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

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
...@@ -2219,18 +2219,12 @@ static int qeth_get_initial_mtu_for_card(struct qeth_card *card) ...@@ -2219,18 +2219,12 @@ static int qeth_get_initial_mtu_for_card(struct qeth_card *card)
case QETH_CARD_TYPE_IQD: case QETH_CARD_TYPE_IQD:
return card->info.max_mtu; return card->info.max_mtu;
case QETH_CARD_TYPE_OSD: 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: 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: default:
return 1500; return ETH_DATA_LEN;
} }
} }
......
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