s390/qeth: use diag26c to get MAC address on L2
When a s390 guest runs on a z/VM host that's part of a SSI cluster,
it can be migrated to a different host. In this case, the MAC address
it originally obtained on the old host may be re-assigned to a new
guest. This would result in address conflicts between the two guests.
When running as z/VM guest, use the diag26c MAC Service to obtain
a hypervisor-managed MAC address. The MAC Service is SSI-aware, and
won't re-assign the address after the guest is migrated to a new host.
This patch adds support for the z/VM MAC Service on L2 devices.
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Acked-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 9e7f12a..ad110ab 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -21,6 +21,7 @@
#include <linux/hash.h>
#include <linux/hashtable.h>
#include <linux/string.h>
+#include <asm/setup.h>
#include "qeth_core.h"
#include "qeth_l2.h"
@@ -505,9 +506,19 @@ static int qeth_l2_request_initial_mac(struct qeth_card *card)
int rc = 0;
char vendor_pre[] = {0x02, 0x00, 0x00};
- QETH_DBF_TEXT(SETUP, 2, "doL2init");
+ QETH_DBF_TEXT(SETUP, 2, "l2reqmac");
QETH_DBF_TEXT_(SETUP, 2, "doL2%s", CARD_BUS_ID(card));
+ if (MACHINE_IS_VM) {
+ rc = qeth_vm_request_mac(card);
+ if (!rc)
+ goto out;
+ QETH_DBF_MESSAGE(2, "z/VM MAC Service failed on device %s: x%x\n",
+ CARD_BUS_ID(card), rc);
+ QETH_DBF_TEXT_(SETUP, 2, "err%04x", rc);
+ /* fall back to alternative mechanism: */
+ }
+
if (qeth_is_supported(card, IPA_SETADAPTERPARMS)) {
rc = qeth_query_setadapterparms(card);
if (rc) {
@@ -528,11 +539,12 @@ static int qeth_l2_request_initial_mac(struct qeth_card *card)
QETH_DBF_TEXT_(SETUP, 2, "1err%04x", rc);
return rc;
}
- QETH_DBF_HEX(SETUP, 2, card->dev->dev_addr, OSA_ADDR_LEN);
} else {
eth_random_addr(card->dev->dev_addr);
memcpy(card->dev->dev_addr, vendor_pre, 3);
}
+out:
+ QETH_DBF_HEX(SETUP, 2, card->dev->dev_addr, card->dev->addr_len);
return 0;
}