[PATCH ethtool v2 0/2] support tunnel info dumping

[PATCH ethtool v2 0/2] support tunnel info dumping

[Jakub Kicinski]

Hi!

This set adds support for ETHTOOL_MSG_TUNNEL_INFO_GET.

Jakub Kicinski (2):
  update UAPI header copies
  tunnels: implement new --show-tunnels command

 Makefile.am                  |   2 +-
 ethtool.8.in                 |   9 ++
 ethtool.c                    |   5 +
 netlink/extapi.h             |   2 +
 netlink/tunnels.c            | 236 +++++++++++++++++++++++++++++++++++
 uapi/linux/ethtool.h         |  17 +++
 uapi/linux/ethtool_netlink.h |  55 ++++++++
 uapi/linux/if_link.h         | 227 ++++++++++++++++++++++++++++++---
 uapi/linux/rtnetlink.h       |  46 +++----
 9 files changed, 558 insertions(+), 41 deletions(-)
 create mode 100644 netlink/tunnels.c

-- 
2.26.2

[PATCH ethtool v2 1/2] update UAPI header copies

[Jakub Kicinski]

Update to kernel commit 4f6a5caf187f.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 uapi/linux/ethtool.h         |  17 +++
 uapi/linux/ethtool_netlink.h |  55 +++++++++
 uapi/linux/if_link.h         | 227 ++++++++++++++++++++++++++++++++---
 uapi/linux/rtnetlink.h       |  46 +++----
 4 files changed, 305 insertions(+), 40 deletions(-)

diff --git a/uapi/linux/ethtool.h b/uapi/linux/ethtool.h
index a1cfbe2ef40f..847ccd0b1fce 100644
--- a/uapi/linux/ethtool.h
+++ b/uapi/linux/ethtool.h
@@ -667,6 +667,7 @@ enum ethtool_link_ext_substate_cable_issue {
  * @ETH_SS_SOF_TIMESTAMPING: SOF_TIMESTAMPING_* flags
  * @ETH_SS_TS_TX_TYPES: timestamping Tx types
  * @ETH_SS_TS_RX_FILTERS: timestamping Rx filters
+ * @ETH_SS_UDP_TUNNEL_TYPES: UDP tunnel types
  */
 enum ethtool_stringset {
 	ETH_SS_TEST		= 0,
@@ -684,6 +685,7 @@ enum ethtool_stringset {
 	ETH_SS_SOF_TIMESTAMPING,
 	ETH_SS_TS_TX_TYPES,
 	ETH_SS_TS_RX_FILTERS,
+	ETH_SS_UDP_TUNNEL_TYPES,
 
 	/* add new constants above here */
 	ETH_SS_COUNT
@@ -1598,6 +1600,21 @@ enum ethtool_link_mode_bit_indices {
 	ETHTOOL_LINK_MODE_400000baseDR8_Full_BIT	 = 72,
 	ETHTOOL_LINK_MODE_400000baseCR8_Full_BIT	 = 73,
 	ETHTOOL_LINK_MODE_FEC_LLRS_BIT			 = 74,
+	ETHTOOL_LINK_MODE_100000baseKR_Full_BIT		 = 75,
+	ETHTOOL_LINK_MODE_100000baseSR_Full_BIT		 = 76,
+	ETHTOOL_LINK_MODE_100000baseLR_ER_FR_Full_BIT	 = 77,
+	ETHTOOL_LINK_MODE_100000baseCR_Full_BIT		 = 78,
+	ETHTOOL_LINK_MODE_100000baseDR_Full_BIT		 = 79,
+	ETHTOOL_LINK_MODE_200000baseKR2_Full_BIT	 = 80,
+	ETHTOOL_LINK_MODE_200000baseSR2_Full_BIT	 = 81,
+	ETHTOOL_LINK_MODE_200000baseLR2_ER2_FR2_Full_BIT = 82,
+	ETHTOOL_LINK_MODE_200000baseDR2_Full_BIT	 = 83,
+	ETHTOOL_LINK_MODE_200000baseCR2_Full_BIT	 = 84,
+	ETHTOOL_LINK_MODE_400000baseKR4_Full_BIT	 = 85,
+	ETHTOOL_LINK_MODE_400000baseSR4_Full_BIT	 = 86,
+	ETHTOOL_LINK_MODE_400000baseLR4_ER4_FR4_Full_BIT = 87,
+	ETHTOOL_LINK_MODE_400000baseDR4_Full_BIT	 = 88,
+	ETHTOOL_LINK_MODE_400000baseCR4_Full_BIT	 = 89,
 	/* must be last entry */
 	__ETHTOOL_LINK_MODE_MASK_NBITS
 };
diff --git a/uapi/linux/ethtool_netlink.h b/uapi/linux/ethtool_netlink.h
index 0922ca6e0d69..cebdb52e6a05 100644
--- a/uapi/linux/ethtool_netlink.h
+++ b/uapi/linux/ethtool_netlink.h
@@ -41,6 +41,7 @@ enum {
 	ETHTOOL_MSG_TSINFO_GET,
 	ETHTOOL_MSG_CABLE_TEST_ACT,
 	ETHTOOL_MSG_CABLE_TEST_TDR_ACT,
+	ETHTOOL_MSG_TUNNEL_INFO_GET,
 
