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 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(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 **/
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 * @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 **/
427static 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 **/
478static 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 * @extack: extack point to fill failure reason
561 **/
562static int ixgbe_ipsec_add_sa(struct xfrm_state *xs,
563			      struct netlink_ext_ack *extack)
564{
565	struct net_device *dev = xs->xso.real_dev;
566	struct ixgbe_adapter *adapter = netdev_priv(dev);
567	struct ixgbe_ipsec *ipsec = adapter->ipsec;
568	struct ixgbe_hw *hw = &adapter->hw;
569	int checked, match, first;
570	u16 sa_idx;
571	int ret;
572	int i;
573
574	if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
575		NL_SET_ERR_MSG_MOD(extack, "Unsupported protocol for ipsec offload");
576		return -EINVAL;
577	}
578
579	if (xs->props.mode != XFRM_MODE_TRANSPORT) {
580		NL_SET_ERR_MSG_MOD(extack, "Unsupported mode for ipsec offload");
581		return -EINVAL;
582	}
583
584	if (ixgbe_ipsec_check_mgmt_ip(xs)) {
585		NL_SET_ERR_MSG_MOD(extack, "IPsec IP addr clash with mgmt filters");
586		return -EINVAL;
587	}
588
589	if (xs->xso.type != XFRM_DEV_OFFLOAD_CRYPTO) {
590		NL_SET_ERR_MSG_MOD(extack, "Unsupported ipsec offload type");
591		return -EINVAL;
592	}
593
594	if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
595		struct rx_sa rsa;
596
597		if (xs->calg) {
598			NL_SET_ERR_MSG_MOD(extack, "Compression offload not supported");
599			return -EINVAL;
600		}
601
602		/* find the first unused index */
603		ret = ixgbe_ipsec_find_empty_idx(ipsec, true);
604		if (ret < 0) {
605			NL_SET_ERR_MSG_MOD(extack, "No space for SA in Rx table!");
606			return ret;
607		}
608		sa_idx = (u16)ret;
609
610		memset(&rsa, 0, sizeof(rsa));
611		rsa.used = true;
612		rsa.xs = xs;
613
614		if (rsa.xs->id.proto & IPPROTO_ESP)
615			rsa.decrypt = xs->ealg || xs->aead;
616
617		/* get the key and salt */
618		ret = ixgbe_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
619		if (ret) {
620			NL_SET_ERR_MSG_MOD(extack, "Failed to get key data for Rx SA table");
621			return ret;
622		}
623
624		/* get ip for rx sa table */
625		if (xs->props.family == AF_INET6)
626			memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
627		else
628			memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
629
630		/* The HW does not have a 1:1 mapping from keys to IP addrs, so
631		 * check for a matching IP addr entry in the table.  If the addr
632		 * already exists, use it; else find an unused slot and add the
633		 * addr.  If one does not exist and there are no unused table
634		 * entries, fail the request.
635		 */
636
637		/* Find an existing match or first not used, and stop looking
638		 * after we've checked all we know we have.
