caif: Bugfix for socket priority, bindtodev and dbg channel.

Changes:
o Bugfix: SO_PRIORITY for SOL_SOCKET could not be handled
  in caif's setsockopt,  using the struct sock attribute priority instead.

o Bugfix: SO_BINDTODEVICE for SOL_SOCKET could not be handled
  in caif's setsockopt,  using the struct sock attribute ifindex instead.

o Wrong assert statement for RFM layer segmentation.

o CAIF Debug channels was not working over SPI, caif_payload_info
  containing padding info must be initialized.

o Check on pointer before dereferencing when unregister dev in caif_dev.c

Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/caif/caif_dev.h

@@ -28,7 +28,7 @@ struct caif_param {
  * @sockaddr:		Socket address to connect.
  * @priority:		Priority of the connection.
  * @link_selector:	Link selector (high bandwidth or low latency)
- * @link_name:		Name of the CAIF Link Layer to use.
+ * @ifindex:		kernel index of the interface.
  * @param:		Connect Request parameters (CAIF_SO_REQ_PARAM).
  *
  * This struct is used when connecting a CAIF channel.
@@ -39,7 +39,7 @@ struct caif_connect_request {
 	struct sockaddr_caif sockaddr;
 	enum caif_channel_priority priority;
 	enum caif_link_selector link_selector;
-	char link_name[16];
+	int ifindex;
 	struct caif_param param;
 };
 

include/net/caif/cfcnfg.h

@@ -139,10 +139,10 @@ struct dev_info *cfcnfg_get_phyid(struct cfcnfg *cnfg,
 		     enum cfcnfg_phy_preference phy_pref);
 
 /**
- * cfcnfg_get_named() - Get the Physical Identifier of CAIF Link Layer
+ * cfcnfg_get_id_from_ifi() - Get the Physical Identifier of ifindex,
+ * 			it matches caif physical id with the kernel interface id.
  * @cnfg:	Configuration object
- * @name:	Name of the Physical Layer (Caif Link Layer)
+ * @ifi:	ifindex obtained from socket.c bindtodevice.
  */
-int cfcnfg_get_named(struct cfcnfg *cnfg, char *name);
-
+int cfcnfg_get_id_from_ifi(struct cfcnfg *cnfg, int ifi);
 #endif				/* CFCNFG_H_ */

net/caif/caif_config_util.c

@@ -16,11 +16,18 @@ int connect_req_to_link_param(struct cfcnfg *cnfg,
 {
 	struct dev_info *dev_info;
 	enum cfcnfg_phy_preference pref;
+	int res;
+
 	memset(l, 0, sizeof(*l));
-	l->priority = s->priority;
+	/* In caif protocol low value is high priority */
+	l->priority = CAIF_PRIO_MAX - s->priority + 1;
 
-	if (s->link_name[0] != '\0')
-		l->phyid = cfcnfg_get_named(cnfg, s->link_name);
+	if (s->ifindex != 0){
+		res = cfcnfg_get_id_from_ifi(cnfg, s->ifindex);
+		if (res < 0)
+			return res;
+		l->phyid = res;
+	}
 	else {
 		switch (s->link_selector) {
 		case CAIF_LINK_HIGH_BANDW:

net/caif/caif_dev.c

@@ -307,6 +307,8 @@ static int caif_device_notify(struct notifier_block *me, unsigned long what,
 
 	case NETDEV_UNREGISTER:
 		caifd = caif_get(dev);
+		if (caifd == NULL)
+			break;
 		netdev_info(dev, "unregister\n");
 		atomic_set(&caifd->state, what);
 		caif_device_destroy(dev);

net/caif/caif_socket.c

@@ -716,8 +716,7 @@ static int setsockopt(struct socket *sock,
 {
 	struct sock *sk = sock->sk;
 	struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
-	int prio, linksel;
-	struct ifreq ifreq;
+	int linksel;
 
 	if (cf_sk->sk.sk_socket->state != SS_UNCONNECTED)
 		return -ENOPROTOOPT;
@@ -735,33 +734,6 @@ static int setsockopt(struct socket *sock,
 		release_sock(&cf_sk->sk);
 		return 0;
 
-	case SO_PRIORITY:
-		if (lvl != SOL_SOCKET)
-			goto bad_sol;
-		if (ol < sizeof(int))
-			return -EINVAL;
-		if (copy_from_user(&prio, ov, sizeof(int)))
-			return -EINVAL;
-		lock_sock(&(cf_sk->sk));
-		cf_sk->conn_req.priority = prio;
-		release_sock(&cf_sk->sk);
-		return 0;
-
-	case SO_BINDTODEVICE:
-		if (lvl != SOL_SOCKET)
-			goto bad_sol;
-		if (ol < sizeof(struct ifreq))
-			return -EINVAL;
-		if (copy_from_user(&ifreq, ov, sizeof(ifreq)))
-			return -EFAULT;
-		lock_sock(&(cf_sk->sk));
-		strncpy(cf_sk->conn_req.link_name, ifreq.ifr_name,
-			sizeof(cf_sk->conn_req.link_name));
-		cf_sk->conn_req.link_name
-			[sizeof(cf_sk->conn_req.link_name)-1] = 0;
-		release_sock(&cf_sk->sk);
-		return 0;
-
 	case CAIFSO_REQ_PARAM:
 		if (lvl != SOL_CAIF)
 			goto bad_sol;
@@ -880,6 +852,18 @@ static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
 	sock->state = SS_CONNECTING;
 	sk->sk_state = CAIF_CONNECTING;
 
