1 files changed, 364 insertions, 0 deletions
diff --git a/drivers/crypto/cavium/nitrox/nitrox_aead.c b/drivers/crypto/cavium/nitrox/nitrox_aead.c
new file mode 100644
index 000000000000..4f43eacd2557
--- /dev/null
+++ b/drivers/crypto/cavium/nitrox/nitrox_aead.c
@@ -0,0 +1,364 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kernel.h>
+#include <linux/printk.h>
+#include <linux/crypto.h>
+#include <linux/rtnetlink.h>
+
+#include <crypto/aead.h>
+#include <crypto/authenc.h>
+#include <crypto/des.h>
+#include <crypto/sha.h>
+#include <crypto/internal/aead.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/gcm.h>
+
+#include "nitrox_dev.h"
+#include "nitrox_common.h"
+#include "nitrox_req.h"
+
+#define GCM_AES_SALT_SIZE	4
+
+/**
+ * struct nitrox_crypt_params - Params to set nitrox crypto request.
+ * @cryptlen: Encryption/Decryption data length
+ * @authlen: Assoc data length + Cryptlen
+ * @srclen: Input buffer length
+ * @dstlen: Output buffer length
+ * @iv: IV data
+ * @ivsize: IV data length
+ * @ctrl_arg: Identifies the request type (ENCRYPT/DECRYPT)
+ */
+struct nitrox_crypt_params {
+	unsigned int cryptlen;
+	unsigned int authlen;
+	unsigned int srclen;
+	unsigned int dstlen;
+	u8 *iv;
+	int ivsize;
+	u8 ctrl_arg;
+};
+
+union gph_p3 {
+	struct {
+#ifdef __BIG_ENDIAN_BITFIELD
+		u16 iv_offset : 8;
+		u16 auth_offset	: 8;
+#else
+		u16 auth_offset	: 8;
+		u16 iv_offset : 8;
+#endif
+	};
+	u16 param;
+};
+
+static int nitrox_aes_gcm_setkey(struct crypto_aead *aead, const u8 *key,
+				 unsigned int keylen)
+{
+	int aes_keylen;
+	struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
+	struct flexi_crypto_context *fctx;
+	union fc_ctx_flags flags;
+
+	aes_keylen = flexi_aes_keylen(keylen);
+	if (aes_keylen < 0) {
+		crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		return -EINVAL;
+	}
+
+	/* fill crypto context */
+	fctx = nctx->u.fctx;
+	flags.f = be64_to_cpu(fctx->flags.f);
+	flags.w0.aes_keylen = aes_keylen;
+	fctx->flags.f = cpu_to_be64(flags.f);
+
+	/* copy enc key to context */
+	memset(&fctx->crypto, 0, sizeof(fctx->crypto));
+	memcpy(fctx->crypto.u.key, key, keylen);
+
+	return 0;
+}
+
+static int nitrox_aead_setauthsize(struct crypto_aead *aead,
+				   unsigned int authsize)
+{
+	struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
+	struct flexi_crypto_context *fctx = nctx->u.fctx;
+	union fc_ctx_flags flags;
+
+	flags.f = be64_to_cpu(fctx->flags.f);
+	flags.w0.mac_len = authsize;
+	fctx->flags.f = cpu_to_be64(flags.f);
+
+	aead->authsize = authsize;
+
+	return 0;
+}
+
+static int alloc_src_sglist(struct aead_request *areq, char *iv, int ivsize,
+			    int buflen)
+{
+	struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);
+	int nents = sg_nents_for_len(areq->src, buflen) + 1;
+	int ret;
+
+	if (nents < 0)
+		return nents;
+
+	/* Allocate buffer to hold IV and input scatterlist array */
+	ret = alloc_src_req_buf(nkreq, nents, ivsize);
+	if (ret)
+		return ret;
+
+	nitrox_creq_copy_iv(nkreq->src, iv, ivsize);
+	nitrox_creq_set_src_sg(nkreq, nents, ivsize, areq->src, buflen);
+
+	return 0;
+}
+
+static int alloc_dst_sglist(struct aead_request *areq, int ivsize, int buflen)
+{
+	struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);
+	int nents = sg_nents_for_len(areq->dst, buflen) + 3;
+	int ret;
+
+	if (nents < 0)
