1 /*
2 * This file is part of the Chelsio T6 Crypto driver for Linux.
3 *
4 * Copyright (c) 2003-2017 Chelsio Communications, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 *
34 * Written and Maintained by:
35 * Atul Gupta (atul.gupta@chelsio.com)
36 */
37
38 #define pr_fmt(fmt) "ch_ipsec: " fmt
39
40 #include <linux/kernel.h>
41 #include <linux/module.h>
42 #include <linux/skbuff.h>
43 #include <linux/rtnetlink.h>
44 #include <linux/highmem.h>
45 #include <linux/if_vlan.h>
46 #include <linux/ip.h>
47 #include <linux/netdevice.h>
48 #include <net/esp.h>
49 #include <net/xfrm.h>
50 #include <crypto/aes.h>
51 #include <crypto/hash.h>
52 #include <crypto/sha1.h>
53 #include <crypto/sha2.h>
54 #include <crypto/authenc.h>
55 #include <crypto/internal/aead.h>
56 #include <crypto/null.h>
57 #include <crypto/internal/skcipher.h>
58 #include <crypto/aead.h>
59 #include <crypto/scatterwalk.h>
60 #include <crypto/internal/hash.h>
61
62 #include "chcr_ipsec.h"
63
64 /*
65 * Max Tx descriptor space we allow for an Ethernet packet to be inlined
66 * into a WR.
67 */
68 #define MAX_IMM_TX_PKT_LEN 256
69 #define GCM_ESP_IV_SIZE 8
70
71 static LIST_HEAD(uld_ctx_list);
72 static DEFINE_MUTEX(dev_mutex);
73
74 static int ch_ipsec_uld_state_change(void *handle, enum cxgb4_state new_state);
75 static int ch_ipsec_xmit(struct sk_buff *skb, struct net_device *dev);
76 static void *ch_ipsec_uld_add(const struct cxgb4_lld_info *infop);
77 static void ch_ipsec_advance_esn_state(struct xfrm_state *x);
78 static void ch_ipsec_xfrm_free_state(struct net_device *dev,
79 struct xfrm_state *x);
80 static void ch_ipsec_xfrm_del_state(struct net_device *dev,
81 struct xfrm_state *x);
82 static int ch_ipsec_xfrm_add_state(struct net_device *dev,
83 struct xfrm_state *x,
84 struct netlink_ext_ack *extack);
85
86 static const struct xfrmdev_ops ch_ipsec_xfrmdev_ops = {
87 .xdo_dev_state_add = ch_ipsec_xfrm_add_state,
88 .xdo_dev_state_delete = ch_ipsec_xfrm_del_state,
89 .xdo_dev_state_free = ch_ipsec_xfrm_free_state,
90 .xdo_dev_state_advance_esn = ch_ipsec_advance_esn_state,
91 };
92
93 static struct cxgb4_uld_info ch_ipsec_uld_info = {
94 .name = CHIPSEC_DRV_MODULE_NAME,
95 .add = ch_ipsec_uld_add,
96 .state_change = ch_ipsec_uld_state_change,
97 .tx_handler = ch_ipsec_xmit,
98 .xfrmdev_ops = &ch_ipsec_xfrmdev_ops,
99 };
100
ch_ipsec_uld_add(const struct cxgb4_lld_info * infop)101 static void *ch_ipsec_uld_add(const struct cxgb4_lld_info *infop)
102 {
103 struct ipsec_uld_ctx *u_ctx;
104
105 pr_info_once("%s - version %s\n", CHIPSEC_DRV_DESC,
106 CHIPSEC_DRV_VERSION);
107 u_ctx = kzalloc(sizeof(*u_ctx), GFP_KERNEL);
108 if (!u_ctx) {
109 u_ctx = ERR_PTR(-ENOMEM);
110 goto out;
