Hi,

Please find attached an updated TSO patch based on comments from Andrew, Rick and John-Mark Gurney. Review is appreciated.

--HPS
=== sys/dev/oce/oce_if.c
==================================================================
--- sys/dev/oce/oce_if.c	(revision 271555)
+++ sys/dev/oce/oce_if.c	(local)
@@ -1731,7 +1731,9 @@
 	sc->ifp->if_baudrate = IF_Gbps(10);
 
 #if __FreeBSD_version >= 1000000
-	sc->ifp->if_hw_tsomax = OCE_MAX_TSO_SIZE;
+	sc->ifp->if_hw_tsomax = 65536 - (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN);
+	sc->ifp->if_hw_tsomaxsegcount = OCE_MAX_TX_ELEMENTS;
+	sc->ifp->if_hw_tsomaxsegsize = 4096;
 #endif
 
 	ether_ifattach(sc->ifp, sc->macaddr.mac_addr);
=== sys/dev/oce/oce_if.h
==================================================================
--- sys/dev/oce/oce_if.h	(revision 271555)
+++ sys/dev/oce/oce_if.h	(local)
@@ -152,7 +152,6 @@
 #define OCE_MAX_TX_ELEMENTS		29
 #define OCE_MAX_TX_DESC			1024
 #define OCE_MAX_TX_SIZE			65535
-#define OCE_MAX_TSO_SIZE		(65535 - ETHER_HDR_LEN)
 #define OCE_MAX_RX_SIZE			4096
 #define OCE_MAX_RQ_POSTS		255
 #define OCE_DEFAULT_PROMISCUOUS		0
=== sys/dev/vmware/vmxnet3/if_vmx.c
==================================================================
--- sys/dev/vmware/vmxnet3/if_vmx.c	(revision 271555)
+++ sys/dev/vmware/vmxnet3/if_vmx.c	(local)
@@ -1722,7 +1722,9 @@
 	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 	ifp->if_init = vmxnet3_init;
 	ifp->if_ioctl = vmxnet3_ioctl;
-	ifp->if_hw_tsomax = VMXNET3_TSO_MAXSIZE;
+	ifp->if_hw_tsomax = 65536 - (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN);
+	ifp->if_hw_tsomaxsegcount = VMXNET3_TX_MAXSEGS;
+	ifp->if_hw_tsomaxsegsize = VMXNET3_TX_MAXSEGSIZE;
 
 #ifdef VMXNET3_LEGACY_TX
 	ifp->if_start = vmxnet3_start;
=== sys/dev/vmware/vmxnet3/if_vmxvar.h
==================================================================
--- sys/dev/vmware/vmxnet3/if_vmxvar.h	(revision 271555)
+++ sys/dev/vmware/vmxnet3/if_vmxvar.h	(local)
@@ -277,8 +277,6 @@
  */
 #define VMXNET3_TX_MAXSEGS		32
 #define VMXNET3_TX_MAXSIZE		(VMXNET3_TX_MAXSEGS * MCLBYTES)
-#define VMXNET3_TSO_MAXSIZE \
-    (VMXNET3_TX_MAXSIZE - sizeof(struct ether_vlan_header))
 
 /*
  * Maximum support Tx segments size. The length field in the
=== sys/dev/xen/netfront/netfront.c
==================================================================
--- sys/dev/xen/netfront/netfront.c	(revision 271555)
+++ sys/dev/xen/netfront/netfront.c	(local)
@@ -134,7 +134,6 @@
  * to mirror the Linux MAX_SKB_FRAGS constant.
  */
 #define	MAX_TX_REQ_FRAGS (65536 / PAGE_SIZE + 2)
-#define	NF_TSO_MAXBURST ((IP_MAXPACKET / PAGE_SIZE) * MCLBYTES)
 
