Improve acquisition of transaction labels.

- Keep last transaction label for each destination.
- If the next label is not free, just give up.
- This should reduce CPU load for TX on if_fwip under heavy load.

Approved by: re (hrs)

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/dev/firewire/firewirereg.h b/sys/dev/firewire/firewirereg.h
index d2d9d65..0ceb5a2 100644
--- a/sys/dev/firewire/firewirereg.h
+++ b/sys/dev/firewire/firewirereg.h
@@ -133,6 +133,7 @@ struct firewire_comm{
 	struct fw_xferq
 		*arq, *atq, *ars, *ats, *it[FW_MAX_DMACH],*ir[FW_MAX_DMACH];
 	struct fw_xferlist tlabels[0x40];
+	u_char last_tlabel[0x40];
 	STAILQ_HEAD(, fw_bind) binds;
 	STAILQ_HEAD(, fw_device) devices;
 	u_int  sid_cnt;