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Date: Sat, 13 Nov 2021 00:58:55 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Wells Lu <wellslutw@...il.com>
Cc: davem@...emloft.net, kuba@...nel.org, robh+dt@...nel.org,
netdev@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, p.zabel@...gutronix.de,
vincent.shih@...plus.com, Wells Lu <wells.lu@...plus.com>
Subject: Re: [PATCH v2 2/2] net: ethernet: Add driver for Sunplus SP7021
> +void rx_descs_flush(struct sp_common *comm)
As both Florian and I have said, you need a prefix for all your
functions, structures, etc. sp_ is not the best prefix either, it is
not very unique. spl2sw_ would be better.
> +void rx_descs_clean(struct sp_common *comm)
> +{
> + u32 i, j;
> + struct mac_desc *rx_desc;
> + struct skb_info *rx_skbinfo;
netdev wants reverse christmas tree. You need to change the order of
your local variables, longest lines first, shorted last.
> +
> + for (i = 0; i < RX_DESC_QUEUE_NUM; i++) {
> + if (!comm->rx_skb_info[i])
> + continue;
> +
> + rx_desc = comm->rx_desc[i];
> + rx_skbinfo = comm->rx_skb_info[i];
> + for (j = 0; j < comm->rx_desc_num[i]; j++) {
> + rx_desc[j].cmd1 = 0;
> + wmb(); // Clear OWN_BIT and then set other fields.
> + rx_desc[j].cmd2 = 0;
> + rx_desc[j].addr1 = 0;
> +
> + if (rx_skbinfo[j].skb) {
> + dma_unmap_single(&comm->pdev->dev, rx_skbinfo[j].mapping,
> + comm->rx_desc_buff_size, DMA_FROM_DEVICE);
> + dev_kfree_skb(rx_skbinfo[j].skb);
> + rx_skbinfo[j].skb = NULL;
> + rx_skbinfo[j].mapping = 0;
> + }
> + }
> +
> + kfree(rx_skbinfo);
> + comm->rx_skb_info[i] = NULL;
> + }
> +}
> +int rx_descs_init(struct sp_common *comm)
> +{
> + struct sk_buff *skb;
> + u32 i, j;
> + struct mac_desc *rx_desc;
> + struct skb_info *rx_skbinfo;
> +
> + for (i = 0; i < RX_DESC_QUEUE_NUM; i++) {
> + comm->rx_skb_info[i] = kmalloc_array(comm->rx_desc_num[i],
> + sizeof(struct skb_info), GFP_KERNEL);
> + if (!comm->rx_skb_info[i])
> + goto MEM_ALLOC_FAIL;
> +
> + rx_skbinfo = comm->rx_skb_info[i];
> + rx_desc = comm->rx_desc[i];
> + for (j = 0; j < comm->rx_desc_num[i]; j++) {
> + skb = __dev_alloc_skb(comm->rx_desc_buff_size + RX_OFFSET,
> + GFP_ATOMIC | GFP_DMA);
> + if (!skb)
> + goto MEM_ALLOC_FAIL;
> +
> + skb->dev = comm->ndev;
> + skb_reserve(skb, RX_OFFSET); /* +data +tail */
> +
> + rx_skbinfo[j].skb = skb;
> + rx_skbinfo[j].mapping = dma_map_single(&comm->pdev->dev, skb->data,
> + comm->rx_desc_buff_size,
> + DMA_FROM_DEVICE);
> + rx_desc[j].addr1 = rx_skbinfo[j].mapping;
> + rx_desc[j].addr2 = 0;
> + rx_desc[j].cmd2 = (j == comm->rx_desc_num[i] - 1) ?
> + EOR_BIT | comm->rx_desc_buff_size :
> + comm->rx_desc_buff_size;
> + wmb(); // Set OWN_BIT after other fields are effective.
> + rx_desc[j].cmd1 = OWN_BIT;
> + }
> + }
> +
> + return 0;
> +
> +MEM_ALLOC_FAIL:
lower case labels. Didn't somebody already say that?
> +int descs_init(struct sp_common *comm)
> +{
> + u32 i, ret;
> +
> + // Initialize rx descriptor's data
> + comm->rx_desc_num[0] = RX_QUEUE0_DESC_NUM;
> +#if RX_DESC_QUEUE_NUM > 1
> + comm->rx_desc_num[1] = RX_QUEUE1_DESC_NUM;
> +#endif
Avoid #if statements. Why is this needed?
