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authorHoria Geanta <horia.geanta@freescale.com>2012-08-02 17:16:40 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2012-08-28 23:56:27 +0800
commit79fd31d355f7e315025a330adc2183fb5ae8f22d (patch)
treee32735f1d0dc615bf9ff66a2b01a4dcef381a0a2 /drivers/crypto/talitos.c
parent2a1cfe46b17f6dd43fcd8eb2b5e5deaa2a94e4bb (diff)
downloadlinux-linaro-stable-79fd31d355f7e315025a330adc2183fb5ae8f22d.tar.gz
crypto: talitos - support for assoc data provided as scatterlist
Generate a link table in case assoc data is a scatterlist. While at it, add support for handling non-contiguous assoc data and iv. Signed-off-by: Horia Geanta <horia.geanta@freescale.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/talitos.c')
-rw-r--r--drivers/crypto/talitos.c176
1 files changed, 125 insertions, 51 deletions
diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index 2cba392f1682..bea25e291a5a 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -714,10 +714,13 @@ badkey:
/*
* talitos_edesc - s/w-extended descriptor
+ * @assoc_nents: number of segments in associated data scatterlist
* @src_nents: number of segments in input scatterlist
* @dst_nents: number of segments in output scatterlist
+ * @assoc_chained: whether assoc is chained or not
* @src_chained: whether src is chained or not
* @dst_chained: whether dst is chained or not
+ * @iv_dma: dma address of iv for checking continuity and link table
* @dma_len: length of dma mapped link_tbl space
* @dma_link_tbl: bus physical address of link_tbl
* @desc: h/w descriptor
@@ -728,10 +731,13 @@ badkey:
* of link_tbl data
*/
struct talitos_edesc {
+ int assoc_nents;
int src_nents;
int dst_nents;
+ bool assoc_chained;
bool src_chained;
bool dst_chained;
+ dma_addr_t iv_dma;
int dma_len;
dma_addr_t dma_link_tbl;
struct talitos_desc desc;
@@ -799,7 +805,13 @@ static void ipsec_esp_unmap(struct device *dev,
unmap_single_talitos_ptr(dev, &edesc->desc.ptr[2], DMA_TO_DEVICE);
unmap_single_talitos_ptr(dev, &edesc->desc.ptr[0], DMA_TO_DEVICE);
- dma_unmap_sg(dev, areq->assoc, 1, DMA_TO_DEVICE);
+ if (edesc->assoc_chained)
+ talitos_unmap_sg_chain(dev, areq->assoc, DMA_TO_DEVICE);
+ else
+ /* assoc_nents counts also for IV in non-contiguous cases */
+ dma_unmap_sg(dev, areq->assoc,
+ edesc->assoc_nents ? edesc->assoc_nents - 1 : 1,
+ DMA_TO_DEVICE);
talitos_sg_unmap(dev, edesc, areq->src, areq->dst);
@@ -829,7 +841,8 @@ static void ipsec_esp_encrypt_done(struct device *dev,
/* copy the generated ICV to dst */
if (edesc->dst_nents) {
icvdata = &edesc->link_tbl[edesc->src_nents +
- edesc->dst_nents + 2];
+ edesc->dst_nents + 2 +
+ edesc->assoc_nents];
sg = sg_last(areq->dst, edesc->dst_nents);
memcpy((char *)sg_virt(sg) + sg->length - ctx->authsize,
icvdata, ctx->authsize);
@@ -859,7 +872,8 @@ static void ipsec_esp_decrypt_swauth_done(struct device *dev,
/* auth check */
if (edesc->dma_len)
icvdata = &edesc->link_tbl[edesc->src_nents +
- edesc->dst_nents + 2];
+ edesc->dst_nents + 2 +
+ edesc->assoc_nents];
else
icvdata = &edesc->link_tbl[0];
@@ -934,10 +948,9 @@ static int sg_to_link_tbl(struct scatterlist *sg, int sg_count,
* fill in and submit ipsec_esp descriptor
*/
static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
- u8 *giv, u64 seq,
- void (*callback) (struct device *dev,
- struct talitos_desc *desc,
- void *context, int error))
+ u64 seq, void (*callback) (struct device *dev,
+ struct talitos_desc *desc,
+ void *context, int error))
{
struct crypto_aead *aead = crypto_aead_reqtfm(areq);
struct talitos_ctx *ctx = crypto_aead_ctx(aead);
@@ -952,12 +965,42 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
/* hmac key */
map_single_talitos_ptr(dev, &desc->ptr[0], ctx->authkeylen, &ctx->key,
0, DMA_TO_DEVICE);
+
/* hmac data */
- map_single_talitos_ptr(dev, &desc->ptr[1], areq->assoclen + ivsize,
