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415ccd9811
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>
39 lines
824 B
C
39 lines
824 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef TARGET_CORE_IBLOCK_H
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#define TARGET_CORE_IBLOCK_H
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#include <linux/atomic.h>
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#include <linux/refcount.h>
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#include <linux/blkdev.h>
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#include <target/target_core_base.h>
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#define IBLOCK_VERSION "4.0"
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#define IBLOCK_MAX_CDBS 16
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struct iblock_req {
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refcount_t pending;
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atomic_t ib_bio_err_cnt;
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} ____cacheline_aligned;
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#define IBDF_HAS_UDEV_PATH 0x01
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#define IBD_PLUGF_PLUGGED 0x01
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struct iblock_dev_plug {
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struct se_dev_plug se_plug;
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struct blk_plug blk_plug;
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unsigned long flags;
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};
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struct iblock_dev {
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struct se_device dev;
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unsigned char ibd_udev_path[SE_UDEV_PATH_LEN];
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u32 ibd_flags;
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struct bio_set ibd_bio_set;
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struct block_device *ibd_bd;
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bool ibd_readonly;
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struct iblock_dev_plug *ibd_plug;
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} ____cacheline_aligned;
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#endif /* TARGET_CORE_IBLOCK_H */
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