Adding upstream version 252.22.upstream/252.22

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1517 insertions, 0 deletions

diff --git a/src/shared/ethtool-util.c b/src/shared/ethtool-util.c
new file mode 100644
index 0000000..e39b2f7
--- /dev/null
+++ b/src/shared/ethtool-util.c
@@ -0,0 +1,1517 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <linux/ethtool.h>
+#include <linux/netdevice.h>
+#include <linux/sockios.h>
+
+#include "conf-parser.h"
+#include "ethtool-util.h"
+#include "extract-word.h"
+#include "fd-util.h"
+#include "log.h"
+#include "memory-util.h"
+#include "socket-util.h"
+#include "string-table.h"
+#include "strv.h"
+#include "strxcpyx.h"
+
+static const char* const duplex_table[_DUP_MAX] = {
+        [DUP_FULL] = "full",
+        [DUP_HALF] = "half"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(duplex, Duplex);
+DEFINE_CONFIG_PARSE_ENUM(config_parse_duplex, duplex, Duplex, "Failed to parse duplex setting");
+
+static const struct {
+        uint32_t opt;
+        const char *name;
+} wol_option_map[] = {
+        { WAKE_PHY,         "phy"        },
+        { WAKE_UCAST,       "unicast",   },
+        { WAKE_MCAST,       "multicast", },
+        { WAKE_BCAST,       "broadcast", },
+        { WAKE_ARP,         "arp",       },
+        { WAKE_MAGIC,       "magic",     },
+        { WAKE_MAGICSECURE, "secureon",  },
+};
+
+int wol_options_to_string_alloc(uint32_t opts, char **ret) {
+        _cleanup_free_ char *str = NULL;
+
+        assert(ret);
+
+        if (opts == UINT32_MAX) {
+                *ret = NULL;
+                return 0;
+        }
+
+        for (size_t i = 0; i < ELEMENTSOF(wol_option_map); i++)
+                if (opts & wol_option_map[i].opt &&
+                    !strextend_with_separator(&str, ",", wol_option_map[i].name))
+                        return -ENOMEM;
+
+        if (!str) {
+                str = strdup("off");
+                if (!str)
+                        return -ENOMEM;
+        }
+
+        *ret = TAKE_PTR(str);
+        return 1;
+}
+
+static const char* const port_table[] = {
+        [NET_DEV_PORT_TP]     = "tp",
+        [NET_DEV_PORT_AUI]    = "aui",
+        [NET_DEV_PORT_MII]    = "mii",
+        [NET_DEV_PORT_FIBRE]  = "fibre",
+        [NET_DEV_PORT_BNC]    = "bnc",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(port, NetDevPort);
+DEFINE_CONFIG_PARSE_ENUM(config_parse_port, port, NetDevPort, "Failed to parse Port setting");
+
+static const char* const mdi_table[] = {
+        [ETH_TP_MDI_INVALID]  = "unknown",
+        [ETH_TP_MDI]          = "mdi",
+        [ETH_TP_MDI_X]        = "mdi-x",
+        [ETH_TP_MDI_AUTO]     = "auto",
+};
+
+DEFINE_STRING_TABLE_LOOKUP_TO_STRING(mdi, int);
+
+static const char* const netdev_feature_table[_NET_DEV_FEAT_MAX] = {
+        [NET_DEV_FEAT_SG]                  = "tx-scatter-gather",
+        [NET_DEV_FEAT_IP_CSUM]             = "tx-checksum-ipv4",
+        [NET_DEV_FEAT_HW_CSUM]             = "tx-checksum-ip-generic",
+        [NET_DEV_FEAT_IPV6_CSUM]           = "tx-checksum-ipv6",
+        [NET_DEV_FEAT_HIGHDMA]             = "highdma",
+        [NET_DEV_FEAT_FRAGLIST]            = "tx-scatter-gather-fraglist",
+        [NET_DEV_FEAT_HW_VLAN_CTAG_TX]     = "tx-vlan-hw-insert",
+        [NET_DEV_FEAT_HW_VLAN_CTAG_RX]     = "rx-vlan-hw-parse",
+        [NET_DEV_FEAT_HW_VLAN_CTAG_FILTER] = "rx-vlan-filter",
+        [NET_DEV_FEAT_HW_VLAN_STAG_TX]     = "tx-vlan-stag-hw-insert",
+        [NET_DEV_FEAT_HW_VLAN_STAG_RX]     = "rx-vlan-stag-hw-parse",
+        [NET_DEV_FEAT_HW_VLAN_STAG_FILTER] = "rx-vlan-stag-filter",
+        [NET_DEV_FEAT_VLAN_CHALLENGED]     = "vlan-challenged",
+        [NET_DEV_FEAT_GSO]                 = "tx-generic-segmentation",
+        [NET_DEV_FEAT_LLTX]                = "tx-lockless",
+        [NET_DEV_FEAT_NETNS_LOCAL]         = "netns-local",
+        [NET_DEV_FEAT_GRO]                 = "rx-gro",
+        [NET_DEV_FEAT_GRO_HW]              = "rx-gro-hw",
+        [NET_DEV_FEAT_LRO]                 = "rx-lro",
+        [NET_DEV_FEAT_TSO]                 = "tx-tcp-segmentation",
+        [NET_DEV_FEAT_GSO_ROBUST]          = "tx-gso-robust",
+        [NET_DEV_FEAT_TSO_ECN]             = "tx-tcp-ecn-segmentation",
+        [NET_DEV_FEAT_TSO_MANGLEID]        = "tx-tcp-mangleid-segmentation",
+        [NET_DEV_FEAT_TSO6]                = "tx-tcp6-segmentation",
+        [NET_DEV_FEAT_FSO]                 = "tx-fcoe-segmentation",
+        [NET_DEV_FEAT_GSO_GRE]             = "tx-gre-segmentation",
+        [NET_DEV_FEAT_GSO_GRE_CSUM]        = "tx-gre-csum-segmentation",
+        [NET_DEV_FEAT_GSO_IPXIP4]          = "tx-ipxip4-segmentation",
+        [NET_DEV_FEAT_GSO_IPXIP6]          = "tx-ipxip6-segmentation",
+        [NET_DEV_FEAT_GSO_UDP_TUNNEL]      = "tx-udp_tnl-segmentation",
+        [NET_DEV_FEAT_GSO_UDP_TUNNEL_CSUM] = "tx-udp_tnl-csum-segmentation",
+        [NET_DEV_FEAT_GSO_PARTIAL]         = "tx-gso-partial",
+        [NET_DEV_FEAT_GSO_TUNNEL_REMCSUM]  = "tx-tunnel-remcsum-segmentation",
+        [NET_DEV_FEAT_GSO_SCTP]            = "tx-sctp-segmentation",
+        [NET_DEV_FEAT_GSO_ESP]             = "tx-esp-segmentation",
+        [NET_DEV_FEAT_GSO_UDP_L4]          = "tx-udp-segmentation",
+        [NET_DEV_FEAT_GSO_FRAGLIST]        = "tx-gso-list",
+        [NET_DEV_FEAT_FCOE_CRC]            = "tx-checksum-fcoe-crc",
+        [NET_DEV_FEAT_SCTP_CRC]            = "tx-checksum-sctp",
+        [NET_DEV_FEAT_FCOE_MTU]            = "fcoe-mtu",
+        [NET_DEV_FEAT_NTUPLE]              = "rx-ntuple-filter",
+        [NET_DEV_FEAT_RXHASH]              = "rx-hashing",
+        [NET_DEV_FEAT_RXCSUM]              = "rx-checksum",
