5.15-stable review patch. If anyone has any objections, please let me know.
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From: Nick Child nnac123@linux.ibm.com
[ Upstream commit 49bbeb5719c2f56907d3a9623b47c6c15c2c431d ]
There are 2 types of outstanding tx skb's: Type 1: Packets that are sitting in the drivers ind_buff that are waiting to be batch sent to the NIC. During a device reset, these are freed with a call to ibmvnic_tx_scrq_clean_buffer() Type 2: Packets that have been sent to the NIC and are awaiting a TX completion IRQ. These are free'd during a reset with a call to clean_tx_pools()
During any reset which requires us to free the tx irq, ensure that the Type 2 skb references are freed. Since the irq is released, it is impossible for the NIC to inform of any completions.
Furthermore, later in the reset process is a call to init_tx_pools() which marks every entry in the tx pool as free (ie not outstanding). So if the driver is to make a call to init_tx_pools(), it must first be sure that the tx pool is empty of skb references.
This issue was discovered by observing the following in the logs during EEH testing: TX free map points to untracked skb (tso_pool 0 idx=4) TX free map points to untracked skb (tso_pool 0 idx=5) TX free map points to untracked skb (tso_pool 1 idx=36)
Fixes: 65d6470d139a ("ibmvnic: clean pending indirect buffs during reset") Signed-off-by: Nick Child nnac123@linux.ibm.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/ibm/ibmvnic.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 890e27b986e2a..7f4539a2e5517 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -3409,6 +3409,12 @@ static void release_sub_crqs(struct ibmvnic_adapter *adapter, bool do_h_free) adapter->num_active_tx_scrqs = 0; }
+ /* Clean any remaining outstanding SKBs + * we freed the irq so we won't be hearing + * from them + */ + clean_tx_pools(adapter); + if (adapter->rx_scrq) { for (i = 0; i < adapter->num_active_rx_scrqs; i++) { if (!adapter->rx_scrq[i])