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mmc: core: Reset HPI enabled state during re-init and in case of errors
[linux/fpc-iii.git] / drivers / net / ethernet / intel / ixgbe / ixgbe_ipsec.c
blobfd1b0546fd675b87f37598b6f3842933bedf0a6e
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
8 #define IXGBE_IPSEC_KEY_BITS 160
9 static const char aes_gcm_name[] = "rfc4106(gcm(aes))";
10
11 static void ixgbe_ipsec_del_sa(struct xfrm_state *xs);
12
13 /**
14 * ixgbe_ipsec_set_tx_sa - set the Tx SA registers
15 * @hw: hw specific details
16 * @idx: register index to write
17 * @key: key byte array
18 * @salt: salt bytes
19 **/
20 static void ixgbe_ipsec_set_tx_sa(struct ixgbe_hw *hw, u16 idx,
21 u32 key[], u32 salt)
22 {
23 u32 reg;
24 int i;
25
26 for (i = 0; i < 4; i++)
27 IXGBE_WRITE_REG(hw, IXGBE_IPSTXKEY(i),
28 (__force u32)cpu_to_be32(key[3 - i]));
29 IXGBE_WRITE_REG(hw, IXGBE_IPSTXSALT, (__force u32)cpu_to_be32(salt));
30 IXGBE_WRITE_FLUSH(hw);
31
32 reg = IXGBE_READ_REG(hw, IXGBE_IPSTXIDX);
33 reg &= IXGBE_RXTXIDX_IPS_EN;
34 reg |= idx << IXGBE_RXTXIDX_IDX_SHIFT | IXGBE_RXTXIDX_WRITE;
35 IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, reg);
36 IXGBE_WRITE_FLUSH(hw);
37 }
38
39 /**
40 * ixgbe_ipsec_set_rx_item - set an Rx table item
41 * @hw: hw specific details
42 * @idx: register index to write
43 * @tbl: table selector
44 *
45 * Trigger the device to store into a particular Rx table the
46 * data that has already been loaded into the input register
47 **/
48 static void ixgbe_ipsec_set_rx_item(struct ixgbe_hw *hw, u16 idx,
49 enum ixgbe_ipsec_tbl_sel tbl)
50 {
51 u32 reg;
52
53 reg = IXGBE_READ_REG(hw, IXGBE_IPSRXIDX);
54 reg &= IXGBE_RXTXIDX_IPS_EN;
55 reg |= tbl << IXGBE_RXIDX_TBL_SHIFT |
56 idx << IXGBE_RXTXIDX_IDX_SHIFT |
57 IXGBE_RXTXIDX_WRITE;
58 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, reg);
59 IXGBE_WRITE_FLUSH(hw);
60 }
61
62 /**
63 * ixgbe_ipsec_set_rx_sa - set up the register bits to save SA info
64 * @hw: hw specific details
65 * @idx: register index to write
66 * @spi: security parameter index
67 * @key: key byte array
68 * @salt: salt bytes
69 * @mode: rx decrypt control bits
70 * @ip_idx: index into IP table for related IP address
71 **/
72 static void ixgbe_ipsec_set_rx_sa(struct ixgbe_hw *hw, u16 idx, __be32 spi,
73 u32 key[], u32 salt, u32 mode, u32 ip_idx)
74 {
75 int i;
76
77 /* store the SPI (in bigendian) and IPidx */
78 IXGBE_WRITE_REG(hw, IXGBE_IPSRXSPI,
79 (__force u32)cpu_to_le32((__force u32)spi));
80 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPIDX, ip_idx);
81 IXGBE_WRITE_FLUSH(hw);
82
83 ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_spi_tbl);
84
85 /* store the key, salt, and mode */
86 for (i = 0; i < 4; i++)
87 IXGBE_WRITE_REG(hw, IXGBE_IPSRXKEY(i),
88 (__force u32)cpu_to_be32(key[3 - i]));
89 IXGBE_WRITE_REG(hw, IXGBE_IPSRXSALT, (__force u32)cpu_to_be32(salt));
90 IXGBE_WRITE_REG(hw, IXGBE_IPSRXMOD, mode);
91 IXGBE_WRITE_FLUSH(hw);
92
93 ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_key_tbl);
94 }
95
96 /**
97 * ixgbe_ipsec_set_rx_ip - set up the register bits to save SA IP addr info
98 * @hw: hw specific details
99 * @idx: register index to write
100 * @addr: IP address byte array
101 **/
102 static void ixgbe_ipsec_set_rx_ip(struct ixgbe_hw *hw, u16 idx, __be32 addr[])
103 {
104 int i;
105
106 /* store the ip address */
107 for (i = 0; i < 4; i++)
108 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIPADDR(i),
109 (__force u32)cpu_to_le32((__force u32)addr[i]));
110 IXGBE_WRITE_FLUSH(hw);
111
112 ixgbe_ipsec_set_rx_item(hw, idx, ips_rx_ip_tbl);
113 }
114
115 /**
116 * ixgbe_ipsec_clear_hw_tables - because some tables don't get cleared on reset
117 * @adapter: board private structure
118 **/
119 static void ixgbe_ipsec_clear_hw_tables(struct ixgbe_adapter *adapter)
120 {
121 struct ixgbe_hw *hw = &adapter->hw;
122 u32 buf[4] = {0, 0, 0, 0};
123 u16 idx;
124
125 /* disable Rx and Tx SA lookup */
126 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
127 IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
128
129 /* scrub the tables - split the loops for the max of the IP table */
130 for (idx = 0; idx < IXGBE_IPSEC_MAX_RX_IP_COUNT; idx++) {
131 ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
132 ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
133 ixgbe_ipsec_set_rx_ip(hw, idx, (__be32 *)buf);
134 }
135 for (; idx < IXGBE_IPSEC_MAX_SA_COUNT; idx++) {
136 ixgbe_ipsec_set_tx_sa(hw, idx, buf, 0);
137 ixgbe_ipsec_set_rx_sa(hw, idx, 0, buf, 0, 0, 0);
138 }
139 }
140
141 /**
142 * ixgbe_ipsec_stop_data
143 * @adapter: board private structure
144 **/
145 static void ixgbe_ipsec_stop_data(struct ixgbe_adapter *adapter)
146 {
147 struct ixgbe_hw *hw = &adapter->hw;
148 bool link = adapter->link_up;
149 u32 t_rdy, r_rdy;
150 u32 limit;
151 u32 reg;
152
153 /* halt data paths */
154 reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
155 reg |= IXGBE_SECTXCTRL_TX_DIS;
156 IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
157
158 reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
159 reg |= IXGBE_SECRXCTRL_RX_DIS;
160 IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
161
162 /* If both Tx and Rx are ready there are no packets
163 * that we need to flush so the loopback configuration
164 * below is not necessary.
165 */
166 t_rdy = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
167 IXGBE_SECTXSTAT_SECTX_RDY;
168 r_rdy = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
169 IXGBE_SECRXSTAT_SECRX_RDY;
170 if (t_rdy && r_rdy)
171 return;
172
173 /* If the tx fifo doesn't have link, but still has data,
174 * we can't clear the tx sec block. Set the MAC loopback
175 * before block clear
176 */
177 if (!link) {
178 reg = IXGBE_READ_REG(hw, IXGBE_MACC);
179 reg |= IXGBE_MACC_FLU;
180 IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
181
182 reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
183 reg |= IXGBE_HLREG0_LPBK;
184 IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
185
186 IXGBE_WRITE_FLUSH(hw);
187 mdelay(3);
188 }
189
190 /* wait for the paths to empty */
191 limit = 20;
192 do {
193 mdelay(10);
194 t_rdy = IXGBE_READ_REG(hw, IXGBE_SECTXSTAT) &
195 IXGBE_SECTXSTAT_SECTX_RDY;
196 r_rdy = IXGBE_READ_REG(hw, IXGBE_SECRXSTAT) &
197 IXGBE_SECRXSTAT_SECRX_RDY;
198 } while (!(t_rdy && r_rdy) && limit--);
199
200 /* undo loopback if we played with it earlier */
201 if (!link) {
202 reg = IXGBE_READ_REG(hw, IXGBE_MACC);
203 reg &= ~IXGBE_MACC_FLU;
204 IXGBE_WRITE_REG(hw, IXGBE_MACC, reg);
205
206 reg = IXGBE_READ_REG(hw, IXGBE_HLREG0);
207 reg &= ~IXGBE_HLREG0_LPBK;
208 IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg);
209
210 IXGBE_WRITE_FLUSH(hw);
211 }
212 }
213
214 /**
215 * ixgbe_ipsec_stop_engine
216 * @adapter: board private structure
217 **/
218 static void ixgbe_ipsec_stop_engine(struct ixgbe_adapter *adapter)
219 {
220 struct ixgbe_hw *hw = &adapter->hw;
221 u32 reg;
222
223 ixgbe_ipsec_stop_data(adapter);
224
225 /* disable Rx and Tx SA lookup */
226 IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, 0);
227 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, 0);
228
229 /* disable the Rx and Tx engines and full packet store-n-forward */
230 reg = IXGBE_READ_REG(hw, IXGBE_SECTXCTRL);
231 reg |= IXGBE_SECTXCTRL_SECTX_DIS;
232 reg &= ~IXGBE_SECTXCTRL_STORE_FORWARD;
233 IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, reg);
234
235 reg = IXGBE_READ_REG(hw, IXGBE_SECRXCTRL);
236 reg |= IXGBE_SECRXCTRL_SECRX_DIS;
237 IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, reg);
238
239 /* restore the "tx security buffer almost full threshold" to 0x250 */
240 IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, 0x250);
241
242 /* Set minimum IFG between packets back to the default 0x1 */
243 reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
244 reg = (reg & 0xfffffff0) | 0x1;
245 IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
246
247 /* final set for normal (no ipsec offload) processing */
248 IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_SECTX_DIS);
249 IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, IXGBE_SECRXCTRL_SECRX_DIS);
250
251 IXGBE_WRITE_FLUSH(hw);
252 }
253
254 /**
255 * ixgbe_ipsec_start_engine
256 * @adapter: board private structure
257 *
258 * NOTE: this increases power consumption whether being used or not
259 **/
260 static void ixgbe_ipsec_start_engine(struct ixgbe_adapter *adapter)
261 {
262 struct ixgbe_hw *hw = &adapter->hw;
263 u32 reg;
264
265 ixgbe_ipsec_stop_data(adapter);
266
267 /* Set minimum IFG between packets to 3 */
268 reg = IXGBE_READ_REG(hw, IXGBE_SECTXMINIFG);
269 reg = (reg & 0xfffffff0) | 0x3;
270 IXGBE_WRITE_REG(hw, IXGBE_SECTXMINIFG, reg);
271
272 /* Set "tx security buffer almost full threshold" to 0x15 so that the
273 * almost full indication is generated only after buffer contains at
274 * least an entire jumbo packet.