639		 */
640		checked = 0;
641		match = -1;
642		first = -1;
643		for (i = 0;
644		     i < IXGBE_IPSEC_MAX_RX_IP_COUNT &&
645		     (checked < ipsec->num_rx_sa || first < 0);
646		     i++) {
647			if (ipsec->ip_tbl[i].used) {
648				if (!memcmp(ipsec->ip_tbl[i].ipaddr,
649					    rsa.ipaddr, sizeof(rsa.ipaddr))) {
650					match = i;
651					break;
652				}
653				checked++;
654			} else if (first < 0) {
655				first = i;  /* track the first empty seen */
656			}
657		}
658
659		if (ipsec->num_rx_sa == 0)
660			first = 0;
661
662		if (match >= 0) {
663			/* addrs are the same, we should use this one */
664			rsa.iptbl_ind = match;
665			ipsec->ip_tbl[match].ref_cnt++;
666
667		} else if (first >= 0) {
668			/* no matches, but here's an empty slot */
669			rsa.iptbl_ind = first;
670
671			memcpy(ipsec->ip_tbl[first].ipaddr,
672			       rsa.ipaddr, sizeof(rsa.ipaddr));
673			ipsec->ip_tbl[first].ref_cnt = 1;
674			ipsec->ip_tbl[first].used = true;
675
676			ixgbe_ipsec_set_rx_ip(hw, rsa.iptbl_ind, rsa.ipaddr);
677
678		} else {
679			/* no match and no empty slot */
680			NL_SET_ERR_MSG_MOD(extack, "No space for SA in Rx IP SA table");
681			memset(&rsa, 0, sizeof(rsa));
682			return -ENOSPC;
683		}
684
685		rsa.mode = IXGBE_RXMOD_VALID;
686		if (rsa.xs->id.proto & IPPROTO_ESP)
687			rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
688		if (rsa.decrypt)
689			rsa.mode |= IXGBE_RXMOD_DECRYPT;
690		if (rsa.xs->props.family == AF_INET6)
691			rsa.mode |= IXGBE_RXMOD_IPV6;
692
693		/* the preparations worked, so save the info */
694		memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
695
696		ixgbe_ipsec_set_rx_sa(hw, sa_idx, rsa.xs->id.spi, rsa.key,
697				      rsa.salt, rsa.mode, rsa.iptbl_ind);
698		xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
699
700		ipsec->num_rx_sa++;
701
702		/* hash the new entry for faster search in Rx path */
703		hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
704			     (__force u32)rsa.xs->id.spi);
705	} else {
706		struct tx_sa tsa;
707
708		if (adapter->num_vfs &&
709		    adapter->bridge_mode != BRIDGE_MODE_VEPA)
710			return -EOPNOTSUPP;
711
712		/* find the first unused index */
713		ret = ixgbe_ipsec_find_empty_idx(ipsec, false);
714		if (ret < 0) {
715			NL_SET_ERR_MSG_MOD(extack, "No space for SA in Tx table");
716			return ret;
717		}
718		sa_idx = (u16)ret;
719
720		memset(&tsa, 0, sizeof(tsa));
721		tsa.used = true;
722		tsa.xs = xs;
723
724		if (xs->id.proto & IPPROTO_ESP)
725			tsa.encrypt = xs->ealg || xs->aead;
726
727		ret = ixgbe_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
728		if (ret) {
729			NL_SET_ERR_MSG_MOD(extack, "Failed to get key data for Tx SA table");
730			memset(&tsa, 0, sizeof(tsa));
731			return ret;
732		}
733
734		/* the preparations worked, so save the info */
735		memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
736
737		ixgbe_ipsec_set_tx_sa(hw, sa_idx, tsa.key, tsa.salt);
738
739		xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
740
741		ipsec->num_tx_sa++;
742	}
743
744	/* enable the engine if not already warmed up */
745	if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED)) {
746		ixgbe_ipsec_start_engine(adapter);
747		adapter->flags2 |= IXGBE_FLAG2_IPSEC_ENABLED;
748	}
749
750	return 0;
751}
752
753/**
754 * ixgbe_ipsec_del_sa - clear out this specific SA
755 * @xs: pointer to transformer state struct
756 **/
757static void ixgbe_ipsec_del_sa(struct xfrm_state *xs)
758{
759	struct net_device *dev = xs->xso.real_dev;
760	struct ixgbe_adapter *adapter = netdev_priv(dev);
761	struct ixgbe_ipsec *ipsec = adapter->ipsec;
762	struct ixgbe_hw *hw = &adapter->hw;
