ceph/src/spdk/dpdk/lib/librte_distributor/rte_distributor_v20.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #ifndef _RTE_DISTRIB_V20_H_
   6 #define _RTE_DISTRIB_V20_H_
   7
   8 /**
   9  * @file
  10  * RTE distributor
  11  *
  12  * The distributor is a component which is designed to pass packets
  13  * one-at-a-time to workers, with dynamic load balancing.
  14  */
  15
  16 #ifdef __cplusplus
  17 extern "C" {
  18 #endif
  19
  20 #define RTE_DISTRIBUTOR_NAMESIZE 32 /**< Length of name for instance */
  21
  22 struct rte_distributor_v20;
  23 struct rte_mbuf;
  24
  25 /**
  26  * Function to create a new distributor instance
  27  *
  28  * Reserves the memory needed for the distributor operation and
  29  * initializes the distributor to work with the configured number of workers.
  30  *
  31  * @param name
  32  *   The name to be given to the distributor instance.
  33  * @param socket_id
  34  *   The NUMA node on which the memory is to be allocated
  35  * @param num_workers
  36  *   The maximum number of workers that will request packets from this
  37  *   distributor
  38  * @return
  39  *   The newly created distributor instance
  40  */
  41 struct rte_distributor_v20 *
  42 rte_distributor_create_v20(const char *name, unsigned int socket_id,
  43                 unsigned int num_workers);
  44
  45 /*  *** APIS to be called on the distributor lcore ***  */
  46 /*
  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.
  51  *
  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.
  54  */
  55
  56 /**
  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.
  60  *
  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.
  64  *
  65  * This is not multi-thread safe and should only be called on a single lcore.
  66  *
  67  * @param d
  68  *   The distributor instance to be used
  69  * @param mbufs
  70  *   The mbufs to be distributed
  71  * @param num_mbufs
  72  *   The number of mbufs in the mbufs array
  73  * @return
  74  *   The number of mbufs processed.
  75  */
  76 int
  77 rte_distributor_process_v20(struct rte_distributor_v20 *d,
  78                 struct rte_mbuf **mbufs, unsigned int num_mbufs);
  79
  80 /**
  81  * Get a set of mbufs that have been returned to the distributor by workers
  82  *
  83  * This should only be called on the same lcore as rte_distributor_process()
  84  *
  85  * @param d
  86  *   The distributor instance to be used
  87  * @param mbufs
  88  *   The mbufs pointer array to be filled in
  89  * @param max_mbufs
  90  *   The size of the mbufs array
  91  * @return
  92  *   The number of mbufs returned in the mbufs array.
  93  */
  94 int
  95 rte_distributor_returned_pkts_v20(struct rte_distributor_v20 *d,
  96                 struct rte_mbuf **mbufs, unsigned int max_mbufs);
  97
  98 /**
  99  * Flush the distributor component, so that there are no in-flight or
 100  * backlogged packets awaiting processing
 101  *
 102  * This should only be called on the same lcore as rte_distributor_process()
 103  *
 104  * @param d
 105  *   The distributor instance to be used
 106  * @return
 107  *   The number of queued/in-flight packets that were completed by this call.
 108  */
 109 int
 110 rte_distributor_flush_v20(struct rte_distributor_v20 *d);
 111
 112 /**
 113  * Clears the array of returned packets used as the source for the
 114  * rte_distributor_returned_pkts() API call.
 115  *
 116  * This should only be called on the same lcore as rte_distributor_process()
 117  *
 118  * @param d
 119  *   The distributor instance to be used
 120  */
 121 void
 122 rte_distributor_clear_returns_v20(struct rte_distributor_v20 *d);
 123
 124 /*  *** APIS to be called on the worker lcores ***  */
 125 /*
 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.
 129  *
 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.
 132  */
 133
 134 /**
 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.
 138  *
 139  * @param d
 140  *   The distributor instance to be used
 141  * @param worker_id
 142  *   The worker instance number to use - must be less that num_workers passed
 143  *   at distributor creation time.
 144  * @param oldpkt
 145  *   The previous packet, if any, being processed by the worker
 146  *
 147  * @return
 148  *   A new packet to be processed by the worker thread.
 149  */
 150 struct rte_mbuf *
 151 rte_distributor_get_pkt_v20(struct rte_distributor_v20 *d,
 152                 unsigned int worker_id, struct rte_mbuf *oldpkt);
 153
 154 /**
 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
 157  *
 158  * @param d
 159  *   The distributor instance to be used
 160  * @param worker_id
 161  *   The worker instance number to use - must be less that num_workers passed
 162  *   at distributor creation time.
 163  * @param mbuf
 164  *   The previous packet being processed by the worker
 165  */
 166 int
 167 rte_distributor_return_pkt_v20(struct rte_distributor_v20 *d,
 168                 unsigned int worker_id, struct rte_mbuf *mbuf);
 169
 170 /**
 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.
 177  *
 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.
 181  *
 182  * @param d
 183  *   The distributor instance to be used
 184  * @param worker_id
 185  *   The worker instance number to use - must be less that num_workers passed
 186  *   at distributor creation time.
 187  * @param oldpkt
 188  *   The previous packet, if any, being processed by the worker
 189  */
 190 void
 191 rte_distributor_request_pkt_v20(struct rte_distributor_v20 *d,
 192                 unsigned int worker_id, struct rte_mbuf *oldpkt);
 193
 194 /**
 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.
 199  *
 200  * @param d
 201  *   The distributor instance to be used
 202  * @param worker_id
 203  *   The worker instance number to use - must be less that num_workers passed
 204  *   at distributor creation time.
 205  *
 206  * @return
 207  *   A new packet to be processed by the worker thread, or NULL if no
 208  *   packet is yet available.
 209  */
 210 struct rte_mbuf *
 211 rte_distributor_poll_pkt_v20(struct rte_distributor_v20 *d,
 212                 unsigned int worker_id);
 213
 214 #ifdef __cplusplus
 215 }
 216 #endif
 217
 218 #endif