linux

ethtool: move to its own directory The ethtool netlink interface is going to be split into multiple files so that it will be more convenient to put all of them in a separate directory net/ethtool. Start by moving current ethtool.c with ioctl interface into this directory and renaming it to ioctl.c. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Acked-by: Jiri Pirko <jiri@mellanox.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>

2019-12-11 10:58:24 +01:00

ethtool: introduce ethtool netlink interface Basic genetlink and init infrastructure for the netlink interface, register genetlink family "ethtool". Add CONFIG_ETHTOOL_NETLINK Kconfig option to make the build optional. Add initial overall interface description into Documentation/networking/ethtool-netlink.rst, further patches will add more detailed information. Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>

2019-12-27 15:55:18 +01:00

ethtool: add netlink based get rss support Add netlink based support for "ethtool -x <dev> [context x]" command by implementing ETHTOOL_MSG_RSS_GET netlink message. This is equivalent to functionality provided via ETHTOOL_GRSSH in ioctl path. It sends RSS table, hash key and hash function of an interface to user space. This patch implements existing functionality available in ioctl path and enables addition of new RSS context based parameters in future. Signed-off-by: Sudheer Mogilappagari <sudheer.mogilappagari@intel.com> Link: https://lore.kernel.org/r/20221202002555.241580-1-sudheer.mogilappagari@intel.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2022-12-01 16:25:55 -08:00

ethtool: provide channel counts with CHANNELS_GET request Implement CHANNELS_GET request to get channel counts of a network device. These are traditionally available via ETHTOOL_GCHANNELS ioctl request. Omit attributes for channel types which are not supported by driver or device (zero reported for maximum). v2: (all suggested by Jakub Kicinski) - minor cleanup in channels_prepare_data() - more descriptive channels_reply_size() - omit attributes with zero max count Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Reviewed-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>

2020-03-12 21:08:38 +01:00

ethtool: add tunnel info interface Add an interface to report offloaded UDP ports via ethtool netlink. Now that core takes care of tracking which UDP tunnel ports the NICs are aware of we can quite easily export this information out to user space. The responsibility of writing the netlink dumps is split between ethtool code and udp_tunnel_nic.c - since udp_tunnel module may not always be loaded, yet we should always report the capabilities of the NIC. $ ethtool --show-tunnels eth0 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 (1): port 1230, vxlan-gpe v4: - back to v2, build fix is now directly in udp_tunnel.h v3: - don't compile ETHTOOL_MSG_TUNNEL_INFO_GET in if CONFIG_INET not set. v2: - fix string set count, - reorder enums in the uAPI, - fix type of ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES to bitset in docs and comments. Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>

