this is the first step towards a new non-blocking error handler. This patch implements a new command timeout handler which will be sending command aborts inline without engaging SCSI EH. In addition the commands will be returned directly if the command abort succeeded, cutting down recovery times dramatically. With the original scsi error recovery I got: # time dd if=/dev/zero of=/mnt/test.blk bs=512 count=2048 oflag=sync 2048+0 records in 2048+0 records out 1048576 bytes (1.0 MB) copied, 3.72732 s, 281 kB/s real 2m14.475s user 0m0.000s sys 0m0.104s with this patchset I got: # time dd if=/dev/zero of=/mnt/test.blk bs=512 count=2048 oflag=sync 2048+0 records in 2048+0 records out 1048576 bytes (1.0 MB) copied, 31.5151 s, 33.3 kB/s real 0m31.519s user 0m0.000s sys 0m0.088s Test was to disable RSCN on the target port, disable the target port, and then start the 'dd' command as indicated. As a proof-of-concept I've also enabled the new timeout handler for virtio, so that things can be tested out more easily. As requested I've also hooked in the new SCSI timeout handler to SAS. Changes to the original version: - Use a private list in scsi_eh_abort_handler to avoid list starvation (pointed out by Joern Engel) - Terminate command aborts when the first abort fails - Do not attempt command aborts if the host is already in recovery or if the device is removed. - Flush abort workqueue if the device is removed. Comments etc are welcome. Hannes Reinecke (9): scsi: move initialization of scmd->eh_entry blk-timeout: add BLK_EH_SCHEDULED return code scsi: improved eh timeout handler virtio_scsi: Enable new EH timeout handler virtio-scsi: Implement TMF timeout libsas: Enable new EH timeout handler mptsas: Enable new EH timeout handler mpt2sas: Enable new EH timeout handler mpt3sas: Enable new EH timeout handler drivers/message/fusion/mptsas.c | 1 + drivers/message/fusion/mptscsih.c | 7 ++ drivers/message/fusion/mptscsih.h | 1 + drivers/scsi/libsas/sas_scsi_host.c | 2 +- drivers/scsi/mpt2sas/mpt2sas_scsih.c | 11 +++ drivers/scsi/mpt3sas/mpt3sas_scsih.c | 11 +++ drivers/scsi/scsi_error.c | 126 ++++++++++++++++++++++++++++++++++- drivers/scsi/scsi_lib.c | 4 +- drivers/scsi/scsi_scan.c | 3 + drivers/scsi/scsi_sysfs.c | 5 ++ drivers/scsi/scsi_transport_fc.c | 2 +- drivers/scsi/virtio_scsi.c | 14 +++- include/linux/blkdev.h | 1 + include/scsi/scsi_cmnd.h | 1 + include/scsi/scsi_device.h | 2 + 15 files changed, 184 insertions(+), 7 deletions(-) -- 1.7.12.4 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
