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Message-Id: <1184491016.3140.52.camel@roc-laptop>
Date: Sun, 15 Jul 2007 17:16:56 +0800
From: Bryan Wu <bryan.wu@...log.com>
To: Michael Buesch <mb@...sch.de>
Cc: bryan.wu@...log.com, Jeff Garzik <jeff@...zik.org>,
LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/3] Blackfin ethernet driver: on chip ethernet MAC
controller driver
On Sat, 2007-07-14 at 21:38 +0200, Michael Buesch wrote:
> On Saturday 14 July 2007 20:49:53 Bryan Wu wrote:
> > +#if defined(CONFIG_BFIN_MAC_USE_L1)
> > +# define bfin_mac_alloc(dma_handle, size) l1_data_sram_zalloc(size)
> > +# define bfin_mac_free(dma_handle, ptr) l1_data_sram_free(ptr)
> > +#else
> > +# define bfin_mac_alloc(dma_handle, size) \
> > + dma_alloc_coherent(NULL, size, dma_handle, GFP_DMA)
>
> You shouldn't be using GFP_DMA here (that's only for legacy ISA-DMA
> memory), but one of GFP_KERNEL or GFP_ATOMIC.
>
Yes, It should be. Actually, Blackfin dma_alloc_coherent doesn't use the
GFP_DMA flags.
Just for keepping API compatible, I will change it to GFP_KERNEL.
> > +# define bfin_mac_free(dma_handle, ptr) \
> > + dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
> > +#endif
> > +
>
> > +/* pointers to maintain transmit list */
> > +static struct net_dma_desc_tx *tx_list_head;
> > +static struct net_dma_desc_tx *tx_list_tail;
> > +static struct net_dma_desc_rx *rx_list_head;
> > +static struct net_dma_desc_rx *rx_list_tail;
> > +static struct net_dma_desc_rx *current_rx_ptr;
> > +static struct net_dma_desc_tx *current_tx_ptr;
> > +static struct net_dma_desc_tx *tx_desc;
> > +static struct net_dma_desc_rx *rx_desc;
>
> Hm, from this I guess only one of these devices is possible
> at a time in the system?
>
> > +static int desc_list_init(void)
> > +{
> > + struct net_dma_desc_tx *tmp_desc_tx;
> > + struct net_dma_desc_rx *tmp_desc_rx;
> > + int i;
> > + struct sk_buff *new_skb;
> > +#if !defined(CONFIG_BFIN_MAC_USE_L1)
> > + dma_addr_t dma_handle;
> > +#endif
> > +
> > + tx_desc =
> > + bfin_mac_alloc(&dma_handle,
> > + sizeof(struct net_dma_desc_tx) *
> > + CONFIG_BFIN_TX_DESC_NUM);
> > + if (tx_desc == NULL)
> > + goto init_error;
> > +
> > + rx_desc =
> > + bfin_mac_alloc(&dma_handle,
> > + sizeof(struct net_dma_desc_rx) *
> > + CONFIG_BFIN_RX_DESC_NUM);
>
> You are overriding and throwing dma_handle away, here.
> You might need it later for freeing. (and maybe for other
> purposes, too, like writing the address to a device register?)
>
You review very carelly, thanks.
In current Blackfin DMA allocation/free, the return value from
bfin_mac_alloc() is used as the dma_handle, here it is the
tx_desc/rx_desc.
The "dma_handle" is useless in the following code.