 	/* add new constants above here */
 	__ETHTOOL_MSG_USER_CNT,
@@ -556,6 +557,60 @@ enum {
 	ETHTOOL_A_CABLE_TEST_TDR_NTF_MAX = __ETHTOOL_A_CABLE_TEST_TDR_NTF_CNT - 1
 };
 
+/* TUNNEL INFO */
+
+enum {
+	ETHTOOL_UDP_TUNNEL_TYPE_VXLAN,
+	ETHTOOL_UDP_TUNNEL_TYPE_GENEVE,
+	ETHTOOL_UDP_TUNNEL_TYPE_VXLAN_GPE,
+
+	__ETHTOOL_UDP_TUNNEL_TYPE_CNT
+};
+
+enum {
+	ETHTOOL_A_TUNNEL_UDP_ENTRY_UNSPEC,
+
+	ETHTOOL_A_TUNNEL_UDP_ENTRY_PORT,		/* be16 */
+	ETHTOOL_A_TUNNEL_UDP_ENTRY_TYPE,		/* u32 */
+
+	/* add new constants above here */
+	__ETHTOOL_A_TUNNEL_UDP_ENTRY_CNT,
+	ETHTOOL_A_TUNNEL_UDP_ENTRY_MAX = (__ETHTOOL_A_TUNNEL_UDP_ENTRY_CNT - 1)
+};
+
+enum {
+	ETHTOOL_A_TUNNEL_UDP_TABLE_UNSPEC,
+
+	ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE,		/* u32 */
+	ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES,		/* bitset */
+	ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY,		/* nest - _UDP_ENTRY_* */
+
+	/* add new constants above here */
+	__ETHTOOL_A_TUNNEL_UDP_TABLE_CNT,
+	ETHTOOL_A_TUNNEL_UDP_TABLE_MAX = (__ETHTOOL_A_TUNNEL_UDP_TABLE_CNT - 1)
+};
+
+enum {
+	ETHTOOL_A_TUNNEL_UDP_UNSPEC,
+
+	ETHTOOL_A_TUNNEL_UDP_TABLE,			/* nest - _UDP_TABLE_* */
+
+	/* add new constants above here */
+	__ETHTOOL_A_TUNNEL_UDP_CNT,
+	ETHTOOL_A_TUNNEL_UDP_MAX = (__ETHTOOL_A_TUNNEL_UDP_CNT - 1)
+};
+
+enum {
+	ETHTOOL_A_TUNNEL_INFO_UNSPEC,
+	ETHTOOL_A_TUNNEL_INFO_HEADER,			/* nest - _A_HEADER_* */
+
+	ETHTOOL_A_TUNNEL_INFO_UDP_PORTS,		/* nest - _UDP_TABLE */
+
+	/* add new constants above here */
+	__ETHTOOL_A_TUNNEL_INFO_CNT,
+	ETHTOOL_A_TUNNEL_INFO_MAX = (__ETHTOOL_A_TUNNEL_INFO_CNT - 1)
+};
+
 /* generic netlink info */
 #define ETHTOOL_GENL_NAME "ethtool"
 #define ETHTOOL_GENL_VERSION 1
diff --git a/uapi/linux/if_link.h b/uapi/linux/if_link.h
index a8901a39a345..9d96890f9742 100644
--- a/uapi/linux/if_link.h
+++ b/uapi/linux/if_link.h
@@ -40,26 +40,197 @@ struct rtnl_link_stats {
 	__u32	rx_nohandler;		/* dropped, no handler found	*/
 };
 
