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nvme: send a rediscover uevent when a persistent discovery controller reconnects

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When a discovery controller is disconnected, no AENs will arrive to
notify the host about discovery log change events.

In order to solve this, send a uevent notification when a
persistent discovery controller reconnects. We add a new ctrl
flag NVME_CTRL_STARTED_ONCE that will be set on the first
start, and consecutive calls will find it set, and send the
event to userspace if the controller is a discovery controller.

Upon the event reception, userspace will re-read the discovery
log page and will act upon changes as it sees fit.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sagi Grimberg 2022-09-22 11:15:37 +03:00 committed by Christoph Hellwig
parent bf093d9716
commit f46ef9e87c
2 changed files with 11 additions and 0 deletions
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10
drivers/nvme/host/core.c
View file

@ -4815,6 +4815,16 @@ void nvme_start_ctrl(struct nvme_ctrl *ctrl)
nvme_enable_aen(ctrl);
/*
* persistent discovery controllers need to send indication to userspace
* to re-read the discovery log page to learn about possible changes
* that were missed. We identify persistent discovery controllers by
* checking that they started once before, hence are reconnecting back.
*/
if (test_and_set_bit(NVME_CTRL_STARTED_ONCE, &ctrl->flags) &&
nvme_discovery_ctrl(ctrl))
nvme_change_uevent(ctrl, "NVME_EVENT=rediscover");
if (ctrl->queue_count > 1) {
nvme_queue_scan(ctrl);
nvme_start_queues(ctrl);

1
drivers/nvme/host/nvme.h
View file

@ -236,6 +236,7 @@ struct nvme_fault_inject {
enum nvme_ctrl_flags {
NVME_CTRL_FAILFAST_EXPIRED = 0,
NVME_CTRL_ADMIN_Q_STOPPED = 1,
NVME_CTRL_STARTED_ONCE = 2,
};
struct nvme_ctrl {