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From a1661a140c97a9e8fd90ee00f2de6baa214c9076 Mon Sep 17 00:00:00 2001
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From: Daan De Meyer <daan.j.demeyer@gmail.com>
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Date: Wed, 18 Aug 2021 13:52:00 +0100
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Subject: [PATCH] udev: Add support for configuring nic coalescing settings
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These are configured via the corresponding ethtool ioctl.
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---
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 man/systemd.link.xml                       |  71 +++++++
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 src/shared/ethtool-util.c                  | 205 +++++++++++++++++++++
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 src/shared/ethtool-util.h                  |  29 +++
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 src/udev/net/link-config-gperf.gperf       | 124 ++++++++-----
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 src/udev/net/link-config.c                 |   4 +
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 src/udev/net/link-config.h                 |   1 +
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 test/fuzz/fuzz-link-parser/directives.link |  22 +++
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 7 files changed, 405 insertions(+), 51 deletions(-)
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diff --git a/man/systemd.link.xml b/man/systemd.link.xml
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index dfb02073b2..6d8dcb9af7 100644
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--- a/man/systemd.link.xml
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+++ b/man/systemd.link.xml
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@@ -773,6 +773,77 @@
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           accept. An unsigned integer in the range 1…65535. Defaults to unset.</para>
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         </listitem>
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       </varlistentry>
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+      <varlistentry>
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+        <term><varname>UseAdaptiveRxCoalesce=</varname></term>
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+        <term><varname>UseAdaptiveTxCoalesce=</varname></term>
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+        <listitem>
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+          <para>Boolean properties that, when set, enable/disable adaptive Rx/Tx coalescing if the hardware
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+          supports it. When unset, the kernel's default will be used.</para>
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+        </listitem>
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+      </varlistentry>
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+      <varlistentry>
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+        <term><varname>RxCoalesceSec=</varname></term>
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+        <term><varname>RxCoalesceIrqSec=</varname></term>
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+        <term><varname>RxCoalesceLowSec=</varname></term>
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+        <term><varname>RxCoalesceHighSec=</varname></term>
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+        <term><varname>TxCoalesceSec=</varname></term>
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+        <term><varname>TxCoalesceIrqSec=</varname></term>
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+        <term><varname>TxCoalesceLowSec=</varname></term>
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+        <term><varname>TxCoalesceHighSec=</varname></term>
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+        <listitem>
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+          <para>These properties configure the delay before Rx/Tx interrupts are generated after a packet is
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+          sent/received. The <literal>Irq</literal> properties come into effect when the host is servicing an
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+          IRQ. The <literal>Low</literal> and <literal>High</literal> properties come into effect when the
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+          packet rate drops below the low packet rate threshold or exceeds the high packet rate threshold
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+          respectively if adaptive Rx/Tx coalescing is enabled. When unset, the kernel's defaults will be
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+          used.</para>
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+        </listitem>
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+      </varlistentry>
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+        <varlistentry>
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+        <term><varname>RxMaxCoalescedFrames=</varname></term>
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+        <term><varname>RxMaxCoalescedIrqFrames=</varname></term>
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+        <term><varname>RxMaxCoalescedLowFrames=</varname></term>
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+        <term><varname>RxMaxCoalescedHighFrames=</varname></term>
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+        <term><varname>TxMaxCoalescedFrames=</varname></term>
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+        <term><varname>TxMaxCoalescedIrqFrames=</varname></term>
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+        <term><varname>TxMaxCoalescedLowFrames=</varname></term>
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+        <term><varname>TxMaxCoalescedHighFrames=</varname></term>
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+        <listitem>
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+          <para>These properties configure the maximum number of frames that are sent/received before a Rx/Tx
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+          interrupt is generated. The <literal>Irq</literal> properties come into effect when the host is
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+          servicing an IRQ. The <literal>Low</literal> and <literal>High</literal> properties come into
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+          effect when the packet rate drops below the low packet rate threshold or exceeds the high packet
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+          rate threshold respectively if adaptive Rx/Tx coalescing is enabled. When unset, the kernel's
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+          defaults will be used.</para>
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+        </listitem>
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+      </varlistentry>
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+      <varlistentry>
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+        <term><varname>CoalescePacketRateLow=</varname></term>
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+        <term><varname>CoalescePacketRateHigh=</varname></term>
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+        <listitem>
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+          <para>These properties configure the low and high packet rate (expressed in packets per second)
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+          threshold respectively and are used to determine when the corresponding coalescing settings for low
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+          and high packet rates come into effect if adaptive Rx/Tx coalescing is enabled. If unset, the
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+          kernel's defaults will be used.</para>
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+        </listitem>
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+      </varlistentry>
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+      <varlistentry>
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+        <term><varname>CoalescePacketRateSampleIntervalSec=</varname></term>
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+        <listitem>
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+          <para>Configures how often to sample the packet rate used for adaptive Rx/Tx coalescing. This
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+          property cannot be zero. This lowest time granularity supported by this property is seconds.
