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Message-ID: <3a1a2089-a7fa-2a7c-7040-c0aa62b08960@gmail.com>
Date: Tue, 9 Mar 2021 16:32:59 +0800
From: Jia-Ju Bai <baijiaju1990@...il.com>
To: Roi Dayan <roid@...dia.com>, saeedm@...dia.com, leon@...nel.org,
davem@...emloft.net, kuba@...nel.org
Cc: netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: mellanox: mlx5: fix error return code of
mlx5e_stats_flower()
On 2021/3/9 16:24, Roi Dayan wrote:
>
>
> On 2021-03-09 10:20 AM, Roi Dayan wrote:
>>
>>
>> On 2021-03-06 3:47 PM, Jia-Ju Bai wrote:
>>> When mlx5e_tc_get_counter() returns NULL to counter or
>>> mlx5_devcom_get_peer_data() returns NULL to peer_esw, no error return
>>> code of mlx5e_stats_flower() is assigned.
>>> To fix this bug, err is assigned with -EINVAL in these cases.
>>>
>>> Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
>>> Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
>>> ---
>>> drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 12 +++++++++---
>>> 1 file changed, 9 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
>>> b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
>>> index 0da69b98f38f..1f2c9da7bd35 100644
>>> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
>>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
>>> @@ -4380,8 +4380,10 @@ int mlx5e_stats_flower(struct net_device
>>> *dev, struct mlx5e_priv *priv,
>>> if (mlx5e_is_offloaded_flow(flow) || flow_flag_test(flow, CT)) {
>>> counter = mlx5e_tc_get_counter(flow);
>>> - if (!counter)
>>> + if (!counter) {
>>> + err = -EINVAL;
>>> goto errout;
>>> + }
>>> mlx5_fc_query_cached(counter, &bytes, &packets, &lastuse);
>>> }
>>> @@ -4390,8 +4392,10 @@ int mlx5e_stats_flower(struct net_device
>>> *dev, struct mlx5e_priv *priv,
>>> * un-offloaded while the other rule is offloaded.
>>> */
>>> peer_esw = mlx5_devcom_get_peer_data(devcom,
>>> MLX5_DEVCOM_ESW_OFFLOADS);
>>> - if (!peer_esw)
>>> + if (!peer_esw) {
>>> + err = -EINVAL;
>>
>> note here it's not an error. it could be there is no peer esw
>> so just continue with the stats update.
>>
>>> goto out;
>>> + }
>>> if (flow_flag_test(flow, DUP) &&
>>> flow_flag_test(flow->peer_flow, OFFLOADED)) {
>>> @@ -4400,8 +4404,10 @@ int mlx5e_stats_flower(struct net_device
>>> *dev, struct mlx5e_priv *priv,
>>> u64 lastuse2;
>>> counter = mlx5e_tc_get_counter(flow->peer_flow);
>>> - if (!counter)
>>> + if (!counter) {
>>> + err = -EINVAL;
>
> this change is problematic. the current goto is to do stats update with
> the first counter stats we got but if you now want to return an error
> then you probably should not do any update at all.
Thanks for your reply :)
I am not sure whether an error code should be returned here?
If so, flow_stats_update(...) should not be called here?
Best wishes,
Jia-Ju Bai
>
>>> goto no_peer_counter;
>>> + }
>>> mlx5_fc_query_cached(counter, &bytes2, &packets2, &lastuse2);
>>> bytes += bytes2;
>>>
>>
>>
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