drivers/net/ethernet/chelsio/cxgb4/clip_tbl.c

   1 /*
   2  *  This file is part of the Chelsio T4 Ethernet driver for Linux.
   3  *  Copyright (C) 2003-2014 Chelsio Communications.  All rights reserved.
   4  *
   5  *  Written by Deepak (deepak.s@chelsio.com)
   6  *
   7  *  This program is distributed in the hope that it will be useful, but WITHOUT
   8  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   9  *  FITNESS FOR A PARTICULAR PURPOSE.  See the LICENSE file included in this
  10  *  release for licensing terms and conditions.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/jhash.h>
  16 #include <linux/if_vlan.h>
  17 #include <net/addrconf.h>
  18 #include "cxgb4.h"
  19 #include "clip_tbl.h"
  20
  21 static inline unsigned int ipv4_clip_hash(struct clip_tbl *c, const u32 *key)
  22 {
  23         unsigned int clipt_size_half = c->clipt_size / 2;
  24
  25         return jhash_1word(*key, 0) % clipt_size_half;
  26 }
  27
  28 static inline unsigned int ipv6_clip_hash(struct clip_tbl *d, const u32 *key)
  29 {
  30         unsigned int clipt_size_half = d->clipt_size / 2;
  31         u32 xor = key[0] ^ key[1] ^ key[2] ^ key[3];
  32
  33         return clipt_size_half +
  34                 (jhash_1word(xor, 0) % clipt_size_half);
  35 }
  36
  37 static unsigned int clip_addr_hash(struct clip_tbl *ctbl, const u32 *addr,
  38                                    int addr_len)
  39 {
  40         return addr_len == 4 ? ipv4_clip_hash(ctbl, addr) :
  41                                 ipv6_clip_hash(ctbl, addr);
  42 }
  43
  44 static int clip6_get_mbox(const struct net_device *dev,
  45                           const struct in6_addr *lip)
  46 {
  47         struct adapter *adap = netdev2adap(dev);
  48         struct fw_clip_cmd c;
  49
  50         memset(&c, 0, sizeof(c));
  51         c.op_to_write = htonl(FW_CMD_OP_V(FW_CLIP_CMD) |
  52                               FW_CMD_REQUEST_F | FW_CMD_WRITE_F);
  53         c.alloc_to_len16 = htonl(FW_CLIP_CMD_ALLOC_F | FW_LEN16(c));
  54         *(__be64 *)&c.ip_hi = *(__be64 *)(lip->s6_addr);
  55         *(__be64 *)&c.ip_lo = *(__be64 *)(lip->s6_addr + 8);
  56         return t4_wr_mbox_meat(adap, adap->mbox, &c, sizeof(c), &c, false);
  57 }
  58
  59 static int clip6_release_mbox(const struct net_device *dev,
  60                               const struct in6_addr *lip)
  61 {
  62         struct adapter *adap = netdev2adap(dev);
  63         struct fw_clip_cmd c;
  64
  65         memset(&c, 0, sizeof(c));
  66         c.op_to_write = htonl(FW_CMD_OP_V(FW_CLIP_CMD) |
  67                               FW_CMD_REQUEST_F | FW_CMD_READ_F);
  68         c.alloc_to_len16 = htonl(FW_CLIP_CMD_FREE_F | FW_LEN16(c));
  69         *(__be64 *)&c.ip_hi = *(__be64 *)(lip->s6_addr);
  70         *(__be64 *)&c.ip_lo = *(__be64 *)(lip->s6_addr + 8);
  71         return t4_wr_mbox_meat(adap, adap->mbox, &c, sizeof(c), &c, false);
  72 }
  73
  74 int cxgb4_clip_get(const struct net_device *dev, const u32 *lip, u8 v6)
  75 {
  76         struct adapter *adap = netdev2adap(dev);
  77         struct clip_tbl *ctbl = adap->clipt;
  78         struct clip_entry *ce, *cte;
  79         u32 *addr = (u32 *)lip;
  80         int hash;
  81         int addr_len;
  82         int ret = 0;
  83
  84         if (!ctbl)
  85                 return 0;
  86
  87         if (v6)
  88                 addr_len = 16;
  89         else
  90                 addr_len = 4;
  91
  92         hash = clip_addr_hash(ctbl, addr, addr_len);