-/* The main device statistics structure */
+/**
+ * struct rtnl_link_stats64 - The main device statistics structure.
+ *
+ * @rx_packets: Number of good packets received by the interface.
+ *   For hardware interfaces counts all good packets received from the device
+ *   by the host, including packets which host had to drop at various stages
+ *   of processing (even in the driver).
+ *
+ * @tx_packets: Number of packets successfully transmitted.
+ *   For hardware interfaces counts packets which host was able to successfully
+ *   hand over to the device, which does not necessarily mean that packets
+ *   had been successfully transmitted out of the device, only that device
+ *   acknowledged it copied them out of host memory.
+ *
+ * @rx_bytes: Number of good received bytes, corresponding to @rx_packets.
+ *
+ *   For IEEE 802.3 devices should count the length of Ethernet Frames
+ *   excluding the FCS.
+ *
+ * @tx_bytes: Number of good transmitted bytes, corresponding to @tx_packets.
+ *
+ *   For IEEE 802.3 devices should count the length of Ethernet Frames
+ *   excluding the FCS.
+ *
+ * @rx_errors: Total number of bad packets received on this network device.
+ *   This counter must include events counted by @rx_length_errors,
+ *   @rx_crc_errors, @rx_frame_errors and other errors not otherwise
+ *   counted.
+ *
+ * @tx_errors: Total number of transmit problems.
+ *   This counter must include events counter by @tx_aborted_errors,
+ *   @tx_carrier_errors, @tx_fifo_errors, @tx_heartbeat_errors,
+ *   @tx_window_errors and other errors not otherwise counted.
+ *
+ * @rx_dropped: Number of packets received but not processed,
+ *   e.g. due to lack of resources or unsupported protocol.
+ *   For hardware interfaces this counter should not include packets
+ *   dropped by the device which are counted separately in
+ *   @rx_missed_errors (since procfs folds those two counters together).
+ *
+ * @tx_dropped: Number of packets dropped on their way to transmission,
+ *   e.g. due to lack of resources.
+ *
+ * @multicast: Multicast packets received.
+ *   For hardware interfaces this statistic is commonly calculated
+ *   at the device level (unlike @rx_packets) and therefore may include
+ *   packets which did not reach the host.
+ *
+ *   For IEEE 802.3 devices this counter may be equivalent to:
+ *
+ *    - 30.3.1.1.21 aMulticastFramesReceivedOK
+ *
+ * @collisions: Number of collisions during packet transmissions.
+ *
+ * @rx_length_errors: Number of packets dropped due to invalid length.
+ *   Part of aggregate "frame" errors in `/proc/net/dev`.
+ *
+ *   For IEEE 802.3 devices this counter should be equivalent to a sum
+ *   of the following attributes:
+ *
+ *    - 30.3.1.1.23 aInRangeLengthErrors
+ *    - 30.3.1.1.24 aOutOfRangeLengthField
+ *    - 30.3.1.1.25 aFrameTooLongErrors
+ *
+ * @rx_over_errors: Receiver FIFO overflow event counter.
+ *
+ *   Historically the count of overflow events. Such events may be
+ *   reported in the receive descriptors or via interrupts, and may
+ *   not correspond one-to-one with dropped packets.
+ *
+ *   The recommended interpretation for high speed interfaces is -
+ *   number of packets dropped because they did not fit into buffers
+ *   provided by the host, e.g. packets larger than MTU or next buffer
+ *   in the ring was not available for a scatter transfer.
+ *
+ *   Part of aggregate "frame" errors in `/proc/net/dev`.
+ *
+ *   This statistics was historically used interchangeably with
+ *   @rx_fifo_errors.
+ *
+ *   This statistic corresponds to hardware events and is not commonly used
+ *   on software devices.
+ *
+ * @rx_crc_errors: Number of packets received with a CRC error.
+ *   Part of aggregate "frame" errors in `/proc/net/dev`.
+ *
+ *   For IEEE 802.3 devices this counter must be equivalent to:
+ *
+ *    - 30.3.1.1.6 aFrameCheckSequenceErrors
+ *
+ * @rx_frame_errors: Receiver frame alignment errors.
