Ok, I'll tidy it up again.
> -----Original Message-----
> From: Yang, Qiming <qiming.y...@intel.com>
> Sent: 2022年7月7日 14:55
> To: Liu, KevinX <kevinx....@intel.com>; dev@dpdk.org
> Cc: Xing, Beilei <beilei.x...@intel.com>; Zhang, Yuying
> <yuying.zh...@intel.com>; Yang, SteveX <stevex.y...@intel.com>; Liu,
> KevinX <kevinx....@intel.com>
> Subject: RE: [PATCH] net/i40e: restore disable double VLAN by default
>
> Hi,
>
> > -----Original Message-----
> > From: Kevin Liu <kevinx....@intel.com>
> > Sent: Thursday, July 7, 2022 18:48
> > To: dev@dpdk.org
> > Cc: Xing, Beilei <beilei.x...@intel.com>; Zhang, Yuying
> > <yuying.zh...@intel.com>; Yang, SteveX <stevex.y...@intel.com>; Liu,
> > KevinX <kevinx....@intel.com>
> > Subject: [PATCH] net/i40e: restore disable double VLAN by default
> >
> > Restore disable double VLAN by default.
>
> Please add detail reason, like will caused performance drop issue.
> >
> > Fixes: ae97b8b89826 ("net/i40e: fix error disable double VLAN")
> > Signed-off-by: Kevin Liu <kevinx....@intel.com>
> > ---
> > doc/guides/nics/i40e.rst | 6 +++---
> > drivers/net/i40e/i40e_ethdev.c | 12 ------------
> > 2 files changed, 3 insertions(+), 15 deletions(-)
> >
> > diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst index
> > 85fdc4944d..f61c327726 100644
> > --- a/doc/guides/nics/i40e.rst
> > +++ b/doc/guides/nics/i40e.rst
> > @@ -969,10 +969,10 @@ it will fail and return the info "Conflict with
> > the first rule's input set", which means the current rule's input set
> > conflicts with the first rule's.
> > Remove the first rule if want to change the input set of the PCTYPE.
> >
> > -Disable QinQ is not supported when FW >= 8.4 -
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > +To use VLAN functions, need to enable QinQ when FW >= 8.4
>
> Not only this issue, you should cover all the issue we know.
>
> Vlan related feature miss when FW>=8.4
> ~~~~~~~~~~~~~
> If upgrade FW to version 8.4 and higher, some vlan related issue exist:
> 1.vlan tci input set not work
> 2.tpid set fail
> 3.need enable qinq before use vlan filter 4.outer vlan strip fail
>
> >
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > -If upgrade FW to version 8.4 and higher, enable QinQ by default and
> > disable QinQ is not supported.
> > +If upgrade FW to version 8.4 and higher, when using VLAN functions,
> > +need to
> > enable QinQ.
> >
> >
> > Example of getting best performance with l3fwd example diff --git
> > a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
> > index
> > 684e095026..117dd85c11 100644
> > --- a/drivers/net/i40e/i40e_ethdev.c
> > +++ b/drivers/net/i40e/i40e_ethdev.c
> > @@ -4027,12 +4027,6 @@ i40e_vlan_offload_set(struct rte_eth_dev *dev,
> > int
> > mask)
> > }
> >
> > if (mask & RTE_ETH_VLAN_EXTEND_MASK) {
> > - /* Double VLAN not allowed to be disabled.*/
> > - if (pf->fw8_3gt && !(rxmode->offloads &
> > RTE_ETH_RX_OFFLOAD_VLAN_EXTEND)) {
> > - PMD_DRV_LOG(WARNING,
> > - "Disable double VLAN is not allowed after
> > firmwarev8.3!");
> > - return 0;
> > - }
> > i = 0;
> > num = vsi->mac_num;
> > mac_filter = rte_zmalloc("mac_filter_info_data",
> > @@ -6296,7 +6290,6 @@ int i40e_vsi_cfg_inner_vlan_stripping(struct
> > i40e_vsi *vsi, bool on) static int i40e_dev_init_vlan(struct rte_eth_dev
> *dev) {
> > - struct i40e_pf *pf = I40E_DEV_PRIVATE_TO_PF(dev->data-
> > >dev_private);
> > struct rte_eth_dev_data *data = dev->data;
> > int ret;
> > int mask = 0;
> > @@ -6307,11 +6300,6 @@ i40e_dev_init_vlan(struct rte_eth_dev *dev)
> > RTE_ETH_VLAN_FILTER_MASK |
> > RTE_ETH_VLAN_EXTEND_MASK;
> >
> > - /* Double VLAN be enabled by default.*/
> > - if (pf->fw8_3gt) {
> > - struct rte_eth_rxmode *rxmode = &dev->data-
> > >dev_conf.rxmode;
> > - rxmode->offloads |= RTE_ETH_RX_OFFLOAD_VLAN_EXTEND;
> > - }
> > ret = i40e_vlan_offload_set(dev, mask);
> > if (ret) {
> > PMD_DRV_LOG(INFO, "Failed to update vlan offload");
> > --
> > 2.34.1
