netdev - Re: [PATCH net-next 3/4] net: hns3: replace magic numbers with macro for IPv4/v6

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Date:   Wed, 28 Sep 2022 13:34:22 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Guangbin Huang <huangguangbin2@...wei.com>
Cc:     davem@...emloft.net, kuba@...nel.org, edumazet@...gle.com,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, shenjian15@...wei.com,
        lanhao@...wei.com
Subject: Re: [PATCH net-next 3/4] net: hns3: replace magic numbers with macro
 for IPv4/v6

On Tue, Sep 27, 2022 at 07:12:04PM +0800, Guangbin Huang wrote:
> From: Hao Chen <chenhao418@...wei.com>
> 
> Replace 4/6 with IP_VERSION_V4/6 to improve code readability.
> 
> Signed-off-by: Hao Chen <chenhao418@...wei.com>
> Signed-off-by: Guangbin Huang <huangguangbin2@...wei.com>
> ---
>  drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 12 ++++++------
>  drivers/net/ethernet/hisilicon/hns3/hns3_enet.h |  3 +++
>  2 files changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> index 39b75b68474c..bf573e0c0670 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> @@ -1180,7 +1180,7 @@ static int hns3_set_tso(struct sk_buff *skb, u32 *paylen_fdop_ol4cs,
>  	/* Software should clear the IPv4's checksum field when tso is
>  	 * needed.
>  	 */
> -	if (l3.v4->version == 4)
> +	if (l3.v4->version == IP_VERSION_IPV4)
>  		l3.v4->check = 0;
>  
>  	/* tunnel packet */
> @@ -1195,7 +1195,7 @@ static int hns3_set_tso(struct sk_buff *skb, u32 *paylen_fdop_ol4cs,
>  		/* Software should clear the IPv4's checksum field when
>  		 * tso is needed.
>  		 */
> -		if (l3.v4->version == 4)
> +		if (l3.v4->version == IP_VERSION_IPV4)
>  			l3.v4->check = 0;
>  	}
>  
> @@ -1270,13 +1270,13 @@ static int hns3_get_l4_protocol(struct sk_buff *skb, u8 *ol4_proto,
>  	l3.hdr = skb_inner_network_header(skb);
>  	l4_hdr = skb_inner_transport_header(skb);
>  
> -	if (l3.v6->version == 6) {
> +	if (l3.v6->version == IP_VERSION_IPV6) {
>  		exthdr = l3.hdr + sizeof(*l3.v6);
>  		l4_proto_tmp = l3.v6->nexthdr;
>  		if (l4_hdr != exthdr)
>  			ipv6_skip_exthdr(skb, exthdr - skb->data,
>  					 &l4_proto_tmp, &frag_off);
> -	} else if (l3.v4->version == 4) {
> +	} else if (l3.v4->version == IP_VERSION_IPV4) {
>  		l4_proto_tmp = l3.v4->protocol;
>  	}
>  
> @@ -1364,7 +1364,7 @@ static void hns3_set_outer_l2l3l4(struct sk_buff *skb, u8 ol4_proto,
>  static void hns3_set_l3_type(struct sk_buff *skb, union l3_hdr_info l3,
>  			     u32 *type_cs_vlan_tso)
>  {
> -	if (l3.v4->version == 4) {
> +	if (l3.v4->version == IP_VERSION_IPV4) {
>  		hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L3T_S,
>  			       HNS3_L3T_IPV4);
>  
> @@ -1373,7 +1373,7 @@ static void hns3_set_l3_type(struct sk_buff *skb, union l3_hdr_info l3,
>  		 */
>  		if (skb_is_gso(skb))
>  			hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L3CS_B, 1);
> -	} else if (l3.v6->version == 6) {
> +	} else if (l3.v6->version == IP_VERSION_IPV6) {
>  		hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L3T_S,
>  			       HNS3_L3T_IPV6);
>  	}
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
> index 557a5fa70d0a..93041352ef19 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
> @@ -217,6 +217,9 @@ enum hns3_nic_state {
>  #define HNS3_CQ_MODE_EQE			1U
>  #define HNS3_CQ_MODE_CQE			0U
>  
> +#define IP_VERSION_IPV4				0x4
> +#define IP_VERSION_IPV6				0x6

The more traditional way is to use sa_family_t sa_family and AF_XXX instead
of your .version variable.

Thanks

> +
>  enum hns3_pkt_l2t_type {
>  	HNS3_L2_TYPE_UNICAST,
>  	HNS3_L2_TYPE_MULTICAST,
> -- 
> 2.33.0
>