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nvme-fcloop: add target to host LS request support

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Add support for performing LS requests from target to host.
Include sending request from targetport, reception into host,
host sending ls rsp.

Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
James Smart 2020-03-31 09:50:01 -07:00 committed by Jens Axboe
parent ea39765843
commit 437c0b824d
1 changed files with 118 additions and 12 deletions
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130
drivers/nvme/target/fcloop.c
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@ -208,10 +208,13 @@ struct fcloop_rport {
};
struct fcloop_tport {
struct nvmet_fc_target_port *targetport;
struct nvme_fc_remote_port *remoteport;
struct fcloop_nport *nport;
struct fcloop_lport *lport;
struct nvmet_fc_target_port *targetport;
struct nvme_fc_remote_port *remoteport;
struct fcloop_nport *nport;
struct fcloop_lport *lport;
spinlock_t lock;
struct list_head ls_list;
struct work_struct ls_work;
};
struct fcloop_nport {
@ -226,11 +229,6 @@ struct fcloop_nport {
u32 port_id;
};
enum {
H2T = 0,
T2H = 1,
};
struct fcloop_lsreq {
struct nvmefc_ls_req *lsreq;
struct nvmefc_ls_rsp ls_rsp;
@ -337,7 +335,6 @@ fcloop_h2t_ls_req(struct nvme_fc_local_port *localport,
struct fcloop_rport *rport = remoteport->private;
int ret = 0;
tls_req->lsdir = H2T;
tls_req->lsreq = lsreq;
INIT_LIST_HEAD(&tls_req->ls_list);
@ -351,8 +348,9 @@ fcloop_h2t_ls_req(struct nvme_fc_local_port *localport,
}
tls_req->status = 0;
ret = nvmet_fc_rcv_ls_req(rport->targetport, NULL, &tls_req->ls_rsp,
lsreq->rqstaddr, lsreq->rqstlen);
ret = nvmet_fc_rcv_ls_req(rport->targetport, rport,
&tls_req->ls_rsp,
lsreq->rqstaddr, lsreq->rqstlen);
return ret;
}
@ -384,6 +382,99 @@ fcloop_h2t_xmt_ls_rsp(struct nvmet_fc_target_port *targetport,
return 0;
}
static void
fcloop_tport_lsrqst_work(struct work_struct *work)
{
struct fcloop_tport *tport =
container_of(work, struct fcloop_tport, ls_work);
struct fcloop_lsreq *tls_req;
spin_lock(&tport->lock);
for (;;) {
tls_req = list_first_entry_or_null(&tport->ls_list,
struct fcloop_lsreq, ls_list);
if (!tls_req)
break;
list_del(&tls_req->ls_list);
spin_unlock(&tport->lock);
tls_req->lsreq->done(tls_req->lsreq, tls_req->status);
/*
* callee may free memory containing tls_req.
* do not reference lsreq after this.
*/
spin_lock(&tport->lock);
}
spin_unlock(&tport->lock);
}
static int
fcloop_t2h_ls_req(struct nvmet_fc_target_port *targetport, void *hosthandle,
struct nvmefc_ls_req *lsreq)
{
struct fcloop_lsreq *tls_req = lsreq->private;
struct fcloop_tport *tport = targetport->private;
int ret = 0;
/*
* hosthandle should be the dst.rport value.