2020-07-09 17:42:47 -07:00

net: ethtool: add support for MAC Merge layer The MAC merge sublayer (IEEE 802.3-2018 clause 99) is one of 2 specifications (the other being Frame Preemption; IEEE 802.1Q-2018 clause 6.7.2), which work together to minimize latency caused by frame interference at TX. The overall goal of TSN is for normal traffic and traffic with a bounded deadline to be able to cohabitate on the same L2 network and not bother each other too much. The standards achieve this (partly) by introducing the concept of preemptible traffic, i.e. Ethernet frames that have a custom value for the Start-of-Frame-Delimiter (SFD), and these frames can be fragmented and reassembled at L2 on a link-local basis. The non-preemptible frames are called express traffic, they are transmitted using a normal SFD, and they can preempt preemptible frames, therefore having lower latency, which can matter at lower (100 Mbps) link speeds, or at high MTUs (jumbo frames around 9K). Preemption is not recursive, i.e. a P frame cannot preempt another P frame. Preemption also does not depend upon priority, or otherwise said, an E frame with prio 0 will still preempt a P frame with prio 7. In terms of implementation, the standards talk about the presence of an express MAC (eMAC) which handles express traffic, and a preemptible MAC (pMAC) which handles preemptible traffic, and these MACs are multiplexed on the same MII by a MAC merge layer. To support frame preemption, the definition of the SFD was generalized to SMD (Start-of-mPacket-Delimiter), where an mPacket is essentially an Ethernet frame fragment, or a complete frame. Stations unaware of an SMD value different from the standard SFD will treat P frames as error frames. To prevent that from happening, a negotiation process is defined. On RX, packets are dispatched to the eMAC or pMAC after being filtered by their SMD. On TX, the eMAC/pMAC classification decision is taken by the 802.1Q spec, based on packet priority (each of the 8 user priority values may have an admin-status of preemptible or express). The MAC Merge layer and the Frame Preemption parameters have some degree of independence in terms of how software stacks are supposed to deal with them. The activation of the MM layer is supposed to be controlled by an LLDP daemon (after it has been communicated that the link partner also supports it), after which a (hardware-based or not) verification handshake takes place, before actually enabling the feature. So the process is intended to be relatively plug-and-play. Whereas FP settings are supposed to be coordinated across a network using something approximating NETCONF. The support contained here is exclusively for the 802.3 (MAC Merge) portions and not for the 802.1Q (Frame Preemption) parts. This API is sufficient for an LLDP daemon to do its job. The FP adminStatus variable from 802.1Q is outside the scope of an LLDP daemon. I have taken a few creative licenses and augmented the Linux kernel UAPI compared to the standard managed objects recommended by IEEE 802.3. These are: - ETHTOOL_A_MM_PMAC_ENABLED: According to Figure 99-6: Receive Processing state diagram, a MAC Merge layer is always supposed to be able to receive P frames. However, this implies keeping the pMAC powered on, which will consume needless power in applications where FP will never be used. If LLDP is used, the reception of an Additional Ethernet Capabilities TLV from the link partner is sufficient indication that the pMAC should be enabled. So my proposal is that in Linux, we keep the pMAC turned off by default and that user space turns it on when needed. - ETHTOOL_A_MM_VERIFY_ENABLED: The IEEE managed object is called aMACMergeVerifyDisableTx. I opted for consistency (positive logic) in the boolean netlink attributes offered, so this is also positive here. Other than the meaning being reversed, they correspond to the same thing. - ETHTOOL_A_MM_MAX_VERIFY_TIME: I found it most reasonable for a LLDP daemon to maximize the verifyTime variable (delay between SMD-V transmissions), to maximize its chances that the LP replies. IEEE says that the verifyTime can range between 1 and 128 ms, but the NXP ENETC stupidly keeps this variable in a 7 bit register, so the maximum supported value is 127 ms. I could have chosen to hardcode this in the LLDP daemon to a lower value, but why not let the kernel expose its supported range directly. - ETHTOOL_A_MM_TX_MIN_FRAG_SIZE: the standard managed object is called aMACMergeAddFragSize, and expresses the "additional" fragment size (on top of ETH_ZLEN), whereas this expresses the absolute value of the fragment size. - ETHTOOL_A_MM_RX_MIN_FRAG_SIZE: there doesn't appear to exist a managed object mandated by the standard, but user space clearly needs to know what is the minimum supported fragment size of our local receiver, since LLDP must advertise a value no lower than that. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>

2023-01-19 14:26:54 +02:00

net: ethtool: remove duplicated mm.o from Makefile Fixes: 2b30f8291a30 ("net: ethtool: add support for MAC Merge layer") Signed-off-by: Markus Heidelberg <m.heidelberg@cab.de> Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://patch.msgid.link/20250926131323.222192-1-m.heidelberg@cab.de Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2025-09-26 15:13:23 +02:00

ethtool: netlink: add ETHTOOL_MSG_MSE_GET and wire up PHY MSE access Introduce the userspace entry point for PHY MSE diagnostics via ethtool netlink. This exposes the core API added previously and returns both capability information and one or more snapshots. Userspace sends ETHTOOL_MSG_MSE_GET. The reply carries: - ETHTOOL_A_MSE_CAPABILITIES: scale limits and timing information - ETHTOOL_A_MSE_CHANNEL_* nests: one or more snapshots (per-channel if available, otherwise WORST, otherwise LINK) Link down returns -ENETDOWN. Changes: - YAML: add attribute sets (mse, mse-capabilities, mse-snapshot) and the mse-get operation - UAPI (generated): add ETHTOOL_A_MSE_* enums and message IDs, ETHTOOL_MSG_MSE_GET/REPLY - ethtool core: add net/ethtool/mse.c implementing the request, register genl op, and hook into ethnl dispatch - docs: document MSE_GET in ethtool-netlink.rst The include/uapi/linux/ethtool_netlink_generated.h is generated from Documentation/netlink/specs/ethtool.yaml. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Link: https://patch.msgid.link/20251027122801.982364-3-o.rempel@pengutronix.de Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2025-10-27 13:27:59 +01:00

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