From: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
To: netdev@vger.kernel.org
Cc: Brian King <brking@linux.ibm.com>,
Dany Madden <drt@linux.ibm.com>,
Rick Lindsley <ricklind@linux.ibm.com>
Subject: [PATCH net 2/2] ibmvnic: drop bad optimization in reuse_tx_pools()
Date: Tue, 30 Nov 2021 21:48:36 -0800 [thread overview]
Message-ID: <20211201054836.3488211-2-sukadev@linux.ibm.com> (raw)
In-Reply-To: <20211201054836.3488211-1-sukadev@linux.ibm.com>
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>
---
drivers/net/ethernet/ibm/ibmvnic.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 6df92a872f0f..0bb3911dd014 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -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;
--
2.27.0
next prev parent reply other threads:[~2021-12-01 5:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-01 5:48 [PATCH net 1/2] ibmvnic: drop bad optimization in reuse_rx_pools() Sukadev Bhattiprolu
2021-12-01 5:48 ` Sukadev Bhattiprolu [this message]
2021-12-01 18:13 ` [PATCH net 2/2] ibmvnic: drop bad optimization in reuse_tx_pools() Dany Madden
2021-12-01 18:18 ` Rick Lindsley
2021-12-01 18:12 ` [PATCH net 1/2] ibmvnic: drop bad optimization in reuse_rx_pools() Dany Madden
2021-12-01 18:18 ` Rick Lindsley
2021-12-02 12:20 ` patchwork-bot+netdevbpf
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