qeth: new message if OLM limit is reached

z/OS may activate Optimized Latency Mode (OLM) for a connection
through an OSA Express3 adapter, which reduces the number of
allowed concurrent connections, if adapter is used in shared mode.
Create a meaningful message, if activation of an OSA-connection fails
due to an active OLM-connection on the shared OSA-adapter.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 3ba738b2e271..52096c9194f0 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -1976,6 +1976,7 @@ static int qeth_ulp_setup_cb(struct qeth_card *card, struct qeth_reply *reply,
                 unsigned long data)
 {
         struct qeth_cmd_buffer *iob;
+        int rc = 0;
 
         QETH_DBF_TEXT(SETUP, 2, "ulpstpcb");
 
@@ -1983,8 +1984,15 @@ static int qeth_ulp_setup_cb(struct qeth_card *card, struct qeth_reply *reply,
         memcpy(&card->token.ulp_connection_r,
                QETH_ULP_SETUP_RESP_CONNECTION_TOKEN(iob->data),
                QETH_MPC_TOKEN_LENGTH);
+        if (!strncmp("00S", QETH_ULP_SETUP_RESP_CONNECTION_TOKEN(iob->data),
+                     3)) {
+                QETH_DBF_TEXT(SETUP, 2, "olmlimit");
+                dev_err(&card->gdev->dev, "A connection could not be "
+                        "established because of an OLM limit\n");
+                rc = -EMLINK;
+        }
         QETH_DBF_TEXT_(SETUP, 2, "  rc%d", iob->rc);
-        return 0;
+        return rc;
 }
 
 static int qeth_ulp_setup(struct qeth_card *card)