ixgbe_ipsec.c

   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
  10static const char aes_gcm_name[] = "rfc4106(gcm(aes))";
  11
  12static void ixgbe_ipsec_del_sa(struct net_device *dev, 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 **/
  21static 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 **/
  49static 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 **/
  73static 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 **/
 103static 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 **/
 120static 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 **/
 146static 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 **/
 219static 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 **/
 261static 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 **/
 303void 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(adapter->netdev, 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(adapter->netdev, 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 **/
 355static 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 **/
 392static 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 * @dev: pointer to net device
 421 * @xs: pointer to xfrm_state struct
 422 * @mykey: pointer to key array to populate
 423 * @mysalt: pointer to salt value to populate
 424 *
 425 * This copies the protocol keys and salt to our own data tables.  The
 426 * 82599 family only supports the one algorithm.
 427 **/
 428static int ixgbe_ipsec_parse_proto_keys(struct net_device *dev,
 429					struct xfrm_state *xs,
 430					u32 *mykey, u32 *mysalt)
 431{
 432	unsigned char *key_data;
 433	char *alg_name = NULL;
 434	int key_len;
 435
 436	if (!xs->aead) {
 437		netdev_err(dev, "Unsupported IPsec algorithm\n");
 438		return -EINVAL;
 439	}
 440
 441	if (xs->aead->alg_icv_len != IXGBE_IPSEC_AUTH_BITS) {
 442		netdev_err(dev, "IPsec offload requires %d bit authentication\n",
 443			   IXGBE_IPSEC_AUTH_BITS);
 444		return -EINVAL;
 445	}
 446
 447	key_data = &xs->aead->alg_key[0];
 448	key_len = xs->aead->alg_key_len;
 449	alg_name = xs->aead->alg_name;
 450
 451	if (strcmp(alg_name, aes_gcm_name)) {
 452		netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n",
 453			   aes_gcm_name);
 454		return -EINVAL;
 455	}
 456
 457	/* The key bytes come down in a bigendian array of bytes, so
 458	 * we don't need to do any byteswapping.
 459	 * 160 accounts for 16 byte key and 4 byte salt
 460	 */
 461	if (key_len == IXGBE_IPSEC_KEY_BITS) {
 462		*mysalt = ((u32 *)key_data)[4];
 463	} else if (key_len != (IXGBE_IPSEC_KEY_BITS - (sizeof(*mysalt) * 8))) {
 464		netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
 465		return -EINVAL;
 466	} else {
 467		netdev_info(dev, "IPsec hw offload parameters missing 32 bit salt value\n");
 468		*mysalt = 0;
 469	}
 470	memcpy(mykey, key_data, 16);
 471
 472	return 0;
 473}
 474
 475/**
 476 * ixgbe_ipsec_check_mgmt_ip - make sure there is no clash with mgmt IP filters
 477 * @dev: pointer to net device
 478 * @xs: pointer to transformer state struct
 479 **/
 480static int ixgbe_ipsec_check_mgmt_ip(struct net_device *dev,
 481				     struct xfrm_state *xs)
 482{
 483	struct ixgbe_adapter *adapter = ixgbe_from_netdev(dev);
 484	struct ixgbe_hw *hw = &adapter->hw;
 485	u32 mfval, manc, reg;
 486	int num_filters = 4;
 487	bool manc_ipv4;
 488	u32 bmcipval;
 489	int i, j;
 490
 491#define MANC_EN_IPV4_FILTER      BIT(24)
 492#define MFVAL_IPV4_FILTER_SHIFT  16
 493#define MFVAL_IPV6_FILTER_SHIFT  24
 494#define MIPAF_ARR(_m, _n)        (IXGBE_MIPAF + ((_m) * 0x10) + ((_n) * 4))
 495
 496#define IXGBE_BMCIP(_n)          (0x5050 + ((_n) * 4))
 497#define IXGBE_BMCIPVAL           0x5060
 498#define BMCIP_V4                 0x2
 499#define BMCIP_V6                 0x3
 500#define BMCIP_MASK               0x3
 501
 502	manc = IXGBE_READ_REG(hw, IXGBE_MANC);
 503	manc_ipv4 = !!(manc & MANC_EN_IPV4_FILTER);
 504	mfval = IXGBE_READ_REG(hw, IXGBE_MFVAL);
 505	bmcipval = IXGBE_READ_REG(hw, IXGBE_BMCIPVAL);
 506
 507	if (xs->props.family == AF_INET) {
