/* * This file is part of the Chelsio T4 Ethernet driver for Linux. * * Copyright (c) 2003-2014 Chelsio Communications, Inc. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE.
*/
enum {
L2T_STATE_VALID, /* entry is up to date */
L2T_STATE_STALE, /* entry may be used but needs revalidation */
L2T_STATE_RESOLVING, /* entry needs address resolution */
L2T_STATE_SYNC_WRITE, /* synchronous write of entry underway */
L2T_STATE_NOARP, /* Netdev down or removed*/
/* when state is one of the below the entry is not hashed */
L2T_STATE_SWITCHING, /* entry is being used by a switching filter */
L2T_STATE_UNUSED /* entry not in use */
};
/* * Each L2T entry plays multiple roles. First of all, it keeps state for the * corresponding entry of the HW L2 table and maintains a queue of offload * packets awaiting address resolution. Second, it is a node of a hash table * chain, where the nodes of the chain are linked together through their next * pointer. Finally, each node is a bucket of a hash table, pointing to the * first element in its chain through its first pointer.
*/ struct l2t_entry {
u16 state; /* entry state */
u16 idx; /* entry index within in-memory table */
u32 addr[4]; /* next hop IP or IPv6 address */ int ifindex; /* neighbor's net_device's ifindex */ struct neighbour *neigh; /* associated neighbour */ struct l2t_entry *first; /* start of hash chain */ struct l2t_entry *next; /* next l2t_entry on chain */ struct sk_buff_head arpq; /* packet queue awaiting resolution */
spinlock_t lock;
atomic_t refcnt; /* entry reference count */
u16 hash; /* hash bucket the entry is on */
u16 vlan; /* VLAN TCI (id: bits 0-11, prio: 13-15 */
u8 v6; /* whether entry is for IPv6 */
u8 lport; /* associated offload logical interface */
u8 dmac[ETH_ALEN]; /* neighbour's MAC address */
};
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