LXR linux/drivers/net/ethernet/chelsio/cxgb4/l2t.h

   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);
 101u64 cxgb4_select_ntuple(struct net_device *dev,
 102                        const struct l2t_entry *l2t);
 103void t4_l2t_update(struct adapter *adap, struct neighbour *neigh);
 104struct l2t_entry *t4_l2t_alloc_switching(struct l2t_data *d);
 105int t4_l2t_set_switching(struct adapter *adap, struct l2t_entry *e, u16 vlan,
 106                         u8 port, u8 *eth_addr);
 107struct l2t_data *t4_init_l2t(void);
 108void do_l2t_write_rpl(struct adapter *p, const struct cpl_l2t_write_rpl *rpl);
 109
 110extern const struct file_operations t4_l2t_fops;
 111#endif  /* __CXGB4_L2T_H */
 112