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+          Partial seconds will be rounded up before being passed to the kernel. If unset, the kernel's
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+          default will be used.</para>
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+        </listitem>
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+      </varlistentry>
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+      <varlistentry>
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+        <term><varname>StatisticsBlockCoalesceSec=</varname></term>
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+        <listitem>
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+          <para>How long to delay driver in-memory statistics block updates. If the driver does not have an
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+          in-memory statistic block, this property is ignored. This property cannot be zero. If unset, the
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+          kernel's default will be used.</para>
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+        </listitem>
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+      </varlistentry>
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     </variablelist>
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   </refsect1>
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diff --git a/src/shared/ethtool-util.c b/src/shared/ethtool-util.c
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index 2d41d861ba..f7f553dd29 100644
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--- a/src/shared/ethtool-util.c
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+++ b/src/shared/ethtool-util.c
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@@ -14,6 +14,7 @@
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 #include "memory-util.h"
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 #include "socket-util.h"
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 #include "string-table.h"
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+#include "strv.h"
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 #include "strxcpyx.h"
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 static const char* const duplex_table[_DUP_MAX] = {
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@@ -1091,3 +1092,207 @@ int config_parse_wol(
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         return 0;
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 }
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+
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+int config_parse_coalesce_u32(
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+                const char *unit,
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+                const char *filename,
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+                unsigned line,
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+                const char *section,
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+                unsigned section_line,
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+                const char *lvalue,
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+                int ltype,
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+                const char *rvalue,
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+                void *data,
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+                void *userdata) {
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+        u32_opt *dst = data;
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+        uint32_t k;
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+        int r;
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+
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+        if (isempty(rvalue)) {
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+                dst->value = 0;
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+                dst->set = false;
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+                return 0;
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+        }
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+
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+        r = safe_atou32(rvalue, &k);
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+        if (r < 0) {
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+                log_syntax(unit, LOG_WARNING, filename, line, r,
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+                           "Failed to parse %s=, ignoring: %s", lvalue, rvalue);
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+                return 0;
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+        }
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+
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+        dst->value = k;
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+        dst->set = true;
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+        return 0;
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+}
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+
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+int config_parse_coalesce_sec(
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+                const char *unit,
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+                const char *filename,
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+                unsigned line,
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+                const char *section,
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+                unsigned section_line,
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+                const char *lvalue,
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+                int ltype,
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+                const char *rvalue,
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+                void *data,
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+                void *userdata) {
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+        u32_opt *dst = data;
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+        usec_t usec;
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+        int r;
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+
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+        if (isempty(rvalue)) {
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+                dst->value = 0;
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+                dst->set = false;
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+                return 0;
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+        }
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+
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+        r = parse_sec(rvalue, &usec);
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+        if (r < 0) {
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+                log_syntax(unit, LOG_WARNING, filename, line, r,
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+                           "Failed to parse coalesce setting value, ignoring: %s", rvalue);
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+                return 0;
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+        }
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+
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+        if (usec > UINT32_MAX) {
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+                log_syntax(unit, LOG_WARNING, filename, line, 0,
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+                           "Too large %s= value, ignoring: %s", lvalue, rvalue);
