netdev - Re: [Intel-wired-lan] [PATCH RFC net-next v4 1/9] net: intel: introduce Intel Ethernet common library

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Date: Fri, 14 Jul 2023 16:17:56 +0200
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Alexander Lobakin <aleksander.lobakin@...el.com>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
CC: Paul Menzel <pmenzel@...gen.mpg.de>, Jesper Dangaard Brouer
	<hawk@...nel.org>, Larysa Zaremba <larysa.zaremba@...el.com>,
	<netdev@...r.kernel.org>, Alexander Duyck <alexanderduyck@...com>, "Ilias
 Apalodimas" <ilias.apalodimas@...aro.org>, <linux-kernel@...r.kernel.org>,
	Yunsheng Lin <linyunsheng@...wei.com>, Michal Kubiak
	<michal.kubiak@...el.com>, <intel-wired-lan@...ts.osuosl.org>, "David
 Christensen" <drc@...ux.vnet.ibm.com>
Subject: Re: [Intel-wired-lan] [PATCH RFC net-next v4 1/9] net: intel:
 introduce Intel Ethernet common library

On 7/5/23 17:55, Alexander Lobakin wrote:
> Not a secret there's a ton of code duplication between two and more Intel
> ethernet modules.
> Before introducing new changes, which would need to be copied over again,
> start decoupling the already existing duplicate functionality into a new
> module, which will be shared between several Intel Ethernet drivers.
> Add the lookup table which converts 8/10-bit hardware packet type into
> a parsed bitfield structure for easy checking packet format parameters,
> such as payload level, IP version, etc. This is currently used by i40e,
> ice and iavf and it's all the same in all three drivers.
> The only difference introduced in this implementation is that instead of
> defining a 256 (or 1024 in case of ice) element array, add unlikely()
> condition to limit the input to 154 (current maximum non-reserved packet
> type). There's no reason to waste 600 (or even 3600) bytes only to not
> hurt very unlikely exception packets.
> The hash computation function now takes payload level directly as a
> pkt_hash_type. There's a couple cases when non-IP ptypes are marked as
> L3 payload and in the previous versions their hash level would be 2, not
> 3. But skb_set_hash() only sees difference between L4 and non-L4, thus
> this won't change anything at all.
> The module is behind the hidden Kconfig symbol, which the drivers will
> select when needed. The exports are behind 'LIBIE' namespace to limit
> the scope of the functions.
> 
> Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
> ---
>   MAINTAINERS                                   |   3 +-
>   drivers/net/ethernet/intel/Kconfig            |  10 +
>   drivers/net/ethernet/intel/Makefile           |   1 +
>   drivers/net/ethernet/intel/i40e/i40e_common.c | 253 --------------
>   drivers/net/ethernet/intel/i40e/i40e_main.c   |   1 +
>   .../net/ethernet/intel/i40e/i40e_prototype.h  |   7 -
>   drivers/net/ethernet/intel/i40e/i40e_txrx.c   |  74 +---
>   drivers/net/ethernet/intel/i40e/i40e_type.h   |  88 -----
>   drivers/net/ethernet/intel/iavf/iavf_common.c | 253 --------------
>   drivers/net/ethernet/intel/iavf/iavf_main.c   |   1 +
>   .../net/ethernet/intel/iavf/iavf_prototype.h  |   7 -
>   drivers/net/ethernet/intel/iavf/iavf_txrx.c   |  70 +---
>   drivers/net/ethernet/intel/iavf/iavf_type.h   |  88 -----
>   .../net/ethernet/intel/ice/ice_lan_tx_rx.h    | 316 ------------------
>   drivers/net/ethernet/intel/ice/ice_main.c     |   1 +
>   drivers/net/ethernet/intel/ice/ice_txrx_lib.c |  74 +---
>   drivers/net/ethernet/intel/libie/Makefile     |   6 +
>   drivers/net/ethernet/intel/libie/rx.c         | 110 ++++++
>   include/linux/net/intel/libie/rx.h            | 128 +++++++
>   19 files changed, 312 insertions(+), 1179 deletions(-)
>   create mode 100644 drivers/net/ethernet/intel/libie/Makefile
>   create mode 100644 drivers/net/ethernet/intel/libie/rx.c
>   create mode 100644 include/linux/net/intel/libie/rx.h


Thanks a lot for whole effort on this series, it's refreshing to see a 
move in that direction.

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>