diff --git a/man/systemd.network.xml b/man/systemd.network.xml
index 13eb06fdca..b82efd4394 100644
--- a/man/systemd.network.xml
+++ b/man/systemd.network.xml
@@ -3491,6 +3491,14 @@ Token=prefixstable:2002:da8:1::
+
+ MPUBytes=
+
+ Rounds each packet (including overhead) up to the specified bytes. Takes an integer in
+ the range 1…256. Defaults to unset and kernel's default is used.
+
+
+
CompensationMode=
diff --git a/src/network/networkd-network-gperf.gperf b/src/network/networkd-network-gperf.gperf
index 1fe4b72b5f..1c09f300bd 100644
--- a/src/network/networkd-network-gperf.gperf
+++ b/src/network/networkd-network-gperf.gperf
@@ -388,6 +388,7 @@ CAKE.Handle, config_parse_qdisc_handle,
CAKE.Bandwidth, config_parse_cake_bandwidth, QDISC_KIND_CAKE, 0
CAKE.AutoRateIngress, config_parse_cake_tristate, QDISC_KIND_CAKE, 0
CAKE.OverheadBytes, config_parse_cake_overhead, QDISC_KIND_CAKE, 0
+CAKE.MPUBytes, config_parse_cake_mpu, QDISC_KIND_CAKE, 0
CAKE.CompensationMode, config_parse_cake_compensation_mode, QDISC_KIND_CAKE, 0
CAKE.FlowIsolationMode, config_parse_cake_flow_isolation_mode, QDISC_KIND_CAKE, 0
CAKE.NAT, config_parse_cake_tristate, QDISC_KIND_CAKE, 0
diff --git a/src/network/tc/cake.c b/src/network/tc/cake.c
index 27395918ea..7641574fd8 100644
--- a/src/network/tc/cake.c
+++ b/src/network/tc/cake.c
@@ -59,6 +59,12 @@ static int cake_fill_message(Link *link, QDisc *qdisc, sd_netlink_message *req)
return log_link_error_errno(link, r, "Could not append TCA_CAKE_OVERHEAD attribute: %m");
}
+ if (c->mpu > 0) {
+ r = sd_netlink_message_append_u32(req, TCA_CAKE_MPU, c->mpu);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not append TCA_CAKE_MPU attribute: %m");
+ }
+
if (c->compensation_mode >= 0) {
r = sd_netlink_message_append_u32(req, TCA_CAKE_ATM, c->compensation_mode);
if (r < 0)
@@ -199,6 +205,65 @@ int config_parse_cake_overhead(
return 0;
}
+int config_parse_cake_mpu(
+ 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) {
+
+ _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
+ CommonApplicationsKeptEnhanced *c;
+ Network *network = data;
+ uint32_t v;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = qdisc_new_static(QDISC_KIND_CAKE, network, filename, section_line, &qdisc);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "More than one kind of queueing discipline, ignoring assignment: %m");
+ return 0;
+ }
+
+ c = CAKE(qdisc);
+
+ if (isempty(rvalue)) {
+ c->mpu = 0;
+ TAKE_PTR(qdisc);
+ return 0;
+ }
+
+ r = safe_atou32(rvalue, &v);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse '%s=', ignoring assignment: %s",
+ lvalue, rvalue);
+ return 0;
+ }
+ if (v <= 0 || v > 256) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "Invalid '%s=', ignoring assignment: %s",
+ lvalue, rvalue);
+ return 0;
+ }
+
+ c->mpu = v;
+ TAKE_PTR(qdisc);
+ return 0;
+}
+
int config_parse_cake_tristate(
const char *unit,
const char *filename,
diff --git a/src/network/tc/cake.h b/src/network/tc/cake.h
index 1be8cacbe9..c8defb505e 100644
--- a/src/network/tc/cake.h
+++ b/src/network/tc/cake.h
@@ -38,6 +38,7 @@ typedef struct CommonApplicationsKeptEnhanced {
/* Overhead compensation parameters */
bool overhead_set;
int overhead;
+ uint32_t mpu;
CakeCompensationMode compensation_mode;
/* Flow isolation parameters */
@@ -51,6 +52,7 @@ extern const QDiscVTable cake_vtable;
CONFIG_PARSER_PROTOTYPE(config_parse_cake_bandwidth);
CONFIG_PARSER_PROTOTYPE(config_parse_cake_overhead);
+CONFIG_PARSER_PROTOTYPE(config_parse_cake_mpu);
CONFIG_PARSER_PROTOTYPE(config_parse_cake_tristate);
CONFIG_PARSER_PROTOTYPE(config_parse_cake_compensation_mode);
CONFIG_PARSER_PROTOTYPE(config_parse_cake_flow_isolation_mode);
diff --git a/test/fuzz/fuzz-network-parser/directives.network b/test/fuzz/fuzz-network-parser/directives.network
index 5d0d0968e7..de6d460eb1 100644
--- a/test/fuzz/fuzz-network-parser/directives.network
+++ b/test/fuzz/fuzz-network-parser/directives.network
@@ -470,6 +470,7 @@ Handle=
Bandwidth=
AutoRateIngress=
OverheadBytes=
+MPUBytes=
CompensationMode=
FlowIsolationMode=
NAT=