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From: "Bhandare, KiranX" <kiranx.bhandare@intel.com>
To: "Fijalkowski, Maciej" <maciej.fijalkowski@intel.com>,
	"intel-wired-lan@lists.osuosl.org"
	<intel-wired-lan@lists.osuosl.org>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"brouer@redhat.com" <brouer@redhat.com>,
	"kuba@kernel.org" <kuba@kernel.org>,
	"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
	"Topel, Bjorn" <bjorn.topel@intel.com>,
	"Karlsson, Magnus" <magnus.karlsson@intel.com>
Subject: RE: [Intel-wired-lan] [PATCH intel-net 1/3] i40e: move headroom initialization to i40e_configure_rx_ring
Date: Tue, 9 Mar 2021 14:04:04 +0000	[thread overview]
Message-ID: <DM6PR11MB32923242A018780B50182999F1929@DM6PR11MB3292.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20210303153928.11764-2-maciej.fijalkowski@intel.com>

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Maciej Fijalkowski
> Sent: Wednesday, March 3, 2021 9:09 PM
> To: intel-wired-lan@lists.osuosl.org
> Cc: netdev@vger.kernel.org; brouer@redhat.com; kuba@kernel.org;
> bpf@vger.kernel.org; Topel, Bjorn <bjorn.topel@intel.com>; Karlsson,
> Magnus <magnus.karlsson@intel.com>
> Subject: [Intel-wired-lan] [PATCH intel-net 1/3] i40e: move headroom
> initialization to i40e_configure_rx_ring
> 
> i40e_rx_offset(), that is supposed to initialize the Rx buffer headroom, relies
> on I40E_RXR_FLAGS_BUILD_SKB_ENABLED flag.
> 
> Currently, the callsite of mentioned function is placed incorrectly within
> i40e_setup_rx_descriptors() where Rx ring's build skb flag is not set yet. This
> causes the XDP_REDIRECT to be partially broken due to inability to create
> xdp_frame in the headroom space, as the headroom is 0.
> 
> For the record, below is the call graph:
> 
> i40e_vsi_open
>  i40e_vsi_setup_rx_resources
>   i40e_setup_rx_descriptors
>    i40e_rx_offset() <-- sets offset to 0 as build_skb flag is set below
> 
>  i40e_vsi_configure_rx
>   i40e_configure_rx_ring
>    set_ring_build_skb_enabled(ring) <-- set build_skb flag
> 
> Fix this by moving i40e_rx_offset() to i40e_configure_rx_ring() after the flag
> setting.
> 
> Fixes: f7bb0d71d658 ("i40e: store the result of i40e_rx_offset() onto
> i40e_ring")
> Reported-by: Jesper Dangaard Brouer <brouer@redhat.com>
> Co-developed-by: Jesper Dangaard Brouer <brouer@redhat.com>
> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_main.c | 13 +++++++++++++
> drivers/net/ethernet/intel/i40e/i40e_txrx.c | 12 ------------
>  2 files changed, 13 insertions(+), 12 deletions(-)
> 

Tested-by: Kiran Bhandare <kiranx.bhandare@intel.com>  A Contingent Worker at Intel

  parent reply	other threads:[~2021-03-09 14:05 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-03 15:39 [PATCH intel-net 0/3] intel: Rx headroom fixes Maciej Fijalkowski
2021-03-03 15:39 ` [PATCH intel-net 1/3] i40e: move headroom initialization to i40e_configure_rx_ring Maciej Fijalkowski
2021-03-04  8:53   ` Jesper Dangaard Brouer
2021-03-09 14:04   ` Bhandare, KiranX [this message]
2021-03-03 15:39 ` [PATCH intel-net 2/3] ice: move headroom initialization to ice_setup_rx_ctx Maciej Fijalkowski
2021-03-09 14:02   ` [Intel-wired-lan] " Bhandare, KiranX
2021-03-03 15:39 ` [PATCH intel-net 3/3] ixgbe: move headroom initialization to ixgbe_configure_rx_ring Maciej Fijalkowski
2021-03-09 16:27   ` [Intel-wired-lan] " Jambekar, Vishakha
2021-03-03 18:36 ` [Intel-wired-lan] [PATCH intel-net 0/3] intel: Rx headroom fixes Jesse Brandeburg

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