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.real_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.real_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 == (__force u32)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 == (__force u32)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 != (__force u32)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 != (__force u32)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.real_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 (xs->props.mode != XFRM_MODE_TRANSPORT) {
579 		netdev_err(dev, "Unsupported mode for ipsec offload\n");
580 		return -EINVAL;
581 	}
582 
583 	if (ixgbe_ipsec_check_mgmt_ip(xs)) {
584 		netdev_err(dev, "IPsec IP addr clash with mgmt filters\n");
585 		return -EINVAL;
586 	}
587 
588 	if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
589 		struct rx_sa rsa;
590 
591 		if (xs->calg) {
592 			netdev_err(dev, "Compression offload not supported\n");
593 			return -EINVAL;
594 		}
595 
596 		/* find the first unused index */
597 		ret = ixgbe_ipsec_find_empty_idx(ipsec, true);
598 		if (ret < 0) {
599 			netdev_err(dev, "No space for SA in Rx table!\n");
600 			return ret;
601 		}
602 		sa_idx = (u16)ret;
603 
604 		memset(&rsa, 0, sizeof(rsa));
605 		rsa.used = true;
606 		rsa.xs = xs;
607 
608 		if (rsa.xs->id.proto & IPPROTO_ESP)
609 			rsa.decrypt = xs->ealg || xs->aead;
610 
611 		/* get the key and salt */
612 		ret = ixgbe_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
613 		if (ret) {
614 			netdev_err(dev, "Failed to get key data for Rx SA table\n");
615 			return ret;
616 		}
617 
618 		/* get ip for rx sa table */
619 		if (xs->props.family == AF_INET6)
620 			memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
621 		else
622 			memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
623 
624 		/* The HW does not have a 1:1 mapping from keys to IP addrs, so
625 		 * check for a matching IP addr entry in the table.  If the addr
626 		 * already exists, use it; else find an unused slot and add the
627 		 * addr.  If one does not exist and there are no unused table
628 		 * entries, fail the request.
629 		 */
630 
631 		/* Find an existing match or first not used, and stop looking
632 		 * after we've checked all we know we have.
633 		 */
634 		checked = 0;
635 		match = -1;
636 		first = -1;
637 		for (i = 0;
638 		     i < IXGBE_IPSEC_MAX_RX_IP_COUNT &&
639 		     (checked < ipsec->num_rx_sa || first < 0);
640 		     i++) {
641 			if (ipsec->ip_tbl[i].used) {
642 				if (!memcmp(ipsec->ip_tbl[i].ipaddr,
643 					    rsa.ipaddr, sizeof(rsa.ipaddr))) {
644 					match = i;
645 					break;
646 				}
647 				checked++;
648 			} else if (first < 0) {
649 				first = i;  /* track the first empty seen */
650 			}
651 		}
652 
653 		if (ipsec->num_rx_sa == 0)
654 			first = 0;
655 
656 		if (match >= 0) {
657 			/* addrs are the same, we should use this one */
658 			rsa.iptbl_ind = match;
659 			ipsec->ip_tbl[match].ref_cnt++;
660 
661 		} else if (first >= 0) {
662 			/* no matches, but here's an empty slot */
663 			rsa.iptbl_ind = first;
664 
665 			memcpy(ipsec->ip_tbl[first].ipaddr,
666 			       rsa.ipaddr, sizeof(rsa.ipaddr));
667 			ipsec->ip_tbl[first].ref_cnt = 1;
668 			ipsec->ip_tbl[first].used = true;
669 
670 			ixgbe_ipsec_set_rx_ip(hw, rsa.iptbl_ind, rsa.ipaddr);
671 
672 		} else {
673 			/* no match and no empty slot */
674 			netdev_err(dev, "No space for SA in Rx IP SA table\n");
675 			memset(&rsa, 0, sizeof(rsa));
676 			return -ENOSPC;
677 		}
678 
