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ibmvnic: Revert to previous mtu when unsupported value requested 

If we request an unsupported mtu value, the vnic server will suggest a
different value. Currently we take the suggested value without question
and login with that value. However, the behavior doesn't seem completely
sane as attempting to change the mtu to some specific value will change
the mtu to some completely different value most of the time. This patch
fixes the issue by logging in with the previously used mtu value and
printing an error message saying that the given mtu is unsupported.

Signed-off-by: John Allen <jallen@linux.vnet.ibm.com>
Reviewed-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Allen 2018-01-18 16:27:12 -06:00 committed by David S. Miller
parent 896d86959f
commit e791380340
1 changed files with 11 additions and 1 deletions
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12
drivers/net/ethernet/ibm/ibmvnic.c
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@ -3623,7 +3623,17 @@ static void handle_request_cap_rsp(union ibmvnic_crq *crq,
*req_value,
(long int)be64_to_cpu(crq->request_capability_rsp.
number), name);
*req_value = be64_to_cpu(crq->request_capability_rsp.number);
if (be16_to_cpu(crq->request_capability_rsp.capability) ==
REQ_MTU) {
pr_err("mtu of %llu is not supported. Reverting.\n",
*req_value);
*req_value = adapter->fallback.mtu;
} else {
*req_value =
be64_to_cpu(crq->request_capability_rsp.number);
}
ibmvnic_send_req_caps(adapter, 1);
return;
default: