netdev - RE: [PATCH net-next] net: mana: Add support for vlan tagging

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Date: Wed, 7 Jun 2023 20:44:57 +0000
From: Haiyang Zhang <haiyangz@...rosoft.com>
To: "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: Dexuan Cui <decui@...rosoft.com>, KY Srinivasan <kys@...rosoft.com>, Paul
 Rosswurm <paulros@...rosoft.com>, "olaf@...fle.de" <olaf@...fle.de>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>, "davem@...emloft.net"
	<davem@...emloft.net>, "wei.liu@...nel.org" <wei.liu@...nel.org>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>, "leon@...nel.org"
	<leon@...nel.org>, Long Li <longli@...rosoft.com>,
	"ssengar@...ux.microsoft.com" <ssengar@...ux.microsoft.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"daniel@...earbox.net" <daniel@...earbox.net>, "john.fastabend@...il.com"
	<john.fastabend@...il.com>, "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
	"ast@...nel.org" <ast@...nel.org>, Ajay Sharma <sharmaajay@...rosoft.com>,
	"hawk@...nel.org" <hawk@...nel.org>, "tglx@...utronix.de"
	<tglx@...utronix.de>, "shradhagupta@...ux.microsoft.com"
	<shradhagupta@...ux.microsoft.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH net-next] net: mana: Add support for vlan tagging



> -----Original Message-----
> From: LKML haiyangz <lkmlhyz@...rosoft.com> On Behalf Of Haiyang Zhang
> Sent: Wednesday, June 7, 2023 2:38 PM
> To: linux-hyperv@...r.kernel.org; netdev@...r.kernel.org
> Cc: Haiyang Zhang <haiyangz@...rosoft.com>; Dexuan Cui
> <decui@...rosoft.com>; KY Srinivasan <kys@...rosoft.com>; Paul Rosswurm
> <paulros@...rosoft.com>; olaf@...fle.de; vkuznets@...hat.com;
> davem@...emloft.net; wei.liu@...nel.org; edumazet@...gle.com;
> kuba@...nel.org; pabeni@...hat.com; leon@...nel.org; Long Li
> <longli@...rosoft.com>; ssengar@...ux.microsoft.com; linux-
> rdma@...r.kernel.org; daniel@...earbox.net; john.fastabend@...il.com;
> bpf@...r.kernel.org; ast@...nel.org; Ajay Sharma
> <sharmaajay@...rosoft.com>; hawk@...nel.org; tglx@...utronix.de;
> shradhagupta@...ux.microsoft.com; linux-kernel@...r.kernel.org
> Subject: [PATCH net-next] net: mana: Add support for vlan tagging
> 
> To support vlan, use MANA_LONG_PKT_FMT if vlan tag is present in TX
> skb. Then extract the vlan tag from the skb struct or the frame, and
> save it to tx_oob for the NIC to transmit.
> 
> For RX, extract the vlan tag from CQE and put it into skb.
> 
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> ---
>  drivers/net/ethernet/microsoft/mana/mana_en.c | 36
> +++++++++++++++++--
>  1 file changed, 34 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c
> b/drivers/net/ethernet/microsoft/mana/mana_en.c
> index d907727c7b7a..1d76ac66908c 100644
> --- a/drivers/net/ethernet/microsoft/mana/mana_en.c
> +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
> @@ -179,6 +179,31 @@ netdev_tx_t mana_start_xmit(struct sk_buff *skb,
> struct net_device *ndev)
>  		pkg.tx_oob.s_oob.short_vp_offset = txq->vp_offset;
>  	}
> 
> +	/* When using AF_PACKET we need to move VLAN header from
> +	 * the frame to the SKB struct to allow the NIC to xmit
> +	 * the 802.1Q packet.
> +	 */
> +	if (skb->protocol == htons(ETH_P_8021Q)) {
> +		u16 vlan_tci;
> +
> +		skb_reset_mac_header(skb);
> +		if (eth_type_vlan(eth_hdr(skb)->h_proto)) {
> +			if (unlikely(__skb_vlan_pop(skb, &vlan_tci)))
> +				goto tx_drop_count;
> +
> +			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
> +					       vlan_tci);
> +		}
> +	}

Not necessary to extract inband tag, because our NIC accepts inband tags too.
The change is in the next version.