From 0759c666a39f16ab3a42d37b1e8fb0f246f97f52 Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Wed, 26 Feb 2014 22:57:04 +0900 Subject: [PATCH] [SCSI] scsi_debug: add ability to enable clustering This adds a module parameter to enable clustering. Without enabling clustering support, the transfer length for read and write scsi commands is limited upto 8MB when page size is 4KB and sg_tablesize is 2048 (= SCSI_MAX_SG_CHAIN_SEGMENTS). I would like to test commands with more than that transfer length. Signed-off-by: Akinobu Mita Reviewed-by: Douglas Gilbert Reviewed-by: Martin K. Petersen Signed-off-by: James Bottomley --- drivers/scsi/scsi_debug.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 0bb1d49c3552..f3e9cc038d1d 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -196,6 +196,7 @@ static unsigned int scsi_debug_unmap_max_blocks = DEF_UNMAP_MAX_BLOCKS; static unsigned int scsi_debug_unmap_max_desc = DEF_UNMAP_MAX_DESC; static unsigned int scsi_debug_write_same_length = DEF_WRITESAME_LENGTH; static bool scsi_debug_removable = DEF_REMOVABLE; +static bool scsi_debug_clustering; static int scsi_debug_cmnd_count = 0; @@ -2762,6 +2763,7 @@ static int schedule_resp(struct scsi_cmnd * cmnd, */ module_param_named(add_host, scsi_debug_add_host, int, S_IRUGO | S_IWUSR); module_param_named(ato, scsi_debug_ato, int, S_IRUGO); +module_param_named(clustering, scsi_debug_clustering, bool, S_IRUGO | S_IWUSR); module_param_named(delay, scsi_debug_delay, int, S_IRUGO | S_IWUSR); module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, S_IRUGO); module_param_named(dif, scsi_debug_dif, int, S_IRUGO); @@ -2805,6 +2807,7 @@ MODULE_VERSION(SCSI_DEBUG_VERSION); MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)"); MODULE_PARM_DESC(ato, "application tag ownership: 0=disk 1=host (def=1)"); +MODULE_PARM_DESC(clustering, "when set enables larger transfers (def=0)"); MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)"); MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs(def=8)"); MODULE_PARM_DESC(dif, "data integrity field type: 0-3 (def=0)"); @@ -3952,6 +3955,8 @@ static int sdebug_driver_probe(struct device * dev) sdbg_host = to_sdebug_host(dev); sdebug_driver_template.can_queue = scsi_debug_max_queue; + if (scsi_debug_clustering) + sdebug_driver_template.use_clustering = ENABLE_CLUSTERING; hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host)); if (NULL == hpnt) { printk(KERN_ERR "%s: scsi_register failed\n", __func__); -- 2.39.2