 #define RX_COPY_THRESHOLD 256
 
@@ -2102,7 +2101,9 @@
 	
     	ifp->if_hwassist = XN_CSUM_FEATURES;
     	ifp->if_capabilities = IFCAP_HWCSUM;
-	ifp->if_hw_tsomax = NF_TSO_MAXBURST;
+	ifp->if_hw_tsomax = 65536 - (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN);
+	ifp->if_hw_tsomaxsegcount = MAX_TX_REQ_FRAGS;
+	ifp->if_hw_tsomaxsegsize = PAGE_SIZE;
 	
     	ether_ifattach(ifp, np->mac);
     	callout_init(&np->xn_stat_ch, CALLOUT_MPSAFE);
=== sys/kern/uipc_sockbuf.c
==================================================================
--- sys/kern/uipc_sockbuf.c	(revision 271555)
+++ sys/kern/uipc_sockbuf.c	(local)
@@ -1015,6 +1015,37 @@
 }
 
 /*
+ * Return the first mbuf and the mbuf data offset for the provided
+ * send offset without changing the "sb_sndptroff" field.
+ */
+struct mbuf *
+sbsndmbuf(struct sockbuf *sb, u_int off, u_int *moff)
+{
+	struct mbuf *m;
+
+	KASSERT(sb->sb_mb != NULL, ("%s: sb_mb is NULL", __func__));
+
+	/*
+	 * If the "off" is below the stored offset, which happens on
+	 * retransmits, just use "sb_mb":
+	 */
+	if (sb->sb_sndptr == NULL || sb->sb_sndptroff > off) {
+		m = sb->sb_mb;
+	} else {
+		m = sb->sb_sndptr;
+		off -= sb->sb_sndptroff;
+	}
+	while (off > 0 && m != NULL) {
+		if (off < m->m_len)
+			break;
+		off -= m->m_len;
+		m = m->m_next;
+	}
+	*moff = off;
+	return (m);
+}
+
+/*
  * Drop a record off the front of a sockbuf and move the next record to the
  * front.
  */
=== sys/net/if.c
==================================================================
--- sys/net/if.c	(revision 271555)
+++ sys/net/if.c	(local)
@@ -584,6 +584,57 @@
 	if_attach_internal(ifp, 0);
 }
 
+/*
+ * Compute the least common TSO limit.
+ */
+void
+if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax)
+{
+	/*
+	 * 1) If there is no limit currently, take the limit from
+	 * the network adapter.
+	 *
+	 * 2) If the network adapter has a limit below the current
+	 * limit, apply it.
+	 */
+	if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 &&
+	    ifp->if_hw_tsomax < pmax->tsomaxbytes)) {
+		pmax->tsomaxbytes = ifp->if_hw_tsomax;
+	}
+	if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 &&
+	    ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) {
+		pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
+	}
+	if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 &&
+	    ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) {
+		pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
+	}
+}
+
+/*
+ * Update TSO limit of a network adapter.
+ *
+ * Returns zero if no change. Else non-zero.
+ */
+int
+if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax)
+{
+	int retval = 0;
+	if (ifp->if_hw_tsomax != pmax->tsomaxbytes) {
+		ifp->if_hw_tsomax = pmax->tsomaxbytes;
+		retval++;
+	}
+	if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) {
+		ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize;
+		retval++;
+	}
+	if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) {
+		ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount;
+		retval++;
+	}
+	return (retval);
+}
+
 static void
 if_attach_internal(struct ifnet *ifp, int vmove)
 {
@@ -659,13 +710,36 @@
 		ifp->if_broadcastaddr = NULL;
 
