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Message-ID: <46421C2C.3050603@pmc-sierra.com>
Date: Wed, 9 May 2007 12:08:28 -0700
From: Marc St-Jean <Marc_St-Jean@...-sierra.com>
To: Jeff Garzik <jeff@...zik.org>
Cc: Marc St-Jean <stjeanma@...-sierra.com>, netdev@...r.kernel.org,
akpm@...ux-foundation.org, linux-mips@...ux-mips.org
Subject: Re: [PATCH 10/12] drivers: PMC MSP71xx ethernet driver
Thanks for the feedback Jeff. I have made all modifications but I have one
question regarding the SKB recycling.
Removing the backwards compatibility for the linux 2.4 eliminated the
badness in mspeth_skb_headerinit(). However there is still some SKB code
in mspeth_alloc_skb(). You didn't specifically comment on that, is it
acceptable?
We are reluctant to remove the SKB recycling code as it provides a
significant performance improvement.
Marc
Jeff Garzik wrote:
> > +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
> > +#include <linux/dma-mapping.h>
> > +#include <linux/platform_device.h>
> > +#include <net/xfrm.h>
> > +#include <asm/cpu-features.h>
> > +#include <msp_regs.h>
> > +#include <msp_regops.h>
> > +#include <msp_prom.h>
> > +#include <msp_int.h>
> > +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
> > +#include <asm/r4kcache.h>
> > +#include <asm/brecis/prom.h>
> > +#include <asm/brecis/brecisint.h>
> > +#include <asm/brecis/brecisint.h>
> > +#include <asm/brecis/BrecisSysRegs.h>
> > +#include <brecis/msp.h>
> > +#endif /* LINUX_VERSION_CODE */
> > +
> > +#include "pmcmspeth.h"
> > +
> >
> +/**************************************************************************
>
> > + * The name of the card. Is used for messages and in the requests for
> > + * io regions, irqs and dma channels, versions, etc. Also, various
> other
> > + * identifying character constants.
> > + */
> > +static const char cardname[] = "pmcmspeth";
> > +
> >
> +/**************************************************************************
>
> > + * List of PHYs. Each MAC will have a certain number (maybe zero)
> > + * PHYs hanging off the MDIO interface.
> > + */
> > +static struct mspeth_phy *root_phy_dev = NULL;
> > +
> > +/* Debugging flags */
> > +static unsigned int mspeth_debug = MSPETH_DEBUG;
>
> use netif_msg_init() and the bitmapped message flags. grep for
> 'netif_msg_' and 'msg_enable' in various drivers.
>
>
> >
> +/**************************************************************************
>
> > + * Function prototypes
> > + */
> > +
> > +/* Functions that get called by upper layers */
> > +static int mspeth_open(struct net_device *dev);
> > +static int mspeth_send_packet(struct sk_buff *skb,
> > + struct net_device *dev);
> > +static void mspeth_tx_timeout(struct net_device *dev);
> > +static void mspeth_hard_restart_bh(unsigned long dev_addr);
> > +static int mspeth_close(struct net_device *dev);
> > +static struct net_device_stats *mspeth_get_stats(struct net_device
> *dev);
> > +static void mspeth_set_multicast_list(struct net_device *dev);
> > +
> > +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
> > +static irqreturn_t mspeth_interrupt(int irq, void *dev_id);
> > +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
> > +static void mspeth_interrupt(int irq, void *dev_id, struct pt_regs
> *regs);
> > +#endif
>
> remove all kernel compat ifdefs
>
>
>
> > + /* protect access with spin lock */
> > + spin_lock_irqsave(&(phyptr->lock), flags);
> > +
> > + while (__raw_readl(phyptr->memaddr + MSPPHY_MII_CTRL) &
> > + MD_CA_BUSY_BIT) {;}
> > + __raw_writel(MD_CA_BUSY_BIT | phyptr->phyaddr << 5 | phy_reg,
> > + phyptr->memaddr + MSPPHY_MII_CTRL);
> > + while (__raw_readl(phyptr->memaddr + MSPPHY_MII_CTRL) &
> > + MD_CA_BUSY_BIT) {;}
> > + data = __raw_readl(phyptr->memaddr + MSPPHY_MII_DATA);
>
> no infinite loops allowed