763	u32 zerobuf[4] = {0, 0, 0, 0};
764	u16 sa_idx;
765
766	if (xs->xso.dir == XFRM_DEV_OFFLOAD_IN) {
767		struct rx_sa *rsa;
768		u8 ipi;
769
770		sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
771		rsa = &ipsec->rx_tbl[sa_idx];
772
773		if (!rsa->used) {
774			netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
775				   sa_idx, xs->xso.offload_handle);
776			return;
777		}
778
779		ixgbe_ipsec_set_rx_sa(hw, sa_idx, 0, zerobuf, 0, 0, 0);
780		hash_del_rcu(&rsa->hlist);
781
782		/* if the IP table entry is referenced by only this SA,
783		 * i.e. ref_cnt is only 1, clear the IP table entry as well
784		 */
785		ipi = rsa->iptbl_ind;
786		if (ipsec->ip_tbl[ipi].ref_cnt > 0) {
787			ipsec->ip_tbl[ipi].ref_cnt--;
788
789			if (!ipsec->ip_tbl[ipi].ref_cnt) {
790				memset(&ipsec->ip_tbl[ipi], 0,
791				       sizeof(struct rx_ip_sa));
792				ixgbe_ipsec_set_rx_ip(hw, ipi,
793						      (__force __be32 *)zerobuf);
794			}
795		}
796
797		memset(rsa, 0, sizeof(struct rx_sa));
798		ipsec->num_rx_sa--;
799	} else {
800		sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
801
802		if (!ipsec->tx_tbl[sa_idx].used) {
803			netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
804				   sa_idx, xs->xso.offload_handle);
805			return;
806		}
807
808		ixgbe_ipsec_set_tx_sa(hw, sa_idx, zerobuf, 0);
809		memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
810		ipsec->num_tx_sa--;
811	}
812
813	/* if there are no SAs left, stop the engine to save energy */
814	if (ipsec->num_rx_sa == 0 && ipsec->num_tx_sa == 0) {
815		adapter->flags2 &= ~IXGBE_FLAG2_IPSEC_ENABLED;
816		ixgbe_ipsec_stop_engine(adapter);
817	}
818}
819
820/**
821 * ixgbe_ipsec_offload_ok - can this packet use the xfrm hw offload
822 * @skb: current data packet
823 * @xs: pointer to transformer state struct
824 **/
825static bool ixgbe_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
826{
827	if (xs->props.family == AF_INET) {
828		/* Offload with IPv4 options is not supported yet */
829		if (ip_hdr(skb)->ihl != 5)
830			return false;
831	} else {
832		/* Offload with IPv6 extension headers is not support yet */
833		if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
834			return false;
835	}
836
837	return true;
838}
839
840static const struct xfrmdev_ops ixgbe_xfrmdev_ops = {
841	.xdo_dev_state_add = ixgbe_ipsec_add_sa,
842	.xdo_dev_state_delete = ixgbe_ipsec_del_sa,
843	.xdo_dev_offload_ok = ixgbe_ipsec_offload_ok,
844};
845
846/**
847 * ixgbe_ipsec_vf_clear - clear the tables of data for a VF
848 * @adapter: board private structure
849 * @vf: VF id to be removed
850 **/
851void ixgbe_ipsec_vf_clear(struct ixgbe_adapter *adapter, u32 vf)
852{
853	struct ixgbe_ipsec *ipsec = adapter->ipsec;
854	int i;
855
856	if (!ipsec)
857		return;
858
859	/* search rx sa table */
860	for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_rx_sa; i++) {
861		if (!ipsec->rx_tbl[i].used)
862			continue;
863		if (ipsec->rx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
864		    ipsec->rx_tbl[i].vf == vf)
865			ixgbe_ipsec_del_sa(ipsec->rx_tbl[i].xs);
866	}
867
868	/* search tx sa table */
869	for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_tx_sa; i++) {
870		if (!ipsec->tx_tbl[i].used)
871			continue;
872		if (ipsec->tx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
873		    ipsec->tx_tbl[i].vf == vf)
874			ixgbe_ipsec_del_sa(ipsec->tx_tbl[i].xs);
875	}
876}
877
878/**
879 * ixgbe_ipsec_vf_add_sa - translate VF request to SA add
880 * @adapter: board private structure
881 * @msgbuf: The message buffer
882 * @vf: the VF index
883 *
884 * Make up a new xs and algorithm info from the data sent by the VF.
