netdev - Re: [PATCH v2] iplink_rmnet: Allow passing IFLA_RMNET

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Date:   Mon, 27 Sep 2021 07:48:54 -0600
From:   David Ahern <dsahern@...il.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Daniele Palmas <dnlplm@...il.com>,
        Alex Elder <elder@...aro.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH v2] iplink_rmnet: Allow passing IFLA_RMNET_FLAGS

On 9/23/21 9:33 PM, Bjorn Andersson wrote:
> diff --git a/ip/iplink_rmnet.c b/ip/iplink_rmnet.c
> index 1d16440c6900..f629ca9976d9 100644
> --- a/ip/iplink_rmnet.c
> +++ b/ip/iplink_rmnet.c
> @@ -16,6 +16,12 @@ static void print_explain(FILE *f)
>  {
>  	fprintf(f,
>  		"Usage: ... rmnet mux_id MUXID\n"
> +		"                 [ingress-deaggregation { on | off } ]\n"
> +		"                 [ingress-commands { on | off } ]\n"
> +		"                 [ingress-chksumv4 { on | off } ]\n"
> +		"                 [ingress-chksumv5 { on | off } ]\n"
> +		"                 [egress-chksumv4 { on | off } ]\n"
> +		"                 [egress-chksumv5 { on | off } ]\n"
>  		"\n"
>  		"MUXID := 1-254\n"
>  	);
> @@ -26,9 +32,16 @@ static void explain(void)
>  	print_explain(stderr);
>  }
>  
> +static int on_off(const char *msg, const char *arg)
> +{
> +	fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\", not \"%s\"\n", msg, arg);
> +	return -1;
> +}
> +
>  static int rmnet_parse_opt(struct link_util *lu, int argc, char **argv,
>  			   struct nlmsghdr *n)
>  {
> +	struct ifla_rmnet_flags flags = { };
>  	__u16 mux_id;
>  
>  	while (argc > 0) {
> @@ -37,6 +50,60 @@ static int rmnet_parse_opt(struct link_util *lu, int argc, char **argv,
>  			if (get_u16(&mux_id, *argv, 0))
>  				invarg("mux_id is invalid", *argv);
>  			addattr16(n, 1024, IFLA_RMNET_MUX_ID, mux_id);
> +		} else if (matches(*argv, "ingress-deaggregation") == 0) {
> +			NEXT_ARG();
> +			flags.mask |= RMNET_FLAGS_INGRESS_DEAGGREGATION;
> +			if (strcmp(*argv, "on") == 0)
> +				flags.flags |= RMNET_FLAGS_INGRESS_DEAGGREGATION;
> +			else if (strcmp(*argv, "off") == 0)
> +				flags.flags &= ~RMNET_FLAGS_INGRESS_DEAGGREGATION;
> +			else
> +				return on_off("ingress-deaggregation", *argv);
> +		} else if (matches(*argv, "ingress-commands") == 0) {
> +			NEXT_ARG();
> +			flags.mask |= RMNET_FLAGS_INGRESS_MAP_COMMANDS;
> +			if (strcmp(*argv, "on") == 0)
> +				flags.flags |= RMNET_FLAGS_INGRESS_MAP_COMMANDS;
> +			else if (strcmp(*argv, "off") == 0)
> +				flags.flags &= ~RMNET_FLAGS_INGRESS_MAP_COMMANDS;
> +			else
> +				return on_off("ingress-commands", *argv);
> +		} else if (matches(*argv, "ingress-chksumv4") == 0) {
> +			NEXT_ARG();
> +			flags.mask |= RMNET_FLAGS_INGRESS_MAP_CKSUMV4;
> +			if (strcmp(*argv, "on") == 0)
> +				flags.flags |= RMNET_FLAGS_INGRESS_MAP_CKSUMV4;
> +			else if (strcmp(*argv, "off") == 0)
> +				flags.flags &= ~RMNET_FLAGS_INGRESS_MAP_CKSUMV4;
> +			else
> +				return on_off("ingress-chksumv4", *argv);
> +		} else if (matches(*argv, "ingress-chksumv5") == 0) {
> +			NEXT_ARG();
> +			flags.mask |= RMNET_FLAGS_INGRESS_MAP_CKSUMV5;
> +			if (strcmp(*argv, "on") == 0)
> +				flags.flags |= RMNET_FLAGS_INGRESS_MAP_CKSUMV5;
> +			else if (strcmp(*argv, "off") == 0)
> +				flags.flags &= ~RMNET_FLAGS_INGRESS_MAP_CKSUMV5;
> +			else
> +				return on_off("ingress-chksumv5", *argv);
> +		} else if (matches(*argv, "egress-chksumv4") == 0) {
> +			NEXT_ARG();
> +			flags.mask |= RMNET_FLAGS_EGRESS_MAP_CKSUMV4;
> +			if (strcmp(*argv, "on") == 0)
> +				flags.flags |= RMNET_FLAGS_EGRESS_MAP_CKSUMV4;
> +			else if (strcmp(*argv, "off") == 0)
> +				flags.flags &= ~RMNET_FLAGS_EGRESS_MAP_CKSUMV4;
> +			else
> +				return on_off("egress-chksumv4", *argv);
> +		} else if (matches(*argv, "egress-chksumv5") == 0) {
> +			NEXT_ARG();
> +			flags.mask |= RMNET_FLAGS_EGRESS_MAP_CKSUMV5;
> +			if (strcmp(*argv, "on") == 0)
> +				flags.flags |= RMNET_FLAGS_EGRESS_MAP_CKSUMV5;
> +			else if (strcmp(*argv, "off") == 0)
> +				flags.flags &= ~RMNET_FLAGS_EGRESS_MAP_CKSUMV5;
> +			else
> +				return on_off("egress-chksumv5", *argv);
>  		} else if (matches(*argv, "help") == 0) {
>  			explain();
>  			return -1;

use strcmp for new options. Also, please use 'csum' instead of 'chksum'
in the names. csum is already widely used in ip commands.