Commit 52fb2b50 authored by Vu Pham's avatar Vu Pham Committed by Roland Dreier

IB/srp: Allow cmd_per_lun to be set per target port

Allow userspace to throttle traffic on a given connection to a target
port by adding "max_cmd_per_lun=xyz" to lower the cmd_per_lun value
set for that scsi_host.
Signed-off-by: default avatarVu Pham <vu@mellanox.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 0c5b3952
......@@ -1491,6 +1491,7 @@ enum {
SRP_OPT_PKEY = 1 << 3,
SRP_OPT_SERVICE_ID = 1 << 4,
SRP_OPT_MAX_SECT = 1 << 5,
SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
SRP_OPT_ALL = (SRP_OPT_ID_EXT |
SRP_OPT_IOC_GUID |
SRP_OPT_DGID |
......@@ -1499,13 +1500,14 @@ enum {
};
static match_table_t srp_opt_tokens = {
{ SRP_OPT_ID_EXT, "id_ext=%s" },
{ SRP_OPT_IOC_GUID, "ioc_guid=%s" },
{ SRP_OPT_DGID, "dgid=%s" },
{ SRP_OPT_PKEY, "pkey=%x" },
{ SRP_OPT_SERVICE_ID, "service_id=%s" },
{ SRP_OPT_MAX_SECT, "max_sect=%d" },
{ SRP_OPT_ERR, NULL }
{ SRP_OPT_ID_EXT, "id_ext=%s" },
{ SRP_OPT_IOC_GUID, "ioc_guid=%s" },
{ SRP_OPT_DGID, "dgid=%s" },
{ SRP_OPT_PKEY, "pkey=%x" },
{ 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_ERR, NULL }
};
static int srp_parse_options(const char *buf, struct srp_target_port *target)
......@@ -1581,6 +1583,14 @@ static int srp_parse_options(const char *buf, struct srp_target_port *target)
target->scsi_host->max_sectors = token;
break;
case SRP_OPT_MAX_CMD_PER_LUN:
if (match_int(args, &token)) {
printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
goto out;
}
target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
break;
default:
printk(KERN_WARNING PFX "unknown parameter or missing value "
"'%s' in target creation request\n", p);
......
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