- sg_virt(areq->assoc), 0, DMA_TO_DEVICE);
+ desc->ptr[1].len = cpu_to_be16(areq->assoclen + ivsize);
+ if (edesc->assoc_nents) {
+ int tbl_off = edesc->src_nents + edesc->dst_nents + 2;
+ struct talitos_ptr *tbl_ptr = &edesc->link_tbl[tbl_off];
+
+ to_talitos_ptr(&desc->ptr[1], edesc->dma_link_tbl + tbl_off *
+ sizeof(struct talitos_ptr));
+ desc->ptr[1].j_extent = DESC_PTR_LNKTBL_JUMP;
+
+ /* assoc_nents - 1 entries for assoc, 1 for IV */
+ sg_count = sg_to_link_tbl(areq->assoc, edesc->assoc_nents - 1,
+ areq->assoclen, tbl_ptr);
+
+ /* add IV to link table */
+ tbl_ptr += sg_count - 1;
+ tbl_ptr->j_extent = 0;
+ tbl_ptr++;
+ to_talitos_ptr(tbl_ptr, edesc->iv_dma);
+ tbl_ptr->len = cpu_to_be16(ivsize);
+ tbl_ptr->j_extent = DESC_PTR_LNKTBL_RETURN;
+
+ dma_sync_single_for_device(dev, edesc->dma_link_tbl,
+ edesc->dma_len, DMA_BIDIRECTIONAL);
+ } else {
+ to_talitos_ptr(&desc->ptr[1], sg_dma_address(areq->assoc));
+ desc->ptr[1].j_extent = 0;
+ }
+
/* cipher iv */
- map_single_talitos_ptr(dev, &desc->ptr[2], ivsize, giv ?: areq->iv, 0,
- DMA_TO_DEVICE);
+ to_talitos_ptr(&desc->ptr[2], edesc->iv_dma);
+ desc->ptr[2].len = cpu_to_be16(ivsize);
+ desc->ptr[2].j_extent = 0;
+ /* Sync needed for the aead_givencrypt case */
+ dma_sync_single_for_device(dev, edesc->iv_dma, ivsize, DMA_TO_DEVICE);
/* cipher key */
map_single_talitos_ptr(dev, &desc->ptr[3], ctx->enckeylen,
@@ -1013,26 +1056,25 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
if (sg_count == 1) {
to_talitos_ptr(&desc->ptr[5], sg_dma_address(areq->dst));
} else {
- struct talitos_ptr *link_tbl_ptr =
- &edesc->link_tbl[edesc->src_nents + 1];
+ int tbl_off = edesc->src_nents + 1;
+ struct talitos_ptr *tbl_ptr = &edesc->link_tbl[tbl_off];
to_talitos_ptr(&desc->ptr[5], edesc->dma_link_tbl +
- (edesc->src_nents + 1) *
- sizeof(struct talitos_ptr));
+ tbl_off * sizeof(struct talitos_ptr));
sg_count = sg_to_link_tbl(areq->dst, sg_count, cryptlen,
- link_tbl_ptr);
+ tbl_ptr);
/* Add an entry to the link table for ICV data */
- link_tbl_ptr += sg_count - 1;
- link_tbl_ptr->j_extent = 0;
- sg_count++;
- link_tbl_ptr++;
- link_tbl_ptr->j_extent = DESC_PTR_LNKTBL_RETURN;
- link_tbl_ptr->len = cpu_to_be16(authsize);
+ tbl_ptr += sg_count - 1;
+ tbl_ptr->j_extent = 0;
+ tbl_ptr++;
+ tbl_ptr->j_extent = DESC_PTR_LNKTBL_RETURN;
+ tbl_ptr->len = cpu_to_be16(authsize);
/* icv data follows link tables */
- to_talitos_ptr(link_tbl_ptr, edesc->dma_link_tbl +
- (edesc->src_nents + edesc->dst_nents + 2) *
+ to_talitos_ptr(tbl_ptr, edesc->dma_link_tbl +
+ (tbl_off + edesc->dst_nents + 1 +
+ edesc->assoc_nents) *
sizeof(struct talitos_ptr));
desc->ptr[5].j_extent |= DESC_PTR_LNKTBL_JUMP;
dma_sync_single_for_device(ctx->dev, edesc->dma_link_tbl,
@@ -1133,16 +1175,21 @@ static size_t sg_copy_end_to_buffer(struct scatterlist *sgl, unsigned int nents,
* allocate and map the extended descriptor
*/
static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
+ struct scatterlist *assoc,
struct scatterlist *src,
struct scatterlist *dst,
+ u8 *iv,
+ unsigned int assoclen,
unsigned int cryptlen,
unsigned int authsize,
+ unsigned int ivsize,
int icv_stashing,
u32 cryptoflags)
{
struct talitos_edesc *edesc;
- int src_nents, dst_nents, alloc_len, dma_len;
- bool src_chained, dst_chained = false;
+ int assoc_nents = 0, src_nents, dst_nents, alloc_len, dma_len;
+ bool assoc_chained = false, src_chained = false, dst_chained = false;
+ dma_addr_t iv_dma = 0;
gfp_t flags = cryptoflags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
GFP_ATOMIC;
@@ -1151,6 +1198,25 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
return ERR_PTR(-EINVAL);
}
+ if (iv)
+ iv_dma = dma_map_single(dev, iv, ivsize, DMA_TO_DEVICE);
+
+ if (assoc) {
+ /*
+ * Currently it is assumed that iv is provided whenever assoc
+ * is.