+        [NET_DEV_FEAT_NOCACHE_COPY]        = "tx-nocache-copy",
+        [NET_DEV_FEAT_LOOPBACK]            = "loopback",
+        [NET_DEV_FEAT_RXFCS]               = "rx-fcs",
+        [NET_DEV_FEAT_RXALL]               = "rx-all",
+        [NET_DEV_FEAT_HW_L2FW_DOFFLOAD]    = "l2-fwd-offload",
+        [NET_DEV_FEAT_HW_TC]               = "hw-tc-offload",
+        [NET_DEV_FEAT_HW_ESP]              = "esp-hw-offload",
+        [NET_DEV_FEAT_HW_ESP_TX_CSUM]      = "esp-tx-csum-hw-offload",
+        [NET_DEV_FEAT_RX_UDP_TUNNEL_PORT]  = "rx-udp_tunnel-port-offload",
+        [NET_DEV_FEAT_HW_TLS_RECORD]       = "tls-hw-record",
+        [NET_DEV_FEAT_HW_TLS_TX]           = "tls-hw-tx-offload",
+        [NET_DEV_FEAT_HW_TLS_RX]           = "tls-hw-rx-offload",
+        [NET_DEV_FEAT_GRO_FRAGLIST]        = "rx-gro-list",
+        [NET_DEV_FEAT_HW_MACSEC]           = "macsec-hw-offload",
+        [NET_DEV_FEAT_GRO_UDP_FWD]         = "rx-udp-gro-forwarding",
+        [NET_DEV_FEAT_HW_HSR_TAG_INS]      = "hsr-tag-ins-offload",
+        [NET_DEV_FEAT_HW_HSR_TAG_RM]       = "hsr-tag-rm-offload",
+        [NET_DEV_FEAT_HW_HSR_FWD]          = "hsr-fwd-offload",
+        [NET_DEV_FEAT_HW_HSR_DUP]          = "hsr-dup-offload",
+
+        [NET_DEV_FEAT_TXCSUM]              = "tx-checksum-", /* The suffix "-" means any feature beginning with "tx-checksum-" */
+};
+
+static const char* const ethtool_link_mode_bit_table[] = {
+        [ETHTOOL_LINK_MODE_10baseT_Half_BIT]               = "10baset-half",
+        [ETHTOOL_LINK_MODE_10baseT_Full_BIT]               = "10baset-full",
+        [ETHTOOL_LINK_MODE_100baseT_Half_BIT]              = "100baset-half",
+        [ETHTOOL_LINK_MODE_100baseT_Full_BIT]              = "100baset-full",
+        [ETHTOOL_LINK_MODE_1000baseT_Half_BIT]             = "1000baset-half",
+        [ETHTOOL_LINK_MODE_1000baseT_Full_BIT]             = "1000baset-full",
+        [ETHTOOL_LINK_MODE_Autoneg_BIT]                    = "autonegotiation",
+        [ETHTOOL_LINK_MODE_TP_BIT]                         = "tp",
+        [ETHTOOL_LINK_MODE_AUI_BIT]                        = "aui",
+        [ETHTOOL_LINK_MODE_MII_BIT]                        = "mii",
+        [ETHTOOL_LINK_MODE_FIBRE_BIT]                      = "fibre",
+        [ETHTOOL_LINK_MODE_BNC_BIT]                        = "bnc",
+        [ETHTOOL_LINK_MODE_10000baseT_Full_BIT]            = "10000baset-full",
+        [ETHTOOL_LINK_MODE_Pause_BIT]                      = "pause",
+        [ETHTOOL_LINK_MODE_Asym_Pause_BIT]                 = "asym-pause",
+        [ETHTOOL_LINK_MODE_2500baseX_Full_BIT]             = "2500basex-full",
+        [ETHTOOL_LINK_MODE_Backplane_BIT]                  = "backplane",
+        [ETHTOOL_LINK_MODE_1000baseKX_Full_BIT]            = "1000basekx-full",
+        [ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT]          = "10000basekx4-full",
+        [ETHTOOL_LINK_MODE_10000baseKR_Full_BIT]           = "10000basekr-full",
+        [ETHTOOL_LINK_MODE_10000baseR_FEC_BIT]             = "10000baser-fec",
+        [ETHTOOL_LINK_MODE_20000baseMLD2_Full_BIT]         = "20000basemld2-full",
+        [ETHTOOL_LINK_MODE_20000baseKR2_Full_BIT]          = "20000basekr2-full",
+        [ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT]          = "40000basekr4-full",
+        [ETHTOOL_LINK_MODE_40000baseCR4_Full_BIT]          = "40000basecr4-full",
+        [ETHTOOL_LINK_MODE_40000baseSR4_Full_BIT]          = "40000basesr4-full",
+        [ETHTOOL_LINK_MODE_40000baseLR4_Full_BIT]          = "40000baselr4-full",
+        [ETHTOOL_LINK_MODE_56000baseKR4_Full_BIT]          = "56000basekr4-full",
+        [ETHTOOL_LINK_MODE_56000baseCR4_Full_BIT]          = "56000basecr4-full",
+        [ETHTOOL_LINK_MODE_56000baseSR4_Full_BIT]          = "56000basesr4-full",
+        [ETHTOOL_LINK_MODE_56000baseLR4_Full_BIT]          = "56000baselr4-full",
+        [ETHTOOL_LINK_MODE_25000baseCR_Full_BIT]           = "25000basecr-full",
+        [ETHTOOL_LINK_MODE_25000baseKR_Full_BIT]           = "25000basekr-full",
+        [ETHTOOL_LINK_MODE_25000baseSR_Full_BIT]           = "25000basesr-full",
+        [ETHTOOL_LINK_MODE_50000baseCR2_Full_BIT]          = "50000basecr2-full",
+        [ETHTOOL_LINK_MODE_50000baseKR2_Full_BIT]          = "50000basekr2-full",
+        [ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT]         = "100000basekr4-full",
+        [ETHTOOL_LINK_MODE_100000baseSR4_Full_BIT]         = "100000basesr4-full",
+        [ETHTOOL_LINK_MODE_100000baseCR4_Full_BIT]         = "100000basecr4-full",
+        [ETHTOOL_LINK_MODE_100000baseLR4_ER4_Full_BIT]     = "100000baselr4-er4-full",
+        [ETHTOOL_LINK_MODE_50000baseSR2_Full_BIT]          = "50000basesr2-full",
+        [ETHTOOL_LINK_MODE_1000baseX_Full_BIT]             = "1000basex-full",
+        [ETHTOOL_LINK_MODE_10000baseCR_Full_BIT]           = "10000basecr-full",
+        [ETHTOOL_LINK_MODE_10000baseSR_Full_BIT]           = "10000basesr-full",
+        [ETHTOOL_LINK_MODE_10000baseLR_Full_BIT]           = "10000baselr-full",
+        [ETHTOOL_LINK_MODE_10000baseLRM_Full_BIT]          = "10000baselrm-full",
+        [ETHTOOL_LINK_MODE_10000baseER_Full_BIT]           = "10000baseer-full",
+        [ETHTOOL_LINK_MODE_2500baseT_Full_BIT]             = "2500baset-full",
+        [ETHTOOL_LINK_MODE_5000baseT_Full_BIT]             = "5000baset-full",
+        [ETHTOOL_LINK_MODE_FEC_NONE_BIT]                   = "fec-none",
+        [ETHTOOL_LINK_MODE_FEC_RS_BIT]                     = "fec-rs",
+        [ETHTOOL_LINK_MODE_FEC_BASER_BIT]                  = "fec-baser",
+        [ETHTOOL_LINK_MODE_50000baseKR_Full_BIT]           = "50000basekr-full",
+        [ETHTOOL_LINK_MODE_50000baseSR_Full_BIT]           = "50000basesr-full",
