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firewire: fw-sbp2: implement nonexclusive login 

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
This commit is contained in:
Stefan Richter 2007-06-17 23:55:41 +02:00
parent 79352e9f94
commit 5cd54c94b0
1 changed files with 15 additions and 7 deletions
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22
drivers/firewire/fw-sbp2.c
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@ -30,6 +30,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mod_devicetable.h>
#include <linux/device.h>
#include <linux/scatterlist.h>
@ -47,6 +48,18 @@
#include "fw-topology.h"
#include "fw-device.h"
/*
* So far only bridges from Oxford Semiconductor are known to support
* concurrent logins. Depending on firmware, four or two concurrent logins
* are possible on OXFW911 and newer Oxsemi bridges.
*
* Concurrent logins are useful together with cluster filesystems.
*/
static int sbp2_param_exclusive_login = 1;
module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644);
MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
"(default = Y, use N for concurrent initiators)");
/* I don't know why the SCSI stack doesn't define something like this... */
typedef void (*scsi_done_fn_t)(struct scsi_cmnd *);
@ -155,7 +168,7 @@ struct sbp2_orb {
#define MANAGEMENT_ORB_LUN(v) ((v))
#define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16)
#define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20)
#define MANAGEMENT_ORB_EXCLUSIVE ((1) << 28)
#define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0)
#define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29)
#define MANAGEMENT_ORB_NOTIFY ((1) << 31)
@ -431,14 +444,9 @@ sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation,
orb->request.status_fifo.high = sd->address_handler.offset >> 32;
orb->request.status_fifo.low = sd->address_handler.offset;
/*
* FIXME: Yeah, ok this isn't elegant, we hardwire exclusive
* login and 1 second reconnect time. The reconnect setting
* is probably fine, but the exclusive login should be an option.
*/
if (function == SBP2_LOGIN_REQUEST) {
orb->request.misc |=
MANAGEMENT_ORB_EXCLUSIVE |
MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login) |
MANAGEMENT_ORB_RECONNECT(0);
}