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+                return 0;
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+        }
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+
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+        if (STR_IN_SET(lvalue, "StatisticsBlockCoalesceSec", "CoalescePacketRateSampleIntervalSec") && usec < 1) {
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+                log_syntax(unit, LOG_WARNING, filename, line, 0,
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+                           "Invalid %s= value, ignoring: %s", lvalue, rvalue);
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+                return 0;
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+        }
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+
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+        dst->value = (uint32_t) usec;
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+        dst->set = true;
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+
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+        return 0;
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+}
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+
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+int ethtool_set_nic_coalesce_settings(int *ethtool_fd, const char *ifname, const netdev_coalesce_param *coalesce) {
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+        struct ethtool_coalesce ecmd = {
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+                .cmd = ETHTOOL_GCOALESCE,
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+        };
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+        struct ifreq ifr = {
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+                .ifr_data = (void*) &ecmd,
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+        };
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+        bool need_update = false;
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+        int r;
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+
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+        assert(ethtool_fd);
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+        assert(ifname);
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+        assert(coalesce);
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+
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+        if (coalesce->use_adaptive_rx_coalesce < 0 &&
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+            coalesce->use_adaptive_tx_coalesce < 0 &&
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+            !coalesce->rx_coalesce_usecs.set &&
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+            !coalesce->rx_max_coalesced_frames.set &&
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+            !coalesce->rx_coalesce_usecs_irq.set &&
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+            !coalesce->rx_max_coalesced_frames_irq.set &&
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+            !coalesce->tx_coalesce_usecs.set &&
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+            !coalesce->tx_max_coalesced_frames.set &&
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+            !coalesce->tx_coalesce_usecs_irq.set &&
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+            !coalesce->tx_max_coalesced_frames_irq.set &&
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+            !coalesce->stats_block_coalesce_usecs.set &&
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+            !coalesce->pkt_rate_low.set &&
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+            !coalesce->rx_coalesce_usecs_low.set &&
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+            !coalesce->rx_max_coalesced_frames_low.set &&
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+            !coalesce->tx_coalesce_usecs_low.set &&
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+            !coalesce->tx_max_coalesced_frames_low.set &&
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+            !coalesce->pkt_rate_high.set &&
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+            !coalesce->rx_coalesce_usecs_high.set &&
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+            !coalesce->rx_max_coalesced_frames_high.set &&
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+            !coalesce->tx_coalesce_usecs_high.set &&
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+            !coalesce->tx_max_coalesced_frames_high.set &&
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+            !coalesce->rate_sample_interval.set)
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+                return 0;
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+
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+        r = ethtool_connect(ethtool_fd);
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+        if (r < 0)
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+                return r;
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+
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+        strscpy(ifr.ifr_name, IFNAMSIZ, ifname);
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+
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+        r = ioctl(*ethtool_fd, SIOCETHTOOL, &ifr);
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+        if (r < 0)
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+                return -errno;
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+
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+        if (coalesce->use_adaptive_rx_coalesce >= 0)
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+                UPDATE(ecmd.use_adaptive_rx_coalesce, (uint32_t) coalesce->use_adaptive_rx_coalesce, need_update);
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+
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+        if (coalesce->use_adaptive_tx_coalesce >= 0)
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+                UPDATE(ecmd.use_adaptive_tx_coalesce, (uint32_t) coalesce->use_adaptive_tx_coalesce, need_update);
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+
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+        if (coalesce->rx_coalesce_usecs.set)
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+                UPDATE(ecmd.rx_coalesce_usecs, coalesce->rx_coalesce_usecs.value, need_update);
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+
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+        if (coalesce->rx_max_coalesced_frames.set)
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+                UPDATE(ecmd.rx_max_coalesced_frames, coalesce->rx_max_coalesced_frames.value, need_update);
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+
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+        if (coalesce->rx_coalesce_usecs_irq.set)
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+                UPDATE(ecmd.rx_coalesce_usecs_irq, coalesce->rx_coalesce_usecs_irq.value, need_update);
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+
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+        if (coalesce->rx_max_coalesced_frames_irq.set)
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+                UPDATE(ecmd.rx_max_coalesced_frames_irq, coalesce->rx_max_coalesced_frames_irq.value, need_update);
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+
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+        if (coalesce->tx_coalesce_usecs.set)
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+                UPDATE(ecmd.tx_coalesce_usecs, coalesce->tx_coalesce_usecs.value, need_update);
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+