+        [ETHTOOL_LINK_MODE_50000baseCR_Full_BIT]           = "50000basecr-full",
+        [ETHTOOL_LINK_MODE_50000baseLR_ER_FR_Full_BIT]     = "50000baselr-er-fr-full",
+        [ETHTOOL_LINK_MODE_50000baseDR_Full_BIT]           = "50000basedr-full",
+        [ETHTOOL_LINK_MODE_100000baseKR2_Full_BIT]         = "100000basekr2-full",
+        [ETHTOOL_LINK_MODE_100000baseSR2_Full_BIT]         = "100000basesr2-full",
+        [ETHTOOL_LINK_MODE_100000baseCR2_Full_BIT]         = "100000basecr2-full",
+        [ETHTOOL_LINK_MODE_100000baseLR2_ER2_FR2_Full_BIT] = "100000baselr2-er2-fr2-full",
+        [ETHTOOL_LINK_MODE_100000baseDR2_Full_BIT]         = "100000basedr2-full",
+        [ETHTOOL_LINK_MODE_200000baseKR4_Full_BIT]         = "200000basekr4-full",
+        [ETHTOOL_LINK_MODE_200000baseSR4_Full_BIT]         = "200000basesr4-full",
+        [ETHTOOL_LINK_MODE_200000baseLR4_ER4_FR4_Full_BIT] = "200000baselr4-er4-fr4-full",
+        [ETHTOOL_LINK_MODE_200000baseDR4_Full_BIT]         = "200000basedr4-full",
+        [ETHTOOL_LINK_MODE_200000baseCR4_Full_BIT]         = "200000basecr4-full",
+        [ETHTOOL_LINK_MODE_100baseT1_Full_BIT]             = "100baset1-full",
+        [ETHTOOL_LINK_MODE_1000baseT1_Full_BIT]            = "1000baset1-full",
+        [ETHTOOL_LINK_MODE_400000baseKR8_Full_BIT]         = "400000basekr8-full",
+        [ETHTOOL_LINK_MODE_400000baseSR8_Full_BIT]         = "400000basesr8-full",
+        [ETHTOOL_LINK_MODE_400000baseLR8_ER8_FR8_Full_BIT] = "400000baselr8-er8-fr8-full",
+        [ETHTOOL_LINK_MODE_400000baseDR8_Full_BIT]         = "400000basedr8-full",
+        [ETHTOOL_LINK_MODE_400000baseCR8_Full_BIT]         = "400000basecr8-full",
+        [ETHTOOL_LINK_MODE_FEC_LLRS_BIT]                   = "fec-llrs",
+        [ETHTOOL_LINK_MODE_100000baseKR_Full_BIT]          = "100000basekr-full",
+        [ETHTOOL_LINK_MODE_100000baseSR_Full_BIT]          = "100000basesr-full",
+        [ETHTOOL_LINK_MODE_100000baseLR_ER_FR_Full_BIT]    = "100000baselr-er-fr-full",
+        [ETHTOOL_LINK_MODE_100000baseCR_Full_BIT]          = "100000basecr-full",
+        [ETHTOOL_LINK_MODE_100000baseDR_Full_BIT]          = "100000basedr-full",
+        [ETHTOOL_LINK_MODE_200000baseKR2_Full_BIT]         = "200000basekr2-full",
+        [ETHTOOL_LINK_MODE_200000baseSR2_Full_BIT]         = "200000basesr2-full",
+        [ETHTOOL_LINK_MODE_200000baseLR2_ER2_FR2_Full_BIT] = "200000baselr2-er2-fr2-full",
+        [ETHTOOL_LINK_MODE_200000baseDR2_Full_BIT]         = "200000basedr2-full",
+        [ETHTOOL_LINK_MODE_200000baseCR2_Full_BIT]         = "200000basecr2-full",
+        [ETHTOOL_LINK_MODE_400000baseKR4_Full_BIT]         = "400000basekr4-full",
+        [ETHTOOL_LINK_MODE_400000baseSR4_Full_BIT]         = "400000basesr4-full",
+        [ETHTOOL_LINK_MODE_400000baseLR4_ER4_FR4_Full_BIT] = "400000baselr4-er4-fr4-full",
+        [ETHTOOL_LINK_MODE_400000baseDR4_Full_BIT]         = "400000basedr4-full",
+        [ETHTOOL_LINK_MODE_400000baseCR4_Full_BIT]         = "400000basecr4-full",
+        [ETHTOOL_LINK_MODE_100baseFX_Half_BIT]             = "100basefx-half",
+        [ETHTOOL_LINK_MODE_100baseFX_Full_BIT]             = "100basefx-full",
+};
+/* Make sure the array is large enough to fit all bits */
+assert_cc((ELEMENTSOF(ethtool_link_mode_bit_table)-1) / 32 < N_ADVERTISE);
+
+DEFINE_STRING_TABLE_LOOKUP(ethtool_link_mode_bit, enum ethtool_link_mode_bit_indices);
+
+static int ethtool_connect(int *ethtool_fd) {
+        int fd;
+
+        assert(ethtool_fd);
+
+        /* This does nothing if already connected. */
+        if (*ethtool_fd >= 0)
+                return 0;
+
+        fd = socket_ioctl_fd();
+        if (fd < 0)
+                return log_debug_errno(fd, "ethtool: could not create control socket: %m");
+
+        *ethtool_fd = fd;
+        return 0;
+}
+
+int ethtool_get_driver(int *ethtool_fd, const char *ifname, char **ret) {
+        struct ethtool_drvinfo ecmd = {
+                .cmd = ETHTOOL_GDRVINFO,
+        };
+        struct ifreq ifr = {
+                .ifr_data = (void*) &ecmd,
+        };
+        char *d;
+        int r;
+
+        assert(ethtool_fd);
+        assert(ifname);
+        assert(ret);
+
+        r = ethtool_connect(ethtool_fd);
+        if (r < 0)
+                return r;
+
+        strscpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+
+        if (ioctl(*ethtool_fd, SIOCETHTOOL, &ifr) < 0)
+                return -errno;
+
+        if (isempty(ecmd.driver))
+                return -ENODATA;
+
+        d = strdup(ecmd.driver);
+        if (!d)
+                return -ENOMEM;
+
+        *ret = d;
+        return 0;
+}
+
+int ethtool_get_link_info(
+                int *ethtool_fd,
+                const char *ifname,
+                int *ret_autonegotiation,
+                uint64_t *ret_speed,
+                Duplex *ret_duplex,
+                NetDevPort *ret_port) {
+
+        struct ethtool_cmd ecmd = {
+                .cmd = ETHTOOL_GSET,
+        };
+        struct ifreq ifr = {
+                .ifr_data = (void*) &ecmd,
+        };
+        int r;
+
+        assert(ethtool_fd);
+        assert(ifname);
+
+        r = ethtool_connect(ethtool_fd);
+        if (r < 0)
+                return r;
+
+        strscpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+
+        if (ioctl(*ethtool_fd, SIOCETHTOOL, &ifr) < 0)
+                return -errno;
+
+        if (ret_autonegotiation)
+                *ret_autonegotiation = ecmd.autoneg;
+
+        if (ret_speed) {
+                uint32_t speed;
+
+                speed = ethtool_cmd_speed(&ecmd);
+                *ret_speed = speed == (uint32_t) SPEED_UNKNOWN ?
