drivers/net/ethernet/intel/ixgbe/ixgbe

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This source file includes following definitions.
ixgbe_ipsec_set_tx_sa
ixgbe_ipsec_set_rx_item
ixgbe_ipsec_set_rx_sa
ixgbe_ipsec_set_rx_ip
ixgbe_ipsec_clear_hw_tables
ixgbe_ipsec_stop_data
ixgbe_ipsec_stop_engine
ixgbe_ipsec_start_engine
ixgbe_ipsec_restore
ixgbe_ipsec_find_empty_idx
ixgbe_ipsec_find_rx_state
ixgbe_ipsec_parse_proto_keys
ixgbe_ipsec_check_mgmt_ip
ixgbe_ipsec_add_sa
ixgbe_ipsec_del_sa
ixgbe_ipsec_offload_ok
ixgbe_ipsec_vf_clear
ixgbe_ipsec_vf_add_sa
ixgbe_ipsec_vf_del_sa
ixgbe_ipsec_tx
ixgbe_ipsec_rx
ixgbe_init_ipsec_offload
ixgbe_stop_ipsec_offload
   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2017 Oracle and/or its affiliates. All rights reserved. */
   3 
   4 #include "ixgbe.h"
   5 #include <net/xfrm.h>
   6 #include <crypto/aead.h>
   7 #include <linux/if_bridge.h>
   8 
   9 #define IXGBE_IPSEC_KEY_BITS  160
  10 static const char aes_gcm_name[] = "rfc4106(gcm(aes))";
  11 
  12 static void ixgbe_ipsec_del_sa(struct xfrm_state *xs);
  13 
  14 /**
  15  * ixgbe_ipsec_set_tx_sa - set the Tx SA registers
  16  * @hw: hw specific details
  17  * @idx: register index to write
  18  * @key: key byte array
  19  * @salt: salt bytes
  20  **/
  21 static void ixgbe_ipsec_set_tx_sa(struct ixgbe_hw *hw, u16 idx,
  22                                   u32 key[], u32 salt)
  23 {
  24         u32 reg;
  25         int i;
  26 
  27         for (i = 0; i < 4; i++)
  28                 IXGBE_WRITE_REG(hw, IXGBE_IPSTXKEY(i),
  29                                 (__force u32)cpu_to_be32(key[3 - i]));
  30         IXGBE_WRITE_REG(hw, IXGBE_IPSTXSALT, (__force u32)cpu_to_be32(salt));
  31         IXGBE_WRITE_FLUSH(hw);
  32 
  33         reg = IXGBE_READ_REG(hw, IXGBE_IPSTXIDX);
  34         reg &= IXGBE_RXTXIDX_IPS_EN;
  35         reg |= idx << IXGBE_RXTXIDX_IDX_SHIFT | IXGBE_RXTXIDX_WRITE;
  36         IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, reg);
  37         IXGBE_WRITE_FLUSH(hw);
  38 }
  39 
  40 /**
  41  * ixgbe_ipsec_set_rx_item - set an Rx table item
  42  * @hw: hw specific details
  43  * @idx: register index to write
  44  * @tbl: table selector
  45  *
  46  * Trigger the device to store into a particular Rx table the
  47  * data that has already been loaded into the input register
  48  **/
  49 static void ixgbe_ipsec_set_rx_item(struct ixgbe_hw *hw, u16 idx,
  50                                     enum ixgbe_ipsec_tbl_sel tbl)
  51 {
  52         u32 reg;
  53 
  54         reg = IXGBE_READ_REG(hw, IXGBE_IPSRXIDX);
  55         reg &= IXGBE_RXTXIDX_IPS_EN;
  56         reg |= tbl << IXGBE_RXIDX_TBL_SHIFT |
  57                idx << IXGBE_RXTXIDX_IDX_SHIFT |
  58                IXGBE_RXTXIDX_WRITE;
  59         IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, reg);
  60         IXGBE_WRITE_FLUSH(hw);
  61 }
  62 
  63 /**
  64  * ixgbe_ipsec_set_rx_sa - set up the register bits to save SA info
  65  * @hw: hw specific details
  66  * @idx: register index to write
  67  * @spi: security parameter index
  68  * @key: key byte array
  69  * @salt: salt bytes
  70  * @mode: rx decrypt control bits
  71  * @ip_idx: index into IP table for related IP address
  72  **/
  73 static void ixgbe_ipsec_set_rx_sa(struct ixgbe_hw *hw, u16 idx, __be32 spi,
  74                                   u32 key[], u32 salt, u32 mode, u32 ip_idx)
  75 {
  76         int i;
  77 
  78         /* store the SPI (in bigendian) and IPidx */
  79         IXGBE_WRITE_REG(hw, IXGBE_IPSRXSPI,
  80                         (__force u32)cpu_to_le32((__force u32)spi));
  81         IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPIDX, ip_idx);
  82         IXGBE_WRITE_FLUSH(hw);
  83 
  84         ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_spi_tbl);
  85 
  86         /* store the key, salt, and mode */
  87         for (i = 0; i < 4; i++)
  88                 IXGBE_WRITE_REG(hw, IXGBE_IPSRXKEY(i),
  89                                 (__force u32)cpu_to_be32(key[3 - i]));
  90         IXGBE_WRITE_REG(hw, IXGBE_IPSRXSALT, (__force u32)cpu_to_be32(salt));
  91         IXGBE_WRITE_REG(hw, IXGBE_IPSRXMOD, mode);
  92         IXGBE_WRITE_FLUSH(hw);
  93 
  94         ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_key_tbl);
  95 }
  96 
  97 /**
  98  * ixgbe_ipsec_set_rx_ip - set up the register bits to save SA IP addr info
  99  * @hw: hw specific details
 100  * @idx: register index to write
 101  * @addr: IP address byte array
 102  **/
 103 static void ixgbe_ipsec_set_rx_ip(struct ixgbe_hw *hw, u16 idx, __be32 addr[])
 104 {
 105         int i;
 106 
 107         /* store the ip address */
 108         for (i = 0; i < 4; i++)
 109                 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPADDR(i),
 110                                 (__force u32)cpu_to_le32((__force u32)addr[i]));
 111         IXGBE_WRITE_FLUSH(hw);
 112 
 113         ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_ip_tbl);
 114 }
 115 
 116 /**
 117  * ixgbe_ipsec_clear_hw_tables - because some tables don't get cleared on reset
 118  * @adapter: board private structure
 119  **/
 120 static void ixgbe_ipsec_clear_hw_tables(struct ixgbe_adapter *adapter)
 121 {
 122         struct ixgbe_hw *hw = &adapter->hw;
 123         u32 buf[4] = {0, 0, 0, 0};
 124         u16 idx;
 125 
 126         /* disable Rx and Tx SA lookup */
 127         IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
 128         IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
 129 
 130         /* scrub the tables - split the loops for the max of the IP table */
 131         for (idx = 0; idx < IXGBE_IPSEC_MAX_RX_IP_COUNT; idx++) {
 132                 ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
 133                 ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
 134                 ixgbe_ipsec_set_rx_ip(hw, idx, (__be32 *)buf);
 135         }
 136         for (; idx < IXGBE_IPSEC_MAX_SA_COUNT; idx++) {
 137                 ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
 138                 ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
 139         }
 140 }
 141 
 142 /**
 143  * ixgbe_ipsec_stop_data
 144  * @adapter: board private structure
 145  **/
 146 static void ixgbe_ipsec_stop_data(struct ixgbe_adapter *adapter)
 147 {
 148         struct ixgbe_hw *hw = &adapter->hw;
 149         bool link = adapter->link_up;
 150         u32 t_rdy, r_rdy;
 151         u32 limit;
 152         u32 reg;
 153 
 154         /* halt data paths */
 155         reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
 156         reg |= IXGBE_SECTXCTRL_TX_DIS;
 157         IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
 158 
 159         reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
 160         reg |= IXGBE_SECRXCTRL_RX_DIS;
 161         IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
 162 
 163         /* If both Tx and Rx are ready there are no packets
 164          * that we need to flush so the loopback configuration
 165          * below is not necessary.