+ *   Part of aggregate "frame" errors in `/proc/net/dev`.
+ *
+ *   For IEEE 802.3 devices this counter should be equivalent to:
+ *
+ *    - 30.3.1.1.7 aAlignmentErrors
+ *
+ * @rx_fifo_errors: Receiver FIFO error counter.
+ *
+ *   Historically the count of overflow events. Those events may be
+ *   reported in the receive descriptors or via interrupts, and may
+ *   not correspond one-to-one with dropped packets.
+ *
+ *   This statistics was used interchangeably with @rx_over_errors.
+ *   Not recommended for use in drivers for high speed interfaces.
+ *
+ *   This statistic is used on software devices, e.g. to count software
+ *   packet queue overflow (can) or sequencing errors (GRE).
+ *
+ * @rx_missed_errors: Count of packets missed by the host.
+ *   Folded into the "drop" counter in `/proc/net/dev`.
+ *
+ *   Counts number of packets dropped by the device due to lack
+ *   of buffer space. This usually indicates that the host interface
+ *   is slower than the network interface, or host is not keeping up
+ *   with the receive packet rate.
+ *
+ *   This statistic corresponds to hardware events and is not used
+ *   on software devices.
+ *
+ * @tx_aborted_errors:
+ *   Part of aggregate "carrier" errors in `/proc/net/dev`.
+ *   For IEEE 802.3 devices capable of half-duplex operation this counter
+ *   must be equivalent to:
+ *
+ *    - 30.3.1.1.11 aFramesAbortedDueToXSColls
+ *
+ *   High speed interfaces may use this counter as a general device
+ *   discard counter.
+ *
+ * @tx_carrier_errors: Number of frame transmission errors due to loss
+ *   of carrier during transmission.
+ *   Part of aggregate "carrier" errors in `/proc/net/dev`.
+ *
+ *   For IEEE 802.3 devices this counter must be equivalent to:
+ *
+ *    - 30.3.1.1.13 aCarrierSenseErrors
+ *
+ * @tx_fifo_errors: Number of frame transmission errors due to device
+ *   FIFO underrun / underflow. This condition occurs when the device
+ *   begins transmission of a frame but is unable to deliver the
+ *   entire frame to the transmitter in time for transmission.
+ *   Part of aggregate "carrier" errors in `/proc/net/dev`.
+ *
+ * @tx_heartbeat_errors: Number of Heartbeat / SQE Test errors for
+ *   old half-duplex Ethernet.
+ *   Part of aggregate "carrier" errors in `/proc/net/dev`.
+ *
+ *   For IEEE 802.3 devices possibly equivalent to:
+ *
+ *    - 30.3.2.1.4 aSQETestErrors
+ *
+ * @tx_window_errors: Number of frame transmission errors due
+ *   to late collisions (for Ethernet - after the first 64B of transmission).
+ *   Part of aggregate "carrier" errors in `/proc/net/dev`.
+ *
+ *   For IEEE 802.3 devices this counter must be equivalent to:
+ *
+ *    - 30.3.1.1.10 aLateCollisions
+ *
+ * @rx_compressed: Number of correctly received compressed packets.
+ *   This counters is only meaningful for interfaces which support
+ *   packet compression (e.g. CSLIP, PPP).
+ *
+ * @tx_compressed: Number of transmitted compressed packets.
+ *   This counters is only meaningful for interfaces which support
+ *   packet compression (e.g. CSLIP, PPP).
+ *
+ * @rx_nohandler: Number of packets received on the interface
+ *   but dropped by the networking stack because the device is
+ *   not designated to receive packets (e.g. backup link in a bond).
+ */
 struct rtnl_link_stats64 {
-	__u64	rx_packets;		/* total packets received	*/
-	__u64	tx_packets;		/* total packets transmitted	*/
-	__u64	rx_bytes;		/* total bytes received 	*/
-	__u64	tx_bytes;		/* total bytes transmitted	*/
-	__u64	rx_errors;		/* bad packets received		*/
-	__u64	tx_errors;		/* packet transmit problems	*/
-	__u64	rx_dropped;		/* no space in linux buffers	*/
-	__u64	tx_dropped;		/* no space available in linux	*/
-	__u64	multicast;		/* multicast packets received	*/
+	__u64	rx_packets;
+	__u64	tx_packets;
+	__u64	rx_bytes;
+	__u64	tx_bytes;
+	__u64	rx_errors;
+	__u64	tx_errors;
+	__u64	rx_dropped;
+	__u64	tx_dropped;
+	__u64	multicast;
 	__u64	collisions;
 