+                        UINT64_MAX : (uint64_t) speed * 1000 * 1000;
+        }
+
+        if (ret_duplex)
+                *ret_duplex = ecmd.duplex;
+
+        if (ret_port)
+                *ret_port = ecmd.port;
+
+        return 0;
+}
+
+int ethtool_get_permanent_hw_addr(int *ethtool_fd, const char *ifname, struct hw_addr_data *ret) {
+        _cleanup_close_ int fd = -1;
+        struct {
+                struct ethtool_perm_addr addr;
+                uint8_t space[HW_ADDR_MAX_SIZE];
+        } epaddr = {
+                .addr.cmd = ETHTOOL_GPERMADDR,
+                .addr.size = HW_ADDR_MAX_SIZE,
+        };
+        struct ifreq ifr = {
+                .ifr_data = (caddr_t) &epaddr,
+        };
+        int r;
+
+        assert(ifname);
+        assert(ret);
+
+        if (!ethtool_fd)
+                ethtool_fd = &fd;
+        r = ethtool_connect(ethtool_fd);
+        if (r < 0)
+                return r;
+
+        strscpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+
+        if (ioctl(*ethtool_fd, SIOCETHTOOL, &ifr) < 0)
+                return -errno;
+
+        if (epaddr.addr.size == 0)
+                return -ENODATA;
+
+        if (epaddr.addr.size > HW_ADDR_MAX_SIZE)
+                return -EINVAL;
+
+        ret->length = epaddr.addr.size;
+        memcpy(ret->bytes, epaddr.addr.data, epaddr.addr.size);
+        return 0;
+}
+
+#define UPDATE(dest, val, updated)                     \
+        do {                                           \
+                typeof(val) _v = (val);                \
+                if (dest != _v)                        \
+                        updated = true;                \
+                dest = _v;                             \
+        } while (false)
+
+#define UPDATE_WITH_MAX(dest, max, val, updated)       \
+        do {                                           \
+                typeof(dest) _v = (val);               \
+                typeof(dest) _max = (max);             \
+                if (_v == 0 || _v > _max)              \
+                        _v = _max;                     \
+                if (dest != _v)                        \
+                        updated = true;                \
+                dest = _v;                             \
+        } while (false)
+
+int ethtool_set_wol(
+                int *ethtool_fd,
+                const char *ifname,
+                uint32_t wolopts,
+                const uint8_t password[SOPASS_MAX]) {
+
+        struct ethtool_wolinfo ecmd = {
+                .cmd = ETHTOOL_GWOL,
+        };
+        struct ifreq ifr = {
+                .ifr_data = (void*) &ecmd,
+        };
+        bool need_update = false;
+        int r;
+
+        assert(ethtool_fd);
+        assert(ifname);
+
+        if (wolopts == UINT32_MAX && !password)
+                /* Nothing requested. Return earlier. */
+                return 0;
+
+        r = ethtool_connect(ethtool_fd);
+        if (r < 0)
+                return r;
+
+        strscpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+
+        if (ioctl(*ethtool_fd, SIOCETHTOOL, &ifr) < 0)
+                return -errno;
+
+        if (wolopts == UINT32_MAX) {
+                /* When password is specified without valid WoL options specified, then enable
+                 * WAKE_MAGICSECURE flag if supported. */
+                wolopts = ecmd.wolopts;
+                if (password && FLAGS_SET(ecmd.supported, WAKE_MAGICSECURE))
+                        wolopts |= WAKE_MAGICSECURE;
+        }
+
+        if ((wolopts & ~ecmd.supported) != 0) {
+                _cleanup_free_ char *str = NULL;
+
+                (void) wol_options_to_string_alloc(wolopts & ~ecmd.supported, &str);
+                log_debug("Network interface %s does not support requested Wake on LAN options \"%s\", ignoring.",
+                          ifname, strna(str));
+
+                wolopts &= ecmd.supported;
+        }
+
+        if (!FLAGS_SET(wolopts, WAKE_MAGICSECURE))
+                /* When WAKE_MAGICSECURE flag is not set, then ignore password. */
+                password = NULL;
+
+        UPDATE(ecmd.wolopts, wolopts, need_update);
+        if (password &&
+            memcmp(ecmd.sopass, password, sizeof(ecmd.sopass)) != 0) {
+                memcpy(ecmd.sopass, password, sizeof(ecmd.sopass));
+                need_update = true;
+        }
+
+        if (!need_update) {
+                explicit_bzero_safe(&ecmd, sizeof(ecmd));
+                return 0;
+        }
+
+        ecmd.cmd = ETHTOOL_SWOL;
+        r = RET_NERRNO(ioctl(*ethtool_fd, SIOCETHTOOL, &ifr));
+
+        explicit_bzero_safe(&ecmd, sizeof(ecmd));
+        return r;
+}
+
+int ethtool_set_nic_buffer_size(int *ethtool_fd, const char *ifname, const netdev_ring_param *ring) {
+        struct ethtool_ringparam ecmd = {
+                .cmd = ETHTOOL_GRINGPARAM,
+        };
+        struct ifreq ifr = {
+                .ifr_data = (void*) &ecmd,
+        };
+        bool need_update = false;
+        int r;
+
+        assert(ethtool_fd);
+        assert(ifname);
+        assert(ring);
+
+        if (!ring->rx.set &&
+            !ring->rx_mini.set &&
+            !ring->rx_jumbo.set &&
+            !ring->tx.set)
+                return 0;
+
+        r = ethtool_connect(ethtool_fd);
+        if (r < 0)
+                return r;
+
+        strscpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+
+        if (ioctl(*ethtool_fd, SIOCETHTOOL, &ifr) < 0)
+                return -errno;
+
+        if (ring->rx.set)
+                UPDATE_WITH_MAX(ecmd.rx_pending, ecmd.rx_max_pending, ring->rx.value, need_update);
+
+        if (ring->rx_mini.set)
+                UPDATE_WITH_MAX(ecmd.rx_mini_pending, ecmd.rx_mini_max_pending, ring->rx_mini.value, need_update);
+
+        if (ring->rx_jumbo.set)
+                UPDATE_WITH_MAX(ecmd.rx_jumbo_pending, ecmd.rx_jumbo_max_pending, ring->rx_jumbo.value, need_update);
+
+        if (ring->tx.set)
+                UPDATE_WITH_MAX(ecmd.tx_pending, ecmd.tx_max_pending, ring->tx.value, need_update);
+
+        if (!need_update)
+                return 0;
+
+        ecmd.cmd = ETHTOOL_SRINGPARAM;
+        return RET_NERRNO(ioctl(*ethtool_fd, SIOCETHTOOL, &ifr));
+}
+
+static int get_stringset(int ethtool_fd, const char *ifname, enum ethtool_stringset stringset_id, struct ethtool_gstrings **ret) {
+        _cleanup_free_ struct ethtool_gstrings *strings = NULL;
+        struct {
+                struct ethtool_sset_info info;
+                uint32_t space;
+        } buffer = {
+                .info.cmd = ETHTOOL_GSSET_INFO,
+                .info.sset_mask = UINT64_C(1) << stringset_id,
+        };
+        struct ifreq ifr = {
+                .ifr_data = (void*) &buffer,
+        };
+        uint32_t len;
+
+        assert(ethtool_fd >= 0);
+        assert(ifname);
+        assert(ret);
+
+        strscpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+
+        if (ioctl(ethtool_fd, SIOCETHTOOL, &ifr) < 0)
+                return -errno;
+
+        if (buffer.info.sset_mask == 0)
+                return -EOPNOTSUPP;
+
+#pragma GCC diagnostic push
+#if HAVE_ZERO_LENGTH_BOUNDS
+#  pragma GCC diagnostic ignored "-Wzero-length-bounds"
+#endif
+        len = buffer.info.data[0];
+#pragma GCC diagnostic pop
+        if (len == 0)
+                return -EOPNOTSUPP;
+
+        strings = malloc0(offsetof(struct ethtool_gstrings, data) + len * ETH_GSTRING_LEN);
+        if (!strings)
+                return -ENOMEM;
+
+        strings->cmd = ETHTOOL_GSTRINGS;
+        strings->string_set = stringset_id;
+        strings->len = len;
+
+        ifr.ifr_data = (void*) strings;
+
+        if (ioctl(ethtool_fd, SIOCETHTOOL, &ifr) < 0)
+                return -errno;
+
+        *ret = TAKE_PTR(strings);
+        return 0;
+}
+
+static int get_features(int ethtool_fd, const char *ifname, uint32_t n_features, struct ethtool_gfeatures **ret) {
