blob: 0e81607018331a2fe0823463b05efa8a0357fd81 [file] [log] [blame]
/*
* This file is part of the Chelsio T6 Crypto driver for Linux.
*
* Copyright (c) 2003-2016 Chelsio Communications, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Written and Maintained by:
* Manoj Malviya (manojmalviya@chelsio.com)
* Atul Gupta (atul.gupta@chelsio.com)
* Jitendra Lulla (jlulla@chelsio.com)
* Yeshaswi M R Gowda (yeshaswi@chelsio.com)
* Harsh Jain (harsh@chelsio.com)
*/
#define pr_fmt(fmt) "chcr:" fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/cryptohash.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/highmem.h>
#include <linux/scatterlist.h>
#include <crypto/aes.h>
#include <crypto/algapi.h>
#include <crypto/hash.h>
#include <crypto/sha.h>
#include <crypto/authenc.h>
#include <crypto/ctr.h>
#include <crypto/gf128mul.h>
#include <crypto/internal/aead.h>
#include <crypto/null.h>
#include <crypto/internal/skcipher.h>
#include <crypto/aead.h>
#include <crypto/scatterwalk.h>
#include <crypto/internal/hash.h>
#include "t4fw_api.h"
#include "t4_msg.h"
#include "chcr_core.h"
#include "chcr_algo.h"
#include "chcr_crypto.h"
static inline struct chcr_aead_ctx *AEAD_CTX(struct chcr_context *ctx)
{
return ctx->crypto_ctx->aeadctx;
}
static inline struct ablk_ctx *ABLK_CTX(struct chcr_context *ctx)
{
return ctx->crypto_ctx->ablkctx;
}
static inline struct hmac_ctx *HMAC_CTX(struct chcr_context *ctx)
{
return ctx->crypto_ctx->hmacctx;
}
static inline struct chcr_gcm_ctx *GCM_CTX(struct chcr_aead_ctx *gctx)
{
return gctx->ctx->gcm;
}
static inline struct chcr_authenc_ctx *AUTHENC_CTX(struct chcr_aead_ctx *gctx)
{
return gctx->ctx->authenc;
}
static inline struct uld_ctx *ULD_CTX(struct chcr_context *ctx)
{
return ctx->dev->u_ctx;
}
static inline int is_ofld_imm(const struct sk_buff *skb)
{
return (skb->len <= CRYPTO_MAX_IMM_TX_PKT_LEN);
}
/*
* sgl_len - calculates the size of an SGL of the given capacity
* @n: the number of SGL entries
* Calculates the number of flits needed for a scatter/gather list that
* can hold the given number of entries.
*/
static inline unsigned int sgl_len(unsigned int n)
{
n--;
return (3 * n) / 2 + (n & 1) + 2;
}
static void chcr_verify_tag(struct aead_request *req, u8 *input, int *err)
{
u8 temp[SHA512_DIGEST_SIZE];
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
int authsize = crypto_aead_authsize(tfm);
struct cpl_fw6_pld *fw6_pld;
int cmp = 0;
fw6_pld = (struct cpl_fw6_pld *)input;
if ((get_aead_subtype(tfm) == CRYPTO_ALG_SUB_TYPE_AEAD_RFC4106) ||
(get_aead_subtype(tfm) == CRYPTO_ALG_SUB_TYPE_AEAD_GCM)) {
cmp = crypto_memneq(&fw6_pld->data[2], (fw6_pld + 1), authsize);
} else {
sg_pcopy_to_buffer(req->src, sg_nents(req->src), temp,
authsize, req->assoclen +
req->cryptlen - authsize);
cmp = crypto_memneq(temp, (fw6_pld + 1), authsize);
}
if (cmp)
*err = -EBADMSG;
else
*err = 0;
}
/*
* chcr_handle_resp - Unmap the DMA buffers associated with the request
* @req: crypto request
*/
int chcr_handle_resp(struct crypto_async_request *req, unsigned char *input,
int err)
{
struct crypto_tfm *tfm = req->tfm;
struct chcr_context *ctx = crypto_tfm_ctx(tfm);
struct uld_ctx *u_ctx = ULD_CTX(ctx);
struct chcr_req_ctx ctx_req;
unsigned int digestsize, updated_digestsize;
struct adapter *adap = padap(ctx->dev);
switch (tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
case CRYPTO_ALG_TYPE_AEAD:
ctx_req.req.aead_req = aead_request_cast(req);
ctx_req.ctx.reqctx = aead_request_ctx(ctx_req.req.aead_req);
dma_unmap_sg(&u_ctx->lldi.pdev->dev, ctx_req.ctx.reqctx->dst,
ctx_req.ctx.reqctx->dst_nents, DMA_FROM_DEVICE);
if (ctx_req.ctx.reqctx->skb) {
kfree_skb(ctx_req.ctx.reqctx->skb);
ctx_req.ctx.reqctx->skb = NULL;
}
free_new_sg(ctx_req.ctx.reqctx->newdstsg);
ctx_req.ctx.reqctx->newdstsg = NULL;
if (ctx_req.ctx.reqctx->verify == VERIFY_SW) {
chcr_verify_tag(ctx_req.req.aead_req, input,
&err);
ctx_req.ctx.reqctx->verify = VERIFY_HW;
}
ctx_req.req.aead_req->base.complete(req, err);
break;
case CRYPTO_ALG_TYPE_ABLKCIPHER:
err = chcr_handle_cipher_resp(ablkcipher_request_cast(req),
input, err);
break;
case CRYPTO_ALG_TYPE_AHASH:
ctx_req.req.ahash_req = ahash_request_cast(req);
ctx_req.ctx.ahash_ctx =
ahash_request_ctx(ctx_req.req.ahash_req);
digestsize =
crypto_ahash_digestsize(crypto_ahash_reqtfm(
ctx_req.req.ahash_req));
updated_digestsize = digestsize;
if (digestsize == SHA224_DIGEST_SIZE)
updated_digestsize = SHA256_DIGEST_SIZE;
else if (digestsize == SHA384_DIGEST_SIZE)
updated_digestsize = SHA512_DIGEST_SIZE;
if (ctx_req.ctx.ahash_ctx->skb) {
kfree_skb(ctx_req.ctx.ahash_ctx->skb);
ctx_req.ctx.ahash_ctx->skb = NULL;
}
if (ctx_req.ctx.ahash_ctx->result == 1) {
ctx_req.ctx.ahash_ctx->result = 0;
memcpy(ctx_req.req.ahash_req->result, input +
sizeof(struct cpl_fw6_pld),
digestsize);
} else {
memcpy(ctx_req.ctx.ahash_ctx->partial_hash, input +
sizeof(struct cpl_fw6_pld),
updated_digestsize);
}
ctx_req.req.ahash_req->base.complete(req, err);
break;
}
atomic_inc(&adap->chcr_stats.complete);
return err;
}
/*
* calc_tx_flits_ofld - calculate # of flits for an offload packet
* @skb: the packet
* Returns the number of flits needed for the given offload packet.
* These packets are already fully constructed and no additional headers
* will be added.
*/
static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
{
unsigned int flits, cnt;
if (is_ofld_imm(skb))
return DIV_ROUND_UP(skb->len, 8);
flits = skb_transport_offset(skb) / 8; /* headers */
cnt = skb_shinfo(skb)->nr_frags;
if (skb_tail_pointer(skb) != skb_transport_header(skb))
cnt++;
return flits + sgl_len(cnt);
}
static inline void get_aes_decrypt_key(unsigned char *dec_key,
const unsigned char *key,
unsigned int keylength)
{
u32 temp;
u32 w_ring[MAX_NK];
int i, j, k;
u8 nr, nk;
switch (keylength) {
case AES_KEYLENGTH_128BIT:
nk = KEYLENGTH_4BYTES;
nr = NUMBER_OF_ROUNDS_10;
break;
case AES_KEYLENGTH_192BIT:
nk = KEYLENGTH_6BYTES;
nr = NUMBER_OF_ROUNDS_12;
break;
case AES_KEYLENGTH_256BIT:
nk = KEYLENGTH_8BYTES;
nr = NUMBER_OF_ROUNDS_14;
break;
default:
return;
}
for (i = 0; i < nk; i++)
w_ring[i] = be32_to_cpu(*(u32 *)&key[4 * i]);
i = 0;
temp = w_ring[nk - 1];
while (i + nk < (nr + 1) * 4) {
if (!(i % nk)) {
/* RotWord(temp) */
temp = (temp << 8) | (temp >> 24);
temp = aes_ks_subword(temp);
temp ^= round_constant[i / nk];
} else if (nk == 8 && (i % 4 == 0)) {
temp = aes_ks_subword(temp);
}
w_ring[i % nk] ^= temp;
temp = w_ring[i % nk];
i++;
}
i--;
for (k = 0, j = i % nk; k < nk; k++) {
*((u32 *)dec_key + k) = htonl(w_ring[j]);
j--;
if (j < 0)
j += nk;
}
}
static struct crypto_shash *chcr_alloc_shash(unsigned int ds)
{
struct crypto_shash *base_hash = ERR_PTR(-EINVAL);
switch (ds) {
case SHA1_DIGEST_SIZE:
base_hash = crypto_alloc_shash("sha1", 0, 0);
break;
case SHA224_DIGEST_SIZE:
base_hash = crypto_alloc_shash("sha224", 0, 0);
break;
case SHA256_DIGEST_SIZE:
base_hash = crypto_alloc_shash("sha256", 0, 0);
break;
case SHA384_DIGEST_SIZE:
base_hash = crypto_alloc_shash("sha384", 0, 0);
break;
case SHA512_DIGEST_SIZE:
base_hash = crypto_alloc_shash("sha512", 0, 0);
break;
}
return base_hash;
}
static int chcr_compute_partial_hash(struct shash_desc *desc,
char *iopad, char *result_hash,
int digest_size)
{
struct sha1_state sha1_st;
struct sha256_state sha256_st;
struct sha512_state sha512_st;
int error;
if (digest_size == SHA1_DIGEST_SIZE) {
error = crypto_shash_init(desc) ?:
crypto_shash_update(desc, iopad, SHA1_BLOCK_SIZE) ?:
crypto_shash_export(desc, (void *)&sha1_st);
memcpy(result_hash, sha1_st.state, SHA1_DIGEST_SIZE);
} else if (digest_size == SHA224_DIGEST_SIZE) {
error = crypto_shash_init(desc) ?:
crypto_shash_update(desc, iopad, SHA256_BLOCK_SIZE) ?:
crypto_shash_export(desc, (void *)&sha256_st);
memcpy(result_hash, sha256_st.state, SHA256_DIGEST_SIZE);
