From 6e6f472d92bd4ccd88a9a12e55b484ab417c168c Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Wed, 18 Oct 2017 17:40:18 +0200 Subject: [PATCH] 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: Julian Wiedmann Signed-off-by: David S. Miller --- drivers/s390/net/qeth_core_main.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 735b03cae727..acf16fa75c63 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -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; } } -- 2.11.0