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[v16,22/26] scsi: sd: Increase retry count for zoned writes

Message ID 20241119002815.600608-23-bvanassche@acm.org (mailing list archive)
State New
Headers show
Series Improve write performance for zoned UFS devices | expand

Commit Message

Bart Van Assche Nov. 19, 2024, 12:28 a.m. UTC 
If the write order is preserved, increase the number of retries for
write commands sent to a sequential zone to the maximum number of
outstanding commands because in the worst case the number of times
reordered zoned writes have to be retried is (number of outstanding
writes per sequential zone) - 1.

Cc: Damien Le Moal <dlemoal@kernel.org>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/scsi/sd.c | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 8947dab132d7..117fce3b1c7b 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1408,6 +1408,13 @@  static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
 	cmd->transfersize = sdp->sector_size;
 	cmd->underflow = nr_blocks << 9;
 	cmd->allowed = sdkp->max_retries;
+	/*
+	 * Increase the number of allowed retries for zoned writes if the driver
+	 * preserves the command order.
+	 */
+	if (rq->q->limits.driver_preserves_write_order &&
+	    blk_rq_is_seq_zoned_write(rq))
+		cmd->allowed += rq->q->nr_requests;
 	cmd->sdb.length = nr_blocks * sdp->sector_size;
 
 	SCSI_LOG_HLQUEUE(1,