275 */
276 reg = IXGBE_READ_REG(hw, IXGBE_SECTXBUFFAF);
277 reg = (reg & 0xfffffc00) | 0x15;
278 IXGBE_WRITE_REG(hw, IXGBE_SECTXBUFFAF, reg);
279
280 /* restart the data paths by clearing the DISABLE bits */
281 IXGBE_WRITE_REG(hw, IXGBE_SECRXCTRL, 0);
282 IXGBE_WRITE_REG(hw, IXGBE_SECTXCTRL, IXGBE_SECTXCTRL_STORE_FORWARD);
283
284 /* enable Rx and Tx SA lookup */
285 IXGBE_WRITE_REG(hw, IXGBE_IPSTXIDX, IXGBE_RXTXIDX_IPS_EN);
286 IXGBE_WRITE_REG(hw, IXGBE_IPSRXIDX, IXGBE_RXTXIDX_IPS_EN);
287
288 IXGBE_WRITE_FLUSH(hw);
289 }
290
291 /**
292 * ixgbe_ipsec_restore - restore the ipsec HW settings after a reset
293 * @adapter: board private structure
294 *
295 * Reload the HW tables from the SW tables after they've been bashed
296 * by a chip reset.
297 *
298 * Any VF entries are removed from the SW and HW tables since either
299 * (a) the VF also gets reset on PF reset and will ask again for the
300 * offloads, or (b) the VF has been removed by a change in the num_vfs.
301 **/
302 void ixgbe_ipsec_restore(struct ixgbe_adapter *adapter)
303 {
304 struct ixgbe_ipsec *ipsec = adapter->ipsec;
305 struct ixgbe_hw *hw = &adapter->hw;
306 int i;
307
308 if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED))
309 return;
310
311 /* clean up and restart the engine */
312 ixgbe_ipsec_stop_engine(adapter);
313 ixgbe_ipsec_clear_hw_tables(adapter);
314 ixgbe_ipsec_start_engine(adapter);
315
316 /* reload the Rx and Tx keys */
317 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
318 struct rx_sa *r = &ipsec->rx_tbl[i];
319 struct tx_sa *t = &ipsec->tx_tbl[i];
320
321 if (r->used) {
322 if (r->mode & IXGBE_RXTXMOD_VF)
323 ixgbe_ipsec_del_sa(r->xs);
324 else
325 ixgbe_ipsec_set_rx_sa(hw, i, r->xs->id.spi,
326 r->key, r->salt,
327 r->mode, r->iptbl_ind);
328 }
329
330 if (t->used) {
331 if (t->mode & IXGBE_RXTXMOD_VF)
332 ixgbe_ipsec_del_sa(t->xs);
333 else
334 ixgbe_ipsec_set_tx_sa(hw, i, t->key, t->salt);
335 }
336 }
337
338 /* reload the IP addrs */
339 for (i = 0; i < IXGBE_IPSEC_MAX_RX_IP_COUNT; i++) {
340 struct rx_ip_sa *ipsa = &ipsec->ip_tbl[i];
341
342 if (ipsa->used)
343 ixgbe_ipsec_set_rx_ip(hw, i, ipsa->ipaddr);
344 }
345 }
346
347 /**
348 * ixgbe_ipsec_find_empty_idx - find the first unused security parameter index
349 * @ipsec: pointer to ipsec struct
350 * @rxtable: true if we need to look in the Rx table
351 *
352 * Returns the first unused index in either the Rx or Tx SA table
353 **/
354 static int ixgbe_ipsec_find_empty_idx(struct ixgbe_ipsec *ipsec, bool rxtable)
355 {
356 u32 i;
357
358 if (rxtable) {
359 if (ipsec->num_rx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
360 return -ENOSPC;
361
362 /* search rx sa table */
363 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
364 if (!ipsec->rx_tbl[i].used)
365 return i;
366 }
367 } else {
368 if (ipsec->num_tx_sa == IXGBE_IPSEC_MAX_SA_COUNT)
369 return -ENOSPC;
370
371 /* search tx sa table */
372 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT; i++) {
373 if (!ipsec->tx_tbl[i].used)
374 return i;
375 }
376 }
377
378 return -ENOSPC;
379 }
380
381 /**
382 * ixgbe_ipsec_find_rx_state - find the state that matches
383 * @ipsec: pointer to ipsec struct
384 * @daddr: inbound address to match
385 * @proto: protocol to match
386 * @spi: SPI to match
387 * @ip4: true if using an ipv4 address
388 *
389 * Returns a pointer to the matching SA state information
390 **/
391 static struct xfrm_state *ixgbe_ipsec_find_rx_state(struct ixgbe_ipsec *ipsec,
392 __be32 *daddr, u8 proto,
393 __be32 spi, bool ip4)
394 {
395 struct rx_sa *rsa;
396 struct xfrm_state *ret = NULL;
397
398 rcu_read_lock();
399 hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist,
400 (__force u32)spi) {
401 if (rsa->mode & IXGBE_RXTXMOD_VF)
402 continue;
403 if (spi == rsa->xs->id.spi &&
404 ((ip4 && *daddr == rsa->xs->id.daddr.a4) ||
405 (!ip4 && !memcmp(daddr, &rsa->xs->id.daddr.a6,
406 sizeof(rsa->xs->id.daddr.a6)))) &&
407 proto == rsa->xs->id.proto) {
408 ret = rsa->xs;
409 xfrm_state_hold(ret);
410 break;
411 }
412 }
413 rcu_read_unlock();
414 return ret;
415 }
416
417 /**
418 * ixgbe_ipsec_parse_proto_keys - find the key and salt based on the protocol
419 * @xs: pointer to xfrm_state struct
420 * @mykey: pointer to key array to populate
421 * @mysalt: pointer to salt value to populate
422 *
423 * This copies the protocol keys and salt to our own data tables. The
424 * 82599 family only supports the one algorithm.