+		return nents;
+
+	/* Allocate buffer to hold ORH, COMPLETION and output scatterlist
+	 * array
+	 */
+	ret = alloc_dst_req_buf(nkreq, nents);
+	if (ret)
+		return ret;
+
+	nitrox_creq_set_orh(nkreq);
+	nitrox_creq_set_comp(nkreq);
+	nitrox_creq_set_dst_sg(nkreq, nents, ivsize, areq->dst, buflen);
+
+	return 0;
+}
+
+static void free_src_sglist(struct aead_request *areq)
+{
+	struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);
+
+	kfree(nkreq->src);
+}
+
+static void free_dst_sglist(struct aead_request *areq)
+{
+	struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);
+
+	kfree(nkreq->dst);
+}
+
+static int nitrox_set_creq(struct aead_request *areq,
+			   struct nitrox_crypt_params *params)
+{
+	struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);
+	struct se_crypto_request *creq = &nkreq->creq;
+	struct crypto_aead *aead = crypto_aead_reqtfm(areq);
+	union gph_p3 param3;
+	struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
+	int ret;
+
+	creq->flags = areq->base.flags;
+	creq->gfp = (areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
+		GFP_KERNEL : GFP_ATOMIC;
+
+	creq->ctrl.value = 0;
+	creq->opcode = FLEXI_CRYPTO_ENCRYPT_HMAC;
+	creq->ctrl.s.arg = params->ctrl_arg;
+
+	creq->gph.param0 = cpu_to_be16(params->cryptlen);
+	creq->gph.param1 = cpu_to_be16(params->authlen);
+	creq->gph.param2 = cpu_to_be16(params->ivsize + areq->assoclen);
+	param3.iv_offset = 0;
+	param3.auth_offset = params->ivsize;
+	creq->gph.param3 = cpu_to_be16(param3.param);
+
+	creq->ctx_handle = nctx->u.ctx_handle;
+	creq->ctrl.s.ctxl = sizeof(struct flexi_crypto_context);
+
+	ret = alloc_src_sglist(areq, params->iv, params->ivsize,
+			       params->srclen);
+	if (ret)
+		return ret;
+
+	ret = alloc_dst_sglist(areq, params->ivsize, params->dstlen);
+	if (ret) {
+		free_src_sglist(areq);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void nitrox_aead_callback(void *arg, int err)
+{
+	struct aead_request *areq = arg;
+
+	free_src_sglist(areq);
+	free_dst_sglist(areq);
+	if (err) {
+		pr_err_ratelimited("request failed status 0x%0x\n", err);
+		err = -EINVAL;
+	}
+
+	areq->base.complete(&areq->base, err);
+}
+
+static int nitrox_aes_gcm_enc(struct aead_request *areq)
+{
+	struct crypto_aead *aead = crypto_aead_reqtfm(areq);
+	struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
+	struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);
+	struct se_crypto_request *creq = &nkreq->creq;
+	struct flexi_crypto_context *fctx = nctx->u.fctx;
+	struct nitrox_crypt_params params;
+	int ret;
+
+	memcpy(fctx->crypto.iv, areq->iv, GCM_AES_SALT_SIZE);
+
+	memset(&params, 0, sizeof(params));
+	params.cryptlen = areq->cryptlen;
+	params.authlen = areq->assoclen + params.cryptlen;
+	params.srclen = params.authlen;
+	params.dstlen = params.srclen + aead->authsize;
+	params.iv = &areq->iv[GCM_AES_SALT_SIZE];
+	params.ivsize = GCM_AES_IV_SIZE - GCM_AES_SALT_SIZE;
+	params.ctrl_arg = ENCRYPT;
+	ret = nitrox_set_creq(areq, &params);
+	if (ret)
+		return ret;
+
+	/* send the crypto request */
+	return nitrox_process_se_request(nctx->ndev, creq, nitrox_aead_callback,
+					 areq);
+}
+
+static int nitrox_aes_gcm_dec(struct aead_request *areq)
+{
+	struct crypto_aead *aead = crypto_aead_reqtfm(areq);
+	struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