111 }
112 u_ctx->lldi = *infop;
113 out:
114 return u_ctx;
115 }
116
ch_ipsec_uld_state_change(void * handle,enum cxgb4_state new_state)117 static int ch_ipsec_uld_state_change(void *handle, enum cxgb4_state new_state)
118 {
119 struct ipsec_uld_ctx *u_ctx = handle;
120
121 pr_debug("new_state %u\n", new_state);
122 switch (new_state) {
123 case CXGB4_STATE_UP:
124 pr_info("%s: Up\n", pci_name(u_ctx->lldi.pdev));
125 mutex_lock(&dev_mutex);
126 list_add_tail(&u_ctx->entry, &uld_ctx_list);
127 mutex_unlock(&dev_mutex);
128 break;
129 case CXGB4_STATE_START_RECOVERY:
130 case CXGB4_STATE_DOWN:
131 case CXGB4_STATE_DETACH:
132 pr_info("%s: Down\n", pci_name(u_ctx->lldi.pdev));
133 list_del(&u_ctx->entry);
134 break;
135 default:
136 break;
137 }
138
139 return 0;
140 }
141
ch_ipsec_setauthsize(struct xfrm_state * x,struct ipsec_sa_entry * sa_entry)142 static int ch_ipsec_setauthsize(struct xfrm_state *x,
143 struct ipsec_sa_entry *sa_entry)
144 {
145 int hmac_ctrl;
146 int authsize = x->aead->alg_icv_len / 8;
147
148 sa_entry->authsize = authsize;
149
150 switch (authsize) {
151 case ICV_8:
152 hmac_ctrl = CHCR_SCMD_HMAC_CTRL_DIV2;
153 break;
154 case ICV_12:
155 hmac_ctrl = CHCR_SCMD_HMAC_CTRL_IPSEC_96BIT;
156 break;
157 case ICV_16:
158 hmac_ctrl = CHCR_SCMD_HMAC_CTRL_NO_TRUNC;
159 break;
160 default:
161 return -EINVAL;
162 }
163 return hmac_ctrl;
164 }
165
ch_ipsec_setkey(struct xfrm_state * x,struct ipsec_sa_entry * sa_entry)166 static int ch_ipsec_setkey(struct xfrm_state *x,
167 struct ipsec_sa_entry *sa_entry)
168 {
169 int keylen = (x->aead->alg_key_len + 7) / 8;
170 unsigned char *key = x->aead->alg_key;
171 int ck_size, key_ctx_size = 0;
172 unsigned char ghash_h[AEAD_H_SIZE];
173 struct crypto_aes_ctx aes;
174 int ret = 0;
175
176 if (keylen > 3) {
177 keylen -= 4; /* nonce/salt is present in the last 4 bytes */
178 memcpy(sa_entry->salt, key + keylen, 4);
179 }
180
181 if (keylen == AES_KEYSIZE_128) {
182 ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_128;
183 } else if (keylen == AES_KEYSIZE_192) {
184 ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_192;
185 } else if (keylen == AES_KEYSIZE_256) {
186 ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_256;
187 } else {
188 pr_err("GCM: Invalid key length %d\n", keylen);
189 ret = -EINVAL;
190 goto out;
191 }
192
193 memcpy(sa_entry->key, key, keylen);
194 sa_entry->enckey_len = keylen;
195 key_ctx_size = sizeof(struct _key_ctx) +
196 ((DIV_ROUND_UP(keylen, 16)) << 4) +
197 AEAD_H_SIZE;
198
199 sa_entry->key_ctx_hdr = FILL_KEY_CTX_HDR(ck_size,
200 CHCR_KEYCTX_MAC_KEY_SIZE_128,
201 0, 0,
202 key_ctx_size >> 4);
203
204 /* Calculate the H = CIPH(K, 0 repeated 16 times).