} else if (digest_size == SHA256_DIGEST_SIZE) {
error = crypto_shash_init(desc) ?:
crypto_shash_update(desc, iopad, SHA256_BLOCK_SIZE) ?:
crypto_shash_export(desc, (void *)&sha256_st);
memcpy(result_hash, sha256_st.state, SHA256_DIGEST_SIZE);
} else if (digest_size == SHA384_DIGEST_SIZE) {
error = crypto_shash_init(desc) ?:
crypto_shash_update(desc, iopad, SHA512_BLOCK_SIZE) ?:
crypto_shash_export(desc, (void *)&sha512_st);
memcpy(result_hash, sha512_st.state, SHA512_DIGEST_SIZE);
} else if (digest_size == SHA512_DIGEST_SIZE) {
error = crypto_shash_init(desc) ?:
crypto_shash_update(desc, iopad, SHA512_BLOCK_SIZE) ?:
crypto_shash_export(desc, (void *)&sha512_st);
memcpy(result_hash, sha512_st.state, SHA512_DIGEST_SIZE);
} else {
error = -EINVAL;
pr_err("Unknown digest size %d\n", digest_size);
}
return error;
}
static void chcr_change_order(char *buf, int ds)
{
int i;
if (ds == SHA512_DIGEST_SIZE) {
for (i = 0; i < (ds / sizeof(u64)); i++)
*((__be64 *)buf + i) =
cpu_to_be64(*((u64 *)buf + i));
} else {
for (i = 0; i < (ds / sizeof(u32)); i++)
*((__be32 *)buf + i) =
cpu_to_be32(*((u32 *)buf + i));
}
}
static inline int is_hmac(struct crypto_tfm *tfm)
{
struct crypto_alg *alg = tfm->__crt_alg;
struct chcr_alg_template *chcr_crypto_alg =
container_of(__crypto_ahash_alg(alg), struct chcr_alg_template,
alg.hash);
if (chcr_crypto_alg->type == CRYPTO_ALG_TYPE_HMAC)
return 1;
return 0;
}
static void write_phys_cpl(struct cpl_rx_phys_dsgl *phys_cpl,
struct scatterlist *sg,
struct phys_sge_parm *sg_param)
{
struct phys_sge_pairs *to;
unsigned int len = 0, left_size = sg_param->obsize;
unsigned int nents = sg_param->nents, i, j = 0;
phys_cpl->op_to_tid = htonl(CPL_RX_PHYS_DSGL_OPCODE_V(CPL_RX_PHYS_DSGL)
| CPL_RX_PHYS_DSGL_ISRDMA_V(0));
phys_cpl->pcirlxorder_to_noofsgentr =
htonl(CPL_RX_PHYS_DSGL_PCIRLXORDER_V(0) |
CPL_RX_PHYS_DSGL_PCINOSNOOP_V(0) |
CPL_RX_PHYS_DSGL_PCITPHNTENB_V(0) |
CPL_RX_PHYS_DSGL_PCITPHNT_V(0) |
CPL_RX_PHYS_DSGL_DCAID_V(0) |
CPL_RX_PHYS_DSGL_NOOFSGENTR_V(nents));
phys_cpl->rss_hdr_int.opcode = CPL_RX_PHYS_ADDR;
phys_cpl->rss_hdr_int.qid = htons(sg_param->qid);
phys_cpl->rss_hdr_int.hash_val = 0;
to = (struct phys_sge_pairs *)((unsigned char *)phys_cpl +
sizeof(struct cpl_rx_phys_dsgl));
for (i = 0; nents && left_size; to++) {
for (j = 0; j < 8 && nents && left_size; j++, nents--) {
len = min(left_size, sg_dma_len(sg));
to->len[j] = htons(len);
to->addr[j] = cpu_to_be64(sg_dma_address(sg));
left_size -= len;
sg = sg_next(sg);
}
}
}
static inline int map_writesg_phys_cpl(struct device *dev,
struct cpl_rx_phys_dsgl *phys_cpl,
struct scatterlist *sg,
struct phys_sge_parm *sg_param)
{
if (!sg || !sg_param->nents)
return -EINVAL;
sg_param->nents = dma_map_sg(dev, sg, sg_param->nents, DMA_FROM_DEVICE);
if (sg_param->nents == 0) {
pr_err("CHCR : DMA mapping failed\n");
return -EINVAL;
}
write_phys_cpl(phys_cpl, sg, sg_param);
return 0;
}
static inline int get_aead_subtype(struct crypto_aead *aead)
{
struct aead_alg *alg = crypto_aead_alg(aead);
struct chcr_alg_template *chcr_crypto_alg =
container_of(alg, struct chcr_alg_template, alg.aead);
return chcr_crypto_alg->type & CRYPTO_ALG_SUB_TYPE_MASK;
}
static inline int get_cryptoalg_subtype(struct crypto_tfm *tfm)
{
struct crypto_alg *alg = tfm->__crt_alg;
struct chcr_alg_template *chcr_crypto_alg =
container_of(alg, struct chcr_alg_template, alg.crypto);
return chcr_crypto_alg->type & CRYPTO_ALG_SUB_TYPE_MASK;
}
static inline void write_buffer_to_skb(struct sk_buff *skb,
unsigned int *frags,
char *bfr,
u8 bfr_len)
{
skb->len += bfr_len;
skb->data_len += bfr_len;
skb->truesize += bfr_len;
get_page(virt_to_page(bfr));
skb_fill_page_desc(skb, *frags, virt_to_page(bfr),
offset_in_page(bfr), bfr_len);
(*frags)++;
}
static inline void
write_sg_to_skb(struct sk_buff *skb, unsigned int *frags,
struct scatterlist *sg, unsigned int count)
{
struct page *spage;
unsigned int page_len;
skb->len += count;
skb->data_len += count;
skb->truesize += count;
while (count > 0) {
if (!sg || (!(sg->length)))
break;
spage = sg_page(sg);
get_page(spage);
page_len = min(sg->length, count);
skb_fill_page_desc(skb, *frags, spage, sg->offset, page_len);
(*frags)++;
count -= page_len;
sg = sg_next(sg);
}
}
static int cxgb4_is_crypto_q_full(struct net_device *dev, unsigned int idx)
{
struct adapter *adap = netdev2adap(dev);
struct sge_uld_txq_info *txq_info =
adap->sge.uld_txq_info[CXGB4_TX_CRYPTO];
struct sge_uld_txq *txq;
int ret = 0;
local_bh_disable();
txq = &txq_info->uldtxq[idx];
spin_lock(&txq->sendq.lock);
if (txq->full)
ret = -1;
spin_unlock(&txq->sendq.lock);
local_bh_enable();
return ret;
}
static int generate_copy_rrkey(struct ablk_ctx *ablkctx,
struct _key_ctx *key_ctx)
{
if (ablkctx->ciph_mode == CHCR_SCMD_CIPHER_MODE_AES_CBC) {
memcpy(key_ctx->key, ablkctx->rrkey, ablkctx->enckey_len);
} else {
memcpy(key_ctx->key,
ablkctx->key + (ablkctx->enckey_len >> 1),
ablkctx->enckey_len >> 1);
memcpy(key_ctx->key + (ablkctx->enckey_len >> 1),
ablkctx->rrkey, ablkctx->enckey_len >> 1);
}
return 0;
}
static int chcr_sg_ent_in_wr(struct scatterlist *src,
struct scatterlist *dst,
unsigned int minsg,
unsigned int space,
short int *sent,
short int *dent)
{
int srclen = 0, dstlen = 0;
int srcsg = minsg, dstsg = 0;
*sent = 0;
*dent = 0;
while (src && dst && ((srcsg + 1) <= MAX_SKB_FRAGS) &&
space > (sgl_ent_len[srcsg + 1] + dsgl_ent_len[dstsg])) {
srclen += src->length;
srcsg++;
while (dst && ((dstsg + 1) <= MAX_DSGL_ENT) &&
space > (sgl_ent_len[srcsg] + dsgl_ent_len[dstsg + 1])) {
if (srclen <= dstlen)
break;
dstlen += dst->length;
dst = sg_next(dst);
dstsg++;
}
src = sg_next(src);
}
*sent = srcsg - minsg;
*dent = dstsg;
return min(srclen, dstlen);
}
static int chcr_cipher_fallback(struct crypto_skcipher *cipher,
u32 flags,
struct scatterlist *src,
struct scatterlist *dst,
unsigned int nbytes,
u8 *iv,
unsigned short op_type)
{
int err;
SKCIPHER_REQUEST_ON_STACK(subreq, cipher);
skcipher_request_set_tfm(subreq, cipher);
skcipher_request_set_callback(subreq, flags, NULL, NULL);
skcipher_request_set_crypt(subreq, src, dst,
nbytes, iv);
err = op_type ? crypto_skcipher_decrypt(subreq) :
crypto_skcipher_encrypt(subreq);
skcipher_request_zero(subreq);
return err;
}
static inline void create_wreq(struct chcr_context *ctx,
struct chcr_wr *chcr_req,
void *req, struct sk_buff *skb,
int kctx_len, int hash_sz,
int is_iv,
unsigned int sc_len,
unsigned int lcb)
{
struct uld_ctx *u_ctx = ULD_CTX(ctx);
int iv_loc = IV_DSGL;
int qid = u_ctx->lldi.rxq_ids[ctx->rx_qidx];
unsigned int immdatalen = 0, nr_frags = 0;
if (is_ofld_imm(skb)) {
immdatalen = skb->data_len;
iv_loc = IV_IMMEDIATE;
} else {
nr_frags = skb_shinfo(skb)->nr_frags;
}
chcr_req->wreq.op_to_cctx_size = FILL_WR_OP_CCTX_SIZE(immdatalen,
((sizeof(chcr_req->key_ctx) + kctx_len) >> 4));
chcr_req->wreq.pld_size_hash_size =
htonl(FW_CRYPTO_LOOKASIDE_WR_PLD_SIZE_V(sgl_lengths[nr_frags]) |
FW_CRYPTO_LOOKASIDE_WR_HASH_SIZE_V(hash_sz));
chcr_req->wreq.len16_pkd =
htonl(FW_CRYPTO_LOOKASIDE_WR_LEN16_V(DIV_ROUND_UP(
(calc_tx_flits_ofld(skb) * 8), 16)));
chcr_req->wreq.cookie = cpu_to_be64((uintptr_t)req);
chcr_req->wreq.rx_chid_to_rx_q_id =
FILL_WR_RX_Q_ID(ctx->dev->rx_channel_id, qid,
is_iv ? iv_loc : IV_NOP, !!lcb,
ctx->tx_qidx);
chcr_req->ulptx.cmd_dest = FILL_ULPTX_CMD_DEST(ctx->dev->tx_channel_id,
qid);
chcr_req->ulptx.len = htonl((DIV_ROUND_UP((calc_tx_flits_ofld(skb) * 8),
16) - ((sizeof(chcr_req->wreq)) >> 4)));
chcr_req->sc_imm.cmd_more = FILL_CMD_MORE(immdatalen);
chcr_req->sc_imm.len = cpu_to_be32(sizeof(struct cpl_tx_sec_pdu) +
sizeof(chcr_req->key_ctx) +
kctx_len + sc_len + immdatalen);
}
/**
* create_cipher_wr - form the WR for cipher operations
* @req: cipher req.
* @ctx: crypto driver context of the request.
* @qid: ingress qid where response of this WR should be received.