+ */
+ BUG_ON(!iv);
+
+ assoc_nents = sg_count(assoc, assoclen, &assoc_chained);
+ talitos_map_sg(dev, assoc, assoc_nents, DMA_TO_DEVICE,
+ assoc_chained);
+ assoc_nents = (assoc_nents == 1) ? 0 : assoc_nents;
+
+ if (assoc_nents || sg_dma_address(assoc) + assoclen != iv_dma)
+ assoc_nents = assoc_nents ? assoc_nents + 1 : 2;
+ }
+
src_nents = sg_count(src, cryptlen + authsize, &src_chained);
src_nents = (src_nents == 1) ? 0 : src_nents;
@@ -1172,9 +1238,9 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
* and the ICV data itself
*/
alloc_len = sizeof(struct talitos_edesc);
- if (src_nents || dst_nents) {
- dma_len = (src_nents + dst_nents + 2) *
- sizeof(struct talitos_ptr) + authsize;
+ if (assoc_nents || src_nents || dst_nents) {
+ dma_len = (src_nents + dst_nents + 2 + assoc_nents) *
+ sizeof(struct talitos_ptr) + authsize;
alloc_len += dma_len;
} else {
dma_len = 0;
@@ -1183,14 +1249,20 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
edesc = kmalloc(alloc_len, GFP_DMA | flags);
if (!edesc) {
+ talitos_unmap_sg_chain(dev, assoc, DMA_TO_DEVICE);
+ if (iv_dma)
+ dma_unmap_single(dev, iv_dma, ivsize, DMA_TO_DEVICE);
dev_err(dev, "could not allocate edescriptor\n");
return ERR_PTR(-ENOMEM);
}
+ edesc->assoc_nents = assoc_nents;
edesc->src_nents = src_nents;
edesc->dst_nents = dst_nents;
+ edesc->assoc_chained = assoc_chained;
edesc->src_chained = src_chained;
edesc->dst_chained = dst_chained;
+ edesc->iv_dma = iv_dma;
edesc->dma_len = dma_len;
if (dma_len)
edesc->dma_link_tbl = dma_map_single(dev, &edesc->link_tbl[0],
@@ -1200,14 +1272,16 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
return edesc;
}
-static struct talitos_edesc *aead_edesc_alloc(struct aead_request *areq,
+static struct talitos_edesc *aead_edesc_alloc(struct aead_request *areq, u8 *iv,
int icv_stashing)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
+ unsigned int ivsize = crypto_aead_ivsize(authenc);
- return talitos_edesc_alloc(ctx->dev, areq->src, areq->dst,
- areq->cryptlen, ctx->authsize, icv_stashing,
+ return talitos_edesc_alloc(ctx->dev, areq->assoc, areq->src, areq->dst,
+ iv, areq->assoclen, areq->cryptlen,
+ ctx->authsize, ivsize, icv_stashing,
areq->base.flags);
}
@@ -1218,14 +1292,14 @@ static int aead_encrypt(struct aead_request *req)
struct talitos_edesc *edesc;
/* allocate extended descriptor */
- edesc = aead_edesc_alloc(req, 0);
+ edesc = aead_edesc_alloc(req, req->iv, 0);
if (IS_ERR(edesc))
return PTR_ERR(edesc);
/* set encrypt */
edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_MODE0_ENCRYPT;
- return ipsec_esp(edesc, req, NULL, 0, ipsec_esp_encrypt_done);
+ return ipsec_esp(edesc, req, 0, ipsec_esp_encrypt_done);
}
static int aead_decrypt(struct aead_request *req)
@@ -1241,7 +1315,7 @@ static int aead_decrypt(struct aead_request *req)
req->cryptlen -= authsize;
/* allocate extended descriptor */
- edesc = aead_edesc_alloc(req, 1);
+ edesc = aead_edesc_alloc(req, req->iv, 1);
if (IS_ERR(edesc))
return PTR_ERR(edesc);
@@ -1257,9 +1331,7 @@ static int aead_decrypt(struct aead_request *req)
/* reset integrity check result bits */
edesc->desc.hdr_lo = 0;
- return ipsec_esp(edesc, req, NULL, 0,
- ipsec_esp_decrypt_hwauth_done);
-