> > + if (rx_desc == NULL)
> > + goto init_error;
> > +
> > + /* init tx_list */
> > + for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
> > +
> > + tmp_desc_tx = tx_desc + i;
> > +
> > + if (i == 0) {
> > + tx_list_head = tmp_desc_tx;
> > + tx_list_tail = tmp_desc_tx;
> > + }
> > +
> > + tmp_desc_tx->desc_a.start_addr =
> > + (unsigned long)tmp_desc_tx->packet;
> > + tmp_desc_tx->desc_a.x_count = 0;
> > + /* disabled */
> > + tmp_desc_tx->desc_a.config.b_DMA_EN = 0;
> > + /* read from memory */
> > + tmp_desc_tx->desc_a.config.b_WNR = 0;
> > + /* wordsize is 32 bits */
> > + tmp_desc_tx->desc_a.config.b_WDSIZE = 2;
> > + /* 6 half words is desc size. */
> > + tmp_desc_tx->desc_a.config.b_NDSIZE = 6;
> > + /* large desc flow */
> > + tmp_desc_tx->desc_a.config.b_FLOW = 7;
> > + tmp_desc_tx->desc_a.next_dma_desc = &(tmp_desc_tx->desc_b);
> > +
> > + tmp_desc_tx->desc_b.start_addr =
> > + (unsigned long)(&(tmp_desc_tx->status));
> > + tmp_desc_tx->desc_b.x_count = 0;
> > + /* enabled */
> > + tmp_desc_tx->desc_b.config.b_DMA_EN = 1;
> > + /* write to memory */
> > + tmp_desc_tx->desc_b.config.b_WNR = 1;
> > + /* wordsize is 32 bits */
> > + tmp_desc_tx->desc_b.config.b_WDSIZE = 2;
> > + /* disable interrupt */
> > + tmp_desc_tx->desc_b.config.b_DI_EN = 0;
> > + tmp_desc_tx->desc_b.config.b_NDSIZE = 6;
> > + /* stop mode */
> > + tmp_desc_tx->desc_b.config.b_FLOW = 7;
> > + tmp_desc_tx->skb = NULL;
> > + tx_list_tail->desc_b.next_dma_desc = &(tmp_desc_tx->desc_a);
> > + tx_list_tail->next = tmp_desc_tx;
> > +
> > + tx_list_tail = tmp_desc_tx;
> > + }
> > + tx_list_tail->next = tx_list_head; /* tx_list is a circle */
> > + tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a);
> > + current_tx_ptr = tx_list_head;
> > +
> > + /* init rx_list */
> > + for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
> > +
> > + tmp_desc_rx = rx_desc + i;
> > +
> > + if (i == 0) {
> > + rx_list_head = tmp_desc_rx;
> > + rx_list_tail = tmp_desc_rx;
> > + }
> > +
> > + /* allocat a new skb for next time receive */
> > + new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
> > + if (!new_skb) {
> > + printk(KERN_NOTICE CARDNAME
> > + ": init: low on mem - packet dropped\n");
> > + goto init_error;
> > + }
> > + skb_reserve(new_skb, 2);
> > + tmp_desc_rx->skb = new_skb;
> > + /* since RXDWA is enabled */
> > + tmp_desc_rx->desc_a.start_addr =
> > + (unsigned long)new_skb->data - 2;
> > + tmp_desc_rx->desc_a.x_count = 0;
> > + /* enabled */
> > + tmp_desc_rx->desc_a.config.b_DMA_EN = 1;
> > + /* Write to memory */
> > + tmp_desc_rx->desc_a.config.b_WNR = 1;
> > + /* wordsize is 32 bits */
> > + tmp_desc_rx->desc_a.config.b_WDSIZE = 2;
> > + /* 6 half words is desc size. */
> > + tmp_desc_rx->desc_a.config.b_NDSIZE = 6;
> > + /* large desc flow */
> > + tmp_desc_rx->desc_a.config.b_FLOW = 7;
> > + tmp_desc_rx->desc_a.next_dma_desc = &(tmp_desc_rx->desc_b);
> > +
> > + tmp_desc_rx->desc_b.start_addr =
> > + (unsigned long)(&(tmp_desc_rx->status));
> > + tmp_desc_rx->desc_b.x_count = 0;
> > + /* enabled */
> > + tmp_desc_rx->desc_b.config.b_DMA_EN = 1;
> > + /* Write to memory */
> > + tmp_desc_rx->desc_b.config.b_WNR = 1;
