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IB/srp: Add target_can_queue login parameter

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Although I'm not sure this parameter is useful for regular SRP users,
setting this parameter to 1 has shown to be invaluable for testing the
block layer core, SCSI core and device mapper queue running mechanisms.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche 2018-01-22 14:27:13 -08:00 committed by Doug Ledford
parent 19f313438c
commit b0780ee56e
2 changed files with 23 additions and 0 deletions
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22
drivers/infiniband/ulp/srp/ib_srp.c
View file

@ -3018,6 +3018,16 @@ static int srp_reset_host(struct scsi_cmnd *scmnd)
return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
}
static int srp_target_alloc(struct scsi_target *starget)
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct srp_target_port *target = host_to_target(shost);
if (target->target_can_queue)
starget->can_queue = target->target_can_queue;
return 0;
}
static int srp_slave_alloc(struct scsi_device *sdev)
{
struct Scsi_Host *shost = sdev->host;
@ -3231,6 +3241,7 @@ static struct scsi_host_template srp_template = {
.module = THIS_MODULE,
.name = "InfiniBand SRP initiator",
.proc_name = DRV_NAME,
.target_alloc = srp_target_alloc,
.slave_alloc = srp_slave_alloc,
.slave_configure = srp_slave_configure,
.info = srp_target_info,
@ -3398,6 +3409,7 @@ enum {
SRP_OPT_QUEUE_SIZE = 1 << 14,
SRP_OPT_IP_SRC = 1 << 15,
SRP_OPT_IP_DEST = 1 << 16,
SRP_OPT_TARGET_CAN_QUEUE= 1 << 17,
};
static unsigned int srp_opt_mandatory[] = {
@ -3419,6 +3431,7 @@ static const match_table_t srp_opt_tokens = {
{ SRP_OPT_SERVICE_ID, "service_id=%s" },
{ SRP_OPT_MAX_SECT, "max_sect=%d" },
{ SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
{ SRP_OPT_TARGET_CAN_QUEUE, "target_can_queue=%d" },
{ SRP_OPT_IO_CLASS, "io_class=%x" },
{ SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
{ SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
@ -3607,6 +3620,15 @@ static int srp_parse_options(struct net *net, const char *buf,
target->scsi_host->cmd_per_lun = token;
break;
case SRP_OPT_TARGET_CAN_QUEUE:
if (match_int(args, &token) || token < 1) {
pr_warn("bad max target_can_queue parameter '%s'\n",
p);
goto out;
}
target->target_can_queue = token;
break;
case SRP_OPT_IO_CLASS:
if (match_hex(args, &token)) {
pr_warn("bad IO class parameter '%s'\n", p);

1
drivers/infiniband/ulp/srp/ib_srp.h
View file

@ -211,6 +211,7 @@ struct srp_target_port {
char target_name[32];
unsigned int scsi_id;
unsigned int sg_tablesize;
unsigned int target_can_queue;
int mr_pool_size;
int mr_per_cmd;
int queue_size;