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Message-ID: <CE56210DD2A0C069+20250722110939.GB125862@nic-Precision-5820-Tower>
Date: Tue, 22 Jul 2025 19:09:39 +0800
From: Yibo Dong <dong100@...se.com>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Cc: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, horms@...nel.org,
corbet@....net, gur.stavi@...wei.com, maddy@...ux.ibm.com,
mpe@...erman.id.au, danishanwar@...com, lee@...ger.us,
gongfan1@...wei.com, lorenzo@...nel.org, geert+renesas@...der.be,
Parthiban.Veerasooran@...rochip.com, lukas.bulwahn@...hat.com,
alexanderduyck@...com, richardcochran@...il.com,
netdev@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 02/15] net: rnpgbe: Add n500/n210 chip support
On Tue, Jul 22, 2025 at 11:26:44AM +0100, Vadim Fedorenko wrote:
> On 22/07/2025 10:51, Yibo Dong wrote:
> > On Mon, Jul 21, 2025 at 03:21:23PM +0100, Vadim Fedorenko wrote:
> > > On 21/07/2025 12:32, Dong Yibo wrote:
> > > > Initialize n500/n210 chip bar resource map and
> > > > dma, eth, mbx ... info for future use.
> > > >
> > > > Signed-off-by: Dong Yibo <dong100@...se.com>
> > > > ---
> > > > drivers/net/ethernet/mucse/rnpgbe/Makefile | 4 +-
> > > > drivers/net/ethernet/mucse/rnpgbe/rnpgbe.h | 138 ++++++++++++++++++
> > > > .../net/ethernet/mucse/rnpgbe/rnpgbe_chip.c | 138 ++++++++++++++++++
> > > > drivers/net/ethernet/mucse/rnpgbe/rnpgbe_hw.h | 27 ++++
> > > > .../net/ethernet/mucse/rnpgbe/rnpgbe_main.c | 68 ++++++++-
> > > > 5 files changed, 370 insertions(+), 5 deletions(-)
> > > > create mode 100644 drivers/net/ethernet/mucse/rnpgbe/rnpgbe_chip.c
> > > > create mode 100644 drivers/net/ethernet/mucse/rnpgbe/rnpgbe_hw.h
> > > >
>
> [...]
>
> > > > +/**
> > > > + * rnpgbe_get_invariants_n500 - setup for hw info
> > > > + * @hw: hw information structure
> > > > + *
> > > > + * rnpgbe_get_invariants_n500 initializes all private
> > > > + * structure, such as dma, eth, mac and mbx base on
> > > > + * hw->addr for n500
> > > > + **/
> > > > +static void rnpgbe_get_invariants_n500(struct mucse_hw *hw)
> > > > +{
> > > > + struct mucse_dma_info *dma = &hw->dma;
> > > > + struct mucse_eth_info *eth = &hw->eth;
> > > > + struct mucse_mac_info *mac = &hw->mac;
> > > > + struct mucse_mbx_info *mbx = &hw->mbx;
> > > > +
> > > > + /* setup msix base */
> > > > + hw->ring_msix_base = hw->hw_addr + 0x28700;
> > > > + /* setup dma info */
> > > > + dma->dma_base_addr = hw->hw_addr;
> > > > + dma->dma_ring_addr = hw->hw_addr + RNPGBE_RING_BASE;
> > > > + dma->max_tx_queues = RNPGBE_MAX_QUEUES;
> > > > + dma->max_rx_queues = RNPGBE_MAX_QUEUES;
> > > > + dma->back = hw;
> > > > + /* setup eth info */
> > > > + eth->eth_base_addr = hw->hw_addr + RNPGBE_ETH_BASE;
> > > > + eth->back = hw;
> > > > + eth->mc_filter_type = 0;
> > > > + eth->mcft_size = RNPGBE_MC_TBL_SIZE;
> > > > + eth->vft_size = RNPGBE_VFT_TBL_SIZE;
> > > > + eth->num_rar_entries = RNPGBE_RAR_ENTRIES;
> > > > + /* setup mac info */
> > > > + mac->mac_addr = hw->hw_addr + RNPGBE_MAC_BASE;
> > > > + mac->back = hw;
> > > > + /* set mac->mii */
> > > > + mac->mii.addr = RNPGBE_MII_ADDR;
> > > > + mac->mii.data = RNPGBE_MII_DATA;