885 * We only need to sketch in just enough to set up the HW offload.
886 * Put the resulting offload_handle into the return message to the VF.
887 *
888 * Returns 0 or error value
889 **/
890int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
891{
892	struct ixgbe_ipsec *ipsec = adapter->ipsec;
893	struct xfrm_algo_desc *algo;
894	struct sa_mbx_msg *sam;
895	struct xfrm_state *xs;
896	size_t aead_len;
897	u16 sa_idx;
898	u32 pfsa;
899	int err;
900
901	sam = (struct sa_mbx_msg *)(&msgbuf[1]);
902	if (!adapter->vfinfo[vf].trusted ||
903	    !(adapter->flags2 & IXGBE_FLAG2_VF_IPSEC_ENABLED)) {
904		e_warn(drv, "VF %d attempted to add an IPsec SA\n", vf);
905		err = -EACCES;
906		goto err_out;
907	}
908
909	/* Tx IPsec offload doesn't seem to work on this
910	 * device, so block these requests for now.
911	 */
912	if (sam->dir != XFRM_DEV_OFFLOAD_IN) {
913		err = -EOPNOTSUPP;
914		goto err_out;
915	}
916
917	algo = xfrm_aead_get_byname(aes_gcm_name, IXGBE_IPSEC_AUTH_BITS, 1);
918	if (unlikely(!algo)) {
919		err = -ENOENT;
920		goto err_out;
921	}
922
923	xs = kzalloc(sizeof(*xs), GFP_ATOMIC);
924	if (unlikely(!xs)) {
925		err = -ENOMEM;
926		goto err_out;
927	}
928
929	xs->xso.dir = sam->dir;
930	xs->id.spi = sam->spi;
931	xs->id.proto = sam->proto;
932	xs->props.family = sam->family;
933	if (xs->props.family == AF_INET6)
934		memcpy(&xs->id.daddr.a6, sam->addr, sizeof(xs->id.daddr.a6));
935	else
936		memcpy(&xs->id.daddr.a4, sam->addr, sizeof(xs->id.daddr.a4));
937	xs->xso.dev = adapter->netdev;
938
939	aead_len = sizeof(*xs->aead) + IXGBE_IPSEC_KEY_BITS / 8;
940	xs->aead = kzalloc(aead_len, GFP_ATOMIC);
941	if (unlikely(!xs->aead)) {
942		err = -ENOMEM;
943		goto err_xs;
944	}
945
946	xs->props.ealgo = algo->desc.sadb_alg_id;
947	xs->geniv = algo->uinfo.aead.geniv;
948	xs->aead->alg_icv_len = IXGBE_IPSEC_AUTH_BITS;
949	xs->aead->alg_key_len = IXGBE_IPSEC_KEY_BITS;
950	memcpy(xs->aead->alg_key, sam->key, sizeof(sam->key));
951	memcpy(xs->aead->alg_name, aes_gcm_name, sizeof(aes_gcm_name));
952
953	/* set up the HW offload */
954	err = ixgbe_ipsec_add_sa(xs, NULL);
955	if (err)
956		goto err_aead;
957
958	pfsa = xs->xso.offload_handle;
959	if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
960		sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
961		ipsec->rx_tbl[sa_idx].vf = vf;
962		ipsec->rx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
963	} else {
964		sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
965		ipsec->tx_tbl[sa_idx].vf = vf;
966		ipsec->tx_tbl[sa_idx].mode |= IXGBE_RXTXMOD_VF;
967	}
968
969	msgbuf[1] = xs->xso.offload_handle;
970
971	return 0;
972
973err_aead:
974	kfree_sensitive(xs->aead);
975err_xs:
976	kfree_sensitive(xs);
977err_out:
978	msgbuf[1] = err;
979	return err;
980}
981
982/**
983 * ixgbe_ipsec_vf_del_sa - translate VF request to SA delete
984 * @adapter: board private structure
985 * @msgbuf: The message buffer
986 * @vf: the VF index
987 *
988 * Given the offload_handle sent by the VF, look for the related SA table
989 * entry and use its xs field to call for a delete of the SA.