* @op_type: encryption or decryption
*/
static struct sk_buff *create_cipher_wr(struct cipher_wr_param *wrparam)
{
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(wrparam->req);
struct chcr_context *ctx = crypto_ablkcipher_ctx(tfm);
struct uld_ctx *u_ctx = ULD_CTX(ctx);
struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
struct sk_buff *skb = NULL;
struct chcr_wr *chcr_req;
struct cpl_rx_phys_dsgl *phys_cpl;
struct chcr_blkcipher_req_ctx *reqctx =
ablkcipher_request_ctx(wrparam->req);
struct phys_sge_parm sg_param;
unsigned int frags = 0, transhdr_len, phys_dsgl;
int error;
unsigned int ivsize = AES_BLOCK_SIZE, kctx_len;
gfp_t flags = wrparam->req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
GFP_KERNEL : GFP_ATOMIC;
struct adapter *adap = padap(ctx->dev);
phys_dsgl = get_space_for_phys_dsgl(reqctx->dst_nents);
kctx_len = (DIV_ROUND_UP(ablkctx->enckey_len, 16) * 16);
transhdr_len = CIPHER_TRANSHDR_SIZE(kctx_len, phys_dsgl);
skb = alloc_skb((transhdr_len + sizeof(struct sge_opaque_hdr)), flags);
if (!skb) {
error = -ENOMEM;
goto err;
}
skb_reserve(skb, sizeof(struct sge_opaque_hdr));
chcr_req = __skb_put_zero(skb, transhdr_len);
chcr_req->sec_cpl.op_ivinsrtofst =
FILL_SEC_CPL_OP_IVINSR(ctx->dev->rx_channel_id, 2, 1);
chcr_req->sec_cpl.pldlen = htonl(ivsize + wrparam->bytes);
chcr_req->sec_cpl.aadstart_cipherstop_hi =
FILL_SEC_CPL_CIPHERSTOP_HI(0, 0, ivsize + 1, 0);
chcr_req->sec_cpl.cipherstop_lo_authinsert =
FILL_SEC_CPL_AUTHINSERT(0, 0, 0, 0);
chcr_req->sec_cpl.seqno_numivs = FILL_SEC_CPL_SCMD0_SEQNO(reqctx->op, 0,
ablkctx->ciph_mode,
0, 0, ivsize >> 1);
chcr_req->sec_cpl.ivgen_hdrlen = FILL_SEC_CPL_IVGEN_HDRLEN(0, 0, 0,
0, 1, phys_dsgl);
chcr_req->key_ctx.ctx_hdr = ablkctx->key_ctx_hdr;
if ((reqctx->op == CHCR_DECRYPT_OP) &&
(!(get_cryptoalg_subtype(crypto_ablkcipher_tfm(tfm)) ==
CRYPTO_ALG_SUB_TYPE_CTR)) &&
(!(get_cryptoalg_subtype(crypto_ablkcipher_tfm(tfm)) ==
CRYPTO_ALG_SUB_TYPE_CTR_RFC3686))) {
generate_copy_rrkey(ablkctx, &chcr_req->key_ctx);
} else {
if ((ablkctx->ciph_mode == CHCR_SCMD_CIPHER_MODE_AES_CBC) ||
(ablkctx->ciph_mode == CHCR_SCMD_CIPHER_MODE_AES_CTR)) {
memcpy(chcr_req->key_ctx.key, ablkctx->key,
ablkctx->enckey_len);
} else {
memcpy(chcr_req->key_ctx.key, ablkctx->key +
(ablkctx->enckey_len >> 1),
ablkctx->enckey_len >> 1);
memcpy(chcr_req->key_ctx.key +
(ablkctx->enckey_len >> 1),
ablkctx->key,
ablkctx->enckey_len >> 1);
}
}
phys_cpl = (struct cpl_rx_phys_dsgl *)((u8 *)(chcr_req + 1) + kctx_len);
sg_param.nents = reqctx->dst_nents;
sg_param.obsize = wrparam->bytes;
sg_param.qid = wrparam->qid;
error = map_writesg_phys_cpl(&u_ctx->lldi.pdev->dev, phys_cpl,
reqctx->dst, &sg_param);
if (error)
goto map_fail1;
skb_set_transport_header(skb, transhdr_len);
write_buffer_to_skb(skb, &frags, reqctx->iv, ivsize);
write_sg_to_skb(skb, &frags, wrparam->srcsg, wrparam->bytes);
atomic_inc(&adap->chcr_stats.cipher_rqst);
create_wreq(ctx, chcr_req, &(wrparam->req->base), skb, kctx_len, 0, 1,
sizeof(struct cpl_rx_phys_dsgl) + phys_dsgl,
ablkctx->ciph_mode == CHCR_SCMD_CIPHER_MODE_AES_CBC);
reqctx->skb = skb;
skb_get(skb);
return skb;
map_fail1:
kfree_skb(skb);
err:
return ERR_PTR(error);
}
static inline int chcr_keyctx_ck_size(unsigned int keylen)
{
int ck_size = 0;
if (keylen == AES_KEYSIZE_128)
ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_128;
else if (keylen == AES_KEYSIZE_192)
ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_192;
else if (keylen == AES_KEYSIZE_256)
ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_256;
else
ck_size = 0;
return ck_size;
}
static int chcr_cipher_fallback_setkey(struct crypto_ablkcipher *cipher,
const u8 *key,
unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
struct chcr_context *ctx = crypto_ablkcipher_ctx(cipher);
struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
int err = 0;
crypto_skcipher_clear_flags(ablkctx->sw_cipher, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(ablkctx->sw_cipher, cipher->base.crt_flags &
CRYPTO_TFM_REQ_MASK);
err = crypto_skcipher_setkey(ablkctx->sw_cipher, key, keylen);
tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
tfm->crt_flags |=
crypto_skcipher_get_flags(ablkctx->sw_cipher) &
CRYPTO_TFM_RES_MASK;
return err;
}
static int chcr_aes_cbc_setkey(struct crypto_ablkcipher *cipher,
const u8 *key,
unsigned int keylen)
{
struct chcr_context *ctx = crypto_ablkcipher_ctx(cipher);
struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
unsigned int ck_size, context_size;
u16 alignment = 0;
int err;
err = chcr_cipher_fallback_setkey(cipher, key, keylen);
if (err)
goto badkey_err;
ck_size = chcr_keyctx_ck_size(keylen);
alignment = ck_size == CHCR_KEYCTX_CIPHER_KEY_SIZE_192 ? 8 : 0;
memcpy(ablkctx->key, key, keylen);
ablkctx->enckey_len = keylen;
get_aes_decrypt_key(ablkctx->rrkey, ablkctx->key, keylen << 3);
context_size = (KEY_CONTEXT_HDR_SALT_AND_PAD +
keylen + alignment) >> 4;
ablkctx->key_ctx_hdr = FILL_KEY_CTX_HDR(ck_size, CHCR_KEYCTX_NO_KEY,
0, 0, context_size);
ablkctx->ciph_mode = CHCR_SCMD_CIPHER_MODE_AES_CBC;
return 0;
badkey_err:
crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
ablkctx->enckey_len = 0;
return err;
}
static int chcr_aes_ctr_setkey(struct crypto_ablkcipher *cipher,
const u8 *key,
unsigned int keylen)
{
struct chcr_context *ctx = crypto_ablkcipher_ctx(cipher);
struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
unsigned int ck_size, context_size;
u16 alignment = 0;
int err;
err = chcr_cipher_fallback_setkey(cipher, key, keylen);
if (err)
goto badkey_err;
ck_size = chcr_keyctx_ck_size(keylen);
alignment = (ck_size == CHCR_KEYCTX_CIPHER_KEY_SIZE_192) ? 8 : 0;
memcpy(ablkctx->key, key, keylen);
ablkctx->enckey_len = keylen;
context_size = (KEY_CONTEXT_HDR_SALT_AND_PAD +
keylen + alignment) >> 4;
ablkctx->key_ctx_hdr = FILL_KEY_CTX_HDR(ck_size, CHCR_KEYCTX_NO_KEY,
0, 0, context_size);
ablkctx->ciph_mode = CHCR_SCMD_CIPHER_MODE_AES_CTR;
return 0;
badkey_err:
crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
ablkctx->enckey_len = 0;
return err;
}
static int chcr_aes_rfc3686_setkey(struct crypto_ablkcipher *cipher,
const u8 *key,
unsigned int keylen)
{
struct chcr_context *ctx = crypto_ablkcipher_ctx(cipher);
struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
unsigned int ck_size, context_size;
u16 alignment = 0;
int err;
if (keylen < CTR_RFC3686_NONCE_SIZE)
return -EINVAL;
memcpy(ablkctx->nonce, key + (keylen - CTR_RFC3686_NONCE_SIZE),
CTR_RFC3686_NONCE_SIZE);
keylen -= CTR_RFC3686_NONCE_SIZE;
err = chcr_cipher_fallback_setkey(cipher, key, keylen);
if (err)
goto badkey_err;
ck_size = chcr_keyctx_ck_size(keylen);
alignment = (ck_size == CHCR_KEYCTX_CIPHER_KEY_SIZE_192) ? 8 : 0;
memcpy(ablkctx->key, key, keylen);
ablkctx->enckey_len = keylen;
context_size = (KEY_CONTEXT_HDR_SALT_AND_PAD +
keylen + alignment) >> 4;
ablkctx->key_ctx_hdr = FILL_KEY_CTX_HDR(ck_size, CHCR_KEYCTX_NO_KEY,
0, 0, context_size);
ablkctx->ciph_mode = CHCR_SCMD_CIPHER_MODE_AES_CTR;
return 0;
badkey_err:
crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
ablkctx->enckey_len = 0;
return err;
}
static void ctr_add_iv(u8 *dstiv, u8 *srciv, u32 add)
{
unsigned int size = AES_BLOCK_SIZE;
__be32 *b = (__be32 *)(dstiv + size);
u32 c, prev;
memcpy(dstiv, srciv, AES_BLOCK_SIZE);
for (; size >= 4; size -= 4) {
prev = be32_to_cpu(*--b);
c = prev + add;
*b = cpu_to_be32(c);
if (prev < c)
break;
add = 1;
}
}
static unsigned int adjust_ctr_overflow(u8 *iv, u32 bytes)
{
__be32 *b = (__be32 *)(iv + AES_BLOCK_SIZE);
u64 c;
u32 temp = be32_to_cpu(*--b);
temp = ~temp;
c = (u64)temp + 1; // No of block can processed withou overflow
if ((bytes / AES_BLOCK_SIZE) > c)
bytes = c * AES_BLOCK_SIZE;
return bytes;
}
static int chcr_update_tweak(struct ablkcipher_request *req, u8 *iv)
{
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
struct chcr_context *ctx = crypto_ablkcipher_ctx(tfm);
struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
struct chcr_blkcipher_req_ctx *reqctx = ablkcipher_request_ctx(req);
struct crypto_cipher *cipher;
int ret, i;
u8 *key;
unsigned int keylen;
cipher = ablkctx->aes_generic;
memcpy(iv, req->info, AES_BLOCK_SIZE);
keylen = ablkctx->enckey_len / 2;
key = ablkctx->key + keylen;
ret = crypto_cipher_setkey(cipher, key, keylen);
if (ret)
goto out;
crypto_cipher_encrypt_one(cipher, iv, iv);
for (i = 0; i < (reqctx->processed / AES_BLOCK_SIZE); i++)
gf128mul_x_ble((le128 *)iv, (le128 *)iv);
crypto_cipher_decrypt_one(cipher, iv, iv);
out:
return ret;
}
static int chcr_update_cipher_iv(struct ablkcipher_request *req,
struct cpl_fw6_pld *fw6_pld, u8 *iv)
{
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
struct chcr_blkcipher_req_ctx *reqctx = ablkcipher_request_ctx(req);
int subtype = get_cryptoalg_subtype(crypto_ablkcipher_tfm(tfm));
int ret = 0;