>
>
> > + /* unlock */
> > + spin_unlock_irqrestore(&(phyptr->lock), flags);
> > +
> > + return data & 0xffff;
> > +}
> > +
> > +static void
> > +mspphy_write(struct mspeth_phy *phyptr, int phy_reg, u32 data)
> > +{
> > + unsigned long flags;
> > +
> > + if (phyptr == NULL) {
> > + printk(KERN_WARNING "MSPETH(mspphy_write): "
> > + "Cannot write to a NULL PHY!\n");
>
> This is a BUG_ON() condition
>
>
> > + /* protect access with spin lock */
> > + spin_lock_irqsave(&(phyptr->lock), flags);
>
> remove extra parens
>
>
> > + while (__raw_readl(phyptr->memaddr + MSPPHY_MII_CTRL) &
> > + MD_CA_BUSY_BIT) {;}
> > + __raw_writel(data, phyptr->memaddr + MSPPHY_MII_DATA);
> > + __raw_writel(MD_CA_BUSY_BIT | MD_CA_Wr |
> > + phyptr->phyaddr << 5 | phy_reg,
> > + phyptr->memaddr + MSPPHY_MII_CTRL);
> > + while (__raw_readl(phyptr->memaddr + MSPPHY_MII_CTRL) &
> > + MD_CA_BUSY_BIT) {;}
>
> no infinite loops
>
>
> > + /* unlock */
> > + spin_unlock_irqrestore(&(phyptr->lock), flags);
> > +}
> > +
> > +#ifdef CONFIG_MSPETH_SKB_RECYCLE
> > +/* initialise the recycle bin for skb */
> > +static void
> > +init_skbuff_bin(void)
> > +{
> > + spin_lock_init(&skb_bin.lock);
> > + skb_bin.recycle_max = RX_BUF_NUM * 4; /* max size of bin */
> > + skb_bin.recycle_count = 0;
> > + skb_bin.recycle_queue = NULL;
> > + skb_bin.user_count = 0;
> > +}
> > +
> > +/* free the skb's in recycle bin */
> > +static void
> > +free_skbuff_bin(void)
> > +{
> > + spin_lock_bh(&skb_bin.lock);
> > +
> > + /* check any skb's are present in the recycle bin */
> > + if (skb_bin.recycle_count > 0) {
> > + struct sk_buff *skb;
> > + while (skb_bin.recycle_queue != NULL ) {
> > + skb = skb_bin.recycle_queue->next;
> > + dev_kfree_skb_any(skb_bin.recycle_queue);
> > + skb_bin.recycle_queue = skb;
> > + }
> > + }
> > +
> > + /* reset fields */
> > + skb_bin.recycle_queue = NULL;
> > + skb_bin.recycle_count = 0;
> > +
> > + spin_unlock_bh(&skb_bin.lock);
> > +}
> > +
> > +inline static void
> > +mspeth_skb_headerinit(struct sk_buff *skb)
> > +{
> > + /* these are essential before init */
> > + dst_release(skb->dst);
> > +#ifdef CONFIG_XFRM
> > + secpath_put(skb->sp);
> > +#endif
> > +#ifdef CONFIG_NETFILTER
> > + nf_conntrack_put(skb->nfct);
> > +#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
> > + nf_conntrack_put_reasm(skb->nfct_reasm);
> > +#endif
> > +#ifdef CONFIG_BRIDGE_NETFILTER
> > + nf_bridge_put(skb->nf_bridge);
> > +#endif
> > +#endif /* CONFIG_NETFILTER */
> > +
> > + /* now initialise the skb . . . */
> > +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
> > + /* clear the members till skb->truesize */
> > + memset(skb, 0, offsetof(struct sk_buff, truesize));
> > +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
> > + skb->prev = NULL;
> > + skb->list = NULL;
> > + skb->sk = NULL;
> > + skb->stamp.tv_sec = 0;
> > +#ifdef CONFIG_BRECIS
> > + skb->stamp.tv_usec = 0;
> > +#endif /* CONFIG_BRECIS */
> > + skb->dev = NULL;
> > + skb->real_dev = NULL;
> > + skb->dst = NULL;
> > + memset(skb->cb, 0, sizeof(skb->cb));
> > + skb->pkt_type = PACKET_HOST;
> > + skb->priority = 0;
> > + skb->security = 0;
> > +
> > +#ifdef CONFIG_NETFILTER
> > + skb->nfmark = skb->nfcache = 0;
> > + skb->nfct = NULL;
> > +#ifdef CONFIG_NETFILTER_DEBUG
> > + skb->nf_debug = 0;
> > +#endif
> > +#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
> > + skb->nf_bridge = NULL;
> > +#endif
> > +#endif /* CONFIG_NETFILTER */
> > +#ifdef CONFIG_NET_SCHED
> > + skb->tc_index = 0;
> > +#endif
> > +#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
> > + skb->nfct_reasm = NULL;
> > +#endif
> > +#endif /* LINUX_VERSION_CODE */
> > +}
> > +#endif /* CONFIG_MSPETH_SKB_RECYCLE */
>
> Absolutely not. No. NAK. This is unmaintainable crap that does not
> belong in a driver at all.