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+        if (coalesce->tx_max_coalesced_frames.set)
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+                UPDATE(ecmd.tx_max_coalesced_frames, coalesce->tx_max_coalesced_frames.value, need_update);
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+
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+        if (coalesce->tx_coalesce_usecs_irq.set)
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+                UPDATE(ecmd.tx_coalesce_usecs_irq, coalesce->tx_coalesce_usecs_irq.value, need_update);
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+
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+        if (coalesce->tx_max_coalesced_frames_irq.set)
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+                UPDATE(ecmd.tx_max_coalesced_frames_irq, coalesce->tx_max_coalesced_frames_irq.value, need_update);
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+
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+        if (coalesce->stats_block_coalesce_usecs.set)
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+                UPDATE(ecmd.stats_block_coalesce_usecs, coalesce->stats_block_coalesce_usecs.value, need_update);
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+
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+        if (coalesce->pkt_rate_low.set)
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+                UPDATE(ecmd.pkt_rate_low, coalesce->pkt_rate_low.value, need_update);
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+
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+        if (coalesce->rx_coalesce_usecs_low.set)
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+                UPDATE(ecmd.rx_coalesce_usecs_low, coalesce->rx_coalesce_usecs_low.value, need_update);
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+
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+        if (coalesce->rx_max_coalesced_frames_low.set)
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+                UPDATE(ecmd.rx_max_coalesced_frames_low, coalesce->rx_max_coalesced_frames_low.value, need_update);
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+
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+        if (coalesce->tx_coalesce_usecs_low.set)
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+                UPDATE(ecmd.tx_coalesce_usecs_low, coalesce->tx_coalesce_usecs_low.value, need_update);
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+
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+        if (coalesce->tx_max_coalesced_frames_low.set)
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+                UPDATE(ecmd.tx_max_coalesced_frames_low, coalesce->tx_max_coalesced_frames_low.value, need_update);
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+
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+        if (coalesce->pkt_rate_high.set)
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+                UPDATE(ecmd.pkt_rate_high, coalesce->pkt_rate_high.value, need_update);
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+
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+        if (coalesce->rx_coalesce_usecs_high.set)
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+                UPDATE(ecmd.rx_coalesce_usecs_high, coalesce->rx_coalesce_usecs_high.value, need_update);
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+
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+        if (coalesce->rx_max_coalesced_frames_high.set)
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+                UPDATE(ecmd.rx_max_coalesced_frames_high, coalesce->rx_max_coalesced_frames_high.value, need_update);
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+
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+        if (coalesce->tx_coalesce_usecs_high.set)
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+                UPDATE(ecmd.tx_coalesce_usecs_high, coalesce->tx_coalesce_usecs_high.value, need_update);
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+
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+        if (coalesce->tx_max_coalesced_frames_high.set)
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+                UPDATE(ecmd.tx_max_coalesced_frames_high, coalesce->tx_max_coalesced_frames_high.value, need_update);
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+
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+        if (coalesce->rate_sample_interval.set)
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+                UPDATE(ecmd.rate_sample_interval, DIV_ROUND_UP(coalesce->rate_sample_interval.value, USEC_PER_SEC), need_update);
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+
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+        if (!need_update)
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+                return 0;
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+
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+        ecmd.cmd = ETHTOOL_SCOALESCE;
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+        r = ioctl(*ethtool_fd, SIOCETHTOOL, &ifr);
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+        if (r < 0)
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+                return -errno;
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+
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+        return 0;
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+}
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diff --git a/src/shared/ethtool-util.h b/src/shared/ethtool-util.h
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index 8fdbdec39a..bb0333775c 100644
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--- a/src/shared/ethtool-util.h
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+++ b/src/shared/ethtool-util.h
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@@ -76,6 +76,31 @@ typedef struct netdev_ring_param {
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         u32_opt tx;
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 } netdev_ring_param;
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+typedef struct netdev_coalesce_param {
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+        u32_opt rx_coalesce_usecs;
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+        u32_opt rx_max_coalesced_frames;
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+        u32_opt rx_coalesce_usecs_irq;
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+        u32_opt rx_max_coalesced_frames_irq;
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+        u32_opt tx_coalesce_usecs;
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+        u32_opt tx_max_coalesced_frames;
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+        u32_opt tx_coalesce_usecs_irq;
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+        u32_opt tx_max_coalesced_frames_irq;
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+        u32_opt stats_block_coalesce_usecs;
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+        int use_adaptive_rx_coalesce;
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+        int use_adaptive_tx_coalesce;
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+        u32_opt pkt_rate_low;
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+        u32_opt rx_coalesce_usecs_low;
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+        u32_opt rx_max_coalesced_frames_low;
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+        u32_opt tx_coalesce_usecs_low;
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+        u32_opt tx_max_coalesced_frames_low;
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+        u32_opt pkt_rate_high;
