Date:   Fri, 4 Nov 2022 15:20:48 +0530
From:   Md Danish Anwar <a0501179@...com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
CC:     <afd@...com>, <andrew@...n.ch>, <davem@...emloft.net>,
        <devicetree@...r.kernel.org>, <edumazet@...gle.com>,
        <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <nm@...com>, <robh+dt@...nel.org>, <rogerq@...nel.org>,
        <s-anna@...com>, <ssantosh@...nel.org>, <vigneshr@...com>
Subject: Re: [PATCH v2 2/2] net: ti: icssg-prueth: Add ICSSG ethernet driver



On 05/06/22 21:54, Christophe JAILLET wrote:
> Hi,
> 
> Just a few comments below, for what they worth.
> 
> Le 31/05/2022 à 11:51, Puranjay Mohan a écrit :
>> From: Roger Quadros <rogerq-l0cyMroinI0@...lic.gmane.org>
>>
>> This is the Ethernet driver for TI AM654 Silicon rev. 2
>> with the ICSSG PRU Sub-system running dual-EMAC firmware.
>>
> 
> [...]
> 
>> +static int prueth_netdev_init(struct prueth *prueth,
>> +                  struct device_node *eth_node)
>> +{
>> +    int ret, num_tx_chn = PRUETH_MAX_TX_QUEUES;
>> +    struct prueth_emac *emac;
>> +    struct net_device *ndev;
>> +    enum prueth_port port;
>> +    enum prueth_mac mac;
>> +
>> +    port = prueth_node_port(eth_node);
>> +    if (port < 0)
>> +        return -EINVAL;
>> +
>> +    mac = prueth_node_mac(eth_node);
>> +    if (mac < 0)
>> +        return -EINVAL;
>> +
>> +    ndev = alloc_etherdev_mq(sizeof(*emac), num_tx_chn);
>> +    if (!ndev)
>> +        return -ENOMEM;
>> +
>> +    emac = netdev_priv(ndev);
>> +    prueth->emac[mac] = emac;
>> +    emac->prueth = prueth;
>> +    emac->ndev = ndev;
>> +    emac->port_id = port;
>> +    emac->cmd_wq = create_singlethread_workqueue("icssg_cmd_wq");
>> +    if (!emac->cmd_wq) {
>> +        ret = -ENOMEM;
>> +        goto free_ndev;
>> +    }
>> +    INIT_WORK(&emac->rx_mode_work, emac_ndo_set_rx_mode_work);
>> +
>> +    ret = pruss_request_mem_region(prueth->pruss,
>> +                       port == PRUETH_PORT_MII0 ?
>> +                       PRUSS_MEM_DRAM0 : PRUSS_MEM_DRAM1,
>> +                       &emac->dram);
>> +    if (ret) {
>> +        dev_err(prueth->dev, "unable to get DRAM: %d\n", ret);
>> +        return -ENOMEM;
> 
> goto free_wq; ?
> 

I'll add it.

