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nvme-fc: add uevent for auto-connect

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To support auto-connecting to FC-NVME devices upon their dynamic
appearance, add a uevent that can kick off connection scripts.
uevent is posted against the fc_udev device.

patch set tested with the following rule to kick an nvme-cli connect-all
for the FC initiator and FC target ports. This is just an example for
testing and not intended for real life use.

ACTION=="change", SUBSYSTEM=="fc", ENV{FC_EVENT}=="nvmediscovery", \
        ENV{NVMEFC_HOST_TRADDR}=="*", ENV{NVMEFC_TRADDR}=="*", \
	RUN+="/bin/sh -c '/usr/local/sbin/nvme connect-all --transport=fc --host-traddr=$env{NVMEFC_HOST_TRADDR} --traddr=$env{NVMEFC_TRADDR} >> /tmp/nvme_fc.log'"

I will post proposed udev/systemd scripts for possible kernel support.

Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
James Smart 2017-09-14 10:38:42 -07:00 • committed by Christoph Hellwig
parent d1f1071f81
commit eaefd5abf6
2 changed files with 51 additions and 0 deletions
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49
drivers/nvme/host/fc.c
View file

@ -452,6 +452,36 @@ nvme_fc_unregister_localport(struct nvme_fc_local_port *portptr)
}
EXPORT_SYMBOL_GPL(nvme_fc_unregister_localport);
/*
* TRADDR strings, per FC-NVME are fixed format:
* "nn-0x<16hexdigits>:pn-0x<16hexdigits>" - 43 characters
* udev event will only differ by prefix of what field is
* being specified:
* "NVMEFC_HOST_TRADDR=" or "NVMEFC_TRADDR=" - 19 max characters
* 19 + 43 + null_fudge = 64 characters
*/
#define FCNVME_TRADDR_LENGTH 64
static void
nvme_fc_signal_discovery_scan(struct nvme_fc_lport *lport,
struct nvme_fc_rport *rport)
{
char hostaddr[FCNVME_TRADDR_LENGTH]; /* NVMEFC_HOST_TRADDR=...*/
char tgtaddr[FCNVME_TRADDR_LENGTH]; /* NVMEFC_TRADDR=...*/
char *envp[4] = { "FC_EVENT=nvmediscovery", hostaddr, tgtaddr, NULL };
if (!(rport->remoteport.port_role & FC_PORT_ROLE_NVME_DISCOVERY))
return;
snprintf(hostaddr, sizeof(hostaddr),
"NVMEFC_HOST_TRADDR=nn-0x%016llx:pn-0x%016llx",
lport->localport.node_name, lport->localport.port_name);
snprintf(tgtaddr, sizeof(tgtaddr),
"NVMEFC_TRADDR=nn-0x%016llx:pn-0x%016llx",
rport->remoteport.node_name, rport->remoteport.port_name);
kobject_uevent_env(&fc_udev_device->kobj, KOBJ_CHANGE, envp);
}
/**
* nvme_fc_register_remoteport - transport entry point called by an
* LLDD to register the existence of a NVME
@ -516,6 +546,8 @@ nvme_fc_register_remoteport(struct nvme_fc_local_port *localport,
list_add_tail(&newrec->endp_list, &lport->endp_list);
spin_unlock_irqrestore(&nvme_fc_lock, flags);
nvme_fc_signal_discovery_scan(lport, newrec);
*portptr = &newrec->remoteport;
return 0;
@ -634,6 +666,23 @@ nvme_fc_unregister_remoteport(struct nvme_fc_remote_port *portptr)
}
EXPORT_SYMBOL_GPL(nvme_fc_unregister_remoteport);
/**
* nvme_fc_rescan_remoteport - transport entry point called by an
* LLDD to request a nvme device rescan.
* @remoteport: pointer to the (registered) remote port that is to be
* rescanned.
*
* Returns: N/A
*/
void
nvme_fc_rescan_remoteport(struct nvme_fc_remote_port *remoteport)
{
struct nvme_fc_rport *rport = remoteport_to_rport(remoteport);
nvme_fc_signal_discovery_scan(rport->lport, rport);
}
EXPORT_SYMBOL_GPL(nvme_fc_rescan_remoteport);
/* *********************** FC-NVME DMA Handling **************************** */

2
include/linux/nvme-fc-driver.h
View file

@ -446,6 +446,8 @@ int nvme_fc_register_remoteport(struct nvme_fc_local_port *localport,
int nvme_fc_unregister_remoteport(struct nvme_fc_remote_port *remoteport);
void nvme_fc_rescan_remoteport(struct nvme_fc_remote_port *remoteport);
/*