Index: head/share/man/man4/alc.4
===================================================================
--- head/share/man/man4/alc.4
+++ head/share/man/man4/alc.4
@@ -124,6 +124,8 @@
 Killer E2200 Gigabit Ethernet controller
 .It
 Killer E2400 Gigabit Ethernet controller
+.It
+Killer E2500 Gigabit Ethernet controller
 .El
 .Sh LOADER TUNABLES
 Tunables can be set at the
Index: head/sys/dev/alc/if_alc.c
===================================================================
--- head/sys/dev/alc/if_alc.c
+++ head/sys/dev/alc/if_alc.c
@@ -123,6 +123,8 @@
 		"Killer E2200 Gigabit Ethernet" },
 	{ VENDORID_ATHEROS, DEVICEID_ATHEROS_E2400, 9 * 1024,
 		"Killer E2400 Gigabit Ethernet" },
+	{ VENDORID_ATHEROS, DEVICEID_ATHEROS_E2500, 9 * 1024,
+		"Killer E2500 Gigabit Ethernet" },
 	{ 0, 0, 0, NULL}
 };
 
@@ -1083,6 +1085,7 @@
 	case DEVICEID_ATHEROS_AR8161:
 	case DEVICEID_ATHEROS_E2200:
 	case DEVICEID_ATHEROS_E2400:
+	case DEVICEID_ATHEROS_E2500:
 	case DEVICEID_ATHEROS_AR8162:
 	case DEVICEID_ATHEROS_AR8171:
 	case DEVICEID_ATHEROS_AR8172:
@@ -1402,6 +1405,7 @@
 	switch (sc->alc_ident->deviceid) {
 	case DEVICEID_ATHEROS_E2200:
 	case DEVICEID_ATHEROS_E2400:
+	case DEVICEID_ATHEROS_E2500:
 		sc->alc_flags |= ALC_FLAG_E2X00;
 		/* FALLTHROUGH */
 	case DEVICEID_ATHEROS_AR8161:
@@ -1480,7 +1484,8 @@
 		if (alc_dma_burst[sc->alc_dma_wr_burst] > 1024)
 			sc->alc_dma_wr_burst = 3;
 		/*
-		 * Force maximum payload size to 128 bytes for E2200/E2400.
+		 * Force maximum payload size to 128 bytes for
+		 * E2200/E2400/E2500.
 		 * Otherwise it triggers DMA write error.
 		 */
 		if ((sc->alc_flags & ALC_FLAG_E2X00) != 0)
Index: head/sys/dev/alc/if_alcreg.h
===================================================================
--- head/sys/dev/alc/if_alcreg.h
+++ head/sys/dev/alc/if_alcreg.h
@@ -50,6 +50,7 @@
 #define	DEVICEID_ATHEROS_AR8172		0x10A0
 #define	DEVICEID_ATHEROS_E2200		0xE091
 #define	DEVICEID_ATHEROS_E2400		0xE0A1
+#define	DEVICEID_ATHEROS_E2500		0xE0B1
 
 #define	ATHEROS_AR8152_B_V10		0xC0
 #define	ATHEROS_AR8152_B_V11		0xC1
Index: head/sys/dev/pci/pci.c
===================================================================
--- head/sys/dev/pci/pci.c
+++ head/sys/dev/pci/pci.c
@@ -281,13 +281,14 @@
 	{ 0x43851002, PCI_QUIRK_UNMAP_REG,	0x14,	0 },
 
 	/*
-	 * Atheros AR8161/AR8162/E2200/E2400 Ethernet controllers have a
-	 * bug that MSI interrupt does not assert if PCIM_CMD_INTxDIS bit
+	 * Atheros AR8161/AR8162/E2200/E2400/E2500 Ethernet controllers have
+	 * a bug that MSI interrupt does not assert if PCIM_CMD_INTxDIS bit
 	 * of the command register is set.
 	 */
 	{ 0x10911969, PCI_QUIRK_MSI_INTX_BUG,	0,	0 },
 	{ 0xE0911969, PCI_QUIRK_MSI_INTX_BUG,	0,	0 },
 	{ 0xE0A11969, PCI_QUIRK_MSI_INTX_BUG,	0,	0 },
+	{ 0xE0B11969, PCI_QUIRK_MSI_INTX_BUG,	0,	0 },
 	{ 0x10901969, PCI_QUIRK_MSI_INTX_BUG,	0,	0 },
 
 	/*