>> +    }
>> +
>> +    emac->tx_ch_num = 1;
>> +
>> +    SET_NETDEV_DEV(ndev, prueth->dev);
>> +    spin_lock_init(&emac->lock);
>> +    mutex_init(&emac->cmd_lock);
>> +
>> +    emac->phy_node = of_parse_phandle(eth_node, "phy-handle", 0);
>> +    if (!emac->phy_node && !of_phy_is_fixed_link(eth_node)) {
>> +        dev_err(prueth->dev, "couldn't find phy-handle\n");
>> +        ret = -ENODEV;
>> +        goto free;
>> +    } else if (of_phy_is_fixed_link(eth_node)) {
>> +        ret = of_phy_register_fixed_link(eth_node);
>> +        if (ret) {
>> +            ret = dev_err_probe(prueth->dev, ret,
>> +                        "failed to register fixed-link phy\n");
>> +            goto free;
>> +        }
>> +
>> +        emac->phy_node = eth_node;
>> +    }
>> +
>> +    ret = of_get_phy_mode(eth_node, &emac->phy_if);
>> +    if (ret) {
>> +        dev_err(prueth->dev, "could not get phy-mode property\n");
>> +        goto free;
>> +    }
>> +
>> +    if (emac->phy_if != PHY_INTERFACE_MODE_MII &&
>> +        !phy_interface_mode_is_rgmii(emac->phy_if)) {
>> +        dev_err(prueth->dev, "PHY mode unsupported %s\n",
>> phy_modes(emac->phy_if));
>> +        goto free;
>> +    }
>> +
>> +    ret = prueth_config_rgmiidelay(prueth, eth_node, emac->phy_if);
>> +    if (ret)
>> +        goto free;
>> +
>> +    /* get mac address from DT and set private and netdev addr */
>> +    ret = of_get_ethdev_address(eth_node, ndev);
>> +    if (!is_valid_ether_addr(ndev->dev_addr)) {
>> +        eth_hw_addr_random(ndev);
>> +        dev_warn(prueth->dev, "port %d: using random MAC addr: %pM\n",
>> +             port, ndev->dev_addr);
>> +    }
>> +    ether_addr_copy(emac->mac_addr, ndev->dev_addr);
>> +
>> +    ndev->netdev_ops = &emac_netdev_ops;
>> +    ndev->ethtool_ops = &icssg_ethtool_ops;
>> +    ndev->hw_features = NETIF_F_SG;
>> +    ndev->features = ndev->hw_features;
>> +
>> +    netif_napi_add(ndev, &emac->napi_rx,
>> +               emac_napi_rx_poll, NAPI_POLL_WEIGHT);
>> +
>> +    return 0;
>> +
>> +free:
>> +    pruss_release_mem_region(prueth->pruss, &emac->dram);
> 
> free_wq:
> 

>From what I understand, the labels would look like this.

free:
	pruss_release_mem_region(prueth->pruss, &emac->dram);
	destroy_workqueue(emac->cmd_wq);
free_wq:
	destroy_workqueue(emac->cmd_wq);

>> +    destroy_workqueue(emac->cmd_wq);
>> +free_ndev:
>> +    free_netdev(ndev);
>> +    prueth->emac[mac] = NULL;
>> +
>> +    return ret;
>> +}
>> +
>> +static void prueth_netdev_exit(struct prueth *prueth,
>> +                   struct device_node *eth_node)
>> +{
>> +    struct prueth_emac *emac;
>> +    enum prueth_mac mac;
>> +
>> +    mac = prueth_node_mac(eth_node);
>> +    if (mac < 0)
>> +        return;
>> +
>> +    emac = prueth->emac[mac];
>> +    if (!emac)
>> +        return;
>> +
>> +    if (of_phy_is_fixed_link(emac->phy_node))
>> +        of_phy_deregister_fixed_link(emac->phy_node);
>> +
>> +    netif_napi_del(&emac->napi_rx);
>> +
>> +    pruss_release_mem_region(prueth->pruss, &emac->dram);
>> +    destroy_workqueue(emac->cmd_wq);
>> +    free_netdev(emac->ndev);
>> +    prueth->emac[mac] = NULL;
>> +}
>> +
>> +static int prueth_get_cores(struct prueth *prueth, int slice)
>> +{
>> +    enum pruss_pru_id pruss_id;
>> +    struct device *dev = prueth->dev;
>> +    struct device_node *np = dev->of_node;
>> +    int idx = -1, ret;
>> +
>> +    switch (slice) {
>> +    case ICSS_SLICE0:
>> +        idx = 0;
>> +        break;
>> +    case ICSS_SLICE1:
>> +        idx = 3;
>> +        break;
>> +    default:
>> +        return -EINVAL;
>> +    }
>> +
>> +    prueth->pru[slice] = pru_rproc_get(np, idx, &pruss_id);
>> +    if (IS_ERR(prueth->pru[slice])) {
>> +        ret = PTR_ERR(prueth->pru[slice]);
>> +        prueth->pru[slice] = NULL;
>> +        if (ret != -EPROBE_DEFER)
>> +            dev_err(dev, "unable to get PRU%d: %d\n", slice, ret);
> 
> return dev_err_probe()?
> 

Sure I'll return dev_err_probe() instead of the above.