 508		/* are there any IPv4 filters to check? */
 509		if (manc_ipv4) {
 510			/* the 4 ipv4 filters are all in MIPAF(3, i) */
 511			for (i = 0; i < num_filters; i++) {
 512				if (!(mfval & BIT(MFVAL_IPV4_FILTER_SHIFT + i)))
 513					continue;
 514
 515				reg = IXGBE_READ_REG(hw, MIPAF_ARR(3, i));
 516				if (reg == (__force u32)xs->id.daddr.a4)
 517					return 1;
 518			}
 519		}
 520
 521		if ((bmcipval & BMCIP_MASK) == BMCIP_V4) {
 522			reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(3));
 523			if (reg == (__force u32)xs->id.daddr.a4)
 524				return 1;
 525		}
 526
 527	} else {
 528		/* if there are ipv4 filters, they are in the last ipv6 slot */
 529		if (manc_ipv4)
 530			num_filters = 3;
 531
 532		for (i = 0; i < num_filters; i++) {
 533			if (!(mfval & BIT(MFVAL_IPV6_FILTER_SHIFT + i)))
 534				continue;
 535
 536			for (j = 0; j < 4; j++) {
 537				reg = IXGBE_READ_REG(hw, MIPAF_ARR(i, j));
 538				if (reg != (__force u32)xs->id.daddr.a6[j])
 539					break;
 540			}
 541			if (j == 4)   /* did we match all 4 words? */
 542				return 1;
 543		}
 544
 545		if ((bmcipval & BMCIP_MASK) == BMCIP_V6) {
 546			for (j = 0; j < 4; j++) {
 547				reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(j));
 548				if (reg != (__force u32)xs->id.daddr.a6[j])
 549					break;
 550			}
 551			if (j == 4)   /* did we match all 4 words? */
 552				return 1;
 553		}
 554	}
 555
 556	return 0;
 557}
 558
 559/**
 560 * ixgbe_ipsec_add_sa - program device with a security association
 561 * @dev: pointer to device to program
 562 * @xs: pointer to transformer state struct
 563 * @extack: extack point to fill failure reason
 564 **/
 565static int ixgbe_ipsec_add_sa(struct net_device *dev,
 566			      struct xfrm_state *xs,
 567			      struct netlink_ext_ack *extack)
 568{
 569	struct ixgbe_adapter *adapter = ixgbe_from_netdev(dev);
 570	struct ixgbe_ipsec *ipsec = adapter->ipsec;
 571	struct ixgbe_hw *hw = &adapter->hw;
 572	int checked, match, first;
 573	u16 sa_idx;
 574	int ret;
 575	int i;
 576
 577	if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
 578		NL_SET_ERR_MSG_MOD(extack, "Unsupported protocol for ipsec offload");
 579		return -EINVAL;
 580	}
 581
 582	if (xs->props.mode != XFRM_MODE_TRANSPORT) {
 583		NL_SET_ERR_MSG_MOD(extack, "Unsupported mode for ipsec offload");
 584		return -EINVAL;
 585	}
 586
 587	if (ixgbe_ipsec_check_mgmt_ip(dev, xs)) {
 588		NL_SET_ERR_MSG_MOD(extack, "IPsec IP addr clash with mgmt filters");
 589		return -EINVAL;
 590	}
 591
 592	if (xs->xso.type != XFRM_DEV_OFFLOAD_CRYPTO) {
 593		NL_SET_ERR_MSG_MOD(extack, "Unsupported ipsec offload type");
 594		return -EINVAL;
 595	}
 596
 597	if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
 598		struct rx_sa rsa;
 599
 600		if (xs->calg) {
 601			NL_SET_ERR_MSG_MOD(extack, "Compression offload not supported");
 602			return -EINVAL;
 603		}
 604
 605		/* find the first unused index */
 606		ret = ixgbe_ipsec_find_empty_idx(ipsec, true);
 607		if (ret < 0) {
 608			NL_SET_ERR_MSG_MOD(extack, "No space for SA in Rx table!");
 609			return ret;
 610		}
 611		sa_idx = (u16)ret;
 612
 613		memset(&rsa, 0, sizeof(rsa));
 614		rsa.used = true;
 615		rsa.xs = xs;
 616
 617		if (rsa.xs->id.proto & IPPROTO_ESP)
 618			rsa.decrypt = xs->ealg || xs->aead;
 619
 620		/* get the key and salt */
 621		ret = ixgbe_ipsec_parse_proto_keys(dev, xs, rsa.key, &rsa.salt);
 622		if (ret) {
 623			NL_SET_ERR_MSG_MOD(extack, "Failed to get key data for Rx SA table");
 624			return ret;
 625		}
 626
 627		/* get ip for rx sa table */
 628		if (xs->props.family == AF_INET6)
 629			memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
 630		else
 631			memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
 632
 633		/* The HW does not have a 1:1 mapping from keys to IP addrs, so
 634		 * check for a matching IP addr entry in the table.  If the addr
 635		 * already exists, use it; else find an unused slot and add the
 636		 * addr.  If one does not exist and there are no unused table
 637		 * entries, fail the request.
