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RDMA/cxgb3: fail get_dma_mr on 64 bit arches

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T3 HW only supports 32 bit MRs.  If the system uses 64 bit memory
addresses, then a registered 32 bit MR will wrap and write to the
wrong memory when used with addresses > 4GB.  To prevent this,
simply fail to allocate an MR on 64 bit machines (other means
of registering memory are still available and software can still
work, we just don't allow this means of memory registration).

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Steve Wise 2015-07-22 14:14:17 -05:00 committed by Doug Ledford
parent d8b2ba7c59
commit 49fa63d8c2
1 changed files with 4 additions and 0 deletions
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4
drivers/infiniband/hw/cxgb3/iwch_provider.c
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@ -736,6 +736,10 @@ static struct ib_mr *iwch_get_dma_mr(struct ib_pd *pd, int acc)
/*
* T3 only supports 32 bits of size.
*/
if (sizeof(phys_addr_t) > 4) {
pr_warn_once(MOD "Cannot support dma_mrs on this platform.\n");
return ERR_PTR(-ENOTSUPP);
}
bl.size = 0xffffffff;
bl.addr = 0;
kva = 0;