From: Thomas Richter <tmricht@xxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Ursula Braun <ubraun@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Julian Wiedmann <jwi@xxxxxxxxxxxxxxxxxx>
---
drivers/s390/net/qeth_core_main.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 49b813f..ca8309f 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -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);
--
2.8.4
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