679 		rsa.mode = IXGBE_RXMOD_VALID;
680 		if (rsa.xs->id.proto & IPPROTO_ESP)
681 			rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
682 		if (rsa.decrypt)
683 			rsa.mode |= IXGBE_RXMOD_DECRYPT;
684 		if (rsa.xs->props.family == AF_INET6)
685 			rsa.mode |= IXGBE_RXMOD_IPV6;
686 
687 		/* the preparations worked, so save the info */
688 		memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
689 
690 		ixgbe_ipsec_set_rx_sa(hw, sa_idx, rsa.xs->id.spi, rsa.key,
691 				      rsa.salt, rsa.mode, rsa.iptbl_ind);
692 		xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
693 
694 		ipsec->num_rx_sa++;
695 
696 		/* hash the new entry for faster search in Rx path */
697 		hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
698 			     (__force u32)rsa.xs->id.spi);
699 	} else {
700 		struct tx_sa tsa;
701 
702 		if (adapter->num_vfs &&
703 		    adapter->bridge_mode != BRIDGE_MODE_VEPA)
704 			return -EOPNOTSUPP;
705 
706 		/* find the first unused index */
707 		ret = ixgbe_ipsec_find_empty_idx(ipsec, false);
708 		if (ret < 0) {
709 			netdev_err(dev, "No space for SA in Tx table\n");
710 			return ret;
711 		}
712 		sa_idx = (u16)ret;
713 
714 		memset(&tsa, 0, sizeof(tsa));
715 		tsa.used = true;
716 		tsa.xs = xs;
717 
718 		if (xs->id.proto & IPPROTO_ESP)
719 			tsa.encrypt = xs->ealg || xs->aead;
720 
721 		ret = ixgbe_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
722 		if (ret) {
723 			netdev_err(dev, "Failed to get key data for Tx SA table\n");
724 			memset(&tsa, 0, sizeof(tsa));
725 			return ret;
726 		}
727 
728 		/* the preparations worked, so save the info */
729 		memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
730 
731 		ixgbe_ipsec_set_tx_sa(hw, sa_idx, tsa.key, tsa.salt);
732 
733 		xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
734 
735 		ipsec->num_tx_sa++;
736 	}
737 
738 	/* enable the engine if not already warmed up */
739 	if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED)) {
740 		ixgbe_ipsec_start_engine(adapter);
741 		adapter->flags2 |= IXGBE_FLAG2_IPSEC_ENABLED;
742 	}
743 
744 	return 0;
745 }
746 
747 /**
748  * ixgbe_ipsec_del_sa - clear out this specific SA
749  * @xs: pointer to transformer state struct
750  **/
751 static void ixgbe_ipsec_del_sa(struct xfrm_state *xs)
752 {
753 	struct net_device *dev = xs->xso.real_dev;
754 	struct ixgbe_adapter *adapter = netdev_priv(dev);
755 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
756 	struct ixgbe_hw *hw = &adapter->hw;
757 	u32 zerobuf[4] = {0, 0, 0, 0};
758 	u16 sa_idx;
759 
760 	if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
761 		struct rx_sa *rsa;
762 		u8 ipi;
763 
764 		sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
765 		rsa = &ipsec->rx_tbl[sa_idx];
766 
767 		if (!rsa->used) {
768 			netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
769 				   sa_idx, xs->xso.offload_handle);
770 			return;
771 		}
772 
773 		ixgbe_ipsec_set_rx_sa(hw, sa_idx, 0, zerobuf, 0, 0, 0);
774 		hash_del_rcu(&rsa->hlist);
775 
776 		/* if the IP table entry is referenced by only this SA,
777 		 * i.e. ref_cnt is only 1, clear the IP table entry as well
778 		 */
779 		ipi = rsa->iptbl_ind;
780 		if (ipsec->ip_tbl[ipi].ref_cnt > 0) {
781 			ipsec->ip_tbl[ipi].ref_cnt--;
782 
783 			if (!ipsec->ip_tbl[ipi].ref_cnt) {
784 				memset(&ipsec->ip_tbl[ipi], 0,
785 				       sizeof(struct rx_ip_sa));
786 				ixgbe_ipsec_set_rx_ip(hw, ipi,
787 						      (__force __be32 *)zerobuf);
788 			}
789 		}
790 
791 		memset(rsa, 0, sizeof(struct rx_sa));
792 		ipsec->num_rx_sa--;
793 	} else {
