129 lines
5.0 KiB
C
129 lines
5.0 KiB
C
/*
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* This file is part of the Chelsio T4 Ethernet driver for Linux.
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*
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* Copyright (c) 2003-2014 Chelsio Communications, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef __CXGB4_L2T_H
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#define __CXGB4_L2T_H
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#include <linux/spinlock.h>
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#include <linux/if_ether.h>
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#include <linux/atomic.h>
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#define VLAN_NONE 0xfff
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enum { L2T_SIZE = 4096 }; /* # of L2T entries */
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enum {
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L2T_STATE_VALID, /* entry is up to date */
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L2T_STATE_STALE, /* entry may be used but needs revalidation */
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L2T_STATE_RESOLVING, /* entry needs address resolution */
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L2T_STATE_SYNC_WRITE, /* synchronous write of entry underway */
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L2T_STATE_NOARP, /* Netdev down or removed*/
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/* when state is one of the below the entry is not hashed */
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L2T_STATE_SWITCHING, /* entry is being used by a switching filter */
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L2T_STATE_UNUSED /* entry not in use */
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};
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struct adapter;
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struct l2t_data;
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struct neighbour;
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struct net_device;
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struct file_operations;
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struct cpl_l2t_write_rpl;
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/*
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* Each L2T entry plays multiple roles. First of all, it keeps state for the
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* corresponding entry of the HW L2 table and maintains a queue of offload
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* packets awaiting address resolution. Second, it is a node of a hash table
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* chain, where the nodes of the chain are linked together through their next
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* pointer. Finally, each node is a bucket of a hash table, pointing to the
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* first element in its chain through its first pointer.
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*/
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struct l2t_entry {
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u16 state; /* entry state */
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u16 idx; /* entry index within in-memory table */
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u32 addr[4]; /* next hop IP or IPv6 address */
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int ifindex; /* neighbor's net_device's ifindex */
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struct neighbour *neigh; /* associated neighbour */
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struct l2t_entry *first; /* start of hash chain */
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struct l2t_entry *next; /* next l2t_entry on chain */
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struct sk_buff_head arpq; /* packet queue awaiting resolution */
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spinlock_t lock;
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atomic_t refcnt; /* entry reference count */
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u16 hash; /* hash bucket the entry is on */
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u16 vlan; /* VLAN TCI (id: bits 0-11, prio: 13-15 */
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u8 v6; /* whether entry is for IPv6 */
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u8 lport; /* associated offload logical interface */
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u8 dmac[ETH_ALEN]; /* neighbour's MAC address */
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};
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typedef void (*arp_err_handler_t)(void *handle, struct sk_buff *skb);
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/*
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* Callback stored in an skb to handle address resolution failure.
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*/
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struct l2t_skb_cb {
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void *handle;
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arp_err_handler_t arp_err_handler;
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};
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#define L2T_SKB_CB(skb) ((struct l2t_skb_cb *)(skb)->cb)
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static inline void t4_set_arp_err_handler(struct sk_buff *skb, void *handle,
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arp_err_handler_t handler)
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{
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L2T_SKB_CB(skb)->handle = handle;
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L2T_SKB_CB(skb)->arp_err_handler = handler;
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}
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void cxgb4_l2t_release(struct l2t_entry *e);
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int cxgb4_l2t_send(struct net_device *dev, struct sk_buff *skb,
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struct l2t_entry *e);
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struct l2t_entry *cxgb4_l2t_get(struct l2t_data *d, struct neighbour *neigh,
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const struct net_device *physdev,
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unsigned int priority);
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u64 cxgb4_select_ntuple(struct net_device *dev,
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const struct l2t_entry *l2t);
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struct l2t_entry *cxgb4_l2t_alloc_switching(struct net_device *dev, u16 vlan,
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u8 port, u8 *dmac);
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void t4_l2t_update(struct adapter *adap, struct neighbour *neigh);
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struct l2t_entry *t4_l2t_alloc_switching(struct adapter *adap, u16 vlan,
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u8 port, u8 *dmac);
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struct l2t_data *t4_init_l2t(unsigned int l2t_start, unsigned int l2t_end);
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void do_l2t_write_rpl(struct adapter *p, const struct cpl_l2t_write_rpl *rpl);
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bool cxgb4_check_l2t_valid(struct l2t_entry *e);
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extern const struct file_operations t4_l2t_fops;
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#endif /* __CXGB4_L2T_H */
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