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+        u32_opt rx_coalesce_usecs_high;
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+        u32_opt rx_max_coalesced_frames_high;
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+        u32_opt tx_coalesce_usecs_high;
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+        u32_opt tx_max_coalesced_frames_high;
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+        u32_opt rate_sample_interval;
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+} netdev_coalesce_param;
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+
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 int ethtool_get_driver(int *ethtool_fd, const char *ifname, char **ret);
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 int ethtool_get_link_info(int *ethtool_fd, const char *ifname,
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                           int *ret_autonegotiation, uint64_t *ret_speed,
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@@ -89,6 +114,7 @@ int ethtool_set_glinksettings(int *ethtool_fd, const char *ifname,
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                               uint64_t speed, Duplex duplex, NetDevPort port);
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 int ethtool_set_channels(int *ethtool_fd, const char *ifname, const netdev_channels *channels);
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 int ethtool_set_flow_control(int *fd, const char *ifname, int rx, int tx, int autoneg);
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+int ethtool_set_nic_coalesce_settings(int *ethtool_fd, const char *ifname, const netdev_coalesce_param *coalesce);
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 const char *duplex_to_string(Duplex d) _const_;
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 Duplex duplex_from_string(const char *d) _pure_;
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@@ -106,3 +132,6 @@ CONFIG_PARSER_PROTOTYPE(config_parse_wol);
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 CONFIG_PARSER_PROTOTYPE(config_parse_port);
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 CONFIG_PARSER_PROTOTYPE(config_parse_advertise);
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 CONFIG_PARSER_PROTOTYPE(config_parse_ring_buffer_or_channel);
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+CONFIG_PARSER_PROTOTYPE(config_parse_coalesce_u32);
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+CONFIG_PARSER_PROTOTYPE(config_parse_coalesce_sec);
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+CONFIG_PARSER_PROTOTYPE(config_parse_nic_coalesce_setting);
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diff --git a/src/udev/net/link-config-gperf.gperf b/src/udev/net/link-config-gperf.gperf
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index d0190da5cb..f800de8386 100644
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--- a/src/udev/net/link-config-gperf.gperf
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+++ b/src/udev/net/link-config-gperf.gperf
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@@ -21,54 +21,76 @@ struct ConfigPerfItem;
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 %struct-type
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 %includes
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 %%
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-Match.MACAddress,                      config_parse_hwaddrs,                  0,                             offsetof(LinkConfig, match.mac)
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-Match.PermanentMACAddress,             config_parse_hwaddrs,                  0,                             offsetof(LinkConfig, match.permanent_mac)
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-Match.OriginalName,                    config_parse_match_ifnames,            0,                             offsetof(LinkConfig, match.ifname)
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-Match.Path,                            config_parse_match_strv,               0,                             offsetof(LinkConfig, match.path)
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-Match.Driver,                          config_parse_match_strv,               0,                             offsetof(LinkConfig, match.driver)
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-Match.Type,                            config_parse_match_strv,               0,                             offsetof(LinkConfig, match.iftype)
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-Match.Property,                        config_parse_match_property,           0,                             offsetof(LinkConfig, match.property)
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-Match.Host,                            config_parse_net_condition,            CONDITION_HOST,                offsetof(LinkConfig, conditions)
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-Match.Virtualization,                  config_parse_net_condition,            CONDITION_VIRTUALIZATION,      offsetof(LinkConfig, conditions)
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-Match.KernelCommandLine,               config_parse_net_condition,            CONDITION_KERNEL_COMMAND_LINE, offsetof(LinkConfig, conditions)
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-Match.KernelVersion,                   config_parse_net_condition,            CONDITION_KERNEL_VERSION,      offsetof(LinkConfig, conditions)
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-Match.Architecture,                    config_parse_net_condition,            CONDITION_ARCHITECTURE,        offsetof(LinkConfig, conditions)
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-Link.Description,                      config_parse_string,                   0,                             offsetof(LinkConfig, description)
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-Link.MACAddressPolicy,                 config_parse_mac_address_policy,       0,                             offsetof(LinkConfig, mac_address_policy)
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-Link.MACAddress,                       config_parse_hwaddr,                   0,                             offsetof(LinkConfig, mac)
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-Link.NamePolicy,                       config_parse_name_policy,              0,                             offsetof(LinkConfig, name_policy)
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-Link.Name,                             config_parse_ifname,                   0,                             offsetof(LinkConfig, name)
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-Link.AlternativeName,                  config_parse_ifnames,                  IFNAME_VALID_ALTERNATIVE,      offsetof(LinkConfig, alternative_names)
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-Link.AlternativeNamesPolicy,           config_parse_alternative_names_policy, 0,                             offsetof(LinkConfig, alternative_names_policy)
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-Link.Alias,                            config_parse_ifalias,                  0,                             offsetof(LinkConfig, alias)
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-Link.TransmitQueues,                   config_parse_rx_tx_queues,             0,                             offsetof(LinkConfig, txqueues)
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-Link.ReceiveQueues,                    config_parse_rx_tx_queues,             0,                             offsetof(LinkConfig, rxqueues)
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-Link.TransmitQueueLength,              config_parse_txqueuelen,               0,                             offsetof(LinkConfig, txqueuelen)