 166          */
 167         t_rdy = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
 168                 IXGBE_SECTXSTAT_SECTX_RDY;
 169         r_rdy = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
 170                 IXGBE_SECRXSTAT_SECRX_RDY;
 171         if (t_rdy && r_rdy)
 172                 return;
 173 
 174         /* If the tx fifo doesn't have link, but still has data,
 175          * we can't clear the tx sec block.  Set the MAC loopback
 176          * before block clear
 177          */
 178         if (!link) {
 179                 reg = IXGBE_READ_REG(hw, IXGBE_MACC);
 180                 reg |= IXGBE_MACC_FLU;
 181                 IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
 182 
 183                 reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
 184                 reg |= IXGBE_HLREG0_LPBK;
 185                 IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
 186 
 187                 IXGBE_WRITE_FLUSH(hw);
 188                 mdelay(3);
 189         }
 190 
 191         /* wait for the paths to empty */
 192         limit = 20;
 193         do {
 194                 mdelay(10);
 195                 t_rdy = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
 196                         IXGBE_SECTXSTAT_SECTX_RDY;
 197                 r_rdy = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
 198                         IXGBE_SECRXSTAT_SECRX_RDY;
 199         } while (!(t_rdy && r_rdy) && limit--);
 200 
 201         /* undo loopback if we played with it earlier */
 202         if (!link) {
 203                 reg = IXGBE_READ_REG(hw, IXGBE_MACC);
 204                 reg &= ~IXGBE_MACC_FLU;
 205                 IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
 206 
 207                 reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
 208                 reg &= ~IXGBE_HLREG0_LPBK;
 209                 IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
 210 
 211                 IXGBE_WRITE_FLUSH(hw);
 212         }
 213 }
 214 
 215 /**
 216  * ixgbe_ipsec_stop_engine
 217  * @adapter: board private structure
 218  **/
 219 static void ixgbe_ipsec_stop_engine(struct ixgbe_adapter *adapter)
 220 {
 221         struct ixgbe_hw *hw = &adapter->hw;
 222         u32 reg;
 223 
 224         ixgbe_ipsec_stop_data(adapter);
 225 
 226         /* disable Rx and Tx SA lookup */
 227         IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
 228         IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
 229 
 230         /* disable the Rx and Tx engines and full packet store-n-forward */
 231         reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
 232         reg |= IXGBE_SECTXCTRL_SECTX_DIS;
 233         reg &= ~IXGBE_SECTXCTRL_STORE_FORWARD;
 234         IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
 235 
 236         reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
 237         reg |= IXGBE_SECRXCTRL_SECRX_DIS;
 238         IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
 239 
 240         /* restore the "tx security buffer almost full threshold" to 0x250 */
 241         IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, 0x250);
 242 
 243         /* Set minimum IFG between packets back to the default 0x1 */
 244         reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
 245         reg = (reg & 0xfffffff0) | 0x1;
 246         IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
 247 
 248         /* final set for normal (no ipsec offload) processing */
 249         IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_SECTX_DIS);
 250         IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, IXGBE_SECRXCTRL_SECRX_DIS);
 251 
 252         IXGBE_WRITE_FLUSH(hw);
 253 }
 254 
 255 /**
 256  * ixgbe_ipsec_start_engine
 257  * @adapter: board private structure
 258  *
 259  * NOTE: this increases power consumption whether being used or not
 260  **/
 261 static void ixgbe_ipsec_start_engine(struct ixgbe_adapter *adapter)
 262 {
 263         struct ixgbe_hw *hw = &adapter->hw;
 264         u32 reg;
 265 
 266         ixgbe_ipsec_stop_data(adapter);
 267 
 268         /* Set minimum IFG between packets to 3 */
 269         reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
 270         reg = (reg & 0xfffffff0) | 0x3;
 271         IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
 272 
 273         /* Set "tx security buffer almost full threshold" to 0x15 so that the
 274          * almost full indication is generated only after buffer contains at
 275          * least an entire jumbo packet.
 276          */
 277         reg = IXGBE_READ_REG(hw, IXGBE_SECTXBUFFAF);
 278         reg = (reg & 0xfffffc00) | 0x15;
 279         IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, reg);
 280 
 281         /* restart the data paths by clearing the DISABLE bits */
 282         IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, 0);
 283         IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_STORE_FORWARD);
 284 
 285         /* enable Rx and Tx SA lookup */
 286         IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, IXGBE_RXTXIDX_IPS_EN);
 287         IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, IXGBE_RXTXIDX_IPS_EN);
 288 
 289         IXGBE_WRITE_FLUSH(hw);
 290 }
 291 
 292 /**
 293  * ixgbe_ipsec_restore - restore the ipsec HW settings after a reset
 294  * @adapter: board private structure
 295  *
 296  * Reload the HW tables from the SW tables after they've been bashed
 297  * by a chip reset.
