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authorNicholas Bellinger <nab@daterainc.com>2013-08-20 14:24:09 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2013-09-09 14:29:35 -0700
commit0123a9ec6a4fea20d5afea90c9b47fb73fb1bc34 (patch)
tree6ac9f2539a9db0013757f51b18a97f3bf8ded49a /drivers/target
parent76dde50ebef75773ea2b68e0bf914e87e6a3711c (diff)
target: Add MAXIMUM COMPARE AND WRITE LENGTH in Block Limits VPD
This patch adds the MAXIMUM COMPARE AND WRITE LENGTH bit, currently hardcoded to a single logical block (NoLB=1) within the Block Limits VPD in spc_emulate_evpd_b0(). Also add emulate_caw device attribute in configfs (enabled by default) to allow the exposure of this bit to be disabled, if necessary. Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Martin Petersen <martin.petersen@oracle.com> Cc: Chris Mason <chris.mason@fusionio.com> Cc: James Bottomley <JBottomley@Parallels.com> Cc: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_configfs.c4
-rw-r--r--drivers/target/target_core_device.c14
-rw-r--r--drivers/target/target_core_internal.h1
-rw-r--r--drivers/target/target_core_spc.c5
4 files changed, 24 insertions, 0 deletions
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index f67a9afdeb2..24517d4aa1d 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -636,6 +636,9 @@ SE_DEV_ATTR(emulate_tpu, S_IRUGO | S_IWUSR);
DEF_DEV_ATTRIB(emulate_tpws);
SE_DEV_ATTR(emulate_tpws, S_IRUGO | S_IWUSR);
+DEF_DEV_ATTRIB(emulate_caw);
+SE_DEV_ATTR(emulate_caw, S_IRUGO | S_IWUSR);
+
DEF_DEV_ATTRIB(enforce_pr_isids);
SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR);
@@ -693,6 +696,7 @@ static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
&target_core_dev_attrib_emulate_tas.attr,
&target_core_dev_attrib_emulate_tpu.attr,
&target_core_dev_attrib_emulate_tpws.attr,
+ &target_core_dev_attrib_emulate_caw.attr,
&target_core_dev_attrib_enforce_pr_isids.attr,
&target_core_dev_attrib_is_nonrot.attr,
&target_core_dev_attrib_emulate_rest_reord.attr,
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 8f4142fe5f1..0b5f86806f1 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -890,6 +890,19 @@ int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
return 0;
}
+int se_dev_set_emulate_caw(struct se_device *dev, int flag)
+{
+ if (flag != 0 && flag != 1) {
+ pr_err("Illegal value %d\n", flag);
+ return -EINVAL;
+ }
+ dev->dev_attrib.emulate_caw = flag;
+ pr_debug("dev[%p]: SE Device CompareAndWrite (AtomicTestandSet): %d\n",
+ dev, flag);
+
+ return 0;
+}
+
int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
{
if ((flag != 0) && (flag != 1)) {
@@ -1423,6 +1436,7 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
+ dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
dev->dev_attrib.is_nonrot = DA_IS_NONROT;
dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index 18d49df4d0a..805ceb4285b 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -33,6 +33,7 @@ int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *, int);
int se_dev_set_emulate_tas(struct se_device *, int);
int se_dev_set_emulate_tpu(struct se_device *, int);
int se_dev_set_emulate_tpws(struct se_device *, int);
+int se_dev_set_emulate_caw(struct se_device *, int);
int se_dev_set_enforce_pr_isids(struct se_device *, int);
int se_dev_set_is_nonrot(struct se_device *, int);
int se_dev_set_emulate_rest_reord(struct se_device *dev, int);
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 4cb667d720a..ed7077a67d7 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -457,6 +457,11 @@ spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
/* Set WSNZ to 1 */
buf[4] = 0x01;
+ /*
+ * Set MAXIMUM COMPARE AND WRITE LENGTH
+ */
+ if (dev->dev_attrib.emulate_caw)
+ buf[5] = 0x01;
/*
* Set OPTIMAL TRANSFER LENGTH GRANULARITY