netdev - Re: [PATCH bpf-next v7 01/18] ice: make RX hash reading code more reusable

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Date: Thu, 16 Nov 2023 16:04:12 +0100
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Larysa Zaremba <larysa.zaremba@...el.com>
CC: <bpf@...r.kernel.org>, <ast@...nel.org>, <daniel@...earbox.net>,
	<andrii@...nel.org>, <martin.lau@...ux.dev>, <song@...nel.org>, <yhs@...com>,
	<john.fastabend@...il.com>, <kpsingh@...nel.org>, <sdf@...gle.com>,
	<haoluo@...gle.com>, <jolsa@...nel.org>, David Ahern <dsahern@...il.com>,
	Jakub Kicinski <kuba@...nel.org>, Willem de Bruijn <willemb@...gle.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>, Anatoly Burakov
	<anatoly.burakov@...el.com>, Alexander Lobakin <alexandr.lobakin@...el.com>,
	Magnus Karlsson <magnus.karlsson@...il.com>, Maryam Tahhan
	<mtahhan@...hat.com>, <xdp-hints@...-project.net>, <netdev@...r.kernel.org>,
	Willem de Bruijn <willemdebruijn.kernel@...il.com>, Alexei Starovoitov
	<alexei.starovoitov@...il.com>, Tariq Toukan <tariqt@...lanox.com>, "Saeed
 Mahameed" <saeedm@...lanox.com>
Subject: Re: [PATCH bpf-next v7 01/18] ice: make RX hash reading code more
 reusable

On Wed, Nov 15, 2023 at 06:52:43PM +0100, Larysa Zaremba wrote:
> Previously, we only needed RX hash in skb path,
> hence all related code was written with skb in mind.
> But with the addition of XDP hints via kfuncs to the ice driver,
> the same logic will be needed in .xmo_() callbacks.
> 
> Separate generic process of reading RX hash from a descriptor
> into a separate function.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>

> ---
>  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 36 +++++++++++++------
>  1 file changed, 25 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> index 7e06373e14d9..17530359aaf8 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> @@ -63,28 +63,42 @@ static enum pkt_hash_types ice_ptype_to_htype(u16 ptype)
>  }
>  
>  /**
> - * ice_rx_hash - set the hash value in the skb
> + * ice_get_rx_hash - get RX hash value from descriptor
> + * @rx_desc: specific descriptor
> + *
> + * Returns hash, if present, 0 otherwise.
> + */
> +static u32 ice_get_rx_hash(const union ice_32b_rx_flex_desc *rx_desc)
> +{
> +	const struct ice_32b_rx_flex_desc_nic *nic_mdid;
> +
> +	if (unlikely(rx_desc->wb.rxdid != ICE_RXDID_FLEX_NIC))
> +		return 0;
> +
> +	nic_mdid = (struct ice_32b_rx_flex_desc_nic *)rx_desc;
> +	return le32_to_cpu(nic_mdid->rss_hash);
> +}
> +
> +/**
> + * ice_rx_hash_to_skb - set the hash value in the skb
>   * @rx_ring: descriptor ring
>   * @rx_desc: specific descriptor
>   * @skb: pointer to current skb
>   * @rx_ptype: the ptype value from the descriptor
>   */
>  static void
> -ice_rx_hash(struct ice_rx_ring *rx_ring, union ice_32b_rx_flex_desc *rx_desc,
> -	    struct sk_buff *skb, u16 rx_ptype)
> +ice_rx_hash_to_skb(const struct ice_rx_ring *rx_ring,
> +		   const union ice_32b_rx_flex_desc *rx_desc,
> +		   struct sk_buff *skb, u16 rx_ptype)
>  {
> -	struct ice_32b_rx_flex_desc_nic *nic_mdid;
>  	u32 hash;
>  
>  	if (!(rx_ring->netdev->features & NETIF_F_RXHASH))
>  		return;
>  
> -	if (rx_desc->wb.rxdid != ICE_RXDID_FLEX_NIC)
> -		return;
> -
> -	nic_mdid = (struct ice_32b_rx_flex_desc_nic *)rx_desc;
> -	hash = le32_to_cpu(nic_mdid->rss_hash);
> -	skb_set_hash(skb, hash, ice_ptype_to_htype(rx_ptype));
> +	hash = ice_get_rx_hash(rx_desc);
> +	if (likely(hash))
> +		skb_set_hash(skb, hash, ice_ptype_to_htype(rx_ptype));
>  }
>  
>  /**
> @@ -186,7 +200,7 @@ ice_process_skb_fields(struct ice_rx_ring *rx_ring,
>  		       union ice_32b_rx_flex_desc *rx_desc,
>  		       struct sk_buff *skb, u16 ptype)
>  {
> -	ice_rx_hash(rx_ring, rx_desc, skb, ptype);
> +	ice_rx_hash_to_skb(rx_ring, rx_desc, skb, ptype);
>  
>  	/* modifies the skb - consumes the enet header */
>  	skb->protocol = eth_type_trans(skb, rx_ring->netdev);
> -- 
> 2.41.0
>