> +++ b/drivers/net/ethernet/sunplus/sp_driver.c
> @@ -0,0 +1,606 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright Sunplus Technology Co., Ltd.
> + * All rights reserved.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/reset.h>
> +#include <linux/nvmem-consumer.h>
> +#include <linux/of_net.h>
> +#include "sp_driver.h"
> +#include "sp_phy.h"
> +
> +static const char def_mac_addr[ETHERNET_MAC_ADDR_LEN] = {
> + 0xfc, 0x4b, 0xbc, 0x00, 0x00, 0x00
This does not have the locally administered bit set. Should it? Or is
this and address from your OUI?
> +static void ethernet_set_rx_mode(struct net_device *ndev)
> +{
> + if (ndev) {
How can ndev be NULL?
> +++ b/drivers/net/ethernet/sunplus/sp_hal.c
> @@ -0,0 +1,331 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright Sunplus Technology Co., Ltd.
> + * All rights reserved.
> + */
> +
> +#include <linux/iopoll.h>
> +#include "sp_hal.h"
> +
> +void hal_mac_stop(struct sp_mac *mac)
I suggest you avoid any references to hal. It makes people think you
have ported a driver from some other operating system and then put a
layer of code on top of it. That is not how you do it in Linux. This
is a Linux driver, nothing else.
> +void hal_mac_reset(struct sp_mac *mac)
> +{
> +}
> +
Should not exist.
> +void hal_mac_addr_set(struct sp_mac *mac)
> +{
> + struct sp_common *comm = mac->comm;
> + u32 reg;
> +
> + // Write MAC address.
> + writel(mac->mac_addr[0] + (mac->mac_addr[1] << 8),
> + comm->sp_reg_base + SP_W_MAC_15_0);
> + writel(mac->mac_addr[2] + (mac->mac_addr[3] << 8) + (mac->mac_addr[4] << 16) +
> + (mac->mac_addr[5] << 24), comm->sp_reg_base + SP_W_MAC_47_16);
> +
> + // Set aging=1
> + writel((mac->cpu_port << 10) + (mac->vlan_id << 7) + (1 << 4) + 0x1,
> + comm->sp_reg_base + SP_WT_MAC_AD0);
Is this actually adding an entry into the address translation table?
If so, make this clear in the function name. You are not setting the
MAC address, you are just adding a static forwarding entry.
> +
> + // Wait for completing.
> + do {
> + reg = readl(comm->sp_reg_base + SP_WT_MAC_AD0);
> + ndelay(10);
> + netdev_dbg(mac->ndev, "wt_mac_ad0 = %08x\n", reg);
> + } while ((reg & (0x1 << 1)) == 0x0);
> +
> + netdev_dbg(mac->ndev, "mac_ad0 = %08x, mac_ad = %08x%04x\n",
> + readl(comm->sp_reg_base + SP_WT_MAC_AD0),
> + readl(comm->sp_reg_base + SP_W_MAC_47_16),
> + readl(comm->sp_reg_base + SP_W_MAC_15_0) & 0xffff);
> +}
> +void hal_rx_mode_set(struct net_device *ndev)
> +{
> + struct sp_mac *mac = netdev_priv(ndev);
> + struct sp_common *comm = mac->comm;
> + u32 mask, reg, rx_mode;
> +
> + netdev_dbg(ndev, "ndev->flags = %08x\n", ndev->flags);
> +
> + mask = (mac->lan_port << 2) | (mac->lan_port << 0);
> + reg = readl(comm->sp_reg_base + SP_CPU_CNTL);
> +
> + if (ndev->flags & IFF_PROMISC) { /* Set promiscuous mode */
> + // Allow MC and unknown UC packets
> + rx_mode = (mac->lan_port << 2) | (mac->lan_port << 0);
> + } else if ((!netdev_mc_empty(ndev) && (ndev->flags & IFF_MULTICAST)) ||
> + (ndev->flags & IFF_ALLMULTI)) {
> + // Allow MC packets
> + rx_mode = (mac->lan_port << 2);
> + } else {
> + // Disable MC and unknown UC packets
> + rx_mode = 0;
> + }
> +
> + writel((reg & (~mask)) | ((~rx_mode) & mask), comm->sp_reg_base + SP_CPU_CNTL);
> + netdev_dbg(ndev, "cpu_cntl = %08x\n", readl(comm->sp_reg_base + SP_CPU_CNTL));
This looks like it belongs in the ethtool code.
