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

/*
 * 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.
 */

#ifndef __CXGB4_L2T_H
#define __CXGB4_L2T_H

#include <linux/spinlock.h>
#include <linux/if_ether.h>
#include <linux/atomic.h>

#define VLAN_NONE …

enum { … };     /* # of L2T entries */

enum { … };

struct adapter;
struct l2t_data;
struct neighbour;
struct net_device;
struct file_operations;
struct cpl_l2t_write_rpl;

/*
 * 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 { … };

arp_err_handler_t;

/*
 * Callback stored in an skb to handle address resolution failure.
 */
struct l2t_skb_cb { … };

#define L2T_SKB_CB(skb) …

static inline void t4_set_arp_err_handler(struct sk_buff *skb, void *handle,
					  arp_err_handler_t handler)
{ … }

void cxgb4_l2t_release(struct l2t_entry *e);
int cxgb4_l2t_send(struct net_device *dev, struct sk_buff *skb,
		   struct l2t_entry *e);
struct l2t_entry *cxgb4_l2t_get(struct l2t_data *d, struct neighbour *neigh,
				const struct net_device *physdev,
				unsigned int priority);
u64 cxgb4_select_ntuple(struct net_device *dev,
			const struct l2t_entry *l2t);
struct l2t_entry *cxgb4_l2t_alloc_switching(struct net_device *dev, u16 vlan,
					    u8 port, u8 *dmac);
void t4_l2t_update(struct adapter *adap, struct neighbour *neigh);
struct l2t_entry *t4_l2t_alloc_switching(struct adapter *adap, u16 vlan,
					 u8 port, u8 *dmac);
struct l2t_data *t4_init_l2t(unsigned int l2t_start, unsigned int l2t_end);
void do_l2t_write_rpl(struct adapter *p, const struct cpl_l2t_write_rpl *rpl);
bool cxgb4_check_l2t_valid(struct l2t_entry *e);

extern const struct file_operations t4_l2t_fops;
#endif  /* __CXGB4_L2T_H */