mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-13 10:02:38 +00:00
db7f0b974f
and ifnet functions - add memory barriers to <machine/atomic.h> - update drivers to only conditionally define their own - add lockless producer / consumer ring buffer - remove ring buffer implementation from cxgb and update its callers - add if_transmit(struct ifnet *ifp, struct mbuf *m) to ifnet to allow drivers to efficiently manage multiple hardware queues (i.e. not serialize all packets through one ifq) - expose if_qflush to allow drivers to flush any driver managed queues This work was supported by Bitgravity Inc. and Chelsio Inc.
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/**************************************************************************
|
|
*
|
|
* Copyright (c) 2007,2008 Kip Macy kmacy@freebsd.org
|
|
* 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. The name of Kip Macy nor the names of other
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
|
|
*
|
|
*
|
|
***************************************************************************/
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/ktr.h>
|
|
#include <sys/buf_ring.h>
|
|
|
|
|
|
struct buf_ring *
|
|
buf_ring_alloc(int count, struct malloc_type *type, int flags, struct mtx *lock)
|
|
{
|
|
struct buf_ring *br;
|
|
|
|
KASSERT(powerof2(count), ("buf ring must be size power of 2"));
|
|
|
|
br = malloc(sizeof(struct buf_ring) + count*sizeof(caddr_t),
|
|
type, flags|M_ZERO);
|
|
if (br == NULL)
|
|
return (NULL);
|
|
#ifdef DEBUG_BUFRING
|
|
br->br_lock = lock;
|
|
#endif
|
|
br->br_prod_size = br->br_cons_size = count;
|
|
br->br_prod_mask = br->br_cons_mask = count-1;
|
|
br->br_prod_head = br->br_cons_head = 0;
|
|
br->br_prod_tail = br->br_cons_tail = 0;
|
|
|
|
return (br);
|
|
}
|
|
|
|
void
|
|
buf_ring_free(struct buf_ring *br, struct malloc_type *type)
|
|
{
|
|
free(br, type);
|
|
}
|