205 * It will go in key context
206 */
207 ret = aes_expandkey(&aes, key, keylen);
208 if (ret) {
209 sa_entry->enckey_len = 0;
210 goto out;
211 }
212 memset(ghash_h, 0, AEAD_H_SIZE);
213 aes_encrypt(&aes, ghash_h, ghash_h);
214 memzero_explicit(&aes, sizeof(aes));
215
216 memcpy(sa_entry->key + (DIV_ROUND_UP(sa_entry->enckey_len, 16) *
217 16), ghash_h, AEAD_H_SIZE);
218 sa_entry->kctx_len = ((DIV_ROUND_UP(sa_entry->enckey_len, 16)) << 4) +
219 AEAD_H_SIZE;
220 out:
221 return ret;
222 }
223
224 /*
225 * ch_ipsec_xfrm_add_state
226 * returns 0 on success, negative error if failed to send message to FPGA
227 * positive error if FPGA returned a bad response
228 */
ch_ipsec_xfrm_add_state(struct net_device * dev,struct xfrm_state * x,struct netlink_ext_ack * extack)229 static int ch_ipsec_xfrm_add_state(struct net_device *dev,
230 struct xfrm_state *x,
231 struct netlink_ext_ack *extack)
232 {
233 struct ipsec_sa_entry *sa_entry;
234 int res = 0;
235
236 if (x->props.aalgo != SADB_AALG_NONE) {
237 NL_SET_ERR_MSG_MOD(extack, "Cannot offload authenticated xfrm states");
238 return -EINVAL;
239 }
240 if (x->props.calgo != SADB_X_CALG_NONE) {
241 NL_SET_ERR_MSG_MOD(extack, "Cannot offload compressed xfrm states");
242 return -EINVAL;
243 }
244 if (x->props.family != AF_INET &&
245 x->props.family != AF_INET6) {
246 NL_SET_ERR_MSG_MOD(extack, "Only IPv4/6 xfrm state offloaded");
247 return -EINVAL;
248 }
249 if (x->props.mode != XFRM_MODE_TRANSPORT &&
250 x->props.mode != XFRM_MODE_TUNNEL) {
251 NL_SET_ERR_MSG_MOD(extack, "Only transport and tunnel xfrm offload");
252 return -EINVAL;
253 }
254 if (x->id.proto != IPPROTO_ESP) {
255 NL_SET_ERR_MSG_MOD(extack, "Only ESP xfrm state offloaded");
256 return -EINVAL;
257 }
258 if (x->encap) {
259 NL_SET_ERR_MSG_MOD(extack, "Encapsulated xfrm state not offloaded");
260 return -EINVAL;
261 }
262 if (!x->aead) {
263 NL_SET_ERR_MSG_MOD(extack, "Cannot offload xfrm states without aead");
264 return -EINVAL;
265 }
266 if (x->aead->alg_icv_len != 128 &&
267 x->aead->alg_icv_len != 96) {
268 NL_SET_ERR_MSG_MOD(extack, "Cannot offload xfrm states with AEAD ICV length other than 96b & 128b");
269 return -EINVAL;
270 }
271 if ((x->aead->alg_key_len != 128 + 32) &&
272 (x->aead->alg_key_len != 256 + 32)) {
273 NL_SET_ERR_MSG_MOD(extack, "cannot offload xfrm states with AEAD key length other than 128/256 bit");
274 return -EINVAL;
275 }
276 if (x->tfcpad) {
277 NL_SET_ERR_MSG_MOD(extack, "Cannot offload xfrm states with tfc padding");
278 return -EINVAL;
279 }
280 if (!x->geniv) {
281 NL_SET_ERR_MSG_MOD(extack, "Cannot offload xfrm states without geniv");
282 return -EINVAL;
283 }
284 if (strcmp(x->geniv, "seqiv")) {
285 NL_SET_ERR_MSG_MOD(extack, "Cannot offload xfrm states with geniv other than seqiv");
286 return -EINVAL;
287 }
288 if (x->xso.type != XFRM_DEV_OFFLOAD_CRYPTO) {
289 NL_SET_ERR_MSG_MOD(extack, "Unsupported xfrm offload");
290 return -EINVAL;
291 }
292
293 if (unlikely(!try_module_get(THIS_MODULE))) {
294 NL_SET_ERR_MSG_MOD(extack, "Failed to acquire module reference");
295 return -ENODEV;
296 }
297
298 sa_entry = kzalloc(sizeof(*sa_entry), GFP_KERNEL);
