ixgbe: ensure IPsec VF<->PF compatibility

stable inclusion
from stable-v5.10.114
commit 17f71272ef413096e0a45d18bf55e5ff6c2b7162
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5IY1V

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=17f71272ef413096e0a45d18bf55e5ff6c2b7162

--------------------------------

[ Upstream commit f049efc7 ]

The VF driver can forward any IPsec flags and such makes the function
is not extendable and prone to backward/forward incompatibility.

If new software runs on VF, it won't know that PF configured something
completely different as it "knows" only XFRM_OFFLOAD_INBOUND flag.

Fixes: eda0333a ("ixgbe: add VF IPsec management")
Reviewed-by: NRaed Salem <raeds@nvidia.com>
Signed-off-by: NLeon Romanovsky <leonro@nvidia.com>
Reviewed-by: NShannon Nelson <snelson@pensando.io>
Tested-by: NKonrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: NTony Nguyen <anthony.l.nguyen@intel.com>
Link: https://lore.kernel.org/r/20220427173152.443102-1-anthony.l.nguyen@intel.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c

@@ -903,7 +903,8 @@ int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
 	/* Tx IPsec offload doesn't seem to work on this
 	 * device, so block these requests for now.
 	 */
-	if (!(sam->flags & XFRM_OFFLOAD_INBOUND)) {
+	sam->flags = sam->flags & ~XFRM_OFFLOAD_IPV6;
+	if (sam->flags != XFRM_OFFLOAD_INBOUND) {
 		err = -EOPNOTSUPP;
 		goto err_out;
 	}