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 | |
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 | |