Author: mav
Date: Mon Sep 14 15:21:23 2015
New Revision: 287784
URL: https://svnweb.freebsd.org/changeset/base/287784
Log:
Implement data/status aggregation for secondary HA node.
For short read requests this reduces latency by 30%, reporting command
completion after two interlink roundtrips instead of full three.
Modified:
head/sys/cam/ctl/ctl.c
Modified: head/sys/cam/ctl/ctl.c
==============================================================================
--- head/sys/cam/ctl/ctl.c Mon Sep 14 15:15:32 2015 (r287783)
+++ head/sys/cam/ctl/ctl.c Mon Sep 14 15:21:23 2015 (r287784)
@@ -978,6 +978,8 @@ ctl_isc_event_handler(ctl_ha_channel cha
* when the datamove is complete.
*/
io->io_hdr.serializing_sc = msg->hdr.serializing_sc;
+ if (msg->hdr.status == CTL_SUCCESS)
+ io->io_hdr.status = msg->hdr.status;
if (msg->dt.sg_sequence == 0) {
i = msg->dt.kern_sg_entries +
@@ -1060,6 +1062,8 @@ ctl_isc_event_handler(ctl_ha_channel cha
memcpy(&io->scsiio.sense_data,
&msg->scsi.sense_data,
msg->scsi.sense_len);
+ if (msg->hdr.status == CTL_SUCCESS)
+ io->io_hdr.flags |=
CTL_FLAG_STATUS_SENT;
}
ctl_enqueue_isc(io);
break;
@@ -12207,6 +12211,7 @@ ctl_datamove(union ctl_io *io)
msg.hdr.original_sc = io->io_hdr.original_sc;
msg.hdr.serializing_sc = io;
msg.hdr.nexus = io->io_hdr.nexus;
+ msg.hdr.status = io->io_hdr.status;
msg.dt.flags = io->io_hdr.flags;
/*
* We convert everything into a S/G list here. We can't
@@ -12590,10 +12595,12 @@ ctl_datamove_remote_xfer(union ctl_io *i
* failure.
*/
if ((rq == NULL)
- && ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE))
+ && ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE &&
+ (io->io_hdr.status & CTL_STATUS_MASK) != CTL_SUCCESS))
ctl_set_busy(&io->scsiio);
- if ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE) {
+ if ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE &&
+ (io->io_hdr.status & CTL_STATUS_MASK) != CTL_SUCCESS) {
if (rq != NULL)
ctl_dt_req_free(rq);
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