794 		sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
795 
796 		if (!ipsec->tx_tbl[sa_idx].used) {
797 			netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
798 				   sa_idx, xs->xso.offload_handle);
799 			return;
800 		}
801 
802 		ixgbe_ipsec_set_tx_sa(hw, sa_idx, zerobuf, 0);
803 		memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
804 		ipsec->num_tx_sa--;
805 	}
806 
807 	/* if there are no SAs left, stop the engine to save energy */
808 	if (ipsec->num_rx_sa == 0 && ipsec->num_tx_sa == 0) {
809 		adapter->flags2 &= ~IXGBE_FLAG2_IPSEC_ENABLED;
810 		ixgbe_ipsec_stop_engine(adapter);
811 	}
812 }
813 
814 /**
815  * ixgbe_ipsec_offload_ok - can this packet use the xfrm hw offload
816  * @skb: current data packet
817  * @xs: pointer to transformer state struct
818  **/
819 static bool ixgbe_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
820 {
821 	if (xs->props.family == AF_INET) {
822 		/* Offload with IPv4 options is not supported yet */
823 		if (ip_hdr(skb)->ihl != 5)
824 			return false;
825 	} else {
826 		/* Offload with IPv6 extension headers is not support yet */
827 		if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
828 			return false;
829 	}
830 
831 	return true;
832 }
833 
834 static const struct xfrmdev_ops ixgbe_xfrmdev_ops = {
835 	.xdo_dev_state_add = ixgbe_ipsec_add_sa,
836 	.xdo_dev_state_delete = ixgbe_ipsec_del_sa,
837 	.xdo_dev_offload_ok = ixgbe_ipsec_offload_ok,
838 };
839 
840 /**
841  * ixgbe_ipsec_vf_clear - clear the tables of data for a VF
842  * @adapter: board private structure
843  * @vf: VF id to be removed
844  **/
845 void ixgbe_ipsec_vf_clear(struct ixgbe_adapter *adapter, u32 vf)
846 {
847 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
848 	int i;
849 
850 	if (!ipsec)
851 		return;
852 
853 	/* search rx sa table */
854 	for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_rx_sa; i++) {
855 		if (!ipsec->rx_tbl[i].used)
856 			continue;
857 		if (ipsec->rx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
858 		    ipsec->rx_tbl[i].vf == vf)
859 			ixgbe_ipsec_del_sa(ipsec->rx_tbl[i].xs);
860 	}
861 
862 	/* search tx sa table */
863 	for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_tx_sa; i++) {
864 		if (!ipsec->tx_tbl[i].used)
865 			continue;
866 		if (ipsec->tx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
867 		    ipsec->tx_tbl[i].vf == vf)
868 			ixgbe_ipsec_del_sa(ipsec->tx_tbl[i].xs);
869 	}
870 }
871 
872 /**
873  * ixgbe_ipsec_vf_add_sa - translate VF request to SA add
874  * @adapter: board private structure
875  * @msgbuf: The message buffer
876  * @vf: the VF index
877  *
878  * Make up a new xs and algorithm info from the data sent by the VF.
879  * We only need to sketch in just enough to set up the HW offload.
880  * Put the resulting offload_handle into the return message to the VF.
881  *
882  * Returns 0 or error value
883  **/
884 int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
885 {
886 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
887 	struct xfrm_algo_desc *algo;
888 	struct sa_mbx_msg *sam;
889 	struct xfrm_state *xs;
890 	size_t aead_len;
891 	u16 sa_idx;
892 	u32 pfsa;
893 	int err;
894 
895 	sam = (struct sa_mbx_msg *)(&msgbuf[1]);
896 	if (!adapter->vfinfo[vf].trusted ||
897 	    !(adapter->flags2 & IXGBE_FLAG2_VF_IPSEC_ENABLED)) {
898 		e_warn(drv, "VF %d attempted to add an IPsec SA\n", vf);
899 		err = -EACCES;
900 		goto err_out;
901 	}
902 
903 	/* Tx IPsec offload doesn't seem to work on this
904 	 * device, so block these requests for now.