+	struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);
+	struct se_crypto_request *creq = &nkreq->creq;
+	struct flexi_crypto_context *fctx = nctx->u.fctx;
+	struct nitrox_crypt_params params;
+	int ret;
+
+	memcpy(fctx->crypto.iv, areq->iv, GCM_AES_SALT_SIZE);
+
+	memset(&params, 0, sizeof(params));
+	params.cryptlen = areq->cryptlen - aead->authsize;
+	params.authlen = areq->assoclen + params.cryptlen;
+	params.srclen = areq->cryptlen + areq->assoclen;
+	params.dstlen = params.srclen - aead->authsize;
+	params.iv = &areq->iv[GCM_AES_SALT_SIZE];
+	params.ivsize = GCM_AES_IV_SIZE - GCM_AES_SALT_SIZE;
+	params.ctrl_arg = DECRYPT;
+	ret = nitrox_set_creq(areq, &params);
+	if (ret)
+		return ret;
+
+	/* send the crypto request */
+	return nitrox_process_se_request(nctx->ndev, creq, nitrox_aead_callback,
+					 areq);
+}
+
+static int nitrox_aead_init(struct crypto_aead *aead)
+{
+	struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
+	struct crypto_ctx_hdr *chdr;
+
+	/* get the first device */
+	nctx->ndev = nitrox_get_first_device();
+	if (!nctx->ndev)
+		return -ENODEV;
+
+	/* allocate nitrox crypto context */
+	chdr = crypto_alloc_context(nctx->ndev);
+	if (!chdr) {
+		nitrox_put_device(nctx->ndev);
+		return -ENOMEM;
+	}
+	nctx->chdr = chdr;
+	nctx->u.ctx_handle = (uintptr_t)((u8 *)chdr->vaddr +
+					 sizeof(struct ctx_hdr));
+	nctx->u.fctx->flags.f = 0;
+
+	return 0;
+}
+
+static int nitrox_aes_gcm_init(struct crypto_aead *aead)
+{
+	int ret;
+	struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
+	union fc_ctx_flags *flags;
+
+	ret = nitrox_aead_init(aead);
+	if (ret)
+		return ret;
+
+	flags = &nctx->u.fctx->flags;
+	flags->w0.cipher_type = CIPHER_AES_GCM;
+	flags->w0.hash_type = AUTH_NULL;
+	flags->w0.iv_source = IV_FROM_DPTR;
+	/* ask microcode to calculate ipad/opad */
+	flags->w0.auth_input_type = 1;
+	flags->f = be64_to_cpu(flags->f);
+
+	crypto_aead_set_reqsize(aead, sizeof(struct aead_request) +
+				sizeof(struct nitrox_kcrypt_request));
+
+	return 0;
+}
+
+static void nitrox_aead_exit(struct crypto_aead *aead)
+{
+	struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
+
+	/* free the nitrox crypto context */
+	if (nctx->u.ctx_handle) {
+		struct flexi_crypto_context *fctx = nctx->u.fctx;
+
+		memzero_explicit(&fctx->crypto, sizeof(struct crypto_keys));
+		memzero_explicit(&fctx->auth, sizeof(struct auth_keys));
+		crypto_free_context((void *)nctx->chdr);
+	}
+	nitrox_put_device(nctx->ndev);
+
+	nctx->u.ctx_handle = 0;
+	nctx->ndev = NULL;
+}
+
+static struct aead_alg nitrox_aeads[] = { {
+	.base = {
+		.cra_name = "gcm(aes)",
+		.cra_driver_name = "n5_aes_gcm",
+		.cra_priority = PRIO,
+		.cra_flags = CRYPTO_ALG_ASYNC,
+		.cra_blocksize = AES_BLOCK_SIZE,
+		.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
+		.cra_alignmask = 0,
+		.cra_module = THIS_MODULE,
+	},
+	.setkey = nitrox_aes_gcm_setkey,
+	.setauthsize = nitrox_aead_setauthsize,
+	.encrypt = nitrox_aes_gcm_enc,
+	.decrypt = nitrox_aes_gcm_dec,
+	.init = nitrox_aes_gcm_init,
+	.exit = nitrox_aead_exit,
+	.ivsize = GCM_AES_IV_SIZE,
+	.maxauthsize = AES_BLOCK_SIZE,
+} };
+
+int nitrox_register_aeads(void)
+{
+	return crypto_register_aeads(nitrox_aeads, ARRAY_SIZE(nitrox_aeads));
+}
+
+void nitrox_unregister_aeads(void)
+{
+	crypto_unregister_aeads(nitrox_aeads, ARRAY_SIZE(nitrox_aeads));
+}