
{
	L2T_SKB_CB(skb)->handle = handle;
	L2T_SKB_CB(skb)->arp_err_handler = handler;
}

void cxgb4_l2t_release(struct l2t_entry *e);
int cxgb4_l2t_send(struct net_device *dev, struct sk_buff *skb,
		   struct l2t_entry *e);
struct l2t_entry *cxgb4_l2t_get(struct l2t_data *d, struct neighbour *neigh,
				const struct net_device *physdev,
				unsigned int priority);

void t4_l2t_update(struct adapter *adap, struct neighbour *neigh);
struct l2t_data *t4_init_l2t(void);
void do_l2t_write_rpl(struct adapter *p, const struct cpl_l2t_write_rpl *rpl);

extern const struct file_operations t4_l2t_fops;
#endif  /* __CXGB4_L2T_H */
Commit	Line	Data
625ba2c2 DM	1	/*
	2	* This file is part of the Chelsio T4 Ethernet driver for Linux.
	3	*
	4	* Copyright (c) 2003-2010 Chelsio Communications, Inc. All rights reserved.
	5	*
	6	* This software is available to you under a choice of one of two
	7	* licenses. You may choose to be licensed under the terms of the GNU
	8	* General Public License (GPL) Version 2, available from the file
	9	* COPYING in the main directory of this source tree, or the
	10	* OpenIB.org BSD license below:
	11	*
	12	* Redistribution and use in source and binary forms, with or
	13	* without modification, are permitted provided that the following
	14	* conditions are met:
	15	*
	16	* - Redistributions of source code must retain the above
	17	* copyright notice, this list of conditions and the following
	18	* disclaimer.
	19	*
	20	* - Redistributions in binary form must reproduce the above
	21	* copyright notice, this list of conditions and the following
	22	* disclaimer in the documentation and/or other materials
	23	* provided with the distribution.
	24	*
	25	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	26	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	27	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	28	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	29	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	30	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	31	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	32	* SOFTWARE.
	33	*/
	34
	35	#ifndef __CXGB4_L2T_H
	36	#define __CXGB4_L2T_H
	37
	38	#include <linux/spinlock.h>
	39	#include <linux/if_ether.h>
	40	#include <asm/atomic.h>
	41
	42	struct adapter;
	43	struct l2t_data;
	44	struct neighbour;
	45	struct net_device;
	46	struct file_operations;
	47	struct cpl_l2t_write_rpl;
	48
	49	/*
	50	* Each L2T entry plays multiple roles. First of all, it keeps state for the
	51	* corresponding entry of the HW L2 table and maintains a queue of offload
	52	* packets awaiting address resolution. Second, it is a node of a hash table
	53	* chain, where the nodes of the chain are linked together through their next
	54	* pointer. Finally, each node is a bucket of a hash table, pointing to the
	55	* first element in its chain through its first pointer.
	56	*/
	57	struct l2t_entry {
	58	u16 state; /* entry state */
	59	u16 idx; /* entry index */
	60	u32 addr[4]; /* next hop IP or IPv6 address */
	61	int ifindex; /* neighbor's net_device's ifindex */
	62	struct neighbour neigh; / associated neighbour */
	63	struct l2t_entry first; / start of hash chain */
	64	struct l2t_entry next; / next l2t_entry on chain */
65	struct sk_buff arpq_head; / queue of packets awaiting resolution */
66	struct sk_buff *arpq_tail;
67	spinlock_t lock;
68	atomic_t refcnt; /* entry reference count */
69	u16 hash; /* hash bucket the entry is on */
70	u16 vlan; /* VLAN TCI (id: bits 0-11, prio: 13-15 */
71	u8 v6; /* whether entry is for IPv6 */
72	u8 lport; /* associated offload logical interface */
73	u8 dmac[ETH_ALEN]; /* neighbour's MAC address */
74	};
75
76	typedef void (arp_err_handler_t)(void handle, struct sk_buff *skb);
77
78	/*
79	* Callback stored in an skb to handle address resolution failure.
80	*/
81	struct l2t_skb_cb {
82	void *handle;
83	arp_err_handler_t arp_err_handler;
84	};
85
86	#define L2T_SKB_CB(skb) ((struct l2t_skb_cb *)(skb)->cb)
87
88	static inline void t4_set_arp_err_handler(struct sk_buff skb, void handle,
89	arp_err_handler_t handler)
90	{
91	L2T_SKB_CB(skb)->handle = handle;
92	L2T_SKB_CB(skb)->arp_err_handler = handler;
93	}
94
95	void cxgb4_l2t_release(struct l2t_entry *e);
96	int cxgb4_l2t_send(struct net_device dev, struct sk_buff skb,
97	struct l2t_entry *e);
98	struct l2t_entry cxgb4_l2t_get(struct l2t_data d, struct neighbour *neigh,
99	const struct net_device *physdev,
100	unsigned int priority);
101
102	void t4_l2t_update(struct adapter adap, struct neighbour neigh);
625ba2c2 DM	103	struct l2t_data *t4_init_l2t(void);
	104	void do_l2t_write_rpl(struct adapter p, const struct cpl_l2t_write_rpl rpl);
	105
	106	extern const struct file_operations t4_l2t_fops;
	107	#endif /* __CXGB4_L2T_H */