1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
5 #ifndef _RTE_DISTRIB_V20_H_
6 #define _RTE_DISTRIB_V20_H_
12 * The distributor is a component which is designed to pass packets
13 * one-at-a-time to workers, with dynamic load balancing.
20 #define RTE_DISTRIBUTOR_NAMESIZE 32 /**< Length of name for instance */
22 struct rte_distributor_v20;
26 * Function to create a new distributor instance
28 * Reserves the memory needed for the distributor operation and
29 * initializes the distributor to work with the configured number of workers.
32 * The name to be given to the distributor instance.
34 * The NUMA node on which the memory is to be allocated
36 * The maximum number of workers that will request packets from this
39 * The newly created distributor instance
41 struct rte_distributor_v20 *
42 rte_distributor_create_v20(const char *name, unsigned int socket_id,
43 unsigned int num_workers);
45 /* *** APIS to be called on the distributor lcore *** */
47 * The following APIs are the public APIs which are designed for use on a
48 * single lcore which acts as the distributor lcore for a given distributor
49 * instance. These functions cannot be called on multiple cores simultaneously
50 * without using locking to protect access to the internals of the distributor.
52 * NOTE: a given lcore cannot act as both a distributor lcore and a worker lcore
53 * for the same distributor instance, otherwise deadlock will result.
57 * Process a set of packets by distributing them among workers that request
58 * packets. The distributor will ensure that no two packets that have the
59 * same flow id, or tag, in the mbuf will be processed at the same time.
61 * The user is advocated to set tag for each mbuf before calling this function.
62 * If user doesn't set the tag, the tag value can be various values depending on
63 * driver implementation and configuration.
65 * This is not multi-thread safe and should only be called on a single lcore.
68 * The distributor instance to be used
70 * The mbufs to be distributed
72 * The number of mbufs in the mbufs array
74 * The number of mbufs processed.
77 rte_distributor_process_v20(struct rte_distributor_v20 *d,
78 struct rte_mbuf **mbufs, unsigned int num_mbufs);
81 * Get a set of mbufs that have been returned to the distributor by workers
83 * This should only be called on the same lcore as rte_distributor_process()
86 * The distributor instance to be used
88 * The mbufs pointer array to be filled in
90 * The size of the mbufs array
92 * The number of mbufs returned in the mbufs array.
95 rte_distributor_returned_pkts_v20(struct rte_distributor_v20 *d,
96 struct rte_mbuf **mbufs, unsigned int max_mbufs);
99 * Flush the distributor component, so that there are no in-flight or
100 * backlogged packets awaiting processing
102 * This should only be called on the same lcore as rte_distributor_process()
105 * The distributor instance to be used
107 * The number of queued/in-flight packets that were completed by this call.
110 rte_distributor_flush_v20(struct rte_distributor_v20 *d);
113 * Clears the array of returned packets used as the source for the
114 * rte_distributor_returned_pkts() API call.
116 * This should only be called on the same lcore as rte_distributor_process()
119 * The distributor instance to be used
122 rte_distributor_clear_returns_v20(struct rte_distributor_v20 *d);
124 /* *** APIS to be called on the worker lcores *** */
126 * The following APIs are the public APIs which are designed for use on
127 * multiple lcores which act as workers for a distributor. Each lcore should use
128 * a unique worker id when requesting packets.
130 * NOTE: a given lcore cannot act as both a distributor lcore and a worker lcore
131 * for the same distributor instance, otherwise deadlock will result.
135 * API called by a worker to get a new packet to process. Any previous packet
136 * given to the worker is assumed to have completed processing, and may be
137 * optionally returned to the distributor via the oldpkt parameter.
140 * The distributor instance to be used
142 * The worker instance number to use - must be less that num_workers passed
143 * at distributor creation time.
145 * The previous packet, if any, being processed by the worker
148 * A new packet to be processed by the worker thread.
151 rte_distributor_get_pkt_v20(struct rte_distributor_v20 *d,
152 unsigned int worker_id, struct rte_mbuf *oldpkt);
155 * API called by a worker to return a completed packet without requesting a
156 * new packet, for example, because a worker thread is shutting down
159 * The distributor instance to be used
161 * The worker instance number to use - must be less that num_workers passed
162 * at distributor creation time.
164 * The previous packet being processed by the worker
167 rte_distributor_return_pkt_v20(struct rte_distributor_v20 *d,
168 unsigned int worker_id, struct rte_mbuf *mbuf);
171 * API called by a worker to request a new packet to process.
172 * Any previous packet given to the worker is assumed to have completed
173 * processing, and may be optionally returned to the distributor via
174 * the oldpkt parameter.
175 * Unlike rte_distributor_get_pkt(), this function does not wait for a new
176 * packet to be provided by the distributor.
178 * NOTE: after calling this function, rte_distributor_poll_pkt() should
179 * be used to poll for the packet requested. The rte_distributor_get_pkt()
180 * API should *not* be used to try and retrieve the new packet.
183 * The distributor instance to be used
185 * The worker instance number to use - must be less that num_workers passed
186 * at distributor creation time.
188 * The previous packet, if any, being processed by the worker
191 rte_distributor_request_pkt_v20(struct rte_distributor_v20 *d,
192 unsigned int worker_id, struct rte_mbuf *oldpkt);
195 * API called by a worker to check for a new packet that was previously
196 * requested by a call to rte_distributor_request_pkt(). It does not wait
197 * for the new packet to be available, but returns NULL if the request has
198 * not yet been fulfilled by the distributor.
201 * The distributor instance to be used
203 * The worker instance number to use - must be less that num_workers passed
204 * at distributor creation time.
207 * A new packet to be processed by the worker thread, or NULL if no
208 * packet is yet available.
211 rte_distributor_poll_pkt_v20(struct rte_distributor_v20 *d,
212 unsigned int worker_id);