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ibmvnic: drop bad optimization in reuse_tx_pools()

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When trying to decide whether or not reuse existing rx/tx pools
we tried to allow a range of values for the pool parameters rather
than exact matches. This was intended to reuse the resources for
instance when switching between two VIO servers with different
default parameters.

But this optimization is incomplete and breaks when we try to
change the number of queues for instance. The optimization needs
to be updated, so drop it for now and simplify the code.

Fixes: bbd809305bc7 ("ibmvnic: Reuse tx pools when possible")
Reported-by: Dany Madden <drt@linux.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Reviewed-by: Dany Madden <drt@linux.ibm.com>
Reviewed-by: Rick Lindsley <ricklind@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sukadev Bhattiprolu 2021-11-30 21:48:36 -08:00 committed by David S. Miller
parent 0584f49496
commit 5b08560181
1 changed files with 3 additions and 11 deletions
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14
drivers/net/ethernet/ibm/ibmvnic.c
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@ -866,17 +866,9 @@ static bool reuse_tx_pools(struct ibmvnic_adapter *adapter)
old_mtu = adapter->prev_mtu;
new_mtu = adapter->req_mtu;
/* Require MTU to be exactly same to reuse pools for now */
if (old_mtu != new_mtu)
return false;
if (old_num_pools == new_num_pools && old_pool_size == new_pool_size)
return true;
if (old_num_pools < adapter->min_tx_queues ||
old_num_pools > adapter->max_tx_queues ||
old_pool_size < adapter->min_tx_entries_per_subcrq ||
old_pool_size > adapter->max_tx_entries_per_subcrq)
if (old_mtu != new_mtu ||
old_num_pools != new_num_pools ||
old_pool_size != new_pool_size)
return false;
return true;