netdev - Re: [PATCH net-next v4 2/3] net: ethernet: ti: Add desc_infos member to struct k3_cppi_desc

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Date: Tue, 26 Mar 2024 10:20:04 +0530
From: Ratheesh Kannoth <rkannoth@...vell.com>
To: Julien Panis <jpanis@...libre.com>
CC: "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni
	<pabeni@...hat.com>, Russell King <linux@...linux.org.uk>,
        Alexei Starovoitov
	<ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard
 Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Sumit
 Semwal <sumit.semwal@...aro.org>,
        Christian König
	<christian.koenig@....com>,
        Simon Horman <horms@...nel.org>, Andrew Lunn
	<andrew@...n.ch>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <bpf@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <linaro-mm-sig@...ts.linaro.org>
Subject: Re: [PATCH net-next v4 2/3] net: ethernet: ti: Add desc_infos member
 to struct k3_cppi_desc_pool

On 2024-03-25 at 21:30:36, Julien Panis (jpanis@...libre.com) wrote:
> This patch introduces a member and the related accessors which can be
> used to store descriptor specific additional information. This member
> can store, for instance, an ID to differentiate a skb TX buffer type
> from a xdpf TX buffer type.
>
> Signed-off-by: Julien Panis <jpanis@...libre.com>
> ---
>  drivers/net/ethernet/ti/k3-cppi-desc-pool.c | 24 ++++++++++++++++++++++++
>  drivers/net/ethernet/ti/k3-cppi-desc-pool.h |  2 ++
>  2 files changed, 26 insertions(+)
>
> diff --git a/drivers/net/ethernet/ti/k3-cppi-desc-pool.c b/drivers/net/ethernet/ti/k3-cppi-desc-pool.c
> index fe8203c05731..d0c68d722ef2 100644
> --- a/drivers/net/ethernet/ti/k3-cppi-desc-pool.c
> +++ b/drivers/net/ethernet/ti/k3-cppi-desc-pool.c
> @@ -22,6 +22,7 @@ struct k3_cppi_desc_pool {
>  	size_t			mem_size;
>  	size_t			num_desc;
>  	struct gen_pool		*gen_pool;
> +	void			**desc_infos;
>  };
>
>  void k3_cppi_desc_pool_destroy(struct k3_cppi_desc_pool *pool)
> @@ -72,6 +73,15 @@ k3_cppi_desc_pool_create_name(struct device *dev, size_t size,
>  		goto gen_pool_create_fail;
>  	}
>
> +	pool->desc_infos = devm_kcalloc(dev, pool->num_desc,
> +					sizeof(*pool->desc_infos), GFP_KERNEL);
This should be freed as well, right ?
.set_channels() in ethtool ops cleans pools; but not this. This wont
result in memory leak ? s/devm_kcalloc/kcalloc if my comment
is correct.

> +	if (!pool->desc_infos) {
> +		ret = -ENOMEM;
> +		dev_err(pool->dev, "pool descriptor infos alloc failed %d\n", ret);
> +		kfree_const(pool_name);
> +		goto gen_pool_desc_infos_alloc_fail;
> +	}
> +
>  	pool->gen_pool->name = pool_name;
>
>  	pool->cpumem = dma_alloc_coherent(pool->dev, pool->mem_size,
> @@ -94,6 +104,8 @@ k3_cppi_desc_pool_create_name(struct device *dev, size_t size,
>  	dma_free_coherent(pool->dev, pool->mem_size, pool->cpumem,
>  			  pool->dma_addr);
>  dma_alloc_fail:
> +	devm_kfree(pool->dev, pool->desc_infos);
> +gen_pool_desc_infos_alloc_fail:
>  	gen_pool_destroy(pool->gen_pool);	/* frees pool->name */
>  gen_pool_create_fail:
>  	devm_kfree(pool->dev, pool);
> @@ -144,5 +156,17 @@ void *k3_cppi_desc_pool_cpuaddr(struct k3_cppi_desc_pool *pool)
>  }
>  EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_cpuaddr);
>
> +void k3_cppi_desc_pool_desc_info_set(struct k3_cppi_desc_pool *pool, int desc_idx, void *info)
> +{
> +	pool->desc_infos[desc_idx] = info;
> +}
> +EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_desc_info_set);
> +
> +void *k3_cppi_desc_pool_desc_info(struct k3_cppi_desc_pool *pool, int desc_idx)
> +{
> +	return pool->desc_infos[desc_idx];
> +}
> +EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_desc_info);
> +
>  MODULE_LICENSE("GPL");
>  MODULE_DESCRIPTION("TI K3 CPPI5 descriptors pool API");
> diff --git a/drivers/net/ethernet/ti/k3-cppi-desc-pool.h b/drivers/net/ethernet/ti/k3-cppi-desc-pool.h
> index 149d5579a5e2..0076596307e7 100644
> --- a/drivers/net/ethernet/ti/k3-cppi-desc-pool.h
> +++ b/drivers/net/ethernet/ti/k3-cppi-desc-pool.h
> @@ -28,5 +28,7 @@ void k3_cppi_desc_pool_free(struct k3_cppi_desc_pool *pool, void *addr);
>  size_t k3_cppi_desc_pool_avail(struct k3_cppi_desc_pool *pool);
>  size_t k3_cppi_desc_pool_desc_size(struct k3_cppi_desc_pool *pool);
>  void *k3_cppi_desc_pool_cpuaddr(struct k3_cppi_desc_pool *pool);
> +void k3_cppi_desc_pool_desc_info_set(struct k3_cppi_desc_pool *pool, int desc_idx, void *info);
> +void *k3_cppi_desc_pool_desc_info(struct k3_cppi_desc_pool *pool, int desc_idx);
>
>  #endif /* K3_CPPI_DESC_POOL_H_ */
>
> --
> 2.37.3
>