 298  *
 299  * Any VF entries are removed from the SW and HW tables since either
 300  * (a) the VF also gets reset on PF reset and will ask again for the
 301  * offloads, or (b) the VF has been removed by a change in the num_vfs.
 302  **/
 303 void ixgbe_ipsec_restore(struct ixgbe_adapter *adapter)
 304 {
 305         struct ixgbe_ipsec *ipsec = adapter->ipsec;
 306         struct ixgbe_hw *hw = &adapter->hw;
 307         int i;
 308 
 309         if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED))
 310                 return;
 311 
 312         /* clean up and restart the engine */
 313         ixgbe_ipsec_stop_engine(adapter);
 314         ixgbe_ipsec_clear_hw_tables(adapter);
 315         ixgbe_ipsec_start_engine(adapter);
 316 
 317         /* reload the Rx and Tx keys */
 318         for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
 319                 struct rx_sa *r = &ipsec->rx_tbl[i];
 320                 struct tx_sa *t = &ipsec->tx_tbl[i];
 321 
 322                 if (r->used) {
 323                         if (r->mode & IXGBE_RXTXMOD_VF)
 324                                 ixgbe_ipsec_del_sa(r->xs);
 325                         else
 326                                 ixgbe_ipsec_set_rx_sa(hw, i, r->xs->id.spi,
 327                                                       r->key, r->salt,
 328                                                       r->mode, r->iptbl_ind);
 329                 }
 330 
 331                 if (t->used) {
 332                         if (t->mode & IXGBE_RXTXMOD_VF)
 333                                 ixgbe_ipsec_del_sa(t->xs);
 334                         else
 335                                 ixgbe_ipsec_set_tx_sa(hw, i, t->key, t->salt);
 336                 }
 337         }
 338 
 339         /* reload the IP addrs */
 340         for (i = 0; i < IXGBE_IPSEC_MAX_RX_IP_COUNT; i++) {
 341                 struct rx_ip_sa *ipsa = &ipsec->ip_tbl[i];
 342 
 343                 if (ipsa->used)
 344                         ixgbe_ipsec_set_rx_ip(hw, i, ipsa->ipaddr);
 345         }
 346 }
 347 
 348 /**
 349  * ixgbe_ipsec_find_empty_idx - find the first unused security parameter index
 350  * @ipsec: pointer to ipsec struct
 351  * @rxtable: true if we need to look in the Rx table
 352  *
 353  * Returns the first unused index in either the Rx or Tx SA table
 354  **/
 355 static int ixgbe_ipsec_find_empty_idx(struct ixgbe_ipsec *ipsec, bool rxtable)
 356 {
 357         u32 i;
 358 
 359         if (rxtable) {
 360                 if (ipsec->num_rx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
 361                         return -ENOSPC;
 362 
 363                 /* search rx sa table */
 364                 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
 365                         if (!ipsec->rx_tbl[i].used)
 366                                 return i;
 367                 }
 368         } else {
 369                 if (ipsec->num_tx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
 370                         return -ENOSPC;
 371 
 372                 /* search tx sa table */
 373                 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
 374                         if (!ipsec->tx_tbl[i].used)
 375                                 return i;
 376                 }
 377         }
 378 
 379         return -ENOSPC;
 380 }
 381 
 382 /**
 383  * ixgbe_ipsec_find_rx_state - find the state that matches
 384  * @ipsec: pointer to ipsec struct
 385  * @daddr: inbound address to match
 386  * @proto: protocol to match
 387  * @spi: SPI to match
 388  * @ip4: true if using an ipv4 address
 389  *
 390  * Returns a pointer to the matching SA state information
 391  **/
 392 static struct xfrm_state *ixgbe_ipsec_find_rx_state(struct ixgbe_ipsec *ipsec,
 393                                                     __be32 *daddr, u8 proto,
 394                                                     __be32 spi, bool ip4)
 395 {
 396         struct rx_sa *rsa;
 397         struct xfrm_state *ret = NULL;
 398 
 399         rcu_read_lock();
 400         hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist,
 401                                    (__force u32)spi) {
 402                 if (rsa->mode & IXGBE_RXTXMOD_VF)
 403                         continue;
 404                 if (spi == rsa->xs->id.spi &&
 405                     ((ip4 && *daddr == rsa->xs->id.daddr.a4) ||
 406                       (!ip4 && !memcmp(daddr, &rsa->xs->id.daddr.a6,
 407                                        sizeof(rsa->xs->id.daddr.a6)))) &&
 408                     proto == rsa->xs->id.proto) {
 409                         ret = rsa->xs;
 410                         xfrm_state_hold(ret);
 411                         break;
 412                 }
 413         }
 414         rcu_read_unlock();
 415         return ret;
 416 }
 417 
 418 /**
 419  * ixgbe_ipsec_parse_proto_keys - find the key and salt based on the protocol
 420  * @xs: pointer to xfrm_state struct
 421  * @mykey: pointer to key array to populate
 422  * @mysalt: pointer to salt value to populate
 423  *
 424  * This copies the protocol keys and salt to our own data tables.  The
 425  * 82599 family only supports the one algorithm.
 426  **/
 427 static int ixgbe_ipsec_parse_proto_keys(struct xfrm_state *xs,
 428                                         u32 *mykey, u32 *mysalt)
 429 {
 430         struct net_device *dev = xs->xso.dev;
 431         unsigned char *key_data;
 432         char *alg_name = NULL;
 433         int key_len;
 434 
 435         if (!xs->aead) {
 436                 netdev_err(dev, "Unsupported IPsec algorithm\n");
 437                 return -EINVAL;
 438         }
 439 
 440         if (xs->aead->alg_icv_len != IXGBE_IPSEC_AUTH_BITS) {
 441                 netdev_err(dev, "IPsec offload requires %d bit authentication\n",
 442                            IXGBE_IPSEC_AUTH_BITS);
 443                 return -EINVAL;
 444         }
 445 
 446         key_data = &xs->aead->alg_key[0];
 447         key_len = xs->aead->alg_key_len;
 448         alg_name = xs->aead->alg_name;
 449 
 450         if (strcmp(alg_name, aes_gcm_name)) {
 451                 netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n",
 452                            aes_gcm_name);
 453                 return -EINVAL;
 454         }
 455 
 456         /* The key bytes come down in a bigendian array of bytes, so
 457          * we don't need to do any byteswapping.