>
> You should not be hand-initializing skbs.
>
>
> >
> +/**************************************************************************
>
> > + * Allocate and align a max length socket buffer for this device
> > + */
> > +inline static struct sk_buff *
> > +mspeth_alloc_skb(struct net_device *dev)
> > +{
> > + struct sk_buff *skb = NULL;
> > +
> > +#ifdef CONFIG_MSPETH_SKB_RECYCLE
> > + /* try to get an skb from the recycle bin */
> > + spin_lock_bh(&skb_bin.lock);
> > +
> > + /* check if the bin si empty */
> > + if (skb_bin.recycle_queue) {
> > + /* grab an skb from the bin */
> > + skb = skb_bin.recycle_queue;
> > + skb_bin.recycle_queue = skb->next;
> > +
> > + /* we have taken one, so reduce the count */
> > + skb_bin.recycle_count--;
> > + skb_bin.recycle_hits++;
> > + spin_unlock_bh(&skb_bin.lock);
> > +
> > + skb->next = NULL; /* must be set to NULL */
> > + skb->truesize = (skb->end - skb->head) +
> > + sizeof(struct sk_buff);
> > + atomic_set(&skb->users, 1);
> > +
> > + /* reset the payload pointers */
> > + skb->data = skb->head;
> > + skb->tail = skb->head;
> > +
> > + /* reset shared info fields */
> > + atomic_set(&(skb_shinfo(skb)->dataref), 1);
> > + skb_shinfo(skb)->nr_frags = 0;
> > +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
> > + skb_shinfo(skb)->gso_size = 0;
> > + skb_shinfo(skb)->gso_segs = 0;
> > +#endif
> > + skb_shinfo(skb)->frag_list = NULL;
> > +
> > + /* compliance with __dev_alloc_skb */
> > + skb_reserve(skb, NET_SKB_PAD);
> > + } else {
> > + /* no skb in bin */
> > + spin_unlock_bh(&skb_bin.lock);
> > + }
> > +#endif /* CONFIG_MSPETH_SKB_RECYCLE */
> > +
> > + if (skb == NULL) {
> > + /*
> > + * We need a bit more than an ethernet frame for the
> > + * aligment stuff so preallocate two more.
> > + */
> > + skb = dev_alloc_skb(MSP_END_BUFSIZE + 2);
> > +#ifdef CONFIG_MSPETH_SKB_RECYCLE
> > + skb_bin.recycle_misses++;
> > +#endif
> > + if (skb == NULL) {
> > + printk(KERN_WARNING "MSPETH(alloc_skb) %s: "
> > + "cannot allocate skb!\n", dev->name);
> > + return NULL;
> > + }
> > + }
> > +
> > + /*
> > + * Align and fill out fields specific to our device. Notice that
> > + * our device is smart about FCS etc ......
> > + */
> > + skb_reserve(skb, 2);
> > + skb->dev = dev;
> > + skb->ip_summed = CHECKSUM_NONE;
> > +
> > + return skb;
> > +}
> > +
> >
> +/**************************************************************************
>
> > + * Add the used skb to recycle bin or free it
> > + */
> > +inline static void
> > +mspeth_free_skb(struct sk_buff *skb)
> > +{
> > +#ifdef CONFIG_MSPETH_SKB_RECYCLE
> > + /*
> > + * First try to recycle the skb.
> > + * Check if the skb can be recycled.
