crypto: caam - refactor ahash shared descriptor generation

Move ahash shared descriptor generation into a single function.
Currently there is no plan to support ahash on any other interface
besides the Job Ring, thus for now the functionality is not exported.

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
index 505007d0277cfc6587b96b7392427f8a7373c71d..e58639ea53b11e97bb06c91fd117ca8b1f30983a 100644 (file)
--- a/drivers/crypto/caam/caamhash.c
+++ b/drivers/crypto/caam/caamhash.c
@@ -217,86 +217,54 @@ static inline int ctx_map_to_sec4_sg(u32 *desc, struct device *jrdev,
        return 0;
 }
 
-/* Common shared descriptor commands */
-static inline void append_key_ahash(u32 *desc, struct caam_hash_ctx *ctx)
-{
-       append_key_as_imm(desc, ctx->key, ctx->adata.keylen_pad,
-                         ctx->adata.keylen, CLASS_2 | KEY_DEST_MDHA_SPLIT |
-                         KEY_ENC);
-}
-
-/* Append key if it has been set */
-static inline void init_sh_desc_key_ahash(u32 *desc, struct caam_hash_ctx *ctx)
-{
-       u32 *key_jump_cmd;
-
-       init_sh_desc(desc, HDR_SHARE_SERIAL);
-
-       if (ctx->adata.keylen) {
-               /* Skip if already shared */
-               key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
-                                          JUMP_COND_SHRD);
-
-               append_key_ahash(desc, ctx);
-
-               set_jump_tgt_here(desc, key_jump_cmd);
-       }
-}
-
 /*
- * For ahash read data from seqin following state->caam_ctx,
- * and write resulting class2 context to seqout, which may be state->caam_ctx
- * or req->result
+ * For ahash update, final and finup (import_ctx = true)
+ *     import context, read and write to seqout
+ * For ahash firsts and digest (import_ctx = false)
+ *     read and write to seqout
  */
-static inline void ahash_append_load_str(u32 *desc, int digestsize)
+static inline void ahash_gen_sh_desc(u32 *desc, u32 state, int digestsize,
+                                    struct caam_hash_ctx *ctx, bool import_ctx)
 {
-       /* Calculate remaining bytes to read */
-       append_math_add(desc, VARSEQINLEN, SEQINLEN, REG0, CAAM_CMD_SZ);
+       u32 op = ctx->adata.algtype;
+       u32 *skip_key_load;
 
-       /* Read remaining bytes */
-       append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS2 | FIFOLD_TYPE_LAST2 |
-                            FIFOLD_TYPE_MSG | KEY_VLF);
-
-       /* Store class2 context bytes */
-       append_seq_store(desc, digestsize, LDST_CLASS_2_CCB |
-                        LDST_SRCDST_BYTE_CONTEXT);
-}
+       init_sh_desc(desc, HDR_SHARE_SERIAL);
 
-/*
- * For ahash update, final and finup, import context, read and write to seqout
- */
-static inline void ahash_ctx_data_to_out(u32 *desc, u32 op, u32 state,
-                                        int digestsize,
-                                        struct caam_hash_ctx *ctx)
-{
-       init_sh_desc_key_ahash(desc, ctx);
+       /* Append key if it has been set; ahash update excluded */
+       if ((state != OP_ALG_AS_UPDATE) && (ctx->adata.keylen)) {
+               /* Skip key loading if already shared */
+               skip_key_load = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
+                                           JUMP_COND_SHRD);
 
-       /* Import context from software */
-       append_seq_load(desc, ctx->ctx_len, LDST_CLASS_2_CCB |
-                       LDST_SRCDST_BYTE_CONTEXT);
+               append_key_as_imm(desc, ctx->key, ctx->adata.keylen_pad,
+                                 ctx->adata.keylen, CLASS_2 |
+                                 KEY_DEST_MDHA_SPLIT | KEY_ENC);
 
-       /* Class 2 operation */
-       append_operation(desc, op | state | OP_ALG_ENCRYPT);
+               set_jump_tgt_here(desc, skip_key_load);
 
-       /*
-        * Load from buf and/or src and write to req->result or state->context
-        */
-       ahash_append_load_str(desc, digestsize);
-}
+               op |= OP_ALG_AAI_HMAC_PRECOMP;
+       }
 
-/* For ahash firsts and digest, read and write to seqout */
-static inline void ahash_data_to_out(u32 *desc, u32 op, u32 state,
-                                    int digestsize, struct caam_hash_ctx *ctx)
-{
-       init_sh_desc_key_ahash(desc, ctx);
+       /* If needed, import context from software */
+       if (import_ctx)
+               append_seq_load(desc, ctx->ctx_len, LDST_CLASS_2_CCB |
+                               LDST_SRCDST_BYTE_CONTEXT);
 