> > + /* wordsize is 32 bits */
> > + tmp_desc_rx->desc_b.config.b_WDSIZE = 2;
> > + tmp_desc_rx->desc_b.config.b_NDSIZE = 6;
> > + /* enable interrupt */
> > + tmp_desc_rx->desc_b.config.b_DI_EN = 1;
> > + /* large mode */
> > + tmp_desc_rx->desc_b.config.b_FLOW = 7;
> > + rx_list_tail->desc_b.next_dma_desc = &(tmp_desc_rx->desc_a);
> > +
> > + rx_list_tail->next = tmp_desc_rx;
> > + rx_list_tail = tmp_desc_rx;
> > + }
> > + rx_list_tail->next = rx_list_head; /* rx_list is a circle */
> > + rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
> > + current_rx_ptr = rx_list_head;
> > +
> > + return 0;
> > +
> > +init_error:
> > + desc_list_free();
> > + printk(KERN_ERR CARDNAME ": kmalloc failed\n");
> > + return -ENOMEM;
> > +}
> > +
> > +static void desc_list_free(void)
> > +{
> > + struct net_dma_desc_rx *tmp_desc_rx;
> > + struct net_dma_desc_tx *tmp_desc_tx;
> > + int i;
> > +#if !defined(CONFIG_BFIN_MAC_USE_L1)
> > + dma_addr_t dma_handle = 0;
> > +#endif
> > +
> > + if (tx_desc != NULL) {
> > + tmp_desc_tx = tx_list_head;
> > + for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
> > + if (tmp_desc_tx != NULL) {
> > + if (tmp_desc_tx->skb) {
> > + dev_kfree_skb(tmp_desc_tx->skb);
> > + tmp_desc_tx->skb = NULL;
> > + }
> > +
> > + }
> > + tmp_desc_tx = tmp_desc_tx->next;
> > + }
> > + bfin_mac_free(dma_handle, tx_desc);
>
> dma_handle will always be 0 here. I guess that's a bug.
> Also see my comment on the alloc code, above.
>
Yes, dma_handle is not used, while tx_desc/rx_desc is.
> > + }
> > +
> > + if (rx_desc != NULL) {
> > + tmp_desc_rx = rx_list_head;
> > + for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
> > + if (tmp_desc_rx != NULL) {
> > + if (tmp_desc_rx->skb) {
> > + dev_kfree_skb(tmp_desc_rx->skb);
> > + tmp_desc_rx->skb = NULL;
> > + }
> > + }
> > + tmp_desc_rx = tmp_desc_rx->next;
> > + }
> > + bfin_mac_free(dma_handle, rx_desc);
>
> Same here.
>
> > +/* Wait until the previous MDC/MDIO transaction has completed */
> > +static void poll_mdc_done(void)
> > +{
> > + /* poll the STABUSY bit */
> > + while ((bfin_read_EMAC_STAADD()) & STABUSY) {
> > + };
>
> Please add a timeout here, as this could loop forever in case of
> slightly faulty hardware (or firmware, or whatever).
> It's good practice to add a timeout of say 5 seconds to such loops.
> You also might want to sleep between checks (dunno if this is called
> in atomic, though), so an mdelay(10) or something might be desired.
>
>
OK, timeout should be added.
>
> > +/* set up the phy */
> > +static void bf537mac_setphy(struct net_device *dev)
> > +{
> > + u16 phydat;
> > + u32 sysctl;
> > + struct bf537mac_local *lp = netdev_priv(dev);
> > +
> > + pr_debug("start settting up phy\n");
>
> settting :)
>
> > + /* Program PHY registers */
> > + phydat = 0;
>
> No need to zero phydat out, here.
>
> > + /* issue a reset */
> > + raw_write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, 0x8000);
> > +
> > + /* wait half a second */
> > + udelay(500);
>
> First: 500usec != 1/2sec
> Second: 500usec is a lot. You might want to use msleep(1)
> or msleep(500), if you _really_ want to sleep half a sec.