if (subtype == CRYPTO_ALG_SUB_TYPE_CTR)
ctr_add_iv(iv, req->info, (reqctx->processed /
AES_BLOCK_SIZE));
else if (subtype == CRYPTO_ALG_SUB_TYPE_CTR_RFC3686)
*(__be32 *)(reqctx->iv + CTR_RFC3686_NONCE_SIZE +
CTR_RFC3686_IV_SIZE) = cpu_to_be32((reqctx->processed /
AES_BLOCK_SIZE) + 1);
else if (subtype == CRYPTO_ALG_SUB_TYPE_XTS)
ret = chcr_update_tweak(req, iv);
else if (subtype == CRYPTO_ALG_SUB_TYPE_CBC) {
if (reqctx->op)
sg_pcopy_to_buffer(req->src, sg_nents(req->src), iv,
16,
reqctx->processed - AES_BLOCK_SIZE);
else
memcpy(iv, &fw6_pld->data[2], AES_BLOCK_SIZE);
}
return ret;
}
/* We need separate function for final iv because in rfc3686 Initial counter
* starts from 1 and buffer size of iv is 8 byte only which remains constant
* for subsequent update requests
*/
static int chcr_final_cipher_iv(struct ablkcipher_request *req,
struct cpl_fw6_pld *fw6_pld, u8 *iv)
{
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
struct chcr_blkcipher_req_ctx *reqctx = ablkcipher_request_ctx(req);
int subtype = get_cryptoalg_subtype(crypto_ablkcipher_tfm(tfm));
int ret = 0;
if (subtype == CRYPTO_ALG_SUB_TYPE_CTR)
ctr_add_iv(iv, req->info, (reqctx->processed /
AES_BLOCK_SIZE));
else if (subtype == CRYPTO_ALG_SUB_TYPE_XTS)
ret = chcr_update_tweak(req, iv);
else if (subtype == CRYPTO_ALG_SUB_TYPE_CBC) {
if (reqctx->op)
sg_pcopy_to_buffer(req->src, sg_nents(req->src), iv,
16,
reqctx->processed - AES_BLOCK_SIZE);
else
memcpy(iv, &fw6_pld->data[2], AES_BLOCK_SIZE);
}
return ret;
}
static int chcr_handle_cipher_resp(struct ablkcipher_request *req,
unsigned char *input, int err)
{
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
struct chcr_context *ctx = crypto_ablkcipher_ctx(tfm);
struct uld_ctx *u_ctx = ULD_CTX(ctx);
struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
struct sk_buff *skb;
struct cpl_fw6_pld *fw6_pld = (struct cpl_fw6_pld *)input;
struct chcr_blkcipher_req_ctx *reqctx = ablkcipher_request_ctx(req);
struct cipher_wr_param wrparam;
int bytes;
dma_unmap_sg(&u_ctx->lldi.pdev->dev, reqctx->dst, reqctx->dst_nents,
DMA_FROM_DEVICE);
if (reqctx->skb) {
kfree_skb(reqctx->skb);
reqctx->skb = NULL;
}
if (err)
goto complete;
if (req->nbytes == reqctx->processed) {
err = chcr_final_cipher_iv(req, fw6_pld, req->info);
goto complete;
}
if (unlikely(cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
ctx->tx_qidx))) {
if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
err = -EBUSY;
goto complete;
}
}
wrparam.srcsg = scatterwalk_ffwd(reqctx->srcffwd, req->src,
reqctx->processed);
reqctx->dst = scatterwalk_ffwd(reqctx->dstffwd, reqctx->dstsg,
reqctx->processed);
if (!wrparam.srcsg || !reqctx->dst) {
pr_err("Input sg list length less that nbytes\n");
err = -EINVAL;
goto complete;
}
bytes = chcr_sg_ent_in_wr(wrparam.srcsg, reqctx->dst, 1,
SPACE_LEFT(ablkctx->enckey_len),
&wrparam.snent, &reqctx->dst_nents);
if ((bytes + reqctx->processed) >= req->nbytes)
bytes = req->nbytes - reqctx->processed;
else
bytes = ROUND_16(bytes);
err = chcr_update_cipher_iv(req, fw6_pld, reqctx->iv);
if (err)
goto complete;
if (unlikely(bytes == 0)) {
err = chcr_cipher_fallback(ablkctx->sw_cipher,
req->base.flags,
wrparam.srcsg,
reqctx->dst,
req->nbytes - reqctx->processed,
reqctx->iv,
reqctx->op);
goto complete;
}
if (get_cryptoalg_subtype(crypto_ablkcipher_tfm(tfm)) ==
CRYPTO_ALG_SUB_TYPE_CTR)
bytes = adjust_ctr_overflow(reqctx->iv, bytes);
reqctx->processed += bytes;
wrparam.qid = u_ctx->lldi.rxq_ids[ctx->rx_qidx];
wrparam.req = req;
wrparam.bytes = bytes;
skb = create_cipher_wr(&wrparam);
if (IS_ERR(skb)) {
pr_err("chcr : %s : Failed to form WR. No memory\n", __func__);
err = PTR_ERR(skb);
goto complete;
}
skb->dev = u_ctx->lldi.ports[0];
set_wr_txq(skb, CPL_PRIORITY_DATA, ctx->tx_qidx);
chcr_send_wr(skb);
return 0;
complete:
free_new_sg(reqctx->newdstsg);
reqctx->newdstsg = NULL;
req->base.complete(&req->base, err);
return err;
}
static int process_cipher(struct ablkcipher_request *req,
unsigned short qid,
struct sk_buff **skb,
unsigned short op_type)
{
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
unsigned int ivsize = crypto_ablkcipher_ivsize(tfm);
struct chcr_blkcipher_req_ctx *reqctx = ablkcipher_request_ctx(req);
struct chcr_context *ctx = crypto_ablkcipher_ctx(tfm);
struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
struct cipher_wr_param wrparam;
int bytes, nents, err = -EINVAL;
reqctx->newdstsg = NULL;
reqctx->processed = 0;
if (!req->info)
goto error;
if ((ablkctx->enckey_len == 0) || (ivsize > AES_BLOCK_SIZE) ||
(req->nbytes == 0) ||
(req->nbytes % crypto_ablkcipher_blocksize(tfm))) {
pr_err("AES: Invalid value of Key Len %d nbytes %d IV Len %d\n",
ablkctx->enckey_len, req->nbytes, ivsize);
goto error;
}
wrparam.srcsg = req->src;
if (is_newsg(req->dst, &nents)) {
reqctx->newdstsg = alloc_new_sg(req->dst, nents);
if (IS_ERR(reqctx->newdstsg))
return PTR_ERR(reqctx->newdstsg);
reqctx->dstsg = reqctx->newdstsg;
} else {
reqctx->dstsg = req->dst;
}
bytes = chcr_sg_ent_in_wr(wrparam.srcsg, reqctx->dstsg, MIN_CIPHER_SG,
SPACE_LEFT(ablkctx->enckey_len),
&wrparam.snent,
&reqctx->dst_nents);
if ((bytes + reqctx->processed) >= req->nbytes)
bytes = req->nbytes - reqctx->processed;
else
bytes = ROUND_16(bytes);
if (unlikely(bytes > req->nbytes))
bytes = req->nbytes;
if (get_cryptoalg_subtype(crypto_ablkcipher_tfm(tfm)) ==
CRYPTO_ALG_SUB_TYPE_CTR) {
bytes = adjust_ctr_overflow(req->info, bytes);
}
if (get_cryptoalg_subtype(crypto_ablkcipher_tfm(tfm)) ==
CRYPTO_ALG_SUB_TYPE_CTR_RFC3686) {
memcpy(reqctx->iv, ablkctx->nonce, CTR_RFC3686_NONCE_SIZE);
memcpy(reqctx->iv + CTR_RFC3686_NONCE_SIZE, req->info,
CTR_RFC3686_IV_SIZE);
/* initialize counter portion of counter block */
*(__be32 *)(reqctx->iv + CTR_RFC3686_NONCE_SIZE +
CTR_RFC3686_IV_SIZE) = cpu_to_be32(1);
} else {
memcpy(reqctx->iv, req->info, ivsize);
}
if (unlikely(bytes == 0)) {
err = chcr_cipher_fallback(ablkctx->sw_cipher,
req->base.flags,
req->src,
req->dst,
req->nbytes,
req->info,
op_type);
goto error;
}
reqctx->processed = bytes;
reqctx->dst = reqctx->dstsg;
reqctx->op = op_type;
wrparam.qid = qid;
wrparam.req = req;
wrparam.bytes = bytes;
*skb = create_cipher_wr(&wrparam);
if (IS_ERR(*skb)) {
err = PTR_ERR(*skb);
goto error;
}
return 0;
error:
free_new_sg(reqctx->newdstsg);
reqctx->newdstsg = NULL;
return err;
}
static int chcr_aes_encrypt(struct ablkcipher_request *req)
{
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
struct chcr_context *ctx = crypto_ablkcipher_ctx(tfm);
struct sk_buff *skb = NULL;
int err;
struct uld_ctx *u_ctx = ULD_CTX(ctx);
if (unlikely(cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
ctx->tx_qidx))) {
if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
return -EBUSY;
}
err = process_cipher(req, u_ctx->lldi.rxq_ids[ctx->rx_qidx], &skb,
CHCR_ENCRYPT_OP);
if (err || !skb)
return err;
skb->dev = u_ctx->lldi.ports[0];
set_wr_txq(skb, CPL_PRIORITY_DATA, ctx->tx_qidx);
chcr_send_wr(skb);
return -EINPROGRESS;
}
static int chcr_aes_decrypt(struct ablkcipher_request *req)
{
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
struct chcr_context *ctx = crypto_ablkcipher_ctx(tfm);
struct uld_ctx *u_ctx = ULD_CTX(ctx);
struct sk_buff *skb = NULL;
int err;
if (unlikely(cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
ctx->tx_qidx))) {
if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
return -EBUSY;
}
err = process_cipher(req, u_ctx->lldi.rxq_ids[ctx->rx_qidx], &skb,
CHCR_DECRYPT_OP);
if (err || !skb)
return err;
skb->dev = u_ctx->lldi.ports[0];
set_wr_txq(skb, CPL_PRIORITY_DATA, ctx->tx_qidx);
chcr_send_wr(skb);
return -EINPROGRESS;
}
static int chcr_device_init(struct chcr_context *ctx)
{
struct uld_ctx *u_ctx = NULL;
struct adapter *adap;
unsigned int id;
int txq_perchan, txq_idx, ntxq;
int err = 0, rxq_perchan, rxq_idx;
id = smp_processor_id();
if (!ctx->dev) {
u_ctx = assign_chcr_device();
if (!u_ctx) {
pr_err("chcr device assignment fails\n");
goto out;
}
ctx->dev = u_ctx->dev;
adap = padap(ctx->dev);
ntxq = min_not_zero((unsigned int)u_ctx->lldi.nrxq,
adap->vres.ncrypto_fc);
rxq_perchan = u_ctx->lldi.nrxq / u_ctx->lldi.nchan;
txq_perchan = ntxq / u_ctx->lldi.nchan;
rxq_idx = ctx->dev->tx_channel_id * rxq_perchan;
rxq_idx += id % rxq_perchan;
txq_idx = ctx->dev->tx_channel_id * txq_perchan;
txq_idx += id % txq_perchan;
spin_lock(&ctx->dev->lock_chcr_dev);
ctx->rx_qidx = rxq_idx;
ctx->tx_qidx = txq_idx;
ctx->dev->tx_channel_id = !ctx->dev->tx_channel_id;
ctx->dev->rx_channel_id = 0;
spin_unlock(&ctx->dev->lock_chcr_dev);
}
out:
return err;
}
static int chcr_cra_init(struct crypto_tfm *tfm)
{
struct crypto_alg *alg = tfm->__crt_alg;
struct chcr_context *ctx = crypto_tfm_ctx(tfm);
struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
ablkctx->sw_cipher = crypto_alloc_skcipher(alg->cra_name, 0,
CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(ablkctx->sw_cipher)) {
pr_err("failed to allocate fallback for %s\n", alg->cra_name);
return PTR_ERR(ablkctx->sw_cipher);
}
if (get_cryptoalg_subtype(tfm) == CRYPTO_ALG_SUB_TYPE_XTS) {
/* To update tweak*/
ablkctx->aes_generic = crypto_alloc_cipher("aes-generic", 0, 0);
if (IS_ERR(ablkctx->aes_generic)) {
pr_err("failed to allocate aes cipher for tweak\n");
return PTR_ERR(ablkctx->aes_generic);
}
} else
ablkctx->aes_generic = NULL;
tfm->crt_ablkcipher.reqsize = sizeof(struct chcr_blkcipher_req_ctx);
return chcr_device_init(crypto_tfm_ctx(tfm));
}
static int chcr_rfc3686_init(struct crypto_tfm *tfm)
{
struct crypto_alg *alg = tfm->__crt_alg;
struct chcr_context *ctx = crypto_tfm_ctx(tfm);
struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
/*RFC3686 initialises IV counter value to 1, rfc3686(ctr(aes))
* cannot be used as fallback in chcr_handle_cipher_response
*/
ablkctx->sw_cipher = crypto_alloc_skcipher("ctr(aes)", 0,
CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(ablkctx->sw_cipher)) {
pr_err("failed to allocate fallback for %s\n", alg->cra_name);
return PTR_ERR(ablkctx->sw_cipher);
}
tfm->crt_ablkcipher.reqsize = sizeof(struct chcr_blkcipher_req_ctx);
return chcr_device_init(crypto_tfm_ctx(tfm));
}
static void chcr_cra_exit(struct crypto_tfm *tfm)
{
struct chcr_context *ctx = crypto_tfm_ctx(tfm);
struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
crypto_free_skcipher(ablkctx->sw_cipher);
if (ablkctx->aes_generic)
crypto_free_cipher(ablkctx->aes_generic);
}
static int get_alg_config(struct algo_param *params,
unsigned int auth_size)
{
switch (auth_size) {
case SHA1_DIGEST_SIZE:
params->mk_size = CHCR_KEYCTX_MAC_KEY_SIZE_160;
params->auth_mode = CHCR_SCMD_AUTH_MODE_SHA1;
params->result_size = SHA1_DIGEST_SIZE;
break;
case SHA224_DIGEST_SIZE:
params->mk_size = CHCR_KEYCTX_MAC_KEY_SIZE_256;
params->auth_mode = CHCR_SCMD_AUTH_MODE_SHA224;
params->result_size = SHA256_DIGEST_SIZE;
break;
case SHA256_DIGEST_SIZE:
params->mk_size = CHCR_KEYCTX_MAC_KEY_SIZE_256;
params->auth_mode = CHCR_SCMD_AUTH_MODE_SHA256;
params->result_size = SHA256_DIGEST_SIZE;
break;
case SHA384_DIGEST_SIZE:
params->mk_size = CHCR_KEYCTX_MAC_KEY_SIZE_512;
params->auth_mode = CHCR_SCMD_AUTH_MODE_SHA512_384;
params->result_size = SHA512_DIGEST_SIZE;
break;
case SHA512_DIGEST_SIZE:
params->mk_size = CHCR_KEYCTX_MAC_KEY_SIZE_512;
params->auth_mode = CHCR_SCMD_AUTH_MODE_SHA512_512;
params->result_size = SHA512_DIGEST_SIZE;
break;
default:
pr_err("chcr : ERROR, unsupported digest size\n");
return -EINVAL;
}
return 0;
}
static inline void chcr_free_shash(struct crypto_shash *base_hash)
{
crypto_free_shash(base_hash);
}
/**
* create_hash_wr - Create hash work request
* @req - Cipher req base
*/
static struct sk_buff *create_hash_wr(struct ahash_request *req,
struct hash_wr_param *param)
{
struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct chcr_context *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
struct hmac_ctx *hmacctx = HMAC_CTX(ctx);
struct sk_buff *skb = NULL;
struct chcr_wr *chcr_req;
unsigned int frags = 0, transhdr_len, iopad_alignment = 0;
unsigned int digestsize = crypto_ahash_digestsize(tfm);
unsigned int kctx_len = 0;
u8 hash_size_in_response = 0;
gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
GFP_ATOMIC;
struct adapter *adap = padap(ctx->dev);
iopad_alignment = KEYCTX_ALIGN_PAD(digestsize);
kctx_len = param->alg_prm.result_size + iopad_alignment;
if (param->opad_needed)
kctx_len += param->alg_prm.result_size + iopad_alignment;
if (req_ctx->result)
hash_size_in_response = digestsize;
else
hash_size_in_response = param->alg_prm.result_size;
transhdr_len = HASH_TRANSHDR_SIZE(kctx_len);
skb = alloc_skb((transhdr_len + sizeof(struct sge_opaque_hdr)), flags);
if (!skb)
return skb;
skb_reserve(skb, sizeof(struct sge_opaque_hdr));
chcr_req = __skb_put_zero(skb, transhdr_len);
chcr_req->sec_cpl.op_ivinsrtofst =
FILL_SEC_CPL_OP_IVINSR(ctx->dev->rx_channel_id, 2, 0);
chcr_req->sec_cpl.pldlen = htonl(param->bfr_len + param->sg_len);
chcr_req->sec_cpl.aadstart_cipherstop_hi =
FILL_SEC_CPL_CIPHERSTOP_HI(0, 0, 0, 0);
chcr_req->sec_cpl.cipherstop_lo_authinsert =
FILL_SEC_CPL_AUTHINSERT(0, 1, 0, 0);
chcr_req->sec_cpl.seqno_numivs =
FILL_SEC_CPL_SCMD0_SEQNO(0, 0, 0, param->alg_prm.auth_mode,
param->opad_needed, 0);
chcr_req->sec_cpl.ivgen_hdrlen =
FILL_SEC_CPL_IVGEN_HDRLEN(param->last, param->more, 0, 1, 0, 0);
memcpy(chcr_req->key_ctx.key, req_ctx->partial_hash,
param->alg_prm.result_size);
if (param->opad_needed)
memcpy(chcr_req->key_ctx.key +
((param->alg_prm.result_size <= 32) ? 32 :
CHCR_HASH_MAX_DIGEST_SIZE),
hmacctx->opad, param->alg_prm.result_size);
chcr_req->key_ctx.ctx_hdr = FILL_KEY_CTX_HDR(CHCR_KEYCTX_NO_KEY,
param->alg_prm.mk_size, 0,
param->opad_needed,
((kctx_len +
sizeof(chcr_req->key_ctx)) >> 4));
chcr_req->sec_cpl.scmd1 = cpu_to_be64((u64)param->scmd1);
skb_set_transport_header(skb, transhdr_len);
if (param->bfr_len != 0)
write_buffer_to_skb(skb, &frags, req_ctx->reqbfr,
param->bfr_len);
if (param->sg_len != 0)
write_sg_to_skb(skb, &frags, req->src, param->sg_len);
atomic_inc(&adap->chcr_stats.digest_rqst);
create_wreq(ctx, chcr_req, &req->base, skb, kctx_len,
hash_size_in_response, 0, DUMMY_BYTES, 0);
req_ctx->skb = skb;
skb_get(skb);
return skb;
}
static int chcr_ahash_update(struct ahash_request *req)
{
struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
struct crypto_ahash *rtfm = crypto_ahash_reqtfm(req);
struct chcr_context *ctx = crypto_tfm_ctx(crypto_ahash_tfm(rtfm));
struct uld_ctx *u_ctx = NULL;
struct sk_buff *skb;
u8 remainder = 0, bs;
unsigned int nbytes = req->nbytes;
struct hash_wr_param params;
bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(rtfm));
u_ctx = ULD_CTX(ctx);
if (unlikely(cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
ctx->tx_qidx))) {
if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
return -EBUSY;
}
if (nbytes + req_ctx->reqlen >= bs) {
remainder = (nbytes + req_ctx->reqlen) % bs;
nbytes = nbytes + req_ctx->reqlen - remainder;
} else {
sg_pcopy_to_buffer(req->src, sg_nents(req->src), req_ctx->reqbfr
+ req_ctx->reqlen, nbytes, 0);
req_ctx->reqlen += nbytes;
return 0;
}
params.opad_needed = 0;
params.more = 1;
params.last = 0;
params.sg_len = nbytes - req_ctx->reqlen;
params.bfr_len = req_ctx->reqlen;
params.scmd1 = 0;
get_alg_config(&params.alg_prm, crypto_ahash_digestsize(rtfm));
req_ctx->result = 0;
req_ctx->data_len += params.sg_len + params.bfr_len;
skb = create_hash_wr(req, &params);
if (!skb)
return -ENOMEM;
if (remainder) {
u8 *temp;
/* Swap buffers */
temp = req_ctx->reqbfr;
req_ctx->reqbfr = req_ctx->skbfr;
req_ctx->skbfr = temp;
sg_pcopy_to_buffer(req->src, sg_nents(req->src),
req_ctx->reqbfr, remainder, req->nbytes -
remainder);
}
req_ctx->reqlen = remainder;
skb->dev = u_ctx->lldi.ports[0];
set_wr_txq(skb, CPL_PRIORITY_DATA, ctx->tx_qidx);
chcr_send_wr(skb);
return -EINPROGRESS;
}
static void create_last_hash_block(char *bfr_ptr, unsigned int bs, u64 scmd1)
{
memset(bfr_ptr, 0, bs);
*bfr_ptr = 0x80;
if (bs == 64)
*(__be64 *)(bfr_ptr + 56) = cpu_to_be64(scmd1 << 3);
else
*(__be64 *)(bfr_ptr + 120) = cpu_to_be64(scmd1 << 3);
}
static int chcr_ahash_final(struct ahash_request *req)
{
struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
struct crypto_ahash *rtfm = crypto_ahash_reqtfm(req);
struct chcr_context *ctx = crypto_tfm_ctx(crypto_ahash_tfm(rtfm));
struct hash_wr_param params;
struct sk_buff *skb;
struct uld_ctx *u_ctx = NULL;
u8 bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(rtfm));
u_ctx = ULD_CTX(ctx);
if (is_hmac(crypto_ahash_tfm(rtfm)))
params.opad_needed = 1;
else
params.opad_needed = 0;
params.sg_len = 0;
get_alg_config(&params.alg_prm, crypto_ahash_digestsize(rtfm));
req_ctx->result = 1;
params.bfr_len = req_ctx->reqlen;
req_ctx->data_len += params.bfr_len + params.sg_len;
if (req_ctx->reqlen == 0) {
create_last_hash_block(req_ctx->reqbfr, bs, req_ctx->data_len);
params.last = 0;
params.more = 1;
params.scmd1 = 0;
params.bfr_len = bs;
} else {
params.scmd1 = req_ctx->data_len;
params.last = 1;
params.more = 0;
}
skb = create_hash_wr(req, &params);
if (!skb)
return -ENOMEM;
skb->dev = u_ctx->lldi.ports[0];
set_wr_txq(skb, CPL_PRIORITY_DATA, ctx->tx_qidx);
chcr_send_wr(skb);
return -EINPROGRESS;
}
static int chcr_ahash_finup(struct ahash_request *req)
{
struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
struct crypto_ahash *rtfm = crypto_ahash_reqtfm(req);
struct chcr_context *ctx = crypto_tfm_ctx(crypto_ahash_tfm(rtfm));
struct uld_ctx *u_ctx = NULL;
struct sk_buff *skb;
struct hash_wr_param params;
u8 bs;
bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(rtfm));
u_ctx = ULD_CTX(ctx);
if (unlikely(cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
ctx->tx_qidx))) {