990 *
991 * Note: We silently ignore requests to delete entries that are already
992 *       set to unused because when a VF is set to "DOWN", the PF first
993 *       gets a reset and clears all the VF's entries; then the VF's
994 *       XFRM stack sends individual deletes for each entry, which the
995 *       reset already removed.  In the future it might be good to try to
996 *       optimize this so not so many unnecessary delete messages are sent.
997 *
998 * Returns 0 or error value
999 **/
1000int ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
1001{
1002	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1003	struct xfrm_state *xs;
1004	u32 pfsa = msgbuf[1];
1005	u16 sa_idx;
1006
1007	if (!adapter->vfinfo[vf].trusted) {
1008		e_err(drv, "vf %d attempted to delete an SA\n", vf);
1009		return -EPERM;
1010	}
1011
1012	if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
1013		struct rx_sa *rsa;
1014
1015		sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
1016		if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1017			e_err(drv, "vf %d SA index %d out of range\n",
1018			      vf, sa_idx);
1019			return -EINVAL;
1020		}
1021
1022		rsa = &ipsec->rx_tbl[sa_idx];
1023
1024		if (!rsa->used)
1025			return 0;
1026
1027		if (!(rsa->mode & IXGBE_RXTXMOD_VF) ||
1028		    rsa->vf != vf) {
1029			e_err(drv, "vf %d bad Rx SA index %d\n", vf, sa_idx);
1030			return -ENOENT;
1031		}
1032
1033		xs = ipsec->rx_tbl[sa_idx].xs;
1034	} else {
1035		struct tx_sa *tsa;
1036
1037		sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
1038		if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1039			e_err(drv, "vf %d SA index %d out of range\n",
1040			      vf, sa_idx);
1041			return -EINVAL;
1042		}
1043
1044		tsa = &ipsec->tx_tbl[sa_idx];
1045
1046		if (!tsa->used)
1047			return 0;
1048
1049		if (!(tsa->mode & IXGBE_RXTXMOD_VF) ||
1050		    tsa->vf != vf) {
1051			e_err(drv, "vf %d bad Tx SA index %d\n", vf, sa_idx);
1052			return -ENOENT;
1053		}
1054
1055		xs = ipsec->tx_tbl[sa_idx].xs;
1056	}
1057
1058	ixgbe_ipsec_del_sa(xs);
1059
1060	/* remove the xs that was made-up in the add request */
1061	kfree_sensitive(xs);
1062
1063	return 0;
1064}
1065
1066/**
1067 * ixgbe_ipsec_tx - setup Tx flags for ipsec offload
1068 * @tx_ring: outgoing context
1069 * @first: current data packet
1070 * @itd: ipsec Tx data for later use in building context descriptor
1071 **/
1072int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
1073		   struct ixgbe_tx_buffer *first,
1074		   struct ixgbe_ipsec_tx_data *itd)
1075{
1076	struct ixgbe_adapter *adapter = netdev_priv(tx_ring->netdev);
1077	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1078	struct xfrm_state *xs;
1079	struct sec_path *sp;
1080	struct tx_sa *tsa;
1081
1082	sp = skb_sec_path(first->skb);
1083	if (unlikely(!sp->len)) {
1084		netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
1085			   __func__, sp->len);
1086		return 0;
1087	}
1088
1089	xs = xfrm_input_state(first->skb);
1090	if (unlikely(!xs)) {
1091		netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
1092			   __func__, xs);
1093		return 0;
1094	}
1095
1096	itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
1097	if (unlikely(itd->sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
1098		netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
1099			   __func__, itd->sa_idx, xs->xso.offload_handle);
1100		return 0;
1101	}
1102
1103	tsa = &ipsec->tx_tbl[itd->sa_idx];
1104	if (unlikely(!tsa->used)) {
1105		netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
1106			   __func__, itd->sa_idx);
1107		return 0;
1108	}
1109
1110	first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CC;
1111
1112	if (xs->id.proto == IPPROTO_ESP) {
1113
1114		itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
1115			      IXGBE_ADVTXD_TUCMD_L4T_TCP;
1116		if (first->protocol == htons(ETH_P_IP))
1117			itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
1118
1119		/* The actual trailer length is authlen (16 bytes) plus
1120		 * 2 bytes for the proto and the padlen values, plus
1121		 * padlen bytes of padding.  This ends up not the same
1122		 * as the static value found in xs->props.trailer_len (21).
