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| author | Mike Christie <michael.christie@oracle.com> | 2021-02-27 11:00:02 -0600 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-03-04 17:37:02 -0500 |
| commit | 302990ac3b1b1a2b7b66f59a5c88038a51fbe18e (patch) | |
| tree | be970c2bc90c9b7f68cc2c2217c2f5168bbdc68b /include/target | |
| parent | 802ec4f672ed64fc3e6a09aa0e4a92a018383767 (diff) | |
| download | lwn-302990ac3b1b1a2b7b66f59a5c88038a51fbe18e.tar.gz lwn-302990ac3b1b1a2b7b66f59a5c88038a51fbe18e.zip | |
scsi: target: core: Fix backend plugging
target_core_iblock is plugging and unplugging on every command and this is
causing perf issues for drivers that prefer batched cmds. With recent
patches we can now take multiple cmds from a fabric driver queue and then
pass them down the backend drivers in a batch. This patch adds this support
by adding 2 callouts to the backend for plugging and unplugging the
device. Subsequent commits will add support for iblock and tcmu device
plugging.
Link: https://lore.kernel.org/r/20210227170006.5077-22-michael.christie@oracle.com
Reviewed-by: Bodo Stroesser <bostroesser@gmail.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'include/target')
| -rw-r--r-- | include/target/target_core_backend.h | 2 | ||||
| -rw-r--r-- | include/target/target_core_base.h | 4 |
2 files changed, 6 insertions, 0 deletions
diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h index ce2fba49c95d..1f78b09bba55 100644 --- a/include/target/target_core_backend.h +++ b/include/target/target_core_backend.h @@ -34,6 +34,8 @@ struct target_backend_ops { int (*configure_device)(struct se_device *); void (*destroy_device)(struct se_device *); void (*free_device)(struct se_device *device); + struct se_dev_plug *(*plug_device)(struct se_device *se_dev); + void (*unplug_device)(struct se_dev_plug *se_plug); ssize_t (*set_configfs_dev_params)(struct se_device *, const char *, ssize_t); diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index fbe5b5b93afa..cf445c3a551a 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -770,6 +770,10 @@ struct se_cmd_queue { struct work_struct work; }; +struct se_dev_plug { + struct se_device *se_dev; +}; + struct se_device_queue { struct list_head state_list; spinlock_t lock; |