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s390/qeth: display warning for OSA3 RX/TX checksum offloading 

When RX/TX checksum offloading is turned on and the adapter is
an OSA 3 card in layer 3 mode, the checksum offloading is only
performed when both peers use different adapters. If both peers
share an OSA 3 card, communication is a memory copy and
checksum offloading is not performed.

This patch adds a warning to inform the administrator.

OSA 3 in layer 2 mode does not offer the RX/TX checksum
offload feature.

Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Reviewed-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Thomas Richter 2017-01-12 15:48:34 +01:00 committed by David S. Miller
parent f9d8e6dc0f
commit dae84c8e2a
1 changed files with 5 additions and 0 deletions
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5
drivers/s390/net/qeth_core_main.c
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@ -6116,6 +6116,11 @@ static int qeth_send_checksum_on(struct qeth_card *card, int cstype)
if ((required_features & chksum_cb.supported) !=
required_features)
rc = -EIO;
else if (!(QETH_IPA_CHECKSUM_LP2LP & chksum_cb.supported) &&
cstype == IPA_INBOUND_CHECKSUM)
dev_warn(&card->gdev->dev,
"Hardware checksumming is performed only if %s and its peer use different OSA Express 3 ports\n",
QETH_CARD_IFNAME(card));
}
if (rc) {
qeth_send_simple_setassparms(card, cstype, IPA_CMD_ASS_STOP, 0);