425 **/
426 static int ixgbe_ipsec_parse_proto_keys(struct xfrm_state *xs,
427 u32 *mykey, u32 *mysalt)
428 {
429 struct net_device *dev = xs->xso.dev;
430 unsigned char *key_data;
431 char *alg_name = NULL;
432 int key_len;
433
434 if (!xs->aead) {
435 netdev_err(dev, "Unsupported IPsec algorithm\n");
436 return -EINVAL;
437 }
438
439 if (xs->aead->alg_icv_len != IXGBE_IPSEC_AUTH_BITS) {
440 netdev_err(dev, "IPsec offload requires %d bit authentication\n",
441 IXGBE_IPSEC_AUTH_BITS);
442 return -EINVAL;
443 }
444
445 key_data = &xs->aead->alg_key[0];
446 key_len = xs->aead->alg_key_len;
447 alg_name = xs->aead->alg_name;
448
449 if (strcmp(alg_name, aes_gcm_name)) {
450 netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n",
451 aes_gcm_name);
452 return -EINVAL;
453 }
454
455 /* The key bytes come down in a bigendian array of bytes, so
456 * we don't need to do any byteswapping.
457 * 160 accounts for 16 byte key and 4 byte salt
458 */
459 if (key_len == IXGBE_IPSEC_KEY_BITS) {
460 *mysalt = ((u32 *)key_data)[4];
461 } else if (key_len != (IXGBE_IPSEC_KEY_BITS - (sizeof(*mysalt) * 8))) {
462 netdev_err(dev, "IPsec hw offload only supports keys up to 128 bits with a 32 bit salt\n");
463 return -EINVAL;
464 } else {
465 netdev_info(dev, "IPsec hw offload parameters missing 32 bit salt value\n");
466 *mysalt = 0;
467 }
468 memcpy(mykey, key_data, 16);
469
470 return 0;
471 }
472
473 /**
474 * ixgbe_ipsec_check_mgmt_ip - make sure there is no clash with mgmt IP filters
475 * @xs: pointer to transformer state struct
476 **/
477 static int ixgbe_ipsec_check_mgmt_ip(struct xfrm_state *xs)
478 {
479 struct net_device *dev = xs->xso.dev;
480 struct ixgbe_adapter *adapter = netdev_priv(dev);
481 struct ixgbe_hw *hw = &adapter->hw;
482 u32 mfval, manc, reg;
483 int num_filters = 4;
484 bool manc_ipv4;
485 u32 bmcipval;
486 int i, j;
487
488 #define MANC_EN_IPV4_FILTER BIT(24)
489 #define MFVAL_IPV4_FILTER_SHIFT 16
490 #define MFVAL_IPV6_FILTER_SHIFT 24
491 #define MIPAF_ARR(_m, _n) (IXGBE_MIPAF + ((_m) * 0x10) + ((_n) * 4))
492
493 #define IXGBE_BMCIP(_n) (0x5050 + ((_n) * 4))
494 #define IXGBE_BMCIPVAL 0x5060
495 #define BMCIP_V4 0x2
496 #define BMCIP_V6 0x3
497 #define BMCIP_MASK 0x3
498
499 manc = IXGBE_READ_REG(hw, IXGBE_MANC);
500 manc_ipv4 = !!(manc & MANC_EN_IPV4_FILTER);
501 mfval = IXGBE_READ_REG(hw, IXGBE_MFVAL);
502 bmcipval = IXGBE_READ_REG(hw, IXGBE_BMCIPVAL);
503
504 if (xs->props.family == AF_INET) {
505 /* are there any IPv4 filters to check? */
506 if (manc_ipv4) {
507 /* the 4 ipv4 filters are all in MIPAF(3, i) */
508 for (i = 0; i < num_filters; i++) {
509 if (!(mfval & BIT(MFVAL_IPV4_FILTER_SHIFT + i)))
510 continue;
511
512 reg = IXGBE_READ_REG(hw, MIPAF_ARR(3, i));
513 if (reg == xs->id.daddr.a4)
514 return 1;
515 }
516 }
517
518 if ((bmcipval & BMCIP_MASK) == BMCIP_V4) {
519 reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(3));
520 if (reg == xs->id.daddr.a4)
521 return 1;
522 }
523
524 } else {
525 /* if there are ipv4 filters, they are in the last ipv6 slot */
526 if (manc_ipv4)
527 num_filters = 3;
528
529 for (i = 0; i < num_filters; i++) {
530 if (!(mfval & BIT(MFVAL_IPV6_FILTER_SHIFT + i)))
531 continue;
532
533 for (j = 0; j < 4; j++) {
534 reg = IXGBE_READ_REG(hw, MIPAF_ARR(i, j));
535 if (reg != xs->id.daddr.a6[j])
536 break;
537 }
538 if (j == 4) /* did we match all 4 words? */
539 return 1;
540 }
541
542 if ((bmcipval & BMCIP_MASK) == BMCIP_V6) {
543 for (j = 0; j < 4; j++) {
544 reg = IXGBE_READ_REG(hw, IXGBE_BMCIP(j));
545 if (reg != xs->id.daddr.a6[j])
546 break;
547 }
548 if (j == 4) /* did we match all 4 words? */
549 return 1;
550 }
551 }
552
553 return 0;
554 }
555
556 /**
557 * ixgbe_ipsec_add_sa - program device with a security association
558 * @xs: pointer to transformer state struct
559 **/
560 static int ixgbe_ipsec_add_sa(struct xfrm_state *xs)
561 {
562 struct net_device *dev = xs->xso.dev;
563 struct ixgbe_adapter *adapter = netdev_priv(dev);
564 struct ixgbe_ipsec *ipsec = adapter->ipsec;
565 struct ixgbe_hw *hw = &adapter->hw;
