linux-kernel - [PATCH rdma-next 8/8] net/rds: Move to client

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Message-Id: <20210405055000.215792-9-leon@kernel.org>
Date:   Mon,  5 Apr 2021 08:50:00 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     Parav Pandit <parav@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-s390@...r.kernel.org,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
        netdev@...r.kernel.org, rds-devel@....oracle.com,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>
Subject: [PATCH rdma-next 8/8] net/rds: Move to client_supported callback

From: Parav Pandit <parav@...dia.com>

Use newly introduced client_supported() callback to avoid client
additional if the RDMA device is not of IB type or if it doesn't
support device memory extensions.

Signed-off-by: Parav Pandit <parav@...dia.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 net/rds/ib.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/net/rds/ib.c b/net/rds/ib.c
index 24c9a9005a6f..bd2ff7d5a718 100644
--- a/net/rds/ib.c
+++ b/net/rds/ib.c
@@ -125,18 +125,23 @@ void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
 		queue_work(rds_wq, &rds_ibdev->free_work);
 }
 
-static int rds_ib_add_one(struct ib_device *device)
+static bool rds_client_supported(struct ib_device *device)
 {
-	struct rds_ib_device *rds_ibdev;
-	int ret;
-
 	/* Only handle IB (no iWARP) devices */
 	if (device->node_type != RDMA_NODE_IB_CA)
-		return -EOPNOTSUPP;
+		return false;
 
 	/* Device must support FRWR */
 	if (!(device->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
-		return -EOPNOTSUPP;
+		return false;
+
+	return true;
+}
+
+static int rds_ib_add_one(struct ib_device *device)
+{
+	struct rds_ib_device *rds_ibdev;
+	int ret;
 
 	rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
 				 ibdev_to_node(device));
@@ -288,7 +293,8 @@ static void rds_ib_remove_one(struct ib_device *device, void *client_data)
 struct ib_client rds_ib_client = {
 	.name   = "rds_ib",
 	.add    = rds_ib_add_one,
-	.remove = rds_ib_remove_one
+	.remove = rds_ib_remove_one,
+	.is_supported = rds_client_supported,
 };
 
 static int rds_ib_conn_info_visitor(struct rds_connection *conn,
-- 
2.30.2