[PATCH net-next v3 0/5] ethtool netlink interface, preliminary part

[PATCH net-next v3 0/5] ethtool netlink interface, preliminary part

[Michal Kubecek]

As Jakub Kicinski suggested in ethtool netlink v7 discussion, this
submission consists only of preliminary patches which raised no objections;
first four patches already have Acked-by or Reviewed-by.

- patch 1 exposes permanent hardware address (as shown by "ethtool -P")
  via rtnetlink
- patch 2 is renames existing netlink helper to a better name
- patch 3 and 4 reorganize existing ethtool code (no functional change)
- patch 5 makes the table of link mode names available as an ethtool string
  set (will be needed for the netlink interface) 

Once we get these out of the way, v8 of the first part of the ethtool
netlink interface will follow.

Changes from v2 to v3: fix SPDX licence identifiers (patch 3 and 5).

Changes from v1 to v2: restore build time check that all link modes have
assigned a name (patch 5).

Michal Kubecek (5):
  rtnetlink: provide permanent hardware address in RTM_NEWLINK
  netlink: rename nl80211_validate_nested() to nla_validate_nested()
  ethtool: move to its own directory
  ethtool: move string arrays into common file
  ethtool: provide link mode names as a string set

 include/net/netlink.h                   |   8 +-
 include/uapi/linux/ethtool.h            |   2 +
 include/uapi/linux/if_link.h            |   1 +
 net/Makefile                            |   2 +-
 net/core/Makefile                       |   2 +-
 net/core/rtnetlink.c                    |   5 +
 net/ethtool/Makefile                    |   3 +
 net/ethtool/common.c                    | 171 ++++++++++++++++++++++++
 net/ethtool/common.h                    |  22 +++
 net/{core/ethtool.c => ethtool/ioctl.c} |  90 ++-----------
 net/wireless/nl80211.c                  |   3 +-
 11 files changed, 219 insertions(+), 90 deletions(-)
 create mode 100644 net/ethtool/Makefile
 create mode 100644 net/ethtool/common.c
 create mode 100644 net/ethtool/common.h
 rename net/{core/ethtool.c => ethtool/ioctl.c} (95%)

-- 
2.24.0

[PATCH net-next v3 1/5] rtnetlink: provide permanent hardware address in RTM_NEWLINK

[Michal Kubecek]

Permanent hardware address of a network device was traditionally provided
via ethtool ioctl interface but as Jiri Pirko pointed out in a review of
ethtool netlink interface, rtnetlink is much more suitable for it so let's
add it to the RTM_NEWLINK message.

Add IFLA_PERM_ADDRESS attribute to RTM_NEWLINK messages unless the
permanent address is all zeros (i.e. device driver did not fill it). As
permanent address is not modifiable, reject userspace requests containing
IFLA_PERM_ADDRESS attribute.

Note: we already provide permanent hardware address for bond slaves;
unfortunately we cannot drop that attribute for backward compatibility
reasons.

v5 -> v6: only add the attribute if permanent address is not zero

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
---
 include/uapi/linux/if_link.h | 1 +
 net/core/rtnetlink.c         | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 8aec8769d944..1d69f637c5d6 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -169,6 +169,7 @@ enum {
 	IFLA_MAX_MTU,
 	IFLA_PROP_LIST,
 	IFLA_ALT_IFNAME, /* Alternative ifname */
+	IFLA_PERM_ADDRESS,
 	__IFLA_MAX
 };
 
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 02916f43bf63..20bc406f3871 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1041,6 +1041,7 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
 	       + nla_total_size(4)  /* IFLA_MIN_MTU */
 	       + nla_total_size(4)  /* IFLA_MAX_MTU */
 	       + rtnl_prop_list_size(dev)
+	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */
 	       + 0;
 }
 
@@ -1757,6 +1758,9 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
 	    nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
 		goto nla_put_failure;
 
+	if (memchr_inv(dev->perm_addr, '\0', dev->addr_len) &&
+	    nla_put(skb, IFLA_PERM_ADDRESS, dev->addr_len, dev->perm_addr))
+		goto nla_put_failure;
 
 	rcu_read_lock();
 	if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
@@ -1822,6 +1826,7 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
 	[IFLA_PROP_LIST]	= { .type = NLA_NESTED },
 	[IFLA_ALT_IFNAME]	= { .type = NLA_STRING,
 				    .len = ALTIFNAMSIZ - 1 },
+	[IFLA_PERM_ADDRESS]	= { .type = NLA_REJECT },
 };
 
 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
-- 
2.24.0

[PATCH net-next v3 2/5] netlink: rename nl80211_validate_nested() to nla_validate_nested()

[Michal Kubecek]

Function nl80211_validate_nested() is not specific to nl80211, it's
a counterpart to nla_validate_nested_deprecated() with strict validation.
For consistency with other validation and parse functions, rename it to
nla_validate_nested().