299 if (!sa_entry) {
300 res = -ENOMEM;
301 module_put(THIS_MODULE);
302 goto out;
303 }
304
305 sa_entry->hmac_ctrl = ch_ipsec_setauthsize(x, sa_entry);
306 if (x->props.flags & XFRM_STATE_ESN)
307 sa_entry->esn = 1;
308 ch_ipsec_setkey(x, sa_entry);
309 x->xso.offload_handle = (unsigned long)sa_entry;
310 out:
311 return res;
312 }
313
ch_ipsec_xfrm_del_state(struct net_device * dev,struct xfrm_state * x)314 static void ch_ipsec_xfrm_del_state(struct net_device *dev,
315 struct xfrm_state *x)
316 {
317 /* do nothing */
318 if (!x->xso.offload_handle)
319 return;
320 }
321
ch_ipsec_xfrm_free_state(struct net_device * dev,struct xfrm_state * x)322 static void ch_ipsec_xfrm_free_state(struct net_device *dev,
323 struct xfrm_state *x)
324 {
325 struct ipsec_sa_entry *sa_entry;
326
327 if (!x->xso.offload_handle)
328 return;
329
330 sa_entry = (struct ipsec_sa_entry *)x->xso.offload_handle;
331 kfree(sa_entry);
332 module_put(THIS_MODULE);
333 }
334
ch_ipsec_advance_esn_state(struct xfrm_state * x)335 static void ch_ipsec_advance_esn_state(struct xfrm_state *x)
336 {
337 /* do nothing */
338 if (!x->xso.offload_handle)
339 return;
340 }
341
is_eth_imm(const struct sk_buff * skb,struct ipsec_sa_entry * sa_entry)342 static int is_eth_imm(const struct sk_buff *skb,
343 struct ipsec_sa_entry *sa_entry)
344 {
345 unsigned int kctx_len;
346 int hdrlen;
347
348 kctx_len = sa_entry->kctx_len;
349 hdrlen = sizeof(struct fw_ulptx_wr) +
350 sizeof(struct chcr_ipsec_req) + kctx_len;
351
352 hdrlen += sizeof(struct cpl_tx_pkt);
353 if (sa_entry->esn)
354 hdrlen += (DIV_ROUND_UP(sizeof(struct chcr_ipsec_aadiv), 16)
355 << 4);
356 if (skb->len <= MAX_IMM_TX_PKT_LEN - hdrlen)
357 return hdrlen;
358 return 0;
359 }
360
calc_tx_sec_flits(const struct sk_buff * skb,struct ipsec_sa_entry * sa_entry,bool * immediate)361 static unsigned int calc_tx_sec_flits(const struct sk_buff *skb,
362 struct ipsec_sa_entry *sa_entry,
363 bool *immediate)
364 {
365 unsigned int kctx_len;
366 unsigned int flits;
367 int aadivlen;
368 int hdrlen;
369
370 kctx_len = sa_entry->kctx_len;
371 hdrlen = is_eth_imm(skb, sa_entry);
372 aadivlen = sa_entry->esn ? DIV_ROUND_UP(sizeof(struct chcr_ipsec_aadiv),
373 16) : 0;
374 aadivlen <<= 4;
375
376 /* If the skb is small enough, we can pump it out as a work request
377 * with only immediate data. In that case we just have to have the
378 * TX Packet header plus the skb data in the Work Request.
379 */
380
381 if (hdrlen) {
382 *immediate = true;
383 return DIV_ROUND_UP(skb->len + hdrlen, sizeof(__be64));
384 }
385
386 flits = sgl_len(skb_shinfo(skb)->nr_frags + 1);
387
388 /* Otherwise, we're going to have to construct a Scatter gather list
389 * of the skb body and fragments. We also include the flits necessary
390 * for the TX Packet Work Request and CPL. We always have a firmware
391 * Write Header (incorporated as part of the cpl_tx_pkt_lso and
392 * cpl_tx_pkt structures), followed by either a TX Packet Write CPL
393 * message or, if we're doing a Large Send Offload, an LSO CPL message
394 * with an embedded TX Packet Write CPL message.
395 */