+        _cleanup_free_ struct ethtool_gfeatures *gfeatures = NULL;
+        struct ifreq ifr;
+
+        assert(ethtool_fd >= 0);
+        assert(ifname);
+        assert(ret);
+        assert(n_features > 0);
+
+        gfeatures = malloc0(offsetof(struct ethtool_gfeatures, features) +
+                            DIV_ROUND_UP(n_features, 32U) * sizeof(gfeatures->features[0]));
+        if (!gfeatures)
+                return -ENOMEM;
+
+        gfeatures->cmd = ETHTOOL_GFEATURES;
+        gfeatures->size = DIV_ROUND_UP(n_features, 32U);
+
+        ifr = (struct ifreq) {
+                .ifr_data = (void*) gfeatures,
+        };
+        strscpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+
+        if (ioctl(ethtool_fd, SIOCETHTOOL, &ifr) < 0)
+                return -errno;
+
+        *ret = TAKE_PTR(gfeatures);
+        return 0;
+}
+
+static int set_features_bit(
+                const struct ethtool_gstrings *strings,
+                const struct ethtool_gfeatures *gfeatures,
+                struct ethtool_sfeatures *sfeatures,
+                const char *feature,
+                int flag) {
+
+        assert(strings);
+        assert(gfeatures);
+        assert(sfeatures);
+        assert(feature);
+
+        if (flag < 0)
+                return 0;
+
+        for (uint32_t i = 0; i < strings->len; i++) {
+                uint32_t block, mask;
+
+                if (!strneq((const char*) &strings->data[i * ETH_GSTRING_LEN], feature, ETH_GSTRING_LEN))
+                        continue;
+
+                block = i / 32;
+                mask = UINT32_C(1) << (i % 32);
+
+                if (!FLAGS_SET(gfeatures->features[block].available, mask) ||
+                    FLAGS_SET(gfeatures->features[block].never_changed, mask))
+                        return -EOPNOTSUPP;
+
+                sfeatures->features[block].valid |= mask;
+                SET_FLAG(sfeatures->features[block].requested, mask, flag);
+
+                return 0;
+        }
+
+        return -ENODATA;
+}
+
+static int set_features_multiple_bit(
+                const struct ethtool_gstrings *strings,
+                const struct ethtool_gfeatures *gfeatures,
+                struct ethtool_sfeatures *sfeatures,
+                const char *feature,
+                int flag) {
+
+        bool found = false;
+        int r = -ENODATA;
+
+        assert(strings);
+        assert(gfeatures);
+        assert(sfeatures);
+        assert(feature);
+
+        if (flag < 0)
+                return 0;
+
+        for (uint32_t i = 0; i < strings->len; i++) {
+                uint32_t block, mask;
+
+                if (!startswith((const char*) &strings->data[i * ETH_GSTRING_LEN], feature))
+                        continue;
+
+                block = i / 32;
+                mask = UINT32_C(1) << (i % 32);
+
+                if (!FLAGS_SET(gfeatures->features[block].available, mask) ||
+                    FLAGS_SET(gfeatures->features[block].never_changed, mask)) {
+                        r = -EOPNOTSUPP;
+                        continue;
+                }
+
+                /* The flags is explicitly set by set_features_bit() */
+                if (FLAGS_SET(sfeatures->features[block].valid, mask))
+                        continue;
+
+                sfeatures->features[block].valid |= mask;
+                SET_FLAG(sfeatures->features[block].requested, mask, flag);
+
+                found = true;
+        }
+
+        return found ? 0 : r;
+}
+
+int ethtool_set_features(int *ethtool_fd, const char *ifname, const int features[static _NET_DEV_FEAT_MAX]) {
+        _cleanup_free_ struct ethtool_gstrings *strings = NULL;
+        _cleanup_free_ struct ethtool_gfeatures *gfeatures = NULL;
+        _cleanup_free_ struct ethtool_sfeatures *sfeatures = NULL;
+        struct ifreq ifr;
+        bool have = false;
+        int r;
+
+        assert(ethtool_fd);
+        assert(ifname);
+        assert(features);
+
+        for (size_t i = 0; i < _NET_DEV_FEAT_MAX; i++)
+                if (features[i] >= 0) {
+                        have = true;
+                        break;
+                }
+
+        if (!have)
+                return 0;
+
+        r = ethtool_connect(ethtool_fd);
+        if (r < 0)
+                return r;
+
+        r = get_stringset(*ethtool_fd, ifname, ETH_SS_FEATURES, &strings);
+        if (r < 0)
+                return log_debug_errno(r, "ethtool: could not get ethtool feature strings: %m");
+
+        r = get_features(*ethtool_fd, ifname, strings->len, &gfeatures);
+        if (r < 0)
+                return log_debug_errno(r, "ethtool: could not get ethtool features for %s: %m", ifname);
+
+        sfeatures = malloc0(offsetof(struct ethtool_sfeatures, features) +
+                            DIV_ROUND_UP(strings->len, 32U) * sizeof(sfeatures->features[0]));
+        if (!sfeatures)
+                return log_oom_debug();
+
+        sfeatures->cmd = ETHTOOL_SFEATURES;
+        sfeatures->size = DIV_ROUND_UP(strings->len, 32U);
+
+        for (size_t i = 0; i < _NET_DEV_FEAT_SIMPLE_MAX; i++) {
+                r = set_features_bit(strings, gfeatures, sfeatures, netdev_feature_table[i], features[i]);
+                if (r < 0)
+                        log_debug_errno(r, "ethtool: could not set feature %s for %s, ignoring: %m", netdev_feature_table[i], ifname);
+        }
+
+        for (size_t i = _NET_DEV_FEAT_SIMPLE_MAX; i < _NET_DEV_FEAT_MAX; i++) {
+                r = set_features_multiple_bit(strings, gfeatures, sfeatures, netdev_feature_table[i], features[i]);
+                if (r < 0)
+                        log_debug_errno(r, "ethtool: could not set feature %s for %s, ignoring: %m", netdev_feature_table[i], ifname);
+        }
+
+        ifr = (struct ifreq) {
+                .ifr_data = (void*) sfeatures,
+        };
+        strscpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+
+        if (ioctl(*ethtool_fd, SIOCETHTOOL, &ifr) < 0)
+                return log_debug_errno(errno, "ethtool: could not set ethtool features for %s", ifname);
+
+        return 0;
+}
+
+static int get_glinksettings(int fd, struct ifreq *ifr, struct ethtool_link_usettings **ret) {
+        struct ecmd {
+                struct ethtool_link_settings req;
+                uint32_t link_mode_data[3 * ETHTOOL_LINK_MODE_MASK_MAX_KERNEL_NU32];
+        } ecmd = {
+                .req.cmd = ETHTOOL_GLINKSETTINGS,
+        };
+        struct ethtool_link_usettings *u;
+        unsigned offset;
+
+        assert(fd >= 0);
+        assert(ifr);
+        assert(ret);
+
+        /* The interaction user/kernel via the new API requires a small ETHTOOL_GLINKSETTINGS
+           handshake first to agree on the length of the link mode bitmaps. If kernel doesn't
+           agree with user, it returns the bitmap length it is expecting from user as a negative
+           length (and cmd field is 0). When kernel and user agree, kernel returns valid info in
+           all fields (ie. link mode length > 0 and cmd is ETHTOOL_GLINKSETTINGS). Based on
+           https://github.com/torvalds/linux/commit/3f1ac7a700d039c61d8d8b99f28d605d489a60cf
+        */
+
+        ifr->ifr_data = (void *) &ecmd;
+
+        if (ioctl(fd, SIOCETHTOOL, ifr) < 0)
+                return -errno;
+
+        if (ecmd.req.link_mode_masks_nwords >= 0 || ecmd.req.cmd != ETHTOOL_GLINKSETTINGS)
+                return -EOPNOTSUPP;
+
+        ecmd.req.link_mode_masks_nwords = -ecmd.req.link_mode_masks_nwords;
+
+        ifr->ifr_data = (void *) &ecmd;
+
+        if (ioctl(fd, SIOCETHTOOL, ifr) < 0)
+                return -errno;
+
+        if (ecmd.req.link_mode_masks_nwords <= 0 || ecmd.req.cmd != ETHTOOL_GLINKSETTINGS)
+                return -EOPNOTSUPP;
+
+        u = new(struct ethtool_link_usettings, 1);
+        if (!u)
+                return -ENOMEM;