>
> > + phydat = read_phy_reg(lp->PhyAddr, PHYREG_MODECTL);
> > +
> > + /* advertise flow control supported */
> > + phydat = read_phy_reg(lp->PhyAddr, PHYREG_ANAR);
> > + phydat |= (1 << 10);
> > + write_phy_reg(lp->PhyAddr, PHYREG_ANAR, phydat);
> > +
> > + phydat = 0;
> > + if (lp->Negotiate) {
> > + phydat |= 0x1000; /* enable auto negotiation */
> > + } else {
> > + if (lp->FullDuplex) {
> > + phydat |= (1 << 8); /* full duplex */
> > + } else {
> > + phydat &= (~(1 << 8)); /* half duplex */
> > + }
> > + if (!lp->Port10) {
> > + phydat |= (1 << 13); /* 100 Mbps */
> > + } else {
> > + phydat &= (~(1 << 13)); /* 10 Mbps */
> > + }
> > + }
> > +
> > + if (lp->Loopback) {
> > + phydat |= (1 << 14); /* enable TX->RX loopback */
> > +#ifdef DRV_DEBUG
> > + write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, phydat);
> > +#endif
> > + }
> > +
> > + write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, phydat);
> > + udelay(500);
>
> See my comment above, about the delay vs sleep.
>
> > + phydat = read_phy_reg(lp->PhyAddr, PHYREG_MODECTL);
> > + /* check for SMSC PHY */
> > + if ((read_phy_reg(lp->PhyAddr, PHYREG_PHYID1) == 0x7) &&
> > + ((read_phy_reg(lp->PhyAddr, PHYREG_PHYID2) & 0xfff0) == 0xC0A0)) {
>
> Hm, lots of magic values in this function. You should probably
> use #define for better readability.
>
This is some magic code for PHY ID. In the future, we will rewrite some
code based on kernel phy abstraction layer to support more phy device.
> > + /*
> > + * we have SMSC PHY so reqest interrupt
> > + * on link down condition
> > + */
> > +
> > + /* enable interrupts */
> > + write_phy_reg(lp->PhyAddr, 30, 0x0ff);
>
> -
> > + /* enable PHY_INT */
> > + sysctl = bfin_read_EMAC_SYSCTL();
> > + sysctl |= 0x1;
> > +#ifdef DRV_DEBUG
>
> Seems like you can move this #ifdef three lines up.
>
> > + bfin_write_EMAC_SYSCTL(sysctl);
> > +#endif
> > + }
> > +}
> > +
> > +/**************************************************************************/
> > +void setup_system_regs(struct net_device *dev)
> > +{
> > + int PHYADDR;
>
> Lowercase, please.
>
> > + unsigned short sysctl, phydat;
> > + u32 opmode;
> > + struct bf537mac_local *lp = netdev_priv(dev);
> > + int count = 0;
> > +
> > + PHYADDR = lp->PhyAddr;
> > +
> > + /* Enable PHY output */
> > + if (!(bfin_read_VR_CTL() & PHYCLKOE))
> > + bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
> > +
> > + /* MDC = 2.5 MHz */
> > + sysctl = SET_MDCDIV(24);
> > + /* Odd word alignment for Receive Frame DMA word */
> > + /* Configure checksum support and rcve frame word alignment */
> > +#if defined(BFIN_MAC_CSUM_OFFLOAD)
> > + sysctl |= RXDWA | RXCKS;
> > +#else
> > + sysctl |= RXDWA;
> > +#endif
> > + bfin_write_EMAC_SYSCTL(sysctl);
> > + /* auto negotiation on */
> > + /* full duplex */
> > + /* 100 Mbps */
> > + phydat = PHY_ANEG_EN | PHY_DUPLEX | PHY_SPD_SET;
> > + write_phy_reg(PHYADDR, PHYREG_MODECTL, phydat);
> > +
> > + /* test if full duplex supported */
> > + do {
> > + msleep(100);
> > + phydat = read_phy_reg(PHYADDR, PHYREG_MODESTAT);
> > + if (count > 30) {
> > + printk(KERN_NOTICE CARDNAME ": Link is down\n");
> > + printk(KERN_NOTICE CARDNAME
> > + "please check your network connection\n");
> > + break;
> > + }
> > + count++;
> > + } while (!(phydat & 0x0004));
> > +
> > + phydat = read_phy_reg(PHYADDR, PHYREG_ANLPAR);
> > +
> > + if ((phydat & 0x0100) || (phydat & 0x0040)) {
> > + opmode = FDMODE;
> > + } else {
> > + opmode = 0;
> > + printk(KERN_INFO CARDNAME
> > + ": Network is set to half duplex\n");
> > + }
> > +
> > +#if defined(CONFIG_BFIN_MAC_RMII)
> > + opmode |= RMII; /* For Now only 100MBit are supported */
> > +#endif
> > +
> > + bfin_write_EMAC_OPMODE(opmode);
> > +
> > +#ifdef DRV_DEBUG
> > + bfin_write_EMAC_MMC_CTL(RSTC | CROLL | MMCE);
> > +#endif
> > + bfin_write_EMAC_MMC_CTL(RSTC | CROLL);
>
> Is it desired to overwrite it here, or is this a missing #else?
