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      1 /*	$NetBSD: pktqueue.h,v 1.8 2022/09/02 05:50:36 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Mindaugas Rasiukevicius.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _NET_PKTQUEUE_H_
     33 #define _NET_PKTQUEUE_H_
     34 
     35 #if !defined(_KERNEL)
     36 #error "not supposed to be exposed to userland."
     37 #endif
     38 
     39 #include <sys/sysctl.h>
     40 
     41 struct mbuf;
     42 
     43 typedef struct pktqueue pktqueue_t;
     44 
     45 typedef enum { PKTQ_MAXLEN, PKTQ_NITEMS, PKTQ_DROPS } pktq_count_t;
     46 
     47 typedef uint32_t (*pktq_rps_hash_func_t)(const struct mbuf *);
     48 #define PKTQ_RPS_HASH_NAME_LEN 32
     49 
     50 pktqueue_t *	pktq_create(size_t, void (*)(void *), void *);
     51 void		pktq_destroy(pktqueue_t *);
     52 
     53 bool		pktq_enqueue(pktqueue_t *, struct mbuf *, const u_int);
     54 struct mbuf *	pktq_dequeue(pktqueue_t *);
     55 void		pktq_barrier(pktqueue_t *);
     56 void		pktq_ifdetach(void);
     57 void		pktq_flush(pktqueue_t *);
     58 int		pktq_set_maxlen(pktqueue_t *, size_t);
     59 
     60 uint32_t	pktq_rps_hash(const pktq_rps_hash_func_t *,
     61 		    const struct mbuf *);
     62 extern const pktq_rps_hash_func_t	pktq_rps_hash_default;
     63 
     64 void		pktq_sysctl_setup(pktqueue_t *, struct sysctllog **,
     65 		    const struct sysctlnode *, const int);
     66 
     67 int		sysctl_pktq_rps_hash_handler(SYSCTLFN_PROTO);
     68 
     69 #endif
     70