905 	 */
906 	if (!(sam->flags & XFRM_OFFLOAD_INBOUND)) {
907 		err = -EOPNOTSUPP;
908 		goto err_out;
909 	}
910 
911 	xs = kzalloc(sizeof(*xs), GFP_KERNEL);
912 	if (unlikely(!xs)) {
913 		err = -ENOMEM;
914 		goto err_out;
915 	}
916 
917 	xs->xso.flags = sam->flags;
918 	xs->id.spi = sam->spi;
919 	xs->id.proto = sam->proto;
920 	xs->props.family = sam->family;
921 	if (xs->props.family == AF_INET6)
922 		memcpy(&xs->id.daddr.a6, sam->addr, sizeof(xs->id.daddr.a6));
923 	else
924 		memcpy(&xs->id.daddr.a4, sam->addr, sizeof(xs->id.daddr.a4));
925 	xs->xso.dev = adapter->netdev;
926 
927 	algo = xfrm_aead_get_byname(aes_gcm_name, IXGBE_IPSEC_AUTH_BITS, 1);
928 	if (unlikely(!algo)) {
929 		err = -ENOENT;
930 		goto err_xs;
931 	}
932 
933 	aead_len = sizeof(*xs->aead) + IXGBE_IPSEC_KEY_BITS / 8;
934 	xs->aead = kzalloc(aead_len, GFP_KERNEL);
935 	if (unlikely(!xs->aead)) {
936 		err = -ENOMEM;
937 		goto err_xs;
938 	}
939 
940 	xs->props.ealgo = algo->desc.sadb_alg_id;
941 	xs->geniv = algo->uinfo.aead.geniv;
942 	xs->aead->alg_icv_len = IXGBE_IPSEC_AUTH_BITS;
943 	xs->aead->alg_key_len = IXGBE_IPSEC_KEY_BITS;
944 	memcpy(xs->aead->alg_key, sam->key, sizeof(sam->key));
945 	memcpy(xs->aead->alg_name, aes_gcm_name, sizeof(aes_gcm_name));
946 
947 	/* set up the HW offload */
948 	err = ixgbe_ipsec_add_sa(xs);
949 	if (err)
950 		goto err_aead;
951 
952 	pfsa = xs->xso.offload_handle;
953 	if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
954 		sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
955 		ipsec->rx_tbl[sa_idx].vf = vf;
956 		ipsec->rx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
957 	} else {
958 		sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
959 		ipsec->tx_tbl[sa_idx].vf = vf;
960 		ipsec->tx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
961 	}
962 
963 	msgbuf[1] = xs->xso.offload_handle;
964 
965 	return 0;
966 
967 err_aead:
968 	kfree_sensitive(xs->aead);
969 err_xs:
970 	kfree_sensitive(xs);
971 err_out:
972 	msgbuf[1] = err;
973 	return err;
974 }
975 
976 /**
977  * ixgbe_ipsec_vf_del_sa - translate VF request to SA delete
978  * @adapter: board private structure
979  * @msgbuf: The message buffer
980  * @vf: the VF index
981  *
982  * Given the offload_handle sent by the VF, look for the related SA table
983  * entry and use its xs field to call for a delete of the SA.
984  *
985  * Note: We silently ignore requests to delete entries that are already
986  *       set to unused because when a VF is set to "DOWN", the PF first
987  *       gets a reset and clears all the VF's entries; then the VF's
988  *       XFRM stack sends individual deletes for each entry, which the
989  *       reset already removed.  In the future it might be good to try to
990  *       optimize this so not so many unnecessary delete messages are sent.
991  *
992  * Returns 0 or error value
993  **/
994 int ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
995 {
996 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
997 	struct xfrm_state *xs;
998 	u32 pfsa = msgbuf[1];
999 	u16 sa_idx;
1000 
1001 	if (!adapter->vfinfo[vf].trusted) {
1002 		e_err(drv, "vf %d attempted to delete an SA\n", vf);
1003 		return -EPERM;
1004 	}
1005 
1006 	if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
1007 		struct rx_sa *rsa;
1008 
1009 		sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
1010 		if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1011 			e_err(drv, "vf %d SA index %d out of range\n",
1012 			      vf, sa_idx);
1013 			return -EINVAL;
1014 		}
1015 
1016 		rsa = &ipsec->rx_tbl[sa_idx];
1017 
1018 		if (!rsa->used)
1019 			return 0;
1020 
1021 		if (!(rsa->mode & IXGBE_RXTXMOD_VF) ||
1022 		    rsa->vf != vf) {
1023 			e_err(drv, "vf %d bad Rx SA index %d\n", vf, sa_idx);
1024 			return -ENOENT;
1025 		}
1026 
1027 		xs = ipsec->rx_tbl[sa_idx].xs;
1028 	} else {
1029 		struct tx_sa *tsa;
1030 
1031 		sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
1032 		if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1033 			e_err(drv, "vf %d SA index %d out of range\n",
1034 			      vf, sa_idx);
1035 			return -EINVAL;
1036 		}
1037 
1038 		tsa = &ipsec->tx_tbl[sa_idx];
1039 
1040 		if (!tsa->used)
1041 			return 0;
1042 
1043 		if (!(tsa->mode & IXGBE_RXTXMOD_VF) ||
1044 		    tsa->vf != vf) {
1045 			e_err(drv, "vf %d bad Tx SA index %d\n", vf, sa_idx);