 458          * 160 accounts for 16 byte key and 4 byte salt
 459          */
 460         if (key_len == IXGBE_IPSEC_KEY_BITS) {
 461                 *mysalt = ((u32 *)key_data)[4];
 462         } else if (key_len != (IXGBE_IPSEC_KEY_BITS - (sizeof(*mysalt) * 8))) {
 463                 netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
 464                 return -EINVAL;
 465         } else {
 466                 netdev_info(dev, "IPsec hw offload parameters missing 32 bit salt value\n");
 467                 *mysalt = 0;
 468         }
 469         memcpy(mykey, key_data, 16);
 470 
 471         return 0;
 472 }
 473 
 474 /**
 475  * ixgbe_ipsec_check_mgmt_ip - make sure there is no clash with mgmt IP filters
 476  * @xs: pointer to transformer state struct
 477  **/
 478 static int ixgbe_ipsec_check_mgmt_ip(struct xfrm_state *xs)
 479 {
 480         struct net_device *dev = xs->xso.dev;
 481         struct ixgbe_adapter *adapter = netdev_priv(dev);
 482         struct ixgbe_hw *hw = &adapter->hw;
 483         u32 mfval, manc, reg;
 484         int num_filters = 4;
 485         bool manc_ipv4;
 486         u32 bmcipval;
 487         int i, j;
 488 
 489 #define MANC_EN_IPV4_FILTER      BIT(24)
 490 #define MFVAL_IPV4_FILTER_SHIFT  16
 491 #define MFVAL_IPV6_FILTER_SHIFT  24
 492 #define MIPAF_ARR(_m, _n)        (IXGBE_MIPAF + ((_m) * 0x10) + ((_n) * 4))
 493 
 494 #define IXGBE_BMCIP(_n)          (0x5050 + ((_n) * 4))
 495 #define IXGBE_BMCIPVAL           0x5060
 496 #define BMCIP_V4                 0x2
 497 #define BMCIP_V6                 0x3
 498 #define BMCIP_MASK               0x3
 499 
 500         manc = IXGBE_READ_REG(hw, IXGBE_MANC);
 501         manc_ipv4 = !!(manc & MANC_EN_IPV4_FILTER);
 502         mfval = IXGBE_READ_REG(hw, IXGBE_MFVAL);
 503         bmcipval = IXGBE_READ_REG(hw, IXGBE_BMCIPVAL);
 504 
 505         if (xs->props.family == AF_INET) {
 506                 /* are there any IPv4 filters to check? */
 507                 if (manc_ipv4) {
 508                         /* the 4 ipv4 filters are all in MIPAF(3, i) */
 509                         for (i = 0; i < num_filters; i++) {
 510                                 if (!(mfval & BIT(MFVAL_IPV4_FILTER_SHIFT + i)))
 511                                         continue;
 512 
 513                                 reg = IXGBE_READ_REG(hw, MIPAF_ARR(3, i));
 514                                 if (reg == xs->id.daddr.a4)
 515                                         return 1;
 516                         }
 517                 }
 518 
 519                 if ((bmcipval & BMCIP_MASK) == BMCIP_V4) {
 520                         reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(3));
 521                         if (reg == xs->id.daddr.a4)
 522                                 return 1;
 523                 }
 524 
 525         } else {
 526                 /* if there are ipv4 filters, they are in the last ipv6 slot */
 527                 if (manc_ipv4)
 528                         num_filters = 3;
 529 
 530                 for (i = 0; i < num_filters; i++) {
 531                         if (!(mfval & BIT(MFVAL_IPV6_FILTER_SHIFT + i)))
 532                                 continue;
 533 
 534                         for (j = 0; j < 4; j++) {
 535                                 reg = IXGBE_READ_REG(hw, MIPAF_ARR(i, j));
 536                                 if (reg != xs->id.daddr.a6[j])
 537                                         break;
 538                         }
 539                         if (j == 4)   /* did we match all 4 words? */
 540                                 return 1;
 541                 }
 542 
 543                 if ((bmcipval & BMCIP_MASK) == BMCIP_V6) {
 544                         for (j = 0; j < 4; j++) {
 545                                 reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(j));
 546                                 if (reg != xs->id.daddr.a6[j])
 547                                         break;
 548                         }
 549                         if (j == 4)   /* did we match all 4 words? */
 550                                 return 1;
 551                 }
 552         }
 553 
 554         return 0;
 555 }
 556 
 557 /**
 558  * ixgbe_ipsec_add_sa - program device with a security association
 559  * @xs: pointer to transformer state struct
 560  **/
 561 static int ixgbe_ipsec_add_sa(struct xfrm_state *xs)
 562 {
 563         struct net_device *dev = xs->xso.dev;
 564         struct ixgbe_adapter *adapter = netdev_priv(dev);
 565         struct ixgbe_ipsec *ipsec = adapter->ipsec;
 566         struct ixgbe_hw *hw = &adapter->hw;
 567         int checked, match, first;
 568         u16 sa_idx;
 569         int ret;
 570         int i;
 571 
 572         if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
 573                 netdev_err(dev, "Unsupported protocol 0x%04x for ipsec offload\n",
 574                            xs->id.proto);
 575                 return -EINVAL;
 576         }
 577 
 578         if (ixgbe_ipsec_check_mgmt_ip(xs)) {
 579                 netdev_err(dev, "IPsec IP addr clash with mgmt filters\n");
 580                 return -EINVAL;
 581         }
 582 
 583         if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
 584                 struct rx_sa rsa;
 585 
 586                 if (xs->calg) {
 587                         netdev_err(dev, "Compression offload not supported\n");
 588                         return -EINVAL;
 589                 }
 590 
 591                 /* find the first unused index */
 592                 ret = ixgbe_ipsec_find_empty_idx(ipsec, true);
 593                 if (ret < 0) {
 594                         netdev_err(dev, "No space for SA in Rx table!\n");
 595                         return ret;
 596                 }
 597                 sa_idx = (u16)ret;
 598 
 599                 memset(&rsa, 0, sizeof(rsa));
 600                 rsa.used = true;
 601                 rsa.xs = xs;
 602 
 603                 if (rsa.xs->id.proto & IPPROTO_ESP)
 604                         rsa.decrypt = xs->ealg || xs->aead;
 605 
 606                 /* get the key and salt */
 607                 ret = ixgbe_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
 608                 if (ret) {
 609                         netdev_err(dev, "Failed to get key data for Rx SA table\n");
 610                         return ret;
 611                 }
 612 
 613                 /* get ip for rx sa table */
 614                 if (xs->props.family == AF_INET6)
 615                         memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
 616                 else
 617                         memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
 618 
 619                 /* The HW does not have a 1:1 mapping from keys to IP addrs, so
 620                  * check for a matching IP addr entry in the table.  If the addr
 621                  * already exists, use it; else find an unused slot and add the
 622                  * addr.  If one does not exist and there are no unused table
 623                  * entries, fail the request.