 	/* detailed rx_errors: */
 	__u64	rx_length_errors;
-	__u64	rx_over_errors;		/* receiver ring buff overflow	*/
-	__u64	rx_crc_errors;		/* recved pkt with crc error	*/
-	__u64	rx_frame_errors;	/* recv'd frame alignment error */
-	__u64	rx_fifo_errors;		/* recv'r fifo overrun		*/
-	__u64	rx_missed_errors;	/* receiver missed packet	*/
+	__u64	rx_over_errors;
+	__u64	rx_crc_errors;
+	__u64	rx_frame_errors;
+	__u64	rx_fifo_errors;
+	__u64	rx_missed_errors;
 
 	/* detailed tx_errors */
 	__u64	tx_aborted_errors;
@@ -71,8 +242,7 @@ struct rtnl_link_stats64 {
 	/* for cslip etc */
 	__u64	rx_compressed;
 	__u64	tx_compressed;
-
-	__u64	rx_nohandler;		/* dropped, no handler found	*/
+	__u64	rx_nohandler;
 };
 
 /* The struct should be in sync with struct ifmap */
@@ -170,12 +340,22 @@ enum {
 	IFLA_PROP_LIST,
 	IFLA_ALT_IFNAME, /* Alternative ifname */
 	IFLA_PERM_ADDRESS,
+	IFLA_PROTO_DOWN_REASON,
 	__IFLA_MAX
 };
 
 
 #define IFLA_MAX (__IFLA_MAX - 1)
 
+enum {
+	IFLA_PROTO_DOWN_REASON_UNSPEC,
+	IFLA_PROTO_DOWN_REASON_MASK,	/* u32, mask for reason bits */
+	IFLA_PROTO_DOWN_REASON_VALUE,   /* u32, reason bit value */
+
+	__IFLA_PROTO_DOWN_REASON_CNT,
+	IFLA_PROTO_DOWN_REASON_MAX = __IFLA_PROTO_DOWN_REASON_CNT - 1
+};
+
 /* backwards compatibility for userspace */
 #define IFLA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
@@ -342,6 +522,7 @@ enum {
 	IFLA_BRPORT_ISOLATED,
 	IFLA_BRPORT_BACKUP_PORT,
 	IFLA_BRPORT_MRP_RING_OPEN,
+	IFLA_BRPORT_MRP_IN_OPEN,
 	__IFLA_BRPORT_MAX
 };
 #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
@@ -904,7 +1085,14 @@ enum {
 #define IFLA_IPOIB_MAX (__IFLA_IPOIB_MAX - 1)
 
 
-/* HSR section */
+/* HSR/PRP section, both uses same interface */
+
+/* Different redundancy protocols for hsr device */
+enum {
+	HSR_PROTOCOL_HSR,
+	HSR_PROTOCOL_PRP,
+	HSR_PROTOCOL_MAX,
+};
 
 enum {
 	IFLA_HSR_UNSPEC,
@@ -914,6 +1102,9 @@ enum {
 	IFLA_HSR_SUPERVISION_ADDR,	/* Supervision frame multicast addr */
 	IFLA_HSR_SEQ_NR,
 	IFLA_HSR_VERSION,		/* HSR version */
+	IFLA_HSR_PROTOCOL,		/* Indicate different protocol than
+					 * HSR. For example PRP.
+					 */
 	__IFLA_HSR_MAX,
 };
 
diff --git a/uapi/linux/rtnetlink.h b/uapi/linux/rtnetlink.h
index bcb1ba4d0146..5ad84e663d01 100644
--- a/uapi/linux/rtnetlink.h
+++ b/uapi/linux/rtnetlink.h
@@ -257,12 +257,12 @@ enum {
 
 /* rtm_protocol */
 
-#define RTPROT_UNSPEC	0
-#define RTPROT_REDIRECT	1	/* Route installed by ICMP redirects;
-				   not used by current IPv4 */
-#define RTPROT_KERNEL	2	/* Route installed by kernel		*/
-#define RTPROT_BOOT	3	/* Route installed during boot		*/
-#define RTPROT_STATIC	4	/* Route installed by administrator	*/
+#define RTPROT_UNSPEC		0
+#define RTPROT_REDIRECT		1	/* Route installed by ICMP redirects;
+					   not used by current IPv4 */
+#define RTPROT_KERNEL		2	/* Route installed by kernel		*/
+#define RTPROT_BOOT		3	/* Route installed during boot		*/
+#define RTPROT_STATIC		4	/* Route installed by administrator	*/
 
 /* Values of protocol >= RTPROT_STATIC are not interpreted by kernel;
    they are just passed from user and back as is.
@@ -271,22 +271,23 @@ enum {
    avoid conflicts.
  */
 
