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Date: Wed, 3 Feb 2016 14:49:46 -0700
From: Shuah Khan <shuahkh@....samsung.com>
To: Jεan Sacren <sakiwit@...il.com>,
davem@...emloft.net
Cc: netdev@...r.kernel.org, shuahkhan@...il.com, julia.lawall@...6.fr,
Byungho An <bh74.an@...sung.com>,
Girish K S <ks.giri@...sung.com>,
Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH net-next] sxgbe: remove unused code
On 02/03/2016 01:11 PM, Jεan Sacren wrote:
> From: Jean Sacren <sakiwit@...il.com>
>
> With the introduction of this commit 1edb9ca69e8a
> ("net: sxgbe: add basic framework for Samsung 10Gb ethernet driver"),
> the following interface was added:
>
> int sxgbe_xpcs_init(struct net_device *ndev);
> int sxgbe_xpcs_init_1G(struct net_device *ndev);
>
> But those two functions have never been used since the inception.
>
> In addition to the interface, the following macros are defined in
> sxgbe_xpcs header but not used:
>
> SR_MII_MMD_AN_ADV
> SR_MII_MMD_AN_LINK_PARTNER_BA
> VR_MII_MMD_AN_CONTROL
> VR_MII_MMD_AN_INT_STATUS
> XPCS_TYPE_SEL_R
> XPCS_TYPE_SEL_W
> XPCS_RXAUI_MODE
>
> If we remove the interface, functions it uses and all other macros
> defined in sxgbe_xpcs header will also become useless. Thus, the whole
> sxgbe_xpcs shebang should be all gone.
>
> Julia Lawall observed:
>
> "... I was looking at dependencies between networking files. This one
> stands out because nothing is dependent[ ]on it, even the files it is
> compiled with, and it doesn't contain the usual functions,
> register_netdev, etc."
>
> David Miller commented:
>
> "There are no in-tree callers of this code. It should be removed until
> there are in-tree users.
>
> Nobody can figure out if the interface for this is done properly without
> seeing the call sites and how they work. It is therefore impossible to
> review this code and judge it[']s design."
>
> Let's remove this unused code. As a matter of fact, it should not have
> been merged in the first place.
ok - I don't think all of this belongs in the change log.
You can just say - "removing unused code" include a link
a to the discussion - could also add Suggested-by tag for
David Miller
thanks,
-- Shuah
>
> Reported-by: Julia Lawall <julia.lawall@...6.fr>
> Signed-off-by: Jean Sacren <sakiwit@...il.com>
> Cc: Byungho An <bh74.an@...sung.com>
> Cc: Girish K S <ks.giri@...sung.com>
> ---
> We may use "--ignore FILE_PATH_CHANGES" to suppress checkpatch warning.
>
> drivers/net/ethernet/samsung/sxgbe/Makefile | 2 +-
> drivers/net/ethernet/samsung/sxgbe/sxgbe_xpcs.c | 91 -------------------------
> drivers/net/ethernet/samsung/sxgbe/sxgbe_xpcs.h | 38 -----------
> 3 files changed, 1 insertion(+), 130 deletions(-)
> delete mode 100644 drivers/net/ethernet/samsung/sxgbe/sxgbe_xpcs.c
> delete mode 100644 drivers/net/ethernet/samsung/sxgbe/sxgbe_xpcs.h
>
> diff --git a/drivers/net/ethernet/samsung/sxgbe/Makefile b/drivers/net/ethernet/samsung/sxgbe/Makefile
> index dcc80b9d4370..31e968561d5c 100644
> --- a/drivers/net/ethernet/samsung/sxgbe/Makefile
> +++ b/drivers/net/ethernet/samsung/sxgbe/Makefile
> @@ -1,4 +1,4 @@
> obj-$(CONFIG_SXGBE_ETH) += samsung-sxgbe.o
> samsung-sxgbe-objs:= sxgbe_platform.o sxgbe_main.o sxgbe_desc.o \
> sxgbe_dma.o sxgbe_core.o sxgbe_mtl.o sxgbe_mdio.o \
> - sxgbe_ethtool.o sxgbe_xpcs.o $(samsung-sxgbe-y)
> + sxgbe_ethtool.o $(samsung-sxgbe-y)
> diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_xpcs.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_xpcs.c
> deleted file mode 100644
> index 51c32194ba88..000000000000
> --- a/drivers/net/ethernet/samsung/sxgbe/sxgbe_xpcs.c
> +++ /dev/null
> @@ -1,91 +0,0 @@
> -/* 10G controller driver for Samsung SoCs
> - *
> - * Copyright (C) 2013 Samsung Electronics Co., Ltd.
> - * http://www.samsung.com
> - *
> - * Author: Siva Reddy Kallam <siva.kallam@...sung.com>
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License version 2 as
> - * published by the Free Software Foundation.
