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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 two7 * licenses. You may choose to be licensed under the terms of the GNU8 * General Public License (GPL) Version 2, available from the file9 * COPYING in the main directory of this source tree, or the10 * OpenIB.org BSD license below:11 *12 * Redistribution and use in source and binary forms, with or13 * without modification, are permitted provided that the following14 * conditions are met:15 *16 * - Redistributions of source code must retain the above17 * copyright notice, this list of conditions and the following18 * disclaimer.19 *20 * - Redistributions in binary form must reproduce the above21 * copyright notice, this list of conditions and the following22 * disclaimer in the documentation and/or other materials23 * 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 OF27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE32 * SOFTWARE.33 */34 35#ifndef __CXGB4_L2T_H36#define __CXGB4_L2T_H37 38#include <linux/spinlock.h>39#include <linux/if_ether.h>40#include <linux/atomic.h>41 42#define VLAN_NONE 0xfff43 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 the67 * corresponding entry of the HW L2 table and maintains a queue of offload68 * packets awaiting address resolution. Second, it is a node of a hash table69 * chain, where the nodes of the chain are linked together through their next70 * pointer. Finally, each node is a bucket of a hash table, pointing to the71 * 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