netdev - Re: [PATCH net] ice: always add legacy 32byte RXDID in supported

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Message-ID: <3ad2807a-727e-cdac-482b-acde2405304d@intel.com>
Date: Wed, 20 Sep 2023 16:08:49 +0200
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Michal Schmidt <mschmidt@...hat.com>, <intel-wired-lan@...ts.osuosl.org>
CC: Jacob Keller <jacob.e.keller@...el.com>, Leyi Rong <leyi.rong@...el.com>,
	Michal Jaron <michalx.jaron@...el.com>, Mateusz Palczewski
	<mateusz.palczewski@...el.com>, Paolo Abeni <pabeni@...hat.com>,
	<netdev@...r.kernel.org>
Subject: Re: [PATCH net] ice: always add legacy 32byte RXDID in
 supported_rxdids

On 9/20/23 13:54, Michal Schmidt wrote:
> When the PF and VF drivers both support flexible rx descriptors and have
> negotiated the VIRTCHNL_VF_OFFLOAD_RX_FLEX_DESC capability, the VF driver
> queries the PF for the list of supported descriptor formats
> (VIRTCHNL_OP_GET_SUPPORTED_RXDIDS). The PF driver is supposed to set the
> supported_rxdids bits that correspond to the descriptor formats the
> firmware implements. The legacy 32-byte rx desc format is always
> supported, even though it is not expressed in GLFLXP_RXDID_FLAGS.
> 
> The ice driver does not advertise the legacy 32-byte rx desc support,
> which leads to this failure to bring up the VF using the Intel
> out-of-tree iavf driver:
>   iavf 0000:41:01.0: PF does not list support for default Rx descriptor format
>   ...
>   iavf 0000:41:01.0: PF returned error -5 (VIRTCHNL_STATUS_ERR_PARAM) to our request 6
> 
> The in-tree iavf driver does not expose this bug, because it does not
> yet implement VIRTCHNL_VF_OFFLOAD_RX_FLEX_DESC.
> 
> The ice driver must always set the ICE_RXDID_LEGACY_1 bit in
> supported_rxdids. The Intel out-of-tree ice driver and the ice driver in
> DPDK both do this.
> 
> I copied this piece of the code and the comment text from the Intel
> out-of-tree driver.
> 
> Fixes: e753df8fbca5 ("ice: Add support Flex RXD")
> Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
> ---
>   drivers/net/ethernet/intel/ice/ice_virtchnl.c | 12 +++++++-----
>   1 file changed, 7 insertions(+), 5 deletions(-)

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>

We have tried to upstream that as part of some big series "recently",
with no luck so far, so thank for standalone submission!

> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl.c b/drivers/net/ethernet/intel/ice/ice_virtchnl.c
> index b03426ac932b..db97353efd06 100644
> --- a/drivers/net/ethernet/intel/ice/ice_virtchnl.c
> +++ b/drivers/net/ethernet/intel/ice/ice_virtchnl.c
> @@ -2617,12 +2617,14 @@ static int ice_vc_query_rxdid(struct ice_vf *vf)
>   		goto err;
>   	}
>   
> -	/* Read flexiflag registers to determine whether the
> -	 * corresponding RXDID is configured and supported or not.
> -	 * Since Legacy 16byte descriptor format is not supported,
> -	 * start from Legacy 32byte descriptor.
> +	/* RXDIDs supported by DDP package can be read from the register
> +	 * to get the supported RXDID bitmap. But the legacy 32byte RXDID
> +	 * is not listed in DDP package, add it in the bitmap manually.
> +	 * Legacy 16byte descriptor is not supported.
>   	 */
> -	for (i = ICE_RXDID_LEGACY_1; i < ICE_FLEX_DESC_RXDID_MAX_NUM; i++) {
> +	rxdid->supported_rxdids |= BIT(ICE_RXDID_LEGACY_1);
> +
> +	for (i = ICE_RXDID_FLEX_NIC; i < ICE_FLEX_DESC_RXDID_MAX_NUM; i++) {
>   		regval = rd32(hw, GLFLXP_RXDID_FLAGS(i, 0));
>   		if ((regval >> GLFLXP_RXDID_FLAGS_FLEXIFLAG_4N_S)
>   			& GLFLXP_RXDID_FLAGS_FLEXIFLAG_4N_M)