 #if defined(INET) || defined(INET6)
-		/* Initialize to max value. */
-		if (ifp->if_hw_tsomax == 0)
-			ifp->if_hw_tsomax = min(IP_MAXPACKET, 32 * MCLBYTES -
+		/* Use defaults for TSO, if nothing is set */
+		if (ifp->if_hw_tsomax == 0 &&
+		    ifp->if_hw_tsomaxsegcount == 0 &&
+		    ifp->if_hw_tsomaxsegsize == 0) {
+			/*
+			 * The TSO defaults needs to be such that an
+			 * NFS mbuf list of 35 mbufs totalling just
+			 * below 64K works and that a chain of mbufs
+			 * can be defragged into at most 32 segments:
+			 */
+			ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) -
 			    (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN));
-		KASSERT(ifp->if_hw_tsomax <= IP_MAXPACKET &&
-		    ifp->if_hw_tsomax >= IP_MAXPACKET / 8,
-		    ("%s: tsomax outside of range", __func__));
+			ifp->if_hw_tsomaxsegcount = 35;
+			ifp->if_hw_tsomaxsegsize = 2048;	/* 2K */
+
+			/* XXX some drivers set IFCAP_TSO after ethernet attach */
+			if (ifp->if_capabilities & IFCAP_TSO) {
+				if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n",
+				    ifp->if_hw_tsomax,
+				    ifp->if_hw_tsomaxsegcount,
+				    ifp->if_hw_tsomaxsegsize);
+			}
+		}
+		/*
+		 * If the "if_hw_tsomax" limit is set, check if it is
+		 * too small:
+		 */
+		KASSERT(ifp->if_hw_tsomax == 0 ||
+		    ifp->if_hw_tsomax >= (IP_MAXPACKET / 8),
+		    ("%s: if_hw_tsomax is outside of range", __func__));
 #endif
 	}
 #ifdef VIMAGE
=== sys/net/if_lagg.c
==================================================================
--- sys/net/if_lagg.c	(revision 271555)
+++ sys/net/if_lagg.c	(local)
@@ -445,23 +445,18 @@
 	struct lagg_port *lp;
 	int cap = ~0, ena = ~0;
 	u_long hwa = ~0UL;
-#if defined(INET) || defined(INET6)
-	u_int hw_tsomax = IP_MAXPACKET;	/* Initialize to the maximum value. */
-#else
-	u_int hw_tsomax = ~0;	/* if_hw_tsomax is only for INET/INET6, but.. */
-#endif
+	struct ifnet_hw_tsomax hw_tsomax;
 
 	LAGG_WLOCK_ASSERT(sc);
 
+	memset(&hw_tsomax, 0, sizeof(hw_tsomax));
+
 	/* Get capabilities from the lagg ports */
 	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
 		cap &= lp->lp_ifp->if_capabilities;
 		ena &= lp->lp_ifp->if_capenable;
 		hwa &= lp->lp_ifp->if_hwassist;
-		/* Set to the minimum value of the lagg ports. */
-		if (lp->lp_ifp->if_hw_tsomax < hw_tsomax &&
-		    lp->lp_ifp->if_hw_tsomax > 0)
-			hw_tsomax = lp->lp_ifp->if_hw_tsomax;
+		if_hw_tsomax_common(lp->lp_ifp, &hw_tsomax);
 	}
 	cap = (cap == ~0 ? 0 : cap);
 	ena = (ena == ~0 ? 0 : ena);
@@ -470,11 +465,10 @@
 	if (sc->sc_ifp->if_capabilities != cap ||
 	    sc->sc_ifp->if_capenable != ena ||
 	    sc->sc_ifp->if_hwassist != hwa ||
-	    sc->sc_ifp->if_hw_tsomax != hw_tsomax) {
+	    if_hw_tsomax_update(sc->sc_ifp, &hw_tsomax) != 0) {
 		sc->sc_ifp->if_capabilities = cap;
 		sc->sc_ifp->if_capenable = ena;
 		sc->sc_ifp->if_hwassist = hwa;
-		sc->sc_ifp->if_hw_tsomax = hw_tsomax;
 		getmicrotime(&sc->sc_ifp->if_lastchange);
 
 		if (sc->sc_ifflags & IFF_DEBUG)
=== sys/net/if_var.h
==================================================================
--- sys/net/if_var.h	(revision 271555)
+++ sys/net/if_var.h	(local)
@@ -119,6 +119,12 @@
 typedef int (*if_transmit_fn_t)(if_t, struct mbuf *);
 typedef	uint64_t (*if_get_counter_t)(if_t, ifnet_counter);
 