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
---
 include/net/netlink.h  | 8 ++++----
 net/wireless/nl80211.c | 3 +--
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/include/net/netlink.h b/include/net/netlink.h
index b140c8f1be22..56c365dc6dc7 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -1735,7 +1735,7 @@ static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start)
 }
 
 /**
- * nla_validate_nested - Validate a stream of nested attributes
+ * __nla_validate_nested - Validate a stream of nested attributes
  * @start: container attribute
  * @maxtype: maximum attribute type to be expected
  * @policy: validation policy
@@ -1758,9 +1758,9 @@ static inline int __nla_validate_nested(const struct nlattr *start, int maxtype,
 }
 
 static inline int
-nl80211_validate_nested(const struct nlattr *start, int maxtype,
-			const struct nla_policy *policy,
-			struct netlink_ext_ack *extack)
+nla_validate_nested(const struct nlattr *start, int maxtype,
+		    const struct nla_policy *policy,
+		    struct netlink_ext_ack *extack)
 {
 	return __nla_validate_nested(start, maxtype, policy,
 				     NL_VALIDATE_STRICT, extack);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index da5262b2298b..fa3526592c51 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -12900,8 +12900,7 @@ static int nl80211_vendor_check_policy(const struct wiphy_vendor_command *vcmd,
 		return -EINVAL;
 	}
 
-	return nl80211_validate_nested(attr, vcmd->maxattr, vcmd->policy,
-				       extack);
+	return nla_validate_nested(attr, vcmd->maxattr, vcmd->policy, extack);
 }
 
 static int nl80211_vendor_cmd(struct sk_buff *skb, struct genl_info *info)
-- 
2.24.0

[PATCH net-next v3 3/5] ethtool: move to its own directory

[Michal Kubecek]

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>
---
 net/Makefile                            | 2 +-
 net/core/Makefile                       | 2 +-
 net/ethtool/Makefile                    | 3 +++
 net/{core/ethtool.c => ethtool/ioctl.c} | 0
 4 files changed, 5 insertions(+), 2 deletions(-)
 create mode 100644 net/ethtool/Makefile
 rename net/{core/ethtool.c => ethtool/ioctl.c} (100%)

diff --git a/net/Makefile b/net/Makefile
index 449fc0b221f8..848303d98d3d 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -13,7 +13,7 @@ obj-$(CONFIG_NET)		+= $(tmp-y)
 
 # LLC has to be linked before the files in net/802/
 obj-$(CONFIG_LLC)		+= llc/
-obj-$(CONFIG_NET)		+= ethernet/ 802/ sched/ netlink/ bpf/
+obj-$(CONFIG_NET)		+= ethernet/ 802/ sched/ netlink/ bpf/ ethtool/
 obj-$(CONFIG_NETFILTER)		+= netfilter/
 obj-$(CONFIG_INET)		+= ipv4/
 obj-$(CONFIG_TLS)		+= tls/
diff --git a/net/core/Makefile b/net/core/Makefile
index a104dc8faafc..3e2c378e5f31 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -8,7 +8,7 @@ obj-y := sock.o request_sock.o skbuff.o datagram.o stream.o scm.o \
 
 obj-$(CONFIG_SYSCTL) += sysctl_net_core.o
 
-obj-y		     += dev.o ethtool.o dev_addr_lists.o dst.o netevent.o \
+obj-y		     += dev.o dev_addr_lists.o dst.o netevent.o \
 			neighbour.o rtnetlink.o utils.o link_watch.o filter.o \
 			sock_diag.o dev_ioctl.o tso.o sock_reuseport.o \
 			fib_notifier.o xdp.o flow_offload.o
diff --git a/net/ethtool/Makefile b/net/ethtool/Makefile
new file mode 100644
index 000000000000..7e5c9eb85c90
--- /dev/null
+++ b/net/ethtool/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-y		+= ioctl.o
diff --git a/net/core/ethtool.c b/net/ethtool/ioctl.c
similarity index 100%
rename from net/core/ethtool.c
rename to net/ethtool/ioctl.c
-- 
2.24.0

[PATCH net-next v3 4/5] ethtool: move string arrays into common file

[Michal Kubecek]