> > + */
> > + if ((skb->end - skb->head) >= SKBUFF_RECYCLABLE_SIZE &&
> > + (!skb->destructor) &&
> > + (!skb->cloned) &&
> > + (atomic_dec_and_test(&skb->users))) {
> > + /* skb is recyclable */
> > + spin_lock_bh(&skb_bin.lock);
> > +
> > + /* check the bin has room to add our skb */
> > + if (likely(skb_bin.recycle_count < skb_bin.recycle_max)) {
> > + /* everything ok; go recycle it */
> > + /* prerequisite before adding to recycle bin */
> > + mspeth_skb_headerinit(skb);
> > +
> > + /* now we can add the skb to bin */
> > + skb->next = skb_bin.recycle_queue;
> > + skb_bin.recycle_queue = skb;
> > +
> > + /* we have one more skb in bin, increase the
> count */
> > + skb_bin.recycle_count++;
> > +
> > + spin_unlock_bh(&skb_bin.lock);
> > + return;
> > + } else {
> > + /* bin has no room */
> > + spin_unlock_bh(&skb_bin.lock);
> > + }
> > + }
> > +#endif /* CONFIG_MSPETH_SKB_RECYCLE */
> > +
> > + /* Can't add skb to recycle bin, so free it in normal way. */
> > + dev_kfree_skb_any(skb);
> > +}
> > +
> >
> +/**************************************************************************
>
> > + * Error reporting functions -- used for debugging mostly
> > + */
> > +static void
> > +dump_qdesc(struct q_desc *fd)
> > +{
> > + printk(KERN_INFO " q_desc(%p): %08x %08x %08x %08x\n",
> > + fd, fd->fd.FDNext, fd->fd.FDSystem,
> > + fd->fd.FDStat, fd->fd.FDCtl);
> > + printk(KERN_INFO " BD: %08x %08x\n",
> > + fd->bd.BuffData, fd->bd.BDCtl);
> > +}
> > +
> > +static void
> > +print_buf(char *add, int length)
> > +{
> > + int i;
> > + int len = length;
> > +
> > + printk(KERN_INFO "print_buf(%08x)(%x)\n",
> > + (unsigned int)add, length);
> > +
> > + if (len > 100)
> > + len = 100;
> > + for (i = 0; i < len; i++) {
> > + printk(KERN_INFO " %2.2X", (unsigned char)add[i]);
> > + if (!(i % 16))
> > + printk(KERN_INFO "\n");
> > + }
> > + printk(KERN_INFO "\n");
> > +}
> > +
> > +static void
> > +print_eth(int rx, char *add, int len)
> > +{
> > + int i;
> > + int lentyp;
> > +
> > + if (rx)
> > + printk(KERN_INFO "\n************************** RX packet "
> > + "0x%08x ****************************\n",
> (u32)add);
> > + else
> > + printk(KERN_INFO "\n************************** TX packet "
> > + "0x%08x ****************************\n",
> (u32)add);
> > +
> > + printk(KERN_INFO "---- ethernet ----\n");
> > + printk(KERN_INFO "==> dest: ");
> > + for (i = 0; i < 6; i++) {
> > + printk(KERN_INFO "%02x", (unsigned char)add[i]);
> > + printk((i < 5) ? KERN_INFO ":" : KERN_INFO "\n");
> > + }
> > +
> > + printk(KERN_INFO "==> src: ");
> > + for (i = 0; i < 6; i++) {
> > + printk(KERN_INFO "%02x", (unsigned char)add[i + 6]);
> > + printk((i < 5) ? KERN_INFO ":" : KERN_INFO "\n");
> > + }
> > + lentyp = ((unsigned char)add[12] << 8) | (unsigned char)add[13];
> > + if (lentyp <= 1500)
> > + printk(KERN_INFO "==> len: %d\n", lentyp);
> > + else if (lentyp > 1535)
> > + printk(KERN_INFO "==> type: 0x%04x\n", lentyp);
> > + else
> > + printk(KERN_INFO "==> ltyp: 0x%04x\n", lentyp);
> > +
> > + if (len > 0x100)
> > + len = 0x100;
> > +
> > + for (i = 0; i < ((u32)add & 0x0000000F); i++)
> > + printk(KERN_INFO " ");
> > + for (i = 0; i < len; i++, add++) {
> > + printk(KERN_INFO " %02x", *((unsigned char *)add));
> > + if (!(((u32)add + 1) % 16))
> > + printk(KERN_INFO "\n");
> > + }
> > + printk(KERN_INFO "\n");
> > +}
> > +
> > +/*
> > + * Used mainly for debugging unusual conditions signalled by a
> > + * fatal error interrupt (eg, IntBLEx). This function stops the
> transmit
> > + * and receive in an attempt to capture the true state of the queues
> > + * at the time of the interrupt.
