1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2017 Intel Corporation
5 #ifndef _RTE_DIST_PRIV_H_
6 #define _RTE_DIST_PRIV_H_
12 * The distributor is a component which is designed to pass packets
13 * one-at-a-time to workers, with dynamic load balancing.
21 #define RTE_DISTRIB_PREFIX "DT_"
24 * We will use the bottom four bits of pointer for flags, shifting out
25 * the top four bits to make room (since a 64-bit pointer actually only uses
26 * 48 bits). An arithmetic-right-shift will then appropriately restore the
27 * original pointer value with proper sign extension into the top bits.
29 #define RTE_DISTRIB_FLAG_BITS 4
30 #define RTE_DISTRIB_FLAGS_MASK (0x0F)
31 #define RTE_DISTRIB_NO_BUF 0 /**< empty flags: no buffer requested */
32 #define RTE_DISTRIB_GET_BUF (1) /**< worker requests a buffer, returns old */
33 #define RTE_DISTRIB_RETURN_BUF (2) /**< worker returns a buffer, no request */
34 #define RTE_DISTRIB_VALID_BUF (4) /**< set if bufptr contains ptr */
36 #define RTE_DISTRIB_BACKLOG_SIZE 8
37 #define RTE_DISTRIB_BACKLOG_MASK (RTE_DISTRIB_BACKLOG_SIZE - 1)
39 #define RTE_DISTRIB_MAX_RETURNS 128
40 #define RTE_DISTRIB_RETURNS_MASK (RTE_DISTRIB_MAX_RETURNS - 1)
43 * Maximum number of workers allowed.
44 * Be aware of increasing the limit, becaus it is limited by how we track
45 * in-flight tags. See in_flight_bitmask and rte_distributor_process
47 #define RTE_DISTRIB_MAX_WORKERS 64
49 #define RTE_DISTRIBUTOR_NAMESIZE 32 /**< Length of name for instance */
52 * Buffer structure used to pass the pointer data between cores. This is cache
53 * line aligned, but to improve performance and prevent adjacent cache-line
54 * prefetches of buffers for other workers, e.g. when worker 1's buffer is on
55 * the next cache line to worker 0, we pad this out to three cache lines.
56 * Only 64-bits of the memory is actually used though.
58 union rte_distributor_buffer_v20 {
59 volatile int64_t bufptr64;
60 char pad[RTE_CACHE_LINE_SIZE*3];
61 } __rte_cache_aligned;
64 * Transfer up to 8 mbufs at a time to/from workers, and
65 * flow matching algorithm optimized for 8 flow IDs at a time
67 #define RTE_DIST_BURST_SIZE 8
69 struct rte_distributor_backlog {
72 int64_t pkts[RTE_DIST_BURST_SIZE] __rte_cache_aligned;
73 uint16_t *tags; /* will point to second cacheline of inflights */
74 } __rte_cache_aligned;
77 struct rte_distributor_returned_pkts {
80 struct rte_mbuf *mbufs[RTE_DISTRIB_MAX_RETURNS];
83 struct rte_distributor_v20 {
84 TAILQ_ENTRY(rte_distributor_v20) next; /**< Next in list. */
86 char name[RTE_DISTRIBUTOR_NAMESIZE]; /**< Name of the ring. */
87 unsigned int num_workers; /**< Number of workers polling */
89 uint32_t in_flight_tags[RTE_DISTRIB_MAX_WORKERS];
90 /**< Tracks the tag being processed per core */
91 uint64_t in_flight_bitmask;
92 /**< on/off bits for in-flight tags.
93 * Note that if RTE_DISTRIB_MAX_WORKERS is larger than 64 then
94 * the bitmask has to expand.
97 struct rte_distributor_backlog backlog[RTE_DISTRIB_MAX_WORKERS];
99 union rte_distributor_buffer_v20 bufs[RTE_DISTRIB_MAX_WORKERS];
101 struct rte_distributor_returned_pkts returns;
104 /* All different signature compare functions */
105 enum rte_distributor_match_function {
106 RTE_DIST_MATCH_SCALAR = 0,
107 RTE_DIST_MATCH_VECTOR,
108 RTE_DIST_NUM_MATCH_FNS
112 * Buffer structure used to pass the pointer data between cores. This is cache
113 * line aligned, but to improve performance and prevent adjacent cache-line
114 * prefetches of buffers for other workers, e.g. when worker 1's buffer is on
115 * the next cache line to worker 0, we pad this out to two cache lines.
116 * We can pass up to 8 mbufs at a time in one cacheline.
117 * There is a separate cacheline for returns in the burst API.
119 struct rte_distributor_buffer {
120 volatile int64_t bufptr64[RTE_DIST_BURST_SIZE]
121 __rte_cache_aligned; /* <= outgoing to worker */
123 int64_t pad1 __rte_cache_aligned; /* <= one cache line */
125 volatile int64_t retptr64[RTE_DIST_BURST_SIZE]
126 __rte_cache_aligned; /* <= incoming from worker */
128 int64_t pad2 __rte_cache_aligned; /* <= one cache line */
130 int count __rte_cache_aligned; /* <= number of current mbufs */
133 struct rte_distributor {
134 TAILQ_ENTRY(rte_distributor) next; /**< Next in list. */
136 char name[RTE_DISTRIBUTOR_NAMESIZE]; /**< Name of the ring. */
137 unsigned int num_workers; /**< Number of workers polling */
138 unsigned int alg_type; /**< Number of alg types */
141 * First cache line in the this array are the tags inflight
142 * on the worker core. Second cache line are the backlog
143 * that are going to go to the worker core.
145 uint16_t in_flight_tags[RTE_DISTRIB_MAX_WORKERS][RTE_DIST_BURST_SIZE*2]
148 struct rte_distributor_backlog backlog[RTE_DISTRIB_MAX_WORKERS]
151 struct rte_distributor_buffer bufs[RTE_DISTRIB_MAX_WORKERS];
153 struct rte_distributor_returned_pkts returns;
155 enum rte_distributor_match_function dist_match_fn;
157 struct rte_distributor_v20 *d_v20;
161 find_match_scalar(struct rte_distributor *d,
163 uint16_t *output_ptr);
166 find_match_vec(struct rte_distributor *d,
168 uint16_t *output_ptr);