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); 329