netdev - [RFC-PATCH] caif: Add debug connection type for CAIF.

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Date:	Sat, 08 May 2010 09:23:04 +0200
From:	sjur.brandeland@...ricsson.com
To:	netdev@...r.kernel.org
Cc:	marcel@...tmann.org, sjurbr@...il.com,
	Sjur Braendeland <sjur.brandeland@...ricsson.com>
Subject: [RFC-PATCH] caif: Add debug connection type for CAIF.

From: Sjur Braendeland <sjur.brandeland@...ricsson.com>

Added new CAIF protocol type CAIFPROTO_DEBUG for accessing
CAIF debug on the ST Ericsson modems.

There are two debug servers on the modem, one for radio related
debug (CAIF_RADIO_DEBUG_SERVICE) and the other for
communication/application related debug (CAIF_COM_DEBUG_SERVICE).

The debug connection can contain trace debug printouts or
interactive debug used for debugging and test.

Debug connections can be of type STREAM or SEQPACKET.

Feedback is welcomed.
---
 include/linux/caif/caif_socket.h |   36 ++++++++++++++++++++++++++++++++++++
 net/caif/caif_config_util.c      |    5 +++++
 net/caif/caif_socket.c           |    5 -----
 3 files changed, 41 insertions(+), 5 deletions(-)

diff --git a/include/linux/caif/caif_socket.h b/include/linux/caif/caif_socket.h
index 2a61eb1..1a8fd1f 100644
--- a/include/linux/caif/caif_socket.h
+++ b/include/linux/caif/caif_socket.h
@@ -62,6 +62,7 @@ enum caif_channel_priority {
  * @CAIFPROTO_DATAGRAM_LOOP:	Datagram loopback channel, used for testing.
  * @CAIFPROTO_UTIL:		Utility (Psock) channel.
  * @CAIFPROTO_RFM:		Remote File Manager
+ * @CAIFPROTO_DEBUG:		Debug link
  *
  * This enum defines the CAIF Channel type to be used. This defines
  * the service to connect to on the modem.
@@ -72,6 +73,7 @@ enum caif_protocol_type {
 	CAIFPROTO_DATAGRAM_LOOP,
 	CAIFPROTO_UTIL,
 	CAIFPROTO_RFM,
+	CAIFPROTO_DEBUG,
 	_CAIFPROTO_MAX
 };
 #define	CAIFPROTO_MAX _CAIFPROTO_MAX
@@ -85,6 +87,29 @@ enum caif_at_type {
 };
 
 /**
+ * enum caif_debug_type - Content selection for debug connection
+ * @CAIF_DEBUG_TRACE_INTERACTIVE: Connection will contain
+ *				both trace and interactive debug.
+ * @CAIF_DEBUG_TRACE:		Connection contains trace only.
+ * @CAIF_DEBUG_INTERACTIVE:	Connection to interactive debug.
+ */
+enum caif_debug_type {
+	CAIF_DEBUG_TRACE_INTERACTIVE = 0,
+	CAIF_DEBUG_TRACE,
+	CAIF_DEBUG_INTERACTIVE,
+};
+
+/**
+ * enum caif_debug_service - Debug Service to connect.
+ * @CAIF_RADIO_DEBUG_SERVICE:	Debug on the Radio sub-system
+ * @CAIF_COM_DEBUG_SERVICE:	Debug on the communication sub-system
+ */
+enum caif_debug_service {
+	CAIF_RADIO_DEBUG_SERVICE = 1,
+	CAIF_COM_DEBUG_SERVICE
+};
+
+/**
  * struct sockaddr_caif - the sockaddr structure for CAIF sockets.
  * @family:		     Address family number, must be AF_CAIF.
  * @u:			     Union of address data 'switched' by family.
@@ -109,6 +134,13 @@ enum caif_at_type {
  *
  * @u.rfm.volume:            Volume to mount.
  *
+ * @u.dbg:                    Applies when family = CAIFPROTO_DEBUG.
+ *
+ * @u.dbg.type:		      Type of debug connection to set up
+ *			       (caif_debug_type).
+ *
+ * @u.dbg.service:            Service sub-system to connect (caif_debug_service)
+ *
  * Description:
  * This structure holds the connect parameters used for setting up a
  * CAIF Channel. It defines the service to connect to on the modem.
@@ -130,6 +162,10 @@ struct sockaddr_caif {
 			__u32 connection_id;
 			char	  volume[16];
 		} rfm;				/* CAIFPROTO_RFM */
+		struct {
+			__u8  type;		/* type:enum caif_debug_type */
+			__u8  service;		/* service:caif_debug_service */
+		} dbg;				/* CAIFPROTO_DEBUG */
 	} u;
 };
 
diff --git a/net/caif/caif_config_util.c b/net/caif/caif_config_util.c
index 6f36580..76ae683 100644
--- a/net/caif/caif_config_util.c
+++ b/net/caif/caif_config_util.c
@@ -80,6 +80,11 @@ int connect_req_to_link_param(struct cfcnfg *cnfg,
 		       l->u.utility.paramlen);
 
 		break;
+	case CAIFPROTO_DEBUG:
+		l->linktype = CFCTRL_SRV_DBG;
+		l->endpoint = s->sockaddr.u.dbg.service;
+		l->chtype = s->sockaddr.u.dbg.type;
+		break;
 	default:
 		return -EINVAL;
 	}
diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c
index c3a70c5..4e6c610 100644
--- a/net/caif/caif_socket.c
+++ b/net/caif/caif_socket.c
@@ -843,11 +843,6 @@ static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
 	if (uaddr->sa_family != AF_CAIF)
 		goto out;
 
-	err = -ESOCKTNOSUPPORT;
-	if (unlikely(!(sk->sk_type == SOCK_STREAM &&
-		       cf_sk->sk.sk_protocol == CAIFPROTO_AT) &&
-		       sk->sk_type != SOCK_SEQPACKET))
-		goto out;
 	switch (sock->state) {
 	case SS_UNCONNECTED:
 		/* Normal case, a fresh connect */
-- 
1.6.3.3

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