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authorVu Pham <vu@mellanox.com>2006-06-17 20:37:31 -0700
committerRoland Dreier <rolandd@cisco.com>2006-06-17 20:37:31 -0700
commit52fb2b50c4baa1430064c1e6c1c7df473d469df1 (patch)
tree7d538c270d6b9064b5674a8fd6f7cf81d8b8580f /drivers/infiniband/ulp/srp/ib_srp.c
parent0c5b395239cdea4db3d9c23a5738fdaf3b9ada4c (diff)
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: Vu Pham <vu@mellanox.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/ulp/srp/ib_srp.c')
-rw-r--r--drivers/infiniband/ulp/srp/ib_srp.c24
1 files changed, 17 insertions, 7 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 46292561c44..8e6b1036971 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -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);