netdev - Re: [PATCH bpf-next v4 05/14] xsk: move queue_id, dev and need

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Message-ID: <00afe3da-0d5e-18fe-b6cb-490faa3dd132@intel.com>
Date:   Tue, 28 Jul 2020 09:09:56 +0200
From:   Björn Töpel <bjorn.topel@...el.com>
To:     Magnus Karlsson <magnus.karlsson@...el.com>, ast@...nel.org,
        daniel@...earbox.net, netdev@...r.kernel.org,
        jonathan.lemon@...il.com, maximmi@...lanox.com
Cc:     bpf@...r.kernel.org, jeffrey.t.kirsher@...el.com,
        anthony.l.nguyen@...el.com, maciej.fijalkowski@...el.com,
        maciejromanfijalkowski@...il.com, cristian.dumitrescu@...el.com
Subject: Re: [PATCH bpf-next v4 05/14] xsk: move queue_id, dev and need_wakeup
 to buffer pool



On 2020-07-21 07:03, Magnus Karlsson wrote:
> Move queue_id, dev, and need_wakeup from the umem to the
> buffer pool. This so that we in a later commit can share the umem
> between multiple HW queues. There is one buffer pool per dev and
> queue id, so these variables should belong to the buffer pool, not
> the umem. Need_wakeup is also something that is set on a per napi
> level, so there is usually one per device and queue id. So move
> this to the buffer pool too.
> 
> Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
> ---
>   include/net/xdp_sock.h      |  3 ---
>   include/net/xsk_buff_pool.h |  4 ++++
>   net/xdp/xdp_umem.c          | 19 +------------------
>   net/xdp/xdp_umem.h          |  4 ----
>   net/xdp/xsk.c               | 40 +++++++++++++++-------------------------
>   net/xdp/xsk_buff_pool.c     | 39 ++++++++++++++++++++++-----------------
>   net/xdp/xsk_diag.c          |  4 ++--
>   7 files changed, 44 insertions(+), 69 deletions(-)
> 
[...]
>   		}
> diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
> index 36287d2..436648a 100644
> --- a/net/xdp/xsk_buff_pool.c
> +++ b/net/xdp/xsk_buff_pool.c
> @@ -95,10 +95,9 @@ void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq)
>   }
>   EXPORT_SYMBOL(xp_set_rxq_info);
>   
> -int xp_assign_dev(struct xsk_buff_pool *pool, struct net_device *dev,
> +int xp_assign_dev(struct xsk_buff_pool *pool, struct net_device *netdev,
>   		  u16 queue_id, u16 flags)
>   {
> -	struct xdp_umem *umem = pool->umem;
>   	bool force_zc, force_copy;
>   	struct netdev_bpf bpf;
>   	int err = 0;
> @@ -111,27 +110,30 @@ int xp_assign_dev(struct xsk_buff_pool *pool, struct net_device *dev,
>   	if (force_zc && force_copy)
>   		return -EINVAL;
>   
> -	if (xsk_get_pool_from_qid(dev, queue_id))
> +	if (xsk_get_pool_from_qid(netdev, queue_id))
>   		return -EBUSY;
>   
> -	err = xsk_reg_pool_at_qid(dev, pool, queue_id);
> +	err = xsk_reg_pool_at_qid(netdev, pool, queue_id);
>   	if (err)
>   		return err;
>   
>   	if (flags & XDP_USE_NEED_WAKEUP) {
> -		umem->flags |= XDP_UMEM_USES_NEED_WAKEUP;
> +		pool->uses_need_wakeup = true;
>   		/* Tx needs to be explicitly woken up the first time.
>   		 * Also for supporting drivers that do not implement this
>   		 * feature. They will always have to call sendto().
>   		 */
> -		umem->need_wakeup = XDP_WAKEUP_TX;
> +		pool->cached_need_wakeup = XDP_WAKEUP_TX;
>   	}
>   
> +	dev_hold(netdev);
> +

You have a reference leak here for the error case.


Björn