From: Vakul Garg <vakul.garg@nxp.com>
Date: Wed, 31 Jan 2018 21:34:37 +0530
Subject: tls: Add support for encryption using async offload accelerator
Patch-mainline: v4.16-rc1
Git-commit: a54667f6728c2714a400f3c884727da74b6d1717
References: bsc#1103990 FATE#326006
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: Vakul Garg <vakul.garg@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
include/net/tls.h | 2 ++
net/tls/tls_sw.c | 8 +++++++-
2 files changed, 9 insertions(+), 1 deletion(-)
--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -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];
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -214,7 +214,11 @@ static int tls_do_encryption(struct tls_
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,
goto out;
}
+ crypto_init_wait(&sw_ctx->async_wait);
+
ctx->priv_ctx = (struct tls_offload_context *)sw_ctx;
crypto_info = &ctx->crypto_send;