netdev - Re: [PATCH net-next 1/5] net: wangxun: libwx add tx offload functions

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Message-ID: <da6a06f3-d08e-448c-9269-b6b8e0da647a@lunn.ch>
Date:   Fri, 14 Apr 2023 15:29:55 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Mengyuan Lou <mengyuanlou@...-swift.com>
Cc:     netdev@...r.kernel.org, jiawenwu@...stnetic.com
Subject: Re: [PATCH net-next 1/5] net: wangxun: libwx add tx offload functions

> +		case htons(ETH_P_1588):
> +			ptype = WX_PTYPE_L2_TS;
> +			goto exit;
> +		case htons(ETH_P_FIP):
> +			ptype = WX_PTYPE_L2_FIP;
> +			goto exit;
> +		case htons(WX_ETH_P_LLDP):
> +			ptype = WX_PTYPE_L2_LLDP;
> +			goto exit;

ETH_P_LLDP exists.

> +		case htons(WX_ETH_P_CNM):
> +			ptype = WX_PTYPE_L2_CNM;
> +			goto exit;

Is this Congestion Notification Message? Since this is part of 802.1Q,
i see no reason not to add it to if_ether.h

> +/* macro to make the table lines short */
> +#define WX_PTT(ptype, mac, ip, etype, eip, proto, layer)\
> +	      {ptype, \
> +	       1, \
> +	       WX_DEC_PTYPE_MAC_##mac,		/* mac */\
> +	       WX_DEC_PTYPE_IP_##ip,		/* ip */ \
> +	       WX_DEC_PTYPE_ETYPE_##etype,	/* etype */\
> +	       WX_DEC_PTYPE_IP_##eip,		/* eip */\
> +	       WX_DEC_PTYPE_PROT_##proto,	/* proto */\
> +	       WX_DEC_PTYPE_LAYER_##layer	/* layer */}
> +
> +#define WX_UKN(ptype) { ptype, 0, 0, 0, 0, 0, 0, 0 }
> +
> +/* Lookup table mapping the HW PTYPE to the bit field for decoding */
> +/* for ((pt=0;pt<256;pt++)); do printf "macro(0x%02X),\n" $pt; done */
> +static wx_dptype wx_ptype_lookup[256] = {
> +	WX_UKN(0x00),
> +	WX_UKN(0x01),
> +	WX_UKN(0x02),
> +	WX_UKN(0x03),
> +	WX_UKN(0x04),
> +	WX_UKN(0x05),
> +	WX_UKN(0x06),
> +	WX_UKN(0x07),
> +	WX_UKN(0x08),
> +	WX_UKN(0x09),
> +	WX_UKN(0x0A),
> +	WX_UKN(0x0B),
> +	WX_UKN(0x0C),
> +	WX_UKN(0x0D),
> +	WX_UKN(0x0E),
> +	WX_UKN(0x0F),

Since WX_UKN() is 0, you can skip them and use Designated Initializers.

https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html

	Andrew