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Index: sys/dev/e1000/if_em.h
===================================================================
--- sys/dev/e1000/if_em.h
+++ sys/dev/e1000/if_em.h
@@ -269,7 +269,7 @@
#define HW_DEBUGOUT1(S, A) if (DEBUG_HW) printf(S "\n", A)
#define HW_DEBUGOUT2(S, A, B) if (DEBUG_HW) printf(S "\n", A, B)
-#define EM_MAX_SCATTER 64
+#define EM_MAX_SCATTER 40
#define EM_VFTA_SIZE 128
#define EM_TSO_SIZE (65535 + sizeof(struct ether_vlan_header))
#define EM_TSO_SEG_SIZE 4096 /* Max dma segment size */
Index: sys/dev/e1000/if_em.c
===================================================================
--- sys/dev/e1000/if_em.c
+++ sys/dev/e1000/if_em.c
@@ -3193,9 +3193,11 @@
if_setflags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
if_setioctlfn(ifp, em_ioctl);
if_setgetcounterfn(ifp, em_get_counter);
+
/* TSO parameters */
ifp->if_hw_tsomax = IP_MAXPACKET;
- ifp->if_hw_tsomaxsegcount = EM_MAX_SCATTER;
+ /* Take m_pullup(9)'s in em_xmit() w/ TSO into acount. */
+ ifp->if_hw_tsomaxsegcount = EM_MAX_SCATTER - 5;
ifp->if_hw_tsomaxsegsize = EM_TSO_SEG_SIZE;
#ifdef EM_MULTIQUEUE
Index: sys/dev/e1000/if_igb.h
===================================================================
--- sys/dev/e1000/if_igb.h
+++ sys/dev/e1000/if_igb.h
@@ -278,7 +278,7 @@
#define HW_DEBUGOUT1(S, A) if (DEBUG_HW) printf(S "\n", A)
#define HW_DEBUGOUT2(S, A, B) if (DEBUG_HW) printf(S "\n", A, B)
-#define IGB_MAX_SCATTER 64
+#define IGB_MAX_SCATTER 40
#define IGB_VFTA_SIZE 128
#define IGB_BR_SIZE 4096 /* ring buf size */
#define IGB_TSO_SIZE (65535 + sizeof(struct ether_vlan_header))
Index: sys/dev/e1000/if_igb.c
===================================================================
--- sys/dev/e1000/if_igb.c
+++ sys/dev/e1000/if_igb.c
@@ -3139,6 +3139,12 @@
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_ioctl = igb_ioctl;
ifp->if_get_counter = igb_get_counter;
+
+ /* TSO parameters */
+ ifp->if_hw_tsomax = IP_MAXPACKET;
+ ifp->if_hw_tsomaxsegcount = IGB_MAX_SCATTER;
+ ifp->if_hw_tsomaxsegsize = IGB_TSO_SEG_SIZE;
+
#ifndef IGB_LEGACY_TX
ifp->if_transmit = igb_mq_start;
ifp->if_qflush = igb_qflush;
Index: sys/dev/e1000/if_lem.h
===================================================================
--- sys/dev/e1000/if_lem.h
+++ sys/dev/e1000/if_lem.h
@@ -236,10 +236,8 @@
#define HW_DEBUGOUT1(S, A) if (DEBUG_HW) printf(S "\n", A)
#define HW_DEBUGOUT2(S, A, B) if (DEBUG_HW) printf(S "\n", A, B)
-#define EM_MAX_SCATTER 64
+#define EM_MAX_SCATTER 40
#define EM_VFTA_SIZE 128
-#define EM_TSO_SIZE (65535 + sizeof(struct ether_vlan_header))
-#define EM_TSO_SEG_SIZE 4096 /* Max dma segment size */
#define EM_MSIX_MASK 0x01F00000 /* For 82574 use */
#define ETH_ZLEN 60
#define ETH_ADDR_LEN 6

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