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 <linux/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_data *t4_init_l2t(void);
104void do_l2t_write_rpl(struct adapter *p, const struct cpl_l2t_write_rpl *rpl);
105
106extern const struct file_operations t4_l2t_fops;
107#endif  /* __CXGB4_L2T_H */