396 flits += (sizeof(struct fw_ulptx_wr) +
397 sizeof(struct chcr_ipsec_req) +
398 kctx_len +
399 sizeof(struct cpl_tx_pkt_core) +
400 aadivlen) / sizeof(__be64);
401 return flits;
402 }
403
copy_esn_pktxt(struct sk_buff * skb,struct net_device * dev,void * pos,struct ipsec_sa_entry * sa_entry)404 static void *copy_esn_pktxt(struct sk_buff *skb,
405 struct net_device *dev,
406 void *pos,
407 struct ipsec_sa_entry *sa_entry)
408 {
409 struct chcr_ipsec_aadiv *aadiv;
410 struct ulptx_idata *sc_imm;
411 struct ip_esp_hdr *esphdr;
412 struct xfrm_offload *xo;
413 struct sge_eth_txq *q;
414 struct adapter *adap;
415 struct port_info *pi;
416 __be64 seqno;
417 u32 qidx;
418 u32 seqlo;
419 u8 *iv;
420 int eoq;
421 int len;
422
423 pi = netdev_priv(dev);
424 adap = pi->adapter;
425 qidx = skb->queue_mapping;
426 q = &adap->sge.ethtxq[qidx + pi->first_qset];
427
428 /* end of queue, reset pos to start of queue */
429 eoq = (void *)q->q.stat - pos;
430 if (!eoq)
431 pos = q->q.desc;
432
433 len = DIV_ROUND_UP(sizeof(struct chcr_ipsec_aadiv), 16) << 4;
434 memset(pos, 0, len);
435 aadiv = (struct chcr_ipsec_aadiv *)pos;
436 esphdr = (struct ip_esp_hdr *)skb_transport_header(skb);
437 iv = skb_transport_header(skb) + sizeof(struct ip_esp_hdr);
438 xo = xfrm_offload(skb);
439
440 aadiv->spi = (esphdr->spi);
441 seqlo = ntohl(esphdr->seq_no);
442 seqno = cpu_to_be64(seqlo + ((u64)xo->seq.hi << 32));
443 memcpy(aadiv->seq_no, &seqno, 8);
444 iv = skb_transport_header(skb) + sizeof(struct ip_esp_hdr);
445 memcpy(aadiv->iv, iv, 8);
446
447 if (is_eth_imm(skb, sa_entry) && !skb_is_nonlinear(skb)) {
448 sc_imm = (struct ulptx_idata *)(pos +
449 (DIV_ROUND_UP(sizeof(struct chcr_ipsec_aadiv),
450 sizeof(__be64)) << 3));
451 sc_imm->cmd_more = FILL_CMD_MORE(0);
452 sc_imm->len = cpu_to_be32(skb->len);
453 }
454 pos += len;
455 return pos;
456 }
457
copy_cpltx_pktxt(struct sk_buff * skb,struct net_device * dev,void * pos,struct ipsec_sa_entry * sa_entry)458 static void *copy_cpltx_pktxt(struct sk_buff *skb,
459 struct net_device *dev,
460 void *pos,
461 struct ipsec_sa_entry *sa_entry)
462 {
463 struct cpl_tx_pkt_core *cpl;
464 struct sge_eth_txq *q;
465 struct adapter *adap;
466 struct port_info *pi;
467 u32 ctrl0, qidx;
468 u64 cntrl = 0;
469 int left;
470
471 pi = netdev_priv(dev);
472 adap = pi->adapter;
473 qidx = skb->queue_mapping;
474 q = &adap->sge.ethtxq[qidx + pi->first_qset];
475
476 left = (void *)q->q.stat - pos;
477 if (!left)
478 pos = q->q.desc;
479
480 cpl = (struct cpl_tx_pkt_core *)pos;
481
482 cntrl = TXPKT_L4CSUM_DIS_F | TXPKT_IPCSUM_DIS_F;
483 ctrl0 = TXPKT_OPCODE_V(CPL_TX_PKT_XT) | TXPKT_INTF_V(pi->tx_chan) |
484 TXPKT_PF_V(adap->pf);
485 if (skb_vlan_tag_present(skb)) {
486 q->vlan_ins++;
487 cntrl |= TXPKT_VLAN_VLD_F | TXPKT_VLAN_V(skb_vlan_tag_get(skb));
488 }
489
490 cpl->ctrl0 = htonl(ctrl0);
491 cpl->pack = htons(0);
492 cpl->len = htons(skb->len);
493 cpl->ctrl1 = cpu_to_be64(cntrl);
494
495 pos += sizeof(struct cpl_tx_pkt_core);
496 /* Copy ESN info for HW */
497 if (sa_entry->esn)
498 pos = copy_esn_pktxt(skb, dev, pos, sa_entry);
499 return pos;
500 }
501
