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

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

drivers/infiniband/ulp/srp/ib_srp.c

+17 −7
Original line number Original line Diff line number Diff line
@@ -1491,6 +1491,7 @@ enum { 
	SRP_OPT_PKEY		= 1 << 3,

	SRP_OPT_PKEY		= 1 << 3,

	SRP_OPT_SERVICE_ID	= 1 << 4,

	SRP_OPT_SERVICE_ID	= 1 << 4,

	SRP_OPT_MAX_SECT	= 1 << 5,

	SRP_OPT_MAX_SECT	= 1 << 5,

	SRP_OPT_MAX_CMD_PER_LUN	= 1 << 6,

	SRP_OPT_ALL		= (SRP_OPT_ID_EXT	|

	SRP_OPT_ALL		= (SRP_OPT_ID_EXT	|

				   SRP_OPT_IOC_GUID	|

				   SRP_OPT_IOC_GUID	|

				   SRP_OPT_DGID		|

				   SRP_OPT_DGID		|
@@ -1505,6 +1506,7 @@ static match_table_t srp_opt_tokens = { 
	{ SRP_OPT_PKEY,			"pkey=%x" 		},

	{ SRP_OPT_PKEY,			"pkey=%x" 		},

	{ SRP_OPT_SERVICE_ID,		"service_id=%s"		},

	{ SRP_OPT_SERVICE_ID,		"service_id=%s"		},

	{ SRP_OPT_MAX_SECT,		"max_sect=%d" 		},

	{ SRP_OPT_MAX_SECT,		"max_sect=%d" 		},

	{ SRP_OPT_MAX_CMD_PER_LUN,	"max_cmd_per_lun=%d" 	},

	{ SRP_OPT_ERR,			NULL 			}

	{ SRP_OPT_ERR,			NULL 			}

};

};
@@ -1581,6 +1583,14 @@ static int srp_parse_options(const char *buf, struct srp_target_port *target) 
			target->scsi_host->max_sectors = token;

			target->scsi_host->max_sectors = token;

			break;

			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:

		default:

			printk(KERN_WARNING PFX "unknown parameter or missing value "

			printk(KERN_WARNING PFX "unknown parameter or missing value "

			       "'%s' in target creation request\n", p);

			       "'%s' in target creation request\n", p);