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Date: Wed, 24 Oct 2018 11:50:31 +0300
From: "Neftin, Sasha" <sasha.neftin@...el.com>
To: Jakub Kicinski <jakub.kicinski@...ronome.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org, nhorman@...hat.com,
sassmann@...hat.com, sasha.neftin@...el.com
Subject: Re: [net-next 01/11] igc: Add skeletal frame for Intel(R) 2.5G
Ethernet Controller support
On 10/18/2018 20:14, Jakub Kicinski wrote:
> On Wed, 17 Oct 2018 15:23:12 -0700, Jeff Kirsher wrote:
>> From: Sasha Neftin <sasha.neftin@...el.com>
>>
>> This patch adds the beginning framework onto which I am going to add
>> the igc driver which supports the Intel(R) I225-LM/I225-V 2.5G
>> Ethernet Controller.
>>
>> Signed-off-by: Sasha Neftin <sasha.neftin@...el.com>
>> Tested-by: Aaron Brown <aaron.f.brown@...el.com>
>> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
>
> bunch of minor nit picks
>
>> diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h
>> new file mode 100644
>> index 000000000000..afe595cfcf63
>> --- /dev/null
>> +++ b/drivers/net/ethernet/intel/igc/igc.h
>> @@ -0,0 +1,29 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/* Copyright (c) 2018 Intel Corporation */
>> +
>> +#ifndef _IGC_H_
>> +#define _IGC_H_
>> +
>> +#include <linux/kobject.h>
>> +
>> +#include <linux/pci.h>
>> +#include <linux/netdevice.h>
>> +#include <linux/vmalloc.h>
>> +
>> +#include <linux/ethtool.h>
>> +
>> +#include <linux/sctp.h>
>> +
>> +#define IGC_ERR(args...) pr_err("igc: " args)
>
> Looks like you're reimplementing pr_fmt()
>
yes, it is convenient for a debug. Same methodological approach I saw in
other drivers.
>> +#define PFX "igc: "
>> +
>> +#include <linux/timecounter.h>
>> +#include <linux/net_tstamp.h>
>> +#include <linux/ptp_clock_kernel.h>
>
> Splitting the includes looks fairly weird. Also, you're not using any
> of them here.
>
Good catch. I'll remove splits and unused "include"'s. All "include"'s
will be add per demand. I will send patch to fix that.
>> +/* main */
>> +extern char igc_driver_name[];
>> +extern char igc_driver_version[];
>> +
>> +#endif /* _IGC_H_ */
>> diff --git a/drivers/net/ethernet/intel/igc/igc_hw.h b/drivers/net/ethernet/intel/igc/igc_hw.h
>> new file mode 100644
>> index 000000000000..aa68b4516700
>> --- /dev/null
>> +++ b/drivers/net/ethernet/intel/igc/igc_hw.h
>> @@ -0,0 +1,10 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/* Copyright (c) 2018 Intel Corporation */
>> +
>> +#ifndef _IGC_HW_H_
>> +#define _IGC_HW_H_
>> +
>> +#define IGC_DEV_ID_I225_LM 0x15F2
>> +#define IGC_DEV_ID_I225_V 0x15F3
>> +
>> +#endif /* _IGC_HW_H_ */
>> diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
>> new file mode 100644
>> index 000000000000..753749ce5ae0
>> --- /dev/null
>> +++ b/drivers/net/ethernet/intel/igc/igc_main.c
>> @@ -0,0 +1,146 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/* Copyright (c) 2018 Intel Corporation */
>> +
>> +#include <linux/module.h>
>> +#include <linux/types.h>
>> +
>> +#include "igc.h"
>> +#include "igc_hw.h"
>> +
>> +#define DRV_VERSION "0.0.1-k"
>
> You can just use the kernel version, it works pretty well in presence
> of backports.
>
Good idea, I think I will do it too.