Introduce file net/ethtool/common.c for code shared by ioctl and netlink
ethtool interface. Move name tables of features, RSS hash functions,
tunables and PHY tunables into this file.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
---
 net/ethtool/Makefile |  2 +-
 net/ethtool/common.c | 85 ++++++++++++++++++++++++++++++++++++++++++++
 net/ethtool/common.h | 17 +++++++++
 net/ethtool/ioctl.c  | 84 ++-----------------------------------------
 4 files changed, 105 insertions(+), 83 deletions(-)
 create mode 100644 net/ethtool/common.c
 create mode 100644 net/ethtool/common.h

diff --git a/net/ethtool/Makefile b/net/ethtool/Makefile
index 7e5c9eb85c90..f68387618973 100644
--- a/net/ethtool/Makefile
+++ b/net/ethtool/Makefile
@@ -1,3 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
-obj-y		+= ioctl.o
+obj-y		+= ioctl.o common.o
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
new file mode 100644
index 000000000000..8b5e11e7e0a6
--- /dev/null
+++ b/net/ethtool/common.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "common.h"
+
+const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
+	[NETIF_F_SG_BIT] =               "tx-scatter-gather",
+	[NETIF_F_IP_CSUM_BIT] =          "tx-checksum-ipv4",
+	[NETIF_F_HW_CSUM_BIT] =          "tx-checksum-ip-generic",
+	[NETIF_F_IPV6_CSUM_BIT] =        "tx-checksum-ipv6",
+	[NETIF_F_HIGHDMA_BIT] =          "highdma",
+	[NETIF_F_FRAGLIST_BIT] =         "tx-scatter-gather-fraglist",
+	[NETIF_F_HW_VLAN_CTAG_TX_BIT] =  "tx-vlan-hw-insert",
+
+	[NETIF_F_HW_VLAN_CTAG_RX_BIT] =  "rx-vlan-hw-parse",
+	[NETIF_F_HW_VLAN_CTAG_FILTER_BIT] = "rx-vlan-filter",
+	[NETIF_F_HW_VLAN_STAG_TX_BIT] =  "tx-vlan-stag-hw-insert",
+	[NETIF_F_HW_VLAN_STAG_RX_BIT] =  "rx-vlan-stag-hw-parse",
+	[NETIF_F_HW_VLAN_STAG_FILTER_BIT] = "rx-vlan-stag-filter",
+	[NETIF_F_VLAN_CHALLENGED_BIT] =  "vlan-challenged",
+	[NETIF_F_GSO_BIT] =              "tx-generic-segmentation",
+	[NETIF_F_LLTX_BIT] =             "tx-lockless",
+	[NETIF_F_NETNS_LOCAL_BIT] =      "netns-local",
+	[NETIF_F_GRO_BIT] =              "rx-gro",
+	[NETIF_F_GRO_HW_BIT] =           "rx-gro-hw",
+	[NETIF_F_LRO_BIT] =              "rx-lro",
+
+	[NETIF_F_TSO_BIT] =              "tx-tcp-segmentation",
+	[NETIF_F_GSO_ROBUST_BIT] =       "tx-gso-robust",
+	[NETIF_F_TSO_ECN_BIT] =          "tx-tcp-ecn-segmentation",
+	[NETIF_F_TSO_MANGLEID_BIT] =	 "tx-tcp-mangleid-segmentation",
+	[NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
+	[NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
+	[NETIF_F_GSO_GRE_BIT] =		 "tx-gre-segmentation",
+	[NETIF_F_GSO_GRE_CSUM_BIT] =	 "tx-gre-csum-segmentation",
+	[NETIF_F_GSO_IPXIP4_BIT] =	 "tx-ipxip4-segmentation",
+	[NETIF_F_GSO_IPXIP6_BIT] =	 "tx-ipxip6-segmentation",
+	[NETIF_F_GSO_UDP_TUNNEL_BIT] =	 "tx-udp_tnl-segmentation",