> - */
> -#include <linux/bitops.h>
> -#include <linux/kernel.h>
> -#include <linux/netdevice.h>
> -#include <linux/phy.h>
> -#include "sxgbe_common.h"
> -#include "sxgbe_xpcs.h"
> -
> -static int sxgbe_xpcs_read(struct net_device *ndev, unsigned int reg)
> -{
> - u32 value;
> - struct sxgbe_priv_data *priv = netdev_priv(ndev);
> -
> - value = readl(priv->ioaddr + XPCS_OFFSET + reg);
> -
> - return value;
> -}
> -
> -static int sxgbe_xpcs_write(struct net_device *ndev, int reg, int data)
> -{
> - struct sxgbe_priv_data *priv = netdev_priv(ndev);
> -
> - writel(data, priv->ioaddr + XPCS_OFFSET + reg);
> -
> - return 0;
> -}
> -
> -int sxgbe_xpcs_init(struct net_device *ndev)
> -{
> - u32 value;
> -
> - value = sxgbe_xpcs_read(ndev, SR_PCS_MMD_CONTROL1);
> - /* 10G XAUI mode */
> - sxgbe_xpcs_write(ndev, SR_PCS_CONTROL2, XPCS_TYPE_SEL_X);
> - sxgbe_xpcs_write(ndev, VR_PCS_MMD_XAUI_MODE_CONTROL, XPCS_XAUI_MODE);
> - sxgbe_xpcs_write(ndev, VR_PCS_MMD_XAUI_MODE_CONTROL, value | BIT(13));
> - sxgbe_xpcs_write(ndev, SR_PCS_MMD_CONTROL1, value | BIT(11));
> -
> - do {
> - value = sxgbe_xpcs_read(ndev, VR_PCS_MMD_DIGITAL_STATUS);
> - } while ((value & XPCS_QSEQ_STATE_MPLLOFF) == XPCS_QSEQ_STATE_STABLE);
> -
> - value = sxgbe_xpcs_read(ndev, SR_PCS_MMD_CONTROL1);
> - sxgbe_xpcs_write(ndev, SR_PCS_MMD_CONTROL1, value & ~BIT(11));
> -
> - do {
> - value = sxgbe_xpcs_read(ndev, VR_PCS_MMD_DIGITAL_STATUS);
> - } while ((value & XPCS_QSEQ_STATE_MPLLOFF) != XPCS_QSEQ_STATE_STABLE);
> -
> - return 0;
> -}
> -
> -int sxgbe_xpcs_init_1G(struct net_device *ndev)
> -{
> - int value;
> -
> - /* 10GBASE-X PCS (1G) mode */
> - sxgbe_xpcs_write(ndev, SR_PCS_CONTROL2, XPCS_TYPE_SEL_X);
> - sxgbe_xpcs_write(ndev, VR_PCS_MMD_XAUI_MODE_CONTROL, XPCS_XAUI_MODE);
> - value = sxgbe_xpcs_read(ndev, SR_PCS_MMD_CONTROL1);
> - sxgbe_xpcs_write(ndev, SR_PCS_MMD_CONTROL1, value & ~BIT(13));
> -
> - value = sxgbe_xpcs_read(ndev, SR_MII_MMD_CONTROL);
> - sxgbe_xpcs_write(ndev, SR_MII_MMD_CONTROL, value | BIT(6));
> - sxgbe_xpcs_write(ndev, SR_MII_MMD_CONTROL, value & ~BIT(13));
> - value = sxgbe_xpcs_read(ndev, SR_PCS_MMD_CONTROL1);
> - sxgbe_xpcs_write(ndev, SR_PCS_MMD_CONTROL1, value | BIT(11));
> -
> - do {
> - value = sxgbe_xpcs_read(ndev, VR_PCS_MMD_DIGITAL_STATUS);
> - } while ((value & XPCS_QSEQ_STATE_MPLLOFF) != XPCS_QSEQ_STATE_STABLE);
> -
> - value = sxgbe_xpcs_read(ndev, SR_PCS_MMD_CONTROL1);
> - sxgbe_xpcs_write(ndev, SR_PCS_MMD_CONTROL1, value & ~BIT(11));
> -
> - /* Auto Negotiation cluase 37 enable */
> - value = sxgbe_xpcs_read(ndev, SR_MII_MMD_CONTROL);
> - sxgbe_xpcs_write(ndev, SR_MII_MMD_CONTROL, value | BIT(12));
> -
> - return 0;
> -}
> diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_xpcs.h b/drivers/net/ethernet/samsung/sxgbe/sxgbe_xpcs.h
> deleted file mode 100644
> index 6b26a50724d3..000000000000
> --- a/drivers/net/ethernet/samsung/sxgbe/sxgbe_xpcs.h
> +++ /dev/null
> @@ -1,38 +0,0 @@
> -/* 10G controller driver for Samsung SoCs
> - *
> - * Copyright (C) 2013 Samsung Electronics Co., Ltd.
> - * http://www.samsung.com
> - *
> - * Author: Byungho An <bh74.an@...sung.com>
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License version 2 as
> - * published by the Free Software Foundation.
> - */
> -#ifndef __SXGBE_XPCS_H__
> -#define __SXGBE_XPCS_H__
> -
> -/* XPCS Registers */
> -#define XPCS_OFFSET 0x1A060000
> -#define SR_PCS_MMD_CONTROL1 0x030000
> -#define SR_PCS_CONTROL2 0x030007
> -#define VR_PCS_MMD_XAUI_MODE_CONTROL 0x038004
> -#define VR_PCS_MMD_DIGITAL_STATUS 0x038010
> -#define SR_MII_MMD_CONTROL 0x1F0000
> -#define SR_MII_MMD_AN_ADV 0x1F0004
> -#define SR_MII_MMD_AN_LINK_PARTNER_BA 0x1F0005
> -#define VR_MII_MMD_AN_CONTROL 0x1F8001
> -#define VR_MII_MMD_AN_INT_STATUS 0x1F8002
> -
> -#define XPCS_QSEQ_STATE_STABLE 0x10
> -#define XPCS_QSEQ_STATE_MPLLOFF 0x1c
> -#define XPCS_TYPE_SEL_R 0x00
> -#define XPCS_TYPE_SEL_X 0x01
> -#define XPCS_TYPE_SEL_W 0x02
> -#define XPCS_XAUI_MODE 0x00
> -#define XPCS_RXAUI_MODE 0x01
> -
> -int sxgbe_xpcs_init(struct net_device *ndev);
> -int sxgbe_xpcs_init_1G(struct net_device *ndev);
> -
> -#endif /* __SXGBE_XPCS_H__ */
>
--
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@....samsung.com | (970) 217-8978
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