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

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 <[email protected]> know about it.

From: Dennis Dalessandro <[email protected]>
Date: Mon, 10 Oct 2016 06:14:45 -0700
Subject: IB/rdmavt: rdmavt can handle non aligned page maps

From: Dennis Dalessandro <[email protected]>

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.

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

@@ -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 [email protected] are

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