copy_key_cpltx_pktxt(struct sk_buff * skb,struct net_device * dev,void * pos,struct ipsec_sa_entry * sa_entry)502 static void *copy_key_cpltx_pktxt(struct sk_buff *skb,
503 struct net_device *dev,
504 void *pos,
505 struct ipsec_sa_entry *sa_entry)
506 {
507 struct _key_ctx *key_ctx;
508 int left, eoq, key_len;
509 struct sge_eth_txq *q;
510 struct adapter *adap;
511 struct port_info *pi;
512 unsigned int qidx;
513
514 pi = netdev_priv(dev);
515 adap = pi->adapter;
516 qidx = skb->queue_mapping;
517 q = &adap->sge.ethtxq[qidx + pi->first_qset];
518 key_len = sa_entry->kctx_len;
519
520 /* end of queue, reset pos to start of queue */
521 eoq = (void *)q->q.stat - pos;
522 left = eoq;
523 if (!eoq) {
524 pos = q->q.desc;
525 left = 64 * q->q.size;
526 }
527
528 /* Copy the Key context header */
529 key_ctx = (struct _key_ctx *)pos;
530 key_ctx->ctx_hdr = sa_entry->key_ctx_hdr;
531 memcpy(key_ctx->salt, sa_entry->salt, MAX_SALT);
532 pos += sizeof(struct _key_ctx);
533 left -= sizeof(struct _key_ctx);
534
535 if (likely(key_len <= left)) {
536 memcpy(key_ctx->key, sa_entry->key, key_len);
537 pos += key_len;
538 } else {
539 memcpy(pos, sa_entry->key, left);
540 memcpy(q->q.desc, sa_entry->key + left,
541 key_len - left);
542 pos = (u8 *)q->q.desc + (key_len - left);
543 }
544 /* Copy CPL TX PKT XT */
545 pos = copy_cpltx_pktxt(skb, dev, pos, sa_entry);
546
547 return pos;
548 }
549
ch_ipsec_crypto_wreq(struct sk_buff * skb,struct net_device * dev,void * pos,int credits,struct ipsec_sa_entry * sa_entry)550 static void *ch_ipsec_crypto_wreq(struct sk_buff *skb,
551 struct net_device *dev,
552 void *pos,
553 int credits,
554 struct ipsec_sa_entry *sa_entry)
555 {
556 struct port_info *pi = netdev_priv(dev);
557 struct adapter *adap = pi->adapter;
558 unsigned int ivsize = GCM_ESP_IV_SIZE;
559 struct chcr_ipsec_wr *wr;
560 bool immediate = false;
561 u16 immdatalen = 0;
562 unsigned int flits;
563 u32 ivinoffset;
564 u32 aadstart;
565 u32 aadstop;
566 u32 ciphstart;
567 u16 sc_more = 0;
568 u32 ivdrop = 0;
569 u32 esnlen = 0;
570 u32 wr_mid;
571 u16 ndesc;
572 int qidx = skb_get_queue_mapping(skb);
573 struct sge_eth_txq *q = &adap->sge.ethtxq[qidx + pi->first_qset];
574 unsigned int kctx_len = sa_entry->kctx_len;
575 int qid = q->q.cntxt_id;
576
577 atomic_inc(&adap->ch_ipsec_stats.ipsec_cnt);
578
579 flits = calc_tx_sec_flits(skb, sa_entry, &immediate);
580 ndesc = DIV_ROUND_UP(flits, 2);
581 if (sa_entry->esn)
582 ivdrop = 1;
583
584 if (immediate)
585 immdatalen = skb->len;
586
587 if (sa_entry->esn) {
588 esnlen = sizeof(struct chcr_ipsec_aadiv);
589 if (!skb_is_nonlinear(skb))
590 sc_more = 1;
591 }
592
593 /* WR Header */
594 wr = (struct chcr_ipsec_wr *)pos;
595 wr->wreq.op_to_compl = htonl(FW_WR_OP_V(FW_ULPTX_WR));
596 wr_mid = FW_CRYPTO_LOOKASIDE_WR_LEN16_V(ndesc);
597
598 if (unlikely(credits < ETHTXQ_STOP_THRES)) {
599 netif_tx_stop_queue(q->txq);
600 q->q.stops++;
601 if (!q->dbqt)
602 wr_mid |= FW_WR_EQUEQ_F | FW_WR_EQUIQ_F;
603 }
604 wr_mid |= FW_ULPTX_WR_DATA_F;
605 wr->wreq.flowid_len16 = htonl(wr_mid);
606
607 /* ULPTX */
608 wr->req.ulptx.cmd_dest = FILL_ULPTX_CMD_DEST(pi->port_id, qid);
