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Subject[PATCH 5.4 240/434] RDMA/core: Fix return code when modify_port isnt supported
Date
From: Kamal Heib <kamalheib1@gmail.com>

[ Upstream commit 55bfe905fa97633438c13fb029aed85371d85480 ]

Improve return code from ib_modify_port() by doing the following:
- Use "-EOPNOTSUPP" instead "-ENOSYS" which is the proper return code

- Allow only fake IB_PORT_CM_SUP manipulation for RoCE providers that
didn't implement the modify_port callback, otherwise return
"-EOPNOTSUPP"

Fixes: 61e0962d5221 ("IB: Avoid ib_modify_port() failure for RoCE devices")
Link: https://lore.kernel.org/r/20191028155931.1114-2-kamalheib1@gmail.com
Signed-off-by: Kamal Heib <kamalheib1@gmail.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/infiniband/core/device.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index e6327d8f5b79..2b5bd7206fc6 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -2409,8 +2409,12 @@ int ib_modify_port(struct ib_device *device,
rc = device->ops.modify_port(device, port_num,
port_modify_mask,
port_modify);
+ else if (rdma_protocol_roce(device, port_num) &&
+ ((port_modify->set_port_cap_mask & ~IB_PORT_CM_SUP) == 0 ||
+ (port_modify->clr_port_cap_mask & ~IB_PORT_CM_SUP) == 0))
+ rc = 0;
else
- rc = rdma_protocol_roce(device, port_num) ? 0 : -ENOSYS;
+ rc = -EOPNOTSUPP;
return rc;
}
EXPORT_SYMBOL(ib_modify_port);
--
2.20.1


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