8526571400
create a common structure to hold the metadata for the producer and the consumer, since both need essentially the same information - the head and tail values, the ring size and mask. Signed-off-by: Bruce Richardson <bruce.richardson@intel.com> Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Acked-by: Olivier Matz <olivier.matz@6wind.com>
382 lines
11 KiB
C
382 lines
11 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Derived from FreeBSD's bufring.c
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*
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**************************************************************************
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*
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* Copyright (c) 2007,2008 Kip Macy kmacy@freebsd.org
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. The name of Kip Macy nor the names of other
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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***************************************************************************/
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <stdint.h>
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#include <inttypes.h>
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#include <errno.h>
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#include <sys/queue.h>
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#include <rte_common.h>
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#include <rte_log.h>
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#include <rte_memory.h>
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#include <rte_memzone.h>
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#include <rte_malloc.h>
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#include <rte_launch.h>
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#include <rte_eal.h>
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#include <rte_eal_memconfig.h>
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#include <rte_atomic.h>
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#include <rte_per_lcore.h>
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#include <rte_lcore.h>
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#include <rte_branch_prediction.h>
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#include <rte_errno.h>
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#include <rte_string_fns.h>
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#include <rte_spinlock.h>
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#include "rte_ring.h"
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TAILQ_HEAD(rte_ring_list, rte_tailq_entry);
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static struct rte_tailq_elem rte_ring_tailq = {
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.name = RTE_TAILQ_RING_NAME,
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};
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EAL_REGISTER_TAILQ(rte_ring_tailq)
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/* true if x is a power of 2 */
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#define POWEROF2(x) ((((x)-1) & (x)) == 0)
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/* return the size of memory occupied by a ring */
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ssize_t
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rte_ring_get_memsize(unsigned count)
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{
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ssize_t sz;
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/* count must be a power of 2 */
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if ((!POWEROF2(count)) || (count > RTE_RING_SZ_MASK )) {
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RTE_LOG(ERR, RING,
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"Requested size is invalid, must be power of 2, and "
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"do not exceed the size limit %u\n", RTE_RING_SZ_MASK);
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return -EINVAL;
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}
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sz = sizeof(struct rte_ring) + count * sizeof(void *);
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sz = RTE_ALIGN(sz, RTE_CACHE_LINE_SIZE);
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return sz;
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}
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int
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rte_ring_init(struct rte_ring *r, const char *name, unsigned count,
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unsigned flags)
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{
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int ret;
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/* compilation-time checks */
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RTE_BUILD_BUG_ON((sizeof(struct rte_ring) &
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RTE_CACHE_LINE_MASK) != 0);
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RTE_BUILD_BUG_ON((offsetof(struct rte_ring, cons) &
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RTE_CACHE_LINE_MASK) != 0);
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RTE_BUILD_BUG_ON((offsetof(struct rte_ring, prod) &
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RTE_CACHE_LINE_MASK) != 0);
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#ifdef RTE_LIBRTE_RING_DEBUG
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RTE_BUILD_BUG_ON((sizeof(struct rte_ring_debug_stats) &
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RTE_CACHE_LINE_MASK) != 0);
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RTE_BUILD_BUG_ON((offsetof(struct rte_ring, stats) &
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RTE_CACHE_LINE_MASK) != 0);
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#endif
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/* init the ring structure */
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memset(r, 0, sizeof(*r));
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ret = snprintf(r->name, sizeof(r->name), "%s", name);
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if (ret < 0 || ret >= (int)sizeof(r->name))
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return -ENAMETOOLONG;
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r->flags = flags;
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r->prod.watermark = count;
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r->prod.single = !!(flags & RING_F_SP_ENQ);
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r->cons.single = !!(flags & RING_F_SC_DEQ);
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r->prod.size = r->cons.size = count;
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r->prod.mask = r->cons.mask = count-1;
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r->prod.head = r->cons.head = 0;
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r->prod.tail = r->cons.tail = 0;
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return 0;
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}
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/* create the ring */
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struct rte_ring *
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rte_ring_create(const char *name, unsigned count, int socket_id,
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unsigned flags)
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{
