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Commit f72d2f08 authored by Hoang-Nam Nguyen's avatar Hoang-Nam Nguyen Committed by Roland Dreier
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IB/ehca: Improve latency by unlocking after triggering the hardware 



Kick the hardware before unlocking the send/receive queue to overlap
processing a little more.

Signed-off-by: default avatarJoachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 8705ce5b

drivers/infiniband/hw/ehca/ehca_reqs.c

+2 −3
Original line number Diff line number Diff line
@@ -407,10 +407,9 @@ int ehca_post_send(struct ib_qp *qp, 
	} /* eof for cur_send_wr */



post_send_exit0:

	/* UNLOCK the QUEUE */

	spin_unlock_irqrestore(&my_qp->spinlock_s, flags);

	iosync(); /* serialize GAL register access */

	hipz_update_sqa(my_qp, wqe_cnt);

	spin_unlock_irqrestore(&my_qp->spinlock_s, flags);

	return ret;

}
@@ -473,9 +472,9 @@ static int internal_post_recv(struct ehca_qp *my_qp, 
	} /* eof for cur_recv_wr */



post_recv_exit0:

	spin_unlock_irqrestore(&my_qp->spinlock_r, flags);

	iosync(); /* serialize GAL register access */

	hipz_update_rqa(my_qp, wqe_cnt);

	spin_unlock_irqrestore(&my_qp->spinlock_r, flags);

	return ret;

}