 624                  */
 625 
 626                 /* Find an existing match or first not used, and stop looking
 627                  * after we've checked all we know we have.
 628                  */
 629                 checked = 0;
 630                 match = -1;
 631                 first = -1;
 632                 for (i = 0;
 633                      i < IXGBE_IPSEC_MAX_RX_IP_COUNT &&
 634                      (checked < ipsec->num_rx_sa || first < 0);
 635                      i++) {
 636                         if (ipsec->ip_tbl[i].used) {
 637                                 if (!memcmp(ipsec->ip_tbl[i].ipaddr,
 638                                             rsa.ipaddr, sizeof(rsa.ipaddr))) {
 639                                         match = i;
 640                                         break;
 641                                 }
 642                                 checked++;
 643                         } else if (first < 0) {
 644                                 first = i;  /* track the first empty seen */
 645                         }
 646                 }
 647 
 648                 if (ipsec->num_rx_sa == 0)
 649                         first = 0;
 650 
 651                 if (match >= 0) {
 652                         /* addrs are the same, we should use this one */
 653                         rsa.iptbl_ind = match;
 654                         ipsec->ip_tbl[match].ref_cnt++;
 655 
 656                 } else if (first >= 0) {
 657                         /* no matches, but here's an empty slot */
 658                         rsa.iptbl_ind = first;
 659 
 660                         memcpy(ipsec->ip_tbl[first].ipaddr,
 661                                rsa.ipaddr, sizeof(rsa.ipaddr));
 662                         ipsec->ip_tbl[first].ref_cnt = 1;
 663                         ipsec->ip_tbl[first].used = true;
 664 
 665                         ixgbe_ipsec_set_rx_ip(hw, rsa.iptbl_ind, rsa.ipaddr);
 666 
 667                 } else {
 668                         /* no match and no empty slot */
 669                         netdev_err(dev, "No space for SA in Rx IP SA table\n");
 670                         memset(&rsa, 0, sizeof(rsa));
 671                         return -ENOSPC;
 672                 }
 673 
 674                 rsa.mode = IXGBE_RXMOD_VALID;
 675                 if (rsa.xs->id.proto & IPPROTO_ESP)
 676                         rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
 677                 if (rsa.decrypt)
 678                         rsa.mode |= IXGBE_RXMOD_DECRYPT;
 679                 if (rsa.xs->props.family == AF_INET6)
 680                         rsa.mode |= IXGBE_RXMOD_IPV6;
 681 
 682                 /* the preparations worked, so save the info */
 683                 memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
 684 
 685                 ixgbe_ipsec_set_rx_sa(hw, sa_idx, rsa.xs->id.spi, rsa.key,
 686                                       rsa.salt, rsa.mode, rsa.iptbl_ind);
 687                 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
 688 
 689                 ipsec->num_rx_sa++;
 690 
 691                 /* hash the new entry for faster search in Rx path */
 692                 hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
 693                              (__force u32)rsa.xs->id.spi);
 694         } else {
 695                 struct tx_sa tsa;
 696 
 697                 if (adapter->num_vfs &&
 698                     adapter->bridge_mode != BRIDGE_MODE_VEPA)
 699                         return -EOPNOTSUPP;
 700 
 701                 /* find the first unused index */
 702                 ret = ixgbe_ipsec_find_empty_idx(ipsec, false);
 703                 if (ret < 0) {
 704                         netdev_err(dev, "No space for SA in Tx table\n");
 705                         return ret;
 706                 }
 707                 sa_idx = (u16)ret;
 708 
 709                 memset(&tsa, 0, sizeof(tsa));
 710                 tsa.used = true;
 711                 tsa.xs = xs;
 712 
 713                 if (xs->id.proto & IPPROTO_ESP)
 714                         tsa.encrypt = xs->ealg || xs->aead;
 715 
 716                 ret = ixgbe_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
 717                 if (ret) {
 718                         netdev_err(dev, "Failed to get key data for Tx SA table\n");
 719                         memset(&tsa, 0, sizeof(tsa));
 720                         return ret;
 721                 }
 722 
 723                 /* the preparations worked, so save the info */
 724                 memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
 725 
 726                 ixgbe_ipsec_set_tx_sa(hw, sa_idx, tsa.key, tsa.salt);
 727 
 728                 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
 729 
 730                 ipsec->num_tx_sa++;
 731         }
 732 
 733         /* enable the engine if not already warmed up */
 734         if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED)) {
 735                 ixgbe_ipsec_start_engine(adapter);
 736                 adapter->flags2 |= IXGBE_FLAG2_IPSEC_ENABLED;
 737         }
 738 
 739         return 0;
 740 }
 741 
 742 /**
 743  * ixgbe_ipsec_del_sa - clear out this specific SA
 744  * @xs: pointer to transformer state struct
 745  **/
 746 static void ixgbe_ipsec_del_sa(struct xfrm_state *xs)
 747 {
 748         struct net_device *dev = xs->xso.dev;
 749         struct ixgbe_adapter *adapter = netdev_priv(dev);
 750         struct ixgbe_ipsec *ipsec = adapter->ipsec;
 751         struct ixgbe_hw *hw = &adapter->hw;
 752         u32 zerobuf[4] = {0, 0, 0, 0};
 753         u16 sa_idx;
 754 
 755         if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
 756                 struct rx_sa *rsa;
 757                 u8 ipi;