I'll add below line
return dev_err_probe(dev,ret,"unable to get PRU%d\n", slice);

>> +        return ret;
>> +    }
>> +    prueth->pru_id[slice] = pruss_id;
>> +
>> +    idx++;
>> +    prueth->rtu[slice] = pru_rproc_get(np, idx, NULL);
>> +    if (IS_ERR(prueth->rtu[slice])) {
>> +        ret = PTR_ERR(prueth->rtu[slice]);
>> +        prueth->rtu[slice] = NULL;
>> +        if (ret != -EPROBE_DEFER)
>> +            dev_err(dev, "unable to get RTU%d: %d\n", slice, ret);
> 
> Same.
> 

Sure, I'll do that.

>> +        return ret;
>> +    }
>> +
>> +    idx++;
>> +    prueth->txpru[slice] = pru_rproc_get(np, idx, NULL);
>> +    if (IS_ERR(prueth->txpru[slice])) {
>> +        ret = PTR_ERR(prueth->txpru[slice]);
>> +        prueth->txpru[slice] = NULL;
>> +        if (ret != -EPROBE_DEFER)
>> +            dev_err(dev, "unable to get TX_PRU%d: %d\n",
>> +                slice, ret);
> 
> Same.
> 

Sure, I'll do that.

>> +        return ret;
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +static void prueth_put_cores(struct prueth *prueth, int slice)
>> +{
>> +    if (prueth->txpru[slice])
>> +        pru_rproc_put(prueth->txpru[slice]);
>> +
>> +    if (prueth->rtu[slice])
>> +        pru_rproc_put(prueth->rtu[slice]);
>> +
>> +    if (prueth->pru[slice])
>> +        pru_rproc_put(prueth->pru[slice]);
>> +}
>> +
>> +static const struct of_device_id prueth_dt_match[];
>> +
>> +static int prueth_probe(struct platform_device *pdev)
>> +{
>> +    struct prueth *prueth;
>> +    struct device *dev = &pdev->dev;
>> +    struct device_node *np = dev->of_node;
>> +    struct device_node *eth_ports_node;
>> +    struct device_node *eth_node;
>> +    struct device_node *eth0_node, *eth1_node;
>> +    const struct of_device_id *match;
>> +    struct pruss *pruss;
>> +    int i, ret;
>> +    u32 msmc_ram_size;
>> +    struct genpool_data_align gp_data = {
>> +        .align = SZ_64K,
>> +    };
>> +
>> +    match = of_match_device(prueth_dt_match, dev);
>> +    if (!match)
>> +        return -ENODEV;
>> +
>> +    prueth = devm_kzalloc(dev, sizeof(*prueth), GFP_KERNEL);
>> +    if (!prueth)
>> +        return -ENOMEM;
>> +
>> +    dev_set_drvdata(dev, prueth);
>> +    prueth->pdev = pdev;
>> +    prueth->pdata = *(const struct prueth_pdata *)match->data;
>> +
>> +    prueth->dev = dev;
>> +    eth_ports_node = of_get_child_by_name(np, "ethernet-ports");
>> +    if (!eth_ports_node)
>> +        return -ENOENT;
>> +
>> +    for_each_child_of_node(eth_ports_node, eth_node) {
>> +        u32 reg;
>> +
>> +        if (strcmp(eth_node->name, "port"))
>> +            continue;
>> +        ret = of_property_read_u32(eth_node, "reg", &reg);
>> +        if (ret < 0) {
>> +            dev_err(dev, "%pOF error reading port_id %d\n",
>> +                eth_node, ret);
>> +        }
>> +
>> +        of_node_get(eth_node);
>> +
>> +        if (reg == 0)
>> +            eth0_node = eth_node;
>> +        else if (reg == 1)
>> +            eth1_node = eth_node;
>> +        else
>> +            dev_err(dev, "port reg should be 0 or 1\n");
>> +    }
>> +
>> +    of_node_put(eth_ports_node);
>> +
>> +    /* At least one node must be present and available else we fail */
>> +    if (!eth0_node && !eth1_node) {
>> +        dev_err(dev, "neither port0 nor port1 node available\n");
>> +        return -ENODEV;
>> +    }
>> +
>> +    if (eth0_node == eth1_node) {
>> +        dev_err(dev, "port0 and port1 can't have same reg\n");
>> +        of_node_put(eth0_node);
>> +        return -ENODEV;
>> +    }
>> +
>> +    prueth->eth_node[PRUETH_MAC0] = eth0_node;
>> +    prueth->eth_node[PRUETH_MAC1] = eth1_node;
>> +
>> +    prueth->miig_rt = syscon_regmap_lookup_by_phandle(np, "ti,mii-g-rt");
>> +    if (IS_ERR(prueth->miig_rt)) {
>> +        dev_err(dev, "couldn't get ti,mii-g-rt syscon regmap\n");
>> +        return -ENODEV;
>> +    }
>> +
>> +    prueth->mii_rt = syscon_regmap_lookup_by_phandle(np, "ti,mii-rt");
>> +    if (IS_ERR(prueth->mii_rt)) {
>> +        dev_err(dev, "couldn't get ti,mii-rt syscon regmap\n");
>> +        return -ENODEV;
>> +    }
>> +
>> +    if (eth0_node) {
>> +        ret = prueth_get_cores(prueth, ICSS_SLICE0);
>> +        if (ret)
>> +            goto put_cores;
>> +    }
>> +
>> +    if (eth1_node) {
>> +        ret = prueth_get_cores(prueth, ICSS_SLICE1);
>> +        if (ret)
>> +            goto put_cores;
>> +    }
>> +
>> +    pruss = pruss_get(eth0_node ?
>> +              prueth->pru[ICSS_SLICE0] : prueth->pru[ICSS_SLICE1]);
>> +    if (IS_ERR(pruss)) {
>> +        ret = PTR_ERR(pruss);
>> +        dev_err(dev, "unable to get pruss handle\n");
>> +        goto put_cores;
>> +    }
>> +
>> +    prueth->pruss = pruss;
>> +
>> +    ret = pruss_request_mem_region(pruss, PRUSS_MEM_SHRD_RAM2,
>> +                       &prueth->shram);
>> +    if (ret) {
>> +        dev_err(dev, "unable to get PRUSS SHRD RAM2: %d\n", ret);
>> +        goto put_mem;
> 
> Is it safe to call pruss_release_mem_region() if pruss_request_mem_region() has
> failed?
> 

