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nvme-fabrics: allow discovery subsystems accept a kato 

This modifies the behavior of discovery subsystems to accept
a kato as a preparation to support discovery log change
events. This also means that now every discovery controller
will have a default kato value, and for non-persistent connections
the host needs to pass in a zero kato value (keep_alive_tmo=0).

Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>
Reviewed-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Sagi Grimberg 2019-07-12 11:02:09 -07:00
parent 1179d337be
commit 2d352df57b
1 changed files with 2 additions and 10 deletions
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12
drivers/nvme/host/fabrics.c
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@ -381,8 +381,8 @@ int nvmf_connect_admin_queue(struct nvme_ctrl *ctrl)
* Set keep-alive timeout in seconds granularity (ms * 1000)
* and add a grace period for controller kato enforcement
*/
cmd.connect.kato = ctrl->opts->discovery_nqn ? 0 :
cpu_to_le32((ctrl->kato + NVME_KATO_GRACE) * 1000);
cmd.connect.kato = ctrl->kato ?
cpu_to_le32((ctrl->kato + NVME_KATO_GRACE) * 1000) : 0;
if (ctrl->opts->disable_sqflow)
cmd.connect.cattr |= NVME_CONNECT_DISABLE_SQFLOW;
@ -740,13 +740,6 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
pr_warn("keep_alive_tmo 0 won't execute keep alives!!!\n");
}
opts->kato = token;
if (opts->discovery_nqn && opts->kato) {
pr_err("Discovery controllers cannot accept KATO != 0\n");
ret = -EINVAL;
goto out;
}
break;
case NVMF_OPT_CTRL_LOSS_TMO:
if (match_int(args, &token)) {
@ -883,7 +876,6 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
}
if (opts->discovery_nqn) {
opts->kato = 0;
opts->nr_io_queues = 0;
opts->nr_write_queues = 0;
opts->nr_poll_queues = 0;