Index: head/sys/dev/ixl/if_iavf.c
===================================================================
--- head/sys/dev/ixl/if_iavf.c
+++ head/sys/dev/ixl/if_iavf.c
@@ -260,7 +260,7 @@
 	.isc_vendor_info = iavf_vendor_info_array,
 	.isc_driver_version = IAVF_DRIVER_VERSION_STRING,
 	.isc_driver = &iavf_if_driver,
-	.isc_flags = IFLIB_NEED_SCRATCH | IFLIB_NEED_ZERO_CSUM | IFLIB_IS_VF,
+	.isc_flags = IFLIB_NEED_SCRATCH | IFLIB_NEED_ZERO_CSUM | IFLIB_TSO_INIT_IP | IFLIB_IS_VF,
 
 	.isc_nrxd_min = {IXL_MIN_RING},
 	.isc_ntxd_min = {IXL_MIN_RING},
Index: head/sys/dev/ixl/if_ixl.c
===================================================================
--- head/sys/dev/ixl/if_ixl.c
+++ head/sys/dev/ixl/if_ixl.c
@@ -323,7 +323,7 @@
 	.isc_vendor_info = ixl_vendor_info_array,
 	.isc_driver_version = IXL_DRIVER_VERSION_STRING,
 	.isc_driver = &ixl_if_driver,
-	.isc_flags = IFLIB_NEED_SCRATCH | IFLIB_NEED_ZERO_CSUM | IFLIB_ADMIN_ALWAYS_RUN,
+	.isc_flags = IFLIB_NEED_SCRATCH | IFLIB_NEED_ZERO_CSUM | IFLIB_TSO_INIT_IP | IFLIB_ADMIN_ALWAYS_RUN,
 
 	.isc_nrxd_min = {IXL_MIN_RING},
 	.isc_ntxd_min = {IXL_MIN_RING},
Index: head/sys/dev/ixl/ixl.h
===================================================================
--- head/sys/dev/ixl/ixl.h
+++ head/sys/dev/ixl/ixl.h
@@ -258,6 +258,8 @@
 	(CSUM_IP_UDP|CSUM_IP6_UDP)
 #define IXL_CSUM_SCTP \
 	(CSUM_IP_SCTP|CSUM_IP6_SCTP)
+#define IXL_CSUM_IPV4 \
+	(CSUM_IP|CSUM_IP_TSO)
 
 /* Pre-11 counter(9) compatibility */
 #if __FreeBSD_version >= 1100036
Index: head/sys/dev/ixl/ixl_txrx.c
===================================================================
--- head/sys/dev/ixl/ixl_txrx.c
+++ head/sys/dev/ixl/ixl_txrx.c
@@ -225,7 +225,7 @@
 	switch (pi->ipi_etype) {
 #ifdef INET
 		case ETHERTYPE_IP:
-			if (pi->ipi_csum_flags & CSUM_IP)
+			if (pi->ipi_csum_flags & IXL_CSUM_IPV4)
 				*cmd |= I40E_TX_DESC_CMD_IIPT_IPV4_CSUM;
 			else
 				*cmd |= I40E_TX_DESC_CMD_IIPT_IPV4;