> > + */
> > +#undef MSPETH_DUMP_QUEUES
> > +#ifdef MSPETH_DUMP_QUEUES
> > +static void
> > +dump_blist(struct bl_desc *fd)
> > +{
> > + int i;
> > +
> > + printk(KERN_INFO " bl_desc(%p): %08x %08x %08x %08x\n",
> > + fd, fd->fd.FDNext,
> > + fd->fd.FDSystem, fd->fd.FDStat, fd->fd.FDCtl);
> > + for (i = 0; i < RX_BUF_NUM << 1; i++)
> > + printk(KERN_INFO " BD #%d: %08x %08x\n",
> > + i, fd->bd[i].BuffData, fd->bd[i].BDCtl);
> > +}
> > +
> > +/* Catalog the received buffers numbers */
> > +static int rx_bdnums[2][RX_BUF_NUM << 2];
> > +static int rx_bdnums_ind[2] = {0, 0};
> > +static inline void
> > +catalog_rx_bdnum(int hwnum, int bdnum)
> > +{
> > + rx_bdnums_ind[hwnum] = (rx_bdnums_ind[hwnum] + 1) &
> > + ((RX_BUF_NUM << 2) - 1);
> > + rx_bdnums[hwnum][rx_bdnums_ind[hwnum]] = bdnum;
> > +}
> > +
> > +static void
> > +mspeth_dump_queues(struct net_device *dev)
> > +{
> > + struct mspeth_priv *lp = netdev_priv(dev);
> > + int unit = lp->unit;
> > + int i;
> > +
> > + /* Halt Xmit and Recv to preserve the state of queues */
> > + msp_write(lp, MSPETH_Rx_Ctl, msp_read(lp, MSPETH_Rx_Ctl) &
> ~Rx_RxEn);
> > + msp_write(lp, MSPETH_Tx_Ctl, msp_read(lp, MSPETH_Tx_Ctl) &
> ~Tx_En);
> > +
> > + /* Print receive queue */
> > + printk(KERN_INFO "Receive Queue\n");
> > + printk(KERN_INFO "=============\n\n");
> > + printk(KERN_INFO "rxfd_base = 0x%08x\n",
> > + (unsigned int) lp->rxfd_base);
> > + printk(KERN_INFO "rxfd_curr = 0x%08x\n",
> > + (unsigned int) lp->rxfd_curr);
> > + for (i = 0; i < RX_BUF_NUM; i++) {
> > + printk(KERN_INFO "%d:", i);
> > + dump_qdesc((struct q_desc *) &lp->rxfd_base[i]);
> > + }
> > +
> > + /* Print transmit queue */
> > + printk(KERN_INFO "\nTransmit Queue\n");
> > + printk(KERN_INFO "==============\n");
> > + printk(KERN_INFO "txfd_base = 0x%08x\n",
> > + (unsigned int) lp->txfd_base);
> > + printk(KERN_INFO "tx_head = %d, tx_tail = %d\n",
> > + lp->tx_head, lp->tx_tail);
> > + for (i = 0; i < TX_BUF_NUM; i++) {
> > + printk(KERN_INFO "%d:", i);
> > + dump_qdesc((struct q_desc *) &lp->txfd_base[i]);
> > + }
> > +
> > + /* Print the free buffer list */
> > + printk(KERN_INFO "\nFree Buffer List\n");
> > + printk(KERN_INFO "================\n");
> > + printk(KERN_INFO "blfd_ptr = 0x%08x\n", (unsigned int)
> lp->blfd_ptr);
> > + dump_blist(lp->blfd_ptr);
> > +
> > + /* Print the bdnum history and current index as a reference */
> > + printk(KERN_INFO "\nbdnum history\n");
> > + printk(KERN_INFO "=============\n");
> > + for (i = 0; i < RX_BUF_NUM; i++) {
> > + printk(KERN_INFO "\t%d\t%d\t%d\t%d\n",
> > + rx_bdnums[unit][4 * i],
> > + rx_bdnums[unit][4 * i + 1],
> > + rx_bdnums[unit][4 * i + 2],
> > + rx_bdnums[unit][4 * i + 3]);
> > + }
> > + printk(KERN_INFO "Current bdnum index: %d\n",
> rx_bdnums_ind[unit]);
> > +
> > + /* Re-enable Xmit/Recv */
> > + msp_write(lp, MSPETH_Rx_Ctl, msp_read(lp, MSPETH_Rx_Ctl) |
> Rx_RxEn);
> > + msp_write(lp, MSPETH_Tx_Ctl, msp_read(lp, MSPETH_Tx_Ctl) | Tx_En);
> > +}
> > +
> > +static void
> > +mspeth_dump_stats(struct net_device *dev)
> > +{
> > + struct mspeth_priv *lp = netdev_priv(dev);
> > +
> > + printk(KERN_INFO "Interface stats:\n");
> > + printk(KERN_INFO "\ttx_ints: %d\n", lp->lstats.tx_ints);