        /* Class 2 operation */
        append_operation(desc, op | state | OP_ALG_ENCRYPT);
 
        /*
         * Load from buf and/or src and write to req->result or state->context
+        * Calculate remaining bytes to read
         */
-       ahash_append_load_str(desc, digestsize);
+       append_math_add(desc, VARSEQINLEN, SEQINLEN, REG0, CAAM_CMD_SZ);
+       /* Read remaining bytes */
+       append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS2 | FIFOLD_TYPE_LAST2 |
+                            FIFOLD_TYPE_MSG | KEY_VLF);
+       /* Store class2 context bytes */
+       append_seq_store(desc, digestsize, LDST_CLASS_2_CCB |
+                        LDST_SRCDST_BYTE_CONTEXT);
 }
 
 static int ahash_set_sh_desc(struct crypto_ahash *ahash)
@@ -304,28 +272,11 @@ static int ahash_set_sh_desc(struct crypto_ahash *ahash)
        struct caam_hash_ctx *ctx = crypto_ahash_ctx(ahash);
        int digestsize = crypto_ahash_digestsize(ahash);
        struct device *jrdev = ctx->jrdev;
-       u32 have_key = 0;
        u32 *desc;
 
-       if (ctx->adata.keylen)
-               have_key = OP_ALG_AAI_HMAC_PRECOMP;
-
        /* ahash_update shared descriptor */
        desc = ctx->sh_desc_update;
-
-       init_sh_desc(desc, HDR_SHARE_SERIAL);
-
-       /* Import context from software */
-       append_seq_load(desc, ctx->ctx_len, LDST_CLASS_2_CCB |
-                       LDST_SRCDST_BYTE_CONTEXT);
-
-       /* Class 2 operation */
-       append_operation(desc, ctx->adata.algtype | OP_ALG_AS_UPDATE |
-                        OP_ALG_ENCRYPT);
-
-       /* Load data and write to result or context */
-       ahash_append_load_str(desc, ctx->ctx_len);
-
+       ahash_gen_sh_desc(desc, OP_ALG_AS_UPDATE, ctx->ctx_len, ctx, true);
        ctx->sh_desc_update_dma = dma_map_single(jrdev, desc, desc_bytes(desc),
                                                 DMA_TO_DEVICE);
        if (dma_mapping_error(jrdev, ctx->sh_desc_update_dma)) {
@@ -340,10 +291,7 @@ static int ahash_set_sh_desc(struct crypto_ahash *ahash)
 
        /* ahash_update_first shared descriptor */
        desc = ctx->sh_desc_update_first;
-
-       ahash_data_to_out(desc, have_key | ctx->adata.algtype, OP_ALG_AS_INIT,
-                         ctx->ctx_len, ctx);
-
+       ahash_gen_sh_desc(desc, OP_ALG_AS_INIT, ctx->ctx_len, ctx, false);
        ctx->sh_desc_update_first_dma = dma_map_single(jrdev, desc,
                                                       desc_bytes(desc),
                                                       DMA_TO_DEVICE);
@@ -359,10 +307,7 @@ static int ahash_set_sh_desc(struct crypto_ahash *ahash)
 
        /* ahash_final shared descriptor */
        desc = ctx->sh_desc_fin;
-
-       ahash_ctx_data_to_out(desc, have_key | ctx->adata.algtype,
-                             OP_ALG_AS_FINALIZE, digestsize, ctx);
-
+       ahash_gen_sh_desc(desc, OP_ALG_AS_FINALIZE, digestsize, ctx, true);
        ctx->sh_desc_fin_dma = dma_map_single(jrdev, desc, desc_bytes(desc),
                                              DMA_TO_DEVICE);
        if (dma_mapping_error(jrdev, ctx->sh_desc_fin_dma)) {
@@ -377,10 +322,7 @@ static int ahash_set_sh_desc(struct crypto_ahash *ahash)
 
        /* ahash_digest shared descriptor */
        desc = ctx->sh_desc_digest;
-
-       ahash_data_to_out(desc, have_key | ctx->adata.algtype,
-                         OP_ALG_AS_INITFINAL, digestsize, ctx);
-
+       ahash_gen_sh_desc(desc, OP_ALG_AS_INITFINAL, digestsize, ctx, false);
        ctx->sh_desc_digest_dma = dma_map_single(jrdev, desc,
                                                 desc_bytes(desc),
                                                 DMA_TO_DEVICE);