linux-kernel - Re: [PATCH] linux/dim: fix -Wunused-const-variable warnings

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Message-ID: <4749e75cd6f2045cfcdeb5cc9f8978ab1c036300.camel@mellanox.com>
Date:   Mon, 22 Jul 2019 21:10:16 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "cai@....pw" <cai@....pw>, Tal Gilboa <talgi@...lanox.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] linux/dim: fix -Wunused-const-variable warnings

On Mon, 2019-07-22 at 09:08 -0400, Qian Cai wrote:
> There are a lot of compilation warnings due to tx_profile[] and
> rx_profile[] are only used in lib/dim/net_dim.c but
> include/linux/dim.h
> is included elsewhere.
> 
> In file included from ./include/rdma/ib_verbs.h:64,
>                  from ./include/linux/mlx5/device.h:37,
>                  from ./include/linux/mlx5/driver.h:51,
>                  from
> drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c:37:
> ./include/linux/dim.h:326:1: warning: 'tx_profile' defined but not
> used
> [-Wunused-const-variable=]
>  tx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
>  ^~~~~~~~~~
> ./include/linux/dim.h:320:1: warning: 'rx_profile' defined but not
> used
> [-Wunused-const-variable=]
>  rx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
>  ^~~~~~~~~~
> 
> Fix them by moving tx_profile[] and rx_profile[] into
> lib/dim/net_dim.c
> instead.
> 
> Signed-off-by: Qian Cai <cai@....pw>
> ---
>  include/linux/dim.h | 12 ------------
>  lib/dim/net_dim.c   | 12 ++++++++++++
>  2 files changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/include/linux/dim.h b/include/linux/dim.h
> index d3a0fbfff2bb..d5f3b10fe6e1 100644
> --- a/include/linux/dim.h
> +++ b/include/linux/dim.h
> @@ -316,18 +316,6 @@ void dim_calc_stats(struct dim_sample *start,
> struct dim_sample *end,
>  	{64, 32}   \
>  }
>  
> -static const struct dim_cq_moder
> -rx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
> -	NET_DIM_RX_EQE_PROFILES,
> -	NET_DIM_RX_CQE_PROFILES,
> -};
> -
> -static const struct dim_cq_moder
> -tx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
> -	NET_DIM_TX_EQE_PROFILES,
> -	NET_DIM_TX_CQE_PROFILES,
> -};
> -
>  /**
>   *	net_dim_get_rx_moderation - provide a CQ moderation object for
> the given RX profile
>   *	@cq_period_mode: CQ period mode
> diff --git a/lib/dim/net_dim.c b/lib/dim/net_dim.c
> index 5bcc902c5388..f2a8674721cf 100644
> --- a/lib/dim/net_dim.c
> +++ b/lib/dim/net_dim.c
> @@ -5,6 +5,18 @@
>  
>  #include <linux/dim.h>
>  
> +static const struct dim_cq_moder
> +rx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
> +	NET_DIM_RX_EQE_PROFILES,
> +	NET_DIM_RX_CQE_PROFILES,
> +};
> +
> +static const struct dim_cq_moder
> +tx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
> +	NET_DIM_TX_EQE_PROFILES,
> +	NET_DIM_TX_CQE_PROFILES,
> +};
> +

Hi Qian,

it worth moving the structs and their dependencies, the whole below
code block should move to net_dim.c altogether.

/* Net DIM */

/*
 * Net DIM profiles:
 *        There are different set of profiles for each CQ period mode.
 *        There are different set of profiles for RX/TX CQs.
 *        Each profile size must be of NET_DIM_PARAMS_NUM_PROFILES
 */
#define NET_DIM_PARAMS_NUM_PROFILES 5
#define NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE 256
#define NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE 128
#define NET_DIM_DEF_PROFILE_CQE 1
#define NET_DIM_DEF_PROFILE_EQE 1

#define NET_DIM_RX_EQE_PROFILES { \
	{1,   NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
	{8,   NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
	{64,  NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
	{128, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
	{256, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
}

#define NET_DIM_RX_CQE_PROFILES { \
	{2,  256},             \
	{8,  128},             \
	{16, 64},              \
	{32, 64},              \
	{64, 64}               \
}

#define NET_DIM_TX_EQE_PROFILES { \
	{1,   NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE},  \
	{8,   NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE},  \
	{32,  NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE},  \
	{64,  NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE},  \
	{128, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}   \
}

#define NET_DIM_TX_CQE_PROFILES { \
	{5,  128},  \
	{8,  64},  \
	{16, 32},  \
	{32, 32},  \
	{64, 32}   \
}

static const struct dim_cq_moder
rx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
	NET_DIM_RX_EQE_PROFILES,
	NET_DIM_RX_CQE_PROFILES,
};

static const struct dim_cq_moder
tx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
	NET_DIM_TX_EQE_PROFILES,
	NET_DIM_TX_CQE_PROFILES,
};


in case you are going to submit a V2, can you cc netdev mailing list as
well ? 

>  struct dim_cq_moder
>  net_dim_get_rx_moderation(u8 cq_period_mode, int ix)
>  {