netdev - Re: [PATCH net-next v3] net: mana: Allow variable size indirection table

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Date: Mon, 3 Jun 2024 11:41:22 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Shradha Gupta <shradhagupta@...ux.microsoft.com>
Cc: linux-hardening@...r.kernel.org, netdev@...r.kernel.org,
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-rdma@...r.kernel.org, Colin Ian King <colin.i.king@...il.com>,
	Ahmed Zaki <ahmed.zaki@...el.com>,
	Pavan Chebbi <pavan.chebbi@...adcom.com>,
	Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>,
	Konstantin Taranov <kotaranov@...rosoft.com>,
	Kees Cook <keescook@...omium.org>, Paolo Abeni <pabeni@...hat.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Dexuan Cui <decui@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Jason Gunthorpe <jgg@...pe.ca>, Long Li <longli@...rosoft.com>,
	Shradha Gupta <shradhagupta@...rosoft.com>
Subject: Re: [PATCH net-next v3] net: mana: Allow variable size indirection
 table

On Fri, May 31, 2024 at 08:37:41AM -0700, Shradha Gupta wrote:
> Allow variable size indirection table allocation in MANA instead
> of using a constant value MANA_INDIRECT_TABLE_SIZE.
> The size is now derived from the MANA_QUERY_VPORT_CONFIG and the
> indirection table is allocated dynamically.
> 
> Signed-off-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>
> Reviewed-by: Dexuan Cui <decui@...rosoft.com>
> Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
> ---
>  Changes in v3:
>  * Fixed the memory leak(save_table) in mana_set_rxfh()
> 
>  Changes in v2:
>  * Rebased to latest net-next tree
>  * Rearranged cleanup code in mana_probe_port to avoid extra operations
> ---
>  drivers/infiniband/hw/mana/qp.c               | 10 +--
>  drivers/net/ethernet/microsoft/mana/mana_en.c | 68 ++++++++++++++++---
>  .../ethernet/microsoft/mana/mana_ethtool.c    | 27 +++++---
>  include/net/mana/gdma.h                       |  4 +-
>  include/net/mana/mana.h                       |  9 +--
>  5 files changed, 89 insertions(+), 29 deletions(-)

<...>

> +free_indir:
> +	apc->indir_table_sz = 0;
> +	kfree(apc->indir_table);
> +	apc->indir_table = NULL;
> +	kfree(apc->rxobj_table);
> +	apc->rxobj_table = NULL;
>  reset_apc:
>  	kfree(apc->rxqs);
>  	apc->rxqs = NULL;
> @@ -2897,6 +2936,7 @@ void mana_remove(struct gdma_dev *gd, bool suspending)
>  {

<...>

> @@ -2931,6 +2972,11 @@ void mana_remove(struct gdma_dev *gd, bool suspending)
>  		}
>  
>  		unregister_netdevice(ndev);
> +		apc->indir_table_sz = 0;
> +		kfree(apc->indir_table);
> +		apc->indir_table = NULL;
> +		kfree(apc->rxobj_table);
> +		apc->rxobj_table = NULL;

Why do you need to NULLify here? Will apc is going to be accessible
after call to mana_remove? or port probe failure?

Thanks