netdev - Re: [PATCH] rfc: ethtool: early-orphan control (user-space)

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Date:	Sat, 11 Dec 2010 04:44:10 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	netdev@...r.kernel.org, Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH] rfc: ethtool: early-orphan control (user-space)

On Sat, 2010-12-11 at 13:13 +0900, Simon Horman wrote:
[...]
> diff --git a/ethtool.c b/ethtool.c
> index 239912b..579b4e4 100644
> --- a/ethtool.c
> +++ b/ethtool.c
> @@ -163,7 +163,8 @@ static struct option {
>  		"		[ xcvr internal|external ]\n"
>  		"		[ wol p|u|m|b|a|g|s|d... ]\n"
>  		"		[ sopass %x:%x:%x:%x:%x:%x ]\n"
> -		"		[ msglvl %d | msglvl type on|off ... ]\n" },
> +		"		[ msglvl %d | msglvl type on|off ... ]\n"
> +		"		[ early-orphan on|off ]\n" },
>      { "-a", "--show-pause", MODE_GPAUSE, "Show pause options" },
>      { "-A", "--pause", MODE_SPAUSE, "Set pause options",
>        "		[ autoneg on|off ]\n"
> @@ -411,6 +412,10 @@ static int msglvl_changed;
>  static u32 msglvl_wanted = 0;
>  static u32 msglvl_mask = 0;
>  
> +static u32 generic_flags_changed;
> +static u32 generic_flags_wanted = 0;
> +static u32 generic_flags_mask = 0;
> +
>  static enum {
>  	ONLINE=0,
>  	OFFLINE,
> @@ -608,6 +613,11 @@ static struct cmdline_info cmdline_msglvl[] = {
>  	  NETIF_MSG_WOL, &msglvl_mask },
>  };
>  
> +static struct cmdline_info cmdline_generic_flags[] = {
> +	{ "early-orphan", CMDL_FLAG, &generic_flags_wanted, NULL,
> +	  ETH_FLAG_EARLY_ORPHAN, &generic_flags_mask },
> +};
> +
>  static long long
>  get_int_range(char *str, int base, long long min, long long max)
>  {
> @@ -1125,7 +1135,13 @@ static void parse_cmdline(int argc, char **argp)
>  				}
>  				break;
>  			}
> -			show_usage(1);
> +			parse_generic_cmdline(
> +					argc, argp, i,
> +					&generic_flags_changed,
> +					cmdline_generic_flags,
> +					ARRAY_SIZE(cmdline_generic_flags));
> +			i = argc;
> +			break;

This seems to introduce an order-dependency which doesn't exist with any
of the other keyword arguments after -s.

[...]
> +       if (generic_flags_changed) {
> +               printf("generic flags changed\n");
> +               struct ethtool_value edata;
> +
> +               edata.cmd = ETHTOOL_GFLAGS;
> +               edata.data = 0;
> +               ifr->ifr_data = (caddr_t)&edata;
> +               err = ioctl(fd, SIOCETHTOOL, ifr);
> +               if (err) {
> +                       perror("Cannot get device flag settings");
> +                       return 91;
> +               }
> +
> +               edata.cmd = ETHTOOL_SFLAGS;
> +               edata.data = ((edata.data & ~generic_flags_mask) |
> +                             generic_flags_wanted);
> +
> +               err = ioctl(fd, SIOCETHTOOL, ifr);
> +               if (err)
> +                       perror("Cannot set device flag settings");
> +       }
>         return 0;
>  }
[...]

This has a silent failure case (silent to any script checking the exit
code, anyway).

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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