netdev - Re: [net-next PATCH v3 02/10] net: Add queue and napi association

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Date: Thu, 28 Sep 2023 12:47:38 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Amritha Nambiar <amritha.nambiar@...el.com>, netdev@...r.kernel.org, 
	kuba@...nel.org
Cc: sridhar.samudrala@...el.com
Subject: Re: [net-next PATCH v3 02/10] net: Add queue and napi association

On Tue, 2023-09-19 at 15:27 -0700, Amritha Nambiar wrote:
> Add the napi pointer in netdev queue for tracking the napi
> instance for each queue. This achieves the queue<->napi mapping.
> 
> Signed-off-by: Amritha Nambiar <amritha.nambiar@...el.com>
> Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
> ---
>  include/linux/netdevice.h     |    5 +++++
>  include/net/netdev_rx_queue.h |    2 ++
>  net/core/dev.c                |   34 ++++++++++++++++++++++++++++++++++
>  3 files changed, 41 insertions(+)
> 
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index db3d8429d50d..69e363918e4b 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -657,6 +657,8 @@ struct netdev_queue {
>  
>  	unsigned long		state;
>  
> +	/* NAPI instance for the queue */
> +	struct napi_struct      *napi;

This should be probably moved into the 'read-mostly' section, before
the '_xmit_lock' field, 

>  +/**
> + * netif_napi_add_queue - Associate queue with the napi
> + * @napi: NAPI context
> + * @queue_index: Index of queue
> + * @type: queue type as RX or TX
> + *
> + * Add queue with its corresponding napi context
> + */
> +int netif_napi_add_queue(struct napi_struct *napi, unsigned int queue_index,
> +			 enum netdev_queue_type type)

Very minor nit and others may have different opinion, but I feel like
this function name is misleading, since at this point both the rx and
tx queue should already exist. Perhaps 'netif_napi_link_queue' ?

Cheers,

Paolo