diff options
| author |   Thomas Richter <tmricht@linux.vnet.ibm.com> | 2017-01-12 15:48:34 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-01-12 10:02:43 -0500 |
| commit | dae84c8e2a88fab45ff943675410b6c9c0d96a15 (patch) | |
| tree | 861908a825be1ab16c8056daca757fba33def522 /drivers/s390/net | |
| parent | s390/qeth: test RX/TX checksum offload reply (diff) | |
| download | linux-dev-dae84c8e2a88fab45ff943675410b6c9c0d96a15.tar.xz linux-dev-dae84c8e2a88fab45ff943675410b6c9c0d96a15.zip | |
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>
Diffstat (limited to 'drivers/s390/net')
| -rw-r--r-- | drivers/s390/net/qeth_core_main.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 49b813f8f91b..ca8309ff3ad4 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); |