1123		 *
1124		 * ... but if we're doing GSO, don't bother as the stack
1125		 * doesn't add a trailer for those.
1126		 */
1127		if (!skb_is_gso(first->skb)) {
1128			/* The "correct" way to get the auth length would be
1129			 * to use
1130			 *    authlen = crypto_aead_authsize(xs->data);
1131			 * but since we know we only have one size to worry
1132			 * about * we can let the compiler use the constant
1133			 * and save us a few CPU cycles.
1134			 */
1135			const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
1136			struct sk_buff *skb = first->skb;
1137			u8 padlen;
1138			int ret;
1139
1140			ret = skb_copy_bits(skb, skb->len - (authlen + 2),
1141					    &padlen, 1);
1142			if (unlikely(ret))
1143				return 0;
1144			itd->trailer_len = authlen + 2 + padlen;
1145		}
1146	}
1147	if (tsa->encrypt)
1148		itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
1149
1150	return 1;
1151}
1152
1153/**
1154 * ixgbe_ipsec_rx - decode ipsec bits from Rx descriptor
1155 * @rx_ring: receiving ring
1156 * @rx_desc: receive data descriptor
1157 * @skb: current data packet
1158 *
1159 * Determine if there was an ipsec encapsulation noticed, and if so set up
1160 * the resulting status for later in the receive stack.
1161 **/
1162void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
1163		    union ixgbe_adv_rx_desc *rx_desc,
1164		    struct sk_buff *skb)
1165{
1166	struct ixgbe_adapter *adapter = netdev_priv(rx_ring->netdev);
1167	__le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
1168	__le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
1169					     IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
1170	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1171	struct xfrm_offload *xo = NULL;
1172	struct xfrm_state *xs = NULL;
1173	struct ipv6hdr *ip6 = NULL;
1174	struct iphdr *ip4 = NULL;
1175	struct sec_path *sp;
1176	void *daddr;
1177	__be32 spi;
1178	u8 *c_hdr;
1179	u8 proto;
1180
1181	/* Find the ip and crypto headers in the data.
1182	 * We can assume no vlan header in the way, b/c the
1183	 * hw won't recognize the IPsec packet and anyway the
1184	 * currently vlan device doesn't support xfrm offload.
1185	 */
1186	if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV4)) {
1187		ip4 = (struct iphdr *)(skb->data + ETH_HLEN);
1188		daddr = &ip4->daddr;
1189		c_hdr = (u8 *)ip4 + ip4->ihl * 4;
1190	} else if (pkt_info & cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPV6)) {
1191		ip6 = (struct ipv6hdr *)(skb->data + ETH_HLEN);
1192		daddr = &ip6->daddr;
1193		c_hdr = (u8 *)ip6 + sizeof(struct ipv6hdr);
1194	} else {
1195		return;
1196	}
1197
1198	switch (pkt_info & ipsec_pkt_types) {
1199	case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH):
1200		spi = ((struct ip_auth_hdr *)c_hdr)->spi;
1201		proto = IPPROTO_AH;
1202		break;
1203	case cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_ESP):
1204		spi = ((struct ip_esp_hdr *)c_hdr)->spi;
1205		proto = IPPROTO_ESP;
1206		break;
1207	default:
1208		return;
1209	}
1210
1211	xs = ixgbe_ipsec_find_rx_state(ipsec, daddr, proto, spi, !!ip4);
1212	if (unlikely(!xs))
1213		return;
1214
1215	sp = secpath_set(skb);
1216	if (unlikely(!sp))
1217		return;
1218
1219	sp->xvec[sp->len++] = xs;
1220	sp->olen++;
1221	xo = xfrm_offload(skb);
1222	xo->flags = CRYPTO_DONE;
1223	xo->status = CRYPTO_SUCCESS;
1224
1225	adapter->rx_ipsec++;
1226}
1227
1228/**
1229 * ixgbe_init_ipsec_offload - initialize security registers for IPSec operation
1230 * @adapter: board private structure
1231 **/
1232void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter)
1233{
1234	struct ixgbe_hw *hw = &adapter->hw;
1235	struct ixgbe_ipsec *ipsec;
1236	u32 t_dis, r_dis;
1237	size_t size;
1238
1239	if (hw->mac.type == ixgbe_mac_82598EB)
1240		return;
1241
1242	/* If there is no support for either Tx or Rx offload
1243	 * we should not be advertising support for IPsec.
1244	 */
1245	t_dis = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
1246		IXGBE_SECTXSTAT_SECTX_OFF_DIS;
1247	r_dis = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
1248		IXGBE_SECRXSTAT_SECRX_OFF_DIS;
1249	if (t_dis || r_dis)
1250		return;
1251
1252	ipsec = kzalloc(sizeof(*ipsec), GFP_KERNEL);
1253	if (!ipsec)
1254		goto err1;
1255	hash_init(ipsec->rx_sa_list);
1256
1257	size = sizeof(struct rx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1258	ipsec->rx_tbl = kzalloc(size, GFP_KERNEL);
1259	if (!ipsec->rx_tbl)
1260		goto err2;
1261
1262	size = sizeof(struct tx_sa) * IXGBE_IPSEC_MAX_SA_COUNT;
1263	ipsec->tx_tbl = kzalloc(size, GFP_KERNEL);
1264	if (!ipsec->tx_tbl)
1265		goto err2;
1266
1267	size = sizeof(struct rx_ip_sa) * IXGBE_IPSEC_MAX_RX_IP_COUNT;
1268	ipsec->ip_tbl = kzalloc(size, GFP_KERNEL);
1269	if (!ipsec->ip_tbl)
1270		goto err2;
1271
1272	ipsec->num_rx_sa = 0;
1273	ipsec->num_tx_sa = 0;
1274
1275	adapter->ipsec = ipsec;
1276	ixgbe_ipsec_stop_engine(adapter);
1277	ixgbe_ipsec_clear_hw_tables(adapter);
1278
1279	adapter->netdev->xfrmdev_ops = &ixgbe_xfrmdev_ops;
1280
1281	return;
1282
1283err2:
1284	kfree(ipsec->ip_tbl);
1285	kfree(ipsec->rx_tbl);
1286	kfree(ipsec->tx_tbl);
1287	kfree(ipsec);
1288err1:
1289	netdev_err(adapter->netdev, "Unable to allocate memory for SA tables");
1290}
1291
1292/**
1293 * ixgbe_stop_ipsec_offload - tear down the ipsec offload
1294 * @adapter: board private structure
1295 **/
1296void ixgbe_stop_ipsec_offload(struct ixgbe_adapter *adapter)
1297{
1298	struct ixgbe_ipsec *ipsec = adapter->ipsec;
1299
1300	adapter->ipsec = NULL;
1301	if (ipsec) {
1302		kfree(ipsec->ip_tbl);
1303		kfree(ipsec->rx_tbl);
1304		kfree(ipsec->tx_tbl);
1305		kfree(ipsec);
1306	}
1307}
1308