net: aquantia: fix potential IOMMU fault after driver unbind

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[ Upstream commit 7a1bb49461 ]

IOMMU fault may occurr on unbind/bind or if_down/if_up sequence.

Although driver disables the rings on down, this is not enough.
Due to internal HW design, during subsequent initialization
NIC sometimes may reuse RX descriptors cache and write to the
host memory from the descriptor cache.
That's get catched by IOMMU on host.

This patch invalidates the descriptor cache in NIC on interface down
to prevent writing to the cached descriptors and to the memory pointed
in those descriptors.

Signed-off-by: Dmitry Bogdanov <dmitry.bogdanov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Dmitry Bogdanov 2018-11-09 11:53:57 +00:00 • committed by Greg Kroah-Hartman

parent 30d01cc8df

commit 0d70766b98

4 changed files with 35 additions and 0 deletions

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6

drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c

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8

drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh.c

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3

drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh.h

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18

drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_llh_internal.h

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