There is no need to call pruss_release_mem_region() if
pruss_request_mem_region() has failed.

The label put_mem, calls pruss_release_mem_region() and pruss_put().

Here instead of going to label and calling both the functions, I will just call
pruss_put() function.

So the if condition would be something like this.

if (ret) {
    dev_err(dev, "unable to get PRUSS SHRD RAM2: %d\n", ret);
    pruss_put(prueth->pruss);
}

> The other place where it is called it is not done the same way.
> 

>> +    }
>> +
>> +    prueth->sram_pool = of_gen_pool_get(np, "sram", 0);
>> +    if (!prueth->sram_pool) {
>> +        dev_err(dev, "unable to get SRAM pool\n");
>> +        ret = -ENODEV;
>> +
>> +        goto put_mem;
>> +    }
>> +
>> +    msmc_ram_size = MSMC_RAM_SIZE;
>> +
>> +    /* NOTE: FW bug needs buffer base to be 64KB aligned */
>> +    prueth->msmcram.va =
>> +        (void __iomem *)gen_pool_alloc_algo(prueth->sram_pool,
>> +                            msmc_ram_size,
>> +                            gen_pool_first_fit_align,
>> +                            &gp_data);
>> +
>> +    if (!prueth->msmcram.va) {
>> +        ret = -ENOMEM;
>> +        dev_err(dev, "unable to allocate MSMC resource\n");
>> +        goto put_mem;
>> +    }
>> +    prueth->msmcram.pa = gen_pool_virt_to_phys(prueth->sram_pool,
>> +                           (unsigned long)prueth->msmcram.va);
>> +    prueth->msmcram.size = msmc_ram_size;
>> +    memset(prueth->msmcram.va, 0, msmc_ram_size);
>> +    dev_dbg(dev, "sram: pa %llx va %p size %zx\n", prueth->msmcram.pa,
>> +        prueth->msmcram.va, prueth->msmcram.size);
>> +
>> +    /* setup netdev interfaces */
>> +    if (eth0_node) {
>> +        ret = prueth_netdev_init(prueth, eth0_node);
>> +        if (ret) {
>> +            if (ret != -EPROBE_DEFER) {
>> +                dev_err(dev, "netdev init %s failed: %d\n",
>> +                    eth0_node->name, ret);
> 
> dev_err_probe()?
> 

Sure, I'll do that.

