[v2,PATCH 1/3] target: core: Send mtl in blocks

Anastasia Kovaleva
2022-10-14T11:46:19Z

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.

Signed-off-by: Anastasia Kovaleva <a.kovaleva@yadro.com>
Reviewed-by: Konstantin Shelekhin <k.shelekhin@yadro.com>
Reviewed-by: Dmitriy Bogdanov <d.bogdanov@yadro.com>
---
drivers/target/target_core_configfs.c | 2 --
drivers/target/target_core_file.c | 1 -
drivers/target/target_core_spc.c | 6 +++++-
include/target/target_core_base.h | 1 -
4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 416514c5c7ac..a126ae5dca08 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -1100,8 +1100,6 @@ 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);
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index 28aa643be5d5..f9aed9fa8ced 100644
--- a/drivers/target/target_core_file.c
+++ b/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;

diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 7cca3b15472b..4ab10437c8a9 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -519,6 +519,7 @@ 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
@@ -557,7 +558,10 @@ 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
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 8c920456edd9..cb7acbbdbcfb 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -709,7 +709,6 @@ 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;
};
--
2.30.2