566 int checked, match, first;
567 u16 sa_idx;
568 int ret;
569 int i;
570
571 if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) {
572 netdev_err(dev, "Unsupported protocol 0x%04x for ipsec offload\n",
573 xs->id.proto);
574 return -EINVAL;
575 }
576
577 if (ixgbe_ipsec_check_mgmt_ip(xs)) {
578 netdev_err(dev, "IPsec IP addr clash with mgmt filters\n");
579 return -EINVAL;
580 }
581
582 if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
583 struct rx_sa rsa;
584
585 if (xs->calg) {
586 netdev_err(dev, "Compression offload not supported\n");
587 return -EINVAL;
588 }
589
590 /* find the first unused index */
591 ret = ixgbe_ipsec_find_empty_idx(ipsec, true);
592 if (ret < 0) {
593 netdev_err(dev, "No space for SA in Rx table!\n");
594 return ret;
595 }
596 sa_idx = (u16)ret;
597
598 memset(&rsa, 0, sizeof(rsa));
599 rsa.used = true;
600 rsa.xs = xs;
601
602 if (rsa.xs->id.proto & IPPROTO_ESP)
603 rsa.decrypt = xs->ealg || xs->aead;
604
605 /* get the key and salt */
606 ret = ixgbe_ipsec_parse_proto_keys(xs, rsa.key, &rsa.salt);
607 if (ret) {
608 netdev_err(dev, "Failed to get key data for Rx SA table\n");
609 return ret;
610 }
611
612 /* get ip for rx sa table */
613 if (xs->props.family == AF_INET6)
614 memcpy(rsa.ipaddr, &xs->id.daddr.a6, 16);
615 else
616 memcpy(&rsa.ipaddr[3], &xs->id.daddr.a4, 4);
617
618 /* The HW does not have a 1:1 mapping from keys to IP addrs, so
619 * check for a matching IP addr entry in the table. If the addr
620 * already exists, use it; else find an unused slot and add the
621 * addr. If one does not exist and there are no unused table
622 * entries, fail the request.
623 */
624
625 /* Find an existing match or first not used, and stop looking
626 * after we've checked all we know we have.
627 */
628 checked = 0;
629 match = -1;
630 first = -1;
631 for (i = 0;
632 i < IXGBE_IPSEC_MAX_RX_IP_COUNT &&
633 (checked < ipsec->num_rx_sa || first < 0);
634 i++) {
635 if (ipsec->ip_tbl[i].used) {
636 if (!memcmp(ipsec->ip_tbl[i].ipaddr,
637 rsa.ipaddr, sizeof(rsa.ipaddr))) {
638 match = i;
639 break;
640 }
641 checked++;
642 } else if (first < 0) {
643 first = i; /* track the first empty seen */
644 }
645 }
646
647 if (ipsec->num_rx_sa == 0)
648 first = 0;
649
650 if (match >= 0) {
651 /* addrs are the same, we should use this one */
652 rsa.iptbl_ind = match;
653 ipsec->ip_tbl[match].ref_cnt++;
654
655 } else if (first >= 0) {
656 /* no matches, but here's an empty slot */
657 rsa.iptbl_ind = first;
658
659 memcpy(ipsec->ip_tbl[first].ipaddr,
660 rsa.ipaddr, sizeof(rsa.ipaddr));
661 ipsec->ip_tbl[first].ref_cnt = 1;
662 ipsec->ip_tbl[first].used = true;
663
664 ixgbe_ipsec_set_rx_ip(hw, rsa.iptbl_ind, rsa.ipaddr);
665
666 } else {
667 /* no match and no empty slot */
668 netdev_err(dev, "No space for SA in Rx IP SA table\n");
669 memset(&rsa, 0, sizeof(rsa));
670 return -ENOSPC;
671 }
672
673 rsa.mode = IXGBE_RXMOD_VALID;
674 if (rsa.xs->id.proto & IPPROTO_ESP)
675 rsa.mode |= IXGBE_RXMOD_PROTO_ESP;
676 if (rsa.decrypt)
677 rsa.mode |= IXGBE_RXMOD_DECRYPT;
678 if (rsa.xs->props.family == AF_INET6)
679 rsa.mode |= IXGBE_RXMOD_IPV6;
680
681 /* the preparations worked, so save the info */
682 memcpy(&ipsec->rx_tbl[sa_idx], &rsa, sizeof(rsa));
683
684 ixgbe_ipsec_set_rx_sa(hw, sa_idx, rsa.xs->id.spi, rsa.key,
685 rsa.salt, rsa.mode, rsa.iptbl_ind);
686 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_RX_INDEX;
687
688 ipsec->num_rx_sa++;
689
690 /* hash the new entry for faster search in Rx path */
691 hash_add_rcu(ipsec->rx_sa_list, &ipsec->rx_tbl[sa_idx].hlist,
692 (__force u32)rsa.xs->id.spi);
693 } else {
694 struct tx_sa tsa;
695
696 if (adapter->num_vfs)
697 return -EOPNOTSUPP;
698
699 /* find the first unused index */
700 ret = ixgbe_ipsec_find_empty_idx(ipsec, false);
701 if (ret < 0) {
702 netdev_err(dev, "No space for SA in Tx table\n");
703 return ret;
704 }
705 sa_idx = (u16)ret;
706
707 memset(&tsa, 0, sizeof(tsa));
708 tsa.used = true;
709 tsa.xs = xs;
710
711 if (xs->id.proto & IPPROTO_ESP)
712 tsa.encrypt = xs->ealg || xs->aead;
