scsi: target: core: Send max transfer length in blocks

A MAXIMUM TRANSFER LENGTH value indicates the maximum transfer length in
logical blocks that the device server accepts for a single command. Fix
function sending the length in sectors instead of blocks.

This patch also removes the special casing for fileio in block_size_store
since this logic in now unified in spc_emulate_evpd_b0() for all backends.
Reviewed-by: Konstantin Shelekhin <k.shelekhin@yadro.com>
Reviewed-by: Dmitriy Bogdanov <d.bogdanov@yadro.com>
Signed-off-by: Anastasia Kovaleva <a.kovaleva@yadro.com>
Link: https://lore.kernel.org/r/20221114102500.88892-2-a.kovaleva@yadro.comReviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/target/target_core_configfs.c

@@ -1102,8 +1102,6 @@ static ssize_t block_size_store(struct config_item *item,
 	}
 
 	da->block_size = val;
-	if (da->max_bytes_per_io)
-		da->hw_max_sectors = da->max_bytes_per_io / val;
 
 	pr_debug("dev[%p]: SE Device block_size changed to %u\n",
 			da->da_dev, val);

drivers/target/target_core_file.c

@@ -193,7 +193,6 @@ static int fd_configure_device(struct se_device *dev)
 	}
 
 	dev->dev_attrib.hw_block_size = fd_dev->fd_block_size;
-	dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES;
 	dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size;
 	dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
 

drivers/target/target_core_spc.c

@@ -515,6 +515,7 @@ spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
 	struct se_device *dev = cmd->se_dev;
 	u32 mtl = 0;
 	int have_tp = 0, opt, min;
+	u32 io_max_blocks;
 
 	/*
 	 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
@@ -553,7 +554,10 @@ spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
 		mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) /
 		       dev->dev_attrib.block_size;
 	}
-	put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]);
+	io_max_blocks = mult_frac(dev->dev_attrib.hw_max_sectors,
+			dev->dev_attrib.hw_block_size,
+			dev->dev_attrib.block_size);
+	put_unaligned_be32(min_not_zero(mtl, io_max_blocks), &buf[8]);
 
 	/*
 	 * Set OPTIMAL TRANSFER LENGTH

include/target/target_core_base.h

@@ -712,7 +712,6 @@ struct se_dev_attrib {
 	u32		unmap_granularity;
 	u32		unmap_granularity_alignment;
 	u32		max_write_same_len;
-	u32		max_bytes_per_io;
 	struct se_device *da_dev;
 	struct config_group da_group;
 };