+	[NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT] = "tx-udp_tnl-csum-segmentation",
+	[NETIF_F_GSO_PARTIAL_BIT] =	 "tx-gso-partial",
+	[NETIF_F_GSO_SCTP_BIT] =	 "tx-sctp-segmentation",
+	[NETIF_F_GSO_ESP_BIT] =		 "tx-esp-segmentation",
+	[NETIF_F_GSO_UDP_L4_BIT] =	 "tx-udp-segmentation",
+
+	[NETIF_F_FCOE_CRC_BIT] =         "tx-checksum-fcoe-crc",
+	[NETIF_F_SCTP_CRC_BIT] =        "tx-checksum-sctp",
+	[NETIF_F_FCOE_MTU_BIT] =         "fcoe-mtu",
+	[NETIF_F_NTUPLE_BIT] =           "rx-ntuple-filter",
+	[NETIF_F_RXHASH_BIT] =           "rx-hashing",
+	[NETIF_F_RXCSUM_BIT] =           "rx-checksum",
+	[NETIF_F_NOCACHE_COPY_BIT] =     "tx-nocache-copy",
+	[NETIF_F_LOOPBACK_BIT] =         "loopback",
+	[NETIF_F_RXFCS_BIT] =            "rx-fcs",
+	[NETIF_F_RXALL_BIT] =            "rx-all",
+	[NETIF_F_HW_L2FW_DOFFLOAD_BIT] = "l2-fwd-offload",
+	[NETIF_F_HW_TC_BIT] =		 "hw-tc-offload",
+	[NETIF_F_HW_ESP_BIT] =		 "esp-hw-offload",
+	[NETIF_F_HW_ESP_TX_CSUM_BIT] =	 "esp-tx-csum-hw-offload",
+	[NETIF_F_RX_UDP_TUNNEL_PORT_BIT] =	 "rx-udp_tunnel-port-offload",
+	[NETIF_F_HW_TLS_RECORD_BIT] =	"tls-hw-record",
+	[NETIF_F_HW_TLS_TX_BIT] =	 "tls-hw-tx-offload",
+	[NETIF_F_HW_TLS_RX_BIT] =	 "tls-hw-rx-offload",
+};
+
+const char
+rss_hash_func_strings[ETH_RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN] = {
+	[ETH_RSS_HASH_TOP_BIT] =	"toeplitz",
+	[ETH_RSS_HASH_XOR_BIT] =	"xor",
+	[ETH_RSS_HASH_CRC32_BIT] =	"crc32",
+};
+
+const char
+tunable_strings[__ETHTOOL_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
+	[ETHTOOL_ID_UNSPEC]     = "Unspec",
+	[ETHTOOL_RX_COPYBREAK]	= "rx-copybreak",
+	[ETHTOOL_TX_COPYBREAK]	= "tx-copybreak",
+	[ETHTOOL_PFC_PREVENTION_TOUT] = "pfc-prevention-tout",
+};
+
+const char
+phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
+	[ETHTOOL_ID_UNSPEC]     = "Unspec",
+	[ETHTOOL_PHY_DOWNSHIFT]	= "phy-downshift",
+	[ETHTOOL_PHY_FAST_LINK_DOWN] = "phy-fast-link-down",
+	[ETHTOOL_PHY_EDPD]	= "phy-energy-detect-power-down",
+};
diff --git a/net/ethtool/common.h b/net/ethtool/common.h
new file mode 100644
index 000000000000..336566430be4
--- /dev/null
+++ b/net/ethtool/common.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _ETHTOOL_COMMON_H
+#define _ETHTOOL_COMMON_H
+
+#include <linux/ethtool.h>
+
+extern const char
+netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN];
+extern const char
+rss_hash_func_strings[ETH_RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN];
+extern const char
+tunable_strings[__ETHTOOL_TUNABLE_COUNT][ETH_GSTRING_LEN];
+extern const char
+phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN];
+
+#endif /* _ETHTOOL_COMMON_H */
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index cd9bc67381b2..b262db5a1d91 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -27,6 +27,8 @@
 #include <net/xdp_sock.h>
 #include <net/flow_offload.h>
 