+
+        *u = (struct ethtool_link_usettings) {
+                .base = ecmd.req,
+        };
+
+        offset = 0;
+        memcpy(u->link_modes.supported, &ecmd.link_mode_data[offset], 4 * ecmd.req.link_mode_masks_nwords);
+
+        offset += ecmd.req.link_mode_masks_nwords;
+        memcpy(u->link_modes.advertising, &ecmd.link_mode_data[offset], 4 * ecmd.req.link_mode_masks_nwords);
+
+        offset += ecmd.req.link_mode_masks_nwords;
+        memcpy(u->link_modes.lp_advertising, &ecmd.link_mode_data[offset], 4 * ecmd.req.link_mode_masks_nwords);
+
+        *ret = u;
+
+        return 0;
+}
+
+static int get_gset(int fd, struct ifreq *ifr, struct ethtool_link_usettings **ret) {
+        struct ethtool_link_usettings *e;
+        struct ethtool_cmd ecmd = {
+                .cmd = ETHTOOL_GSET,
+        };
+
+        assert(fd >= 0);
+        assert(ifr);
+        assert(ret);
+
+        ifr->ifr_data = (void *) &ecmd;
+
+        if (ioctl(fd, SIOCETHTOOL, ifr) < 0)
+                return -errno;
+
+        e = new(struct ethtool_link_usettings, 1);
+        if (!e)
+                return -ENOMEM;
+
+        *e = (struct ethtool_link_usettings) {
+                .base.cmd = ETHTOOL_GSET,
+                .base.link_mode_masks_nwords = 1,
+                .base.speed = ethtool_cmd_speed(&ecmd),
+                .base.duplex = ecmd.duplex,
+                .base.port = ecmd.port,
+                .base.phy_address = ecmd.phy_address,
+                .base.autoneg = ecmd.autoneg,
+                .base.mdio_support = ecmd.mdio_support,
+                .base.eth_tp_mdix = ecmd.eth_tp_mdix,
+                .base.eth_tp_mdix_ctrl = ecmd.eth_tp_mdix_ctrl,
+
+                .link_modes.supported[0] = ecmd.supported,
+                .link_modes.advertising[0] = ecmd.advertising,
+                .link_modes.lp_advertising[0] = ecmd.lp_advertising,
+        };
+
+        *ret = e;
+
+        return 0;
+}
+
+static int set_slinksettings(int fd, struct ifreq *ifr, const struct ethtool_link_usettings *u) {
+        struct {
+                struct ethtool_link_settings req;
+                uint32_t link_mode_data[3 * ETHTOOL_LINK_MODE_MASK_MAX_KERNEL_NU32];
+        } ecmd = {};
+        unsigned offset;
+
+        assert(fd >= 0);
+        assert(ifr);
+        assert(u);
+
+        if (u->base.cmd != ETHTOOL_GLINKSETTINGS || u->base.link_mode_masks_nwords <= 0)
+                return -EINVAL;
+
+        ecmd.req = u->base;
+        ecmd.req.cmd = ETHTOOL_SLINKSETTINGS;
+        offset = 0;
+        memcpy(&ecmd.link_mode_data[offset], u->link_modes.supported, 4 * ecmd.req.link_mode_masks_nwords);
+
+        offset += ecmd.req.link_mode_masks_nwords;
+        memcpy(&ecmd.link_mode_data[offset], u->link_modes.advertising, 4 * ecmd.req.link_mode_masks_nwords);
+
+        offset += ecmd.req.link_mode_masks_nwords;
+        memcpy(&ecmd.link_mode_data[offset], u->link_modes.lp_advertising, 4 * ecmd.req.link_mode_masks_nwords);
+
+        ifr->ifr_data = (void *) &ecmd;
+
+        return RET_NERRNO(ioctl(fd, SIOCETHTOOL, ifr));
+}
+
+static int set_sset(int fd, struct ifreq *ifr, const struct ethtool_link_usettings *u) {
+        struct ethtool_cmd ecmd = {
+                .cmd = ETHTOOL_SSET,
+        };
+
+        assert(fd >= 0);
+        assert(ifr);
+        assert(u);
+
+        if (u->base.cmd != ETHTOOL_GSET || u->base.link_mode_masks_nwords <= 0)
+                return -EINVAL;
+
+        ecmd.supported = u->link_modes.supported[0];
+        ecmd.advertising = u->link_modes.advertising[0];
+        ecmd.lp_advertising = u->link_modes.lp_advertising[0];
+
+        ethtool_cmd_speed_set(&ecmd, u->base.speed);
+
+        ecmd.duplex = u->base.duplex;
+        ecmd.port = u->base.port;
+        ecmd.phy_address = u->base.phy_address;
+        ecmd.autoneg = u->base.autoneg;
+        ecmd.mdio_support = u->base.mdio_support;
+        ecmd.eth_tp_mdix = u->base.eth_tp_mdix;
+        ecmd.eth_tp_mdix_ctrl = u->base.eth_tp_mdix_ctrl;
+
+        ifr->ifr_data = (void *) &ecmd;
+
+        return RET_NERRNO(ioctl(fd, SIOCETHTOOL, ifr));
+}
+
+int ethtool_set_glinksettings(
+                int *fd,
+                const char *ifname,
+                int autonegotiation,
+                const uint32_t advertise[static N_ADVERTISE],
+                uint64_t speed,
+                Duplex duplex,
+                NetDevPort port,
+                uint8_t mdi) {
+
+        _cleanup_free_ struct ethtool_link_usettings *u = NULL;
+        struct ifreq ifr = {};
+        bool changed = false;
+        int r;
+
+        assert(fd);
+        assert(ifname);
+        assert(advertise);
+
+        if (autonegotiation < 0 && memeqzero(advertise, sizeof(uint32_t) * N_ADVERTISE) &&
+            speed == 0 && duplex < 0 && port < 0 && mdi == ETH_TP_MDI_INVALID)
+                return 0;
+
+        /* If autonegotiation is disabled, the speed and duplex represent the fixed link mode and are
+         * writable if the driver supports multiple link modes. If it is enabled then they are
+         * read-only. If the link is up they represent the negotiated link mode; if the link is down,
+         * the speed is 0, %SPEED_UNKNOWN or the highest enabled speed and @duplex is %DUPLEX_UNKNOWN
+         * or the best enabled duplex mode. */
+
+        if (speed > 0 || duplex >= 0 || port >= 0) {
+                if (autonegotiation == AUTONEG_ENABLE || !memeqzero(advertise, sizeof(uint32_t) * N_ADVERTISE)) {
+                        log_debug("ethtool: autonegotiation is enabled, ignoring speed, duplex, or port settings.");
+                        speed = 0;
+                        duplex = _DUP_INVALID;
+                        port = _NET_DEV_PORT_INVALID;
+                } else {
+                        log_debug("ethtool: setting speed, duplex, or port, disabling autonegotiation.");
+                        autonegotiation = AUTONEG_DISABLE;
+                }
+        }
+
+        r = ethtool_connect(fd);
+        if (r < 0)
+                return r;
+
+        strscpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+
+        r = get_glinksettings(*fd, &ifr, &u);
+        if (r < 0) {
+                r = get_gset(*fd, &ifr, &u);
+                if (r < 0)
+                        return log_debug_errno(r, "ethtool: Cannot get device settings for %s: %m", ifname);
+        }
+
+        if (speed > 0)
+                UPDATE(u->base.speed, DIV_ROUND_UP(speed, 1000000), changed);
+
+        if (duplex >= 0)
+                UPDATE(u->base.duplex, duplex, changed);
+
+        if (port >= 0)
+                UPDATE(u->base.port, port, changed);
+
+        if (autonegotiation >= 0)
+                UPDATE(u->base.autoneg, autonegotiation, changed);
+
+        if (!memeqzero(advertise, sizeof(uint32_t) * N_ADVERTISE)) {
+                UPDATE(u->base.autoneg, AUTONEG_ENABLE, changed);
+
+                changed = changed ||
+                        memcmp(&u->link_modes.advertising, advertise, sizeof(uint32_t) * N_ADVERTISE) != 0 ||
+                        !memeqzero((uint8_t*) &u->link_modes.advertising + sizeof(uint32_t) * N_ADVERTISE,
+                                   ETHTOOL_LINK_MODE_MASK_MAX_KERNEL_NBYTES - sizeof(uint32_t) * N_ADVERTISE);
+                memcpy(&u->link_modes.advertising, advertise, sizeof(uint32_t) * N_ADVERTISE);
+                memzero((uint8_t*) &u->link_modes.advertising + sizeof(uint32_t) * N_ADVERTISE,
+                        ETHTOOL_LINK_MODE_MASK_MAX_KERNEL_NBYTES - sizeof(uint32_t) * N_ADVERTISE);
+        }
+
+        if (mdi != ETH_TP_MDI_INVALID) {
+                if (u->base.eth_tp_mdix_ctrl == ETH_TP_MDI_INVALID)
+                        log_debug("ethtool: setting MDI not supported for %s, ignoring.", ifname);
+                else
+                        UPDATE(u->base.eth_tp_mdix_ctrl, mdi, changed);
+        }
