Currently, there is a potential problem that changing the content of
dev->data->dev_conf.rxmode.offloads even when there is no
vlan_offload_set driver callback.
It is a good idea that prevent the side effect and make the API return
success if no change requested. This patch fixes the problem, the detail
information as below:
- keep possibility to do dummy set even if there is no driver callback
- do not touch Rx mode offloads in device data before checking the
driver callback availability
- ensure that Rx mode offloads are rolled back correctly if driver
callback returns error
Fixes: 81f9db8ecc2c ("ethdev: add vlan offload support")
Cc: stable@dpdk.org
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Chunsong Feng <fengchunsong@huawei.com>
Signed-off-by: Min Wang (Jushui) <wangmin3@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Reviewed-by: Andrew Rybchenko <arybchenko@solarflare.com>
2e02a2afff