diff mbox series

[v5,bpf,06/11] ice: remove redundant xdp_rxq_info registration

Message ID 20240122221610.556746-7-maciej.fijalkowski@intel.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series net: bpf_xdp_adjust_tail() and Intel mbuf fixes | expand

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Commit Message

Maciej Fijalkowski Jan. 22, 2024, 10:16 p.m. UTC 
xdp_rxq_info struct can be registered by drivers via two functions -
xdp_rxq_info_reg() and __xdp_rxq_info_reg(). The latter one allows
drivers that support XDP multi-buffer to set up xdp_rxq_info::frag_size
which in turn will make it possible to grow the packet via
bpf_xdp_adjust_tail() BPF helper.

Currently, ice registers xdp_rxq_info in two spots:
1) ice_setup_rx_ring() // via xdp_rxq_info_reg(), BUG
2) ice_vsi_cfg_rxq()   // via __xdp_rxq_info_reg(), OK

Cited commit under fixes tag took care of setting up frag_size and
updated registration scheme in 2) but it did not help as
1) is called before 2) and as shown above it uses old registration
function. This means that 2) sees that xdp_rxq_info is already
registered and never calls __xdp_rxq_info_reg() which leaves us with
xdp_rxq_info::frag_size being set to 0.

To fix this misbehavior, simply remove xdp_rxq_info_reg() call from
ice_setup_rx_ring().

Fixes: 2fba7dc5157b ("ice: Add support for XDP multi-buffer on Rx side")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_txrx.c | 5 -----
 1 file changed, 5 deletions(-)

Comments

Magnus Karlsson Jan. 24, 2024, 8:39 a.m. UTC | #1 
On Mon, 22 Jan 2024 at 23:17, Maciej Fijalkowski
<maciej.fijalkowski@intel.com> wrote:
>
> xdp_rxq_info struct can be registered by drivers via two functions -
> xdp_rxq_info_reg() and __xdp_rxq_info_reg(). The latter one allows
> drivers that support XDP multi-buffer to set up xdp_rxq_info::frag_size
> which in turn will make it possible to grow the packet via
> bpf_xdp_adjust_tail() BPF helper.
>
> Currently, ice registers xdp_rxq_info in two spots:
> 1) ice_setup_rx_ring() // via xdp_rxq_info_reg(), BUG
> 2) ice_vsi_cfg_rxq()   // via __xdp_rxq_info_reg(), OK
>
> Cited commit under fixes tag took care of setting up frag_size and
> updated registration scheme in 2) but it did not help as
> 1) is called before 2) and as shown above it uses old registration
> function. This means that 2) sees that xdp_rxq_info is already
> registered and never calls __xdp_rxq_info_reg() which leaves us with
> xdp_rxq_info::frag_size being set to 0.
>
> To fix this misbehavior, simply remove xdp_rxq_info_reg() call from
> ice_setup_rx_ring().

Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>

> Fixes: 2fba7dc5157b ("ice: Add support for XDP multi-buffer on Rx side")
> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_txrx.c | 5 -----
>  1 file changed, 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
> index 1760e81379cc..765aea630a1f 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
> @@ -513,11 +513,6 @@ int ice_setup_rx_ring(struct ice_rx_ring *rx_ring)
>         if (ice_is_xdp_ena_vsi(rx_ring->vsi))
>                 WRITE_ONCE(rx_ring->xdp_prog, rx_ring->vsi->xdp_prog);
>
> -       if (rx_ring->vsi->type == ICE_VSI_PF &&
> -           !xdp_rxq_info_is_reg(&rx_ring->xdp_rxq))
> -               if (xdp_rxq_info_reg(&rx_ring->xdp_rxq, rx_ring->netdev,
> -                                    rx_ring->q_index, rx_ring->q_vector->napi.napi_id))
> -                       goto err;
>         return 0;
>
>  err:
> --
> 2.34.1
>
>
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index 1760e81379cc..765aea630a1f 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -513,11 +513,6 @@  int ice_setup_rx_ring(struct ice_rx_ring *rx_ring)
 	if (ice_is_xdp_ena_vsi(rx_ring->vsi))
 		WRITE_ONCE(rx_ring->xdp_prog, rx_ring->vsi->xdp_prog);
 
-	if (rx_ring->vsi->type == ICE_VSI_PF &&
-	    !xdp_rxq_info_is_reg(&rx_ring->xdp_rxq))
-		if (xdp_rxq_info_reg(&rx_ring->xdp_rxq, rx_ring->netdev,
-				     rx_ring->q_index, rx_ring->q_vector->napi.napi_id))
-			goto err;
 	return 0;
 
 err: