Function lagg_capabilities

freebsd/net/if_lagg.c:665–718

}

static void
lagg_capabilities(struct lagg_softc *sc)
{
	struct lagg_port *lp;
	int cap, ena, pena;
	uint64_t hwa;
	struct ifnet_hw_tsomax hw_tsomax;

	LAGG_XLOCK_ASSERT(sc);

	/* Get common enabled capabilities for the lagg ports */
	ena = ~0;
	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
		ena &= lp->lp_ifp->if_capenable;
	ena = (ena == ~0 ? 0 : ena);

	/*
	 * Apply common enabled capabilities back to the lagg ports.
	 * May require several iterations if they are dependent.
	 */
	do {
		pena = ena;
		CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
			lagg_setcaps(lp, ena);
			ena &= lp->lp_ifp->if_capenable;
		}
	} while (pena != ena);

	/* Get other capabilities from the lagg ports */
	cap = ~0;
	hwa = ~(uint64_t)0;
	memset(&hw_tsomax, 0, sizeof(hw_tsomax));
	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
		cap &= lp->lp_ifp->if_capabilities;
		hwa &= lp->lp_ifp->if_hwassist;
		if_hw_tsomax_common(lp->lp_ifp, &hw_tsomax);
	}
	cap = (cap == ~0 ? 0 : cap);
	hwa = (hwa == ~(uint64_t)0 ? 0 : hwa);

	if (sc->sc_ifp->if_capabilities != cap ||
	    sc->sc_ifp->if_capenable != ena ||
	    sc->sc_ifp->if_hwassist != hwa ||
	    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;
		getmicrotime(&sc->sc_ifp->if_lastchange);

		if (sc->sc_ifflags & IFF_DEBUG)
			if_printf(sc->sc_ifp,
			    "capabilities 0x%08x enabled 0x%08x\n", cap, ena);
	}
}

static int
lagg_port_create(struct lagg_softc *sc, struct ifnet *ifp)