From e1fafdcbe0e3e769c6a83317dd845bc99b4fe61d Mon Sep 17 00:00:00 2001 From: Dennis Dalessandro Date: Mon, 10 Oct 2016 06:14:45 -0700 Subject: [PATCH] IB/rdmavt: rdmavt can handle non aligned page maps 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. Cc: Stable # 4.8 Reviewed-by: Mike Marciniszyn Signed-off-by: Dennis Dalessandro Signed-off-by: Doug Ledford --- drivers/infiniband/sw/rdmavt/dma.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/infiniband/sw/rdmavt/dma.c b/drivers/infiniband/sw/rdmavt/dma.c index 01f71caa3ac4..f2cefb0d9180 100644 --- 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_device *dev, struct page *page, 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; -- 2.20.1