Merge pull request #14926 from akshaim/Kconfig_dtls

net/sock/dtls :  Expose configuration to Kconfig

sys/include/net/sock/dtls.h

@@ -491,13 +491,35 @@
 extern "C" {
 #endif
 
+/**
+ * @defgroup net_sock_dtls_conf    SOCK DTLS compile configuration
+ * @ingroup  net_sock_conf
+ * @{
+ */
+/**
+ * @brief   Default buffer size for DTLS handshake (as exponent of 2^n)
+ *
+ * As the buffer size ALWAYS needs to be power of two, this option represents
+ * the exponent of 2^n, which will be used as the size of the buffer
+ * ( @ref DTLS_HANDSHAKE_BUFSIZE ).
+ *
+ */
+#ifndef CONFIG_DTLS_HANDSHAKE_BUFSIZE_EXP
+#define CONFIG_DTLS_HANDSHAKE_BUFSIZE_EXP  8
+#endif
+/** @} */
+
+/**
+ * @brief   Size buffer used in handshake to hold credentials
+ */
 #ifndef DTLS_HANDSHAKE_BUFSIZE
-#define DTLS_HANDSHAKE_BUFSIZE  (256)   /**< Size buffer used in handshake to
-                                             hold credentials */
+#define DTLS_HANDSHAKE_BUFSIZE  (1 << CONFIG_DTLS_HANDSHAKE_BUFSIZE_EXP)
 #endif
 
-#define SOCK_DTLS_HANDSHAKE     (EXDEV) /**< Return value for a successful
-                                             handshake */
+/**
+ * @brief   Return value for a successful handshake
+ */
+#define SOCK_DTLS_HANDSHAKE     (EXDEV)
 
 /**
  * @brief DTLS version number

sys/include/net/sock/util.h

@@ -206,11 +206,9 @@ static inline bool sock_udp_ep_equal(const sock_udp_ep_t *a,
 
 /**
  * @defgroup    net_sock_util_conf SOCK utility functions compile configurations
- * @ingroup     net_sock_util
- * @ingroup     config
+ * @ingroup     net_sock_conf
  * @{
  */
-
 /**
  * @brief maximum length of the scheme part for sock_urlsplit.
  *
@@ -233,7 +231,6 @@ static inline bool sock_udp_ep_equal(const sock_udp_ep_t *a,
 #ifndef CONFIG_SOCK_URLPATH_MAXLEN
 #define CONFIG_SOCK_URLPATH_MAXLEN     (64U)
 #endif
-
 /** @} */
 
 #ifdef __cplusplus

sys/net/sock/Kconfig

@@ -29,3 +29,19 @@ config SOCK_URLPATH_MAXLEN
         This value is used in sock_urlsplit().
 
 endif # KCONFIG_USEMODULE_SOCK_UTIL
+
+menuconfig KCONFIG_USEMODULE_SOCK_DTLS
+    bool "Configure SOCK DTLS"
+    depends on USEMODULE_SOCK_DTLS
+
+if KCONFIG_USEMODULE_SOCK_DTLS
+
+config DTLS_HANDSHAKE_BUFSIZE_EXP
+    int "Exponent for the DTLS buffer size (resulting in the buffer size 2^n)"
+    default 8
+    help
+        As the buffer size ALWAYS needs to be power of two, this option
+        represents the exponent of 2^n, which will be used as the size of the
+        buffer. The buffer is used to hold credentials during DTLS handshakes.
+
+endif # KCONFIG_USEMODULE_SOCK_DTLS

sys/net/sock/doc.txt

@@ -0,0 +1,11 @@
+# Copyright (c) 2020 Freie Universitaet Berlin
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+#
+/**
+ * @defgroup    net_sock_conf SOCK compile configurations
+ * @ingroup     config
+ * @brief       Group of compile time configurations related to SOCK
+ */