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-Link.MTUBytes,                         config_parse_mtu,                      AF_UNSPEC,                     offsetof(LinkConfig, mtu)
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-Link.BitsPerSecond,                    config_parse_si_uint64,                0,                             offsetof(LinkConfig, speed)
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-Link.Duplex,                           config_parse_duplex,                   0,                             offsetof(LinkConfig, duplex)
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-Link.AutoNegotiation,                  config_parse_tristate,                 0,                             offsetof(LinkConfig, autonegotiation)
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-Link.WakeOnLan,                        config_parse_wol,                      0,                             offsetof(LinkConfig, wol)
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-Link.Port,                             config_parse_port,                     0,                             offsetof(LinkConfig, port)
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-Link.ReceiveChecksumOffload,           config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_RX])
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-Link.TransmitChecksumOffload,          config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_TX])
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-Link.GenericSegmentationOffload,       config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_GSO])
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-Link.TCPSegmentationOffload,           config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_TSO])
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-Link.TCP6SegmentationOffload,          config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_TSO6])
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-Link.UDPSegmentationOffload,           config_parse_warn_compat,              DISABLED_LEGACY,               0
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-Link.GenericReceiveOffload,            config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_GRO])
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-Link.LargeReceiveOffload,              config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_LRO])
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-Link.RxChannels,                       config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, channels.rx)
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-Link.TxChannels,                       config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, channels.tx)
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-Link.OtherChannels,                    config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, channels.other)
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-Link.CombinedChannels,                 config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, channels.combined)
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-Link.Advertise,                        config_parse_advertise,                0,                             offsetof(LinkConfig, advertise)
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-Link.RxBufferSize,                     config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, ring.rx)
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-Link.RxMiniBufferSize,                 config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, ring.rx_mini)
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-Link.RxJumboBufferSize,                config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, ring.rx_jumbo)
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-Link.TxBufferSize,                     config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, ring.tx)
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-Link.RxFlowControl,                    config_parse_tristate,                 0,                             offsetof(LinkConfig, rx_flow_control)
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-Link.TxFlowControl,                    config_parse_tristate,                 0,                             offsetof(LinkConfig, tx_flow_control)
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-Link.AutoNegotiationFlowControl,       config_parse_tristate,                 0,                             offsetof(LinkConfig, autoneg_flow_control)
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-Link.GenericSegmentOffloadMaxBytes,    config_parse_iec_size,                 0,                             offsetof(LinkConfig, gso_max_size)
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-Link.GenericSegmentOffloadMaxSegments, config_parse_uint32,                   0,                             offsetof(LinkConfig, gso_max_segments)
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+Match.MACAddress,                         config_parse_hwaddrs,                  0,                             offsetof(LinkConfig, match.mac)
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+Match.PermanentMACAddress,                config_parse_hwaddrs,                  0,                             offsetof(LinkConfig, match.permanent_mac)
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+Match.OriginalName,                       config_parse_match_ifnames,            0,                             offsetof(LinkConfig, match.ifname)
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+Match.Path,                               config_parse_match_strv,               0,                             offsetof(LinkConfig, match.path)
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+Match.Driver,                             config_parse_match_strv,               0,                             offsetof(LinkConfig, match.driver)
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+Match.Type,                               config_parse_match_strv,               0,                             offsetof(LinkConfig, match.iftype)
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+Match.Property,                           config_parse_match_property,           0,                             offsetof(LinkConfig, match.property)
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+Match.Host,                               config_parse_net_condition,            CONDITION_HOST,                offsetof(LinkConfig, conditions)
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+Match.Virtualization,                     config_parse_net_condition,            CONDITION_VIRTUALIZATION,      offsetof(LinkConfig, conditions)
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+Match.KernelCommandLine,                  config_parse_net_condition,            CONDITION_KERNEL_COMMAND_LINE, offsetof(LinkConfig, conditions)
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+Match.KernelVersion,                      config_parse_net_condition,            CONDITION_KERNEL_VERSION,      offsetof(LinkConfig, conditions)
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+Match.Architecture,                       config_parse_net_condition,            CONDITION_ARCHITECTURE,        offsetof(LinkConfig, conditions)
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+Link.Description,                         config_parse_string,                   0,                             offsetof(LinkConfig, description)
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+Link.MACAddressPolicy,                    config_parse_mac_address_policy,       0,                             offsetof(LinkConfig, mac_address_policy)
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+Link.MACAddress,                          config_parse_hwaddr,                   0,                             offsetof(LinkConfig, mac)