 638		 */
 639
 640		/* Find an existing match or first not used, and stop looking
 641		 * after we've checked all we know we have.
 642		 */
 643		checked = 0;
 644		match = -1;
 645		first = -1;
 646		for (i = 0;
 647		     i < IXGBE_IPSEC_MAX_RX_IP_COUNT &&
 648		     (checked < ipsec->num_rx_sa || first < 0);
 649		     i++) {
 650			if (ipsec->ip_tbl[i].used) {
 651				if (!memcmp(ipsec->ip_tbl[i].ipaddr,
 652					    rsa.ipaddr, sizeof(rsa.ipaddr))) {
 653					match = i;
 654					break;
 655				}
 656				checked++;
 657			} else if (first < 0) {
 658				first = i;  /* track the first empty seen */
 659			}
 660		}
 661
 662		if (ipsec->num_rx_sa == 0)
 663			first = 0;
 664
 665		if (match >= 0) {
 666			/* addrs are the same, we should use this one */
 667			rsa.iptbl_ind = match;
 668			ipsec->ip_tbl[match].ref_cnt++;
 669
 670		} else if (first >= 0) {
 671			/* no matches, but here's an empty slot */
 672			rsa.iptbl_ind = first;
 673
 674			memcpy(ipsec->ip_tbl[first].ipaddr,
 675			       rsa.ipaddr, sizeof(rsa.ipaddr));
 676			ipsec->ip_tbl[first].ref_cnt = 1;
 677			ipsec->ip_tbl[first].used = true;
 678
 679			ixgbe_ipsec_set_rx_ip(hw, rsa.iptbl_ind, rsa.ipaddr);
 680
 681		} else {
 682			/* no match and no empty slot */
 683			NL_SET_ERR_MSG_MOD(extack, "No space for SA in Rx IP SA table");
 684			memset(&rsa, 0, sizeof(rsa));
 685			return -ENOSPC;
 686		}
 687
 688		rsa.mode = IXGBE_RXMOD_VALID;
 689		if (rsa.xs->id.proto & IPPROTO_ESP)
 690			rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
 691		if (rsa.decrypt)
 692			rsa.mode |= IXGBE_RXMOD_DECRYPT;
 693		if (rsa.xs->props.family == AF_INET6)
 694			rsa.mode |= IXGBE_RXMOD_IPV6;
 695
 696		/* the preparations worked, so save the info */
 697		memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
 698
 699		ixgbe_ipsec_set_rx_sa(hw, sa_idx, rsa.xs->id.spi, rsa.key,
 700				      rsa.salt, rsa.mode, rsa.iptbl_ind);
 701		xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
 702
 703		ipsec->num_rx_sa++;
 704
 705		/* hash the new entry for faster search in Rx path */
 706		hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
 707			     (__force u32)rsa.xs->id.spi);
 708	} else {
 709		struct tx_sa tsa;
 710
 711		if (adapter->num_vfs &&
 712		    adapter->bridge_mode != BRIDGE_MODE_VEPA)
 713			return -EOPNOTSUPP;
 714
 715		/* find the first unused index */
 716		ret = ixgbe_ipsec_find_empty_idx(ipsec, false);
 717		if (ret < 0) {
 718			NL_SET_ERR_MSG_MOD(extack, "No space for SA in Tx table");
 719			return ret;
 720		}
 721		sa_idx = (u16)ret;
 722
 723		memset(&tsa, 0, sizeof(tsa));
 724		tsa.used = true;
 725		tsa.xs = xs;
 726
 727		if (xs->id.proto & IPPROTO_ESP)
 728			tsa.encrypt = xs->ealg || xs->aead;
 729
 730		ret = ixgbe_ipsec_parse_proto_keys(dev, xs, tsa.key, &tsa.salt);
 731		if (ret) {
 732			NL_SET_ERR_MSG_MOD(extack, "Failed to get key data for Tx SA table");
 733			memset(&tsa, 0, sizeof(tsa));
 734			return ret;
 735		}
 736
 737		/* the preparations worked, so save the info */
 738		memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
 739
 740		ixgbe_ipsec_set_tx_sa(hw, sa_idx, tsa.key, tsa.salt);
 741
 742		xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
 743
 744		ipsec->num_tx_sa++;
 745	}
 746
 747	/* enable the engine if not already warmed up */
