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