linux-kernel - RE: [PATCH net-next v13 01/13] rtase: Add pci table supported in this module

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Message-ID: <ae4807e31b53452ebf176098d95cf1fb@realtek.com>
Date:   Wed, 6 Dec 2023 03:28:32 +0000
From:   Justin Lai <justinlai0215@...ltek.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        Larry Chiu <larry.chiu@...ltek.com>
Subject: RE: [PATCH net-next v13 01/13] rtase: Add pci table supported in this module

> On Thu, 30 Nov 2023 19:43:15 +0800 Justin Lai wrote:
> > +#include <linux/crc32.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/etherdevice.h>
> > +#include <linux/if_vlan.h>
> > +#include <linux/in.h>
> > +#include <linux/init.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/io.h>
> > +#include <linux/iopoll.h>
> > +#include <linux/ip.h>
> > +#include <linux/ipv6.h>
> > +#include <linux/mdio.h>
> > +#include <linux/module.h>
> > +#include <linux/moduleparam.h>
> 
> I don't see module params, please trim the includes.

Thanks, I will remove it.

> 
> > +#include <linux/netdevice.h>
> > +#include <linux/pci.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/prefetch.h>
> > +#include <linux/rtnetlink.h>
> > +#include <linux/tcp.h>
> > +#include <asm/irq.h>
> > +#include <net/ip6_checksum.h>
> > +#include <net/page_pool/helpers.h>
> > +#include <net/pkt_cls.h>
> 
> > +static void rtase_get_mac_address(struct net_device *dev) {
> > +     struct rtase_private *tp = netdev_priv(dev);
> > +     u8 mac_addr[ETH_ALEN] __aligned(2) = {};
> > +     u32 i;
> > +
> > +     for (i = 0; i < ETH_ALEN; i++)
> > +             mac_addr[i] = rtase_r8(tp, RTASE_MAC0 + i);
> > +
> > +     if (!is_valid_ether_addr(mac_addr)) {
> > +             eth_random_addr(mac_addr);
> > +             dev->addr_assign_type = NET_ADDR_RANDOM;
> 
> eth_hw_addr_random()

I will use this function instead for this part.

> 
> > +             netdev_warn(dev, "Random ether addr %pM\n",
> mac_addr);
> > +     }
> > +
> > +     eth_hw_addr_set(dev, mac_addr);
> > +     rtase_rar_set(tp, mac_addr);
> > +
> > +     ether_addr_copy(dev->perm_addr, dev->dev_addr);
> 
> Should it be perm if it's random?

No, I will modify this part.

> 
> > +}
> > +
> > +static void rtase_reset_interrupt(struct pci_dev *pdev,
> > +                               const struct rtase_private *tp) {
> > +     if (tp->sw_flag & SWF_MSIX_ENABLED)
> > +             pci_disable_msix(pdev);
> > +     else
> > +             pci_disable_msi(pdev);
> > +}
> > +
> > +static int rtase_alloc_msix(struct pci_dev *pdev, struct
> > +rtase_private *tp) {
> > +     int ret;
> > +     u16 i;
> > +
> > +     memset(tp->msix_entry, 0x0, RTASE_NUM_MSIX * sizeof(struct
> > + msix_entry));
> > +
> > +     for (i = 0; i < RTASE_NUM_MSIX; i++)
> > +             tp->msix_entry[i].entry = i;
> > +
> > +     ret = pci_enable_msix_range(pdev, tp->msix_entry, tp->int_nums,
> > +                                 tp->int_nums);
> 
> pci_enable_msix_exact()

Thanks, I will use this function instead.

> 
> > +     if (ret == tp->int_nums) {
> > +             for (i = 0; i < tp->int_nums; i++) {
> > +                     tp->int_vector[i].irq = pci_irq_vector(pdev, i);
> > +                     tp->int_vector[i].status = 1;
> > +             }
> > +     }
> > +
> > +     return ret;
> > +}
> 
> > +     if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)))
> > +             dev->features |= NETIF_F_HIGHDMA;
> > +     else if (dma_set_mask_and_coherent(&pdev->dev,
> DMA_BIT_MASK(32)))
> > +             goto err_out_free_res;
> > +     else
> > +             dev_info(&pdev->dev, "DMA_BIT_MASK: 32\n");
> 
> This dance is unnecessary, see https://lkml.org/lkml/2021/6/7/398

Thank you for providing this information, I will remove the 32-bit part.

> 
> > +     dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
> > +     if (!dev->tstats)
> > +             goto err_out_1;
> 
> Please use dev->pcpu_stat_type
> Set it before register and core will allocate stats for you.

Thanks for your suggestion, I will allocate stats by setting dev->pcpu_stat_type.

> 
> > +     ret = register_netdev(dev);
> > +     if (ret != 0)
> > +             goto err_out;
> > +
> > +     netdev_dbg(dev, "%pM, IRQ %d\n", dev->dev_addr, dev->irq);
> > +
> > +     netif_carrier_off(dev);
> 
> Should be before register_netdev().
 
Ok, I will do that.

> 
> > +     goto out;
> 
> Just return 0...

I will modify it.

> 
> > +static void rtase_remove_one(struct pci_dev *pdev) {
> > +     struct net_device *dev = pci_get_drvdata(pdev);
> > +     struct rtase_private *tp = netdev_priv(dev);
> > +     struct rtase_int_vector *ivec;
> > +     u32 i;
> > +
> > +     for (i = 0; i < tp->int_nums; i++) {
> > +             ivec = &tp->int_vector[i];
> > +             netif_napi_del(&ivec->napi);
> 
> NAPI instances should be added on ndo_open()

Do you want me to call netif_napi_add() in the .ndo_open function, and netif_napi_del() in the .ndo_stop function?
However, I saw that many drivers do it in probe and remove. What is the purpose of doing this in .ndo_open and .ndo_stop?