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[PATCH 4.6 013/203] IB/mlx4: Properly initialize GRH TClass and FlowLabel in AHs

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4.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>

commit 8c5122e45a10a9262f872b53f151a592e870f905 upstream.

When this code was reworked for IBoE support the order of assignments
for the sl_tclass_flowlabel got flipped around resulting in
TClass & FlowLabel being permanently set to 0 in the packet headers.

This breaks IB routers that rely on these headers, but only affects
kernel users - libmlx4 does this properly for user space.

Fixes: fa417f7b520e ("IB/mlx4: Add support for IBoE")
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/infiniband/hw/mlx4/ah.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/hw/mlx4/ah.c
+++ b/drivers/infiniband/hw/mlx4/ah.c
@@ -47,6 +47,7 @@ static struct ib_ah *create_ib_ah(struct
 
 	ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
 	ah->av.ib.g_slid  = ah_attr->src_path_bits;
+	ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
 	if (ah_attr->ah_flags & IB_AH_GRH) {
 		ah->av.ib.g_slid   |= 0x80;
 		ah->av.ib.gid_index = ah_attr->grh.sgid_index;
@@ -64,7 +65,6 @@ static struct ib_ah *create_ib_ah(struct
 		       !(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support))
 			--ah->av.ib.stat_rate;
 	}
-	ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
 
 	return &ah->ibah;
 }

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[PATCH 4.6 000/203] 4.6.5-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:30 +0200
  [PATCH 4.6 017/203] powerpc/tm: Always reclaim in start_thread() for exec() class syscalls Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 014/203] powerpc/iommu: Remove the dependency on EEH struct in DDW mechanism Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 023/203] mnt: Account for MS_RDONLY in fs_fully_visible Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 022/203] mnt: fs_fully_visible test the proper mount for MNT_LOCKED Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 010/203] IB/core: Fix bit curruption in ib_device_cap_flags structure Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 018/203] usb: dwc2: fix regression on big-endian PowerPC/ARM systems Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 002/203] mac80211: fix fast_tx header alignment Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 012/203] IB/rdmavt: Correct qp_priv_alloc() return value test Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 019/203] USB: EHCI: declare hostpc register as zero-length array Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 013/203] IB/mlx4: Properly initialize GRH TClass and FlowLabel in AHs Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 016/203] powerpc/pseries: Fix IBM_ARCH_VEC_NRCORES_OFFSET since POWER8NVL was added Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 025/203] of: fix autoloading due to broken modalias with no compatible Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 020/203] USB: dont free bandwidth_mutex too early Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  [PATCH 4.6 015/203] powerpc/pseries: Fix PCI config address for DDW Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 00:40 +0200
  Re: [PATCH 4.6 000/203] 4.6.5-stable review Shuah Khan <shuah.kh@samsung.com> - 2016-07-26 04:10 +0200
    Re: [PATCH 4.6 000/203] 4.6.5-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 04:50 +0200
  Re: [PATCH 4.6 000/203] 4.6.5-stable review Guenter Roeck <linux@roeck-us.net> - 2016-07-26 16:00 +0200
    Re: [PATCH 4.6 000/203] 4.6.5-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-26 16:30 +0200
      Re: [PATCH 4.6 000/203] 4.6.5-stable review Guenter Roeck <linux@roeck-us.net> - 2016-07-26 17:50 +0200
  Re: [PATCH 4.6 000/203] 4.6.5-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-27 06:50 +0200

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