ceph/src/spdk/dpdk/drivers/net/cxgbe/clip_tbl.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Chelsio Communications.
   3  * All rights reserved.
   4  */
   5
   6 #include "common.h"
   7 #include "clip_tbl.h"
   8
   9 /**
  10  * Allocate clip entry in HW with associated IPV4/IPv6 address
  11  */
  12 static int clip6_get_mbox(const struct rte_eth_dev *dev, const u32 *lip)
  13 {
  14         struct adapter *adap = ethdev2adap(dev);
  15         struct fw_clip_cmd c;
  16         u64 hi = ((u64)lip[1]) << 32 | lip[0];
  17         u64 lo = ((u64)lip[3]) << 32 | lip[2];
  18
  19         memset(&c, 0, sizeof(c));
  20         c.op_to_write = cpu_to_be32(V_FW_CMD_OP(FW_CLIP_CMD) |
  21                                     F_FW_CMD_REQUEST | F_FW_CMD_WRITE);
  22         c.alloc_to_len16 = cpu_to_be32(F_FW_CLIP_CMD_ALLOC | FW_LEN16(c));
  23         c.ip_hi = hi;
  24         c.ip_lo = lo;
  25         return t4_wr_mbox_meat(adap, adap->mbox, &c, sizeof(c), &c, false);
  26 }
  27
  28 /**
  29  * Delete clip entry in HW having the associated IPV4/IPV6 address
  30  */
  31 static int clip6_release_mbox(const struct rte_eth_dev *dev, const u32 *lip)
  32 {
  33         struct adapter *adap = ethdev2adap(dev);
  34         struct fw_clip_cmd c;
  35         u64 hi = ((u64)lip[1]) << 32 | lip[0];
  36         u64 lo = ((u64)lip[3]) << 32 | lip[2];
  37
  38         memset(&c, 0, sizeof(c));
  39         c.op_to_write = cpu_to_be32(V_FW_CMD_OP(FW_CLIP_CMD) |
  40                                     F_FW_CMD_REQUEST | F_FW_CMD_READ);
  41         c.alloc_to_len16 = cpu_to_be32(F_FW_CLIP_CMD_FREE | FW_LEN16(c));
  42         c.ip_hi = hi;
  43         c.ip_lo = lo;
  44         return t4_wr_mbox_meat(adap, adap->mbox, &c, sizeof(c), &c, false);
  45 }
  46
  47 /**
  48  * cxgbe_clip_release - Release associated CLIP entry
  49  * @ce: clip entry to release
  50  *
  51  * Releases ref count and frees up a clip entry from CLIP table
  52  */
  53 void cxgbe_clip_release(struct rte_eth_dev *dev, struct clip_entry *ce)
  54 {
  55         int ret;
  56
  57         t4_os_lock(&ce->lock);
  58         if (rte_atomic32_dec_and_test(&ce->refcnt)) {
  59                 ret = clip6_release_mbox(dev, ce->addr);
  60                 if (ret)
  61                         dev_debug(adap, "CLIP FW DEL CMD failed: %d", ret);
  62         }
  63         t4_os_unlock(&ce->lock);
  64 }
  65
  66 /**
  67  * find_or_alloc_clipe - Find/Allocate a free CLIP entry
  68  * @c: CLIP table
  69  * @lip: IPV4/IPV6 address to compare/add
  70  * Returns pointer to the IPV4/IPV6 entry found/created
  71  *
  72  * Finds/Allocates an CLIP entry to be used for a filter rule.
