1 /*
2 * This file is part of the Chelsio T4 Ethernet driver for Linux.
3 *
4 * Copyright (c) 2003-2014 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 #define VLAN_NONE 0xfff
43
44 enum { L2T_SIZE = 4096 }; /* # of L2T entries */
45
46 enum {
47 L2T_STATE_VALID, /* entry is up to date */
48 L2T_STATE_STALE, /* entry may be used but needs revalidation */
49 L2T_STATE_RESOLVING, /* entry needs address resolution */
50 L2T_STATE_SYNC_WRITE, /* synchronous write of entry underway */
51 L2T_STATE_NOARP, /* Netdev down or removed*/
52
53 /* when state is one of the below the entry is not hashed */
54 L2T_STATE_SWITCHING, /* entry is being used by a switching filter */
55 L2T_STATE_UNUSED /* entry not in use */
56 };
57
58 struct adapter;
59 struct l2t_data;
60 struct neighbour;
61 struct net_device;
62 struct file_operations;
63 struct cpl_l2t_write_rpl;
64
65 /*
66 * Each L2T entry plays multiple roles. First of all, it keeps state for the
67 * corresponding entry of the HW L2 table and maintains a queue of offload
68 * packets awaiting address resolution. Second, it is a node of a hash table
69 * chain, where the nodes of the chain are linked together through their next
70 * pointer. Finally, each node is a bucket of a hash table, pointing to the
71 * first element in its chain through its first pointer.
72 */
73 struct l2t_entry {
74 u16 state; /* entry state */
75 u16 idx; /* entry index within in-memory table */
76 u32 addr[4]; /* next hop IP or IPv6 address */
77 int ifindex; /* neighbor's net_device's ifindex */
78 struct neighbour *neigh; /* associated neighbour */
79 struct l2t_entry *first; /* start of hash chain */
80 struct l2t_entry *next; /* next l2t_entry on chain */
81 struct sk_buff_head arpq; /* packet queue awaiting resolution */
82 spinlock_t lock;
83 atomic_t refcnt; /* entry reference count */
84 u16 hash; /* hash bucket the entry is on */
85 u16 vlan; /* VLAN TCI (id: bits 0-11, prio: 13-15 */
86 u8 v6; /* whether entry is for IPv6 */
87 u8 lport; /* associated offload logical interface */
88 u8 dmac[ETH_ALEN]; /* neighbour's MAC address */
89 };
90
91 typedef void (*arp_err_handler_t)(void *handle, struct sk_buff *skb);
92
93 /*
94 * Callback stored in an skb to handle address resolution failure.
95 */
96 struct l2t_skb_cb {
97 void *handle;
98 arp_err_handler_t arp_err_handler;
99 };
100
101 #define L2T_SKB_CB(skb) ((struct l2t_skb_cb *)(skb)->cb)
102
t4_set_arp_err_handler(struct sk_buff * skb,void * handle,arp_err_handler_t handler)103 static inline void t4_set_arp_err_handler(struct sk_buff *skb, void *handle,
104 arp_err_handler_t handler)
105 {
106 L2T_SKB_CB(skb)->handle = handle;
107 L2T_SKB_CB(skb)->arp_err_handler = handler;
108 }
109
110 void cxgb4_l2t_release(struct l2t_entry *e);
111 int cxgb4_l2t_send(struct net_device *dev, struct sk_buff *skb,
112 struct l2t_entry *e);
113 struct l2t_entry *cxgb4_l2t_get(struct l2t_data *d, struct neighbour *neigh,
114 const struct net_device *physdev,
115 unsigned int priority);
116 u64 cxgb4_select_ntuple(struct net_device *dev,
117 const struct l2t_entry *l2t);
118 struct l2t_entry *cxgb4_l2t_alloc_switching(struct net_device *dev, u16 vlan,
119 u8 port, u8 *dmac);
120 void t4_l2t_update(struct adapter *adap, struct neighbour *neigh);
121 struct l2t_entry *t4_l2t_alloc_switching(struct adapter *adap, u16 vlan,
122 u8 port, u8 *dmac);
123 struct l2t_data *t4_init_l2t(unsigned int l2t_start, unsigned int l2t_end);
124 void do_l2t_write_rpl(struct adapter *p, const struct cpl_l2t_write_rpl *rpl);
125 bool cxgb4_check_l2t_valid(struct l2t_entry *e);
126
127 extern const struct file_operations t4_l2t_fops;
128 #endif /* __CXGB4_L2T_H */
129