dibs: Move query_remote_gid() to dibs_dev_ops

Provide the dibs_dev_ops->query_remote_gid() in ism and dibs_loopback
dibs_devices. And call it in smc dibs_client.

Reviewed-by: Julian Ruess <julianr@linux.ibm.com>
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Link: https://patch.msgid.link/20250918110500.1731261-13-wintera@linux.ibm.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/dibs/dibs_loopback.c

@@ -24,8 +24,18 @@ static u16 dibs_lo_get_fabric_id(struct dibs_dev *dibs)
 	return DIBS_LOOPBACK_FABRIC;
 }
 
+static int dibs_lo_query_rgid(struct dibs_dev *dibs, const uuid_t *rgid,
+			      u32 vid_valid, u32 vid)
+{
+	/* rgid should be the same as lgid */
+	if (!uuid_equal(rgid, &dibs->gid))
+		return -ENETUNREACH;
+	return 0;
+}
+
 static const struct dibs_dev_ops dibs_lo_ops = {
 	.get_fabric_id = dibs_lo_get_fabric_id,
+	.query_remote_gid = dibs_lo_query_rgid,
 };
 
 static int dibs_lo_dev_probe(void)

drivers/s390/net/ism_drv.c

@@ -291,6 +291,23 @@ static int ism_read_local_gid(struct dibs_dev *dibs)
 	return ret;
 }
 
+static int ism_query_rgid(struct dibs_dev *dibs, const uuid_t *rgid,
+			  u32 vid_valid, u32 vid)
+{
+	struct ism_dev *ism = dibs->drv_priv;
+	union ism_query_rgid cmd;
+
+	memset(&cmd, 0, sizeof(cmd));
+	cmd.request.hdr.cmd = ISM_QUERY_RGID;
+	cmd.request.hdr.len = sizeof(cmd.request);
+
+	memcpy(&cmd.request.rgid, rgid, sizeof(cmd.request.rgid));
+	cmd.request.vlan_valid = vid_valid;
+	cmd.request.vlan_id = vid;
+
+	return ism_cmd(ism, &cmd);
+}
+
 static void ism_free_dmb(struct ism_dev *ism, struct ism_dmb *dmb)
 {
 	clear_bit(dmb->sba_idx, ism->sba_bitmap);
@@ -537,6 +554,7 @@ static irqreturn_t ism_handle_irq(int irq, void *data)
 
 static const struct dibs_dev_ops ism_ops = {
 	.get_fabric_id = ism_get_chid,
+	.query_remote_gid = ism_query_rgid,
 	.add_vlan_id = ism_add_vlan_id,
 	.del_vlan_id = ism_del_vlan_id,
 };
@@ -748,28 +766,6 @@ module_exit(ism_exit);
 /*************************** SMC-D Implementation *****************************/
 
 #if IS_ENABLED(CONFIG_SMC)
-static int ism_query_rgid(struct ism_dev *ism, u64 rgid, u32 vid_valid,
-			  u32 vid)
-{
-	union ism_query_rgid cmd;
-
-	memset(&cmd, 0, sizeof(cmd));
-	cmd.request.hdr.cmd = ISM_QUERY_RGID;
-	cmd.request.hdr.len = sizeof(cmd.request);
-
-	cmd.request.rgid = rgid;
-	cmd.request.vlan_valid = vid_valid;
-	cmd.request.vlan_id = vid;
-
-	return ism_cmd(ism, &cmd);
-}
-
-static int smcd_query_rgid(struct smcd_dev *smcd, struct smcd_gid *rgid,
-			   u32 vid_valid, u32 vid)
-{
-	return ism_query_rgid(smcd->priv, rgid->gid, vid_valid, vid);
-}
-
 static int smcd_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
 			     void *client)
 {
@@ -813,7 +809,6 @@ static int smcd_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx,
 }
 
 static const struct smcd_ops ism_smcd_ops = {
-	.query_remote_gid = smcd_query_rgid,
 	.register_dmb = smcd_register_dmb,
 	.unregister_dmb = smcd_unregister_dmb,
 	.signal_event = smcd_signal_ieq,

include/linux/dibs.h

@@ -133,6 +133,20 @@ struct dibs_dev_ops {
 	 * Return: 2 byte dibs fabric id
 	 */
 	u16 (*get_fabric_id)(struct dibs_dev *dev);
+	/**
+	 * query_remote_gid()
+	 * @dev: local dibs device
+	 * @rgid: gid of remote dibs device
+	 * @vid_valid: if zero, vid will be ignored;
+	 *	       deprecated, ignored if device does not support vlan
+	 * @vid: VLAN id; deprecated, ignored if device does not support vlan
+	 *
+	 * Query whether a remote dibs device is reachable via this local device
+	 * and this vlan id.
+	 * Return: 0 if remote gid is reachable.
+	 */
+	int (*query_remote_gid)(struct dibs_dev *dev, const uuid_t *rgid,
+				u32 vid_valid, u32 vid);
 	/**
 	 * add_vlan_id() - add dibs device to vlan (optional, deprecated)
 	 * @dev: dibs device

include/net/smc.h

@@ -53,8 +53,6 @@ struct smcd_gid {
 };
 
 struct smcd_ops {
-	int (*query_remote_gid)(struct smcd_dev *dev, struct smcd_gid *rgid,
-				u32 vid_valid, u32 vid);
 	int (*register_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb,
 			    void *client);
 	int (*unregister_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);

net/smc/smc_ism.c

@@ -77,8 +77,12 @@ static void smc_ism_create_system_eid(void)
 int smc_ism_cantalk(struct smcd_gid *peer_gid, unsigned short vlan_id,
 		    struct smcd_dev *smcd)
 {
-	return smcd->ops->query_remote_gid(smcd, peer_gid, vlan_id ? 1 : 0,
-					   vlan_id);
+	struct dibs_dev *dibs = smcd->dibs;
+	uuid_t ism_rgid;
+
+	copy_to_dibsgid(&ism_rgid, peer_gid);
+	return dibs->ops->query_remote_gid(dibs, &ism_rgid, vlan_id ? 1 : 0,
+					  vlan_id);
 }
 
 void smc_ism_get_system_eid(u8 **eid)

net/smc/smc_loopback.c

@@ -25,18 +25,6 @@
 
 static struct smc_lo_dev *lo_dev;
 
-static int smc_lo_query_rgid(struct smcd_dev *smcd, struct smcd_gid *rgid,
-			     u32 vid_valid, u32 vid)
-{
-	uuid_t temp;
-
-	copy_to_dibsgid(&temp, rgid);
-	/* rgid should be the same as lgid */
-	if (!uuid_equal(&temp, &smcd->dibs->gid))
-		return -ENETUNREACH;
-	return 0;
-}
-
 static int smc_lo_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
 			       void *client_priv)
 {
@@ -235,7 +223,6 @@ static int smc_lo_move_data(struct smcd_dev *smcd, u64 dmb_tok,
 }
 
 static const struct smcd_ops lo_ops = {
-	.query_remote_gid = smc_lo_query_rgid,
 	.register_dmb = smc_lo_register_dmb,
 	.unregister_dmb = smc_lo_unregister_dmb,
 	.support_dmb_nocopy = smc_lo_support_dmb_nocopy,