609 wr->req.ulptx.len = htonl(ndesc - 1);
610
611 /* Sub-command */
612 wr->req.sc_imm.cmd_more = FILL_CMD_MORE(!immdatalen || sc_more);
613 wr->req.sc_imm.len = cpu_to_be32(sizeof(struct cpl_tx_sec_pdu) +
614 sizeof(wr->req.key_ctx) +
615 kctx_len +
616 sizeof(struct cpl_tx_pkt_core) +
617 esnlen +
618 (esnlen ? 0 : immdatalen));
619
620 /* CPL_SEC_PDU */
621 ivinoffset = sa_entry->esn ? (ESN_IV_INSERT_OFFSET + 1) :
622 (skb_transport_offset(skb) +
623 sizeof(struct ip_esp_hdr) + 1);
624 wr->req.sec_cpl.op_ivinsrtofst = htonl(
625 CPL_TX_SEC_PDU_OPCODE_V(CPL_TX_SEC_PDU) |
626 CPL_TX_SEC_PDU_CPLLEN_V(2) |
627 CPL_TX_SEC_PDU_PLACEHOLDER_V(1) |
628 CPL_TX_SEC_PDU_IVINSRTOFST_V(
629 ivinoffset));
630
631 wr->req.sec_cpl.pldlen = htonl(skb->len + esnlen);
632 aadstart = sa_entry->esn ? 1 : (skb_transport_offset(skb) + 1);
633 aadstop = sa_entry->esn ? ESN_IV_INSERT_OFFSET :
634 (skb_transport_offset(skb) +
635 sizeof(struct ip_esp_hdr));
636 ciphstart = skb_transport_offset(skb) + sizeof(struct ip_esp_hdr) +
637 GCM_ESP_IV_SIZE + 1;
638 ciphstart += sa_entry->esn ? esnlen : 0;
639
640 wr->req.sec_cpl.aadstart_cipherstop_hi = FILL_SEC_CPL_CIPHERSTOP_HI(
641 aadstart,
642 aadstop,
643 ciphstart, 0);
644
645 wr->req.sec_cpl.cipherstop_lo_authinsert =
646 FILL_SEC_CPL_AUTHINSERT(0, ciphstart,
647 sa_entry->authsize,
648 sa_entry->authsize);
649 wr->req.sec_cpl.seqno_numivs =
650 FILL_SEC_CPL_SCMD0_SEQNO(CHCR_ENCRYPT_OP, 1,
651 CHCR_SCMD_CIPHER_MODE_AES_GCM,
652 CHCR_SCMD_AUTH_MODE_GHASH,
653 sa_entry->hmac_ctrl,
654 ivsize >> 1);
655 wr->req.sec_cpl.ivgen_hdrlen = FILL_SEC_CPL_IVGEN_HDRLEN(0, 0, 1,
656 0, ivdrop, 0);
657
658 pos += sizeof(struct fw_ulptx_wr) +
659 sizeof(struct ulp_txpkt) +
660 sizeof(struct ulptx_idata) +
661 sizeof(struct cpl_tx_sec_pdu);
662
663 pos = copy_key_cpltx_pktxt(skb, dev, pos, sa_entry);
664
665 return pos;
666 }
667
668 /**
669 * flits_to_desc - returns the num of Tx descriptors for the given flits
670 * @n: the number of flits
671 *
672 * Returns the number of Tx descriptors needed for the supplied number
673 * of flits.
674 */
flits_to_desc(unsigned int n)675 static unsigned int flits_to_desc(unsigned int n)
676 {
677 WARN_ON(n > SGE_MAX_WR_LEN / 8);
678 return DIV_ROUND_UP(n, 8);
679 }
680
txq_avail(const struct sge_txq * q)681 static unsigned int txq_avail(const struct sge_txq *q)
682 {
683 return q->size - 1 - q->in_use;
684 }
685
eth_txq_stop(struct sge_eth_txq * q)686 static void eth_txq_stop(struct sge_eth_txq *q)
687 {
688 netif_tx_stop_queue(q->txq);
689 q->q.stops++;
690 }
691
txq_advance(struct sge_txq * q,unsigned int n)692 static void txq_advance(struct sge_txq *q, unsigned int n)
693 {
694 q->in_use += n;
695 q->pidx += n;
696 if (q->pidx >= q->size)
697 q->pidx -= q->size;
698 }
699
700 /*
701 * ch_ipsec_xmit called from ULD Tx handler
702 */
ch_ipsec_xmit(struct sk_buff * skb,struct net_device * dev)703 int ch_ipsec_xmit(struct sk_buff *skb, struct net_device *dev)
704 {
705 struct xfrm_state *x = xfrm_input_state(skb);
706 unsigned int last_desc, ndesc, flits = 0;
707 struct ipsec_sa_entry *sa_entry;
