linux-kernel - RE: [PATCH net-next 4/5] r8152: support skb_add_rx

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Message-ID: <0835B3720019904CB8F7AA43166CEEB2F18D04FF@RTITMBSVM03.realtek.com.tw>
Date:   Wed, 7 Aug 2019 04:34:24 +0000
From:   Hayes Wang <hayeswang@...ltek.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        nic_swsd <nic_swsd@...ltek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH net-next 4/5] r8152: support skb_add_rx_frag

Jakub Kicinski [mailto:jakub.kicinski@...ronome.com]
> Sent: Wednesday, August 07, 2019 6:08 AM
[...]
> >  #define RTL8152_REQT_READ	0xc0
> > @@ -720,7 +723,7 @@ struct r8152 {
> >  	struct net_device *netdev;
> >  	struct urb *intr_urb;
> >  	struct tx_agg tx_info[RTL8152_MAX_TX];
> > -	struct list_head rx_info;
> > +	struct list_head rx_info, rx_used;
> 
> I don't see where entries on the rx_used list get freed when driver is
> unloaded, could you explain how that's taken care of?

When the driver is unloaded, all rx_agg would be freed from
info_list list.

The info_list includes all rx_agg buffers which may be idle
or be busy. The rx_done and rx_use are used to determine
the status of rx_agg buffer included in info_list.

info_list: the rx_agg buffer would be inserted in this list
	   when it is allocated.
rx_done: the rx_agg buffer is ready (contains rx data). Or
	 it needs to be resubmitted.
rx_use: the rx_agg buffer is busy and couldn't be submitted
	yet.


Best Regards,
Hayes