+#include "common.h"
+
 /*
  * Some useful ethtool_ops methods that're device independent.
  * If we find that all drivers want to do the same thing here,
@@ -54,88 +56,6 @@ EXPORT_SYMBOL(ethtool_op_get_ts_info);
 
 #define ETHTOOL_DEV_FEATURE_WORDS	((NETDEV_FEATURE_COUNT + 31) / 32)
 
-static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
-	[NETIF_F_SG_BIT] =               "tx-scatter-gather",
-	[NETIF_F_IP_CSUM_BIT] =          "tx-checksum-ipv4",
-	[NETIF_F_HW_CSUM_BIT] =          "tx-checksum-ip-generic",
-	[NETIF_F_IPV6_CSUM_BIT] =        "tx-checksum-ipv6",
-	[NETIF_F_HIGHDMA_BIT] =          "highdma",
-	[NETIF_F_FRAGLIST_BIT] =         "tx-scatter-gather-fraglist",
-	[NETIF_F_HW_VLAN_CTAG_TX_BIT] =  "tx-vlan-hw-insert",
-
-	[NETIF_F_HW_VLAN_CTAG_RX_BIT] =  "rx-vlan-hw-parse",
-	[NETIF_F_HW_VLAN_CTAG_FILTER_BIT] = "rx-vlan-filter",
-	[NETIF_F_HW_VLAN_STAG_TX_BIT] =  "tx-vlan-stag-hw-insert",
-	[NETIF_F_HW_VLAN_STAG_RX_BIT] =  "rx-vlan-stag-hw-parse",
-	[NETIF_F_HW_VLAN_STAG_FILTER_BIT] = "rx-vlan-stag-filter",
-	[NETIF_F_VLAN_CHALLENGED_BIT] =  "vlan-challenged",
-	[NETIF_F_GSO_BIT] =              "tx-generic-segmentation",
-	[NETIF_F_LLTX_BIT] =             "tx-lockless",
-	[NETIF_F_NETNS_LOCAL_BIT] =      "netns-local",
-	[NETIF_F_GRO_BIT] =              "rx-gro",
-	[NETIF_F_GRO_HW_BIT] =           "rx-gro-hw",
-	[NETIF_F_LRO_BIT] =              "rx-lro",
-
-	[NETIF_F_TSO_BIT] =              "tx-tcp-segmentation",
-	[NETIF_F_GSO_ROBUST_BIT] =       "tx-gso-robust",
-	[NETIF_F_TSO_ECN_BIT] =          "tx-tcp-ecn-segmentation",
-	[NETIF_F_TSO_MANGLEID_BIT] =	 "tx-tcp-mangleid-segmentation",
-	[NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
-	[NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
-	[NETIF_F_GSO_GRE_BIT] =		 "tx-gre-segmentation",
-	[NETIF_F_GSO_GRE_CSUM_BIT] =	 "tx-gre-csum-segmentation",
-	[NETIF_F_GSO_IPXIP4_BIT] =	 "tx-ipxip4-segmentation",
-	[NETIF_F_GSO_IPXIP6_BIT] =	 "tx-ipxip6-segmentation",
-	[NETIF_F_GSO_UDP_TUNNEL_BIT] =	 "tx-udp_tnl-segmentation",
-	[NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT] = "tx-udp_tnl-csum-segmentation",
-	[NETIF_F_GSO_PARTIAL_BIT] =	 "tx-gso-partial",
-	[NETIF_F_GSO_SCTP_BIT] =	 "tx-sctp-segmentation",
-	[NETIF_F_GSO_ESP_BIT] =		 "tx-esp-segmentation",
-	[NETIF_F_GSO_UDP_L4_BIT] =	 "tx-udp-segmentation",
-
-	[NETIF_F_FCOE_CRC_BIT] =         "tx-checksum-fcoe-crc",
-	[NETIF_F_SCTP_CRC_BIT] =        "tx-checksum-sctp",
-	[NETIF_F_FCOE_MTU_BIT] =         "fcoe-mtu",
-	[NETIF_F_NTUPLE_BIT] =           "rx-ntuple-filter",
-	[NETIF_F_RXHASH_BIT] =           "rx-hashing",
-	[NETIF_F_RXCSUM_BIT] =           "rx-checksum",
-	[NETIF_F_NOCACHE_COPY_BIT] =     "tx-nocache-copy",
-	[NETIF_F_LOOPBACK_BIT] =         "loopback",
-	[NETIF_F_RXFCS_BIT] =            "rx-fcs",
-	[NETIF_F_RXALL_BIT] =            "rx-all",
-	[NETIF_F_HW_L2FW_DOFFLOAD_BIT] = "l2-fwd-offload",
-	[NETIF_F_HW_TC_BIT] =		 "hw-tc-offload",
-	[NETIF_F_HW_ESP_BIT] =		 "esp-hw-offload",
-	[NETIF_F_HW_ESP_TX_CSUM_BIT] =	 "esp-tx-csum-hw-offload",
-	[NETIF_F_RX_UDP_TUNNEL_PORT_BIT] =	 "rx-udp_tunnel-port-offload",
-	[NETIF_F_HW_TLS_RECORD_BIT] =	"tls-hw-record",
-	[NETIF_F_HW_TLS_TX_BIT] =	 "tls-hw-tx-offload",
-	[NETIF_F_HW_TLS_RX_BIT] =	 "tls-hw-rx-offload",
-};
-
-static const char
-rss_hash_func_strings[ETH_RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN] = {
-	[ETH_RSS_HASH_TOP_BIT] =	"toeplitz",
-	[ETH_RSS_HASH_XOR_BIT] =	"xor",
-	[ETH_RSS_HASH_CRC32_BIT] =	"crc32",
-};
-
-static const char
-tunable_strings[__ETHTOOL_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
-	[ETHTOOL_ID_UNSPEC]     = "Unspec",
-	[ETHTOOL_RX_COPYBREAK]	= "rx-copybreak",
-	[ETHTOOL_TX_COPYBREAK]	= "tx-copybreak",
-	[ETHTOOL_PFC_PREVENTION_TOUT] = "pfc-prevention-tout",
-};
-
-static const char
-phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
-	[ETHTOOL_ID_UNSPEC]     = "Unspec",
-	[ETHTOOL_PHY_DOWNSHIFT]	= "phy-downshift",
-	[ETHTOOL_PHY_FAST_LINK_DOWN] = "phy-fast-link-down",
-	[ETHTOOL_PHY_EDPD]	= "phy-energy-detect-power-down",
-};
-
 static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
 {
 	struct ethtool_gfeatures cmd = {
-- 
2.24.0

[PATCH net-next v3 5/5] ethtool: provide link mode names as a string set

[Michal Kubecek]

Unlike e.g. netdev features, the ethtool ioctl interface requires link mode
table to be in sync between kernel and userspace for userspace to be able
to display and set all link modes supported by kernel. The way arbitrary
length bitsets are implemented in netlink interface, this will be no longer
needed.

To allow userspace to access all link modes running kernel supports, add
table of ethernet link mode names and make it available as a string set to
userspace GET_STRSET requests. Add build time check to make sure names
are defined for all modes declared in enum ethtool_link_mode_bit_indices.

