Author: rmacklem
Date: Mon Apr 14 20:34:48 2014
New Revision: 264469
URL: http://svnweb.freebsd.org/changeset/base/264469
Log:
Lagg did not set the value of if_hw_tsomax, so when lagg
was stacked on top of network interfaces that set if_hw_tsomax,
tcp_output() would see the default value instead of the value
set by the network interface(s). This patch modifies lagg so that
it sets if_hw_tsomax to the minimum of the value(s) for the
underlying network interfaces.
Reviewed by: glebius
MFC after: 2 weeks
Modified:
head/sys/net/if_lagg.c
Modified: head/sys/net/if_lagg.c
==============================================================================
--- head/sys/net/if_lagg.c Mon Apr 14 19:00:20 2014 (r264468)
+++ head/sys/net/if_lagg.c Mon Apr 14 20:34:48 2014 (r264469)
@@ -448,6 +448,7 @@ lagg_capabilities(struct lagg_softc *sc)
struct lagg_port *lp;
int cap = ~0, ena = ~0;
u_long hwa = ~0UL;
+ u_int hw_tsomax = IP_MAXPACKET; /* Initialize to the maximum value. */
LAGG_WLOCK_ASSERT(sc);
@@ -456,6 +457,10 @@ lagg_capabilities(struct lagg_softc *sc)
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;
}
cap = (cap == ~0 ? 0 : cap);
ena = (ena == ~0 ? 0 : ena);
@@ -463,10 +468,12 @@ lagg_capabilities(struct lagg_softc *sc)
if (sc->sc_ifp->if_capabilities != cap ||
sc->sc_ifp->if_capenable != ena ||
- sc->sc_ifp->if_hwassist != hwa) {
+ sc->sc_ifp->if_hwassist != hwa ||
+ sc->sc_ifp->if_hw_tsomax != hw_tsomax) {
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)
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