| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 123/361] ixgbe: disallow IPsec Tx offload when in SR-IOV mode | Date | Sun, 11 Nov 2018 14:17:50 -0800 |
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4.19-stable review patch. If anyone has any objections, please let me know.
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From: Shannon Nelson <shannon.nelson@oracle.com>
[ Upstream commit 47b6f50077e68bcd544f657526dad4bfdce7e87d ]
There seems to be a problem in the x540's internal switch wherein if SR-IOV mode is enabled and an offloaded IPsec packet is sent to a local VF, the packet is silently dropped. This might never be a problem as it is somewhat a corner case, but if someone happens to be using IPsec offload from the PF to a VF that just happens to get migrated to the local box, communication will mysteriously fail.
Not good.
A simple way to protect from this is to simply not allow any IPsec offloads for outgoing packets when num_vfs != 0. This doesn't help any offloads that were created before SR-IOV was enabled, but we'll get to that later.
Signed-off-by: Shannon Nelson <shannon.nelson@oracle.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c @@ -676,6 +676,9 @@ static int ixgbe_ipsec_add_sa(struct xfr } else { struct tx_sa tsa; + if (adapter->num_vfs) + return -EOPNOTSUPP; + /* find the first unused index */ ret = ixgbe_ipsec_find_empty_idx(ipsec, false); if (ret < 0) {
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