Once the string set is available, make it also accessible via ioctl.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
---
 include/uapi/linux/ethtool.h |  2 +
 net/ethtool/common.c         | 86 ++++++++++++++++++++++++++++++++++++
 net/ethtool/common.h         |  5 +++
 net/ethtool/ioctl.c          |  6 +++
 4 files changed, 99 insertions(+)

diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index d4591792f0b4..f44155840b07 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -593,6 +593,7 @@ struct ethtool_pauseparam {
  * @ETH_SS_RSS_HASH_FUNCS: RSS hush function names
  * @ETH_SS_PHY_STATS: Statistic names, for use with %ETHTOOL_GPHYSTATS
  * @ETH_SS_PHY_TUNABLES: PHY tunable names
+ * @ETH_SS_LINK_MODES: link mode names
  */
 enum ethtool_stringset {
 	ETH_SS_TEST		= 0,
@@ -604,6 +605,7 @@ enum ethtool_stringset {
 	ETH_SS_TUNABLES,
 	ETH_SS_PHY_STATS,
 	ETH_SS_PHY_TUNABLES,
+	ETH_SS_LINK_MODES,
 };
 
 /**
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index 8b5e11e7e0a6..0a8728565356 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -83,3 +83,89 @@ phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
 	[ETHTOOL_PHY_FAST_LINK_DOWN] = "phy-fast-link-down",
 	[ETHTOOL_PHY_EDPD]	= "phy-energy-detect-power-down",
 };
+
+#define __LINK_MODE_NAME(speed, type, duplex) \
+	#speed "base" #type "/" #duplex
+#define __DEFINE_LINK_MODE_NAME(speed, type, duplex) \
+	[ETHTOOL_LINK_MODE(speed, type, duplex)] = \
+	__LINK_MODE_NAME(speed, type, duplex)
+#define __DEFINE_SPECIAL_MODE_NAME(_mode, _name) \
+	[ETHTOOL_LINK_MODE_ ## _mode ## _BIT] = _name
+
+const char link_mode_names[][ETH_GSTRING_LEN] = {
+	__DEFINE_LINK_MODE_NAME(10, T, Half),
+	__DEFINE_LINK_MODE_NAME(10, T, Full),
+	__DEFINE_LINK_MODE_NAME(100, T, Half),
+	__DEFINE_LINK_MODE_NAME(100, T, Full),
+	__DEFINE_LINK_MODE_NAME(1000, T, Half),
+	__DEFINE_LINK_MODE_NAME(1000, T, Full),
+	__DEFINE_SPECIAL_MODE_NAME(Autoneg, "Autoneg"),
+	__DEFINE_SPECIAL_MODE_NAME(TP, "TP"),
+	__DEFINE_SPECIAL_MODE_NAME(AUI, "AUI"),
+	__DEFINE_SPECIAL_MODE_NAME(MII, "MII"),
+	__DEFINE_SPECIAL_MODE_NAME(FIBRE, "FIBRE"),
+	__DEFINE_SPECIAL_MODE_NAME(BNC, "BNC"),
+	__DEFINE_LINK_MODE_NAME(10000, T, Full),
+	__DEFINE_SPECIAL_MODE_NAME(Pause, "Pause"),
+	__DEFINE_SPECIAL_MODE_NAME(Asym_Pause, "Asym_Pause"),
+	__DEFINE_LINK_MODE_NAME(2500, X, Full),
+	__DEFINE_SPECIAL_MODE_NAME(Backplane, "Backplane"),
+	__DEFINE_LINK_MODE_NAME(1000, KX, Full),
+	__DEFINE_LINK_MODE_NAME(10000, KX4, Full),
+	__DEFINE_LINK_MODE_NAME(10000, KR, Full),
+	__DEFINE_SPECIAL_MODE_NAME(10000baseR_FEC, "10000baseR_FEC"),
+	__DEFINE_LINK_MODE_NAME(20000, MLD2, Full),
+	__DEFINE_LINK_MODE_NAME(20000, KR2, Full),
+	__DEFINE_LINK_MODE_NAME(40000, KR4, Full),
+	__DEFINE_LINK_MODE_NAME(40000, CR4, Full),
+	__DEFINE_LINK_MODE_NAME(40000, SR4, Full),
+	__DEFINE_LINK_MODE_NAME(40000, LR4, Full),
+	__DEFINE_LINK_MODE_NAME(56000, KR4, Full),
+	__DEFINE_LINK_MODE_NAME(56000, CR4, Full),
+	__DEFINE_LINK_MODE_NAME(56000, SR4, Full),
+	__DEFINE_LINK_MODE_NAME(56000, LR4, Full),
+	__DEFINE_LINK_MODE_NAME(25000, CR, Full),