713
714 ret = ixgbe_ipsec_parse_proto_keys(xs, tsa.key, &tsa.salt);
715 if (ret) {
716 netdev_err(dev, "Failed to get key data for Tx SA table\n");
717 memset(&tsa, 0, sizeof(tsa));
718 return ret;
719 }
720
721 /* the preparations worked, so save the info */
722 memcpy(&ipsec->tx_tbl[sa_idx], &tsa, sizeof(tsa));
723
724 ixgbe_ipsec_set_tx_sa(hw, sa_idx, tsa.key, tsa.salt);
725
726 xs->xso.offload_handle = sa_idx + IXGBE_IPSEC_BASE_TX_INDEX;
727
728 ipsec->num_tx_sa++;
729 }
730
731 /* enable the engine if not already warmed up */
732 if (!(adapter->flags2 & IXGBE_FLAG2_IPSEC_ENABLED)) {
733 ixgbe_ipsec_start_engine(adapter);
734 adapter->flags2 |= IXGBE_FLAG2_IPSEC_ENABLED;
735 }
736
737 return 0;
738 }
739
740 /**
741 * ixgbe_ipsec_del_sa - clear out this specific SA
742 * @xs: pointer to transformer state struct
743 **/
744 static void ixgbe_ipsec_del_sa(struct xfrm_state *xs)
745 {
746 struct net_device *dev = xs->xso.dev;
747 struct ixgbe_adapter *adapter = netdev_priv(dev);
748 struct ixgbe_ipsec *ipsec = adapter->ipsec;
749 struct ixgbe_hw *hw = &adapter->hw;
750 u32 zerobuf[4] = {0, 0, 0, 0};
751 u16 sa_idx;
752
753 if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) {
754 struct rx_sa *rsa;
755 u8 ipi;
756
757 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_RX_INDEX;
758 rsa = &ipsec->rx_tbl[sa_idx];
759
760 if (!rsa->used) {
761 netdev_err(dev, "Invalid Rx SA selected sa_idx=%d offload_handle=%lu\n",
762 sa_idx, xs->xso.offload_handle);
763 return;
764 }
765
766 ixgbe_ipsec_set_rx_sa(hw, sa_idx, 0, zerobuf, 0, 0, 0);
767 hash_del_rcu(&rsa->hlist);
768
769 /* if the IP table entry is referenced by only this SA,
770 * i.e. ref_cnt is only 1, clear the IP table entry as well
771 */
772 ipi = rsa->iptbl_ind;
773 if (ipsec->ip_tbl[ipi].ref_cnt > 0) {
774 ipsec->ip_tbl[ipi].ref_cnt--;
775
776 if (!ipsec->ip_tbl[ipi].ref_cnt) {
777 memset(&ipsec->ip_tbl[ipi], 0,
778 sizeof(struct rx_ip_sa));
779 ixgbe_ipsec_set_rx_ip(hw, ipi,
780 (__force __be32 *)zerobuf);
781 }
782 }
783
784 memset(rsa, 0, sizeof(struct rx_sa));
785 ipsec->num_rx_sa--;
786 } else {
787 sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
788
789 if (!ipsec->tx_tbl[sa_idx].used) {
790 netdev_err(dev, "Invalid Tx SA selected sa_idx=%d offload_handle=%lu\n",
791 sa_idx, xs->xso.offload_handle);
792 return;
793 }
794
795 ixgbe_ipsec_set_tx_sa(hw, sa_idx, zerobuf, 0);
796 memset(&ipsec->tx_tbl[sa_idx], 0, sizeof(struct tx_sa));
797 ipsec->num_tx_sa--;
798 }
799
800 /* if there are no SAs left, stop the engine to save energy */
801 if (ipsec->num_rx_sa == 0 && ipsec->num_tx_sa == 0) {
802 adapter->flags2 &= ~IXGBE_FLAG2_IPSEC_ENABLED;
803 ixgbe_ipsec_stop_engine(adapter);
804 }
805 }
806
807 /**
808 * ixgbe_ipsec_offload_ok - can this packet use the xfrm hw offload
809 * @skb: current data packet
810 * @xs: pointer to transformer state struct
811 **/
812 static bool ixgbe_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
813 {
814 if (xs->props.family == AF_INET) {
815 /* Offload with IPv4 options is not supported yet */
816 if (ip_hdr(skb)->ihl != 5)
817 return false;
818 } else {
819 /* Offload with IPv6 extension headers is not support yet */
820 if (ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr))
821 return false;
822 }
823
824 return true;
825 }
826
827 static const struct xfrmdev_ops ixgbe_xfrmdev_ops = {
828 .xdo_dev_state_add = ixgbe_ipsec_add_sa,
829 .xdo_dev_state_delete = ixgbe_ipsec_del_sa,
830 .xdo_dev_offload_ok = ixgbe_ipsec_offload_ok,
831 };
832
833 /**
834 * ixgbe_ipsec_vf_clear - clear the tables of data for a VF
835 * @adapter: board private structure
836 * @vf: VF id to be removed
837 **/
838 void ixgbe_ipsec_vf_clear(struct ixgbe_adapter *adapter, u32 vf)
839 {
840 struct ixgbe_ipsec *ipsec = adapter->ipsec;
841 int i;
842
843 /* search rx sa table */
844 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_rx_sa; i++) {
845 if (!ipsec->rx_tbl[i].used)
846 continue;
847 if (ipsec->rx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