+ return ipsec_esp(edesc, req, 0, ipsec_esp_decrypt_hwauth_done);
}
/* Have to check the ICV with software */
@@ -1268,7 +1340,8 @@ static int aead_decrypt(struct aead_request *req)
/* stash incoming ICV for later cmp with ICV generated by the h/w */
if (edesc->dma_len)
icvdata = &edesc->link_tbl[edesc->src_nents +
- edesc->dst_nents + 2];
+ edesc->dst_nents + 2 +
+ edesc->assoc_nents];
else
icvdata = &edesc->link_tbl[0];
@@ -1277,7 +1350,7 @@ static int aead_decrypt(struct aead_request *req)
memcpy(icvdata, (char *)sg_virt(sg) + sg->length - ctx->authsize,
ctx->authsize);
- return ipsec_esp(edesc, req, NULL, 0, ipsec_esp_decrypt_swauth_done);
+ return ipsec_esp(edesc, req, 0, ipsec_esp_decrypt_swauth_done);
}
static int aead_givencrypt(struct aead_givcrypt_request *req)
@@ -1288,7 +1361,7 @@ static int aead_givencrypt(struct aead_givcrypt_request *req)
struct talitos_edesc *edesc;
/* allocate extended descriptor */
- edesc = aead_edesc_alloc(areq, 0);
+ edesc = aead_edesc_alloc(areq, req->giv, 0);
if (IS_ERR(edesc))
return PTR_ERR(edesc);
@@ -1299,8 +1372,7 @@ static int aead_givencrypt(struct aead_givcrypt_request *req)
/* avoid consecutive packets going out with same IV */
*(__be64 *)req->giv ^= cpu_to_be64(req->seq);
- return ipsec_esp(edesc, areq, req->giv, req->seq,
- ipsec_esp_encrypt_done);
+ return ipsec_esp(edesc, areq, req->seq, ipsec_esp_encrypt_done);
}
static int ablkcipher_setkey(struct crypto_ablkcipher *cipher,
@@ -1356,7 +1428,7 @@ static int common_nonsnoop(struct talitos_edesc *edesc,
struct device *dev = ctx->dev;
struct talitos_desc *desc = &edesc->desc;
unsigned int cryptlen = areq->nbytes;
- unsigned int ivsize;
+ unsigned int ivsize = crypto_ablkcipher_ivsize(cipher);
int sg_count, ret;
/* first DWORD empty */
@@ -1365,9 +1437,9 @@ static int common_nonsnoop(struct talitos_edesc *edesc,
desc->ptr[0].j_extent = 0;
/* cipher iv */
- ivsize = crypto_ablkcipher_ivsize(cipher);
- map_single_talitos_ptr(dev, &desc->ptr[1], ivsize, areq->info, 0,
- DMA_TO_DEVICE);
+ to_talitos_ptr(&desc->ptr[1], edesc->iv_dma);
+ desc->ptr[1].len = cpu_to_be16(ivsize);
+ desc->ptr[1].j_extent = 0;
/* cipher key */
map_single_talitos_ptr(dev, &desc->ptr[2], ctx->keylen,
@@ -1449,9 +1521,11 @@ static struct talitos_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request *
{
struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
+ unsigned int ivsize = crypto_ablkcipher_ivsize(cipher);
- return talitos_edesc_alloc(ctx->dev, areq->src, areq->dst, areq->nbytes,
- 0, 0, areq->base.flags);
+ return talitos_edesc_alloc(ctx->dev, NULL, areq->src, areq->dst,
+ areq->info, 0, areq->nbytes, 0, ivsize, 0,
+ areq->base.flags);
}
static int ablkcipher_encrypt(struct ablkcipher_request *areq)
@@ -1629,8 +1703,8 @@ static struct talitos_edesc *ahash_edesc_alloc(struct ahash_request *areq,
struct talitos_ctx *ctx = crypto_ahash_ctx(tfm);
struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq);
- return talitos_edesc_alloc(ctx->dev, req_ctx->psrc, NULL, nbytes, 0, 0,
- areq->base.flags);
+ return talitos_edesc_alloc(ctx->dev, NULL, req_ctx->psrc, NULL, NULL, 0,
+ nbytes, 0, 0, 0, areq->base.flags);
}
static int ahash_init(struct ahash_request *areq)