Dimitris Michailidis | 625ba2c | 2010-04-01 15:28:25 +0000 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the Chelsio T4 Ethernet driver for Linux. |
| 3 | * |
Anish Bhatt | ce100b8b | 2014-06-19 21:37:15 -0700 | [diff] [blame] | 4 | * Copyright (c) 2003-2014 Chelsio Communications, Inc. All rights reserved. |
Dimitris Michailidis | 625ba2c | 2010-04-01 15:28:25 +0000 | [diff] [blame] | 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> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 40 | #include <linux/atomic.h> |
Dimitris Michailidis | 625ba2c | 2010-04-01 15:28:25 +0000 | [diff] [blame] | 41 | |
Varun Prakash | a8d9380 | 2016-02-14 23:07:40 +0530 | [diff] [blame] | 42 | #define VLAN_NONE 0xfff |
| 43 | |
Hariprasad Shenai | 5be9ed8 | 2015-07-07 21:49:18 +0530 | [diff] [blame] | 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 | |
Dimitris Michailidis | 625ba2c | 2010-04-01 15:28:25 +0000 | [diff] [blame] | 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 */ |
Hariprasad Shenai | 5be9ed8 | 2015-07-07 21:49:18 +0530 | [diff] [blame] | 75 | u16 idx; /* entry index within in-memory table */ |
Dimitris Michailidis | 625ba2c | 2010-04-01 15:28:25 +0000 | [diff] [blame] | 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 */ |
Hariprasad Shenai | 749cb5f | 2015-12-17 13:45:10 +0530 | [diff] [blame] | 81 | struct sk_buff_head arpq; /* packet queue awaiting resolution */ |
Dimitris Michailidis | 625ba2c | 2010-04-01 15:28:25 +0000 | [diff] [blame] | 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); |
Kumar Sanghvi | dcf7b6f | 2013-12-18 16:38:23 +0530 | [diff] [blame] | 116 | u64 cxgb4_select_ntuple(struct net_device *dev, |
| 117 | const struct l2t_entry *l2t); |
Hariprasad Shenai | f750265 | 2015-12-17 13:45:08 +0530 | [diff] [blame] | 118 | struct l2t_entry *cxgb4_l2t_alloc_switching(struct net_device *dev, u16 vlan, |
| 119 | u8 port, u8 *dmac); |
Dimitris Michailidis | 625ba2c | 2010-04-01 15:28:25 +0000 | [diff] [blame] | 120 | void t4_l2t_update(struct adapter *adap, struct neighbour *neigh); |
Hariprasad Shenai | f750265 | 2015-12-17 13:45:08 +0530 | [diff] [blame] | 121 | struct l2t_entry *t4_l2t_alloc_switching(struct adapter *adap, u16 vlan, |
| 122 | u8 port, u8 *dmac); |
Hariprasad Shenai | 5be9ed8 | 2015-07-07 21:49:18 +0530 | [diff] [blame] | 123 | struct l2t_data *t4_init_l2t(unsigned int l2t_start, unsigned int l2t_end); |
Dimitris Michailidis | 625ba2c | 2010-04-01 15:28:25 +0000 | [diff] [blame] | 124 | void do_l2t_write_rpl(struct adapter *p, const struct cpl_l2t_write_rpl *rpl); |
| 125 | |
| 126 | extern const struct file_operations t4_l2t_fops; |
| 127 | #endif /* __CXGB4_L2T_H */ |