>
> > +void setup_mac_addr(u8 * mac_addr)
> > +{
> > + /* this depends on a little-endian machine */
> > + bfin_write_EMAC_ADDRLO(*(u32 *) & mac_addr[0]);
> > + bfin_write_EMAC_ADDRHI(*(u16 *) & mac_addr[4]);
>
> So why not properly code it with leXX_to_cpu?
> It's for free, if it's not needed on your platform.
>
> > +}
> > +
> > +static void adjust_tx_list(void)
> > +{
> > + if (tx_list_head->status.status_word != 0
> > + && current_tx_ptr != tx_list_head) {
> > + goto adjust_head; /* released something, just return; */
> > + }
> > +
> > + /*
> > + * if nothing released, check wait condition
> > + * current's next can not be the head,
> > + * otherwise the dma will not stop as we want
> > + */
> > + if (current_tx_ptr->next->next == tx_list_head) {
> > + while (tx_list_head->status.status_word == 0) {
> > + udelay(10);
> > + if (tx_list_head->status.status_word != 0
> > + || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
> > + goto adjust_head;
> > + }
>
> Timeout?
>
> > + }
> > + if (tx_list_head->status.status_word != 0) {
> > + goto adjust_head;
> > + }
> > + }
>
> To me it looks like you are accessing DMA memory without any
> DMA syncing here. Maybe that's not needed on your platform
> and you can access DMA memory directly there, but it's ugly
> and code that properly uses the syncing functions is _much_
> easier to understand.
>
> > + return;
> > +
> > +adjust_head:
> > + do {
> > + tx_list_head->desc_a.config.b_DMA_EN = 0;
> > + tx_list_head->status.status_word = 0;
> > + if (tx_list_head->skb) {
> > + dev_kfree_skb(tx_list_head->skb);
> > + tx_list_head->skb = NULL;
> > + } else {
> > + printk(KERN_ERR CARDNAME
> > + ": no sk_buff in a transmitted frame!\n");
> > + }
> > + tx_list_head = tx_list_head->next;
> > + } while (tx_list_head->status.status_word != 0
> > + && current_tx_ptr != tx_list_head);
> > + return;
> > +
> > +}
> > +
>
> > +static void bf537mac_rx(struct net_device *dev)
> > +{
> > + struct sk_buff *skb, *new_skb;
> > + struct bf537mac_local *lp = netdev_priv(dev);
> > + unsigned short len;
> > +
> > + /* allocat a new skb for next time receive */
>
> Typo, "allocat"
>
> > + skb = current_rx_ptr->skb;
> > + new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
> > + if (!new_skb) {
> > + printk(KERN_NOTICE CARDNAME
> > + ": rx: low on mem - packet dropped\n");
> > + lp->stats.rx_dropped++;
> > + goto out;
> > + }
> > + /* reserve 2 bytes for RXDWA padding */
> > + skb_reserve(new_skb, 2);
> > + current_rx_ptr->skb = new_skb;
> > + current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
> > +
> > +#ifdef DRV_DEBUG
> > + int i;
>
> This generates a GCC warning.