> > > > + mac->mii.addr_shift = 11;
> > > > + mac->mii.addr_mask = 0x0000F800;
> > > > + mac->mii.reg_shift = 6;
> > > > + mac->mii.reg_mask = 0x000007C0;
> > > > + mac->mii.clk_csr_shift = 2;
> > > > + mac->mii.clk_csr_mask = GENMASK(5, 2);
> > > > + mac->clk_csr = 0x02; /* csr 25M */
> > > > + /* hw fixed phy_addr */
> > > > + mac->phy_addr = 0x11;
> > > > +
> > > > + mbx->mbx_feature |= MBX_FEATURE_NO_ZERO;
> > > > + /* mbx offset */
> > > > + mbx->vf2pf_mbox_vec_base = 0x28900;
> > > > + mbx->fw2pf_mbox_vec = 0x28b00;
> > > > + mbx->pf_vf_shm_base = 0x29000;
> > > > + mbx->mbx_mem_size = 64;
> > > > + mbx->pf2vf_mbox_ctrl_base = 0x2a100;
> > > > + mbx->pf_vf_mbox_mask_lo = 0x2a200;
> > > > + mbx->pf_vf_mbox_mask_hi = 0;
> > > > + mbx->fw_pf_shm_base = 0x2d000;
> > > > + mbx->pf2fw_mbox_ctrl = 0x2e000;
> > > > + mbx->fw_pf_mbox_mask = 0x2e200;
> > > > + mbx->fw_vf_share_ram = 0x2b000;
> > > > + mbx->share_size = 512;
> > > > +
> > > > + /* setup net feature here */
> > > > + hw->feature_flags |= M_NET_FEATURE_SG |
> > > > + M_NET_FEATURE_TX_CHECKSUM |
> > > > + M_NET_FEATURE_RX_CHECKSUM |
> > > > + M_NET_FEATURE_TSO |
> > > > + M_NET_FEATURE_VLAN_FILTER |
> > > > + M_NET_FEATURE_VLAN_OFFLOAD |
> > > > + M_NET_FEATURE_RX_NTUPLE_FILTER |
> > > > + M_NET_FEATURE_RX_HASH |
> > > > + M_NET_FEATURE_USO |
> > > > + M_NET_FEATURE_RX_FCS |
> > > > + M_NET_FEATURE_STAG_FILTER |
> > > > + M_NET_FEATURE_STAG_OFFLOAD;
> > > > + /* start the default ahz, update later */
> > > > + hw->usecstocount = 125;
> > > > +}
> > > > +
> > > > +/**
> > > > + * rnpgbe_get_invariants_n210 - setup for hw info
> > > > + * @hw: hw information structure
> > > > + *
> > > > + * rnpgbe_get_invariants_n210 initializes all private
> > > > + * structure, such as dma, eth, mac and mbx base on
> > > > + * hw->addr for n210
> > > > + **/
> > > > +static void rnpgbe_get_invariants_n210(struct mucse_hw *hw)
> > > > +{
> > > > + struct mucse_mbx_info *mbx = &hw->mbx;
> > > > + /* get invariants based from n500 */
> > > > + rnpgbe_get_invariants_n500(hw);
> > >
> > > it's not a good pattern. if you have some configuration that is
> > > shared amoung devices, it's better to create *base() or *common()
> > > helper and call it from each specific initializer. BTW, why do you
> > > name these functions get_invariants*()? They don't get anything, but
> > > rather init/setup configuration values. It's better to rename it
> > > according to the function.
> > >
> >
> > I try to devide hardware to dma, eth, mac, mbx modules. Different
> > chips may use the same mbx module with different reg-offset in bar.
> > So I setup reg-offset in get_invariants for each chip. And common code,
> > such as mbx achieve functions with the reg-offset.
> > Ok, I will rename it.
>
> I fully understand your intention. My point is that calling
> rnpgbe_get_invariants_n500(hw) in rnpgbe_get_invariants_n210() and
> then replace almost half of the values is not a good pattern.
> It's better to have another function to setup values that are the same
> across models, and keep only specifics in *n500() and *n210().
>
Got your point, I will improve it.