708 u64 *pos, *end, *before, *sgl;
709 struct tx_sw_desc *sgl_sdesc;
710 int qidx, left, credits;
711 bool immediate = false;
712 struct sge_eth_txq *q;
713 struct adapter *adap;
714 struct port_info *pi;
715 struct sec_path *sp;
716
717 if (!x->xso.offload_handle)
718 return NETDEV_TX_BUSY;
719
720 sa_entry = (struct ipsec_sa_entry *)x->xso.offload_handle;
721
722 sp = skb_sec_path(skb);
723 if (sp->len != 1) {
724 out_free: dev_kfree_skb_any(skb);
725 return NETDEV_TX_OK;
726 }
727
728 pi = netdev_priv(dev);
729 adap = pi->adapter;
730 qidx = skb->queue_mapping;
731 q = &adap->sge.ethtxq[qidx + pi->first_qset];
732
733 cxgb4_reclaim_completed_tx(adap, &q->q, true);
734
735 flits = calc_tx_sec_flits(skb, sa_entry, &immediate);
736 ndesc = flits_to_desc(flits);
737 credits = txq_avail(&q->q) - ndesc;
738
739 if (unlikely(credits < 0)) {
740 eth_txq_stop(q);
741 dev_err(adap->pdev_dev,
742 "%s: Tx ring %u full while queue awake! cred:%d %d %d flits:%d\n",
743 dev->name, qidx, credits, ndesc, txq_avail(&q->q),
744 flits);
745 return NETDEV_TX_BUSY;
746 }
747
748 last_desc = q->q.pidx + ndesc - 1;
749 if (last_desc >= q->q.size)
750 last_desc -= q->q.size;
751 sgl_sdesc = &q->q.sdesc[last_desc];
752
753 if (!immediate &&
754 unlikely(cxgb4_map_skb(adap->pdev_dev, skb, sgl_sdesc->addr) < 0)) {
755 memset(sgl_sdesc->addr, 0, sizeof(sgl_sdesc->addr));
756 q->mapping_err++;
757 goto out_free;
758 }
759
760 pos = (u64 *)&q->q.desc[q->q.pidx];
761 before = (u64 *)pos;
762 end = (u64 *)pos + flits;
763 /* Setup IPSec CPL */
764 pos = (void *)ch_ipsec_crypto_wreq(skb, dev, (void *)pos,
765 credits, sa_entry);
766 if (before > (u64 *)pos) {
767 left = (u8 *)end - (u8 *)q->q.stat;
768 end = (void *)q->q.desc + left;
769 }
770 if (pos == (u64 *)q->q.stat) {
771 left = (u8 *)end - (u8 *)q->q.stat;
772 end = (void *)q->q.desc + left;
773 pos = (void *)q->q.desc;
774 }
775
776 sgl = (void *)pos;
777 if (immediate) {
778 cxgb4_inline_tx_skb(skb, &q->q, sgl);
779 dev_consume_skb_any(skb);
780 } else {
781 cxgb4_write_sgl(skb, &q->q, (void *)sgl, end,
782 0, sgl_sdesc->addr);
783 skb_orphan(skb);
784 sgl_sdesc->skb = skb;
785 }
786 txq_advance(&q->q, ndesc);
787
788 cxgb4_ring_tx_db(adap, &q->q, ndesc);
789 return NETDEV_TX_OK;
790 }
791
ch_ipsec_init(void)792 static int __init ch_ipsec_init(void)
793 {
794 cxgb4_register_uld(CXGB4_ULD_IPSEC, &ch_ipsec_uld_info);
795
796 return 0;
797 }
798
ch_ipsec_exit(void)799 static void __exit ch_ipsec_exit(void)
800 {
801 struct ipsec_uld_ctx *u_ctx, *tmp;
802 struct adapter *adap;
803
804 mutex_lock(&dev_mutex);
805 list_for_each_entry_safe(u_ctx, tmp, &uld_ctx_list, entry) {
806 adap = pci_get_drvdata(u_ctx->lldi.pdev);
807 atomic_set(&adap->ch_ipsec_stats.ipsec_cnt, 0);
808 list_del(&u_ctx->entry);
809 kfree(u_ctx);
810 }
811 mutex_unlock(&dev_mutex);
812 cxgb4_unregister_uld(CXGB4_ULD_IPSEC);
813 }
814
815 module_init(ch_ipsec_init);
816 module_exit(ch_ipsec_exit);
817
818 MODULE_DESCRIPTION("Crypto IPSEC for Chelsio Terminator cards.");
819 MODULE_LICENSE("GPL");
820 MODULE_AUTHOR("Chelsio Communications");
821 MODULE_VERSION(CHIPSEC_DRV_VERSION);
822
823