FreeBSD/Linux Kernel Cross Reference
sys/dev/cxgbe/t4_smt.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2018 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_SMT_H
    #define __T4_SMT_H
    
    /* identifies sync vs async SMT_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 { SMT_SIZE = 256 };     /* # of SMT entries */
    
    enum {
            SMT_STATE_SWITCHING,    /* entry is being used by a switching filter */
            SMT_STATE_UNUSED,       /* entry not in use */
            SMT_STATE_ERROR         /* entry is in error state */
    };
    
    struct smt_entry {
            uint16_t state;                 /* entry state */
            uint16_t idx;                   /* entry index */
            uint32_t iqid;                  /* iqid for reply to write_sme */
            struct sge_wrq *wrq;            /* queue to use for write_sme */
            uint16_t pfvf;                  /* pfvf number */
            volatile int refcnt;            /* entry reference count */
            uint8_t smac[ETHER_ADDR_LEN];   /* source MAC address */
            struct mtx lock;
    };
    
    struct smt_data {
            struct rwlock lock;
            u_int smt_size;
            struct smt_entry smtab[];
    };
    
    
    int t4_init_smt(struct adapter *, int);
    int t4_free_smt(struct smt_data *);
    struct smt_entry *t4_find_or_alloc_sme(struct smt_data *, uint8_t *);
    struct smt_entry *t4_smt_alloc_switching(struct smt_data *, uint8_t *);
    int t4_smt_set_switching(struct adapter *, struct smt_entry *,
                                            uint16_t, uint8_t *);
    int t4_write_sme(struct smt_entry *);
    int do_smt_write_rpl(struct sge_iq *, const struct rss_header *, struct mbuf *);
    
    static inline void
    t4_smt_release(struct smt_entry *e)
    {
            MPASS(e != NULL);
            if (atomic_fetchadd_int(&e->refcnt, -1) == 1) {
                    mtx_lock(&e->lock);
                    e->state = SMT_STATE_UNUSED;
                    mtx_unlock(&e->lock);
            }
    
    }
    
    int sysctl_smt(SYSCTL_HANDLER_ARGS);
    
    #endif  /* __T4_SMT_H */

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