t4_smt.h revision 346866 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2018 Chelsio Communications, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: stable/11/sys/dev/cxgbe/t4_smt.h 346866 2019-04-29 01:15:22Z np $
29 *
30 */
31
32#ifndef __T4_SMT_H
33#define __T4_SMT_H
34
35/* identifies sync vs async SMT_WRITE_REQs */
36#define S_SYNC_WR    12
37#define V_SYNC_WR(x) ((x) << S_SYNC_WR)
38#define F_SYNC_WR    V_SYNC_WR(1)
39
40enum { SMT_SIZE = 256 };     /* # of SMT entries */
41
42enum {
43	SMT_STATE_SWITCHING,	/* entry is being used by a switching filter */
44	SMT_STATE_UNUSED,	/* entry not in use */
45	SMT_STATE_ERROR		/* entry is in error state */
46};
47
48struct smt_entry {
49	uint16_t state;			/* entry state */
50	uint16_t idx;			/* entry index */
51	uint32_t iqid;                  /* iqid for reply to write_sme */
52	struct sge_wrq *wrq;            /* queue to use for write_sme */
53	uint16_t pfvf;			/* pfvf number */
54	volatile int refcnt;		/* entry reference count */
55	uint8_t smac[ETHER_ADDR_LEN];	/* source MAC address */
56	struct mtx lock;
57};
58
59struct smt_data {
60	struct rwlock lock;
61	u_int smt_size;
62	struct smt_entry smtab[];
63};
64
65
66int t4_init_smt(struct adapter *, int);
67int t4_free_smt(struct smt_data *);
68struct smt_entry *t4_find_or_alloc_sme(struct smt_data *, uint8_t *);
69struct smt_entry *t4_smt_alloc_switching(struct smt_data *, uint8_t *);
70int t4_smt_set_switching(struct adapter *, struct smt_entry *,
71					uint16_t, uint8_t *);
72int t4_write_sme(struct smt_entry *);
73int do_smt_write_rpl(struct sge_iq *, const struct rss_header *, struct mbuf *);
74
75static inline void
76t4_smt_release(struct smt_entry *e)
77{
78	MPASS(e != NULL);
79	if (atomic_fetchadd_int(&e->refcnt, -1) == 1) {
80		mtx_lock(&e->lock);
81		e->state = SMT_STATE_UNUSED;
82		mtx_unlock(&e->lock);
83	}
84
85}
86
87int sysctl_smt(SYSCTL_HANDLER_ARGS);
88
89#endif  /* __T4_SMT_H */
90