diff options
| author | Rick Lindsley <ricklind@us.ibm.com> | 2022-07-02 13:37:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-12 17:29:02 +0300 |
| commit | 37936ef7fcc7184dafe7ea60043e3a75e180143b (patch) | |
| tree | dbec77800bd6247be72b3e09c7e0494f07cd4d8d /drivers/net/ethernet/ibm | |
| parent | 59b2c62cd131f515a6043d310aa630c407677d10 (diff) | |
| download | linux-37936ef7fcc7184dafe7ea60043e3a75e180143b.tar.xz | |
ibmvnic: Properly dispose of all skbs during a failover.
[ Upstream commit 1b18f09d31cfa7148df15a7d5c5e0e86f105f7d1 ]
During a reset, there may have been transmits in flight that are no
longer valid and cannot be fulfilled. Resetting and clearing the
queues is insufficient; each skb also needs to be explicitly freed
so that upper levels are not left waiting for confirmation of a
transmit that will never happen. If this happens frequently enough,
the apparent backlog will cause TCP to begin "congestion control"
unnecessarily, culminating in permanently decreased throughput.
Fixes: d7c0ef36bde03 ("ibmvnic: Free and re-allocate scrqs when tx/rx scrqs change")
Tested-by: Nick Child <nnac123@linux.ibm.com>
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Rick Lindsley <ricklind@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/ibm')
| -rw-r--r-- | drivers/net/ethernet/ibm/ibmvnic.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index ae3eea4a4213..1463cf4321a8 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -4691,6 +4691,15 @@ static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter) release_sub_crqs(adapter, 0); rc = init_sub_crqs(adapter); } else { + /* no need to reinitialize completely, but we do + * need to clean up transmits that were in flight + * when we processed the reset. Failure to do so + * will confound the upper layer, usually TCP, by + * creating the illusion of transmits that are + * awaiting completion. + */ + clean_tx_pools(adapter); + rc = reset_sub_crq_queues(adapter); } } else { |