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Commit a54667f6 authored by Vakul Garg's avatar Vakul Garg Committed by David S. Miller
Browse files

tls: Add support for encryption using async offload accelerator 



Async crypto accelerators (e.g. drivers/crypto/caam) support offloading
GCM operation. If they are enabled, crypto_aead_encrypt() return error
code -EINPROGRESS. In this case tls_do_encryption() needs to wait on a
completion till the time the response for crypto offload request is
received.

Signed-off-by: default avatarVakul Garg <vakul.garg@nxp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4adfa79f

include/net/tls.h

+2 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ 


#include <linux/types.h>

#include <asm/byteorder.h>

#include <linux/crypto.h>

#include <linux/socket.h>

#include <linux/tcp.h>

#include <net/tcp.h>
@@ -57,6 +58,7 @@ 


struct tls_sw_context {

	struct crypto_aead *aead_send;

	struct crypto_wait async_wait;



	/* Sending context */

	char aad_space[TLS_AAD_SPACE_SIZE];

net/tls/tls_sw.c

+7 −1
Original line number Diff line number Diff line
@@ -214,7 +214,11 @@ static int tls_do_encryption(struct tls_context *tls_ctx, 
	aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE);

	aead_request_set_crypt(aead_req, ctx->sg_aead_in, ctx->sg_aead_out,

			       data_len, tls_ctx->iv);

	rc = crypto_aead_encrypt(aead_req);



	aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,

				  crypto_req_done, &ctx->async_wait);



	rc = crypto_wait_req(crypto_aead_encrypt(aead_req), &ctx->async_wait);



	ctx->sg_encrypted_data[0].offset -= tls_ctx->prepend_size;

	ctx->sg_encrypted_data[0].length += tls_ctx->prepend_size;
@@ -665,6 +669,8 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx) 
		goto out;

	}



	crypto_init_wait(&sw_ctx->async_wait);



	ctx->priv_ctx = (struct tls_offload_context *)sw_ctx;



	crypto_info = &ctx->crypto_send;