Scsi_track_queue_full (9) Linux Manual Page

scsi_track_queue_full – track QUEUE_FULL events to adjust queue depth

Synopsis

int scsi_track_queue_full(struct scsi_device *sdev, int depth);

Arguments

sdev

SCSI Device in question

depth

Current number of outstanding SCSI commands on this device, not counting the one returned as QUEUE_FULL.

Description

This function will track successive QUEUE_FULL events on a specific SCSI device to determine if and when there is a need to adjust the queue depth on the device.

Return

0 – No change needed, >0 – Adjust queue depth to this new depth, -1 – Drop back to untagged operation using host->cmd_per_lun as the untagged command depth

Lock Status: None held on entry

Notes

Low level drivers may call this at any time and we will do “The Right Thing.” We are interrupt context safe.

Authors

James Bottomley <James.Bottomley [at] hansenpartnership.com>

Author.

Rob Landley <rob [at] landley.net>