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+Link.NamePolicy,                          config_parse_name_policy,              0,                             offsetof(LinkConfig, name_policy)
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+Link.Name,                                config_parse_ifname,                   0,                             offsetof(LinkConfig, name)
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+Link.AlternativeName,                     config_parse_ifnames,                  IFNAME_VALID_ALTERNATIVE,      offsetof(LinkConfig, alternative_names)
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+Link.AlternativeNamesPolicy,              config_parse_alternative_names_policy, 0,                             offsetof(LinkConfig, alternative_names_policy)
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+Link.Alias,                               config_parse_ifalias,                  0,                             offsetof(LinkConfig, alias)
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+Link.TransmitQueues,                      config_parse_rx_tx_queues,             0,                             offsetof(LinkConfig, txqueues)
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+Link.ReceiveQueues,                       config_parse_rx_tx_queues,             0,                             offsetof(LinkConfig, rxqueues)
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+Link.TransmitQueueLength,                 config_parse_txqueuelen,               0,                             offsetof(LinkConfig, txqueuelen)
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+Link.MTUBytes,                            config_parse_mtu,                      AF_UNSPEC,                     offsetof(LinkConfig, mtu)
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+Link.BitsPerSecond,                       config_parse_si_uint64,                0,                             offsetof(LinkConfig, speed)
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+Link.Duplex,                              config_parse_duplex,                   0,                             offsetof(LinkConfig, duplex)
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+Link.AutoNegotiation,                     config_parse_tristate,                 0,                             offsetof(LinkConfig, autonegotiation)
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+Link.WakeOnLan,                           config_parse_wol,                      0,                             offsetof(LinkConfig, wol)
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+Link.Port,                                config_parse_port,                     0,                             offsetof(LinkConfig, port)
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+Link.ReceiveChecksumOffload,              config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_RX])
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+Link.TransmitChecksumOffload,             config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_TX])
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+Link.GenericSegmentationOffload,          config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_GSO])
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+Link.TCPSegmentationOffload,              config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_TSO])
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+Link.TCP6SegmentationOffload,             config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_TSO6])
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+Link.UDPSegmentationOffload,              config_parse_warn_compat,              DISABLED_LEGACY,               0
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+Link.GenericReceiveOffload,               config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_GRO])
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+Link.LargeReceiveOffload,                 config_parse_tristate,                 0,                             offsetof(LinkConfig, features[NET_DEV_FEAT_LRO])
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+Link.RxChannels,                          config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, channels.rx)
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+Link.TxChannels,                          config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, channels.tx)
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+Link.OtherChannels,                       config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, channels.other)
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+Link.CombinedChannels,                    config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, channels.combined)
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+Link.Advertise,                           config_parse_advertise,                0,                             offsetof(LinkConfig, advertise)
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+Link.RxBufferSize,                        config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, ring.rx)
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+Link.RxMiniBufferSize,                    config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, ring.rx_mini)
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+Link.RxJumboBufferSize,                   config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, ring.rx_jumbo)
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+Link.TxBufferSize,                        config_parse_ring_buffer_or_channel,   0,                             offsetof(LinkConfig, ring.tx)
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+Link.RxFlowControl,                       config_parse_tristate,                 0,                             offsetof(LinkConfig, rx_flow_control)
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+Link.TxFlowControl,                       config_parse_tristate,                 0,                             offsetof(LinkConfig, tx_flow_control)
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+Link.AutoNegotiationFlowControl,          config_parse_tristate,                 0,                             offsetof(LinkConfig, autoneg_flow_control)
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+Link.GenericSegmentOffloadMaxBytes,       config_parse_iec_size,                 0,                             offsetof(LinkConfig, gso_max_size)
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+Link.GenericSegmentOffloadMaxSegments,    config_parse_uint32,                   0,                             offsetof(LinkConfig, gso_max_segments)
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+Link.RxCoalesceSec,                       config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.rx_coalesce_usecs)
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+Link.RxMaxCoalescedFrames,                config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.rx_max_coalesced_frames)
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+Link.RxCoalesceIrqSec,                    config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.rx_coalesce_usecs_irq)
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+Link.RxMaxCoalescedIrqFrames,             config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.rx_max_coalesced_frames_irq)
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+Link.TxCoalesceSec,                       config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.tx_coalesce_usecs)
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+Link.TxMaxCoalescedFrames,                config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.tx_max_coalesced_frames)