>> +            }
>> +            goto netdev_exit;
>> +        }
>> +    }
>> +
>> +    if (eth1_node) {
>> +        ret = prueth_netdev_init(prueth, eth1_node);
>> +        if (ret) {
>> +            if (ret != -EPROBE_DEFER) {
>> +                dev_err(dev, "netdev init %s failed: %d\n",
>> +                    eth1_node->name, ret);
> 
> dev_err_probe()?
> 

Sure, I'll do that.

>> +            }
>> +            goto netdev_exit;
>> +        }
>> +    }
>> +
>> +    /* register the network devices */
>> +    if (eth0_node) {
>> +        ret = register_netdev(prueth->emac[PRUETH_MAC0]->ndev);
>> +        if (ret) {
>> +            dev_err(dev, "can't register netdev for port MII0");
>> +            goto netdev_exit;
>> +        }
>> +
>> +        prueth->registered_netdevs[PRUETH_MAC0] =
>> prueth->emac[PRUETH_MAC0]->ndev;
>> +
>> +        emac_phy_connect(prueth->emac[PRUETH_MAC0]);
>> +        phy_attached_info(prueth->emac[PRUETH_MAC0]->ndev->phydev);
>> +    }
>> +
>> +    if (eth1_node) {
>> +        ret = register_netdev(prueth->emac[PRUETH_MAC1]->ndev);
>> +        if (ret) {
>> +            dev_err(dev, "can't register netdev for port MII1");
>> +            goto netdev_unregister;
>> +        }
>> +
>> +        prueth->registered_netdevs[PRUETH_MAC1] =
>> prueth->emac[PRUETH_MAC1]->ndev;
>> +        emac_phy_connect(prueth->emac[PRUETH_MAC1]);
>> +        phy_attached_info(prueth->emac[PRUETH_MAC1]->ndev->phydev);
>> +    }
>> +
>> +    dev_info(dev, "TI PRU ethernet driver initialized: %s EMAC mode\n",
>> +         (!eth0_node || !eth1_node) ? "single" : "dual");
>> +
>> +    if (eth1_node)
>> +        of_node_put(eth1_node);
>> +    if (eth0_node)
>> +        of_node_put(eth0_node);
>> +    return 0;
>> +
>> +netdev_unregister:
>> +    for (i = 0; i < PRUETH_NUM_MACS; i++) {
>> +        if (!prueth->registered_netdevs[i])
>> +            continue;
>> +        if (prueth->emac[i]->ndev->phydev) {
>> +            phy_disconnect(prueth->emac[i]->ndev->phydev);
>> +            prueth->emac[i]->ndev->phydev = NULL;
>> +        }
>> +        unregister_netdev(prueth->registered_netdevs[i]);
>> +    }
>> +
>> +netdev_exit:
>> +    for (i = 0; i < PRUETH_NUM_MACS; i++) {
>> +        struct device_node *eth_node;
>> +
>> +        eth_node = prueth->eth_node[i];
>> +        if (!eth_node)
>> +            continue;
>> +
>> +        prueth_netdev_exit(prueth, eth_node);
>> +    }
>> +
>> +gen_pool_free(prueth->sram_pool,
> 
> 1 tab missing.
> 

I'll indent it properly.

>> +          (unsigned long)prueth->msmcram.va, msmc_ram_size);
>> +
>> +put_mem:
>> +    pruss_release_mem_region(prueth->pruss, &prueth->shram);
>> +    pruss_put(prueth->pruss);
>> +
>> +put_cores:
>> +    if (eth1_node) {
>> +        prueth_put_cores(prueth, ICSS_SLICE1);
>> +        of_node_put(eth1_node);
>> +    }
>> +
>> +    if (eth0_node) {
>> +        prueth_put_cores(prueth, ICSS_SLICE0);
>> +        of_node_put(eth0_node);
>> +    }
>> +
>> +    return ret;
>> +}
> 
> [...]
> 
> From mboxrd@z Thu Jan  1 00:00:00 1970
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