+	__DEFINE_LINK_MODE_NAME(25000, KR, Full),
+	__DEFINE_LINK_MODE_NAME(25000, SR, Full),
+	__DEFINE_LINK_MODE_NAME(50000, CR2, Full),
+	__DEFINE_LINK_MODE_NAME(50000, KR2, Full),
+	__DEFINE_LINK_MODE_NAME(100000, KR4, Full),
+	__DEFINE_LINK_MODE_NAME(100000, SR4, Full),
+	__DEFINE_LINK_MODE_NAME(100000, CR4, Full),
+	__DEFINE_LINK_MODE_NAME(100000, LR4_ER4, Full),
+	__DEFINE_LINK_MODE_NAME(50000, SR2, Full),
+	__DEFINE_LINK_MODE_NAME(1000, X, Full),
+	__DEFINE_LINK_MODE_NAME(10000, CR, Full),
+	__DEFINE_LINK_MODE_NAME(10000, SR, Full),
+	__DEFINE_LINK_MODE_NAME(10000, LR, Full),
+	__DEFINE_LINK_MODE_NAME(10000, LRM, Full),
+	__DEFINE_LINK_MODE_NAME(10000, ER, Full),
+	__DEFINE_LINK_MODE_NAME(2500, T, Full),
+	__DEFINE_LINK_MODE_NAME(5000, T, Full),
+	__DEFINE_SPECIAL_MODE_NAME(FEC_NONE, "None"),
+	__DEFINE_SPECIAL_MODE_NAME(FEC_RS, "RS"),
+	__DEFINE_SPECIAL_MODE_NAME(FEC_BASER, "BASER"),
+	__DEFINE_LINK_MODE_NAME(50000, KR, Full),
+	__DEFINE_LINK_MODE_NAME(50000, SR, Full),
+	__DEFINE_LINK_MODE_NAME(50000, CR, Full),
+	__DEFINE_LINK_MODE_NAME(50000, LR_ER_FR, Full),
+	__DEFINE_LINK_MODE_NAME(50000, DR, Full),
+	__DEFINE_LINK_MODE_NAME(100000, KR2, Full),
+	__DEFINE_LINK_MODE_NAME(100000, SR2, Full),
+	__DEFINE_LINK_MODE_NAME(100000, CR2, Full),
+	__DEFINE_LINK_MODE_NAME(100000, LR2_ER2_FR2, Full),
+	__DEFINE_LINK_MODE_NAME(100000, DR2, Full),
+	__DEFINE_LINK_MODE_NAME(200000, KR4, Full),
+	__DEFINE_LINK_MODE_NAME(200000, SR4, Full),
+	__DEFINE_LINK_MODE_NAME(200000, LR4_ER4_FR4, Full),
+	__DEFINE_LINK_MODE_NAME(200000, DR4, Full),
+	__DEFINE_LINK_MODE_NAME(200000, CR4, Full),
+	__DEFINE_LINK_MODE_NAME(100, T1, Full),
+	__DEFINE_LINK_MODE_NAME(1000, T1, Full),
+	__DEFINE_LINK_MODE_NAME(400000, KR8, Full),
+	__DEFINE_LINK_MODE_NAME(400000, SR8, Full),
+	__DEFINE_LINK_MODE_NAME(400000, LR8_ER8_FR8, Full),
+	__DEFINE_LINK_MODE_NAME(400000, DR8, Full),
+	__DEFINE_LINK_MODE_NAME(400000, CR8, Full),
+};
+static_assert(ARRAY_SIZE(link_mode_names) == __ETHTOOL_LINK_MODE_MASK_NBITS);
diff --git a/net/ethtool/common.h b/net/ethtool/common.h
index 336566430be4..bbb788908cb1 100644
--- a/net/ethtool/common.h
+++ b/net/ethtool/common.h
@@ -5,6 +5,10 @@
 
 #include <linux/ethtool.h>
 
+/* compose link mode index from speed, type and duplex */
+#define ETHTOOL_LINK_MODE(speed, type, duplex) \
+	ETHTOOL_LINK_MODE_ ## speed ## base ## type ## _ ## duplex ## _BIT
+
 extern const char
 netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN];
 extern const char
@@ -13,5 +17,6 @@ extern const char
 tunable_strings[__ETHTOOL_TUNABLE_COUNT][ETH_GSTRING_LEN];
 extern const char
 phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN];
+extern const char link_mode_names[][ETH_GSTRING_LEN];
 
 #endif /* _ETHTOOL_COMMON_H */
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index b262db5a1d91..aed2c2cf1623 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -154,6 +154,9 @@ static int __ethtool_get_sset_count(struct net_device *dev, int sset)
 	    !ops->get_ethtool_phy_stats)
 		return phy_ethtool_get_sset_count(dev->phydev);
 
