target: Add/check max_write_same_len device attribute + update block limits VPD

This patch adds a new max_write_same_len device attribute for use with
WRITE_SAME w/ UNMAP=0 backend emulation.  This can be useful for
lowering the default backend value (IBLOCK uses 0xFFFF).

Also, update block limits VPD emulation code in spc_emulate_evpd_b0() to
report MAXIMUM WRITE SAME LENGTH, and enforce max_write_same_len during
sbc_parse() -> sbc_setup_write_same() CDB sanity checking for all emulated
WRITE_SAME w/ UNMAP=0 cases.

(Robert: Move max_write_same_len check in sbc_setup_write_same() to
         check both WRITE_SAME w/ UNMAP=1 and w/ UNMAP=0 cases)

Cc: Christoph Hellwig <hch@lst.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Robert Elliott <Elliott@hp.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

6 files changed, 33 insertions, 1 deletions

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 7b473b66da7b..2b141643f06e 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -676,6 +676,9 @@ SE_DEV_ATTR(unmap_granularity, S_IRUGO | S_IWUSR);
 DEF_DEV_ATTRIB(unmap_granularity_alignment);
 SE_DEV_ATTR(unmap_granularity_alignment, S_IRUGO | S_IWUSR);
 
+DEF_DEV_ATTRIB(max_write_same_len);
+SE_DEV_ATTR(max_write_same_len, S_IRUGO | S_IWUSR);
+
 CONFIGFS_EATTR_OPS(target_core_dev_attrib, se_dev_attrib, da_group);
 
 static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
@@ -701,6 +704,7 @@ static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
         &target_core_dev_attrib_max_unmap_block_desc_count.attr,
         &target_core_dev_attrib_unmap_granularity.attr,
         &target_core_dev_attrib_unmap_granularity_alignment.attr,
+        &target_core_dev_attrib_max_write_same_len.attr,
         NULL,
 };
 
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 599374e6d245..54439bc42dab 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -706,6 +706,16 @@ int se_dev_set_unmap_granularity_alignment(
         return 0;
 }
 
+int se_dev_set_max_write_same_len(
+        struct se_device *dev,
+        u32 max_write_same_len)
+{
+        dev->dev_attrib.max_write_same_len = max_write_same_len;
+        pr_debug("dev[%p]: Set max_write_same_len: %u\n",
+                        dev, dev->dev_attrib.max_write_same_len);
+        return 0;
+}
+
 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
 {
         if (flag != 0 && flag != 1) {
@@ -1393,6 +1403,7 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
         dev->dev_attrib.unmap_granularity_alignment =
                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
+        dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
         dev->dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
         dev->dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
 
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index bc9c52284845..93e9c1f580b0 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -24,6 +24,7 @@ int	se_dev_set_max_unmap_lba_count(struct se_device *, u32);
 int     se_dev_set_max_unmap_block_desc_count(struct se_device *, u32);
 int     se_dev_set_unmap_granularity(struct se_device *, u32);
 int     se_dev_set_unmap_granularity_alignment(struct se_device *, u32);
+int     se_dev_set_max_write_same_len(struct se_device *, u32);
 int     se_dev_set_emulate_dpo(struct se_device *, int);
 int     se_dev_set_emulate_fua_write(struct se_device *, int);
 int     se_dev_set_emulate_fua_read(struct se_device *, int);
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index a5a8f463004b..45e11d0e38c4 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -238,12 +238,19 @@ static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
 static sense_reason_t
 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
 {
+        unsigned int sectors = spc_get_write_same_sectors(cmd);
+
         if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
                 pr_err("WRITE_SAME PBDATA and LBDATA"
                         " bits not supported for Block Discard"
                         " Emulation\n");
                 return TCM_UNSUPPORTED_SCSI_OPCODE;
         }
+        if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
+                pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
+                        sectors, cmd->se_dev->dev_attrib.max_write_same_len);
+                return TCM_INVALID_CDB_FIELD;
+        }
         /*
          * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
          * translated into block discard requests within backend code.
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 4b3c18305ec8..cf1b8bb310c4 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -465,7 +465,7 @@ spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
          * Exit now if we don't support TP.
          */
         if (!have_tp)
-                return 0;
+                goto max_write_same;
 
         /*
          * Set MAXIMUM UNMAP LBA COUNT
@@ -491,6 +491,12 @@ spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
         if (dev->dev_attrib.unmap_granularity_alignment != 0)
                 buf[32] |= 0x80; /* Set the UGAVALID bit */
 
+        /*
+         * MAXIMUM WRITE SAME LENGTH
+         */
+max_write_same:
+        put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
+
         return 0;
 }
 
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 5350f6e580f0..645d90ac6097 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -71,6 +71,8 @@
 #define DA_UNMAP_GRANULARITY_DEFAULT            0
 /* Default unmap_granularity_alignment */
 #define DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT  0
+/* Default max_write_same_len, disabled by default */
+#define DA_MAX_WRITE_SAME_LEN                   0
 /* Default max transfer length */
 #define DA_FABRIC_MAX_SECTORS                   8192
 /* Emulation for Direct Page Out */
@@ -609,6 +611,7 @@ struct se_dev_attrib {
         u32             max_unmap_block_desc_count;
         u32             unmap_granularity;
         u32             unmap_granularity_alignment;
+        u32             max_write_same_len;
         struct se_device *da_dev;
         struct config_group da_group;
 };