 748	if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED)) {
 749		ixgbe_ipsec_start_engine(adapter);
 750		adapter->flags2 |= IXGBE_FLAG2_IPSEC_ENABLED;
 751	}
 752
 753	return 0;
 754}
 755
 756/**
 757 * ixgbe_ipsec_del_sa - clear out this specific SA
 758 * @dev: pointer to device to program
 759 * @xs: pointer to transformer state struct
 760 **/
 761static void ixgbe_ipsec_del_sa(struct net_device *dev, struct xfrm_state *xs)
 762{
 763	struct ixgbe_adapter *adapter = ixgbe_from_netdev(dev);
 764	struct ixgbe_ipsec *ipsec = adapter->ipsec;
 765	struct ixgbe_hw *hw = &adapter->hw;
 766	u32 zerobuf[4] = {0, 0, 0, 0};
 767	u16 sa_idx;
 768
 769	if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
 770		struct rx_sa *rsa;
 771		u8 ipi;
 772
 773		sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
 774		rsa = &ipsec->rx_tbl[sa_idx];
 775
 776		if (!rsa->used) {
 777			netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
 778				   sa_idx, xs->xso.offload_handle);
 779			return;
 780		}
 781
 782		ixgbe_ipsec_set_rx_sa(hw, sa_idx, 0, zerobuf, 0, 0, 0);
 783		hash_del_rcu(&rsa->hlist);
 784
 785		/* if the IP table entry is referenced by only this SA,
 786		 * i.e. ref_cnt is only 1, clear the IP table entry as well
 787		 */
 788		ipi = rsa->iptbl_ind;
 789		if (ipsec->ip_tbl[ipi].ref_cnt > 0) {
 790			ipsec->ip_tbl[ipi].ref_cnt--;
 791
 792			if (!ipsec->ip_tbl[ipi].ref_cnt) {
 793				memset(&ipsec->ip_tbl[ipi], 0,
 794				       sizeof(struct rx_ip_sa));
 795				ixgbe_ipsec_set_rx_ip(hw, ipi,
 796						      (__force __be32 *)zerobuf);
 797			}
 798		}
 799
 800		memset(rsa, 0, sizeof(struct rx_sa));
 801		ipsec->num_rx_sa--;
 802	} else {
 803		sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
 804
 805		if (!ipsec->tx_tbl[sa_idx].used) {
 806			netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
 807				   sa_idx, xs->xso.offload_handle);
 808			return;
 809		}
 810
 811		ixgbe_ipsec_set_tx_sa(hw, sa_idx, zerobuf, 0);
 812		memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
 813		ipsec->num_tx_sa--;
 814	}
 815
 816	/* if there are no SAs left, stop the engine to save energy */
 817	if (ipsec->num_rx_sa == 0 && ipsec->num_tx_sa == 0) {
 818		adapter->flags2 &= ~IXGBE_FLAG2_IPSEC_ENABLED;
 819		ixgbe_ipsec_stop_engine(adapter);
 820	}
 821}
 822
 823static const struct xfrmdev_ops ixgbe_xfrmdev_ops = {
 824	.xdo_dev_state_add = ixgbe_ipsec_add_sa,
 825	.xdo_dev_state_delete = ixgbe_ipsec_del_sa,
 826};
 827
 828/**
 829 * ixgbe_ipsec_vf_clear - clear the tables of data for a VF
 830 * @adapter: board private structure
 831 * @vf: VF id to be removed
 832 **/
 833void ixgbe_ipsec_vf_clear(struct ixgbe_adapter *adapter, u32 vf)
 834{
 835	struct ixgbe_ipsec *ipsec = adapter->ipsec;
 836	int i;
 837
 838	if (!ipsec)
 839		return;
 840
 841	/* search rx sa table */
 842	for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_rx_sa; i++) {
 843		if (!ipsec->rx_tbl[i].used)
 844			continue;
 845		if (ipsec->rx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
 846		    ipsec->rx_tbl[i].vf == vf)
 847			ixgbe_ipsec_del_sa(adapter->netdev,
 848					   ipsec->rx_tbl[i].xs);
 849	}
 850
 851	/* search tx sa table */
 852	for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_tx_sa; i++) {
 853		if (!ipsec->tx_tbl[i].used)
