diff --git a/sysfs/class_infiniband.go b/sysfs/class_infiniband.go
index 7892c69a..e8e0ee46 100644
--- a/sysfs/class_infiniband.go
+++ b/sysfs/class_infiniband.go
@@ -107,6 +107,7 @@ type InfiniBandHwCounters struct {
 // /sys/class/infiniband/<Name>/ports/<Port>
 // for a single port of one InfiniBand device.
 type InfiniBandPort struct {
+	LinkLayer   string
 	Name        string
 	Port        uint
 	State       string // String representation from /sys/class/infiniband/<Name>/ports/<Port>/state
@@ -248,6 +249,13 @@ func (fs FS) parseInfiniBandPort(name string, port string) (*InfiniBandPort, err
 	ibp := InfiniBandPort{Name: name, Port: uint(portNumber)}
 
 	portPath := fs.sys.Path(infinibandClassPath, name, "ports", port)
+
+	linkLayer, err := os.ReadFile(filepath.Join(portPath, "link_layer"))
+	if err != nil {
+		return nil, err
+	}
+	ibp.LinkLayer = strings.TrimSpace(string(linkLayer))
+
 	content, err := os.ReadFile(filepath.Join(portPath, "state"))
 	if err != nil {
 		return nil, err
diff --git a/sysfs/class_infiniband_test.go b/sysfs/class_infiniband_test.go
index 461e2805..2a9ed091 100644
--- a/sysfs/class_infiniband_test.go
+++ b/sysfs/class_infiniband_test.go
@@ -174,6 +174,7 @@ func TestInfiniBandClass(t *testing.T) {
 			HCAType:         "",
 			Ports: map[uint]InfiniBandPort{
 				1: {
+					LinkLayer:   "InfiniBand",
 					Name:        "hfi1_0",
 					Port:        1,
 					State:       "ACTIVE",
@@ -210,6 +211,7 @@ func TestInfiniBandClass(t *testing.T) {
 			HCAType:         "MT4099",
 			Ports: map[uint]InfiniBandPort{
 				1: {
+					LinkLayer:   "InfiniBand",
 					Name:        "mlx4_0",
 					Port:        1,
 					State:       "ACTIVE",
@@ -238,6 +240,7 @@ func TestInfiniBandClass(t *testing.T) {
 					},
 				},
 				2: {
+					LinkLayer:   "InfiniBand",
 					Name:        "mlx4_0",
 					Port:        2,
 					State:       "ACTIVE",
@@ -274,6 +277,7 @@ func TestInfiniBandClass(t *testing.T) {
 			HCAType:         "MT4118",
 			Ports: map[uint]InfiniBandPort{
 				1: {
+					LinkLayer:   "InfiniBand",
 					Name:        "mlx5_0",
 					Port:        1,
 					State:       "ACTIVE",
diff --git a/testdata/fixtures.ttar b/testdata/fixtures.ttar
index 8f6cd477..bbc3e8ef 100644
--- a/testdata/fixtures.ttar
+++ b/testdata/fixtures.ttar
@@ -5748,6 +5748,11 @@ Lines: 1
 0
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/sys/class/infiniband/hfi1_0/ports/1/link_layer
+Lines: 1
+InfiniBand
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/sys/class/infiniband/hfi1_0/ports/1/phys_state
 Lines: 1
 5: LinkUp
@@ -5875,6 +5880,11 @@ Lines: 1
 0
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/sys/class/infiniband/mlx4_0/ports/1/link_layer
+Lines: 1
+InfiniBand
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/sys/class/infiniband/mlx4_0/ports/1/phys_state
 Lines: 1
 5: LinkUp
@@ -5979,6 +5989,12 @@ Mode: 644
 Path: fixtures/sys/class/infiniband/mlx4_0/ports/2/counters/symbol_error
 Lines: 1
 0
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/sys/class/infiniband/mlx4_0/ports/2/link_layer
+Lines: 2
+InfiniBand
+
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/sys/class/infiniband/mlx4_0/ports/2/phys_state
@@ -6256,6 +6272,11 @@ Lines: 1
 742114
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/sys/class/infiniband/mlx5_0/ports/1/link_layer
+Lines: 1
+InfiniBand
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/sys/class/infiniband/mlx5_0/ports/1/phys_state
 Lines: 1
 4: ACTIVE