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char mz_name[RTE_MEMZONE_NAMESIZE];
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struct rte_ring *r;
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struct rte_tailq_entry *te;
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const struct rte_memzone *mz;
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ssize_t ring_size;
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int mz_flags = 0;
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struct rte_ring_list* ring_list = NULL;
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int ret;
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ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
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ring_size = rte_ring_get_memsize(count);
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if (ring_size < 0) {
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rte_errno = ring_size;
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return NULL;
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}
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ret = snprintf(mz_name, sizeof(mz_name), "%s%s",
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RTE_RING_MZ_PREFIX, name);
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if (ret < 0 || ret >= (int)sizeof(mz_name)) {
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rte_errno = ENAMETOOLONG;
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return NULL;
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}
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te = rte_zmalloc("RING_TAILQ_ENTRY", sizeof(*te), 0);
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if (te == NULL) {
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RTE_LOG(ERR, RING, "Cannot reserve memory for tailq\n");
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rte_errno = ENOMEM;
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return NULL;
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}
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rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
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/* reserve a memory zone for this ring. If we can't get rte_config or
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* we are secondary process, the memzone_reserve function will set
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* rte_errno for us appropriately - hence no check in this this function */
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mz = rte_memzone_reserve(mz_name, ring_size, socket_id, mz_flags);
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if (mz != NULL) {
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r = mz->addr;
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/* no need to check return value here, we already checked the
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* arguments above */
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rte_ring_init(r, name, count, flags);
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te->data = (void *) r;
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r->memzone = mz;
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TAILQ_INSERT_TAIL(ring_list, te, next);
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} else {
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r = NULL;
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RTE_LOG(ERR, RING, "Cannot reserve memory\n");
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rte_free(te);
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}
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rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
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return r;
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}
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/* free the ring */
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void
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rte_ring_free(struct rte_ring *r)
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{
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struct rte_ring_list *ring_list = NULL;
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struct rte_tailq_entry *te;
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if (r == NULL)
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return;
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/*
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* Ring was not created with rte_ring_create,
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* therefore, there is no memzone to free.
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*/
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if (r->memzone == NULL) {
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RTE_LOG(ERR, RING, "Cannot free ring (not created with rte_ring_create()");
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return;
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}
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if (rte_memzone_free(r->memzone) != 0) {
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RTE_LOG(ERR, RING, "Cannot free memory\n");
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return;
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}
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ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
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rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
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/* find out tailq entry */
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TAILQ_FOREACH(te, ring_list, next) {
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if (te->data == (void *) r)
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break;
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}
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if (te == NULL) {
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rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
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return;
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}
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TAILQ_REMOVE(ring_list, te, next);
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rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
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rte_free(te);
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}
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/*
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* change the high water mark. If *count* is 0, water marking is
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* disabled
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*/
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int
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rte_ring_set_water_mark(struct rte_ring *r, unsigned count)
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{
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if (count >= r->prod.size)
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return -EINVAL;
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/* if count is 0, disable the watermarking */
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if (count == 0)
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count = r->prod.size;
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r->prod.watermark = count;
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return 0;
