sys/dev/cxgbe/t4_l2t.h

root/sys/dev/cxgbe/t4_l2t.h
/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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.
 *
 */

#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_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_TLS,          /* entry is being used by TLS sessions */
        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 */
        uint32_t iqid;                  /* iqid for reply to write_l2e */
        struct sge_wrq *wrq;            /* queue to use for write_l2e */
        if_t ifp;                       /* outgoing interface */
        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 hw_port;                /* associated hardware port idx */
        uint8_t dmac[ETHER_ADDR_LEN];   /* next hop's MAC address */
};

struct l2t_data {
        struct rwlock lock;
        u_int l2t_size;
        bool l2t_stopped;
        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 adapter *);
int t4_stop_l2t(struct adapter *);
int t4_restart_l2t(struct adapter *);
struct l2t_entry *t4_alloc_l2e(struct l2t_data *);
struct l2t_entry *t4_l2t_alloc_switching(struct adapter *, uint16_t, uint8_t,
    uint8_t *);
struct l2t_entry *t4_l2t_alloc_tls(struct adapter *, struct sge_txq *,
    void *, int *, uint16_t, uint8_t, uint8_t *);
int t4_write_l2e(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);
}

int sysctl_l2t(SYSCTL_HANDLER_ARGS);

#endif  /* __T4_L2T_H */
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