kernel/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                                    u8 v6)
  39 {
  40         return v6 ? ipv6_clip_hash(ctbl, addr) :
  41                         ipv4_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 ret = -1;
  82
  83         if (!ctbl)
  84                 return 0;
  85
  86         hash = clip_addr_hash(ctbl, addr, v6);
  87
  88         read_lock_bh(&ctbl->lock);
  89         list_for_each_entry(cte, &ctbl->hash_list[hash], list) {
  90                 if (cte->addr6.sin6_family == AF_INET6 && v6)
  91                         ret = memcmp(lip, cte->addr6.sin6_addr.s6_addr,
  92                                      sizeof(struct in6_addr));
  93                 else if (cte->addr.sin_family == AF_INET && !v6)
  94                         ret = memcmp(lip, (char *)(&cte->addr.sin_addr),
  95                                      sizeof(struct in_addr));
  96                 if (!ret) {
  97                         ce = cte;
  98                         read_unlock_bh(&ctbl->lock);
  99                         goto found;
 100                 }
 101         }
 102         read_unlock_bh(&ctbl->lock);
 103
 104         write_lock_bh(&ctbl->lock);
 105         if (!list_empty(&ctbl->ce_free_head)) {
 106                 ce = list_first_entry(&ctbl->ce_free_head,
 107                                       struct clip_entry, list);
 108                 list_del(&ce->list);
 109                 INIT_LIST_HEAD(&ce->list);
 110                 spin_lock_init(&ce->lock);
 111                 atomic_set(&ce->refcnt, 0);
 112                 atomic_dec(&ctbl->nfree);
 113                 list_add_tail(&ce->list, &ctbl->hash_list[hash]);
 114                 if (v6) {
 115                         ce->addr6.sin6_family = AF_INET6;
 116                         memcpy(ce->addr6.sin6_addr.s6_addr,
 117                                lip, sizeof(struct in6_addr));
 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                 } else {
 124                         ce->addr.sin_family = AF_INET;
 125                         memcpy((char *)(&ce->addr.sin_addr), lip,
 126                                sizeof(struct in_addr));
 127                 }
 128         } else {
 129                 write_unlock_bh(&ctbl->lock);
 130                 return -ENOMEM;
 131         }
 132         write_unlock_bh(&ctbl->lock);
 133 found:
 134         atomic_inc(&ce->refcnt);
 135
 136         return 0;
 137 }
 138 EXPORT_SYMBOL(cxgb4_clip_get);
 139
 140 void cxgb4_clip_release(const struct net_device *dev, const u32 *lip, u8 v6)
 141 {
 142         struct adapter *adap = netdev2adap(dev);
 143         struct clip_tbl *ctbl = adap->clipt;
 144         struct clip_entry *ce, *cte;
 145         u32 *addr = (u32 *)lip;
 146         int hash;
 147         int ret = -1;
 148
 149         hash = clip_addr_hash(ctbl, addr, v6);
 150
 151         read_lock_bh(&ctbl->lock);
 152         list_for_each_entry(cte, &ctbl->hash_list[hash], list) {
 153                 if (cte->addr6.sin6_family == AF_INET6 && v6)
 154                         ret = memcmp(lip, cte->addr6.sin6_addr.s6_addr,
 155                                      sizeof(struct in6_addr));
 156                 else if (cte->addr.sin_family == AF_INET && !v6)
 157                         ret = memcmp(lip, (char *)(&cte->addr.sin_addr),
 158                                      sizeof(struct in_addr));
 159                 if (!ret) {
 160                         ce = cte;
 161                         read_unlock_bh(&ctbl->lock);
 162                         goto found;
 163                 }
 164         }
 165         read_unlock_bh(&ctbl->lock);
 166
 167         return;
 168 found:
 169         write_lock_bh(&ctbl->lock);
 170         spin_lock_bh(&ce->lock);
 171         if (atomic_dec_and_test(&ce->refcnt)) {
 172                 list_del(&ce->list);
 173                 INIT_LIST_HEAD(&ce->list);
 174                 list_add_tail(&ce->list, &ctbl->ce_free_head);
 175                 atomic_inc(&ctbl->nfree);
 176                 if (v6)
 177                         clip6_release_mbox(dev, (const struct in6_addr *)lip);
 178         }
 179         spin_unlock_bh(&ce->lock);
 180         write_unlock_bh(&ctbl->lock);
 181 }
 182 EXPORT_SYMBOL(cxgb4_clip_release);
 183
 184 /* Retrieves IPv6 addresses from a root device (bond, vlan) associated with
 185  * a physical device.
 186  * The physical device reference is needed to send the actul CLIP command.