+
+        if (!changed)
+                return 0;
+
+        if (u->base.cmd == ETHTOOL_GLINKSETTINGS)
+                r = set_slinksettings(*fd, &ifr, u);
+        else
+                r = set_sset(*fd, &ifr, u);
+        if (r < 0)
+                return log_debug_errno(r, "ethtool: Cannot set device settings for %s: %m", ifname);
+
+        return r;
+}
+
+int ethtool_set_channels(int *fd, const char *ifname, const netdev_channels *channels) {
+        struct ethtool_channels ecmd = {
+                .cmd = ETHTOOL_GCHANNELS,
+        };
+        struct ifreq ifr = {
+                .ifr_data = (void*) &ecmd,
+        };
+        bool need_update = false;
+        int r;
+
+        assert(fd);
+        assert(ifname);
+        assert(channels);
+
+        if (!channels->rx.set &&
+            !channels->tx.set &&
+            !channels->other.set &&
+            !channels->combined.set)
+                return 0;
+
+        r = ethtool_connect(fd);
+        if (r < 0)
+                return r;
+
+        strscpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+
+        if (ioctl(*fd, SIOCETHTOOL, &ifr) < 0)
+                return -errno;
+
+        if (channels->rx.set)
+                UPDATE_WITH_MAX(ecmd.rx_count, ecmd.max_rx, channels->rx.value, need_update);
+
+        if (channels->tx.set)
+                UPDATE_WITH_MAX(ecmd.tx_count, ecmd.max_tx, channels->tx.value, need_update);
+
+        if (channels->other.set)
+                UPDATE_WITH_MAX(ecmd.other_count, ecmd.max_other, channels->other.value, need_update);
+
+        if (channels->combined.set)
+                UPDATE_WITH_MAX(ecmd.combined_count, ecmd.max_combined, channels->combined.value, need_update);
+
+        if (!need_update)
+                return 0;
+
+        ecmd.cmd = ETHTOOL_SCHANNELS;
+        return RET_NERRNO(ioctl(*fd, SIOCETHTOOL, &ifr));
+}
+
+int ethtool_set_flow_control(int *fd, const char *ifname, int rx, int tx, int autoneg) {
+        struct ethtool_pauseparam ecmd = {
+                .cmd = ETHTOOL_GPAUSEPARAM,
+        };
+        struct ifreq ifr = {
+                .ifr_data = (void*) &ecmd,
+        };
+        bool need_update = false;
+        int r;
+
+        assert(fd);
+        assert(ifname);
+
+        if (rx < 0 && tx < 0 && autoneg < 0)
+                return 0;
+
+        r = ethtool_connect(fd);
+        if (r < 0)
+                return r;
+
+        strscpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+
+        if (ioctl(*fd, SIOCETHTOOL, &ifr) < 0)
+                return -errno;
+
+        if (rx >= 0)
+                UPDATE(ecmd.rx_pause, (uint32_t) rx, need_update);
+
+        if (tx >= 0)
+                UPDATE(ecmd.tx_pause, (uint32_t) tx, need_update);
+
+        if (autoneg >= 0)
+                UPDATE(ecmd.autoneg, (uint32_t) autoneg, need_update);
+
+        if (!need_update)
+                return 0;
+
+        ecmd.cmd = ETHTOOL_SPAUSEPARAM;
+        return RET_NERRNO(ioctl(*fd, SIOCETHTOOL, &ifr));
+}
+
+int ethtool_set_nic_coalesce_settings(int *ethtool_fd, const char *ifname, const netdev_coalesce_param *coalesce) {
+        struct ethtool_coalesce ecmd = {
+                .cmd = ETHTOOL_GCOALESCE,
+        };
+        struct ifreq ifr = {
+                .ifr_data = (void*) &ecmd,
+        };
+        bool need_update = false;
+        int r;
+
+        assert(ethtool_fd);
+        assert(ifname);
+        assert(coalesce);
+
+        if (coalesce->use_adaptive_rx_coalesce < 0 &&
+            coalesce->use_adaptive_tx_coalesce < 0 &&
+            !coalesce->rx_coalesce_usecs.set &&
+            !coalesce->rx_max_coalesced_frames.set &&
+            !coalesce->rx_coalesce_usecs_irq.set &&
+            !coalesce->rx_max_coalesced_frames_irq.set &&
+            !coalesce->tx_coalesce_usecs.set &&
+            !coalesce->tx_max_coalesced_frames.set &&
+            !coalesce->tx_coalesce_usecs_irq.set &&
+            !coalesce->tx_max_coalesced_frames_irq.set &&
+            !coalesce->stats_block_coalesce_usecs.set &&
+            !coalesce->pkt_rate_low.set &&
+            !coalesce->rx_coalesce_usecs_low.set &&
+            !coalesce->rx_max_coalesced_frames_low.set &&
+            !coalesce->tx_coalesce_usecs_low.set &&
+            !coalesce->tx_max_coalesced_frames_low.set &&
+            !coalesce->pkt_rate_high.set &&
+            !coalesce->rx_coalesce_usecs_high.set &&
+            !coalesce->rx_max_coalesced_frames_high.set &&
+            !coalesce->tx_coalesce_usecs_high.set &&
+            !coalesce->tx_max_coalesced_frames_high.set &&
+            !coalesce->rate_sample_interval.set)
+                return 0;
+
+        r = ethtool_connect(ethtool_fd);
+        if (r < 0)
+                return r;
+
+        strscpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+
+        if (ioctl(*ethtool_fd, SIOCETHTOOL, &ifr) < 0)
+                return -errno;
+
+        if (coalesce->use_adaptive_rx_coalesce >= 0)
+                UPDATE(ecmd.use_adaptive_rx_coalesce, (uint32_t) coalesce->use_adaptive_rx_coalesce, need_update);
+
+        if (coalesce->use_adaptive_tx_coalesce >= 0)
+                UPDATE(ecmd.use_adaptive_tx_coalesce, (uint32_t) coalesce->use_adaptive_tx_coalesce, need_update);
+
+        if (coalesce->rx_coalesce_usecs.set)
+                UPDATE(ecmd.rx_coalesce_usecs, coalesce->rx_coalesce_usecs.value, need_update);
+
+        if (coalesce->rx_max_coalesced_frames.set)
+                UPDATE(ecmd.rx_max_coalesced_frames, coalesce->rx_max_coalesced_frames.value, need_update);
+
+        if (coalesce->rx_coalesce_usecs_irq.set)
+                UPDATE(ecmd.rx_coalesce_usecs_irq, coalesce->rx_coalesce_usecs_irq.value, need_update);
+
+        if (coalesce->rx_max_coalesced_frames_irq.set)
+                UPDATE(ecmd.rx_max_coalesced_frames_irq, coalesce->rx_max_coalesced_frames_irq.value, need_update);
+
+        if (coalesce->tx_coalesce_usecs.set)
+                UPDATE(ecmd.tx_coalesce_usecs, coalesce->tx_coalesce_usecs.value, need_update);
+
+        if (coalesce->tx_max_coalesced_frames.set)
+                UPDATE(ecmd.tx_max_coalesced_frames, coalesce->tx_max_coalesced_frames.value, need_update);
+
+        if (coalesce->tx_coalesce_usecs_irq.set)
+                UPDATE(ecmd.tx_coalesce_usecs_irq, coalesce->tx_coalesce_usecs_irq.value, need_update);
+
+        if (coalesce->tx_max_coalesced_frames_irq.set)
+                UPDATE(ecmd.tx_max_coalesced_frames_irq, coalesce->tx_max_coalesced_frames_irq.value, need_update);
+
+        if (coalesce->stats_block_coalesce_usecs.set)
+                UPDATE(ecmd.stats_block_coalesce_usecs, coalesce->stats_block_coalesce_usecs.value, need_update);
+
+        if (coalesce->pkt_rate_low.set)
+                UPDATE(ecmd.pkt_rate_low, coalesce->pkt_rate_low.value, need_update);
+
+        if (coalesce->rx_coalesce_usecs_low.set)
+                UPDATE(ecmd.rx_coalesce_usecs_low, coalesce->rx_coalesce_usecs_low.value, need_update);
+
+        if (coalesce->rx_max_coalesced_frames_low.set)
+                UPDATE(ecmd.rx_max_coalesced_frames_low, coalesce->rx_max_coalesced_frames_low.value, need_update);
+
+        if (coalesce->tx_coalesce_usecs_low.set)
+                UPDATE(ecmd.tx_coalesce_usecs_low, coalesce->tx_coalesce_usecs_low.value, need_update);
+
+        if (coalesce->tx_max_coalesced_frames_low.set)
+                UPDATE(ecmd.tx_max_coalesced_frames_low, coalesce->tx_max_coalesced_frames_low.value, need_update);
+
+        if (coalesce->pkt_rate_high.set)
+                UPDATE(ecmd.pkt_rate_high, coalesce->pkt_rate_high.value, need_update);
+
+        if (coalesce->rx_coalesce_usecs_high.set)
+                UPDATE(ecmd.rx_coalesce_usecs_high, coalesce->rx_coalesce_usecs_high.value, need_update);
+
+        if (coalesce->rx_max_coalesced_frames_high.set)