> > + printk(KERN_INFO "\trx_ints: %d\n", lp->lstats.rx_ints);
> > + printk(KERN_INFO "\ttx_full: %d\n", lp->lstats.tx_full);
> > + printk(KERN_INFO "\tfd_exha: %d\n", lp->lstats.fd_exha);
> > +}
> > +#else
> > +#define mspeth_dump_stats(a) do {} while (0)
> > +#define mspeth_dump_queues(a) do {} while (0)
> > +#define catalog_rx_bdnum(a, b) do {} while (0)
> > +#define dump_blist(a) do {} while (0)
> > +#endif /* MSPETH_DUMP_QUEUES */
> > +
> > +/*
> > + * Actual functions used in the driver are defined here. They should
> > + * all start with mspeth.
> > + */
> > +
> >
> +/**************************************************************************
>
> > + * Check for an mspeth ethernet device and return 0 if there is one.
> > + * Also a good time to fill out some of the device fields and do some
> > + * preliminary initialization. The mspeth resources are statically
> > + * allocated.
> > + */
> > +
> > +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
> > +int mspeth_probe(struct platform_device *pldev)
> > +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
> > +int __init mspeth_probe(struct net_device *dev)
> > +#endif
> > +{
> > + int unit, hwunit;
> > + int i, err;
> > + u8 macaddr[8];
> > + struct mspeth_priv *lp;
> > + char tmp_str[128];
> > +
> > +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
> > + struct net_device *dev = NULL;
> > + struct resource *res;
> > + void *mapaddr;
> > + unit = pldev->id;
> > +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
> > + sscanf(dev->name, "eth%d", &unit);
> > +#endif
> > +
> > + /* default return value -- no device here */
> > + err = -ENODEV;
> > +
> > + /*
> > + * Scan the hardware list and associate a logical unit with a
> > + * hardware unit it's important to keep these two straight.
> > + * hwunit is used for accessing the prom and all hardware.
> > + * unit is used when parsing the commandline and any other
> > + * uses that might refer to *all* eth devices (not just mspeth
> > + * devices) in the system.
> > + */
> > + for (i = 0, hwunit = 0; hwunit < MSPETH_MAX_UNITS; hwunit++) {
> > + if (identify_enet(hwunit) != FEATURE_NOEXIST)
> > + if (i++ == unit)
> > + break;
> > + }
> > +
> > + /* Sanity checks on hardware parameters */
> > + if (unit < 0 || hwunit >= MSPETH_MAX_UNITS)
> > + goto out_err;
> > +
> > + /* Retrieve the mac address from the PROM */
> > + snprintf(tmp_str, 128, "ethaddr%d", hwunit);
> > + if (get_ethernet_addr(tmp_str, macaddr)) {
> > + printk(KERN_WARNING "MSPETH(probe): "
> > + "No Mac addr specified for eth%d, hwunit %d\n",
> > + unit, hwunit);
> > + goto out_err;
> > + }
> > +
> > + if (macaddr[0] & 0x01) {
> > + printk(KERN_WARNING "MSPETH(probe): "
> > + "Bad Multicast Mac addr specified for eth%d, "
> > + "hwunit %d %02x:%02x:%02x:%02x:%02x:%02x\n",
> > + unit, hwunit,
> > + macaddr[0], macaddr[1], macaddr[2],
> > + macaddr[3], macaddr[4], macaddr[5]);
> > + goto out_err;
> > + }
> > +
> > +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
> > + dev = alloc_etherdev(sizeof(struct mspeth_priv));
> > + if (!dev) {
> > + err = -ENOMEM;
> > + goto out_err;
> > + }
> > +
> > + SET_MODULE_OWNER(dev);
> > + SET_NETDEV_DEV(dev, &pldev->dev);
> > + dev_set_drvdata(&pldev->dev, dev);