if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
return -EBUSY;
}
if (is_hmac(crypto_ahash_tfm(rtfm)))
params.opad_needed = 1;
else
params.opad_needed = 0;
params.sg_len = req->nbytes;
params.bfr_len = req_ctx->reqlen;
get_alg_config(&params.alg_prm, crypto_ahash_digestsize(rtfm));
req_ctx->data_len += params.bfr_len + params.sg_len;
req_ctx->result = 1;
if ((req_ctx->reqlen + req->nbytes) == 0) {
create_last_hash_block(req_ctx->reqbfr, bs, req_ctx->data_len);
params.last = 0;
params.more = 1;
params.scmd1 = 0;
params.bfr_len = bs;
} else {
params.scmd1 = req_ctx->data_len;
params.last = 1;
params.more = 0;
}
skb = create_hash_wr(req, &params);
if (!skb)
return -ENOMEM;
skb->dev = u_ctx->lldi.ports[0];
set_wr_txq(skb, CPL_PRIORITY_DATA, ctx->tx_qidx);
chcr_send_wr(skb);
return -EINPROGRESS;
}
static int chcr_ahash_digest(struct ahash_request *req)
{
struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
struct crypto_ahash *rtfm = crypto_ahash_reqtfm(req);
struct chcr_context *ctx = crypto_tfm_ctx(crypto_ahash_tfm(rtfm));
struct uld_ctx *u_ctx = NULL;
struct sk_buff *skb;
struct hash_wr_param params;
u8 bs;
rtfm->init(req);
bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(rtfm));
u_ctx = ULD_CTX(ctx);
if (unlikely(cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
ctx->tx_qidx))) {
if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
return -EBUSY;
}
if (is_hmac(crypto_ahash_tfm(rtfm)))
params.opad_needed = 1;
else
params.opad_needed = 0;
params.last = 0;
params.more = 0;
params.sg_len = req->nbytes;
params.bfr_len = 0;
params.scmd1 = 0;
get_alg_config(&params.alg_prm, crypto_ahash_digestsize(rtfm));
req_ctx->result = 1;
req_ctx->data_len += params.bfr_len + params.sg_len;
if (req->nbytes == 0) {
create_last_hash_block(req_ctx->reqbfr, bs, 0);
params.more = 1;
params.bfr_len = bs;
}
skb = create_hash_wr(req, &params);
if (!skb)
return -ENOMEM;
skb->dev = u_ctx->lldi.ports[0];
set_wr_txq(skb, CPL_PRIORITY_DATA, ctx->tx_qidx);
chcr_send_wr(skb);
return -EINPROGRESS;
}
static int chcr_ahash_export(struct ahash_request *areq, void *out)
{
struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
struct chcr_ahash_req_ctx *state = out;
state->reqlen = req_ctx->reqlen;
state->data_len = req_ctx->data_len;
memcpy(state->bfr1, req_ctx->reqbfr, req_ctx->reqlen);
memcpy(state->partial_hash, req_ctx->partial_hash,
CHCR_HASH_MAX_DIGEST_SIZE);
return 0;
}
static int chcr_ahash_import(struct ahash_request *areq, const void *in)
{
struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
struct chcr_ahash_req_ctx *state = (struct chcr_ahash_req_ctx *)in;
req_ctx->reqlen = state->reqlen;
req_ctx->data_len = state->data_len;
req_ctx->reqbfr = req_ctx->bfr1;
req_ctx->skbfr = req_ctx->bfr2;
memcpy(req_ctx->bfr1, state->bfr1, CHCR_HASH_MAX_BLOCK_SIZE_128);
memcpy(req_ctx->partial_hash, state->partial_hash,
CHCR_HASH_MAX_DIGEST_SIZE);
return 0;
}
static int chcr_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
unsigned int keylen)
{
struct chcr_context *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
struct hmac_ctx *hmacctx = HMAC_CTX(ctx);
unsigned int digestsize = crypto_ahash_digestsize(tfm);
unsigned int bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
unsigned int i, err = 0, updated_digestsize;
SHASH_DESC_ON_STACK(shash, hmacctx->base_hash);
/* use the key to calculate the ipad and opad. ipad will sent with the
* first request's data. opad will be sent with the final hash result
* ipad in hmacctx->ipad and opad in hmacctx->opad location
*/
shash->tfm = hmacctx->base_hash;
shash->flags = crypto_shash_get_flags(hmacctx->base_hash);
if (keylen > bs) {
err = crypto_shash_digest(shash, key, keylen,
hmacctx->ipad);
if (err)
goto out;
keylen = digestsize;
} else {
memcpy(hmacctx->ipad, key, keylen);
}
memset(hmacctx->ipad + keylen, 0, bs - keylen);
memcpy(hmacctx->opad, hmacctx->ipad, bs);
for (i = 0; i < bs / sizeof(int); i++) {
*((unsigned int *)(&hmacctx->ipad) + i) ^= IPAD_DATA;
*((unsigned int *)(&hmacctx->opad) + i) ^= OPAD_DATA;
}
updated_digestsize = digestsize;
if (digestsize == SHA224_DIGEST_SIZE)
updated_digestsize = SHA256_DIGEST_SIZE;
else if (digestsize == SHA384_DIGEST_SIZE)
updated_digestsize = SHA512_DIGEST_SIZE;
err = chcr_compute_partial_hash(shash, hmacctx->ipad,
hmacctx->ipad, digestsize);
if (err)
goto out;
chcr_change_order(hmacctx->ipad, updated_digestsize);
err = chcr_compute_partial_hash(shash, hmacctx->opad,
hmacctx->opad, digestsize);
if (err)
goto out;
chcr_change_order(hmacctx->opad, updated_digestsize);
out:
return err;
}
static int chcr_aes_xts_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
unsigned int key_len)
{
struct chcr_context *ctx = crypto_ablkcipher_ctx(cipher);
struct ablk_ctx *ablkctx = ABLK_CTX(ctx);
unsigned short context_size = 0;
int err;
err = chcr_cipher_fallback_setkey(cipher, key, key_len);
if (err)
goto badkey_err;
memcpy(ablkctx->key, key, key_len);
ablkctx->enckey_len = key_len;
get_aes_decrypt_key(ablkctx->rrkey, ablkctx->key, key_len << 2);
context_size = (KEY_CONTEXT_HDR_SALT_AND_PAD + key_len) >> 4;
ablkctx->key_ctx_hdr =
FILL_KEY_CTX_HDR((key_len == AES_KEYSIZE_256) ?
CHCR_KEYCTX_CIPHER_KEY_SIZE_128 :
CHCR_KEYCTX_CIPHER_KEY_SIZE_256,
CHCR_KEYCTX_NO_KEY, 1,
0, context_size);
ablkctx->ciph_mode = CHCR_SCMD_CIPHER_MODE_AES_XTS;
return 0;
badkey_err:
crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
ablkctx->enckey_len = 0;
return err;
}
static int chcr_sha_init(struct ahash_request *areq)
{
struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
int digestsize = crypto_ahash_digestsize(tfm);
req_ctx->data_len = 0;
req_ctx->reqlen = 0;
req_ctx->reqbfr = req_ctx->bfr1;
req_ctx->skbfr = req_ctx->bfr2;
req_ctx->skb = NULL;
req_ctx->result = 0;
copy_hash_init_values(req_ctx->partial_hash, digestsize);
return 0;
}
static int chcr_sha_cra_init(struct crypto_tfm *tfm)
{
crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
sizeof(struct chcr_ahash_req_ctx));
return chcr_device_init(crypto_tfm_ctx(tfm));
}
static int chcr_hmac_init(struct ahash_request *areq)
{
struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
struct crypto_ahash *rtfm = crypto_ahash_reqtfm(areq);
struct chcr_context *ctx = crypto_tfm_ctx(crypto_ahash_tfm(rtfm));
struct hmac_ctx *hmacctx = HMAC_CTX(ctx);
unsigned int digestsize = crypto_ahash_digestsize(rtfm);
unsigned int bs = crypto_tfm_alg_blocksize(crypto_ahash_tfm(rtfm));
chcr_sha_init(areq);
req_ctx->data_len = bs;
if (is_hmac(crypto_ahash_tfm(rtfm))) {
if (digestsize == SHA224_DIGEST_SIZE)
memcpy(req_ctx->partial_hash, hmacctx->ipad,
SHA256_DIGEST_SIZE);
else if (digestsize == SHA384_DIGEST_SIZE)
memcpy(req_ctx->partial_hash, hmacctx->ipad,
SHA512_DIGEST_SIZE);
else
memcpy(req_ctx->partial_hash, hmacctx->ipad,
digestsize);
}
return 0;
}
static int chcr_hmac_cra_init(struct crypto_tfm *tfm)
{
struct chcr_context *ctx = crypto_tfm_ctx(tfm);
struct hmac_ctx *hmacctx = HMAC_CTX(ctx);
unsigned int digestsize =
crypto_ahash_digestsize(__crypto_ahash_cast(tfm));
crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
sizeof(struct chcr_ahash_req_ctx));
hmacctx->base_hash = chcr_alloc_shash(digestsize);
if (IS_ERR(hmacctx->base_hash))
return PTR_ERR(hmacctx->base_hash);
return chcr_device_init(crypto_tfm_ctx(tfm));
}
static void chcr_hmac_cra_exit(struct crypto_tfm *tfm)
{
struct chcr_context *ctx = crypto_tfm_ctx(tfm);
struct hmac_ctx *hmacctx = HMAC_CTX(ctx);
if (hmacctx->base_hash) {
chcr_free_shash(hmacctx->base_hash);
hmacctx->base_hash = NULL;
}
}
static int is_newsg(struct scatterlist *sgl, unsigned int *newents)
{
int nents = 0;
int ret = 0;
while (sgl) {
if (sgl->length > CHCR_SG_SIZE)
ret = 1;
nents += DIV_ROUND_UP(sgl->length, CHCR_SG_SIZE);
sgl = sg_next(sgl);
}
*newents = nents;
return ret;
}
static inline void free_new_sg(struct scatterlist *sgl)
{
kfree(sgl);
}
static struct scatterlist *alloc_new_sg(struct scatterlist *sgl,
unsigned int nents)
{
struct scatterlist *newsg, *sg;
int i, len, processed = 0;
struct page *spage;
int offset;
newsg = kmalloc_array(nents, sizeof(struct scatterlist), GFP_KERNEL);
if (!newsg)
return ERR_PTR(-ENOMEM);
sg = newsg;
sg_init_table(sg, nents);
offset = sgl->offset;
spage = sg_page(sgl);
for (i = 0; i < nents; i++) {
len = min_t(u32, sgl->length - processed, CHCR_SG_SIZE);
sg_set_page(sg, spage, len, offset);
processed += len;
offset += len;
if (offset >= PAGE_SIZE) {
offset = offset % PAGE_SIZE;
spage++;
}
if (processed == sgl->length) {
processed = 0;
sgl = sg_next(sgl);
if (!sgl)
break;
spage = sg_page(sgl);
offset = sgl->offset;
}
sg = sg_next(sg);
}
return newsg;
}
static int chcr_copy_assoc(struct aead_request *req,
struct chcr_aead_ctx *ctx)
{
SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
skcipher_request_set_tfm(skreq, ctx->null);