+                UPDATE(ecmd.rx_max_coalesced_frames_high, coalesce->rx_max_coalesced_frames_high.value, need_update);
+
+        if (coalesce->tx_coalesce_usecs_high.set)
+                UPDATE(ecmd.tx_coalesce_usecs_high, coalesce->tx_coalesce_usecs_high.value, need_update);
+
+        if (coalesce->tx_max_coalesced_frames_high.set)
+                UPDATE(ecmd.tx_max_coalesced_frames_high, coalesce->tx_max_coalesced_frames_high.value, need_update);
+
+        if (coalesce->rate_sample_interval.set)
+                UPDATE(ecmd.rate_sample_interval, DIV_ROUND_UP(coalesce->rate_sample_interval.value, USEC_PER_SEC), need_update);
+
+        if (!need_update)
+                return 0;
+
+        ecmd.cmd = ETHTOOL_SCOALESCE;
+        return RET_NERRNO(ioctl(*ethtool_fd, SIOCETHTOOL, &ifr));
+}
+
+int config_parse_advertise(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        uint32_t *advertise = ASSERT_PTR(data);
+        int r;
+
+        assert(filename);
+        assert(section);
+        assert(lvalue);
+        assert(rvalue);
+
+        if (isempty(rvalue)) {
+                /* Empty string resets the value. */
+                memzero(advertise, sizeof(uint32_t) * N_ADVERTISE);
+                return 0;
+        }
+
+        for (const char *p = rvalue;;) {
+                _cleanup_free_ char *w = NULL;
+                enum ethtool_link_mode_bit_indices mode;
+
+                r = extract_first_word(&p, &w, NULL, 0);
+                if (r == -ENOMEM)
+                        return log_oom();
+                if (r < 0) {
+                        log_syntax(unit, LOG_WARNING, filename, line, r,
+                                   "Failed to split advertise modes '%s', ignoring assignment: %m", rvalue);
+                        return 0;
+                }
+                if (r == 0)
+                        return 0;
+
+                mode = ethtool_link_mode_bit_from_string(w);
+                /* We reuse the kernel provided enum which does not contain negative value. So, the cast
+                 * below is mandatory. Otherwise, the check below always passes and access an invalid address. */
+                if ((int) mode < 0) {
+                        log_syntax(unit, LOG_WARNING, filename, line, mode,
+                                   "Failed to parse advertise mode, ignoring: %s", w);
+                        continue;
+                }
+
+                advertise[mode / 32] |= 1UL << (mode % 32);
+        }
+}
+
+int config_parse_mdi(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        uint8_t *mdi = ASSERT_PTR(data);
+
+        assert(filename);
+        assert(rvalue);
+
+        if (isempty(rvalue)) {
+                *mdi = ETH_TP_MDI_INVALID;
+                return 0;
+        }
+
+        if (STR_IN_SET(rvalue, "mdi", "straight")) {
+                *mdi = ETH_TP_MDI;
+                return 0;
+        }
+
+        if (STR_IN_SET(rvalue, "mdi-x", "mdix", "crossover")) {
+                *mdi = ETH_TP_MDI_X;
+                return 0;
+        }
+
+        if (streq(rvalue, "auto")) {
+                *mdi = ETH_TP_MDI_AUTO;
+                return 0;
+        }
+
+        log_syntax(unit, LOG_WARNING, filename, line, 0,
+                   "Failed to parse %s= setting, ignoring assignment: %s", lvalue, rvalue);
+        return 0;
+}
+
+int config_parse_ring_buffer_or_channel(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        u32_opt *dst = ASSERT_PTR(data);
+        uint32_t k;
+        int r;
+
+        assert(filename);
+        assert(section);
+        assert(lvalue);
+        assert(rvalue);
+
+        if (isempty(rvalue)) {
+                dst->value = 0;
+                dst->set = false;
+                return 0;
+        }
+
+        if (streq(rvalue, "max")) {
+                dst->value = 0;
+                dst->set = true;
+                return 0;
+        }
+
+        r = safe_atou32(rvalue, &k);
+        if (r < 0) {
+                log_syntax(unit, LOG_WARNING, filename, line, r,
+                           "Failed to parse %s=, ignoring: %s", lvalue, rvalue);
+                return 0;
+        }
+        if (k < 1) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0,
+                           "Invalid %s= value, ignoring: %s", lvalue, rvalue);
+                return 0;
+        }
+
+        dst->value = k;
+        dst->set = true;
+        return 0;
+}
+
+int config_parse_wol(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        uint32_t new_opts = 0, *opts = data;
+        int r;
+
+        assert(filename);
+        assert(section);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        if (isempty(rvalue)) {
+                *opts = UINT32_MAX; /* Do not update WOL option. */
+                return 0;
+        }
+
+        if (streq(rvalue, "off")) {
+                *opts = 0; /* Disable WOL. */
+                return 0;
+        }
+
+        for (const char *p = rvalue;;) {
+                _cleanup_free_ char *w = NULL;
+                bool found = false;
+
+                r = extract_first_word(&p, &w, NULL, 0);
+                if (r == -ENOMEM)
+                        return log_oom();
+                if (r < 0) {
+                        log_syntax(unit, LOG_WARNING, filename, line, r,
+                                   "Failed to split wake-on-lan modes '%s', ignoring assignment: %m", rvalue);
+                        return 0;
+                }
+                if (r == 0)
+                        break;
+
+                for (size_t i = 0; i < ELEMENTSOF(wol_option_map); i++)
+                        if (streq(w, wol_option_map[i].name)) {
+                                new_opts |= wol_option_map[i].opt;
+                                found = true;
+                                break;
+                        }
+
+                if (!found)
+                        log_syntax(unit, LOG_WARNING, filename, line, 0,
+                                   "Unknown wake-on-lan mode '%s', ignoring.", w);
+        }
+
+        if (*opts == UINT32_MAX)
+                *opts = new_opts;
+        else
+                *opts |= new_opts;
+
+        return 0;
+}
+
+int config_parse_coalesce_u32(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+        u32_opt *dst = data;
+        uint32_t k;
+        int r;
+
+        if (isempty(rvalue)) {
+                dst->value = 0;
+                dst->set = false;
+                return 0;
+        }
+
+        r = safe_atou32(rvalue, &k);
+        if (r < 0) {
+                log_syntax(unit, LOG_WARNING, filename, line, r,
+                           "Failed to parse %s=, ignoring: %s", lvalue, rvalue);
+                return 0;
+        }
+
+        dst->value = k;
+        dst->set = true;
+        return 0;
+}
+
+int config_parse_coalesce_sec(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+        u32_opt *dst = data;
+        usec_t usec;
+        int r;
+
+        if (isempty(rvalue)) {
+                dst->value = 0;
+                dst->set = false;
+                return 0;
+        }
+
+        r = parse_sec(rvalue, &usec);
+        if (r < 0) {
+                log_syntax(unit, LOG_WARNING, filename, line, r,
+                           "Failed to parse coalesce setting value, ignoring: %s", rvalue);
+                return 0;
+        }
+
+        if (usec > UINT32_MAX) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0,
+                           "Too large %s= value, ignoring: %s", lvalue, rvalue);
+                return 0;
+        }
+
+        if (STR_IN_SET(lvalue, "StatisticsBlockCoalesceSec", "CoalescePacketRateSampleIntervalSec") && usec < 1) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0,
+                           "Invalid %s= value, ignoring: %s", lvalue, rvalue);
+                return 0;
+        }
+
+        dst->value = (uint32_t) usec;
+        dst->set = true;
+
+        return 0;
+}