 758 
 759                 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
 760                 rsa = &ipsec->rx_tbl[sa_idx];
 761 
 762                 if (!rsa->used) {
 763                         netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
 764                                    sa_idx, xs->xso.offload_handle);
 765                         return;
 766                 }
 767 
 768                 ixgbe_ipsec_set_rx_sa(hw, sa_idx, 0, zerobuf, 0, 0, 0);
 769                 hash_del_rcu(&rsa->hlist);
 770 
 771                 /* if the IP table entry is referenced by only this SA,
 772                  * i.e. ref_cnt is only 1, clear the IP table entry as well
 773                  */
 774                 ipi = rsa->iptbl_ind;
 775                 if (ipsec->ip_tbl[ipi].ref_cnt > 0) {
 776                         ipsec->ip_tbl[ipi].ref_cnt--;
 777 
 778                         if (!ipsec->ip_tbl[ipi].ref_cnt) {
 779                                 memset(&ipsec->ip_tbl[ipi], 0,
 780                                        sizeof(struct rx_ip_sa));
 781                                 ixgbe_ipsec_set_rx_ip(hw, ipi,
 782                                                       (__force __be32 *)zerobuf);
 783                         }
 784                 }
 785 
 786                 memset(rsa, 0, sizeof(struct rx_sa));
 787                 ipsec->num_rx_sa--;
 788         } else {
 789                 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
 790 
 791                 if (!ipsec->tx_tbl[sa_idx].used) {
 792                         netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
 793                                    sa_idx, xs->xso.offload_handle);
 794                         return;
 795                 }
 796 
 797                 ixgbe_ipsec_set_tx_sa(hw, sa_idx, zerobuf, 0);
 798                 memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
 799                 ipsec->num_tx_sa--;
 800         }
 801 
 802         /* if there are no SAs left, stop the engine to save energy */
 803         if (ipsec->num_rx_sa == 0 && ipsec->num_tx_sa == 0) {
 804                 adapter->flags2 &= ~IXGBE_FLAG2_IPSEC_ENABLED;
 805                 ixgbe_ipsec_stop_engine(adapter);
 806         }
 807 }
 808 
 809 /**
 810  * ixgbe_ipsec_offload_ok - can this packet use the xfrm hw offload
 811  * @skb: current data packet
 812  * @xs: pointer to transformer state struct
 813  **/
 814 static bool ixgbe_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
 815 {
 816         if (xs->props.family == AF_INET) {
 817                 /* Offload with IPv4 options is not supported yet */
 818                 if (ip_hdr(skb)->ihl != 5)
 819                         return false;
 820         } else {
 821                 /* Offload with IPv6 extension headers is not support yet */
 822                 if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
 823                         return false;
 824         }
 825 
 826         return true;
 827 }
 828 
 829 static const struct xfrmdev_ops ixgbe_xfrmdev_ops = {
 830         .xdo_dev_state_add = ixgbe_ipsec_add_sa,
 831         .xdo_dev_state_delete = ixgbe_ipsec_del_sa,
 832         .xdo_dev_offload_ok = ixgbe_ipsec_offload_ok,
 833 };
 834 
 835 /**
 836  * ixgbe_ipsec_vf_clear - clear the tables of data for a VF
 837  * @adapter: board private structure
 838  * @vf: VF id to be removed
 839  **/
 840 void ixgbe_ipsec_vf_clear(struct ixgbe_adapter *adapter, u32 vf)
 841 {
 842         struct ixgbe_ipsec *ipsec = adapter->ipsec;
 843         int i;
 844 
 845         if (!ipsec)
 846                 return;
 847 
 848         /* search rx sa table */
 849         for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_rx_sa; i++) {
 850                 if (!ipsec->rx_tbl[i].used)
 851                         continue;
 852                 if (ipsec->rx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
 853                     ipsec->rx_tbl[i].vf == vf)
 854                         ixgbe_ipsec_del_sa(ipsec->rx_tbl[i].xs);
 855         }
 856 
 857         /* search tx sa table */
 858         for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_tx_sa; i++) {
 859                 if (!ipsec->tx_tbl[i].used)
 860                         continue;
 861                 if (ipsec->tx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
 862                     ipsec->tx_tbl[i].vf == vf)
 863                         ixgbe_ipsec_del_sa(ipsec->tx_tbl[i].xs);
 864         }
 865 }
 866 
 867 /**
 868  * ixgbe_ipsec_vf_add_sa - translate VF request to SA add
 869  * @adapter: board private structure
 870  * @msgbuf: The message buffer
 871  * @vf: the VF index
 872  *
 873  * Make up a new xs and algorithm info from the data sent by the VF.
 874  * We only need to sketch in just enough to set up the HW offload.
 875  * Put the resulting offload_handle into the return message to the VF.
 876  *
 877  * Returns 0 or error value
 878  **/
 879 int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
 880 {
 881         struct ixgbe_ipsec *ipsec = adapter->ipsec;
 882         struct xfrm_algo_desc *algo;
 883         struct sa_mbx_msg *sam;
 884         struct xfrm_state *xs;
 885         size_t aead_len;
 886         u16 sa_idx;
 887         u32 pfsa;
 888         int err;
 889 
 890         sam = (struct sa_mbx_msg *)(&msgbuf[1]);
 891         if (!adapter->vfinfo[vf].trusted ||
 892             !(adapter->flags2 & IXGBE_FLAG2_VF_IPSEC_ENABLED)) {
 893                 e_warn(drv, "VF %d attempted to add an IPsec SA\n", vf);
 894                 err = -EACCES;
 895                 goto err_out;
 896         }
 897 
 898         /* Tx IPsec offload doesn't seem to work on this
 899          * device, so block these requests for now.
