LXR dpdk/lib/ip_frag/rte_ip_frag

   1/* SPDX-License-Identifier: BSD-3-Clause
   2 * Copyright(c) 2010-2014 Intel Corporation
   3 */
   4
   5#include <stddef.h>
   6#include <stdio.h>
   7
   8#include <rte_log.h>
   9
  10#include "ip_frag_common.h"
  11
  12#define IP_FRAG_HASH_FNUM       2
  13
  14/* free mbufs from death row */
  15void
  16rte_ip_frag_free_death_row(struct rte_ip_frag_death_row *dr,
  17                uint32_t prefetch)
  18{
  19        uint32_t i, k, n;
  20
  21        k = RTE_MIN(prefetch, dr->cnt);
  22        n = dr->cnt;
  23
  24        for (i = 0; i != k; i++)
  25                rte_prefetch0(dr->row[i]);
  26
  27        for (i = 0; i != n - k; i++) {
  28                rte_prefetch0(dr->row[i + k]);
  29                rte_pktmbuf_free(dr->row[i]);
  30        }
  31
  32        for (; i != n; i++)
  33                rte_pktmbuf_free(dr->row[i]);
  34
  35        dr->cnt = 0;
  36}
  37
  38/* create fragmentation table */
  39struct rte_ip_frag_tbl *
  40rte_ip_frag_table_create(uint32_t bucket_num, uint32_t bucket_entries,
  41        uint32_t max_entries, uint64_t max_cycles, int socket_id)
  42{
  43        struct rte_ip_frag_tbl *tbl;
  44        size_t sz;
  45        uint64_t nb_entries;
  46
  47        nb_entries = rte_align32pow2(bucket_num);
  48        nb_entries *= bucket_entries;
  49        nb_entries *= IP_FRAG_HASH_FNUM;
  50
  51        /* check input parameters. */
  52        if (rte_is_power_of_2(bucket_entries) == 0 ||
  53                        nb_entries > UINT32_MAX || nb_entries == 0 ||
  54                        nb_entries < max_entries) {
  55                RTE_LOG(ERR, USER1, "%s: invalid input parameter\n", __func__);
  56                return NULL;
  57        }
  58
  59        sz = sizeof (*tbl) + nb_entries * sizeof (tbl->pkt[0]);
  60        if ((tbl = rte_zmalloc_socket(__func__, sz, RTE_CACHE_LINE_SIZE,
  61                        socket_id)) == NULL) {
  62                RTE_LOG(ERR, USER1,
  63                        "%s: allocation of %zu bytes at socket %d failed do\n",
  64                        __func__, sz, socket_id);
  65                return NULL;
  66        }
  67
  68        RTE_LOG(INFO, USER1, "%s: allocated of %zu bytes at socket %d\n",
  69                __func__, sz, socket_id);
  70
  71        tbl->max_cycles = max_cycles;
  72        tbl->max_entries = max_entries;
  73        tbl->nb_entries = (uint32_t)nb_entries;
  74        tbl->nb_buckets = bucket_num;
  75        tbl->bucket_entries = bucket_entries;
  76        tbl->entry_mask = (tbl->nb_entries - 1) & ~(tbl->bucket_entries  - 1);
  77
  78        TAILQ_INIT(&(tbl->lru));
  79        return tbl;
  80}
  81
  82/* delete fragmentation table */
  83void
  84rte_ip_frag_table_destroy(struct rte_ip_frag_tbl *tbl)
  85{
  86        struct ip_frag_pkt *fp;
  87
  88        TAILQ_FOREACH(fp, &tbl->lru, lru) {
  89                ip_frag_free_immediate(fp);
  90        }
  91
  92        rte_free(tbl);
  93}
  94
  95/* dump frag table statistics to file */
  96void
  97rte_ip_frag_table_statistics_dump(FILE *f, const struct rte_ip_frag_tbl *tbl)
  98{
  99        uint64_t fail_total, fail_nospace;
 100
 101        fail_total = tbl->stat.fail_total;
 102        fail_nospace = tbl->stat.fail_nospace;
 103
 104        fprintf(f, "max entries:\t%u;\n"
 105                "entries in use:\t%u;\n"
 106                "finds/inserts:\t%" PRIu64 ";\n"
 107                "entries added:\t%" PRIu64 ";\n"
 108                "entries deleted by timeout:\t%" PRIu64 ";\n"
 109                "entries reused by timeout:\t%" PRIu64 ";\n"
 110                "total add failures:\t%" PRIu64 ";\n"
 111                "add no-space failures:\t%" PRIu64 ";\n"
 112                "add hash-collisions failures:\t%" PRIu64 ";\n",
 113                tbl->max_entries,
 114                tbl->use_entries,
 115                tbl->stat.find_num,
 116                tbl->stat.add_num,
 117                tbl->stat.del_num,
 118                tbl->stat.reuse_num,
 119                fail_total,
 120                fail_nospace,
 121                fail_total - fail_nospace);
 122}
 123
 124/* Delete expired fragments */
 125void
 126rte_ip_frag_table_del_expired_entries(struct rte_ip_frag_tbl *tbl,
 127        struct rte_ip_frag_death_row *dr, uint64_t tms)
 128{
 129        uint64_t max_cycles;
 130        struct ip_frag_pkt *fp;
 131
 132        max_cycles = tbl->max_cycles;
 133
 134        TAILQ_FOREACH(fp, &tbl->lru, lru)
 135                if (max_cycles + fp->start < tms) {
 136                        /* check that death row has enough space */
 137                        if (RTE_IP_FRAG_DEATH_ROW_MBUF_LEN - dr->cnt >=
 138                                        fp->last_idx)
 139                                ip_frag_tbl_del(tbl, dr, fp);
 140                        else
 141                                return;
 142                } else
 143                        return;
 144}
 145