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nvme-fcloop: add support for nvmet discovery_event op 

Update fcloop to support the discovery_event operation and
invoke a nvme rescan. In a real fc adapter, this would generate an
RSCN, which the host would receive and convert into a nvme rescan
on the remote port specified in the rscn payload.

Signed-off-by: James Smart <jsmart2021@gmail.com>
[kbuild-bot: fcloop_tgt_discovery_evt can be static]
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
James Smart 2019-05-14 14:58:04 -07:00 committed by Christoph Hellwig
parent 150d71f725
commit 4cf7c363b4
1 changed files with 37 additions and 0 deletions
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37
drivers/nvme/target/fcloop.c
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@ -231,6 +231,11 @@ struct fcloop_lsreq {
int status;
};
struct fcloop_rscn {
struct fcloop_tport *tport;
struct work_struct work;
};
enum {
INI_IO_START = 0,
INI_IO_ACTIVE = 1,
@ -348,6 +353,37 @@ fcloop_xmt_ls_rsp(struct nvmet_fc_target_port *tport,
return 0;
}
/*
* Simulate reception of RSCN and converting it to a initiator transport
* call to rescan a remote port.
*/
static void
fcloop_tgt_rscn_work(struct work_struct *work)
{
struct fcloop_rscn *tgt_rscn =
container_of(work, struct fcloop_rscn, work);
struct fcloop_tport *tport = tgt_rscn->tport;
if (tport->remoteport)
nvme_fc_rescan_remoteport(tport->remoteport);
kfree(tgt_rscn);
}
static void
fcloop_tgt_discovery_evt(struct nvmet_fc_target_port *tgtport)
{
struct fcloop_rscn *tgt_rscn;
tgt_rscn = kzalloc(sizeof(*tgt_rscn), GFP_KERNEL);
if (!tgt_rscn)
return;
tgt_rscn->tport = tgtport->private;
INIT_WORK(&tgt_rscn->work, fcloop_tgt_rscn_work);
schedule_work(&tgt_rscn->work);
}
static void
fcloop_tfcp_req_free(struct kref *ref)
{
@ -839,6 +875,7 @@ static struct nvmet_fc_target_template tgttemplate = {
.fcp_op = fcloop_fcp_op,
.fcp_abort = fcloop_tgt_fcp_abort,
.fcp_req_release = fcloop_fcp_req_release,
.discovery_event = fcloop_tgt_discovery_evt,
.max_hw_queues = FCLOOP_HW_QUEUES,
.max_sgl_segments = FCLOOP_SGL_SEGS,
.max_dif_sgl_segments = FCLOOP_SGL_SEGS,