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 <asm/atomic.h> 41 42struct adapter; 43struct l2t_data; 44struct neighbour; 45struct net_device; 46struct file_operations; 47struct 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 */ 57struct 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; 67 spinlock_t lock; 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 76typedef 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 */ 81struct l2t_skb_cb { 82 void *handle; 83 arp_err_handler_t arp_err_handler; 84}; 85 86#define L2T_SKB_CB(skb) ((struct l2t_skb_cb *)(skb)->cb) 87 88static 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 95void cxgb4_l2t_release(struct l2t_entry *e); 96int cxgb4_l2t_send(struct net_device *dev, struct sk_buff *skb, 97 struct l2t_entry *e); 98struct l2t_entry *cxgb4_l2t_get(struct l2t_data *d, struct neighbour *neigh, 99 const struct net_device *physdev, 100 unsigned int priority); 101 102void t4_l2t_update(struct adapter *adap, struct neighbour *neigh); 103struct l2t_entry *t4_l2t_alloc_switching(struct l2t_data *d); 104int t4_l2t_set_switching(struct adapter *adap, struct l2t_entry *e, u16 vlan, 105 u8 port, u8 *eth_addr); 106struct l2t_data *t4_init_l2t(void); 107void do_l2t_write_rpl(struct adapter *p, const struct cpl_l2t_write_rpl *rpl); 108 109extern const struct file_operations t4_l2t_fops; 110#endif /* __CXGB4_L2T_H */ 111