 900          */
 901         if (!(sam->flags & XFRM_OFFLOAD_INBOUND)) {
 902                 err = -EOPNOTSUPP;
 903                 goto err_out;
 904         }
 905 
 906         xs = kzalloc(sizeof(*xs), GFP_KERNEL);
 907         if (unlikely(!xs)) {
 908                 err = -ENOMEM;
 909                 goto err_out;
 910         }
 911 
 912         xs->xso.flags = sam->flags;
 913         xs->id.spi = sam->spi;
 914         xs->id.proto = sam->proto;
 915         xs->props.family = sam->family;
 916         if (xs->props.family == AF_INET6)
 917                 memcpy(&xs->id.daddr.a6, sam->addr, sizeof(xs->id.daddr.a6));
 918         else
 919                 memcpy(&xs->id.daddr.a4, sam->addr, sizeof(xs->id.daddr.a4));
 920         xs->xso.dev = adapter->netdev;
 921 
 922         algo = xfrm_aead_get_byname(aes_gcm_name, IXGBE_IPSEC_AUTH_BITS, 1);
 923         if (unlikely(!algo)) {
 924                 err = -ENOENT;
 925                 goto err_xs;
 926         }
 927 
 928         aead_len = sizeof(*xs->aead) + IXGBE_IPSEC_KEY_BITS / 8;
 929         xs->aead = kzalloc(aead_len, GFP_KERNEL);
 930         if (unlikely(!xs->aead)) {
 931                 err = -ENOMEM;
 932                 goto err_xs;
 933         }
 934 
 935         xs->props.ealgo = algo->desc.sadb_alg_id;
 936         xs->geniv = algo->uinfo.aead.geniv;
 937         xs->aead->alg_icv_len = IXGBE_IPSEC_AUTH_BITS;
 938         xs->aead->alg_key_len = IXGBE_IPSEC_KEY_BITS;
 939         memcpy(xs->aead->alg_key, sam->key, sizeof(sam->key));
 940         memcpy(xs->aead->alg_name, aes_gcm_name, sizeof(aes_gcm_name));
 941 
 942         /* set up the HW offload */
 943         err = ixgbe_ipsec_add_sa(xs);
 944         if (err)
 945                 goto err_aead;
 946 
 947         pfsa = xs->xso.offload_handle;
 948         if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
 949                 sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
 950                 ipsec->rx_tbl[sa_idx].vf = vf;
 951                 ipsec->rx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
 952         } else {
 953                 sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
 954                 ipsec->tx_tbl[sa_idx].vf = vf;
 955                 ipsec->tx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
 956         }
 957 
 958         msgbuf[1] = xs->xso.offload_handle;
 959 
 960         return 0;
 961 
 962 err_aead:
 963         kzfree(xs->aead);
 964 err_xs:
 965         kzfree(xs);
 966 err_out:
 967         msgbuf[1] = err;
 968         return err;
 969 }
 970 
 971 /**
 972  * ixgbe_ipsec_vf_del_sa - translate VF request to SA delete
 973  * @adapter: board private structure
 974  * @msgbuf: The message buffer
 975  * @vf: the VF index
 976  *
 977  * Given the offload_handle sent by the VF, look for the related SA table
 978  * entry and use its xs field to call for a delete of the SA.
 979  *
 980  * Note: We silently ignore requests to delete entries that are already
 981  *       set to unused because when a VF is set to "DOWN", the PF first
 982  *       gets a reset and clears all the VF's entries; then the VF's
 983  *       XFRM stack sends individual deletes for each entry, which the
 984  *       reset already removed.  In the future it might be good to try to
 985  *       optimize this so not so many unnecessary delete messages are sent.
 986  *
 987  * Returns 0 or error value
 988  **/
 989 int ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
 990 {
 991         struct ixgbe_ipsec *ipsec = adapter->ipsec;
 992         struct xfrm_state *xs;
 993         u32 pfsa = msgbuf[1];
 994         u16 sa_idx;
 995 
 996         if (!adapter->vfinfo[vf].trusted) {
 997                 e_err(drv, "vf %d attempted to delete an SA\n", vf);
 998                 return -EPERM;
 999         }
1000 
1001         if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
1002                 struct rx_sa *rsa;
1003 
1004                 sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
1005                 if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1006                         e_err(drv, "vf %d SA index %d out of range\n",
1007                               vf, sa_idx);
1008                         return -EINVAL;
1009                 }
1010 
1011                 rsa = &ipsec->rx_tbl[sa_idx];
1012 
1013                 if (!rsa->used)
1014                         return 0;
1015 
1016                 if (!(rsa->mode & IXGBE_RXTXMOD_VF) ||
1017                     rsa->vf != vf) {
1018                         e_err(drv, "vf %d bad Rx SA index %d\n", vf, sa_idx);
1019                         return -ENOENT;
1020                 }
1021 
1022                 xs = ipsec->rx_tbl[sa_idx].xs;
1023         } else {
1024                 struct tx_sa *tsa;
1025 
1026                 sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
1027                 if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1028                         e_err(drv, "vf %d SA index %d out of range\n",
1029                               vf, sa_idx);
1030                         return -EINVAL;
1031                 }
1032 
1033                 tsa = &ipsec->tx_tbl[sa_idx];
1034 
1035                 if (!tsa->used)
1036                         return 0;
1037 
1038                 if (!(tsa->mode & IXGBE_RXTXMOD_VF) ||
1039                     tsa->vf != vf) {
1040                         e_err(drv, "vf %d bad Tx SA index %d\n", vf, sa_idx);
1041                         return -ENOENT;
1042                 }
1043 
1044                 xs = ipsec->tx_tbl[sa_idx].xs;
1045         }
1046 
1047         ixgbe_ipsec_del_sa(xs);
1048 
1049         /* remove the xs that was made-up in the add request */
1050         kzfree(xs);
1051 
1052         return 0;
1053 }
1054 
1055 /**
1056  * ixgbe_ipsec_tx - setup Tx flags for ipsec offload
1057  * @tx_ring: outgoing context
1058  * @first: current data packet
1059  * @itd: ipsec Tx data for later use in building context descriptor
1060  **/
1061 int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
1062                    struct ixgbe_tx_buffer *first,
1063                    struct ixgbe_ipsec_tx_data *itd)
1064 {
1065         struct ixgbe_adapter *adapter = netdev_priv(tx_ring->netdev);
1066         struct ixgbe_ipsec *ipsec = adapter->ipsec;
1067         struct xfrm_state *xs;
1068         struct sec_path *sp;
1069         struct tx_sa *tsa;
1070 
1071         sp = skb_sec_path(first->skb);
1072         if (unlikely(!sp->len)) {
1073                 netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
1074                            __func__, sp->len);
1075                 return 0;
1076         }
1077 
1078         xs = xfrm_input_state(first->skb);
1079         if (unlikely(!xs)) {
1080                 netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
1081                            __func__, xs);
1082                 return 0;
1083         }
1084 
1085         itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
1086         if (unlikely(itd->sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
1087                 netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
1088                            __func__, itd->sa_idx, xs->xso.offload_handle);
1089                 return 0;
1090         }
1091 
1092         tsa = &ipsec->tx_tbl[itd->sa_idx];
1093         if (unlikely(!tsa->used)) {
1094                 netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
1095                            __func__, itd->sa_idx);
1096                 return 0;
1097         }
1098 
1099         first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CC;
1100 
1101         if (xs->id.proto == IPPROTO_ESP) {
1102 
1103                 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
1104                               IXGBE_ADVTXD_TUCMD_L4T_TCP;
1105                 if (first->protocol == htons(ETH_P_IP))
1106                         itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
1107 
1108                 /* The actual trailer length is authlen (16 bytes) plus
1109                  * 2 bytes for the proto and the padlen values, plus
1110                  * padlen bytes of padding.  This ends up not the same
1111                  * as the static value found in xs->props.trailer_len (21).
