commit 4fdfefe52944f5c4132a372ed5c208962a73c3f2
author Andrew Vasquez <andrew.vasquez@qlogic.com> Thu Oct 27 11:09:48 2005 -0700
committer James Bottomley <jejb@mulgrave.(none)> Fri Oct 28 11:52:11 2005 -0500
tree 23e4c9cb3f899d82e07fcfc55d75744b919415e5
parent 0eedfcf0cdac30b14d1e6c99abc6604347ef0af8

[SCSI] qla2xxx: Add support to dynamically enable/disable ZIO.

ISP23xx and ISP24xx chips have support for an adaptive
method of posting SCSI command completions for multiple SCSI
commands during a single system interrupt.

SCSI commands are placed on the system response queue
without interrupting the host until 1) a delay timer
expires; or 2) a SCSI command completes with an error.

As long as the host software (qla2xxx) services the response
queue for completions (this polling is done during
queuecommand()) within the 'delay timer' period, the
firmware will not generate system interrupt.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/qla2xxx/qla_iocb.c

diff --git a/drivers/scsi/qla2xxx/qla_iocb.c b/drivers/scsi/qla2xxx/qla_iocb.c
index 37f82e2..d735562 100644
--- a/drivers/scsi/qla2xxx/qla_iocb.c
+++ b/drivers/scsi/qla2xxx/qla_iocb.c
@@ -440,6 +440,11 @@
 	WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index);
 	RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg));	/* PCI Posting. */
 
+	/* Manage unprocessed RIO/ZIO commands in response queue. */
+	if (ha->flags.process_response_queue &&
+	    ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
+		qla2x00_process_response_queue(ha);
+
 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
 	return (QLA_SUCCESS);
 
@@ -877,6 +882,11 @@
 	WRT_REG_DWORD(&reg->req_q_in, ha->req_ring_index);
 	RD_REG_DWORD_RELAXED(&reg->req_q_in);		/* PCI Posting. */
 
+	/* Manage unprocessed RIO/ZIO commands in response queue. */
+	if (ha->flags.process_response_queue &&
+	    ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
+		qla24xx_process_response_queue(ha);
+
 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
 	return QLA_SUCCESS;