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+Link.TxCoalesceIrqSec,                    config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.tx_coalesce_usecs_irq)
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+Link.TxMaxCoalescedIrqFrames,             config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.tx_max_coalesced_frames_irq)
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+Link.StatisticsBlockCoalesceSec,          config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.stats_block_coalesce_usecs)
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+Link.UseAdaptiveRxCoalesce,               config_parse_tristate,                 0,                             offsetof(LinkConfig, coalesce.use_adaptive_rx_coalesce)
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+Link.UseAdaptiveTxCoalesce,               config_parse_tristate,                 0,                             offsetof(LinkConfig, coalesce.use_adaptive_tx_coalesce)
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+Link.CoalescePacketRateLow,               config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.pkt_rate_low)
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+Link.RxCoalesceLowSec,                    config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.rx_coalesce_usecs_low)
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+Link.RxMaxCoalescedLowFrames,             config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.rx_max_coalesced_frames_low)
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+Link.TxCoalesceLowSec,                    config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.tx_coalesce_usecs_low)
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+Link.TxMaxCoalescedLowFrames,             config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.tx_max_coalesced_frames_low)
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+Link.CoalescePacketRateHigh,              config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.pkt_rate_high)
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+Link.RxCoalesceHighSec,                   config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.rx_coalesce_usecs_high)
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+Link.RxMaxCoalescedHighFrames,            config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.rx_max_coalesced_frames_high)
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+Link.TxCoalesceHighSec,                   config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.tx_coalesce_usecs_high)
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+Link.TxMaxCoalescedHighFrames,            config_parse_coalesce_u32,             0,                             offsetof(LinkConfig, coalesce.tx_max_coalesced_frames_high)
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+Link.CoalescePacketRateSampleIntervalSec, config_parse_coalesce_sec,             0,                             offsetof(LinkConfig, coalesce.rate_sample_interval)
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diff --git a/src/udev/net/link-config.c b/src/udev/net/link-config.c
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index 8dfe23691b..9451bd8b66 100644
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--- a/src/udev/net/link-config.c
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+++ b/src/udev/net/link-config.c
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@@ -353,6 +353,10 @@ static int link_config_apply_ethtool_settings(int *ethtool_fd, const LinkConfig
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         if (r < 0)
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                 log_device_warning_errno(device, r, "Could not set flow control, ignoring: %m");
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+        r = ethtool_set_nic_coalesce_settings(ethtool_fd, name, &config->coalesce);
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+        if (r < 0)
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+                log_device_warning_errno(device, r, "Could not set coalesce settings, ignoring: %m");
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+
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         return 0;
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 }
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diff --git a/src/udev/net/link-config.h b/src/udev/net/link-config.h
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index b505c94f95..8a29a92822 100644
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--- a/src/udev/net/link-config.h
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+++ b/src/udev/net/link-config.h
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@@ -64,6 +64,7 @@ struct LinkConfig {
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         int rx_flow_control;
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         int tx_flow_control;
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         int autoneg_flow_control;
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+        netdev_coalesce_param coalesce;
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         LIST_FIELDS(LinkConfig, links);
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 };
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diff --git a/test/fuzz/fuzz-link-parser/directives.link b/test/fuzz/fuzz-link-parser/directives.link
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index 112a81930f..5f232ce698 100644
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--- a/test/fuzz/fuzz-link-parser/directives.link
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+++ b/test/fuzz/fuzz-link-parser/directives.link
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@@ -51,3 +51,25 @@ TxFlowControl=
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 AutoNegotiationFlowControl=
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 GenericSegmentOffloadMaxBytes=
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 GenericSegmentOffloadMaxSegments=
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+RxCoalesceSec=
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+RxMaxCoalescedFrames=
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+RxCoalesceIrqSec=
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+RxMaxCoalescedIrqFrames=
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+TxCoalesceSec=
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+TxMaxCoalescedFrames=
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+TxCoalesceIrqSec=
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+TxMaxCoalescedIrqFrames=
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+StatisticsBlockCoalesceSec=
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+UseAdaptiveRxCoalesce=
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+UseAdaptiveTxCoalesce=
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+CoalescePacketRateLow=
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+RxCoalesceLowSec=
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+RxMaxCoalescedLowFrames=
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+TxCoalesceLowSec=
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+TxMaxCoalescedLowFrames=
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+CoalescePacketRateHigh=
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+RxCoalesceHighSec=
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+RxMaxCoalescedHighFrames=
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+TxCoalesceHighSec=
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+TxMaxCoalescedHighFrames=
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+CoalescePacketRateSampleIntervalSec=
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-- 
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2.31.1
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