netdev - Re: [PATCH net-next 3/4] ice: use generic unrolled

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Message-ID: <Z6nxi9Ogdv0pxrQJ@boxer>
Date: Mon, 10 Feb 2025 13:31:07 +0100
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
CC: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Alexei Starovoitov
	<ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, John Fastabend
	<john.fastabend@...il.com>, Andrii Nakryiko <andrii@...nel.org>, "Jose E.
 Marchesi" <jose.marchesi@...cle.com>, Toke
 Høiland-Jørgensen <toke@...hat.com>, Magnus Karlsson
	<magnus.karlsson@...el.com>, Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Jason Baron <jbaron@...mai.com>, Casey Schaufler <casey@...aufler-ca.com>,
	Nathan Chancellor <nathan@...nel.org>, <bpf@...r.kernel.org>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 3/4] ice: use generic unrolled_count() macro

On Thu, Feb 06, 2025 at 07:26:28PM +0100, Alexander Lobakin wrote:
> ice, same as i40e, has a custom loop unrolling macros for unrolling
> Tx descriptors filling on XSk xmit.
> Replace ice defs with generic unrolled_count(), which is also more
> convenient as it allows passing defines as its argument, not hardcoded
> values, while the loop declaration will still be usual for-loop.
> 
> Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>

Acked-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>

> ---
>  drivers/net/ethernet/intel/ice/ice_xsk.h | 8 --------
>  drivers/net/ethernet/intel/ice/ice_xsk.c | 4 +++-
>  2 files changed, 3 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.h b/drivers/net/ethernet/intel/ice/ice_xsk.h
> index 45adeb513253..8dc5d55e26c5 100644
> --- a/drivers/net/ethernet/intel/ice/ice_xsk.h
> +++ b/drivers/net/ethernet/intel/ice/ice_xsk.h
> @@ -7,14 +7,6 @@
>  
>  #define PKTS_PER_BATCH 8
>  
> -#ifdef __clang__
> -#define loop_unrolled_for _Pragma("clang loop unroll_count(8)") for
> -#elif __GNUC__ >= 8
> -#define loop_unrolled_for _Pragma("GCC unroll 8") for
> -#else
> -#define loop_unrolled_for for
> -#endif
> -
>  struct ice_vsi;
>  
>  #ifdef CONFIG_XDP_SOCKETS
> diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
> index 8975d2971bc3..a3a4eaa17739 100644
> --- a/drivers/net/ethernet/intel/ice/ice_xsk.c
> +++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
> @@ -2,6 +2,7 @@
>  /* Copyright (c) 2019, Intel Corporation. */
>  
>  #include <linux/bpf_trace.h>
> +#include <linux/unroll.h>
>  #include <net/xdp_sock_drv.h>
>  #include <net/xdp.h>
>  #include "ice.h"
> @@ -989,7 +990,8 @@ static void ice_xmit_pkt_batch(struct ice_tx_ring *xdp_ring,
>  	struct ice_tx_desc *tx_desc;
>  	u32 i;
>  
> -	loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) {
> +	unrolled_count(PKTS_PER_BATCH)
> +	for (i = 0; i < PKTS_PER_BATCH; i++) {
>  		dma_addr_t dma;
>  
>  		dma = xsk_buff_raw_get_dma(xsk_pool, descs[i].addr);
> -- 
> 2.48.1
>