 854			continue;
 855		if (ipsec->tx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
 856		    ipsec->tx_tbl[i].vf == vf)
 857			ixgbe_ipsec_del_sa(adapter->netdev,
 858					   ipsec->tx_tbl[i].xs);
 859	}
 860}
 861
 862/**
 863 * ixgbe_ipsec_vf_add_sa - translate VF request to SA add
 864 * @adapter: board private structure
 865 * @msgbuf: The message buffer
 866 * @vf: the VF index
 867 *
 868 * Make up a new xs and algorithm info from the data sent by the VF.
 869 * We only need to sketch in just enough to set up the HW offload.
 870 * Put the resulting offload_handle into the return message to the VF.
 871 *
 872 * Returns 0 or error value
 873 **/
 874int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
 875{
 876	struct ixgbe_ipsec *ipsec = adapter->ipsec;
 877	struct xfrm_algo_desc *algo;
 878	struct sa_mbx_msg *sam;
 879	struct xfrm_state *xs;
 880	size_t aead_len;
 881	u16 sa_idx;
 882	u32 pfsa;
 883	int err;
 884
 885	sam = (struct sa_mbx_msg *)(&msgbuf[1]);
 886	if (!adapter->vfinfo[vf].trusted ||
 887	    !(adapter->flags2 & IXGBE_FLAG2_VF_IPSEC_ENABLED)) {
 888		e_warn(drv, "VF %d attempted to add an IPsec SA\n", vf);
 889		err = -EACCES;
 890		goto err_out;
 891	}
 892
 893	/* Tx IPsec offload doesn't seem to work on this
 894	 * device, so block these requests for now.
 895	 */
 896	if (sam->dir != XFRM_DEV_OFFLOAD_IN) {
 897		err = -EOPNOTSUPP;
 898		goto err_out;
 899	}
 900
 901	algo = xfrm_aead_get_byname(aes_gcm_name, IXGBE_IPSEC_AUTH_BITS, 1);
 902	if (unlikely(!algo)) {
 903		err = -ENOENT;
 904		goto err_out;
 905	}
 906
 907	xs = kzalloc(sizeof(*xs), GFP_ATOMIC);
 908	if (unlikely(!xs)) {
 909		err = -ENOMEM;
 910		goto err_out;
 911	}
 912
 913	xs->xso.dir = sam->dir;
 914	xs->id.spi = sam->spi;
 915	xs->id.proto = sam->proto;
 916	xs->props.family = sam->family;
 917	if (xs->props.family == AF_INET6)
 918		memcpy(&xs->id.daddr.a6, sam->addr, sizeof(xs->id.daddr.a6));
 919	else
 920		memcpy(&xs->id.daddr.a4, sam->addr, sizeof(xs->id.daddr.a4));
 921	xs->xso.dev = adapter->netdev;
 922
 923	aead_len = sizeof(*xs->aead) + IXGBE_IPSEC_KEY_BITS / 8;
 924	xs->aead = kzalloc(aead_len, GFP_ATOMIC);
 925	if (unlikely(!xs->aead)) {
 926		err = -ENOMEM;
 927		goto err_xs;
 928	}
 929
 930	xs->props.ealgo = algo->desc.sadb_alg_id;
 931	xs->geniv = algo->uinfo.aead.geniv;
 932	xs->aead->alg_icv_len = IXGBE_IPSEC_AUTH_BITS;
 933	xs->aead->alg_key_len = IXGBE_IPSEC_KEY_BITS;
 934	memcpy(xs->aead->alg_key, sam->key, sizeof(sam->key));
 935	memcpy(xs->aead->alg_name, aes_gcm_name, sizeof(aes_gcm_name));
 936
 937	/* set up the HW offload */
 938	err = ixgbe_ipsec_add_sa(adapter->netdev, xs, NULL);
 939	if (err)
 940		goto err_aead;
 941
 942	pfsa = xs->xso.offload_handle;
 943	if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
 944		sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
 945		ipsec->rx_tbl[sa_idx].vf = vf;
 946		ipsec->rx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
 947	} else {
 948		sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
 949		ipsec->tx_tbl[sa_idx].vf = vf;
 950		ipsec->tx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
 951	}
 952
 953	msgbuf[1] = xs->xso.offload_handle;
 954
 955	return 0;
 956
 957err_aead:
 958	kfree_sensitive(xs->aead);
 959err_xs:
 960	kfree_sensitive(xs);
 961err_out:
 962	msgbuf[1] = err;
 963	return err;
 964}
 965
 966/**
 967 * ixgbe_ipsec_vf_del_sa - translate VF request to SA delete
 968 * @adapter: board private structure
 969 * @msgbuf: The message buffer
 970 * @vf: the VF index
 971 *
 972 * Given the offload_handle sent by the VF, look for the related SA table
 973 * entry and use its xs field to call for a delete of the SA.
 974 *
 975 * Note: We silently ignore requests to delete entries that are already
 976 *       set to unused because when a VF is set to "DOWN", the PF first
 977 *       gets a reset and clears all the VF's entries; then the VF's
 978 *       XFRM stack sends individual deletes for each entry, which the
 979 *       reset already removed.  In the future it might be good to try to
 980 *       optimize this so not so many unnecessary delete messages are sent.
 981 *
 982 * Returns 0 or error value
 983 **/
 984int ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
 985{
 986	struct ixgbe_ipsec *ipsec = adapter->ipsec;
 987	struct xfrm_state *xs;
 988	u32 pfsa = msgbuf[1];
 989	u16 sa_idx;
 990
 991	if (!adapter->vfinfo[vf].trusted) {
 992		e_err(drv, "vf %d attempted to delete an SA\n", vf);
 993		return -EPERM;
 994	}
 995
 996	if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
 997		struct rx_sa *rsa;
 998
 999		sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
1000		if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1001			e_err(drv, "vf %d SA index %d out of range\n",
1002			      vf, sa_idx);
1003			return -EINVAL;
1004		}
1005
1006		rsa = &ipsec->rx_tbl[sa_idx];
1007
1008		if (!rsa->used)
1009			return 0;
1010
1011		if (!(rsa->mode & IXGBE_RXTXMOD_VF) ||
1012		    rsa->vf != vf) {
1013			e_err(drv, "vf %d bad Rx SA index %d\n", vf, sa_idx);
1014			return -ENOENT;
1015		}
1016
1017		xs = ipsec->rx_tbl[sa_idx].xs;
1018	} else {
1019		struct tx_sa *tsa;
1020
1021		sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
1022		if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1023			e_err(drv, "vf %d SA index %d out of range\n",
1024			      vf, sa_idx);
1025			return -EINVAL;
1026		}
1027
1028		tsa = &ipsec->tx_tbl[sa_idx];
1029
1030		if (!tsa->used)
1031			return 0;
1032
1033		if (!(tsa->mode & IXGBE_RXTXMOD_VF) ||
1034		    tsa->vf != vf) {
1035			e_err(drv, "vf %d bad Tx SA index %d\n", vf, sa_idx);
1036			return -ENOENT;
1037		}
1038
1039		xs = ipsec->tx_tbl[sa_idx].xs;
1040	}
1041
1042	ixgbe_ipsec_del_sa(adapter->netdev, xs);
1043
1044	/* remove the xs that was made-up in the add request */
1045	kfree_sensitive(xs);
1046
1047	return 0;
1048}
1049
1050/**
1051 * ixgbe_ipsec_tx - setup Tx flags for ipsec offload
1052 * @tx_ring: outgoing context
1053 * @first: current data packet
1054 * @itd: ipsec Tx data for later use in building context descriptor
1055 **/
1056int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
1057		   struct ixgbe_tx_buffer *first,
1058		   struct ixgbe_ipsec_tx_data *itd)
1059{
1060	struct ixgbe_adapter *adapter = ixgbe_from_netdev(tx_ring->netdev);
1061	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1062	struct xfrm_state *xs;
1063	struct sec_path *sp;
1064	struct tx_sa *tsa;
1065
1066	sp = skb_sec_path(first->skb);
1067	if (unlikely(!sp->len)) {
1068		netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