1112                  *
1113                  * ... but if we're doing GSO, don't bother as the stack
1114                  * doesn't add a trailer for those.
1115                  */
1116                 if (!skb_is_gso(first->skb)) {
1117                         /* The "correct" way to get the auth length would be
1118                          * to use
1119                          *    authlen = crypto_aead_authsize(xs->data);
1120                          * but since we know we only have one size to worry
1121                          * about * we can let the compiler use the constant
1122                          * and save us a few CPU cycles.
1123                          */
1124                         const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
1125                         struct sk_buff *skb = first->skb;
1126                         u8 padlen;
1127                         int ret;
1128 
1129                         ret = skb_copy_bits(skb, skb->len - (authlen + 2),
1130                                             &padlen, 1);
1131                         if (unlikely(ret))
1132                                 return 0;
1133                         itd->trailer_len = authlen + 2 + padlen;
1134                 }
1135         }
1136         if (tsa->encrypt)
1137                 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
1138 
1139         return 1;
1140 }
1141 
1142 /**
1143  * ixgbe_ipsec_rx - decode ipsec bits from Rx descriptor
1144  * @rx_ring: receiving ring
1145  * @rx_desc: receive data descriptor
1146  * @skb: current data packet
1147  *
1148  * Determine if there was an ipsec encapsulation noticed, and if so set up
1149  * the resulting status for later in the receive stack.
1150  **/
1151 void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
1152                     union ixgbe_adv_rx_desc *rx_desc,
1153                     struct sk_buff *skb)
1154 {
1155         struct ixgbe_adapter *adapter = netdev_priv(rx_ring->netdev);
1156         __le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
1157         __le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
1158                                              IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
1159         struct ixgbe_ipsec *ipsec = adapter->ipsec;
1160         struct xfrm_offload *xo = NULL;
1161         struct xfrm_state *xs = NULL;
1162         struct ipv6hdr *ip6 = NULL;
1163         struct iphdr *ip4 = NULL;
1164         struct sec_path *sp;
1165         void *daddr;
1166         __be32 spi;
1167         u8 *c_hdr;
1168         u8 proto;
1169 
1170         /* Find the ip and crypto headers in the data.
1171          * We can assume no vlan header in the way, b/c the
1172          * hw won't recognize the IPsec packet and anyway the
1173          * currently vlan device doesn't support xfrm offload.
1174          */
1175         if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
1176                 ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
1177                 daddr = &ip4->daddr;
1178                 c_hdr = (u8 *)ip4 + ip4->ihl * 4;
1179         } else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
1180                 ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
1181                 daddr = &ip6->daddr;
1182                 c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
1183         } else {
1184                 return;
1185         }
1186 
1187         switch (pkt_info & ipsec_pkt_types) {
1188         case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
1189                 spi = ((struct ip_auth_hdr *)c_hdr)->spi;
1190                 proto = IPPROTO_AH;
1191                 break;
1192         case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
1193                 spi = ((struct ip_esp_hdr *)c_hdr)->spi;
1194                 proto = IPPROTO_ESP;
1195                 break;
1196         default:
1197                 return;
1198         }
1199 
1200         xs = ixgbe_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
1201         if (unlikely(!xs))
1202                 return;
1203 
1204         sp = secpath_set(skb);
1205         if (unlikely(!sp))
1206                 return;
1207 
1208         sp->xvec[sp->len++] = xs;
1209         sp->olen++;
1210         xo = xfrm_offload(skb);
1211         xo->flags = CRYPTO_DONE;
1212         xo->status = CRYPTO_SUCCESS;
1213 
1214         adapter->rx_ipsec++;
1215 }
1216 
1217 /**
1218  * ixgbe_init_ipsec_offload - initialize security registers for IPSec operation
1219  * @adapter: board private structure
1220  **/
1221 void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter)
1222 {
1223         struct ixgbe_hw *hw = &adapter->hw;
1224         struct ixgbe_ipsec *ipsec;
1225         u32 t_dis, r_dis;
1226         size_t size;
1227 
1228         if (hw->mac.type == ixgbe_mac_82598EB)
1229                 return;
1230 
1231         /* If there is no support for either Tx or Rx offload
1232          * we should not be advertising support for IPsec.
1233          */
1234         t_dis = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
1235                 IXGBE_SECTXSTAT_SECTX_OFF_DIS;
1236         r_dis = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
1237                 IXGBE_SECRXSTAT_SECRX_OFF_DIS;
1238         if (t_dis || r_dis)
1239                 return;
1240 
1241         ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
1242         if (!ipsec)
1243                 goto err1;
1244         hash_init(ipsec->rx_sa_list);
1245 
1246         size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1247         ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
1248         if (!ipsec->rx_tbl)
1249                 goto err2;
1250 
1251         size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1252         ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
1253         if (!ipsec->tx_tbl)
1254                 goto err2;
1255 
1256         size = sizeof(struct rx_ip_sa) * IXGBE_IPSEC_MAX_RX_IP_COUNT;
1257         ipsec->ip_tbl = kzalloc(size, GFP_KERNEL);
1258         if (!ipsec->ip_tbl)
1259                 goto err2;
1260 
1261         ipsec->num_rx_sa = 0;
1262         ipsec->num_tx_sa = 0;
1263 
1264         adapter->ipsec = ipsec;
1265         ixgbe_ipsec_stop_engine(adapter);
1266         ixgbe_ipsec_clear_hw_tables(adapter);
1267 
1268         adapter->netdev->xfrmdev_ops = &ixgbe_xfrmdev_ops;
1269 
1270         return;
1271 
1272 err2:
1273         kfree(ipsec->ip_tbl);
1274         kfree(ipsec->rx_tbl);
1275         kfree(ipsec->tx_tbl);
1276         kfree(ipsec);
1277 err1:
1278         netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
1279 }
1280 
1281 /**
1282  * ixgbe_stop_ipsec_offload - tear down the ipsec offload
1283  * @adapter: board private structure
1284  **/
1285 void ixgbe_stop_ipsec_offload(struct ixgbe_adapter *adapter)
1286 {
1287         struct ixgbe_ipsec *ipsec = adapter->ipsec;
1288 
1289         adapter->ipsec = NULL;
1290         if (ipsec) {
1291                 kfree(ipsec->ip_tbl);
1292                 kfree(ipsec->rx_tbl);
1293                 kfree(ipsec->tx_tbl);
1294                 kfree(ipsec);
1295         }
1296 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c

DEFINITIONS