> +int hal_mdio_access(struct sp_mac *mac, u8 op_cd, u8 phy_addr, u8 reg_addr, u32 wdata)
> +{
> + struct sp_common *comm = mac->comm;
> + u32 val, ret;
> +
> + writel((wdata << 16) | (op_cd << 13) | (reg_addr << 8) | phy_addr,
> + comm->sp_reg_base + SP_PHY_CNTL_REG0);
> +
> + ret = read_poll_timeout(readl, val, val & op_cd, 10, 1000, 1,
> + comm->sp_reg_base + SP_PHY_CNTL_REG1);
> + if (ret == 0)
> + return val >> 16;
> + else
> + return ret;
> +}
Should go with the other mdio code.
> +void hal_phy_addr(struct sp_mac *mac)
> +{
> + struct sp_common *comm = mac->comm;
> + u32 reg;
> +
> + // Set address of phy.
> + reg = readl(comm->sp_reg_base + SP_MAC_FORCE_MODE);
> + reg = (reg & (~(0x1f << 16))) | ((mac->phy_addr & 0x1f) << 16);
> + if (mac->next_ndev) {
> + struct net_device *ndev2 = mac->next_ndev;
> + struct sp_mac *mac2 = netdev_priv(ndev2);
> +
> + reg = (reg & (~(0x1f << 24))) | ((mac2->phy_addr & 0x1f) << 24);
> + }
> + writel(reg, comm->sp_reg_base + SP_MAC_FORCE_MODE);
> +}
As i said before, the hardware never directly communicates with the
PHY. So you can remove this.
> +static void port_status_change(struct sp_mac *mac)
> +{
> + u32 reg;
> + struct net_device *ndev = mac->ndev;
> +
> + reg = read_port_ability(mac);
> + if (!netif_carrier_ok(ndev) && (reg & PORT_ABILITY_LINK_ST_P0)) {
> + netif_carrier_on(ndev);
phylib should be handling the carrier for you.
> + if (mac->next_ndev) {
> + struct net_device *ndev2 = mac->next_ndev;
> +
> + if (!netif_carrier_ok(ndev2) && (reg & PORT_ABILITY_LINK_ST_P1)) {
> + netif_carrier_on(ndev2);
> + netif_start_queue(ndev2);
> + } else if (netif_carrier_ok(ndev2) && !(reg & PORT_ABILITY_LINK_ST_P1)) {
> + netif_carrier_off(ndev2);
> + netif_stop_queue(ndev2);
> + }
Looks very odd. The two netdev should be independent.
> diff --git a/drivers/net/ethernet/sunplus/sp_mdio.c b/drivers/net/ethernet/sunplus/sp_mdio.c
> new file mode 100644
> index 0000000..f6a7e64
> --- /dev/null
> +++ b/drivers/net/ethernet/sunplus/sp_mdio.c
> @@ -0,0 +1,90 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright Sunplus Technology Co., Ltd.
> + * All rights reserved.
> + */
> +
> +#include "sp_mdio.h"
> +
> +u32 mdio_read(struct sp_mac *mac, u32 phy_id, u16 regnum)
> +{
> + int ret;
> +
> + ret = hal_mdio_access(mac, MDIO_READ_CMD, phy_id, regnum, 0);
> + if (ret < 0)
> + return -EOPNOTSUPP;
> +
> + return ret;
> +}
> +
> +u32 mdio_write(struct sp_mac *mac, u32 phy_id, u32 regnum, u16 val)
> +{
> + int ret;
> +
> + ret = hal_mdio_access(mac, MDIO_WRITE_CMD, phy_id, regnum, val);
> + if (ret < 0)
> + return -EOPNOTSUPP;
> +
> + return 0;
> +}
> +
> +static int mii_read(struct mii_bus *bus, int phy_id, int regnum)
> +{
> + struct sp_mac *mac = bus->priv;
What happened about my request to return -EOPNOTSUPP for C45 requests?
Andrew
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