Patch "IB/rdmavt: rdmavt can handle non aligned page maps" has been added to the 4.8-stable tree

Patch "IB/rdmavt: rdmavt can handle non aligned page maps" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    IB/rdmavt: rdmavt can handle non aligned page maps

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ib-rdmavt-rdmavt-can-handle-non-aligned-page-maps.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From e1fafdcbe0e3e769c6a83317dd845bc99b4fe61d Mon Sep 17 00:00:00 2001
From: Dennis Dalessandro <dennis.dalessandro@intel.com>
Date: Mon, 10 Oct 2016 06:14:45 -0700
Subject: IB/rdmavt: rdmavt can handle non aligned page maps

From: Dennis Dalessandro <dennis.dalessandro@intel.com>

commit e1fafdcbe0e3e769c6a83317dd845bc99b4fe61d upstream.

The initial code for rdmavt carried with it a restriction that was a
vestige from the qib driver, that to dma map a page it had to be less
than a page size. This is not the case on modern hardware, both qib and
hfi1 will be just fine with unaligned map requests.

This fixes a 4.8 regression where by an IPoIB transfer of > PAGE_SIZE
will hang because the dma map page call always fails. This was
introduced after commit 5faba5469522 ("IB/ipoib: Report SG feature
regardless of HW UD CSUM capability") added the capability to use SG by
default. Rather than override this, the HW supports it, so allow SG.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/infiniband/sw/rdmavt/dma.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/drivers/infiniband/sw/rdmavt/dma.c
+++ b/drivers/infiniband/sw/rdmavt/dma.c
@@ -90,9 +90,6 @@ static u64 rvt_dma_map_page(struct ib_de
 	if (WARN_ON(!valid_dma_direction(direction)))
 		return BAD_DMA_ADDRESS;
 
-	if (offset + size > PAGE_SIZE)
-		return BAD_DMA_ADDRESS;
-
 	addr = (u64)page_address(page);
 	if (addr)
 		addr += offset;


Patches currently in stable-queue which might be from dennis.dalessandro@intel.com are

queue-4.8/ib-hfi1-fix-rnr_timer-addition.patch
queue-4.8/ib-rdmavt-rdmavt-can-handle-non-aligned-page-maps.patch