* hosthandle ignored as fcloop currently is
* 1:1 tgtport vs remoteport
*/
tls_req->lsreq = lsreq;
INIT_LIST_HEAD(&tls_req->ls_list);
if (!tport->remoteport) {
tls_req->status = -ECONNREFUSED;
spin_lock(&tport->lock);
list_add_tail(&tport->ls_list, &tls_req->ls_list);
spin_unlock(&tport->lock);
schedule_work(&tport->ls_work);
return ret;
}
tls_req->status = 0;
ret = nvme_fc_rcv_ls_req(tport->remoteport, &tls_req->ls_rsp,
lsreq->rqstaddr, lsreq->rqstlen);
return ret;
}
static int
fcloop_t2h_xmt_ls_rsp(struct nvme_fc_local_port *localport,
struct nvme_fc_remote_port *remoteport,
struct nvmefc_ls_rsp *lsrsp)
{
struct fcloop_lsreq *tls_req = ls_rsp_to_lsreq(lsrsp);
struct nvmefc_ls_req *lsreq = tls_req->lsreq;
struct fcloop_rport *rport = remoteport->private;
struct nvmet_fc_target_port *targetport = rport->targetport;
struct fcloop_tport *tport;
memcpy(lsreq->rspaddr, lsrsp->rspbuf,
((lsreq->rsplen < lsrsp->rsplen) ?
lsreq->rsplen : lsrsp->rsplen));
lsrsp->done(lsrsp);
if (targetport) {
tport = targetport->private;
spin_lock(&tport->lock);
list_add_tail(&tport->ls_list, &tls_req->ls_list);
spin_unlock(&tport->lock);
schedule_work(&tport->ls_work);
}
return 0;
}
static void
fcloop_t2h_host_release(void *hosthandle)
{
/* host handle ignored for now */
}
/*
* Simulate reception of RSCN and converting it to a initiator transport
* call to rescan a remote port.
@ -775,6 +866,12 @@ fcloop_h2t_ls_abort(struct nvme_fc_local_port *localport,
{
}
static void
fcloop_t2h_ls_abort(struct nvmet_fc_target_port *targetport,
void *hosthandle, struct nvmefc_ls_req *lsreq)
{
}
static void
fcloop_fcp_abort(struct nvme_fc_local_port *localport,
struct nvme_fc_remote_port *remoteport,
@ -874,6 +971,7 @@ fcloop_targetport_delete(struct nvmet_fc_target_port *targetport)
{
struct fcloop_tport *tport = targetport->private;
flush_work(&tport->ls_work);
fcloop_nport_put(tport->nport);
}
@ -890,6 +988,7 @@ static struct nvme_fc_port_template fctemplate = {
.fcp_io = fcloop_fcp_req,
.ls_abort = fcloop_h2t_ls_abort,
.fcp_abort = fcloop_fcp_abort,
.xmt_ls_rsp = fcloop_t2h_xmt_ls_rsp,
.max_hw_queues = FCLOOP_HW_QUEUES,
.max_sgl_segments = FCLOOP_SGL_SEGS,
.max_dif_sgl_segments = FCLOOP_SGL_SEGS,
@ -908,6 +1007,9 @@ static struct nvmet_fc_target_template tgttemplate = {
.fcp_abort = fcloop_tgt_fcp_abort,
.fcp_req_release = fcloop_fcp_req_release,
.discovery_event = fcloop_tgt_discovery_evt,
.ls_req = fcloop_t2h_ls_req,
.ls_abort = fcloop_t2h_ls_abort,
.host_release = fcloop_t2h_host_release,
.max_hw_queues = FCLOOP_HW_QUEUES,
.max_sgl_segments = FCLOOP_SGL_SEGS,
.max_dif_sgl_segments = FCLOOP_SGL_SEGS,
@ -916,6 +1018,7 @@ static struct nvmet_fc_target_template tgttemplate = {
.target_features = 0,
/* sizes of additional private data for data structures */
.target_priv_sz = sizeof(struct fcloop_tport),
.lsrqst_priv_sz = sizeof(struct fcloop_lsreq),
};
static ssize_t
@ -1265,6 +1368,9 @@ fcloop_create_target_port(struct device *dev, struct device_attribute *attr,
tport->nport = nport;
tport->lport = nport->lport;
nport->tport = tport;
spin_lock_init(&tport->lock);
INIT_WORK(&tport->ls_work, fcloop_tport_lsrqst_work);
INIT_LIST_HEAD(&tport->ls_list);
return count;
}