linux/drivers/target/target_core_iblock.h
Mike Christie 415ccd9811 scsi: target: iblock: Add backend plug/unplug callouts
This patch adds plug/unplug callouts for iblock. For an initiator driver
like iSCSI which wants to pass multiple cmds to its xmit thread instead of
one cmd at a time, this increases IOPS by around 10% with vhost-scsi
(combined with the last patches we can see a total 40-50% increase). For
driver combos like tcm_loop and faster drivers like the iSER initiator, we
can still see IOPS increase by 20-30% when tcm_loop's nr_hw_queues setting
is also increased.

Link: https://lore.kernel.org/r/20210227170006.5077-23-michael.christie@oracle.com
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2021-03-04 17:37:02 -05:00

40 lines
824 B
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef TARGET_CORE_IBLOCK_H
#define TARGET_CORE_IBLOCK_H
#include <linux/atomic.h>
#include <linux/refcount.h>
#include <linux/blkdev.h>
#include <target/target_core_base.h>
#define IBLOCK_VERSION "4.0"
#define IBLOCK_MAX_CDBS 16
struct iblock_req {
refcount_t pending;
atomic_t ib_bio_err_cnt;
} ____cacheline_aligned;
#define IBDF_HAS_UDEV_PATH 0x01
#define IBD_PLUGF_PLUGGED 0x01
struct iblock_dev_plug {
struct se_dev_plug se_plug;
struct blk_plug blk_plug;
unsigned long flags;
};
struct iblock_dev {
struct se_device dev;
unsigned char ibd_udev_path[SE_UDEV_PATH_LEN];
u32 ibd_flags;
struct bio_set ibd_bio_set;
struct block_device *ibd_bd;
bool ibd_readonly;
struct iblock_dev_plug *ibd_plug;
} ____cacheline_aligned;
#endif /* TARGET_CORE_IBLOCK_H */