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trivial: ETHTOOL_GLINK usage explanation

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This commit is contained in:
Pavel Šimerda 2013-04-17 12:27:00 +02:00
parent b6d2ae429f
commit 0361b1ca8f
1 changed files with 8 additions and 1 deletions
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9
src/platform/nm-linux-platform.c
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@ -851,7 +851,14 @@ link_supports_carrier_detect (NMPlatform *platform, int ifindex)
const char *name = nm_platform_link_get_name (ifindex);
struct ethtool_cmd edata = { .cmd = ETHTOOL_GLINK };
/* We ignore the result and only return FALSE on error */
/* We ignore the result. If the ETHTOOL_GLINK call succeeded, then we
* assume the device supports carrier-detect, otherwise we assume it
* doesn't.
*
* We don't use ETHTOOL_GLINK for carrier detect itself, so this can
* be regarded as a hack. Instead, kernel should be able to report
* carrier detection capability via netlink.
*/
return name && ethtool_get (name, &edata);
}