netdev - Re: [PATCH net-next v4 2/2] gve: Handle alternate miss completions

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Date:   Thu, 17 Nov 2022 13:12:20 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jeroen de Borst <jeroendb@...gle.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        jesse.brandeburg@...el.com
Subject: Re: [PATCH net-next v4 2/2] gve: Handle alternate miss completions

On Wed, Nov 16, 2022 at 10:17:25AM -0800, Jeroen de Borst wrote:
> The virtual NIC has 2 ways of indicating a miss-path
> completion. This handles the alternate.
> 
> Signed-off-by: Jeroen de Borst <jeroendb@...gle.com>
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> ---
>  drivers/net/ethernet/google/gve/gve_adminq.h   |  4 +++-
>  drivers/net/ethernet/google/gve/gve_desc_dqo.h |  5 +++++
>  drivers/net/ethernet/google/gve/gve_tx_dqo.c   | 18 ++++++++++++------
>  3 files changed, 20 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/google/gve/gve_adminq.h b/drivers/net/ethernet/google/gve/gve_adminq.h
> index b9ee8be73f96..cf29662e6ad1 100644
> --- a/drivers/net/ethernet/google/gve/gve_adminq.h
> +++ b/drivers/net/ethernet/google/gve/gve_adminq.h
> @@ -154,6 +154,7 @@ enum gve_driver_capbility {
>  	gve_driver_capability_gqi_rda = 1,
>  	gve_driver_capability_dqo_qpl = 2, /* reserved for future use */
>  	gve_driver_capability_dqo_rda = 3,
> +	gve_driver_capability_alt_miss_compl = 4,
>  };
>  
>  #define GVE_CAP1(a) BIT((int)a)
> @@ -164,7 +165,8 @@ enum gve_driver_capbility {
>  #define GVE_DRIVER_CAPABILITY_FLAGS1 \
>  	(GVE_CAP1(gve_driver_capability_gqi_qpl) | \
>  	 GVE_CAP1(gve_driver_capability_gqi_rda) | \
> -	 GVE_CAP1(gve_driver_capability_dqo_rda))
> +	 GVE_CAP1(gve_driver_capability_dqo_rda) | \
> +	 GVE_CAP1(gve_driver_capability_alt_miss_compl))
>  
>  #define GVE_DRIVER_CAPABILITY_FLAGS2 0x0
>  #define GVE_DRIVER_CAPABILITY_FLAGS3 0x0
> diff --git a/drivers/net/ethernet/google/gve/gve_desc_dqo.h b/drivers/net/ethernet/google/gve/gve_desc_dqo.h
> index e8fe9adef7f2..f79cd0591110 100644
> --- a/drivers/net/ethernet/google/gve/gve_desc_dqo.h
> +++ b/drivers/net/ethernet/google/gve/gve_desc_dqo.h
> @@ -176,6 +176,11 @@ static_assert(sizeof(struct gve_tx_compl_desc) == 8);
>  #define GVE_COMPL_TYPE_DQO_MISS 0x1 /* Miss path completion */
>  #define GVE_COMPL_TYPE_DQO_REINJECTION 0x3 /* Re-injection completion */
>  
> +/* The most significant bit in the completion tag can change the completion
> + * type from packet completion to miss path completion.
> + */
> +#define GVE_ALT_MISS_COMPL_BIT BIT(15)
> +
>  /* Descriptor to post buffers to HW on buffer queue. */
>  struct gve_rx_desc_dqo {
>  	__le16 buf_id; /* ID returned in Rx completion descriptor */
> diff --git a/drivers/net/ethernet/google/gve/gve_tx_dqo.c b/drivers/net/ethernet/google/gve/gve_tx_dqo.c
> index 588d64819ed5..762915c6063b 100644
> --- a/drivers/net/ethernet/google/gve/gve_tx_dqo.c
> +++ b/drivers/net/ethernet/google/gve/gve_tx_dqo.c
> @@ -953,12 +953,18 @@ int gve_clean_tx_done_dqo(struct gve_priv *priv, struct gve_tx_ring *tx,
>  			atomic_set_release(&tx->dqo_compl.hw_tx_head, tx_head);
>  		} else if (type == GVE_COMPL_TYPE_DQO_PKT) {
>  			u16 compl_tag = le16_to_cpu(compl_desc->completion_tag);
> -
> -			gve_handle_packet_completion(priv, tx, !!napi,
> -						     compl_tag,
> -						     &pkt_compl_bytes,
> -						     &pkt_compl_pkts,
> -						     /*is_reinjection=*/false);
> +			if (compl_tag & GVE_ALT_MISS_COMPL_BIT) {
> +				compl_tag &= ~GVE_ALT_MISS_COMPL_BIT;
> +				gve_handle_miss_completion(priv, tx, compl_tag,
> +							   &miss_compl_bytes,
> +							   &miss_compl_pkts);
> +			} else {
> +				gve_handle_packet_completion(priv, tx, !!napi,
> +							     compl_tag,
> +							     &pkt_compl_bytes,
> +							     &pkt_compl_pkts,
> +							     /*is_reinjection=*/false);

Please don't add commented code in the function calls.

Thanks

> +			}
>  		} else if (type == GVE_COMPL_TYPE_DQO_MISS) {
>  			u16 compl_tag = le16_to_cpu(compl_desc->completion_tag);
>  
> -- 
> 2.38.1.431.g37b22c650d-goog
>