ibmvnic: Reset long term map ID counter

When allocating RX or TX buffer pools, the driver needs to provide a
unique mapping ID to firmware for each pool. This value is assigned
using a counter which is incremented after a new pool is created. The
ID can be an integer ranging from 1-255. When migrating to a device
that requests a different number of queues, this value was not being
reset properly. As a result, after enough migrations, the counter
exceeded the upper bound and pool creation failed. This is fixed by
resetting the counter to one in this case.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index dd4a294..ce127a7 100644 (file)
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1644,6 +1644,7 @@ static int do_reset(struct ibmvnic_adapter *adapter,
                                return rc;
                } else if (adapter->req_rx_queues != old_num_rx_queues ||
                           adapter->req_tx_queues != old_num_tx_queues) {
+                       adapter->map_id = 1;
                        release_rx_pools(adapter);
                        release_tx_pools(adapter);
                        init_rx_pools(netdev);