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Commit 6e6f472d authored by Julian Wiedmann's avatar Julian Wiedmann Committed by David S. Miller
Browse files

s390/qeth: clean up initial MTU determination 



1. Drop the support for Token Ring,
2. use the ETH_DATA_LEN macro for the default L2 MTU,
3. handle OSM via the default case (as OSM is L2-only), and
4. document why the L3 MTU is reduced.

Signed-off-by: default avatarJulian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 83cf79a2

drivers/s390/net/qeth_core_main.c

+4 −10
Original line number Diff line number Diff line
@@ -2219,18 +2219,12 @@ static int qeth_get_initial_mtu_for_card(struct qeth_card *card) 
	case QETH_CARD_TYPE_IQD:

		return card->info.max_mtu;

	case QETH_CARD_TYPE_OSD:

		switch (card->info.link_type) {

		case QETH_LINK_TYPE_HSTR:

		case QETH_LINK_TYPE_LANE_TR:

			return 2000;

		default:

			return card->options.layer2 ? 1500 : 1492;

		}

	case QETH_CARD_TYPE_OSM:

	case QETH_CARD_TYPE_OSX:

		return card->options.layer2 ? 1500 : 1492;

		if (!card->options.layer2)

			return ETH_DATA_LEN - 8; /* L3: allow for LLC + SNAP */

		/* fall through */

	default:

		return 1500;

		return ETH_DATA_LEN;

	}

}