> >
> > > > +
> > > > + /* update msix base */
> > > > + hw->ring_msix_base = hw->hw_addr + 0x29000;
> > > > + /* update mbx offset */
> > > > + mbx->vf2pf_mbox_vec_base = 0x29200;
> > > > + mbx->fw2pf_mbox_vec = 0x29400;
> > > > + mbx->pf_vf_shm_base = 0x29900;
> > > > + mbx->mbx_mem_size = 64;
> > > > + mbx->pf2vf_mbox_ctrl_base = 0x2aa00;
> > > > + mbx->pf_vf_mbox_mask_lo = 0x2ab00;
> > > > + mbx->pf_vf_mbox_mask_hi = 0;
> > > > + mbx->fw_pf_shm_base = 0x2d900;
> > > > + mbx->pf2fw_mbox_ctrl = 0x2e900;
> > > > + mbx->fw_pf_mbox_mask = 0x2eb00;
> > > > + mbx->fw_vf_share_ram = 0x2b900;
> > > > + mbx->share_size = 512;
> > > > + /* update hw feature */
> > > > + hw->feature_flags |= M_HW_FEATURE_EEE;
> > > > + hw->usecstocount = 62;
> > > > +}
>
> [...]
>
> > > > @@ -58,7 +72,54 @@ static int rnpgbe_add_adapter(struct pci_dev *pdev)
> > > > rnpgbe_driver_name, mucse->bd_number);
> > > > pci_set_drvdata(pdev, mucse);
> > > > + hw = &mucse->hw;
> > > > + hw->back = mucse;
> > > > + hw->hw_type = ii->hw_type;
> > > > +
> > > > + switch (hw->hw_type) {
> > > > + case rnpgbe_hw_n500:
> > > > + /* n500 use bar2 */
> > > > + hw_addr = devm_ioremap(&pdev->dev,
> > > > + pci_resource_start(pdev, 2),
> > > > + pci_resource_len(pdev, 2));
> > > > + if (!hw_addr) {
> > > > + dev_err(&pdev->dev, "map bar2 failed!\n");
> > > > + return -EIO;
> > > > + }
> > > > +
> > > > + /* get dma version */
> > > > + dma_version = m_rd_reg(hw_addr);
> > > > + break;
> > > > + case rnpgbe_hw_n210:
> > > > + case rnpgbe_hw_n210L:
> > > > + /* check bar0 to load firmware */
> > > > + if (pci_resource_len(pdev, 0) == 0x100000)
> > > > + return -EIO;
> > > > + /* n210 use bar2 */
> > > > + hw_addr = devm_ioremap(&pdev->dev,
> > > > + pci_resource_start(pdev, 2),
> > > > + pci_resource_len(pdev, 2));
> > > > + if (!hw_addr) {
> > > > + dev_err(&pdev->dev, "map bar2 failed!\n");
> > > > + return -EIO;
> > > > + }
> > > > +
> > > > + /* get dma version */
> > > > + dma_version = m_rd_reg(hw_addr);
> > > > + break;
> > > > + default:
> > > > + err = -EIO;
> > > > + goto err_free_net;
> > > > + }
> > > > + hw->hw_addr = hw_addr;
> > > > + hw->dma.dma_version = dma_version;
> > > > + ii->get_invariants(hw);
> > > > +
> > > > return 0;
> > > > +
> > > > +err_free_net:
> > > > + free_netdev(netdev);
> > > > + return err;
> > > > }
> > >
> > > You have err_free_net label, which is used only in really impossible
> > > case of unknown device, while other cases can return directly and
> > > memleak netdev...>>
> >
> > Yes, It is really impossible case of unknown device. But maybe switch
> > should always has 'default case'? And if in 'default case', nothing To
> > do but free_netdev and return err.
> > Other cases return directly with return 0, and netdev will be freed in
> > rnpgbe_rm_adapter() when rmmod. Sorry, I may not have got the memleak
> > point?
>
> Both rnpgbe_hw_n500 and rnpgbe_hw_n200 cases have error paths which
> directly return -EIO. In this case netdev is not freed and
> rnpgbe_rm_adapter() will not happen as rnpgbe_add_adapter() didn't
> succeed.
>
>
Yes, you are right, memleak may happen here, I will fix it.
Thanks for your feedback.
> >
> > > > /**
> > > > @@ -74,6 +135,7 @@ static int rnpgbe_add_adapter(struct pci_dev *pdev)
> > > > **/
> > > > static int rnpgbe_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> > > > {
> > > > + const struct rnpgbe_info *ii = rnpgbe_info_tbl[id->driver_data];
> > > > int err;
> > > > err = pci_enable_device_mem(pdev);
> > > > @@ -97,7 +159,7 @@ static int rnpgbe_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> > > > pci_set_master(pdev);
> > > > pci_save_state(pdev);
> > > > - err = rnpgbe_add_adapter(pdev);
> > > > + err = rnpgbe_add_adapter(pdev, ii);
> > > > if (err)
> > > > goto err_regions;
> > >
> > >
> >
> > Thanks for your feedback.
> >
>
>
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