-#define RTPROT_GATED	8	/* Apparently, GateD */
-#define RTPROT_RA	9	/* RDISC/ND router advertisements */
-#define RTPROT_MRT	10	/* Merit MRT */
-#define RTPROT_ZEBRA	11	/* Zebra */
-#define RTPROT_BIRD	12	/* BIRD */
-#define RTPROT_DNROUTED	13	/* DECnet routing daemon */
-#define RTPROT_XORP	14	/* XORP */
-#define RTPROT_NTK	15	/* Netsukuku */
-#define RTPROT_DHCP	16      /* DHCP client */
-#define RTPROT_MROUTED	17      /* Multicast daemon */
-#define RTPROT_BABEL	42      /* Babel daemon */
-#define RTPROT_BGP	186     /* BGP Routes */
-#define RTPROT_ISIS	187     /* ISIS Routes */
-#define RTPROT_OSPF	188     /* OSPF Routes */
-#define RTPROT_RIP	189     /* RIP Routes */
-#define RTPROT_EIGRP	192     /* EIGRP Routes */
+#define RTPROT_GATED		8	/* Apparently, GateD */
+#define RTPROT_RA		9	/* RDISC/ND router advertisements */
+#define RTPROT_MRT		10	/* Merit MRT */
+#define RTPROT_ZEBRA		11	/* Zebra */
+#define RTPROT_BIRD		12	/* BIRD */
+#define RTPROT_DNROUTED		13	/* DECnet routing daemon */
+#define RTPROT_XORP		14	/* XORP */
+#define RTPROT_NTK		15	/* Netsukuku */
+#define RTPROT_DHCP		16	/* DHCP client */
+#define RTPROT_MROUTED		17	/* Multicast daemon */
+#define RTPROT_KEEPALIVED	18	/* Keepalived daemon */
+#define RTPROT_BABEL		42	/* Babel daemon */
+#define RTPROT_BGP		186	/* BGP Routes */
+#define RTPROT_ISIS		187	/* ISIS Routes */
+#define RTPROT_OSPF		188	/* OSPF Routes */
+#define RTPROT_RIP		189	/* RIP Routes */
+#define RTPROT_EIGRP		192	/* EIGRP Routes */
 
 /* rtm_scope
 
@@ -775,6 +776,7 @@ enum {
 #define RTEXT_FILTER_BRVLAN	(1 << 1)
 #define RTEXT_FILTER_BRVLAN_COMPRESSED	(1 << 2)
 #define	RTEXT_FILTER_SKIP_STATS	(1 << 3)
+#define RTEXT_FILTER_MRP	(1 << 4)
 
 /* End of information exported to user level */
 
-- 
2.26.2

[PATCH ethtool v2 2/2] tunnels: implement new --show-tunnels command

[Jakub Kicinski]

Add support for the new show-tunnels command. Support dump.

 # ethtool --show-tunnels \*
Tunnel information for eth0:
  UDP port table 0:
    Size: 4
    Types: vxlan
    No entries
  UDP port table 1:
    Size: 4
    Types: geneve, vxlan-gpe
    Entries (2):
        port 1230, vxlan-gpe
        port 6081, geneve

v2: htons -> ntohs

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 Makefile.am       |   2 +-
 ethtool.8.in      |   9 ++
 ethtool.c         |   5 +
 netlink/extapi.h  |   2 +
 netlink/tunnels.c | 236 ++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 253 insertions(+), 1 deletion(-)
 create mode 100644 netlink/tunnels.c

diff --git a/Makefile.am b/Makefile.am
index aca0ad7bc773..0e237d070d4b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -37,7 +37,7 @@ ethtool_SOURCES += \
 		  netlink/channels.c netlink/coalesce.c netlink/pause.c \
 		  netlink/eee.c netlink/tsinfo.c \
 		  netlink/desc-ethtool.c netlink/desc-genlctrl.c \
-		  netlink/desc-rtnl.c netlink/cable_test.c \
+		  netlink/desc-rtnl.c netlink/cable_test.c netlink/tunnels.c \
 		  uapi/linux/ethtool_netlink.h \
 		  uapi/linux/netlink.h uapi/linux/genetlink.h \
 		  uapi/linux/rtnetlink.h uapi/linux/if_link.h
diff --git a/ethtool.8.in b/ethtool.8.in
index a50a4769895c..42c4767db33e 100644
--- a/ethtool.8.in
+++ b/ethtool.8.in
@@ -459,6 +459,9 @@ ethtool \- query or control network driver and hardware settings
 .BN last N
 .BN step N
 .BN pair N
+.HP
+.B ethtool \-\-show\-tunnels
+.I devname
 .
 .\" Adjust lines (i.e. full justification) and hyphenate.
 .ad
@@ -1383,6 +1386,12 @@ shown.
 If a device name is used as argument, only notification for this device are
 shown. Default is to show notifications for all devices.
 .RE
+.TP
+.B \-\-show\-tunnels
+Show tunnel-related device capabilities and state.
+List UDP ports kernel has programmed the device to parse as VxLAN,
+or GENEVE tunnels.
+.RE
 .SH BUGS
 Not supported (in part or whole) on all network drivers.
 .SH AUTHOR
diff --git a/ethtool.c b/ethtool.c
index 606af3e6b48f..23ecfcfd069c 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -5919,6 +5919,11 @@ static const struct option args[] = {
 			  "		[ step N ]\n"
 			  "		[ pair N ]\n"
 	},
+	{
+		.opts	= "--show-tunnels",
+		.nlfunc	= nl_gtunnels,
+		.help	= "Show NIC tunnel offload information",
+	},
 	{
 		.opts	= "-h|--help",
 		.no_dev	= true,
diff --git a/netlink/extapi.h b/netlink/extapi.h
index a35d5f2c0b26..9285e2325dfd 100644
--- a/netlink/extapi.h
+++ b/netlink/extapi.h
@@ -37,6 +37,7 @@ int nl_seee(struct cmd_context *ctx);
 int nl_tsinfo(struct cmd_context *ctx);
 int nl_cable_test(struct cmd_context *ctx);
 int nl_cable_test_tdr(struct cmd_context *ctx);
+int nl_gtunnels(struct cmd_context *ctx);
 int nl_monitor(struct cmd_context *ctx);
 