  93
  94         read_lock_bh(&ctbl->lock);
  95         list_for_each_entry(cte, &ctbl->hash_list[hash], list) {
  96                 if (addr_len == cte->addr_len &&
  97                     memcmp(lip, cte->addr, cte->addr_len) == 0) {
  98                         ce = cte;
  99                         read_unlock_bh(&ctbl->lock);
 100                         goto found;
 101                 }
 102         }
 103         read_unlock_bh(&ctbl->lock);
 104
 105         write_lock_bh(&ctbl->lock);
 106         if (!list_empty(&ctbl->ce_free_head)) {
 107                 ce = list_first_entry(&ctbl->ce_free_head,
 108                                       struct clip_entry, list);
 109                 list_del(&ce->list);
 110                 INIT_LIST_HEAD(&ce->list);
 111                 spin_lock_init(&ce->lock);
 112                 atomic_set(&ce->refcnt, 0);
 113                 atomic_dec(&ctbl->nfree);
 114                 ce->addr_len = addr_len;
 115                 memcpy(ce->addr, lip, addr_len);
 116                 list_add_tail(&ce->list, &ctbl->hash_list[hash]);
 117                 if (v6) {
 118                         ret = clip6_get_mbox(dev, (const struct in6_addr *)lip);
 119                         if (ret) {
 120                                 write_unlock_bh(&ctbl->lock);
 121                                 return ret;
 122                         }
 123                 }
 124         } else {
 125                 write_unlock_bh(&ctbl->lock);
 126                 return -ENOMEM;
 127         }
 128         write_unlock_bh(&ctbl->lock);
 129 found:
 130         atomic_inc(&ce->refcnt);
 131
 132         return 0;
 133 }
 134 EXPORT_SYMBOL(cxgb4_clip_get);
 135
 136 void cxgb4_clip_release(const struct net_device *dev, const u32 *lip, u8 v6)
 137 {
 138         struct adapter *adap = netdev2adap(dev);
 139         struct clip_tbl *ctbl = adap->clipt;
 140         struct clip_entry *ce, *cte;
 141         u32 *addr = (u32 *)lip;
 142         int hash;
 143         int addr_len;
 144
 145         if (v6)
 146                 addr_len = 16;
 147         else
 148                 addr_len = 4;
 149
 150         hash = clip_addr_hash(ctbl, addr, addr_len);
 151
 152         read_lock_bh(&ctbl->lock);
 153         list_for_each_entry(cte, &ctbl->hash_list[hash], list) {
 154                 if (addr_len == cte->addr_len &&
 155                     memcmp(lip, cte->addr, cte->addr_len) == 0) {
 156                         ce = cte;
 157                         read_unlock_bh(&ctbl->lock);
 158                         goto found;
 159                 }
 160         }
 161         read_unlock_bh(&ctbl->lock);
 162
 163         return;
 164 found:
 165         write_lock_bh(&ctbl->lock);
 166         spin_lock_bh(&ce->lock);
 167         if (atomic_dec_and_test(&ce->refcnt)) {
 168                 list_del(&ce->list);
 169                 INIT_LIST_HEAD(&ce->list);
 170                 list_add_tail(&ce->list, &ctbl->ce_free_head);
 171                 atomic_inc(&ctbl->nfree);
 172                 if (v6)
 173                         clip6_release_mbox(dev, (const struct in6_addr *)lip);
 174         }
 175         spin_unlock_bh(&ce->lock);
 176         write_unlock_bh(&ctbl->lock);
 177 }
 178 EXPORT_SYMBOL(cxgb4_clip_release);
 179
 180 /* Retrieves IPv6 addresses from a root device (bond, vlan) associated with
 181  * a physical device.
 182  * The physical device reference is needed to send the actul CLIP command.