848 ipsec->rx_tbl[i].vf == vf)
849 ixgbe_ipsec_del_sa(ipsec->rx_tbl[i].xs);
850 }
851
852 /* search tx sa table */
853 for (i = 0; i < IXGBE_IPSEC_MAX_SA_COUNT && ipsec->num_tx_sa; i++) {
854 if (!ipsec->tx_tbl[i].used)
855 continue;
856 if (ipsec->tx_tbl[i].mode & IXGBE_RXTXMOD_VF &&
857 ipsec->tx_tbl[i].vf == vf)
858 ixgbe_ipsec_del_sa(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 **/
874 int 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->flags & XFRM_OFFLOAD_INBOUND)) {
897 err = -EOPNOTSUPP;
898 goto err_out;
899 }
900
901 xs = kzalloc(sizeof(*xs), GFP_KERNEL);
902 if (unlikely(!xs)) {
903 err = -ENOMEM;
904 goto err_out;
905 }
906
907 xs->xso.flags = sam->flags;
908 xs->id.spi = sam->spi;
909 xs->id.proto = sam->proto;
910 xs->props.family = sam->family;
911 if (xs->props.family == AF_INET6)
912 memcpy(&xs->id.daddr.a6, sam->addr, sizeof(xs->id.daddr.a6));
913 else
914 memcpy(&xs->id.daddr.a4, sam->addr, sizeof(xs->id.daddr.a4));
915 xs->xso.dev = adapter->netdev;
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_xs;
921 }
922
923 aead_len = sizeof(*xs->aead) + IXGBE_IPSEC_KEY_BITS / 8;
924 xs->aead = kzalloc(aead_len, GFP_KERNEL);
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(xs);
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
957 err_aead:
958 memset(xs->aead, 0, sizeof(*xs->aead));
959 kfree(xs->aead);
960 err_xs:
961 memset(xs, 0, sizeof(*xs));
962 kfree(xs);
963 err_out:
964 msgbuf[1] = err;
965 return err;
966 }
967
968 /**
969 * ixgbe_ipsec_vf_del_sa - translate VF request to SA delete
970 * @adapter: board private structure
971 * @msgbuf: The message buffer
972 * @vf: the VF index
973 *
974 * Given the offload_handle sent by the VF, look for the related SA table
975 * entry and use its xs field to call for a delete of the SA.
976 *
977 * Note: We silently ignore requests to delete entries that are already
978 * set to unused because when a VF is set to "DOWN", the PF first
979 * gets a reset and clears all the VF's entries; then the VF's
980 * XFRM stack sends individual deletes for each entry, which the
981 * reset already removed. In the future it might be good to try to
982 * optimize this so not so many unnecessary delete messages are sent.
983 *
984 * Returns 0 or error value
985 **/
986 int ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
987 {
988 struct ixgbe_ipsec *ipsec = adapter->ipsec;
989 struct xfrm_state *xs;
990 u32 pfsa = msgbuf[1];
991 u16 sa_idx;
992
993 if (!adapter->vfinfo[vf].trusted) {
994 e_err(drv, "vf %d attempted to delete an SA\n", vf);
995 return -EPERM;
996 }
997
998 if (pfsa < IXGBE_IPSEC_BASE_TX_INDEX) {
999 struct rx_sa *rsa;
1000
1001 sa_idx = pfsa - IXGBE_IPSEC_BASE_RX_INDEX;
1002 if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1003 e_err(drv, "vf %d SA index %d out of range\n",
1004 vf, sa_idx);
1005 return -EINVAL;
1006 }
1007
1008 rsa = &ipsec->rx_tbl[sa_idx];
1009
1010 if (!rsa->used)
1011 return 0;
1012
1013 if (!(rsa->mode & IXGBE_RXTXMOD_VF) ||
1014 rsa->vf != vf) {
1015 e_err(drv, "vf %d bad Rx SA index %d\n", vf, sa_idx);
1016 return -ENOENT;
1017 }
1018
1019 xs = ipsec->rx_tbl[sa_idx].xs;
1020 } else {
1021 struct tx_sa *tsa;
1022
1023 sa_idx = pfsa - IXGBE_IPSEC_BASE_TX_INDEX;
1024 if (sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT) {
1025 e_err(drv, "vf %d SA index %d out of range\n",
1026 vf, sa_idx);
1027 return -EINVAL;
1028 }
1029
1030 tsa = &ipsec->tx_tbl[sa_idx];
1031
1032 if (!tsa->used)
1033 return 0;
1034
1035 if (!(tsa->mode & IXGBE_RXTXMOD_VF) ||
1036 tsa->vf != vf) {
1037 e_err(drv, "vf %d bad Tx SA index %d\n", vf, sa_idx);
1038 return -ENOENT;
1039 }
1040
1041 xs = ipsec->tx_tbl[sa_idx].xs;
1042 }
1043
1044 ixgbe_ipsec_del_sa(xs);
1045
1046 /* remove the xs that was made-up in the add request */
1047 memset(xs, 0, sizeof(*xs));
1048 kfree(xs);
1049
1050 return 0;
1051 }
1052
1053 /**
1054 * ixgbe_ipsec_tx - setup Tx flags for ipsec offload
1055 * @tx_ring: outgoing context
1056 * @first: current data packet
1057 * @itd: ipsec Tx data for later use in building context descriptor