+struct ifnet_hw_tsomax {
+	u_int	tsomaxbytes;	/* TSO total burst length limit in bytes */
+	u_int	tsomaxsegcount;	/* TSO maximum segment count */
+	u_int	tsomaxsegsize;	/* TSO maximum segment size in bytes */
+};
+
 /*
  * Structure defining a network interface.
  *
@@ -222,10 +228,11 @@
 	if_get_counter_t if_get_counter; /* get counter values */
 
 	/* Stuff that's only temporary and doesn't belong here. */
-	u_int	if_hw_tsomax;		/* tso burst length limit, the minimum
-					 * is (IP_MAXPACKET / 8).
-					 * XXXAO: Have to find a better place
-					 * for it eventually. */
+	u_int	if_hw_tsomax;		/* TSO total burst length
+					 * limit in bytes. A value of
+					 * zero means no limit. Have
+					 * to find a better place for
+					 * it eventually. */
 	/*
 	 * Old, racy and expensive statistics, should not be used in
 	 * new drivers.
@@ -243,6 +250,10 @@
 	uint64_t	if_oqdrops;	/* dropped on output */
 	uint64_t	if_noproto;	/* destined for unsupported protocol */
 
+	/* TSO fields for segment limits. If a field is zero below, there is no limit. */
+	u_int		if_hw_tsomaxsegcount;	/* TSO maximum segment count */
+	u_int		if_hw_tsomaxsegsize;	/* TSO maximum segment size in bytes */
+
 	/*
 	 * Spare fields to be added before branching a stable branch, so
 	 * that structure can be enhanced without changing the kernel
@@ -615,5 +626,9 @@
 int drbr_needs_enqueue_drv(if_t ifp, struct buf_ring *br);
 int drbr_enqueue_drv(if_t ifp, struct buf_ring *br, struct mbuf *m);
 
+/* TSO */
+void if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *);
+int if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *);
+
 #endif /* _KERNEL */
 #endif /* !_NET_IF_VAR_H_ */
=== sys/net/if_vlan.c
==================================================================
--- sys/net/if_vlan.c	(revision 271555)
+++ sys/net/if_vlan.c	(local)
@@ -1531,6 +1531,7 @@
 {
 	struct ifnet *p = PARENT(ifv);
 	struct ifnet *ifp = ifv->ifv_ifp;
+	struct ifnet_hw_tsomax hw_tsomax;
 
 	TRUNK_LOCK_ASSERT(TRUNK(ifv));
 
@@ -1557,8 +1558,9 @@
 	 * propagate the hardware-assisted flag. TSO on VLANs
 	 * does not necessarily require hardware VLAN tagging.
 	 */
-	if (p->if_hw_tsomax > 0)
-		ifp->if_hw_tsomax = p->if_hw_tsomax;
+	memset(&hw_tsomax, 0, sizeof(hw_tsomax));
+	if_hw_tsomax_common(p, &hw_tsomax);
+	if_hw_tsomax_update(ifp, &hw_tsomax);
 	if (p->if_capabilities & IFCAP_VLAN_HWTSO)
 		ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO;
 	if (p->if_capenable & IFCAP_VLAN_HWTSO) {
=== sys/netinet/tcp_input.c
==================================================================
--- sys/netinet/tcp_input.c	(revision 271555)
+++ sys/netinet/tcp_input.c	(local)
@@ -3618,6 +3618,8 @@
 	if (cap.ifcap & CSUM_TSO) {
 		tp->t_flags |= TF_TSO;
 		tp->t_tsomax = cap.tsomax;
+		tp->t_tsomaxsegcount = cap.tsomaxsegcount;
+		tp->t_tsomaxsegsize = cap.tsomaxsegsize;
 	}
 }
 
