If port_guid is set with the default subnet_prefix, then we get a change
event and run a port refresh, we don't update the port_guid. As a
result, attempts to create a target device that uses the new
subnet_prefix in the wwn will fail to find a match and be rejected by
the ib_srpt driver. This makes it impossible to configure a port if it
was initialized with a default subnet_prefix and later changed to any
non-default subnet-prefix. Updating the port refresh task to always
update the wwn based upon the current subnext_prefix solves this
problem.
Cc: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Cc: nab@xxxxxxxxxxxxxxx
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
---
Bart, Nicholas;
This doesn't entirely resolve the problem I'm seeing here. It only fixes
one part of it, the ability to set the config once the right subnet_prefix
is known. There still is the problem of a race condition between the
attempt to configure the target subsystem and the subnet_prefix becoming
known. It seems what is needed is the ability to enter srpt configuration
even if it doesn't match any known WWNs at the moment, and on a port
refresh, if the WWN changes, we should drop the current config and reload
any other config that the new WWN matches. But I have no idea how to make
this happen in the target core. The other option would be to have a
user space dispatcher that reloaded the target config on subnet_prefix
changes, but the lio code would need modified to be able to restrict
the reload to a specific interface or else if the user had changed the
config on another port, then a subnet_prefix change occurred, the
lio code might wipe out the user's custom changes.
---
drivers/infiniband/ulp/srpt/ib_srpt.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index dfa23b075a88..883bbfe08e0e 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -522,6 +522,11 @@ static int srpt_refresh_port(struct srpt_port *sport)
if (ret)
goto err_query_port;
+ snprintf(sport->port_guid, sizeof(sport->port_guid),
+ "0x%016llx%016llx",
+ be64_to_cpu(sport->gid.global.subnet_prefix),
+ be64_to_cpu(sport->gid.global.interface_id));
+
if (!sport->mad_agent) {
memset(®_req, 0, sizeof(reg_req));
reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
@@ -2548,10 +2553,6 @@ static void srpt_add_one(struct ib_device *device)
sdev->device->name, i);
goto err_ring;
}
- snprintf(sport->port_guid, sizeof(sport->port_guid),
- "0x%016llx%016llx",
- be64_to_cpu(sport->gid.global.subnet_prefix),
- be64_to_cpu(sport->gid.global.interface_id));
}
spin_lock(&srpt_dev_lock);
--
2.7.4
--
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