+	/* Check priority value comming from socket */
+	/* if priority value is out of range it will be ajusted */
+	if (cf_sk->sk.sk_priority > CAIF_PRIO_MAX)
+		cf_sk->conn_req.priority = CAIF_PRIO_MAX;
+	else if (cf_sk->sk.sk_priority < CAIF_PRIO_MIN)
+		cf_sk->conn_req.priority = CAIF_PRIO_MIN;
+	else
+		cf_sk->conn_req.priority = cf_sk->sk.sk_priority;
+
+	/*ifindex = id of the interface.*/
+	cf_sk->conn_req.ifindex = cf_sk->sk.sk_bound_dev_if;
+
 	dbfs_atomic_inc(&cnt.num_connect_req);
 	cf_sk->layer.receive = caif_sktrecv_cb;
 	err = caif_connect_client(&cf_sk->conn_req,
@@ -905,6 +889,7 @@ static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
 	cf_sk->maxframe = mtu - (headroom + tailroom);
 	if (cf_sk->maxframe < 1) {
 		pr_warn("CAIF Interface MTU too small (%d)\n", dev->mtu);
+		err = -ENODEV;
 		goto out;
 	}
 
@@ -1142,7 +1127,7 @@ static int caif_create(struct net *net, struct socket *sock, int protocol,
 	set_rx_flow_on(cf_sk);
 
 	/* Set default options on configuration */
-	cf_sk->conn_req.priority = CAIF_PRIO_NORMAL;
+	cf_sk->sk.sk_priority= CAIF_PRIO_NORMAL;
 	cf_sk->conn_req.link_selector = CAIF_LINK_LOW_LATENCY;
 	cf_sk->conn_req.protocol = protocol;
 	/* Increase the number of sockets created. */

net/caif/cfcnfg.c

@@ -173,18 +173,15 @@ static struct cfcnfg_phyinfo *cfcnfg_get_phyinfo(struct cfcnfg *cnfg,
 	return NULL;
 }
 
-int cfcnfg_get_named(struct cfcnfg *cnfg, char *name)
+
+int cfcnfg_get_id_from_ifi(struct cfcnfg *cnfg, int ifi)
 {
 	int i;
-
-	/* Try to match with specified name */
-	for (i = 0; i < MAX_PHY_LAYERS; i++) {
-		if (cnfg->phy_layers[i].frm_layer != NULL
-		    && strcmp(cnfg->phy_layers[i].phy_layer->name,
-			      name) == 0)
-			return cnfg->phy_layers[i].frm_layer->id;
-	}
-	return 0;
+	for (i = 0; i < MAX_PHY_LAYERS; i++)
+		if (cnfg->phy_layers[i].frm_layer != NULL &&
+				cnfg->phy_layers[i].ifindex == ifi)
+			return i;
+	return -ENODEV;
 }
 
 int cfcnfg_disconn_adapt_layer(struct cfcnfg *cnfg, struct cflayer *adap_layer)

net/caif/cfdbgl.c

@@ -12,6 +12,8 @@
 #include <net/caif/cfsrvl.h>
 #include <net/caif/cfpkt.h>
 
+#define container_obj(layr) ((struct cfsrvl *) layr)
+
 static int cfdbgl_receive(struct cflayer *layr, struct cfpkt *pkt);
 static int cfdbgl_transmit(struct cflayer *layr, struct cfpkt *pkt);
 
@@ -38,5 +40,17 @@ static int cfdbgl_receive(struct cflayer *layr, struct cfpkt *pkt)
 
 static int cfdbgl_transmit(struct cflayer *layr, struct cfpkt *pkt)
 {
+	struct cfsrvl *service = container_obj(layr);
+	struct caif_payload_info *info;
+	int ret;
+
+	if (!cfsrvl_ready(service, &ret))
+		return ret;
+
+	/* Add info for MUX-layer to route the packet out */
+	info = cfpkt_info(pkt);
+	info->channel_id = service->layer.id;
+	info->dev_info = &service->dev_info;
+
 	return layr->dn->transmit(layr->dn, pkt);
 }

net/caif/cfrfml.c

@@ -193,7 +193,7 @@ out:
 
 static int cfrfml_transmit_segment(struct cfrfml *rfml, struct cfpkt *pkt)
 {
-	caif_assert(cfpkt_getlen(pkt) >= rfml->fragment_size);
+	caif_assert(cfpkt_getlen(pkt) < rfml->fragment_size);
 
 	/* Add info for MUX-layer to route the packet out. */
 	cfpkt_info(pkt)->channel_id = rfml->serv.layer.id;