netdev - Re: [PATCH net v3 2/4] flow_offload: fix incorrect cb_priv check for flow_block

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Date:   Tue, 16 Jun 2020 22:20:46 +0800
From:   wenxu <wenxu@...oud.cn>
To:     Simon Horman <simon.horman@...ronome.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, pablo@...filter.org,
        vladbu@...lanox.com
Subject: Re: [PATCH net v3 2/4] flow_offload: fix incorrect cb_priv check for
 flow_block_cb


在 2020/6/16 18:51, Simon Horman 写道:
> On Tue, Jun 16, 2020 at 11:19:38AM +0800, wenxu@...oud.cn wrote:
>> From: wenxu <wenxu@...oud.cn>
>>
>> In the function __flow_block_indr_cleanup, The match stataments
>> this->cb_priv == cb_priv is always false, the flow_block_cb->cb_priv
>> is totally different data with the flow_indr_dev->cb_priv.
>>
>> Store the representor cb_priv to the flow_block_cb->indr.cb_priv in
>> the driver.
>>
>> Fixes: 1fac52da5942 ("net: flow_offload: consolidate indirect flow_block infrastructure")
>> Signed-off-by: wenxu <wenxu@...oud.cn>
> Hi Wenxu,
>
> I wonder if this can be resolved by using the cb_ident field of struct
> flow_block_cb.
>
> I observe that mlx5e_rep_indr_setup_block() seems to be the only call-site
> where the value of the cb_ident parameter of flow_block_cb_alloc() is
> per-block rather than per-device. So part of my proposal is to change
> that.

I check all the xxdriver_indr_setup_block. It seems all the cb_ident parameter of

flow_block_cb_alloc is per-block. Both in the nfp_flower_setup_indr_tc_block

and bnxt_tc_setup_indr_block.


nfp_flower_setup_indr_tc_block:

struct nfp_flower_indr_block_cb_priv *cb_priv;

block_cb = flow_block_cb_alloc(nfp_flower_setup_indr_block_cb,
                                               cb_priv, cb_priv,
                                               nfp_flower_setup_indr_tc_release);


bnxt_tc_setup_indr_block:

struct bnxt_flower_indr_block_cb_priv *cb_priv;

block_cb = flow_block_cb_alloc(bnxt_tc_setup_indr_block_cb,
                                               cb_priv, cb_priv,
                                               bnxt_tc_setup_indr_rel);


And the function flow_block_cb_is_busy called in most place. Pass the

parameter as cb_priv but not cb_indent .







>
> The other part of my proposal is to make use of cb_ident in
> __flow_block_indr_cleanup(). Which does seem to match the intended
> purpose of cb_ident. Perhaps it would also be good to document what
> the intended purpose of cb_ident (and the other fields of struct
> flow_block_cb) is.
>
> Compile tested only.
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
> index a62bcf0cf512..4de6fcae5252 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
> @@ -438,7 +438,7 @@ mlx5e_rep_indr_setup_block(struct net_device *netdev,
>  		list_add(&indr_priv->list,
>  			 &rpriv->uplink_priv.tc_indr_block_priv_list);
>  
> -		block_cb = flow_block_cb_alloc(setup_cb, indr_priv, indr_priv,
> +		block_cb = flow_block_cb_alloc(setup_cb, rpriv, indr_priv,
>  					       mlx5e_rep_indr_block_unbind);
>  		if (IS_ERR(block_cb)) {
>  			list_del(&indr_priv->list);
> diff --git a/net/core/flow_offload.c b/net/core/flow_offload.c
> index b288d2f03789..d281fb182894 100644
> --- a/net/core/flow_offload.c
> +++ b/net/core/flow_offload.c
> @@ -373,14 +373,13 @@ int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv)
>  EXPORT_SYMBOL(flow_indr_dev_register);
>  
>  static void __flow_block_indr_cleanup(void (*release)(void *cb_priv),
> -				      void *cb_priv,
> +				      void *cb_ident,
>  				      struct list_head *cleanup_list)
>  {
>  	struct flow_block_cb *this, *next;
>  
>  	list_for_each_entry_safe(this, next, &flow_block_indr_list, indr.list) {
> -		if (this->release == release &&
> -		    this->cb_priv == cb_priv) {
> +		if (this->release == release && this->cb_ident == cb_ident) {
>  			list_move(&this->indr.list, cleanup_list);
>  			return;
>  		}
>