1058 **/
1059 int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
1060 struct ixgbe_tx_buffer *first,
1061 struct ixgbe_ipsec_tx_data *itd)
1062 {
1063 struct ixgbe_adapter *adapter = netdev_priv(tx_ring->netdev);
1064 struct ixgbe_ipsec *ipsec = adapter->ipsec;
1065 struct xfrm_state *xs;
1066 struct tx_sa *tsa;
1067
1068 if (unlikely(!first->skb->sp->len)) {
1069 netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
1070 __func__, first->skb->sp->len);
1071 return 0;
1072 }
1073
1074 xs = xfrm_input_state(first->skb);
1075 if (unlikely(!xs)) {
1076 netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
1077 __func__, xs);
1078 return 0;
1079 }
1080
1081 itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
1082 if (unlikely(itd->sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
1083 netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
1084 __func__, itd->sa_idx, xs->xso.offload_handle);
1085 return 0;
1086 }
1087
1088 tsa = &ipsec->tx_tbl[itd->sa_idx];
1089 if (unlikely(!tsa->used)) {
1090 netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
1091 __func__, itd->sa_idx);
1092 return 0;
1093 }
1094
1095 first->tx_flags |= IXGBE_TX_FLAGS_IPSEC | IXGBE_TX_FLAGS_CC;
1096
1097 if (xs->id.proto == IPPROTO_ESP) {
1098
1099 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_TYPE_ESP |
1100 IXGBE_ADVTXD_TUCMD_L4T_TCP;
1101 if (first->protocol == htons(ETH_P_IP))
1102 itd->flags |= IXGBE_ADVTXD_TUCMD_IPV4;
1103
1104 /* The actual trailer length is authlen (16 bytes) plus
1105 * 2 bytes for the proto and the padlen values, plus
1106 * padlen bytes of padding. This ends up not the same
1107 * as the static value found in xs->props.trailer_len (21).
1108 *
1109 * ... but if we're doing GSO, don't bother as the stack
1110 * doesn't add a trailer for those.
1111 */
1112 if (!skb_is_gso(first->skb)) {
1113 /* The "correct" way to get the auth length would be
1114 * to use
1115 * authlen = crypto_aead_authsize(xs->data);
1116 * but since we know we only have one size to worry
1117 * about * we can let the compiler use the constant
1118 * and save us a few CPU cycles.
1119 */
1120 const int authlen = IXGBE_IPSEC_AUTH_BITS / 8;
1121 struct sk_buff *skb = first->skb;
1122 u8 padlen;
1123 int ret;
1124
1125 ret = skb_copy_bits(skb, skb->len - (authlen + 2),
1126 &padlen, 1);
1127 if (unlikely(ret))
1128 return 0;
1129 itd->trailer_len = authlen + 2 + padlen;
1130 }
1131 }
1132 if (tsa->encrypt)
1133 itd->flags |= IXGBE_ADVTXD_TUCMD_IPSEC_ENCRYPT_EN;
1134
1135 return 1;
1136 }
1137
1138 /**
1139 * ixgbe_ipsec_rx - decode ipsec bits from Rx descriptor
1140 * @rx_ring: receiving ring
1141 * @rx_desc: receive data descriptor
1142 * @skb: current data packet
1143 *
1144 * Determine if there was an ipsec encapsulation noticed, and if so set up
1145 * the resulting status for later in the receive stack.
1146 **/
1147 void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
1148 union ixgbe_adv_rx_desc *rx_desc,
1149 struct sk_buff *skb)
1150 {
1151 struct ixgbe_adapter *adapter = netdev_priv(rx_ring->netdev);
1152 __le16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
1153 __le16 ipsec_pkt_types = cpu_to_le16(IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
1154 IXGBE_RXDADV_PKTTYPE_IPSEC_ESP);
1155 struct ixgbe_ipsec *ipsec = adapter->ipsec;
1156 struct xfrm_offload *xo = NULL;
1157 struct xfrm_state *xs = NULL;
1158 struct ipv6hdr *ip6 = NULL;
1159 struct iphdr *ip4 = NULL;
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 skb->sp = secpath_dup(skb->sp);
1200 if (unlikely(!skb->sp))
1201 return;
1202
1203 skb->sp->xvec[skb->sp->len++] = xs;
1204 skb->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 **/
1216 void 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
1267 err2:
1268 kfree(ipsec->ip_tbl);
1269 kfree(ipsec->rx_tbl);
1270 kfree(ipsec->tx_tbl);
1271 kfree(ipsec);
1272 err1:
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 **/
1280 void 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 }
Linux with added FPC-III support