>
> > + if (len >= 64) {
> > + for (i = 0; i < len; i++) {
> > + printk(KERN_DEBUG "%.2x-", ((unsigned char *)pkt)[i]);
>
> Does this even compile? I don't see where "pkt" is defined.
>
> > + if (((i % 8) == 0) && (i != 0))
> > + printk(KERN_DEBUG "\n");
> > + }
> > + printk(KERN_DEBUG"\n");
>
> One more tab indention and a space between KERN_DEBUG and "\n", please.
>
> > +static void bf537mac_reset(void)
> > +{
> > + unsigned int opmode;
> > +
> > + opmode = bfin_read_EMAC_OPMODE();
> > + opmode &= (~RE);
> > + opmode &= (~TE);
> > + /* Turn off the EMAC */
> > + bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() & opmode);
>
> bfin_write_EMAC_OPMODE(opmode);
> would have the same effect, no?
>
> > +static int __init bf537mac_probe(struct net_device *dev)
> > +{
> > + struct bf537mac_local *lp = netdev_priv(dev);
> > + int retval;
> > +
> > + /* Grab the MAC address in the MAC */
> > + *(u32 *) (&(dev->dev_addr[0])) = bfin_read_EMAC_ADDRLO();
> > + *(u16 *) (&(dev->dev_addr[4])) = (u16) bfin_read_EMAC_ADDRHI();
>
> Endianess broken.
>
> > + setup_mac_addr(dev->dev_addr);
> > +
> > + /* Fill in the fields of the device structure with ethernet values. */
> > + ether_setup(dev);
> > +
> > + dev->open = bf537mac_open;
> > + dev->stop = bf537mac_close;
> > + dev->hard_start_xmit = bf537mac_hard_start_xmit;
> > + dev->tx_timeout = bf537mac_timeout;
> > + dev->get_stats = bf537mac_query_statistics;
> > + dev->set_multicast_list = bf537mac_set_multicast_list;
> > +#ifdef DVR_DEBUG
>
> Typo, "DVR".
> But why only use ethtool when debugging?
>
> > + dev->ethtool_ops = &bf537mac_ethtool_ops;
> > +#endif
> > +#ifdef CONFIG_NET_POLL_CONTROLLER
> > + dev->poll_controller = bf537mac_poll;
> > +#endif
>
> > + /* Enable PHY output early */
> > + if (!(bfin_read_VR_CTL() & PHYCLKOE))
> > + bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
> > +
> > + retval = register_netdev(dev);
> > + if (retval == 0) {
> > + /* now, print out the card info, in a short format.. */
> > + printk(KERN_INFO "Blackfin mac net device registered\n");
> > + }
>
> Unwind the allocations above, if registering fails.
>
In fact, it is safe. Because if registering fails, bf537mac_probe will
return none zero to bfin_mac_probe which will do free_netdev.
> > +
> > +err_out:
> > + return retval;
> > +}
>
>
> > +struct dma_config_reg {
> > + unsigned short b_DMA_EN:1; /* Bit 0 : DMA Enable */
> > + unsigned short b_WNR:1; /* Bit 1 : DMA Direction */
> > + unsigned short b_WDSIZE:2; /* Bit 2 & 3 : DMA Tranfer Word size */
> > + unsigned short b_DMA2D:1; /* Bit 4 : DMA Mode 2D or 1D */
> > + unsigned short b_RESTART:1; /* Bit 5 : Retain the FIFO */
> > + unsigned short b_DI_SEL:1; /* Bit 6 : Data Interrupt Timing Select */
> > + unsigned short b_DI_EN:1; /* Bit 7 : Data Interrupt Enable */
> > + unsigned short b_NDSIZE:4; /* Bit 8 to 11 : Flex descriptor Size */
> > + unsigned short b_FLOW:3; /* Bit 12 to 14 : FLOW */
> > +};
>
> This is most likely not endianess safe.
>
I will remove the bitfield code first as Jeff described. Mike is right,
as this is on-chip mac controller, it is always little endian.
A new version driver will be sent later for review.
Thanks a lot
- Bryan Wu
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