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Add SIOCGIFDOWNREASON.

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The ioctl(2) is intended to provide more details about the cause of
the down for the link.

Eventually we might define a comprehensive list of codes for the
situations.  But interface also allows the driver to provide free-form
null-terminated ASCII string to provide arbitrary non-formalized
information.  Sample implementation exists for mlx5(4), where the
string is fetched from firmware controlling the port.

Reviewed by:	hselasky, rrs
Sponsored by:	Mellanox Technologies
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D21527
This commit is contained in:
Konstantin Belousov 2019-09-17 18:49:13 +00:00
parent 6fd583583b
commit 247cf5664e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=352458
3 changed files with 13 additions and 0 deletions
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1
sys/net/if.c
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@ -2891,6 +2891,7 @@ ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
case SIOCGIFGENERIC:
case SIOCGIFRSSKEY:
case SIOCGIFRSSHASH:
case SIOCGIFDOWNREASON:
if (ifp->if_ioctl == NULL)
return (EOPNOTSUPP);
error = (*ifp->if_ioctl)(ifp, cmd, data);

10
sys/net/if.h
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@ -585,6 +585,16 @@ struct ifrsshash {
#define IFNET_PCP_NONE 0xff /* PCP disabled */
#define IFDR_MSG_SIZE 64
#define IFDR_REASON_MSG 1
#define IFDR_REASON_VENDOR 2
struct ifdownreason {
char ifdr_name[IFNAMSIZ];
uint32_t ifdr_reason;
uint32_t ifdr_vendor;
char ifdr_msg[IFDR_MSG_SIZE];
};
#endif /* __BSD_VISIBLE */
#ifdef _KERNEL

2
sys/sys/sockio.h
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@ -143,4 +143,6 @@
#define SIOCGLANPCP _IOWR('i', 152, struct ifreq) /* Get (V)LAN PCP */
#define SIOCSLANPCP _IOW('i', 153, struct ifreq) /* Set (V)LAN PCP */
#define SIOCGIFDOWNREASON _IOWR('i', 154, struct ifdownreason)
#endif /* !_SYS_SOCKIO_H_ */