skcipher_request_set_callback(skreq, aead_request_flags(req),
NULL, NULL);
skcipher_request_set_crypt(skreq, req->src, req->dst, req->assoclen,
NULL);
return crypto_skcipher_encrypt(skreq);
}
static int chcr_aead_need_fallback(struct aead_request *req, int src_nent,
int aadmax, int wrlen,
unsigned short op_type)
{
unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
if (((req->cryptlen - (op_type ? authsize : 0)) == 0) ||
(req->assoclen > aadmax) ||
(src_nent > MAX_SKB_FRAGS) ||
(wrlen > MAX_WR_SIZE))
return 1;
return 0;
}
static int chcr_aead_fallback(struct aead_request *req, unsigned short op_type)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct chcr_context *ctx = crypto_aead_ctx(tfm);
struct chcr_aead_ctx *aeadctx = AEAD_CTX(ctx);
struct aead_request *subreq = aead_request_ctx(req);
aead_request_set_tfm(subreq, aeadctx->sw_cipher);
aead_request_set_callback(subreq, req->base.flags,
req->base.complete, req->base.data);
aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
req->iv);
aead_request_set_ad(subreq, req->assoclen);
return op_type ? crypto_aead_decrypt(subreq) :
crypto_aead_encrypt(subreq);
}
static struct sk_buff *create_authenc_wr(struct aead_request *req,
unsigned short qid,
int size,
unsigned short op_type)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct chcr_context *ctx = crypto_aead_ctx(tfm);
struct uld_ctx *u_ctx = ULD_CTX(ctx);
struct chcr_aead_ctx *aeadctx = AEAD_CTX(ctx);
struct chcr_authenc_ctx *actx = AUTHENC_CTX(aeadctx);
struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
struct sk_buff *skb = NULL;
struct chcr_wr *chcr_req;
struct cpl_rx_phys_dsgl *phys_cpl;
struct phys_sge_parm sg_param;
struct scatterlist *src;
unsigned int frags = 0, transhdr_len;
unsigned int ivsize = crypto_aead_ivsize(tfm), dst_size = 0;
unsigned int kctx_len = 0, nents;
unsigned short stop_offset = 0;
unsigned int assoclen = req->assoclen;
unsigned int authsize = crypto_aead_authsize(tfm);
int error = -EINVAL, src_nent;
int null = 0;
gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
GFP_ATOMIC;
struct adapter *adap = padap(ctx->dev);
reqctx->newdstsg = NULL;
dst_size = req->assoclen + req->cryptlen + (op_type ? -authsize :
authsize);
if (aeadctx->enckey_len == 0 || (req->cryptlen <= 0))
goto err;
if (op_type && req->cryptlen < crypto_aead_authsize(tfm))
goto err;
src_nent = sg_nents_for_len(req->src, req->assoclen + req->cryptlen);
if (src_nent < 0)
goto err;
src = scatterwalk_ffwd(reqctx->srcffwd, req->src, req->assoclen);
if (req->src != req->dst) {
error = chcr_copy_assoc(req, aeadctx);
if (error)
return ERR_PTR(error);
}
if (dst_size && is_newsg(req->dst, &nents)) {
reqctx->newdstsg = alloc_new_sg(req->dst, nents);
if (IS_ERR(reqctx->newdstsg))
return ERR_CAST(reqctx->newdstsg);
reqctx->dst = scatterwalk_ffwd(reqctx->dstffwd,
reqctx->newdstsg, req->assoclen);
} else {
if (req->src == req->dst)
reqctx->dst = src;
else
reqctx->dst = scatterwalk_ffwd(reqctx->dstffwd,
req->dst, req->assoclen);
}
if (get_aead_subtype(tfm) == CRYPTO_ALG_SUB_TYPE_AEAD_NULL) {
null = 1;
assoclen = 0;
}
reqctx->dst_nents = sg_nents_for_len(reqctx->dst, req->cryptlen +
(op_type ? -authsize : authsize));
if (reqctx->dst_nents < 0) {
pr_err("AUTHENC:Invalid Destination sg entries\n");
error = -EINVAL;
goto err;
}
dst_size = get_space_for_phys_dsgl(reqctx->dst_nents);
kctx_len = (ntohl(KEY_CONTEXT_CTX_LEN_V(aeadctx->key_ctx_hdr)) << 4)
- sizeof(chcr_req->key_ctx);
transhdr_len = CIPHER_TRANSHDR_SIZE(kctx_len, dst_size);
if (chcr_aead_need_fallback(req, src_nent + MIN_AUTH_SG,
T6_MAX_AAD_SIZE,
transhdr_len + (sgl_len(src_nent + MIN_AUTH_SG) * 8),
op_type)) {
atomic_inc(&adap->chcr_stats.fallback);
free_new_sg(reqctx->newdstsg);
reqctx->newdstsg = NULL;
return ERR_PTR(chcr_aead_fallback(req, op_type));
}
skb = alloc_skb((transhdr_len + sizeof(struct sge_opaque_hdr)), flags);
if (!skb) {
error = -ENOMEM;
goto err;
}
/* LLD is going to write the sge hdr. */
skb_reserve(skb, sizeof(struct sge_opaque_hdr));
/* Write WR */
chcr_req = __skb_put_zero(skb, transhdr_len);
stop_offset = (op_type == CHCR_ENCRYPT_OP) ? 0 : authsize;
/*
* Input order is AAD,IV and Payload. where IV should be included as
* the part of authdata. All other fields should be filled according
* to the hardware spec
*/
chcr_req->sec_cpl.op_ivinsrtofst =
FILL_SEC_CPL_OP_IVINSR(ctx->dev->rx_channel_id, 2,
(ivsize ? (assoclen + 1) : 0));
chcr_req->sec_cpl.pldlen = htonl(assoclen + ivsize + req->cryptlen);
chcr_req->sec_cpl.aadstart_cipherstop_hi = FILL_SEC_CPL_CIPHERSTOP_HI(
assoclen ? 1 : 0, assoclen,
assoclen + ivsize + 1,
(stop_offset & 0x1F0) >> 4);
chcr_req->sec_cpl.cipherstop_lo_authinsert = FILL_SEC_CPL_AUTHINSERT(
stop_offset & 0xF,
null ? 0 : assoclen + ivsize + 1,
stop_offset, stop_offset);
chcr_req->sec_cpl.seqno_numivs = FILL_SEC_CPL_SCMD0_SEQNO(op_type,
(op_type == CHCR_ENCRYPT_OP) ? 1 : 0,
CHCR_SCMD_CIPHER_MODE_AES_CBC,
actx->auth_mode, aeadctx->hmac_ctrl,
ivsize >> 1);
chcr_req->sec_cpl.ivgen_hdrlen = FILL_SEC_CPL_IVGEN_HDRLEN(0, 0, 1,
0, 1, dst_size);
chcr_req->key_ctx.ctx_hdr = aeadctx->key_ctx_hdr;
if (op_type == CHCR_ENCRYPT_OP)
memcpy(chcr_req->key_ctx.key, aeadctx->key,
aeadctx->enckey_len);
else
memcpy(chcr_req->key_ctx.key, actx->dec_rrkey,
aeadctx->enckey_len);
memcpy(chcr_req->key_ctx.key + (DIV_ROUND_UP(aeadctx->enckey_len, 16) <<
4), actx->h_iopad, kctx_len -
(DIV_ROUND_UP(aeadctx->enckey_len, 16) << 4));
phys_cpl = (struct cpl_rx_phys_dsgl *)((u8 *)(chcr_req + 1) + kctx_len);
sg_param.nents = reqctx->dst_nents;
sg_param.obsize = req->cryptlen + (op_type ? -authsize : authsize);
sg_param.qid = qid;
error = map_writesg_phys_cpl(&u_ctx->lldi.pdev->dev, phys_cpl,
reqctx->dst, &sg_param);
if (error)
goto dstmap_fail;
skb_set_transport_header(skb, transhdr_len);
if (assoclen) {
/* AAD buffer in */
write_sg_to_skb(skb, &frags, req->src, assoclen);
}
write_buffer_to_skb(skb, &frags, req->iv, ivsize);
write_sg_to_skb(skb, &frags, src, req->cryptlen);
atomic_inc(&adap->chcr_stats.cipher_rqst);
create_wreq(ctx, chcr_req, &req->base, skb, kctx_len, size, 1,
sizeof(struct cpl_rx_phys_dsgl) + dst_size, 0);
reqctx->skb = skb;
skb_get(skb);
return skb;
dstmap_fail:
/* ivmap_fail: */
kfree_skb(skb);
err:
free_new_sg(reqctx->newdstsg);
reqctx->newdstsg = NULL;
return ERR_PTR(error);
}
static int set_msg_len(u8 *block, unsigned int msglen, int csize)
{
__be32 data;
memset(block, 0, csize);
block += csize;
if (csize >= 4)
csize = 4;
else if (msglen > (unsigned int)(1 << (8 * csize)))
return -EOVERFLOW;
data = cpu_to_be32(msglen);
memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
return 0;
}
static void generate_b0(struct aead_request *req,
struct chcr_aead_ctx *aeadctx,
unsigned short op_type)
{
unsigned int l, lp, m;
int rc;
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
u8 *b0 = reqctx->scratch_pad;
m = crypto_aead_authsize(aead);
memcpy(b0, reqctx->iv, 16);
lp = b0[0];
l = lp + 1;
/* set m, bits 3-5 */
*b0 |= (8 * ((m - 2) / 2));
/* set adata, bit 6, if associated data is used */
if (req->assoclen)
*b0 |= 64;
rc = set_msg_len(b0 + 16 - l,
(op_type == CHCR_DECRYPT_OP) ?
req->cryptlen - m : req->cryptlen, l);
}
static inline int crypto_ccm_check_iv(const u8 *iv)
{
/* 2 <= L <= 8, so 1 <= L' <= 7. */
if (iv[0] < 1 || iv[0] > 7)
return -EINVAL;
return 0;
}
static int ccm_format_packet(struct aead_request *req,
struct chcr_aead_ctx *aeadctx,
unsigned int sub_type,
unsigned short op_type)
{
struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
int rc = 0;
if (sub_type == CRYPTO_ALG_SUB_TYPE_AEAD_RFC4309) {
reqctx->iv[0] = 3;
memcpy(reqctx->iv + 1, &aeadctx->salt[0], 3);
memcpy(reqctx->iv + 4, req->iv, 8);
memset(reqctx->iv + 12, 0, 4);
*((unsigned short *)(reqctx->scratch_pad + 16)) =
htons(req->assoclen - 8);
} else {
memcpy(reqctx->iv, req->iv, 16);
*((unsigned short *)(reqctx->scratch_pad + 16)) =
htons(req->assoclen);
}
generate_b0(req, aeadctx, op_type);
/* zero the ctr value */
memset(reqctx->iv + 15 - reqctx->iv[0], 0, reqctx->iv[0] + 1);
return rc;
}
static void fill_sec_cpl_for_aead(struct cpl_tx_sec_pdu *sec_cpl,
unsigned int dst_size,
struct aead_request *req,
unsigned short op_type,
struct chcr_context *chcrctx)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct chcr_aead_ctx *aeadctx = AEAD_CTX(crypto_aead_ctx(tfm));
unsigned int ivsize = AES_BLOCK_SIZE;
unsigned int cipher_mode = CHCR_SCMD_CIPHER_MODE_AES_CCM;
unsigned int mac_mode = CHCR_SCMD_AUTH_MODE_CBCMAC;
unsigned int c_id = chcrctx->dev->rx_channel_id;
unsigned int ccm_xtra;
unsigned char tag_offset = 0, auth_offset = 0;
unsigned int assoclen;
if (get_aead_subtype(tfm) == CRYPTO_ALG_SUB_TYPE_AEAD_RFC4309)
assoclen = req->assoclen - 8;
else
assoclen = req->assoclen;
ccm_xtra = CCM_B0_SIZE +
((assoclen) ? CCM_AAD_FIELD_SIZE : 0);
auth_offset = req->cryptlen ?
