linux-kernel - Re: [PATCH net-next] Add support for netvsc build without CONFIG

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Date:	Thu, 8 May 2014 02:13:04 -0700
From:	Greg KH <greg@...ah.com>
To:	Haiyang Zhang <haiyangz@...rosoft.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, olaf@...fle.de,
	jasowang@...hat.com, driverdev-devel@...uxdriverproject.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] Add support for netvsc build without
 CONFIG_SYSFS flag

On Wed, May 07, 2014 at 03:45:04PM -0700, Haiyang Zhang wrote:
> This change ensures the driver can be built successfully without the
> CONFIG_SYSFS flag.
> MS-TFS: 182270
> 
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> Reviewed-by: K. Y. Srinivasan <kys@...rosoft.com>
> ---
>  drivers/net/hyperv/hyperv_net.h   |    2 ++
>  drivers/net/hyperv/netvsc_drv.c   |   12 +++++++++++-
>  drivers/net/hyperv/rndis_filter.c |    4 ++--
>  3 files changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
> index 4b7df5a..23b96bc 100644
> --- a/drivers/net/hyperv/hyperv_net.h
> +++ b/drivers/net/hyperv/hyperv_net.h
> @@ -87,6 +87,8 @@ struct ndis_recv_scale_cap { /* NDIS_RECEIVE_SCALE_CAPABILITIES */
>  #define HASH_KEYLEN NDIS_RSS_HASH_SECRET_KEY_MAX_SIZE_REVISION_2
>  extern u8 netvsc_hash_key[];
>  
> +extern unsigned int netvsc_num_queue;
> +
>  struct ndis_recv_scale_param { /* NDIS_RECEIVE_SCALE_PARAMETERS */
>  	struct ndis_obj_header hdr;
>  
> diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
> index 939e3af..07896f3 100644
> --- a/drivers/net/hyperv/netvsc_drv.c
> +++ b/drivers/net/hyperv/netvsc_drv.c
> @@ -52,6 +52,8 @@ static int ring_size = 128;
>  module_param(ring_size, int, S_IRUGO);
>  MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
>  
> +unsigned int netvsc_num_queue = 1;
> +
>  static void do_set_multicast(struct work_struct *w)
>  {
>  	struct net_device_context *ndevctx =
> @@ -639,9 +641,11 @@ int netvsc_recv_callback(struct hv_device *device_obj,
>  		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
>  				       packet->vlan_tci);
>  
> +#ifdef CONFIG_SYSFS
>  	skb_record_rx_queue(skb, packet->channel->
>  			    offermsg.offer.sub_channel_index %
>  			    net->real_num_rx_queues);
> +#endif

Why is this a sysfs-only function?  It should have nothing to do with
sysfs, right?  So why would the driver care?

Don't put #ifdef in drivers, it's unmaintainable over time, if this
really is a sysfs-only function, this should already be handled
automatically in a .h file somewhere.

thanks,

greg k-h
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