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ibmvnic: Reset long term map ID counter

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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>
This commit is contained in:
Thomas Falcon 2018-02-09 11:41:09 -06:00 committed by David S. Miller
parent 437a4db66d
commit faefaa9721
1 changed files with 1 additions and 0 deletions
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drivers/net/ethernet/ibm/ibmvnic.c
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@ -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);