(assoclen + ivsize + 1 + ccm_xtra) : 0;
if (op_type == CHCR_DECRYPT_OP) {
if (crypto_aead_authsize(tfm) != req->cryptlen)
tag_offset = crypto_aead_authsize(tfm);
else
auth_offset = 0;
}
sec_cpl->op_ivinsrtofst = FILL_SEC_CPL_OP_IVINSR(c_id,
2, (ivsize ? (assoclen + 1) : 0) +
ccm_xtra);
sec_cpl->pldlen =
htonl(assoclen + ivsize + req->cryptlen + ccm_xtra);
/* For CCM there wil be b0 always. So AAD start will be 1 always */
sec_cpl->aadstart_cipherstop_hi = FILL_SEC_CPL_CIPHERSTOP_HI(
1, assoclen + ccm_xtra, assoclen
+ ivsize + 1 + ccm_xtra, 0);
sec_cpl->cipherstop_lo_authinsert = FILL_SEC_CPL_AUTHINSERT(0,
auth_offset, tag_offset,
(op_type == CHCR_ENCRYPT_OP) ? 0 :
crypto_aead_authsize(tfm));
sec_cpl->seqno_numivs = FILL_SEC_CPL_SCMD0_SEQNO(op_type,
(op_type == CHCR_ENCRYPT_OP) ? 0 : 1,
cipher_mode, mac_mode,
aeadctx->hmac_ctrl, ivsize >> 1);
sec_cpl->ivgen_hdrlen = FILL_SEC_CPL_IVGEN_HDRLEN(0, 0, 1, 0,
1, dst_size);
}
int aead_ccm_validate_input(unsigned short op_type,
struct aead_request *req,
struct chcr_aead_ctx *aeadctx,
unsigned int sub_type)
{
if (sub_type != CRYPTO_ALG_SUB_TYPE_AEAD_RFC4309) {
if (crypto_ccm_check_iv(req->iv)) {
pr_err("CCM: IV check fails\n");
return -EINVAL;
}
} else {
if (req->assoclen != 16 && req->assoclen != 20) {
pr_err("RFC4309: Invalid AAD length %d\n",
req->assoclen);
return -EINVAL;
}
}
if (aeadctx->enckey_len == 0) {
pr_err("CCM: Encryption key not set\n");
return -EINVAL;
}
return 0;
}
unsigned int fill_aead_req_fields(struct sk_buff *skb,
struct aead_request *req,
struct scatterlist *src,
unsigned int ivsize,
struct chcr_aead_ctx *aeadctx)
{
unsigned int frags = 0;
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
/* b0 and aad length(if available) */
write_buffer_to_skb(skb, &frags, reqctx->scratch_pad, CCM_B0_SIZE +
(req->assoclen ? CCM_AAD_FIELD_SIZE : 0));
if (req->assoclen) {
if (get_aead_subtype(tfm) == CRYPTO_ALG_SUB_TYPE_AEAD_RFC4309)
write_sg_to_skb(skb, &frags, req->src,
req->assoclen - 8);
else
write_sg_to_skb(skb, &frags, req->src, req->assoclen);
}
write_buffer_to_skb(skb, &frags, reqctx->iv, ivsize);
if (req->cryptlen)
write_sg_to_skb(skb, &frags, src, req->cryptlen);
return frags;
}
static struct sk_buff *create_aead_ccm_wr(struct aead_request *req,
unsigned short qid,
int size,
unsigned short op_type)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct chcr_context *ctx = crypto_aead_ctx(tfm);
struct uld_ctx *u_ctx = ULD_CTX(ctx);
struct chcr_aead_ctx *aeadctx = AEAD_CTX(ctx);
struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
struct sk_buff *skb = NULL;
struct chcr_wr *chcr_req;
struct cpl_rx_phys_dsgl *phys_cpl;
struct phys_sge_parm sg_param;
struct scatterlist *src;
unsigned int frags = 0, transhdr_len, ivsize = AES_BLOCK_SIZE;
unsigned int dst_size = 0, kctx_len, nents;
unsigned int sub_type;
unsigned int authsize = crypto_aead_authsize(tfm);
int error = -EINVAL, src_nent;
gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
GFP_ATOMIC;
struct adapter *adap = padap(ctx->dev);
dst_size = req->assoclen + req->cryptlen + (op_type ? -authsize :
authsize);
reqctx->newdstsg = NULL;
if (op_type && req->cryptlen < crypto_aead_authsize(tfm))
goto err;
src_nent = sg_nents_for_len(req->src, req->assoclen + req->cryptlen);
if (src_nent < 0)
goto err;
sub_type = get_aead_subtype(tfm);
src = scatterwalk_ffwd(reqctx->srcffwd, req->src, req->assoclen);
if (req->src != req->dst) {
error = chcr_copy_assoc(req, aeadctx);
if (error) {
pr_err("AAD copy to destination buffer fails\n");
return ERR_PTR(error);
}
}
if (dst_size && is_newsg(req->dst, &nents)) {
reqctx->newdstsg = alloc_new_sg(req->dst, nents);
if (IS_ERR(reqctx->newdstsg))
return ERR_CAST(reqctx->newdstsg);
reqctx->dst = scatterwalk_ffwd(reqctx->dstffwd,
reqctx->newdstsg, req->assoclen);
} else {
if (req->src == req->dst)
reqctx->dst = src;
else
reqctx->dst = scatterwalk_ffwd(reqctx->dstffwd,
req->dst, req->assoclen);
}
reqctx->dst_nents = sg_nents_for_len(reqctx->dst, req->cryptlen +
(op_type ? -authsize : authsize));
if (reqctx->dst_nents < 0) {
pr_err("CCM:Invalid Destination sg entries\n");
error = -EINVAL;
goto err;
}
error = aead_ccm_validate_input(op_type, req, aeadctx, sub_type);
if (error)
goto err;
dst_size = get_space_for_phys_dsgl(reqctx->dst_nents);
kctx_len = ((DIV_ROUND_UP(aeadctx->enckey_len, 16)) << 4) * 2;
transhdr_len = CIPHER_TRANSHDR_SIZE(kctx_len, dst_size);
if (chcr_aead_need_fallback(req, src_nent + MIN_CCM_SG,
T6_MAX_AAD_SIZE - 18,
transhdr_len + (sgl_len(src_nent + MIN_CCM_SG) * 8),
op_type)) {
atomic_inc(&adap->chcr_stats.fallback);
free_new_sg(reqctx->newdstsg);
reqctx->newdstsg = NULL;
return ERR_PTR(chcr_aead_fallback(req, op_type));
}
skb = alloc_skb((transhdr_len + sizeof(struct sge_opaque_hdr)), flags);
if (!skb) {
error = -ENOMEM;
goto err;
}
skb_reserve(skb, sizeof(struct sge_opaque_hdr));
chcr_req = __skb_put_zero(skb, transhdr_len);
fill_sec_cpl_for_aead(&chcr_req->sec_cpl, dst_size, req, op_type, ctx);
chcr_req->key_ctx.ctx_hdr = aeadctx->key_ctx_hdr;
memcpy(chcr_req->key_ctx.key, aeadctx->key, aeadctx->enckey_len);
memcpy(chcr_req->key_ctx.key + (DIV_ROUND_UP(aeadctx->enckey_len, 16) *
16), aeadctx->key, aeadctx->enckey_len);
phys_cpl = (struct cpl_rx_phys_dsgl *)((u8 *)(chcr_req + 1) + kctx_len);
error = ccm_format_packet(req, aeadctx, sub_type, op_type);
if (error)
goto dstmap_fail;
sg_param.nents = reqctx->dst_nents;
sg_param.obsize = req->cryptlen + (op_type ? -authsize : authsize);
sg_param.qid = qid;
error = map_writesg_phys_cpl(&u_ctx->lldi.pdev->dev, phys_cpl,
reqctx->dst, &sg_param);
if (error)
goto dstmap_fail;
skb_set_transport_header(skb, transhdr_len);
frags = fill_aead_req_fields(skb, req, src, ivsize, aeadctx);
atomic_inc(&adap->chcr_stats.aead_rqst);
create_wreq(ctx, chcr_req, &req->base, skb, kctx_len, 0, 1,
sizeof(struct cpl_rx_phys_dsgl) + dst_size, 0);
reqctx->skb = skb;
skb_get(skb);
return skb;
dstmap_fail:
kfree_skb(skb);
err:
free_new_sg(reqctx->newdstsg);
reqctx->newdstsg = NULL;
return ERR_PTR(error);
}
static struct sk_buff *create_gcm_wr(struct aead_request *req,
unsigned short qid,
int size,
unsigned short op_type)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct chcr_context *ctx = crypto_aead_ctx(tfm);
struct uld_ctx *u_ctx = ULD_CTX(ctx);
struct chcr_aead_ctx *aeadctx = AEAD_CTX(ctx);
struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
struct sk_buff *skb = NULL;
struct chcr_wr *chcr_req;
struct cpl_rx_phys_dsgl *phys_cpl;
struct phys_sge_parm sg_param;
struct scatterlist *src;
unsigned int frags = 0, transhdr_len;
unsigned int ivsize = AES_BLOCK_SIZE;
unsigned int dst_size = 0, kctx_len, nents, assoclen = req->assoclen;
unsigned char tag_offset = 0;
unsigned int authsize = crypto_aead_authsize(tfm);
int error = -EINVAL, src_nent;
gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
GFP_ATOMIC;
struct adapter *adap = padap(ctx->dev);
reqctx->newdstsg = NULL;
dst_size = assoclen + req->cryptlen + (op_type ? -authsize :
authsize);
/* validate key size */
if (aeadctx->enckey_len == 0)
goto err;
if (op_type && req->cryptlen < crypto_aead_authsize(tfm))
goto err;
src_nent = sg_nents_for_len(req->src, assoclen + req->cryptlen);
if (src_nent < 0)
goto err;
src = scatterwalk_ffwd(reqctx->srcffwd, req->src, assoclen);
if (req->src != req->dst) {
error = chcr_copy_assoc(req, aeadctx);
if (error)
return ERR_PTR(error);
}
if (dst_size && is_newsg(req->dst, &nents)) {
reqctx->newdstsg = alloc_new_sg(req->dst, nents);
if (IS_ERR(reqctx->newdstsg))
return ERR_CAST(reqctx->newdstsg);
reqctx->dst = scatterwalk_ffwd(reqctx->dstffwd,
reqctx->newdstsg, assoclen);
} else {
if (req->src == req->dst)
reqctx->dst = src;
else
reqctx->dst = scatterwalk_ffwd(reqctx->dstffwd,
req->dst, assoclen);
}
reqctx->dst_nents = sg_nents_for_len(reqctx->dst, req->cryptlen +
(op_type ? -authsize : authsize));
if (reqctx->dst_nents < 0) {
pr_err("GCM:Invalid Destination sg entries\n");
error = -EINVAL;
goto err;
}
dst_size = get_space_for_phys_dsgl(reqctx->dst_nents);
kctx_len = ((DIV_ROUND_UP(aeadctx->enckey_len, 16)) << 4) +
AEAD_H_SIZE;
transhdr_len = CIPHER_TRANSHDR_SIZE(kctx_len, dst_size);
if (chcr_aead_need_fallback(req, src_nent + MIN_GCM_SG,
T6_MAX_AAD_SIZE,
transhdr_len + (sgl_len(src_nent + MIN_GCM_SG) * 8),
op_type)) {
atomic_inc(&adap->chcr_stats.fallback);
free_new_sg(reqctx->newdstsg);
reqctx->newdstsg = NULL;
return ERR_PTR(chcr_aead_fallback(req, op_type));
}
skb = alloc_skb((transhdr_len + sizeof(struct sge_opaque_hdr)), flags);
if (!skb) {
error = -ENOMEM;
goto err;
}
/* NIC driver is going to write the sge hdr. */
skb_reserve(skb, sizeof