1046 			return -ENOENT;
1047 		}
1048 
1049 		xs = ipsec->tx_tbl[sa_idx].xs;
1050 	}
1051 
1052 	ixgbe_ipsec_del_sa(xs);
1053 
1054 	/* remove the xs that was made-up in the add request */
1055 	kfree_sensitive(xs);
1056 
1057 	return 0;
1058 }
1059 
1060 /**
1061  * ixgbe_ipsec_tx - setup Tx flags for ipsec offload
1062  * @tx_ring: outgoing context
1063  * @first: current data packet
1064  * @itd: ipsec Tx data for later use in building context descriptor
1065  **/
1066 int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
1067 		   struct ixgbe_tx_buffer *first,
1068 		   struct ixgbe_ipsec_tx_data *itd)
1069 {
1070 	struct ixgbe_adapter *adapter = netdev_priv(tx_ring->netdev);
1071 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1072 	struct xfrm_state *xs;
1073 	struct sec_path *sp;
1074 	struct tx_sa *tsa;
1075 
1076 	sp = skb_sec_path(first->skb);
1077 	if (unlikely(!sp->len)) {
1078 		netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
1079 			   __func__, sp->len);
1080 		return 0;
1081 	}
1082 
1083 	xs = xfrm_input_state(first->skb);
1084 	if (unlikely(!xs)) {
1085 		netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
1086 			   __func__, xs);
1087 		return 0;
1088 	}
1089 
1090 	itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
1091 	if (unlikely(itd->sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
1092 		netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
1093 			   __func__, itd->sa_idx, xs->xso.offload_handle);
1094 		return 0;
1095 	}
1096 
1097 	tsa = &ipsec->tx_tbl[itd->sa_idx];
1098 	if (unlikely(!tsa->used)) {
1099 		netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
1100 			   __func__, itd->sa_idx);
1101 		return 0;
1102 	}
1103 
1104 	first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CC;
1105 
1106 	if (xs->id.proto == IPPROTO_ESP) {
1107 
1108 		itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
1109 			      IXGBE_ADVTXD_TUCMD_L4T_TCP;
1110 		if (first->protocol == htons(ETH_P_IP))
1111 			itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
1112 
1113 		/* The actual trailer length is authlen (16 bytes) plus
1114 		 * 2 bytes for the proto and the padlen values, plus
1115 		 * padlen bytes of padding.  This ends up not the same
1116 		 * as the static value found in xs->props.trailer_len (21).
1117 		 *
1118 		 * ... but if we're doing GSO, don't bother as the stack
1119 		 * doesn't add a trailer for those.
1120 		 */
1121 		if (!skb_is_gso(first->skb)) {
1122 			/* The "correct" way to get the auth length would be
1123 			 * to use
1124 			 *    authlen = crypto_aead_authsize(xs->data);
1125 			 * but since we know we only have one size to worry
1126 			 * about * we can let the compiler use the constant
1127 			 * and save us a few CPU cycles.
1128 			 */
1129 			const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
1130 			struct sk_buff *skb = first->skb;
1131 			u8 padlen;
1132 			int ret;
1133 
1134 			ret = skb_copy_bits(skb, skb->len - (authlen + 2),
1135 					    &padlen, 1);
1136 			if (unlikely(ret))
1137 				return 0;
1138 			itd->trailer_len = authlen + 2 + padlen;
1139 		}
1140 	}
1141 	if (tsa->encrypt)
1142 		itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
1143 
1144 	return 1;
1145 }
1146 
1147 /**
1148  * ixgbe_ipsec_rx - decode ipsec bits from Rx descriptor
1149  * @rx_ring: receiving ring
1150  * @rx_desc: receive data descriptor
1151  * @skb: current data packet
1152  *
1153  * Determine if there was an ipsec encapsulation noticed, and if so set up
1154  * the resulting status for later in the receive stack.
1155  **/
1156 void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
1157 		    union ixgbe_adv_rx_desc *rx_desc,
1158 		    struct sk_buff *skb)
1159 {
1160 	struct ixgbe_adapter *adapter = netdev_priv(rx_ring->netdev);
1161 	__le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
1162 	__le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
1163 					     IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
1164 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1165 	struct xfrm_offload *xo = NULL;
1166 	struct xfrm_state *xs = NULL;
1167 	struct ipv6hdr *ip6 = NULL;
1168 	struct iphdr *ip4 = NULL;
1169 	struct sec_path *sp;
1170 	void *daddr;
1171 	__be32 spi;
1172 	u8 *c_hdr;
1173 	u8 proto;
1174 
1175 	/* Find the ip and crypto headers in the data.
