From 5de619a31d9cb051d1f818e661af4e54def82316 Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Sun, 17 Jul 2011 02:57:58 -0700 Subject: target: Update QUEUE ALGORITHM MODIFIER control page default This patch adds the default 'Unrestricted reordering allowed' for SCSI control mode page QUEUE ALGORITHM MODIFIER on a per se_device basis in target_modesense_control() following spc4r23. This includes a new emuluate_rest_reord configfs attribute that currently (only) accepts zero to signal 'Unrestricted reordering allowed' in control mode page usage by the backend target device. Reported-by: Roland Dreier Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_cdb.c | 29 +++++++++++++++++++++++++++++ drivers/target/target_core_configfs.c | 4 ++++ drivers/target/target_core_device.c | 15 ++++++++++++++- 3 files changed, 47 insertions(+), 1 deletion(-) (limited to 'drivers/target') diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c index 982830023661..145739bcf752 100644 --- a/drivers/target/target_core_cdb.c +++ b/drivers/target/target_core_cdb.c @@ -774,6 +774,35 @@ target_modesense_control(struct se_device *dev, unsigned char *p) p[0] = 0x0a; p[1] = 0x0a; p[2] = 2; + /* + * From spc4r23, 7.4.7 Control mode page + * + * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies + * restrictions on the algorithm used for reordering commands + * having the SIMPLE task attribute (see SAM-4). + * + * Table 368 -- QUEUE ALGORITHM MODIFIER field + * Code Description + * 0h Restricted reordering + * 1h Unrestricted reordering allowed + * 2h to 7h Reserved + * 8h to Fh Vendor specific + * + * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that + * the device server shall order the processing sequence of commands + * having the SIMPLE task attribute such that data integrity is maintained + * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol + * requests is halted at any time, the final value of all data observable + * on the medium shall be the same as if all the commands had been processed + * with the ORDERED task attribute). + * + * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the + * device server may reorder the processing sequence of commands having the + * SIMPLE task attribute in any manner. Any data integrity exposures related to + * command sequence order shall be explicitly handled by the application client + * through the selection of appropriate ommands and task attributes. + */ + p[3] = (dev->se_sub_dev->se_dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10; /* * From spc4r17, section 7.4.6 Control mode Page * diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c index e56c39daeec6..a92176d2e187 100644 --- a/drivers/target/target_core_configfs.c +++ b/drivers/target/target_core_configfs.c @@ -701,6 +701,9 @@ SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR); DEF_DEV_ATTRIB(is_nonrot); SE_DEV_ATTR(is_nonrot, S_IRUGO | S_IWUSR); +DEF_DEV_ATTRIB(emulate_rest_reord); +SE_DEV_ATTR(emulate_rest_reord, S_IRUGO | S_IWUSR); + DEF_DEV_ATTRIB_RO(hw_block_size); SE_DEV_ATTR_RO(hw_block_size); @@ -750,6 +753,7 @@ static struct configfs_attribute *target_core_dev_attrib_attrs[] = { &target_core_dev_attrib_emulate_tpws.attr, &target_core_dev_attrib_enforce_pr_isids.attr, &target_core_dev_attrib_is_nonrot.attr, + &target_core_dev_attrib_emulate_rest_reord.attr, &target_core_dev_attrib_hw_block_size.attr, &target_core_dev_attrib_block_size.attr, &target_core_dev_attrib_hw_max_sectors.attr, diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 81860ddc7cc4..b38b6c993e65 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -857,6 +857,7 @@ void se_dev_set_default_attribs( dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA; dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS; dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT; + dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD; /* * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK * iblock_create_virtdevice() from struct queue_limits values @@ -1128,11 +1129,23 @@ int se_dev_set_is_nonrot(struct se_device *dev, int flag) return -EINVAL; } dev->se_sub_dev->se_dev_attrib.is_nonrot = flag; - printk(KERN_INFO "dev[%p]: SE Device is_nonrot bit: %d\n", + pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n", dev, flag); return 0; } +int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag) +{ + if (flag != 0) { + printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted" + " reordering not implemented\n", dev); + return -ENOSYS; + } + dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag; + pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag); + return 0; +} + /* * Note, this can only be called on unexported SE Device Object. */ -- cgit v1.2.3