1 /*
2  * This file and its contents are supplied under the terms of the
3  * Common Development and Distribution License ("CDDL"), version 1.0.
4  * You may only use this file in accordance with the terms of version
5  * 1.0 of the CDDL.
6  *
7  * A full copy of the text of the CDDL should have accompanied this
8  * source. A copy of the CDDL is also available via the Internet at
9  * http://www.illumos.org/license/CDDL.
10  */
11 
12 /*
13  * This file is part of the Chelsio T4 support code.
14  *
15  * Copyright (C) 2010-2013 Chelsio Communications.  All rights reserved.
16  *
17  * This program is distributed in the hope that it will be useful, but WITHOUT
18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19  * FITNESS FOR A PARTICULAR PURPOSE.  See the LICENSE file included in this
20  * release for licensing terms and conditions.
21  */
22 
23 #ifndef __CXGBE_T4L2T_H
24 #define	__CXGBE_T4L2T_H
25 
26 #include <inet/ip.h>
27 #include <inet/ip2mac.h>
28 
29 enum { L2T_SIZE = 4096 };	/* # of L2T entries */
30 
31 #define	MBUF_EQ(mp)	(*((void **)(&(mp)->b_datap->db_cksumstuff)))
32 
33 /*
34  * Each L2T entry plays multiple roles.  First of all, it keeps state for the
35  * corresponding entry of the HW L2 table and maintains a queue of offload
36  * packets awaiting address resolution.  Second, it is a node of a hash table
37  * chain, where the nodes of the chain are linked together through their next
38  * pointer.  Finally, each node is a bucket of a hash table, pointing to the
39  * first element in its chain through its first pointer.
40  */
41 struct l2t_entry {
42 	uint16_t state;			/* entry state */
43 	uint16_t idx;			/* entry index */
44 	uint32_t addr[4];		/* next hop IP or IPv6 address */
45 	in_addr_t in_addr;
46 	struct adapter *sc;		/* associated adapter */
47 	uint16_t smt_idx;		/* SMT index */
48 	uint16_t vlan;			/* VLAN TCI (id: 0-11, prio: 13-15) */
49 	int ifindex;			/* interface index */
50 	struct l2t_entry *first;	/* start of hash chain */
51 	struct l2t_entry *next;		/* next l2t_entry on chain */
52 	mblk_t *arpq_head;	/* list of mblks awaiting resolution */
53 	mblk_t *arpq_tail;
54 	kmutex_t lock;
55 	volatile uint_t refcnt;		/* entry reference count */
56 	uint16_t hash;			/* hash bucket the entry is on */
57 	uint8_t v6;			/* whether entry is for IPv6 */
58 	uint8_t lport;			/* associated offload logical port */
59 	uint8_t dmac[ETHERADDRL];	/* next hop's MAC address */
60 };
61 
62 int t4_free_l2t(struct l2t_data *d);
63 void t4_l2t_release(struct l2t_entry *e);
64 int  do_l2t_write_rpl(struct sge_iq *iq, const struct rss_header *rss,
65     mblk_t *m);
66 
67 #ifdef TCP_OFFLOAD_ENABLE
68 struct l2t_entry *t4_l2t_get(struct port_info *pi, conn_t *connp);
69 int t4_l2t_send(struct adapter *sc, mblk_t *m, struct l2t_entry *e);
70 void t4_l2t_update(ip2mac_t *ip2macp, void* arg);
71 #endif
72 
73 #endif /* __CXGBE_T4L2T_H */
74