 void nl_monitor_usage(void);
@@ -84,6 +85,7 @@ static inline void nl_monitor_usage(void)
 #define nl_tsinfo		NULL
 #define nl_cable_test		NULL
 #define nl_cable_test_tdr	NULL
+#define nl_gtunnels		NULL
 
 #endif /* ETHTOOL_ENABLE_NETLINK */
 
diff --git a/netlink/tunnels.c b/netlink/tunnels.c
new file mode 100644
index 000000000000..b464046c021e
--- /dev/null
+++ b/netlink/tunnels.c
@@ -0,0 +1,236 @@
+/*
+ * tunnel.c - device tunnel information
+ *
+ * Implementation of "ethtool --show-tunnels <dev>"
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <arpa/inet.h>
+
+#include "../common.h"
+#include "../internal.h"
+
+#include "bitset.h"
+#include "netlink.h"
+#include "strset.h"
+
+/* TUNNEL_INFO_GET */
+
+static int
+tunnel_info_strings_load(struct nl_context *nlctx,
+			 const struct stringset **strings)
+{
+	int ret;
+
+	if (*strings)
+		return 0;
+	ret = netlink_init_ethnl2_socket(nlctx);
+	if (ret < 0)
+		return ret;
+	*strings = global_stringset(ETH_SS_UDP_TUNNEL_TYPES,
+				    nlctx->ethnl2_socket);
+	return 0;
+}
+
+static int
+tunnel_info_dump_udp_entry(struct nl_context *nlctx, const struct nlattr *entry,
+			   const struct stringset **strings)
+{
+	const struct nlattr *entry_tb[ETHTOOL_A_TUNNEL_UDP_ENTRY_MAX + 1] = {};
+	DECLARE_ATTR_TB_INFO(entry_tb);
+	const struct nlattr *attr;
+	unsigned int port, type;
+	int ret;
+
+	if (tunnel_info_strings_load(nlctx, strings))
+		return 1;
+
+	ret = mnl_attr_parse_nested(entry, attr_cb, &entry_tb_info);
+	if (ret < 0) {
+		fprintf(stderr, "malformed netlink message (udp entry)\n");
+		return 1;
+	}
+
+	attr = entry_tb[ETHTOOL_A_TUNNEL_UDP_ENTRY_PORT];
+	if (!attr || mnl_attr_validate(attr, MNL_TYPE_U16) < 0) {
+		fprintf(stderr, "malformed netlink message (port)\n");
+		return 1;
+	}
+	port = ntohs(mnl_attr_get_u16(attr));
+
+	attr = entry_tb[ETHTOOL_A_TUNNEL_UDP_ENTRY_TYPE];
+	if (!attr || mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
+		fprintf(stderr, "malformed netlink message (tunnel type)\n");
+		return 1;
+	}
+	type = mnl_attr_get_u32(attr);
+
+	printf("        port %d, %s\n", port, get_string(*strings, type));
+
+	return 0;
+}
+
+static void tunnel_info_dump_cb(unsigned int idx, const char *name, bool val,
+				void *data)
+{
+	bool *first = data;
+
+	if (!val)
+		return;
+
+	if (!*first)
+		putchar(',');
+	*first = false;
+
+	if (name)
+		printf(" %s", name);
+	else
+		printf(" bit%u", idx);
+}
+
+static int
+tunnel_info_dump_list(struct nl_context *nlctx, const struct nlattr *attr,
+		      const struct stringset **strings)
+{
+	bool first = true;
+	int ret;
+
+	if (bitset_is_empty(attr, false, &ret) || ret) {
+		if (ret)
+			return 1;
+
+		printf("    Types: none (static entries)\n");
+		return 0;
+	}
+
+	if (bitset_is_compact(attr) &&
+	    tunnel_info_strings_load(nlctx, strings))
+		return 1;
+
+	printf("    Types:");
+	ret = walk_bitset(attr, *strings, tunnel_info_dump_cb, &first);
+	putchar('\n');
+	return ret;
+}
+
+static int
+tunnel_info_dump_udp_table(const struct nlattr *table, struct nl_context *nlctx,
+			   const struct stringset **strings)
+{
+	const struct nlattr *table_tb[ETHTOOL_A_TUNNEL_UDP_TABLE_MAX + 1] = {};
