t4_l2t.h revision 331722 
1/*-
2 * Copyright (c) 2011 Chelsio Communications, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/11/sys/dev/cxgbe/t4_l2t.h 331722 2018-03-29 02:50:57Z eadler $
27 *
28 */
29
30#ifndef __T4_L2T_H
31#define __T4_L2T_H
32
33/* identifies sync vs async L2T_WRITE_REQs */
34#define S_SYNC_WR    12
35#define V_SYNC_WR(x) ((x) << S_SYNC_WR)
36#define F_SYNC_WR    V_SYNC_WR(1)
37
38enum { L2T_SIZE = 4096 };     /* # of L2T entries */
39
40enum {
41	L2T_STATE_VALID,	/* entry is up to date */
42	L2T_STATE_STALE,	/* entry may be used but needs revalidation */
43	L2T_STATE_RESOLVING,	/* entry needs address resolution */
44	L2T_STATE_FAILED,	/* failed to resolve */
45	L2T_STATE_SYNC_WRITE,	/* synchronous write of entry underway */
46
47	/* when state is one of the below the entry is not hashed */
48	L2T_STATE_SWITCHING,	/* entry is being used by a switching filter */
49	L2T_STATE_UNUSED	/* entry not in use */
50};
51
52/*
53 * Each L2T entry plays multiple roles.  First of all, it keeps state for the
54 * corresponding entry of the HW L2 table and maintains a queue of offload
55 * packets awaiting address resolution.  Second, it is a node of a hash table
56 * chain, where the nodes of the chain are linked together through their next
57 * pointer.  Finally, each node is a bucket of a hash table, pointing to the
58 * first element in its chain through its first pointer.
59 */
60struct l2t_entry {
61	uint16_t state;			/* entry state */
62	uint16_t idx;			/* entry index */
63	uint32_t addr[4];		/* next hop IP or IPv6 address */
64	uint32_t iqid;			/* iqid for reply to write_l2e */
65	struct sge_wrq *wrq;		/* queue to use for write_l2e */
66	struct ifnet *ifp;		/* outgoing interface */
67	uint16_t smt_idx;		/* SMT index */
68	uint16_t vlan;			/* VLAN TCI (id: 0-11, prio: 13-15) */
69	struct l2t_entry *first;	/* start of hash chain */
70	struct l2t_entry *next;		/* next l2t_entry on chain */
71	STAILQ_HEAD(, wrqe) wr_list;	/* list of WRs awaiting resolution */
72	struct mtx lock;
73	volatile int refcnt;		/* entry reference count */
74	uint16_t hash;			/* hash bucket the entry is on */
75	uint8_t ipv6;			/* entry is for an IPv6 address */
76	uint8_t lport;			/* associated offload logical port */
77	uint8_t dmac[ETHER_ADDR_LEN];	/* next hop's MAC address */
78};
79
80struct l2t_data {
81	struct rwlock lock;
82	u_int l2t_size;
83	volatile int nfree;	/* number of free entries */
84	struct l2t_entry *rover;/* starting point for next allocation */
85	struct l2t_entry l2tab[];
86};
87
88
89int t4_init_l2t(struct adapter *, int);
90int t4_free_l2t(struct l2t_data *);
91struct l2t_entry *t4_alloc_l2e(struct l2t_data *);
92struct l2t_entry *t4_l2t_alloc_switching(struct l2t_data *);
93int t4_l2t_set_switching(struct adapter *, struct l2t_entry *, uint16_t,
94    uint8_t, uint8_t *);
95int t4_write_l2e(struct l2t_entry *, int);
96int do_l2t_write_rpl(struct sge_iq *, const struct rss_header *, struct mbuf *);
97
98static inline void
99t4_l2t_release(struct l2t_entry *e)
100{
101	struct l2t_data *d = __containerof(e, struct l2t_data, l2tab[e->idx]);
102
103	if (atomic_fetchadd_int(&e->refcnt, -1) == 1)
104		atomic_add_int(&d->nfree, 1);
105}
106
107
108#ifdef SBUF_DRAIN
109int sysctl_l2t(SYSCTL_HANDLER_ARGS);
110#endif
111
112#endif  /* __T4_L2T_H */
113