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| author | Dennis Dalessandro <dennis.dalessandro@intel.com> | 2016-10-10 15:14:45 +0200 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2016-11-15 22:16:40 +0100 |
| commit | e1fafdcbe0e3e769c6a83317dd845bc99b4fe61d (patch) | |
| tree | 63e6e64282e79d02feafcd956e2573bdea7d5208 /drivers | |
| parent | Linux 4.9-rc3 (diff) | |
| download | linux-e1fafdcbe0e3e769c6a83317dd845bc99b4fe61d.tar.xz linux-e1fafdcbe0e3e769c6a83317dd845bc99b4fe61d.zip | |
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 <stable@vger.kernel.org> # 4.8
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/infiniband/sw/rdmavt/dma.c | 3 |
1 files changed, 0 insertions, 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; |