=== sys/netinet/tcp_output.c
==================================================================
--- sys/netinet/tcp_output.c	(revision 271555)
+++ sys/netinet/tcp_output.c	(local)
@@ -767,28 +767,113 @@
 		flags &= ~TH_FIN;
 
 		if (tso) {
+			u_int if_hw_tsomax;
+			u_int if_hw_tsomaxsegcount;
+			u_int if_hw_tsomaxsegsize;
+			struct mbuf *mb;
+			u_int moff;
+			int max_len;
+
+			/* extract TSO information */
+			if_hw_tsomax = tp->t_tsomax;
+			if_hw_tsomaxsegcount = tp->t_tsomaxsegcount;
+			if_hw_tsomaxsegsize = tp->t_tsomaxsegsize;
+
+			/*
+			 * Limit a TSO burst to prevent it from
+			 * overflowing or exceeding the maximum length
+			 * allowed by the network interface:
+			 */
 			KASSERT(ipoptlen == 0,
 			    ("%s: TSO can't do IP options", __func__));
 
 			/*
-			 * Limit a burst to t_tsomax minus IP,
-			 * TCP and options length to keep ip->ip_len
-			 * from overflowing or exceeding the maximum
-			 * length allowed by the network interface.
+			 * Check if we should limit by maximum payload
+			 * length:
 			 */
-			if (len > tp->t_tsomax - hdrlen) {
-				len = tp->t_tsomax - hdrlen;
-				sendalot = 1;
+			if (if_hw_tsomax != 0) {
+				/* compute maximum TSO length */
+				max_len = (if_hw_tsomax - hdrlen);
+				if (max_len <= 0) {
+					len = 0;
+				} else if (len > (u_int)max_len) {
+					sendalot = 1;
+					len = (u_int)max_len;
+				}
 			}
 
 			/*
+			 * Check if we should limit by maximum segment
+			 * size and count:
+			 */
+			if (if_hw_tsomaxsegcount != 0 && if_hw_tsomaxsegsize != 0) {
+				max_len = 0;
+				mb = sbsndmbuf(&so->so_snd, off, &moff);
+
+				while (mb != NULL && (u_int)max_len < len) {
+					u_int cur_length;
+					u_int cur_frags;
+
+					/*
+					 * Get length of mbuf fragment
+					 * and how many hardware
+					 * frags, rounded up, it would
+					 * use:
+					 */
+					cur_length = (mb->m_len - moff);
+					cur_frags = (cur_length + if_hw_tsomaxsegsize -
+					    1) / if_hw_tsomaxsegsize;
+
+					/* Handle special case: Zero Length Mbuf */
+					if (cur_frags == 0)
+						cur_frags = 1;
+
+					/*
+					 * Check if the fragment limit
+					 * will be reached or
+					 * exceeded:
+					 */
+					if (cur_frags >= if_hw_tsomaxsegcount) {
+						max_len += min(cur_length,
+						    if_hw_tsomaxsegcount *
+						    if_hw_tsomaxsegsize);
+						break;
+					}
+					max_len += cur_length;
+					if_hw_tsomaxsegcount -= cur_frags;
+					moff = 0;
+					mb = mb->m_next;
+				}
+				if (max_len <= 0) {
+					len = 0;
+				} else if (len > (u_int)max_len) {
+					sendalot = 1;
+					len = (u_int)max_len;
+				}
+			}
+
+			/*
 			 * Prevent the last segment from being
-			 * fractional unless the send sockbuf can
-			 * be emptied.
+			 * fractional unless the send sockbuf can be
+			 * emptied:
 			 */
-			if (sendalot && off + len < so->so_snd.sb_cc) {
-				len -= len % (tp->t_maxopd - optlen);
+			max_len = (tp->t_maxopd - optlen);
+			if ((off + len) < so->so_snd.sb_cc) {
+				moff = len % (u_int)max_len;
+				if (moff != 0) {
+					len -= moff;
+					sendalot = 1;
+				}
+			}
+
+			/*
+			 * In case there are too many small fragments
+			 * don't use TSO:
+			 */
+			if (len <= (u_int)max_len) {
+				len = (u_int)max_len;
 				sendalot = 1;
+				tso = 0;
 			}
 