1069			   __func__, sp->len);
1070		return 0;
1071	}
1072
1073	xs = xfrm_input_state(first->skb);
1074	if (unlikely(!xs)) {
1075		netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
1076			   __func__, xs);
1077		return 0;
1078	}
1079
1080	itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
1081	if (unlikely(itd->sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
1082		netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
1083			   __func__, itd->sa_idx, xs->xso.offload_handle);
1084		return 0;
1085	}
1086
1087	tsa = &ipsec->tx_tbl[itd->sa_idx];
1088	if (unlikely(!tsa->used)) {
1089		netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
1090			   __func__, itd->sa_idx);
1091		return 0;
1092	}
1093
1094	first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CC;
1095
1096	if (xs->id.proto == IPPROTO_ESP) {
1097
1098		itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
1099			      IXGBE_ADVTXD_TUCMD_L4T_TCP;
1100		if (first->protocol == htons(ETH_P_IP))
1101			itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
1102
1103		/* The actual trailer length is authlen (16 bytes) plus
1104		 * 2 bytes for the proto and the padlen values, plus
1105		 * padlen bytes of padding.  This ends up not the same
1106		 * as the static value found in xs->props.trailer_len (21).
1107		 *
1108		 * ... but if we're doing GSO, don't bother as the stack
1109		 * doesn't add a trailer for those.
1110		 */
1111		if (!skb_is_gso(first->skb)) {
1112			/* The "correct" way to get the auth length would be
1113			 * to use
1114			 *    authlen = crypto_aead_authsize(xs->data);
1115			 * but since we know we only have one size to worry
1116			 * about * we can let the compiler use the constant
1117			 * and save us a few CPU cycles.
1118			 */
1119			const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
1120			struct sk_buff *skb = first->skb;
1121			u8 padlen;
1122			int ret;
1123
1124			ret = skb_copy_bits(skb, skb->len - (authlen + 2),
1125					    &padlen, 1);
1126			if (unlikely(ret))
1127				return 0;
1128			itd->trailer_len = authlen + 2 + padlen;
1129		}
1130	}
1131	if (tsa->encrypt)
1132		itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
1133
1134	return 1;
1135}
1136
1137/**
1138 * ixgbe_ipsec_rx - decode ipsec bits from Rx descriptor
1139 * @rx_ring: receiving ring
1140 * @rx_desc: receive data descriptor
1141 * @skb: current data packet
1142 *
1143 * Determine if there was an ipsec encapsulation noticed, and if so set up
1144 * the resulting status for later in the receive stack.
1145 **/
1146void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
1147		    union ixgbe_adv_rx_desc *rx_desc,
1148		    struct sk_buff *skb)
1149{
1150	struct ixgbe_adapter *adapter = ixgbe_from_netdev(rx_ring->netdev);
1151	__le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
1152	__le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
1153					     IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
1154	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1155	struct xfrm_offload *xo = NULL;
1156	struct xfrm_state *xs = NULL;
1157	struct ipv6hdr *ip6 = NULL;
1158	struct iphdr *ip4 = NULL;
1159	struct sec_path *sp;
1160	void *daddr;
1161	__be32 spi;
1162	u8 *c_hdr;
1163	u8 proto;
1164
1165	/* Find the ip and crypto headers in the data.