 183  */
 184 static int cxgb4_update_dev_clip(struct net_device *root_dev,
 185                                  struct net_device *dev)
 186 {
 187         struct inet6_dev *idev = NULL;
 188         struct inet6_ifaddr *ifa;
 189         int ret = 0;
 190
 191         idev = __in6_dev_get(root_dev);
 192         if (!idev)
 193                 return ret;
 194
 195         read_lock_bh(&idev->lock);
 196         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 197                 ret = cxgb4_clip_get(dev, (const u32 *)ifa->addr.s6_addr, 1);
 198                 if (ret < 0)
 199                         break;
 200         }
 201         read_unlock_bh(&idev->lock);
 202
 203         return ret;
 204 }
 205
 206 int cxgb4_update_root_dev_clip(struct net_device *dev)
 207 {
 208         struct net_device *root_dev = NULL;
 209         int i, ret = 0;
 210
 211         /* First populate the real net device's IPv6 addresses */
 212         ret = cxgb4_update_dev_clip(dev, dev);
 213         if (ret)
 214                 return ret;
 215
 216         /* Parse all bond and vlan devices layered on top of the physical dev */
 217         root_dev = netdev_master_upper_dev_get_rcu(dev);
 218         if (root_dev) {
 219                 ret = cxgb4_update_dev_clip(root_dev, dev);
 220                 if (ret)
 221                         return ret;
 222         }
 223
 224         for (i = 0; i < VLAN_N_VID; i++) {
 225                 root_dev = __vlan_find_dev_deep_rcu(dev, htons(ETH_P_8021Q), i);
 226                 if (!root_dev)
 227                         continue;
 228
 229                 ret = cxgb4_update_dev_clip(root_dev, dev);
 230                 if (ret)
 231                         break;
 232         }
 233
 234         return ret;
 235 }
 236 EXPORT_SYMBOL(cxgb4_update_root_dev_clip);
 237
 238 int clip_tbl_show(struct seq_file *seq, void *v)
 239 {
 240         struct adapter *adapter = seq->private;
 241         struct clip_tbl *ctbl = adapter->clipt;
 242         struct clip_entry *ce;
 243         char ip[60];
 244         int i;
 245
 246         read_lock_bh(&ctbl->lock);
 247
 248         seq_puts(seq, "IP Address                  Users\n");
 249         for (i = 0 ; i < ctbl->clipt_size;  ++i) {
 250                 list_for_each_entry(ce, &ctbl->hash_list[i], list) {
 251                         ip[0] = '\0';
 252                         if (ce->addr_len == 16)
 253                                 sprintf(ip, "%pI6c", ce->addr);
 254                         else
 255                                 sprintf(ip, "%pI4c", ce->addr);
 256                         seq_printf(seq, "%-25s   %u\n", ip,
 257                                    atomic_read(&ce->refcnt));
 258                 }
 259         }
 260         seq_printf(seq, "Free clip entries : %d\n", atomic_read(&ctbl->nfree));
 261
 262         read_unlock_bh(&ctbl->lock);
 263
 264         return 0;
 265 }
 266
 267 struct clip_tbl *t4_init_clip_tbl(unsigned int clipt_start,
 268                                   unsigned int clipt_end)
 269 {
 270         struct clip_entry *cl_list;
 271         struct clip_tbl *ctbl;
 272         unsigned int clipt_size;
 273         int i;
 274
 275         if (clipt_start >= clipt_end)
 276                 return NULL;
 277         clipt_size = clipt_end - clipt_start + 1;
 278         if (clipt_size < CLIPT_MIN_HASH_BUCKETS)
 279                 return NULL;
 280
 281         ctbl = t4_alloc_mem(sizeof(*ctbl) +
 282                             clipt_size*sizeof(struct list_head));
 283         if (!ctbl)
 284                 return NULL;
 285
 286         ctbl->clipt_start = clipt_start;
 287         ctbl->clipt_size = clipt_size;
 288         INIT_LIST_HEAD(&ctbl->ce_free_head);
 289
 290         atomic_set(&ctbl->nfree, clipt_size);
 291         rwlock_init(&ctbl->lock);
 292
 293         for (i = 0; i < ctbl->clipt_size; ++i)
 294                 INIT_LIST_HEAD(&ctbl->hash_list[i]);
 295
 296         cl_list = t4_alloc_mem(clipt_size*sizeof(struct clip_entry));
 297         ctbl->cl_list = (void *)cl_list;
 298
 299         for (i = 0; i < clipt_size; i++) {
 300                 INIT_LIST_HEAD(&cl_list[i].list);
 301                 list_add_tail(&cl_list[i].list, &ctbl->ce_free_head);
 302         }
 303
 304         return ctbl;
 305 }
 306
 307 void t4_cleanup_clip_tbl(struct adapter *adap)
 308 {
 309         struct clip_tbl *ctbl = adap->clipt;
 310
 311         if (ctbl) {
 312                 if (ctbl->cl_list)
 313                         t4_free_mem(ctbl->cl_list);
 314                 t4_free_mem(ctbl);
 315         }
 316 }
 317 EXPORT_SYMBOL(t4_cleanup_clip_tbl);