 			/*
=== sys/netinet/tcp_subr.c
==================================================================
--- sys/netinet/tcp_subr.c	(revision 271555)
+++ sys/netinet/tcp_subr.c	(local)
@@ -1819,6 +1819,8 @@
 			    ifp->if_hwassist & CSUM_TSO) {
 				cap->ifcap |= CSUM_TSO;
 				cap->tsomax = ifp->if_hw_tsomax;
+				cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
+				cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
 			}
 		}
 		RTFREE(sro.ro_rt);
@@ -1858,6 +1860,8 @@
 			    ifp->if_hwassist & CSUM_TSO) {
 				cap->ifcap |= CSUM_TSO;
 				cap->tsomax = ifp->if_hw_tsomax;
+				cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
+				cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
 			}
 		}
 		RTFREE(sro6.ro_rt);
=== sys/netinet/tcp_var.h
==================================================================
--- sys/netinet/tcp_var.h	(revision 271555)
+++ sys/netinet/tcp_var.h	(local)
@@ -199,9 +199,12 @@
 	u_int	t_keepintvl;		/* interval between keepalives */
 	u_int	t_keepcnt;		/* number of keepalives before close */
 
-	u_int	t_tsomax;		/* tso burst length limit */
+	u_int	t_tsomax;		/* TSO total burst length limit in bytes */
 
-	uint32_t t_ispare[8];		/* 5 UTO, 3 TBD */
+	uint32_t t_ispare[6];		/* 5 UTO, 1 TBD */
+	uint32_t t_tsomaxsegcount;	/* TSO maximum segment count */
+	uint32_t t_tsomaxsegsize;	/* TSO maximum segment size in bytes */
+
 	void	*t_pspare2[4];		/* 1 TCP_SIGNATURE, 3 TBD */
 	uint64_t _pad[6];		/* 6 TBD (1-2 CC/RTT?) */
 };
@@ -324,6 +327,8 @@
 struct tcp_ifcap {
 	int	ifcap;
 	u_int	tsomax;
+	u_int	tsomaxsegcount;
+	u_int	tsomaxsegsize;
 };
 
 #ifndef _NETINET_IN_PCB_H_
=== sys/ofed/drivers/net/mlx4/en_netdev.c
==================================================================
--- sys/ofed/drivers/net/mlx4/en_netdev.c	(revision 271555)
+++ sys/ofed/drivers/net/mlx4/en_netdev.c	(local)
@@ -673,6 +673,11 @@
 	else
 		priv->rx_csum = 0;
 
+	/* set TSO limits so that we don't have to drop TX packets */
+	dev->if_hw_tsomax = 65536 - (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN);
+	dev->if_hw_tsomaxsegcount = 16;
+	dev->if_hw_tsomaxsegsize = 65536;	/* XXX can do up to 4GByte */
+
 	err = mlx4_wol_read(priv->mdev->dev, &config, priv->port);
 	if (err) {
 		en_err(priv, "Failed to get WoL info, unable to modify\n");
=== sys/sys/sockbuf.h
==================================================================
--- sys/sys/sockbuf.h	(revision 271555)
+++ sys/sys/sockbuf.h	(local)
@@ -158,6 +158,8 @@
 	    struct thread *td);
 struct mbuf *
 	sbsndptr(struct sockbuf *sb, u_int off, u_int len, u_int *moff);
+struct mbuf *
+	sbsndmbuf(struct sockbuf *sb, u_int off, u_int *moff);
 void	sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
 int	sbwait(struct sockbuf *sb);
 int	sblock(struct sockbuf *sb, int flags);
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