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) 2003-2014 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
  44enum { L2T_SIZE = 4096 };     /* # of L2T entries */
  45
  46enum {
  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
  58struct adapter;
  59struct l2t_data;
  60struct neighbour;
  61struct net_device;
  62struct file_operations;
  63struct 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 */
  73struct 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
  91typedef 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 */
  96struct 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
 103static 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
 110void cxgb4_l2t_release(struct l2t_entry *e);
 111int cxgb4_l2t_send(struct net_device *dev, struct sk_buff *skb,
 112                   struct l2t_entry *e);
 113struct l2t_entry *cxgb4_l2t_get(struct l2t_data *d, struct neighbour *neigh,
 114                                const struct net_device *physdev,
 115                                unsigned int priority);
 116u64 cxgb4_select_ntuple(struct net_device *dev,
 117                        const struct l2t_entry *l2t);
 118struct l2t_entry *cxgb4_l2t_alloc_switching(struct net_device *dev, u16 vlan,
 119                                            u8 port, u8 *dmac);
 120void t4_l2t_update(struct adapter *adap, struct neighbour *neigh);
 121struct l2t_entry *t4_l2t_alloc_switching(struct adapter *adap, u16 vlan,
 122                                         u8 port, u8 *dmac);
 123struct l2t_data *t4_init_l2t(unsigned int l2t_start, unsigned int l2t_end);
 124void do_l2t_write_rpl(struct adapter *p, const struct cpl_l2t_write_rpl *rpl);
 125bool cxgb4_check_l2t_valid(struct l2t_entry *e);
 126
 127extern const struct file_operations t4_l2t_fops;
 128#endif  /* __CXGB4_L2T_H */
 129