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                         refcount_inc(&ce->refcnt);
 100                         return 0;
 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_init(&ce->list);
 110                 spin_lock_init(&ce->lock);
 111                 refcount_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                                 dev_err(adap->pdev_dev,
 122                                         "CLIP FW cmd failed with error %d, "
 123                                         "Connections using %pI6c wont be "
 124                                         "offloaded",
 125                                         ret, ce->addr6.sin6_addr.s6_addr);
 126                                 return ret;
 127                         }
 128                 } else {
 129                         ce->addr.sin_family = AF_INET;
 130                         memcpy((char *)(&ce->addr.sin_addr), lip,
 131                                sizeof(struct in_addr));
 132                 }
 133         } else {
 134                 write_unlock_bh(&ctbl->lock);
 135                 dev_info(adap->pdev_dev, "CLIP table overflow, "
 136                          "Connections using %pI6c wont be offloaded",
 137                          (void *)lip);
 138                 return -ENOMEM;
 139         }
 140         write_unlock_bh(&ctbl->lock);
 141         refcount_set(&ce->refcnt, 1);
 142         return 0;
 143 }
 144 EXPORT_SYMBOL(cxgb4_clip_get);
 145
 146 void cxgb4_clip_release(const struct net_device *dev, const u32 *lip, u8 v6)
 147 {
 148         struct adapter *adap = netdev2adap(dev);
 149         struct clip_tbl *ctbl = adap->clipt;
 150         struct clip_entry *ce, *cte;
 151         u32 *addr = (u32 *)lip;
 152         int hash;
 153         int ret = -1;
 154
 155         if (!ctbl)
 156                 return;
 157
 158         hash = clip_addr_hash(ctbl, addr, v6);
 159
 160         read_lock_bh(&ctbl->lock);
 161         list_for_each_entry(cte, &ctbl->hash_list[hash], list) {
 162                 if (cte->addr6.sin6_family == AF_INET6 && v6)
 163                         ret = memcmp(lip, cte->addr6.sin6_addr.s6_addr,
 164                                      sizeof(struct in6_addr));
 165                 else if (cte->addr.sin_family == AF_INET && !v6)
 166                         ret = memcmp(lip, (char *)(&cte->addr.sin_addr),
 167                                      sizeof(struct in_addr));
 168                 if (!ret) {
 169                         ce = cte;
 170                         read_unlock_bh(&ctbl->lock);
 171                         goto found;
 172                 }
 173         }
 174         read_unlock_bh(&ctbl->lock);
 175
 176         return;
 177 found:
 178         write_lock_bh(&ctbl->lock);
 179         spin_lock_bh(&ce->lock);
 180         if (refcount_dec_and_test(&ce->refcnt)) {
 181                 list_del_init(&ce->list);
 182                 list_add_tail(&ce->list, &ctbl->ce_free_head);
 183                 atomic_inc(&ctbl->nfree);
 184                 if (v6)
 185                         clip6_release_mbox(dev, (const struct in6_addr *)lip);
 186         }
 187         spin_unlock_bh(&ce->lock);
 188         write_unlock_bh(&ctbl->lock);
 189 }
 190 EXPORT_SYMBOL(cxgb4_clip_release);
 191
 192 /* Retrieves IPv6 addresses from a root device (bond, vlan) associated with
 193  * a physical device.
 194  * The physical device reference is needed to send the actul CLIP command.
