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RE: [PATCH net-next 01/10] hv_netvsc: Resize some of the variables in hv_netvsc_packet

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> -----Original Message-----
> From: Vitaly Kuznetsov [mailto:vkuznets@redhat.com]
> Sent: Tuesday, November 24, 2015 12:48 AM
> To: KY Srinivasan <kys@microsoft.com>
> Cc: davem@davemloft.net; netdev@vger.kernel.org; linux-
> kernel@vger.kernel.org; devel@linuxdriverproject.org; olaf@aepfle.de;
> apw@canonical.com; jasowang@redhat.com
> Subject: Re: [PATCH net-next 01/10] hv_netvsc: Resize some of the variables
> in hv_netvsc_packet
> 
> "K. Y. Srinivasan" <kys@microsoft.com> writes:
> 
> > As part of reducing the size of the hv_netvsc_packet, resize some of the
> > variables based on their usage.
> >
> > Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
> > Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
> > ---
> >  drivers/net/hyperv/hyperv_net.h |   14 +++++++-------
> >  1 files changed, 7 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/net/hyperv/hyperv_net.h
> b/drivers/net/hyperv/hyperv_net.h
> > index 5fa98f5..972e562 100644
> > --- a/drivers/net/hyperv/hyperv_net.h
> > +++ b/drivers/net/hyperv/hyperv_net.h
> > @@ -127,11 +127,11 @@ struct ndis_tcp_ip_checksum_info;
> >   */
> >  struct hv_netvsc_packet {
> >  	/* Bookkeeping stuff */
> > -	u32 status;
> > +	u8 status;
> >
> > -	bool is_data_pkt;
> > -	bool xmit_more; /* from skb */
> > -	bool cp_partial; /* partial copy into send buffer */
> > +	u8 is_data_pkt;
> > +	u8 xmit_more; /* from skb */
> > +	u8 cp_partial; /* partial copy into send buffer */
> 
> These are flags so we can make them bitfields and save even more space.

I am not done with restructuring this structure yet. Once I get this to the bare minimum
I will look at using bitfields. 

K. Y
> 
> >
> >  	u16 vlan_tci;
> >
> > @@ -147,13 +147,13 @@ struct hv_netvsc_packet {
> >  	/* This points to the memory after page_buf */
> >  	struct rndis_message *rndis_msg;
> >
> > -	u32 rmsg_size; /* RNDIS header and PPI size */
> > -	u32 rmsg_pgcnt; /* page count of RNDIS header and PPI */
> > +	u8 rmsg_size; /* RNDIS header and PPI size */
> > +	u8 rmsg_pgcnt; /* page count of RNDIS header and PPI */
> >
> >  	u32 total_data_buflen;
> >  	/* Points to the send/receive buffer where the ethernet frame is */
> >  	void *data;
> > -	u32 page_buf_cnt;
> > +	u8 page_buf_cnt;
> >  	struct hv_page_buffer *page_buf;
> >  };
> 
> --
>   Vitaly
--
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[PATCH net-next 00/10] hv_netvsc: Eliminate the additional head room  "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-23 23:00 +0100
  [PATCH net-next 02/10] hv_netvsc: Rearrange the hv_negtvsc_packet to be space efficient "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-23 23:00 +0100
  [PATCH net-next 01/10] hv_netvsc: Resize some of the variables in hv_netvsc_packet "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-23 23:00 +0100
    [PATCH net-next 06/10] hv_netvsc: Eliminate send_completion from struct hv_netvsc_packet "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-23 23:00 +0100
    [PATCH net-next 10/10] hv_netvsc: remove locking in netvsc_send() "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-23 23:00 +0100
    [PATCH net-next 07/10] hv_netvsc: Eliminate send_completion_ctx from struct hv_netvsc_packet "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-23 23:00 +0100
    [PATCH net-next 05/10] hv_netvsc: Eliminatte the data field from struct hv_netvsc_packet "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-23 23:00 +0100
    [PATCH net-next 08/10] hv_netvsc: Don't ask for additional head room in the skb "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-23 23:10 +0100
      Re: [PATCH net-next 08/10] hv_netvsc: Don't ask for additional head room in the skb Vitaly Kuznetsov <vkuznets@redhat.com> - 2015-11-24 10:00 +0100
        RE: [PATCH net-next 08/10] hv_netvsc: Don't ask for additional head  room in the skb KY Srinivasan <kys@microsoft.com> - 2015-11-24 17:30 +0100
      Re: [PATCH net-next 08/10] hv_netvsc: Don't ask for additional head  room in the skb Florian Westphal <fw@strlen.de> - 2015-11-24 10:00 +0100
        RE: [PATCH net-next 08/10] hv_netvsc: Don't ask for additional head  room in the skb KY Srinivasan <kys@microsoft.com> - 2015-11-24 17:50 +0100
    [PATCH net-next 03/10] hv_netvsc: Eliminate the channel field in hv_netvsc_packet structure "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-23 23:10 +0100
    [PATCH net-next 04/10] hv_netvsc: Eliminate rndis_msg pointer from hv_netvsc_packet structure "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-23 23:10 +0100
    Re: [PATCH net-next 01/10] hv_netvsc: Resize some of the variables in hv_netvsc_packet Vitaly Kuznetsov <vkuznets@redhat.com> - 2015-11-24 09:50 +0100
      RE: [PATCH net-next 01/10] hv_netvsc: Resize some of the variables in  hv_netvsc_packet KY Srinivasan <kys@microsoft.com> - 2015-11-24 17:50 +0100

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