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Date: Tue, 18 Mar 2014 15:16:14 -0700
From: Byungho An <bh74.an@...sung.com>
To: 'Florian Fainelli' <f.fainelli@...il.com>
Cc: 'netdev' <netdev@...r.kernel.org>,
linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
'David Miller' <davem@...emloft.net>,
"'siva.kallam'" <siva.kallam@...sung.com>,
"'ks.giri'" <ks.giri@...sung.com>,
"'ilho215.lee'" <ilho215.lee@...sung.com>,
"'vipul.pandya'" <vipul.pandya@...sung.com>
Subject: RE: [PATCH V5 2/8] net: sxgbe: add basic framework for Samsung 10Gb
ethernet driver
Florian Fainelli <f.fainelli@...il.com> wrote:
> 2014-03-18 11:19 GMT-07:00 Byungho An <bh74.an@...sung.com>:
> > From: Siva Reddy <siva.kallam@...sung.com>
> >
> > This patch adds support for Samsung 10Gb ethernet driver(sxgbe).
> >
> > - sxgbe core initialization
> > - Tx and Rx support
> > - MDIO support
> > - ISRs for Tx and Rx
> > - ifconfig support to driver
>
> Too many files to review at once, the diffstat was around 5000+ lines!
> You should split this into logical parts, or just submit the basic bits for now and
> add the features later.
Yes. but I think it is one logically, after this patch there won't be much code at once.
>
> [snip]
>
> > + ret = register_netdev(ndev);
> > + if (ret) {
> > + pr_err("%s: ERROR %i registering the device\n", __func__, ret);
> > + goto error_netdev_register;
> > + }
> > +
> > + priv->sxgbe_clk = clk_get(priv->device, SXGBE_RESOURCE_NAME);
> > + if (IS_ERR(priv->sxgbe_clk)) {
> > + netdev_warn(ndev, "%s: warning: cannot get CSR clock\n",
> > + __func__);
> > + goto error_clk_get;
> > + }
>
> This is racy, after register_netdev() is called, the network stack is free to use
> the interface, which means that as much as possible needs to be initialized
> before you call it, including clocks, and MDIO.
>
> > +
> > + /* If a specific clk_csr value is passed from the platform
> > + * this means that the CSR Clock Range selection cannot be
> > + * changed at run-time and it is fixed. Viceversa the driver'll try to
> > + * set the MDC clock dynamically according to the csr actual
> > + * clock input.
> > + */
> > + if (!priv->plat->clk_csr)
> > + sxgbe_clk_csr_set(priv);
> > + else
> > + priv->clk_csr = priv->plat->clk_csr;
> > +
> > + /* MDIO bus Registration */
> > + ret = sxgbe_mdio_register(ndev);
> > + if (ret < 0) {
> > + netdev_dbg(ndev, "%s: MDIO bus (id: %d) registration failed\n",
> > + __func__, priv->plat->bus_id);
> > + goto error_mdio_register;
> > + }
>
> Don't do this, register your MDIO bus before calling register_netdev().
OK.
>
> > +
> > + sxgbe_check_ether_addr(priv);
> > +
> > + return priv;
> > +
> > +error_mdio_register:
> > + clk_put(priv->sxgbe_clk);
> > +error_clk_get:
> > + unregister_netdev(ndev);
> > +error_netdev_register:
> > + netif_napi_del(&priv->napi);
> > +error_free_netdev:
> > + free_netdev(ndev);
> > +
> > + return NULL;
> > +}
> > +
> > +/**
> > + * sxgbe_dvr_remove
> > + * @ndev: net device pointer
> > + * Description: this function resets the TX/RX processes, disables
> > +the MAC RX/TX
> > + * changes the link status, releases the DMA descriptor rings.
> > + */
> > +int sxgbe_dvr_remove(struct net_device *ndev) {
> > + struct sxgbe_priv_data *priv = netdev_priv(ndev);
> > +
> > + netdev_info(ndev, "%s: removing driver\n", __func__);
> > +
> > + priv->hw->dma->stop_rx(priv->ioaddr, SXGBE_RX_QUEUES);
> > + priv->hw->dma->stop_tx(priv->ioaddr, SXGBE_TX_QUEUES);
> > +
> > + priv->hw->mac->enable_tx(priv->ioaddr, false);
> > + priv->hw->mac->enable_rx(priv->ioaddr, false);
> > +
> > + netif_napi_del(&priv->napi);
> > +
> > + sxgbe_mdio_unregister(ndev);
> > +
> > + netif_carrier_off(ndev);
>
> This is not required, both the PHY library and the network stack will do that for
> you.
You mean netif_napi_del and netif_carrier_off? or all of sxgbe_dvr_remove function?
I think dma/mac control are needed.
>
> [snip]
>
> > + /* register with kernel subsystem */
> > + err = mdiobus_register(mdio_bus);
> > + if (err != 0) {
> > + netdev_err(ndev, "mdiobus register failed\n");
> > + goto mdiobus_err;
> > + }
> > +
> > + for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
> > + struct phy_device *phy = mdio_bus->phy_map[phy_addr];
> > + if (phy) {
> > + char irq_num[4];
> > + char *irq_str;
> > + /* If an IRQ was provided to be assigned after
> > + * the bus probe, do it here.
> > + */
> > + if ((mdio_data->irqs == NULL) &&
> > + (mdio_data->probed_phy_irq > 0)) {
> > + irqlist[phy_addr] = mdio_data->probed_phy_irq;
> > + phy->irq = mdio_data->probed_phy_irq;
> > + }
> > +
> > + /* If we're going to bind the MAC to this PHY bus,
> > + * and no PHY number was provided to the MAC,
> > + * use the one probed here.
> > + */
> > + if (priv->plat->phy_addr == -1)
> > + priv->plat->phy_addr = phy_addr;
> > +
> > + act = (priv->plat->phy_addr == phy_addr);
> > + switch (phy->irq) {
> > + case PHY_POLL:
> > + irq_str = "POLL";
> > + break;
> > + case PHY_IGNORE_INTERRUPT:
> > + irq_str = "IGNORE";
> > + break;
> > + default:
> > + sprintf(irq_num, "%d", phy->irq);
> > + irq_str = irq_num;
> > + break;
> > + }
> > + netdev_info(ndev, "PHY ID %08x at %d IRQ %s (%s)%s\n",
> > + phy->phy_id, phy_addr, irq_str,
> > + dev_name(&phy->dev), act ? " active" : "");
> > + phy_found = 1;
> > + }
>
> This is clunky, and you are duplicating what of_mdiobus_register() will do for
> you, but since you are not using the standard Ethernet PHY device tree node,
> you could not use that code. So please use the standard Ethernet PHY device
> tree node such that you can remove that code and leverage it instead.
I'll consider it. but I think after this patch set.
> --
> Florian
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