From: kib <kib@FreeBSD.org>
Date: Tue, 17 Sep 2019 18:49:13 +0000 (+0000)
Subject: Add SIOCGIFDOWNREASON.
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=465bfae22845e24b1dbfbb590d749fb63b3c15a0;p=freebsd.git

Add SIOCGIFDOWNREASON.

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
---

diff --git a/sys/net/if.c b/sys/net/if.c
index cfd0c206588..8de83b2d7bc 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -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);
diff --git a/sys/net/if.h b/sys/net/if.h
index add4df55a3d..fbcc06863bd 100644
--- a/sys/net/if.h
+++ b/sys/net/if.h
@@ -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
diff --git a/sys/sys/sockio.h b/sys/sys/sockio.h
index 89901bd40b4..447e2c88402 100644
--- a/sys/sys/sockio.h
+++ b/sys/sys/sockio.h
@@ -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_ */