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}
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/* dump the status of the ring on the console */
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void
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rte_ring_dump(FILE *f, const struct rte_ring *r)
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{
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#ifdef RTE_LIBRTE_RING_DEBUG
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struct rte_ring_debug_stats sum;
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unsigned lcore_id;
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#endif
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fprintf(f, "ring <%s>@%p\n", r->name, r);
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fprintf(f, " flags=%x\n", r->flags);
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fprintf(f, " size=%"PRIu32"\n", r->prod.size);
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fprintf(f, " ct=%"PRIu32"\n", r->cons.tail);
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fprintf(f, " ch=%"PRIu32"\n", r->cons.head);
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fprintf(f, " pt=%"PRIu32"\n", r->prod.tail);
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fprintf(f, " ph=%"PRIu32"\n", r->prod.head);
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fprintf(f, " used=%u\n", rte_ring_count(r));
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fprintf(f, " avail=%u\n", rte_ring_free_count(r));
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if (r->prod.watermark == r->prod.size)
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fprintf(f, " watermark=0\n");
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else
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fprintf(f, " watermark=%"PRIu32"\n", r->prod.watermark);
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/* sum and dump statistics */
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#ifdef RTE_LIBRTE_RING_DEBUG
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memset(&sum, 0, sizeof(sum));
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for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
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sum.enq_success_bulk += r->stats[lcore_id].enq_success_bulk;
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sum.enq_success_objs += r->stats[lcore_id].enq_success_objs;
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sum.enq_quota_bulk += r->stats[lcore_id].enq_quota_bulk;
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sum.enq_quota_objs += r->stats[lcore_id].enq_quota_objs;
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sum.enq_fail_bulk += r->stats[lcore_id].enq_fail_bulk;
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sum.enq_fail_objs += r->stats[lcore_id].enq_fail_objs;
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sum.deq_success_bulk += r->stats[lcore_id].deq_success_bulk;
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sum.deq_success_objs += r->stats[lcore_id].deq_success_objs;
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sum.deq_fail_bulk += r->stats[lcore_id].deq_fail_bulk;
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sum.deq_fail_objs += r->stats[lcore_id].deq_fail_objs;
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}
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fprintf(f, " size=%"PRIu32"\n", r->prod.size);
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fprintf(f, " enq_success_bulk=%"PRIu64"\n", sum.enq_success_bulk);
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fprintf(f, " enq_success_objs=%"PRIu64"\n", sum.enq_success_objs);
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fprintf(f, " enq_quota_bulk=%"PRIu64"\n", sum.enq_quota_bulk);
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fprintf(f, " enq_quota_objs=%"PRIu64"\n", sum.enq_quota_objs);
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fprintf(f, " enq_fail_bulk=%"PRIu64"\n", sum.enq_fail_bulk);
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fprintf(f, " enq_fail_objs=%"PRIu64"\n", sum.enq_fail_objs);
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fprintf(f, " deq_success_bulk=%"PRIu64"\n", sum.deq_success_bulk);
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fprintf(f, " deq_success_objs=%"PRIu64"\n", sum.deq_success_objs);
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fprintf(f, " deq_fail_bulk=%"PRIu64"\n", sum.deq_fail_bulk);
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fprintf(f, " deq_fail_objs=%"PRIu64"\n", sum.deq_fail_objs);
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#else
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fprintf(f, " no statistics available\n");
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#endif
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}
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/* dump the status of all rings on the console */
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void
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rte_ring_list_dump(FILE *f)
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{
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const struct rte_tailq_entry *te;
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struct rte_ring_list *ring_list;
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ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
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rte_rwlock_read_lock(RTE_EAL_TAILQ_RWLOCK);
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TAILQ_FOREACH(te, ring_list, next) {
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rte_ring_dump(f, (struct rte_ring *) te->data);
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}
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rte_rwlock_read_unlock(RTE_EAL_TAILQ_RWLOCK);
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}
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/* search a ring from its name */
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struct rte_ring *
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rte_ring_lookup(const char *name)
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{
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struct rte_tailq_entry *te;
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struct rte_ring *r = NULL;
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struct rte_ring_list *ring_list;
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ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
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rte_rwlock_read_lock(RTE_EAL_TAILQ_RWLOCK);
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TAILQ_FOREACH(te, ring_list, next) {
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r = (struct rte_ring *) te->data;
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if (strncmp(name, r->name, RTE_RING_NAMESIZE) == 0)
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break;
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}
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rte_rwlock_read_unlock(RTE_EAL_TAILQ_RWLOCK);
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if (te == NULL) {
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rte_errno = ENOENT;
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return NULL;
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}
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return r;
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}
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