1176 	 * We can assume no vlan header in the way, b/c the
1177 	 * hw won't recognize the IPsec packet and anyway the
1178 	 * currently vlan device doesn't support xfrm offload.
1179 	 */
1180 	if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
1181 		ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
1182 		daddr = &ip4->daddr;
1183 		c_hdr = (u8 *)ip4 + ip4->ihl * 4;
1184 	} else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
1185 		ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
1186 		daddr = &ip6->daddr;
1187 		c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
1188 	} else {
1189 		return;
1190 	}
1191 
1192 	switch (pkt_info & ipsec_pkt_types) {
1193 	case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
1194 		spi = ((struct ip_auth_hdr *)c_hdr)->spi;
1195 		proto = IPPROTO_AH;
1196 		break;
1197 	case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
1198 		spi = ((struct ip_esp_hdr *)c_hdr)->spi;
1199 		proto = IPPROTO_ESP;
1200 		break;
1201 	default:
1202 		return;
1203 	}
1204 
1205 	xs = ixgbe_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
1206 	if (unlikely(!xs))
1207 		return;
1208 
1209 	sp = secpath_set(skb);
1210 	if (unlikely(!sp))
1211 		return;
1212 
1213 	sp->xvec[sp->len++] = xs;
1214 	sp->olen++;
1215 	xo = xfrm_offload(skb);
1216 	xo->flags = CRYPTO_DONE;
1217 	xo->status = CRYPTO_SUCCESS;
1218 
1219 	adapter->rx_ipsec++;
1220 }
1221 
1222 /**
1223  * ixgbe_init_ipsec_offload - initialize security registers for IPSec operation
1224  * @adapter: board private structure
1225  **/
1226 void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter)
1227 {
1228 	struct ixgbe_hw *hw = &adapter->hw;
1229 	struct ixgbe_ipsec *ipsec;
1230 	u32 t_dis, r_dis;
1231 	size_t size;
1232 
1233 	if (hw->mac.type == ixgbe_mac_82598EB)
1234 		return;
1235 
1236 	/* If there is no support for either Tx or Rx offload
1237 	 * we should not be advertising support for IPsec.
1238 	 */
1239 	t_dis = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
1240 		IXGBE_SECTXSTAT_SECTX_OFF_DIS;
1241 	r_dis = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
1242 		IXGBE_SECRXSTAT_SECRX_OFF_DIS;
1243 	if (t_dis || r_dis)
1244 		return;
1245 
1246 	ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
1247 	if (!ipsec)
1248 		goto err1;
1249 	hash_init(ipsec->rx_sa_list);
1250 
1251 	size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1252 	ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
1253 	if (!ipsec->rx_tbl)
1254 		goto err2;
1255 
1256 	size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1257 	ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
1258 	if (!ipsec->tx_tbl)
1259 		goto err2;
1260 
1261 	size = sizeof(struct rx_ip_sa) * IXGBE_IPSEC_MAX_RX_IP_COUNT;
1262 	ipsec->ip_tbl = kzalloc(size, GFP_KERNEL);
1263 	if (!ipsec->ip_tbl)
1264 		goto err2;
1265 
1266 	ipsec->num_rx_sa = 0;
1267 	ipsec->num_tx_sa = 0;
1268 
1269 	adapter->ipsec = ipsec;
1270 	ixgbe_ipsec_stop_engine(adapter);
1271 	ixgbe_ipsec_clear_hw_tables(adapter);
1272 
1273 	adapter->netdev->xfrmdev_ops = &ixgbe_xfrmdev_ops;
1274 
1275 	return;
1276 
1277 err2:
1278 	kfree(ipsec->ip_tbl);
1279 	kfree(ipsec->rx_tbl);
1280 	kfree(ipsec->tx_tbl);
1281 	kfree(ipsec);
1282 err1:
1283 	netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
1284 }
1285 
1286 /**
1287  * ixgbe_stop_ipsec_offload - tear down the ipsec offload
1288  * @adapter: board private structure
1289  **/
1290 void ixgbe_stop_ipsec_offload(struct ixgbe_adapter *adapter)
1291 {
1292 	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1293 
1294 	adapter->ipsec = NULL;
1295 	if (ipsec) {
1296 		kfree(ipsec->ip_tbl);
1297 		kfree(ipsec->rx_tbl);
1298 		kfree(ipsec->tx_tbl);
1299 		kfree(ipsec);
1300 	}
1301 }
1302