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/*-
* Copyright (c) 2011 Chelsio Communications, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*
*/
#ifndef __T4_L2T_H
#define __T4_L2T_H
/* identifies sync vs async L2T_WRITE_REQs */
#define S_SYNC_WR 12
#define V_SYNC_WR(x) ((x) << S_SYNC_WR)
#define F_SYNC_WR V_SYNC_WR(1)
enum { L2T_SIZE = 4096 }; /* # of L2T entries */
enum {
L2T_STATE_VALID, /* entry is up to date */
L2T_STATE_STALE, /* entry may be used but needs revalidation */
L2T_STATE_RESOLVING, /* entry needs address resolution */
L2T_STATE_FAILED, /* failed to resolve */
L2T_STATE_SYNC_WRITE, /* synchronous write of entry underway */
/* when state is one of the below the entry is not hashed */
L2T_STATE_SWITCHING, /* entry is being used by a switching filter */
L2T_STATE_UNUSED /* entry not in use */
};
/*
* Each L2T entry plays multiple roles. First of all, it keeps state for the
* corresponding entry of the HW L2 table and maintains a queue of offload
* packets awaiting address resolution. Second, it is a node of a hash table
* chain, where the nodes of the chain are linked together through their next
* pointer. Finally, each node is a bucket of a hash table, pointing to the
* first element in its chain through its first pointer.
*/
struct l2t_entry {
uint16_t state; /* entry state */
uint16_t idx; /* entry index */
uint32_t addr[4]; /* next hop IP or IPv6 address */
struct ifnet *ifp; /* outgoing interface */
uint16_t smt_idx; /* SMT index */
uint16_t vlan; /* VLAN TCI (id: 0-11, prio: 13-15) */
struct l2t_entry *first; /* start of hash chain */
struct l2t_entry *next; /* next l2t_entry on chain */
STAILQ_HEAD(, wrqe) wr_list; /* list of WRs awaiting resolution */
struct mtx lock;
volatile int refcnt; /* entry reference count */
uint16_t hash; /* hash bucket the entry is on */
uint8_t ipv6; /* entry is for an IPv6 address */
uint8_t lport; /* associated offload logical port */
uint8_t dmac[ETHER_ADDR_LEN]; /* next hop's MAC address */
};
struct l2t_data {
struct rwlock lock;
u_int l2t_size;
volatile int nfree; /* number of free entries */
struct l2t_entry *rover;/* starting point for next allocation */
struct l2t_entry l2tab[];
};
int t4_init_l2t(struct adapter *, int);
int t4_free_l2t(struct l2t_data *);
struct l2t_entry *t4_alloc_l2e(struct l2t_data *);
struct l2t_entry *t4_l2t_alloc_switching(struct l2t_data *);
int t4_l2t_set_switching(struct adapter *, struct l2t_entry *, uint16_t,
uint8_t, uint8_t *);
int t4_write_l2e(struct adapter *, struct l2t_entry *, int);
int do_l2t_write_rpl(struct sge_iq *, const struct rss_header *, struct mbuf *);
static inline void
t4_l2t_release(struct l2t_entry *e)
{
struct l2t_data *d = __containerof(e, struct l2t_data, l2tab[e->idx]);
if (atomic_fetchadd_int(&e->refcnt, -1) == 1)
atomic_add_int(&d->nfree, 1);
}
#ifdef SBUF_DRAIN
int sysctl_l2t(SYSCTL_HANDLER_ARGS);
#endif
#endif /* __T4_L2T_H */
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