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Date:      Thu, 13 Jul 2017 15:10:02 +0000 (UTC)
From:      Hans Petter Selasky <hselasky@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org
Subject:   svn commit: r320945 - stable/10/sys/ofed/drivers/net/mlx4
Message-ID:  <201707131510.v6DFA2EE023488@repo.freebsd.org>

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Author: hselasky
Date: Thu Jul 13 15:10:02 2017
New Revision: 320945
URL: https://svnweb.freebsd.org/changeset/base/320945

Log:
  MFC r320876:
  Make sure the mlx4en RX DMA ring gets stamped with software ownership
  in order to prevent the flow of QP to error in the firmware once
  UPDATE_QP is called.
  
  Sponsored by:	Mellanox Technologies

Modified:
  stable/10/sys/ofed/drivers/net/mlx4/en_rx.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/ofed/drivers/net/mlx4/en_rx.c
==============================================================================
--- stable/10/sys/ofed/drivers/net/mlx4/en_rx.c	Thu Jul 13 13:40:18 2017	(r320944)
+++ stable/10/sys/ofed/drivers/net/mlx4/en_rx.c	Thu Jul 13 15:10:02 2017	(r320945)
@@ -394,8 +394,14 @@ int mlx4_en_activate_rx_rings(struct mlx4_en_priv *pri
                 ring->rx_mb_size = priv->rx_mb_size;
 
 		ring->stride = stride;
-		if (ring->stride <= TXBB_SIZE)
+		if (ring->stride <= TXBB_SIZE) {
+			/* Stamp first unused send wqe */
+			__be32 *ptr = (__be32 *)ring->buf;
+			__be32 stamp = cpu_to_be32(1 << STAMP_SHIFT);
+			*ptr = stamp;
+			/* Move pointer to start of rx section */	
 			ring->buf += TXBB_SIZE;
+		}
 
 		ring->log_stride = ffs(ring->stride) - 1;
 		ring->buf_size = ring->size * ring->stride;



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