 187  */
 188 static int cxgb4_update_dev_clip(struct net_device *root_dev,
 189                                  struct net_device *dev)
 190 {
 191         struct inet6_dev *idev = NULL;
 192         struct inet6_ifaddr *ifa;
 193         int ret = 0;
 194
 195         idev = __in6_dev_get(root_dev);
 196         if (!idev)
 197                 return ret;
 198
 199         read_lock_bh(&idev->lock);
 200         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 201                 ret = cxgb4_clip_get(dev, (const u32 *)ifa->addr.s6_addr, 1);
 202                 if (ret < 0)
 203                         break;
 204         }
 205         read_unlock_bh(&idev->lock);
 206
 207         return ret;
 208 }
 209
 210 int cxgb4_update_root_dev_clip(struct net_device *dev)
 211 {
 212         struct net_device *root_dev = NULL;
 213         int i, ret = 0;
 214
 215         /* First populate the real net device's IPv6 addresses */
 216         ret = cxgb4_update_dev_clip(dev, dev);
 217         if (ret)
 218                 return ret;
 219
 220         /* Parse all bond and vlan devices layered on top of the physical dev */
 221         root_dev = netdev_master_upper_dev_get_rcu(dev);
 222         if (root_dev) {
 223                 ret = cxgb4_update_dev_clip(root_dev, dev);
 224                 if (ret)
 225                         return ret;
 226         }
 227
 228         for (i = 0; i < VLAN_N_VID; i++) {
 229                 root_dev = __vlan_find_dev_deep_rcu(dev, htons(ETH_P_8021Q), i);
 230                 if (!root_dev)
 231                         continue;
 232
 233                 ret = cxgb4_update_dev_clip(root_dev, dev);
 234                 if (ret)
 235                         break;
 236         }
 237
 238         return ret;
 239 }
 240 EXPORT_SYMBOL(cxgb4_update_root_dev_clip);
 241
 242 int clip_tbl_show(struct seq_file *seq, void *v)
 243 {
 244         struct adapter *adapter = seq->private;
 245         struct clip_tbl *ctbl = adapter->clipt;
 246         struct clip_entry *ce;
 247         char ip[60];
 248         int i;
 249
 250         read_lock_bh(&ctbl->lock);
 251
 252         seq_puts(seq, "IP Address                  Users\n");
 253         for (i = 0 ; i < ctbl->clipt_size;  ++i) {
 254                 list_for_each_entry(ce, &ctbl->hash_list[i], list) {
 255                         ip[0] = '\0';
 256                         sprintf(ip, "%pISc", &ce->addr);
 257                         seq_printf(seq, "%-25s   %u\n", ip,
 258                                    atomic_read(&ce->refcnt));
 259                 }
 260         }
 261         seq_printf(seq, "Free clip entries : %d\n", atomic_read(&ctbl->nfree));
 262
 263         read_unlock_bh(&ctbl->lock);
 264
 265         return 0;
 266 }
 267
 268 struct clip_tbl *t4_init_clip_tbl(unsigned int clipt_start,
 269                                   unsigned int clipt_end)
 270 {
 271         struct clip_entry *cl_list;
 272         struct clip_tbl *ctbl;
 273         unsigned int clipt_size;
 274         int i;
 275
 276         if (clipt_start >= clipt_end)
 277                 return NULL;
 278         clipt_size = clipt_end - clipt_start + 1;
 279         if (clipt_size < CLIPT_MIN_HASH_BUCKETS)
 280                 return NULL;
 281
 282         ctbl = t4_alloc_mem(sizeof(*ctbl) +
 283                             clipt_size*sizeof(struct list_head));
 284         if (!ctbl)
 285                 return NULL;
 286
 287         ctbl->clipt_start = clipt_start;
 288         ctbl->clipt_size = clipt_size;
 289         INIT_LIST_HEAD(&ctbl->ce_free_head);
 290
 291         atomic_set(&ctbl->nfree, clipt_size);
 292         rwlock_init(&ctbl->lock);
 293
 294         for (i = 0; i < ctbl->clipt_size; ++i)
 295                 INIT_LIST_HEAD(&ctbl->hash_list[i]);
 296
 297         cl_list = t4_alloc_mem(clipt_size*sizeof(struct clip_entry));
 298         ctbl->cl_list = (void *)cl_list;
 299
 300         for (i = 0; i < clipt_size; i++) {
 301                 INIT_LIST_HEAD(&cl_list[i].list);
 302                 list_add_tail(&cl_list[i].list, &ctbl->ce_free_head);
 303         }
 304
 305         return ctbl;
 306 }
 307
 308 void t4_cleanup_clip_tbl(struct adapter *adap)
 309 {
 310         struct clip_tbl *ctbl = adap->clipt;
 311
 312         if (ctbl) {
 313                 if (ctbl->cl_list)
 314                         t4_free_mem(ctbl->cl_list);
 315                 t4_free_mem(ctbl);
 316         }
 317 }
 318 EXPORT_SYMBOL(t4_cleanup_clip_tbl);