>> +#define DRV_SUMMARY "Intel(R) 2.5G Ethernet Linux Driver"
>> +
>> +MODULE_AUTHOR("Intel Corporation, <linux.nics@...el.com>");
>> +MODULE_DESCRIPTION(DRV_SUMMARY);
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_VERSION(DRV_VERSION);
>> +
>> +char igc_driver_name[] = "igc";
>> +char igc_driver_version[] = DRV_VERSION;
>> +static const char igc_driver_string[] = DRV_SUMMARY;
>> +static const char igc_copyright[] =
>> + "Copyright(c) 2018 Intel Corporation.";
>> +
>> +static const struct pci_device_id igc_pci_tbl[] = {
>> + { PCI_VDEVICE(INTEL, IGC_DEV_ID_I225_LM) },
>> + { PCI_VDEVICE(INTEL, IGC_DEV_ID_I225_V) },
>> + /* required last entry */
>> + {0, }
>> +};
>> +
>> +MODULE_DEVICE_TABLE(pci, igc_pci_tbl);
>> +
>> +/**
>> + * igc_probe - Device Initialization Routine
>> + * @pdev: PCI device information struct
>> + * @ent: entry in igc_pci_tbl
>> + *
>> + * Returns 0 on success, negative on failure
>> + *
>> + * igc_probe initializes an adapter identified by a pci_dev structure.
>> + * The OS initialization, configuring the adapter private structure,
>> + * and a hardware reset occur.
>> + */
>> +static int igc_probe(struct pci_dev *pdev,
>> + const struct pci_device_id *ent)
>> +{
>> + int err, pci_using_dac;
>> +
>> + err = pci_enable_device_mem(pdev);
>> + if (err)
>> + return err;
>> +
>> + pci_using_dac = 0;
>> + err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
>> + if (!err) {
>> + err = dma_set_coherent_mask(&pdev->dev,
>> + DMA_BIT_MASK(64));
>> + if (!err)
>> + pci_using_dac = 1;
>
> You never use this pci_using_dac. dma_set_mask_and_coherent() maybe?
>
Right. I saw already somebody sent out patch to fix that.
>> + } else {
>> + err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
>> + if (err) {
>> + err = dma_set_coherent_mask(&pdev->dev,
>> + DMA_BIT_MASK(32));
>> + if (err) {
>> + IGC_ERR("Wrong DMA configuration, aborting\n");
>> + goto err_dma;
>> + }
>> + }
>> + }
>> +
>> + err = pci_request_selected_regions(pdev,
>> + pci_select_bars(pdev,
>> + IORESOURCE_MEM),
>> + igc_driver_name);
>> + if (err)
>> + goto err_pci_reg;
>> +
>> + pci_set_master(pdev);
>> + err = pci_save_state(pdev);
>
> And you never look at err?
>
Same as above.
>> + return 0;
>> +
>> +err_pci_reg:
>> +err_dma:
>
> The error label should be named after what it points to, not where it's
> coming from.
>
>> + pci_disable_device(pdev);
>> + return err;
>> +}
>> +
>> +/**
>> + * igc_remove - Device Removal Routine
>> + * @pdev: PCI device information struct
>> + *
>> + * igc_remove is called by the PCI subsystem to alert the driver
>> + * that it should release a PCI device. This could be caused by a
>> + * Hot-Plug event, or because the driver is going to be removed from
>> + * memory.
>> + */
>> +static void igc_remove(struct pci_dev *pdev)
>> +{
>> + pci_release_selected_regions(pdev,
>> + pci_select_bars(pdev, IORESOURCE_MEM));
>> +
>> + pci_disable_device(pdev);
>> +}
>> +
>> +static struct pci_driver igc_driver = {
>> + .name = igc_driver_name,
>> + .id_table = igc_pci_tbl,
>> + .probe = igc_probe,
>> + .remove = igc_remove,
>> +};
>> +
>> +/**
>> + * igc_init_module - Driver Registration Routine
>> + *
>> + * igc_init_module is the first routine called when the driver is
>> + * loaded. All it does is register with the PCI subsystem.
>> + */
>> +static int __init igc_init_module(void)
>> +{
>> + int ret;
>> +
>> + pr_info("%s - version %s\n",
>> + igc_driver_string, igc_driver_version);
>> +
>> + pr_info("%s\n", igc_copyright);
>> +
>> + ret = pci_register_driver(&igc_driver);
>> + return ret;
>
> Why the variable?
>
we can return 'pci_register_driver' here, but variable is more clearly.
>> +}
>> +
>> +module_init(igc_init_module);
>> +
>> +/**
>> + * igc_exit_module - Driver Exit Cleanup Routine
>> + *
>> + * igc_exit_module is called just before the driver is removed
>> + * from memory.
>> + */
>> +static void __exit igc_exit_module(void)
>> +{
>> + pci_unregister_driver(&igc_driver);
>> +}
>> +
>> +module_exit(igc_exit_module);
>> +/* igc_main.c */
>
> I'd argue most editors make it fairly clear which file one is
> editing, hence making this sort of comments entirely superfluous :)
>
Thanks for your comments.
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