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l2t.h
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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 <linux/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;
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;
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);
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 */