+	DECLARE_ATTR_TB_INFO(table_tb);
+	const struct nlattr *attr;
+	int i, ret;
+
+	ret = mnl_attr_parse_nested(table, attr_cb, &table_tb_info);
+	if (ret < 0) {
+		fprintf(stderr, "malformed netlink message (udp table)\n");
+		return 1;
+	}
+
+	attr = table_tb[ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE];
+	if (!attr || mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
+		fprintf(stderr, "malformed netlink message (table size)\n");
+		return 1;
+	}
+	printf("    Size: %d\n", mnl_attr_get_u32(attr));
+
+	attr = table_tb[ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES];
+	if (!attr || tunnel_info_dump_list(nlctx, attr, strings)) {
+		fprintf(stderr, "malformed netlink message (types)\n");
+		return 1;
+	}
+
+	if (!table_tb[ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY]) {
+		printf("    No entries\n");
+		return 0;
+	}
+
+	i = 0;
+	mnl_attr_for_each_nested(attr, table) {
+		if (mnl_attr_get_type(attr) == ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY)
+			i++;
+	}
+
+	printf("    Entries (%d):\n", i++);
+	mnl_attr_for_each_nested(attr, table) {
+		if (mnl_attr_get_type(attr) == ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY)
+			if (tunnel_info_dump_udp_entry(nlctx, attr, strings))
+				return 1;
+	}
+
+	return 0;
+}
+
+static int
+tunnel_info_dump_udp(const struct nlattr *udp_ports, struct nl_context *nlctx)
+{
+	const struct stringset *strings = NULL;
+	const struct nlattr *table;
+	int i, err;
+
+	i = 0;
+	mnl_attr_for_each_nested(table, udp_ports) {
+		if (mnl_attr_get_type(table) != ETHTOOL_A_TUNNEL_UDP_TABLE)
+			continue;
+
+		printf("  UDP port table %d: \n", i++);
+		err = tunnel_info_dump_udp_table(table, nlctx, &strings);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int tunnel_info_reply_cb(const struct nlmsghdr *nlhdr, void *data)
+{
+	const struct nlattr *tb[ETHTOOL_A_TUNNEL_INFO_MAX + 1] = {};
+	DECLARE_ATTR_TB_INFO(tb);
+	const struct nlattr *udp_ports;
+	struct nl_context *nlctx = data;
+	bool silent;
+	int err_ret;
+	int ret;
+
+	silent = nlctx->is_dump;
+	err_ret = silent ? MNL_CB_OK : MNL_CB_ERROR;
+	ret = mnl_attr_parse(nlhdr, GENL_HDRLEN, attr_cb, &tb_info);
+	if (ret < 0)
+		return err_ret;
+	nlctx->devname = get_dev_name(tb[ETHTOOL_A_TUNNEL_INFO_HEADER]);
+	if (!dev_ok(nlctx))
+		return err_ret;
+
+	printf("Tunnel information for %s:\n", nlctx->devname);
+
+	udp_ports = tb[ETHTOOL_A_TUNNEL_INFO_UDP_PORTS];
+	if (udp_ports)
+		if (tunnel_info_dump_udp(udp_ports, nlctx))
+			return err_ret;
+
+	return MNL_CB_OK;
+}
+
+int nl_gtunnels(struct cmd_context *ctx)
+{
+	struct nl_context *nlctx = ctx->nlctx;
+	struct nl_socket *nlsk = nlctx->ethnl_socket;
+	int ret;
+
+	if (netlink_cmd_check(ctx, ETHTOOL_MSG_TUNNEL_INFO_GET, true))
+		return -EOPNOTSUPP;
+	if (ctx->argc > 0) {
+		fprintf(stderr, "ethtool: unexpected parameter '%s'\n",
+			*ctx->argp);
+		return 1;
+	}
+
+	ret = nlsock_prep_get_request(nlsk, ETHTOOL_MSG_TUNNEL_INFO_GET,
+				      ETHTOOL_A_TUNNEL_INFO_HEADER, 0);
+	if (ret < 0)
+		return ret;
+	return nlsock_send_get_request(nlsk, tunnel_info_reply_cb);
+}
-- 
2.26.2