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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Intel Corporation nor the names of its
* 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.
*/
#ifndef _RTE_DISTRIBUTE_H_
#define _RTE_DISTRIBUTE_H_
/**
* @file
* RTE distributor
*
* The distributor is a component which is designed to pass packets
* one-at-a-time to workers, with dynamic load balancing.
*/
#ifdef __cplusplus
extern "C" {
#endif
#define RTE_DISTRIBUTOR_NAMESIZE 32 /**< Length of name for instance */
struct rte_distributor;
struct rte_mbuf;
/**
* Function to create a new distributor instance
*
* Reserves the memory needed for the distributor operation and
* initializes the distributor to work with the configured number of workers.
*
* @param name
* The name to be given to the distributor instance.
* @param socket_id
* The NUMA node on which the memory is to be allocated
* @param num_workers
* The maximum number of workers that will request packets from this
* distributor
* @return
* The newly created distributor instance
*/
struct rte_distributor *
rte_distributor_create(const char *name, unsigned socket_id,
unsigned num_workers);
/* *** APIS to be called on the distributor lcore *** */
/*
* The following APIs are the public APIs which are designed for use on a
* single lcore which acts as the distributor lcore for a given distributor
* instance. These functions cannot be called on multiple cores simultaneously
* without using locking to protect access to the internals of the distributor.
*
* NOTE: a given lcore cannot act as both a distributor lcore and a worker lcore
* for the same distributor instance, otherwise deadlock will result.
*/
/**
* Process a set of packets by distributing them among workers that request
* packets. The distributor will ensure that no two packets that have the
* same flow id, or tag, in the mbuf will be procesed at the same time.
*
* The user is advocated to set tag for each mbuf before calling this function.
* If user doesn't set the tag, the tag value can be various values depending on
* driver implementation and configuration.
*
* This is not multi-thread safe and should only be called on a single lcore.
*
* @param d
* The distributor instance to be used
* @param mbufs
* The mbufs to be distributed
* @param num_mbufs
* The number of mbufs in the mbufs array
* @return
* The number of mbufs processed.
*/
int
rte_distributor_process(struct rte_distributor *d,
struct rte_mbuf **mbufs, unsigned num_mbufs);
/**
* Get a set of mbufs that have been returned to the distributor by workers
*
* This should only be called on the same lcore as rte_distributor_process()
*
* @param d
* The distributor instance to be used
* @param mbufs
* The mbufs pointer array to be filled in
* @param max_mbufs
* The size of the mbufs array
* @return
* The number of mbufs returned in the mbufs array.
*/
int
rte_distributor_returned_pkts(struct rte_distributor *d,
struct rte_mbuf **mbufs, unsigned max_mbufs);
/**
* Flush the distributor component, so that there are no in-flight or
* backlogged packets awaiting processing
*
* This should only be called on the same lcore as rte_distributor_process()
*
* @param d
* The distributor instance to be used
* @return
* The number of queued/in-flight packets that were completed by this call.
*/
int
rte_distributor_flush(struct rte_distributor *d);
/**
* Clears the array of returned packets used as the source for the
* rte_distributor_returned_pkts() API call.
*
* This should only be called on the same lcore as rte_distributor_process()
*
* @param d
* The distributor instance to be used
*/
void
rte_distributor_clear_returns(struct rte_distributor *d);
/* *** APIS to be called on the worker lcores *** */
/*
* The following APIs are the public APIs which are designed for use on
* multiple lcores which act as workers for a distributor. Each lcore should use
* a unique worker id when requesting packets.
*
* NOTE: a given lcore cannot act as both a distributor lcore and a worker lcore
* for the same distributor instance, otherwise deadlock will result.
*/
/**
* API called by a worker to get a new packet to process. Any previous packet
* given to the worker is assumed to have completed processing, and may be
* optionally returned to the distributor via the oldpkt parameter.
*
* @param d
* The distributor instance to be used
* @param worker_id
* The worker instance number to use - must be less that num_workers passed
* at distributor creation time.
* @param oldpkt
* The previous packet, if any, being processed by the worker
*
* @return
* A new packet to be processed by the worker thread.
*/
struct rte_mbuf *
rte_distributor_get_pkt(struct rte_distributor *d,
unsigned worker_id, struct rte_mbuf *oldpkt);
/**
* API called by a worker to return a completed packet without requesting a
* new packet, for example, because a worker thread is shutting down
*
* @param d
* The distributor instance to be used
* @param worker_id
* The worker instance number to use - must be less that num_workers passed
* at distributor creation time.
* @param mbuf
* The previous packet being processed by the worker
*/
int
rte_distributor_return_pkt(struct rte_distributor *d, unsigned worker_id,
struct rte_mbuf *mbuf);
/**
* API called by a worker to request a new packet to process.
* Any previous packet given to the worker is assumed to have completed
* processing, and may be optionally returned to the distributor via
* the oldpkt parameter.
* Unlike rte_distributor_get_pkt(), this function does not wait for a new
* packet to be provided by the distributor.
*
* NOTE: after calling this function, rte_distributor_poll_pkt() should
* be used to poll for the packet requested. The rte_distributor_get_pkt()
* API should *not* be used to try and retrieve the new packet.
*
* @param d
* The distributor instance to be used
* @param worker_id
* The worker instance number to use - must be less that num_workers passed
* at distributor creation time.
* @param oldpkt
* The previous packet, if any, being processed by the worker
*/
void
rte_distributor_request_pkt(struct rte_distributor *d,
unsigned worker_id, struct rte_mbuf *oldpkt);
/**
* API called by a worker to check for a new packet that was previously
* requested by a call to rte_distributor_request_pkt(). It does not wait
* for the new packet to be available, but returns NULL if the request has
* not yet been fulfilled by the distributor.
*
* @param d
* The distributor instance to be used
* @param worker_id
* The worker instance number to use - must be less that num_workers passed
* at distributor creation time.
*
* @return
* A new packet to be processed by the worker thread, or NULL if no
* packet is yet available.
*/
struct rte_mbuf *
rte_distributor_poll_pkt(struct rte_distributor *d,
unsigned worker_id);
#ifdef __cplusplus
}
#endif
#endif
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