  73  */
  74 static struct clip_entry *find_or_alloc_clipe(struct clip_tbl *c,
  75                                               const u32 *lip)
  76 {
  77         struct clip_entry *end, *e;
  78         struct clip_entry *first_free = NULL;
  79         unsigned int clipt_size = c->clipt_size;
  80
  81         for (e = &c->cl_list[0], end = &c->cl_list[clipt_size]; e != end; ++e) {
  82                 if (rte_atomic32_read(&e->refcnt) == 0) {
  83                         if (!first_free)
  84                                 first_free = e;
  85                 } else {
  86                         if (memcmp(lip, e->addr, sizeof(e->addr)) == 0)
  87                                 goto exists;
  88                 }
  89         }
  90
  91         if (first_free) {
  92                 e = first_free;
  93                 goto exists;
  94         }
  95
  96         return NULL;
  97
  98 exists:
  99         return e;
 100 }
 101
 102 static struct clip_entry *t4_clip_alloc(struct rte_eth_dev *dev,
 103                                         u32 *lip, u8 v6)
 104 {
 105         struct adapter *adap = ethdev2adap(dev);
 106         struct clip_tbl *ctbl = adap->clipt;
 107         struct clip_entry *ce;
 108         int ret = 0;
 109
 110         if (!ctbl)
 111                 return NULL;
 112
 113         t4_os_write_lock(&ctbl->lock);
 114         ce = find_or_alloc_clipe(ctbl, lip);
 115         if (ce) {
 116                 t4_os_lock(&ce->lock);
 117                 if (!rte_atomic32_read(&ce->refcnt)) {
 118                         rte_memcpy(ce->addr, lip, sizeof(ce->addr));
 119                         if (v6) {
 120                                 ce->type = FILTER_TYPE_IPV6;
 121                                 rte_atomic32_set(&ce->refcnt, 1);
 122                                 ret = clip6_get_mbox(dev, lip);
 123                                 if (ret)
 124                                         dev_debug(adap,
 125                                                   "CLIP FW ADD CMD failed: %d",
 126                                                   ret);
 127                         } else {
 128                                 ce->type = FILTER_TYPE_IPV4;
 129                         }
 130                 } else {
 131                         rte_atomic32_inc(&ce->refcnt);
 132                 }
 133                 t4_os_unlock(&ce->lock);
 134         }
 135         t4_os_write_unlock(&ctbl->lock);
 136
 137         return ret ? NULL : ce;
 138 }
 139
 140 /**
 141  * cxgbe_clip_alloc - Allocate a IPV6 CLIP entry
 142  * @dev: rte_eth_dev pointer
 143  * @lip: IPV6 address to add
 144  * Returns pointer to the CLIP entry created
 145  *
 146  * Allocates a IPV6 CLIP entry to be used for a filter rule.
 147  */
 148 struct clip_entry *cxgbe_clip_alloc(struct rte_eth_dev *dev, u32 *lip)
 149 {
 150         return t4_clip_alloc(dev, lip, FILTER_TYPE_IPV6);
 151 }
 152
 153 /**
 154  * Initialize CLIP Table
 155  */
 156 struct clip_tbl *t4_init_clip_tbl(unsigned int clipt_start,
 157                                   unsigned int clipt_end)
 158 {
 159         unsigned int clipt_size;
 160         struct clip_tbl *ctbl;
 161         unsigned int i;
 162
 163         if (clipt_start >= clipt_end)
 164                 return NULL;
 165
 166         clipt_size = clipt_end - clipt_start + 1;
 167
 168         ctbl = t4_os_alloc(sizeof(*ctbl) +
 169                            clipt_size * sizeof(struct clip_entry));
 170         if (!ctbl)
 171                 return NULL;
 172
 173         ctbl->clipt_start = clipt_start;
 174         ctbl->clipt_size = clipt_size;
 175
 176         t4_os_rwlock_init(&ctbl->lock);
 177
 178         for (i = 0; i < ctbl->clipt_size; i++) {
 179                 t4_os_lock_init(&ctbl->cl_list[i].lock);
 180                 rte_atomic32_set(&ctbl->cl_list[i].refcnt, 0);
 181         }
 182
 183         return ctbl;
 184 }
 185
 186 /**
 187  * Cleanup CLIP Table
 188  */
 189 void t4_cleanup_clip_tbl(struct adapter *adap)
 190 {
 191         if (adap->clipt)
 192                 t4_os_free(adap->clipt);
 193 }