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nvme-fabrics: Ignore nr_io_queues option for discovery controllers 

This removes a dependency on the order options are passed when creating
a fabrics controller.  With the old code, if "nr_io_queues" appears before
an "nqn" option specifying the discovery controller, then nr_io_queues
is overridden with zero.  If "nr_io_queues" appears after specifying the
discovery controller, then the nr_io_queues option is used to set the
number of queues, and the driver attempts to establish IO connections
to the discovery controller (which doesn't work).

It seems better to ignore (and warn about) the "nr_io_queues" option
if userspace has already asked to connect to the discovery controller.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Reviewed-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <keith.busch@intel.com>
This commit is contained in:
Roland Dreier 2018-03-05 11:59:53 -08:00 committed by Keith Busch
parent 8a30ecc6e0
commit 0475821e22
1 changed files with 5 additions and 0 deletions
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5
drivers/nvme/host/fabrics.c
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@ -650,6 +650,11 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
ret = -EINVAL;
goto out;
}
if (opts->discovery_nqn) {
pr_debug("Ignoring nr_io_queues value for discovery controller\n");
break;
}
opts->nr_io_queues = min_t(unsigned int,
num_online_cpus(), token);
break;