netdev - Re: [PATCH net v2 3/3] ice: avoid premature Rx buffer reuse

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Date:   Tue, 25 Aug 2020 08:49:59 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Björn Töpel <bjorn.topel@...il.com>
Cc:     jeffrey.t.kirsher@...el.com, intel-wired-lan@...ts.osuosl.org,
        Björn Töpel <bjorn.topel@...el.com>,
        magnus.karlsson@...el.com, magnus.karlsson@...il.com,
        netdev@...r.kernel.org, maciej.fijalkowski@...el.com,
        piotr.raczynski@...el.com, maciej.machnikowski@...el.com,
        lirongqing@...du.com
Subject: Re: [PATCH net v2 3/3] ice: avoid premature Rx buffer reuse

On Tue, 25 Aug 2020 14:13:23 +0200 Björn Töpel wrote:
> From: Björn Töpel <bjorn.topel@...el.com>
> 
> The page recycle code, incorrectly, relied on that a page fragment
> could not be freed inside xdp_do_redirect(). This assumption leads to
> that page fragments that are used by the stack/XDP redirect can be
> reused and overwritten.
> 
> To avoid this, store the page count prior invoking xdp_do_redirect().
> 
> Fixes: efc2214b6047 ("ice: Add support for XDP")
> Reported-and-analyzed-by: Li RongQing <lirongqing@...du.com>
> Signed-off-by: Björn Töpel <bjorn.topel@...el.com>

Gotta adjust the kdoc:

drivers/net/ethernet/intel/ice/ice_txrx.c:773: warning: Function parameter or member 'rx_buf_pgcnt' not described in 'ice_can_reuse_rx_page'
drivers/net/ethernet/intel/ice/ice_txrx.c:885: warning: Function parameter or member 'rx_buf_pgcnt' not described in 'ice_get_rx_buf'
drivers/net/ethernet/intel/ice/ice_txrx.c:1033: warning: Function parameter or member 'rx_buf_pgcnt' not described in 'ice_put_rx_buf'