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: Vakul Garg <vakul.garg@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 9 insertions, 1 deletions

diff --git a/include/net/tls.h b/include/net/tls.h
index 9185e53a743c..4913430ab807 100644
--- 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];
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 0a9b72fbd761..f26376e954ae 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -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;