1166	 * We can assume no vlan header in the way, b/c the
1167	 * hw won't recognize the IPsec packet and anyway the
1168	 * currently vlan device doesn't support xfrm offload.
1169	 */
1170	if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
1171		ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
1172		daddr = &ip4->daddr;
1173		c_hdr = (u8 *)ip4 + ip4->ihl * 4;
1174	} else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
1175		ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
1176		daddr = &ip6->daddr;
1177		c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
1178	} else {
1179		return;
1180	}
1181
1182	switch (pkt_info & ipsec_pkt_types) {
1183	case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
1184		spi = ((struct ip_auth_hdr *)c_hdr)->spi;
1185		proto = IPPROTO_AH;
1186		break;
1187	case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
1188		spi = ((struct ip_esp_hdr *)c_hdr)->spi;
1189		proto = IPPROTO_ESP;
1190		break;
1191	default:
1192		return;
1193	}
1194
1195	xs = ixgbe_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
1196	if (unlikely(!xs))
1197		return;
1198
1199	sp = secpath_set(skb);
1200	if (unlikely(!sp))
1201		return;
1202
1203	sp->xvec[sp->len++] = xs;
1204	sp->olen++;
1205	xo = xfrm_offload(skb);
1206	xo->flags = CRYPTO_DONE;
1207	xo->status = CRYPTO_SUCCESS;
1208
1209	adapter->rx_ipsec++;
1210}
1211
1212/**
1213 * ixgbe_init_ipsec_offload - initialize security registers for IPSec operation
1214 * @adapter: board private structure
1215 **/
1216void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter)
1217{
1218	struct ixgbe_hw *hw = &adapter->hw;
1219	struct ixgbe_ipsec *ipsec;
1220	u32 t_dis, r_dis;
1221	size_t size;
1222
1223	if (hw->mac.type == ixgbe_mac_82598EB)
1224		return;
1225
1226	/* If there is no support for either Tx or Rx offload
1227	 * we should not be advertising support for IPsec.
1228	 */
1229	t_dis = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
1230		IXGBE_SECTXSTAT_SECTX_OFF_DIS;
1231	r_dis = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
1232		IXGBE_SECRXSTAT_SECRX_OFF_DIS;
1233	if (t_dis || r_dis)
1234		return;
1235
1236	ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
1237	if (!ipsec)
1238		goto err1;
1239	hash_init(ipsec->rx_sa_list);
1240
1241	size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1242	ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
1243	if (!ipsec->rx_tbl)
1244		goto err2;
1245
1246	size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1247	ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
1248	if (!ipsec->tx_tbl)
1249		goto err2;
1250
1251	size = sizeof(struct rx_ip_sa) * IXGBE_IPSEC_MAX_RX_IP_COUNT;
1252	ipsec->ip_tbl = kzalloc(size, GFP_KERNEL);
1253	if (!ipsec->ip_tbl)
1254		goto err2;
1255
1256	ipsec->num_rx_sa = 0;
1257	ipsec->num_tx_sa = 0;
1258
1259	adapter->ipsec = ipsec;
1260	ixgbe_ipsec_stop_engine(adapter);
1261	ixgbe_ipsec_clear_hw_tables(adapter);
1262
1263	adapter->netdev->xfrmdev_ops = &ixgbe_xfrmdev_ops;
1264
1265	return;
1266
1267err2:
1268	kfree(ipsec->ip_tbl);
1269	kfree(ipsec->rx_tbl);
1270	kfree(ipsec->tx_tbl);
1271	kfree(ipsec);
1272err1:
1273	netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
1274}
1275
1276/**
1277 * ixgbe_stop_ipsec_offload - tear down the ipsec offload
1278 * @adapter: board private structure
1279 **/
1280void ixgbe_stop_ipsec_offload(struct ixgbe_adapter *adapter)
1281{
1282	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1283
1284	adapter->ipsec = NULL;
1285	if (ipsec) {
1286		kfree(ipsec->ip_tbl);
1287		kfree(ipsec->rx_tbl);
1288		kfree(ipsec->tx_tbl);
1289		kfree(ipsec);
1290	}
1291}