 195  */
 196 static int cxgb4_update_dev_clip(struct net_device *root_dev,
 197                                  struct net_device *dev)
 198 {
 199         struct inet6_dev *idev = NULL;
 200         struct inet6_ifaddr *ifa;
 201         int ret = 0;
 202
 203         idev = __in6_dev_get(root_dev);
 204         if (!idev)
 205                 return ret;
 206
 207         read_lock_bh(&idev->lock);
 208         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 209                 ret = cxgb4_clip_get(dev, (const u32 *)ifa->addr.s6_addr, 1);
 210                 if (ret < 0)
 211                         break;
 212         }
 213         read_unlock_bh(&idev->lock);
 214
 215         return ret;
 216 }
 217
 218 int cxgb4_update_root_dev_clip(struct net_device *dev)
 219 {
 220         struct net_device *root_dev = NULL;
 221         int i, ret = 0;
 222
 223         /* First populate the real net device's IPv6 addresses */
 224         ret = cxgb4_update_dev_clip(dev, dev);
 225         if (ret)
 226                 return ret;
 227
 228         /* Parse all bond and vlan devices layered on top of the physical dev */
 229         root_dev = netdev_master_upper_dev_get_rcu(dev);
 230         if (root_dev) {
 231                 ret = cxgb4_update_dev_clip(root_dev, dev);
 232                 if (ret)
 233                         return ret;
 234         }
 235
 236         for (i = 0; i < VLAN_N_VID; i++) {
 237                 root_dev = __vlan_find_dev_deep_rcu(dev, htons(ETH_P_8021Q), i);
 238                 if (!root_dev)
 239                         continue;
 240
 241                 ret = cxgb4_update_dev_clip(root_dev, dev);
 242                 if (ret)
 243                         break;
 244         }
 245
 246         return ret;
 247 }
 248 EXPORT_SYMBOL(cxgb4_update_root_dev_clip);
 249
 250 int clip_tbl_show(struct seq_file *seq, void *v)
 251 {
 252         struct adapter *adapter = seq->private;
 253         struct clip_tbl *ctbl = adapter->clipt;
 254         struct clip_entry *ce;
 255         char ip[60];
 256         int i;
 257
 258         read_lock_bh(&ctbl->lock);
 259
 260         seq_puts(seq, "IP Address                  Users\n");
 261         for (i = 0 ; i < ctbl->clipt_size;  ++i) {
 262                 list_for_each_entry(ce, &ctbl->hash_list[i], list) {
 263                         ip[0] = '\0';
 264                         sprintf(ip, "%pISc", &ce->addr);
 265                         seq_printf(seq, "%-25s   %u\n", ip,
 266                                    refcount_read(&ce->refcnt));
 267                 }
 268         }
 269         seq_printf(seq, "Free clip entries : %d\n", atomic_read(&ctbl->nfree));
 270
 271         read_unlock_bh(&ctbl->lock);
 272
 273         return 0;
 274 }
 275
 276 struct clip_tbl *t4_init_clip_tbl(unsigned int clipt_start,
 277                                   unsigned int clipt_end)
 278 {
 279         struct clip_entry *cl_list;
 280         struct clip_tbl *ctbl;
 281         unsigned int clipt_size;
 282         int i;
 283
 284         if (clipt_start >= clipt_end)
 285                 return NULL;
 286         clipt_size = clipt_end - clipt_start + 1;
 287         if (clipt_size < CLIPT_MIN_HASH_BUCKETS)
 288                 return NULL;
 289
 290         ctbl = kvzalloc(struct_size(ctbl, hash_list, clipt_size), GFP_KERNEL);
 291         if (!ctbl)
 292                 return NULL;
 293
 294         ctbl->clipt_start = clipt_start;
 295         ctbl->clipt_size = clipt_size;
 296         INIT_LIST_HEAD(&ctbl->ce_free_head);
 297
 298         atomic_set(&ctbl->nfree, clipt_size);
 299         rwlock_init(&ctbl->lock);
 300
 301         for (i = 0; i < ctbl->clipt_size; ++i)
 302                 INIT_LIST_HEAD(&ctbl->hash_list[i]);
 303
 304         cl_list = kvcalloc(clipt_size, sizeof(struct clip_entry), GFP_KERNEL);
 305         if (!cl_list) {
 306                 kvfree(ctbl);
 307                 return NULL;
 308         }
 309         ctbl->cl_list = (void *)cl_list;
 310
 311         for (i = 0; i < clipt_size; i++) {
 312                 INIT_LIST_HEAD(&cl_list[i].list);
 313                 list_add_tail(&cl_list[i].list, &ctbl->ce_free_head);
 314         }
 315
 316         return ctbl;
 317 }
 318
 319 void t4_cleanup_clip_tbl(struct adapter *adap)
 320 {
 321         struct clip_tbl *ctbl = adap->clipt;
 322
 323         if (ctbl) {
 324                 kvfree(ctbl->cl_list);
 325                 kvfree(ctbl);
 326         }
 327 }
 328 EXPORT_SYMBOL(t4_cleanup_clip_tbl);