+	if (sset == ETH_SS_LINK_MODES)
+		return __ETHTOOL_LINK_MODE_MASK_NBITS;
+
 	if (ops->get_sset_count && ops->get_strings)
 		return ops->get_sset_count(dev, sset);
 	else
@@ -178,6 +181,9 @@ static void __ethtool_get_strings(struct net_device *dev,
 	else if (stringset == ETH_SS_PHY_STATS && dev->phydev &&
 		 !ops->get_ethtool_phy_stats)
 		phy_ethtool_get_strings(dev->phydev, data);
+	else if (stringset == ETH_SS_LINK_MODES)
+		memcpy(data, link_mode_names,
+		       __ETHTOOL_LINK_MODE_MASK_NBITS * ETH_GSTRING_LEN);
 	else
 		/* ops->get_strings is valid because checked earlier */
 		ops->get_strings(dev, stringset, data);
-- 
2.24.0

Re: [PATCH net-next v3 0/5] ethtool netlink interface, preliminary part

[Jakub Kicinski]

On Wed, 11 Dec 2019 10:58:09 +0100 (CET), Michal Kubecek wrote:
> As Jakub Kicinski suggested in ethtool netlink v7 discussion, this
> submission consists only of preliminary patches which raised no objections;
> first four patches already have Acked-by or Reviewed-by.
> 
> - patch 1 exposes permanent hardware address (as shown by "ethtool -P")
>   via rtnetlink
> - patch 2 is renames existing netlink helper to a better name
> - patch 3 and 4 reorganize existing ethtool code (no functional change)
> - patch 5 makes the table of link mode names available as an ethtool string
>   set (will be needed for the netlink interface) 

Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>

Re: [PATCH net-next v3 4/5] ethtool: move string arrays into common file

[Florian Fainelli]

On 12/11/2019 1:58 AM, Michal Kubecek wrote:
> Introduce file net/ethtool/common.c for code shared by ioctl and netlink
> ethtool interface. Move name tables of features, RSS hash functions,
> tunables and PHY tunables into this file.
> 
> Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
> Reviewed-by: Jiri Pirko <jiri@mellanox.com>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

Re: [PATCH net-next v3 5/5] ethtool: provide link mode names as a string set

[Florian Fainelli]

On 12/11/2019 1:58 AM, Michal Kubecek wrote:
> Unlike e.g. netdev features, the ethtool ioctl interface requires link mode
> table to be in sync between kernel and userspace for userspace to be able
> to display and set all link modes supported by kernel. The way arbitrary
> length bitsets are implemented in netlink interface, this will be no longer
> needed.
> 
> To allow userspace to access all link modes running kernel supports, add
> table of ethernet link mode names and make it available as a string set to
> userspace GET_STRSET requests. Add build time check to make sure names
> are defined for all modes declared in enum ethtool_link_mode_bit_indices.
> 
> Once the string set is available, make it also accessible via ioctl.
> 
> Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
> Reviewed-by: Andrew Lunn <andrew@lunn.ch>
> Reviewed-by: Jiri Pirko <jiri@mellanox.com>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

I would have almost treated the _Half_ modes a special to omit
specifying Full for 90% of the remaining modes and save both characters
and room for errors, but that's fine this way too.
-- 
Florian

Re: [PATCH net-next v3 0/5] ethtool netlink interface, preliminary part

[Florian Fainelli]

On 12/11/2019 1:58 AM, Michal Kubecek wrote:
> As Jakub Kicinski suggested in ethtool netlink v7 discussion, this
> submission consists only of preliminary patches which raised no objections;
> first four patches already have Acked-by or Reviewed-by.

Good strategy, let's make sure we can land the entire ethtool over
netlink for v5.6, that would be a great milestone and would open up the
door for quite a lot of development. Thanks for your persistence on the
subject, because this is anything but fun.
-- 
Florian

Re: [PATCH net-next v3 0/5] ethtool netlink interface, preliminary part

[David Miller]

From: Michal Kubecek <mkubecek@suse.cz>
Date: Wed, 11 Dec 2019 10:58:09 +0100 (CET)

> As Jakub Kicinski suggested in ethtool netlink v7 discussion, this
> submission consists only of preliminary patches which raised no objections;
> first four patches already have Acked-by or Reviewed-by.
> 
> - patch 1 exposes permanent hardware address (as shown by "ethtool -P")
>   via rtnetlink
> - patch 2 is renames existing netlink helper to a better name
> - patch 3 and 4 reorganize existing ethtool code (no functional change)
> - patch 5 makes the table of link mode names available as an ethtool string
>   set (will be needed for the netlink interface) 
> 
> Once we get these out of the way, v8 of the first part of the ethtool
> netlink interface will follow.
> 
> Changes from v2 to v3: fix SPDX licence identifiers (patch 3 and 5).
> 
> Changes from v1 to v2: restore build time check that all link modes have
> assigned a name (patch 5).

Series applied to net-next, thanks.