On 17.02.21 21:28, Mike Christie wrote:
loop and vhost-scsi do their target cmd submission from driver workqueues. This allows them to avoid an issue where the backend may block waiting for resources like tags/requests, mem/locks, etc and that ends up blocking their entire submission path and for the case of vhost-scsi both the submission and completion path. This patch adds a helper drivers can use to submit from a lio workqueue. This code will then be extended in the next patches to fix the plugging of backend devices. Note: I'm only converting vhost/loop initially, but the workqueue based submission will work for other drivers and have similar benefits where the main target loops will not end up blocking one some backend resource. I'll port others when I have more time to test as I think we might want to make it configurable for some drivers. Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx> Tested-by: Laurence Oberman <loberman@xxxxxxxxxx> --- drivers/target/target_core_device.c | 10 ++++-- drivers/target/target_core_internal.h | 1 + drivers/target/target_core_transport.c | 42 +++++++++++++++++++++++++- include/target/target_core_base.h | 8 ++++- include/target/target_core_fabric.h | 2 ++ 5 files changed, 59 insertions(+), 4 deletions(-)
Looks good. Reviewed-by: Bodo Stroesser <bostroesser@xxxxxxxxx>