> > +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
> > + /* Create & initialize the local device structure */
> > + if (dev->priv == NULL) {
> > + dev->priv = kmalloc(sizeof(struct mspeth_priv),
> > + GFP_KERNEL);
> > + if (dev->priv == NULL)
> > + goto out_err;
> > + }
> > +#endif
> > +
> > + lp = netdev_priv(dev);
> > + memset(lp, 0, sizeof(struct mspeth_priv));
>
> redundant memset()
>
>
> > +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
> > + lp->dev = &pldev->dev;
> > +
> > + res = platform_get_resource(pldev, IORESOURCE_MEM, 0);
> > + if (!res) {
> > + printk(KERN_ERR "MSPETH(probe) %s: "
> > + "IOMEM resource not found for eth%d\n",
> > + dev->name, unit);
> > + goto out_netdev;
> > + }
> > +
> > + /* reserve the memory region */
> > + if (!request_mem_region(res->start, res->end - res->start + 1,
> > + cardname)) {
> > + printk(KERN_ERR "MSPETH(probe) %s: unable to "
> > + "get memory/io address region 0x08%lx\n",
> > + dev->name, dev->base_addr);
> > + goto out_netdev;
> > + }
> > +
> > + /* remap the memory */
> > + mapaddr = ioremap_nocache(res->start, res->end - res->start + 1);
> > + if (!mapaddr) {
> > + printk(KERN_WARNING "MSPETH(probe) %s: "
> > + "unable to ioremap address 0x%08x\n",
> > + dev->name, res->start);
> > + goto out_unreserve;
> > + }
> > +
> > + lp->mapaddr = mapaddr;
> > + dev->base_addr = res->start;
> > + dev->irq = platform_get_irq(pldev, 0);
> > +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
> > + /*
> > + * Dig out the parameters from the defines and do other
> > + * hwunit specific stuff
> > + */
> > + switch (hwunit) {
> > + case 0:
> > + dev->base_addr = MSP_MAC0_BASE;
> > + dev->irq = MSP_INT_MAC0;
> > + break;
> > + case 1:
> > + dev->base_addr = MSP_MAC1_BASE;
> > + dev->irq = MSP_INT_MAC1;
> > + break;
> > + case 2:
> > + dev->base_addr = MSP_MAC2_BASE;
> > + dev->irq = MSP_INT_MAC2;
> > + break;
> > + default:
> > + printk(KERN_WARNING "MSPETH(probe): "
> > + "Unsupported hardware unit %d\n", hwunit);
> > + goto out_unmap;
> > + }
> > +
> > + /* reserve the memory region */
> > + if (!request_mem_region(dev->base_addr, MSP_MAC_SIZE, cardname)) {
> > + printk(KERN_ERR "MSPETH(probe) %s: unable to "
> > + "get memory/io address region 0x08%lx\n",
> > + dev->name, dev->base_addr);
> > + goto out_err;
> > + }
> > +
> > + /* remap the memory */
> > + lp->mapaddr = ioremap_nocache(dev->base_addr, MSP_MAC_SIZE);
> > + if (!lp->mapaddr) {
> > + printk(KERN_ERR "MSPETH(probe) %s: unable to "
> > + "ioremap address 0x%08lx\n",
> > + dev->name, dev->base_addr);
> > + goto out_unreserve;
> > + }
> > +#endif
> > +
> > + /* remap the system reset registers */
> > + lp->rstaddr = ioremap_nocache(MSP_RST_BASE, MSP_RST_SIZE);
> > + if (!lp->rstaddr) {
> > + printk(KERN_ERR "MSPETH(probe) %s: unable to "
> > + "ioremap address 0x%08x\n",
> > + dev->name, MSP_RST_BASE);
> > + goto out_unmap;
> > + }
> > +
> > + /* set the logical and hardware units */
> > + lp->unit = unit;
> > + lp->hwunit = hwunit;
> > +
> > + /* probe for PHYS attached to this MACs MDIO interface */
> > + if (mspeth_phyprobe(dev))
> > + goto out_unmap;
> > +
> > + /* parse the environment and command line */
> > + mspeth_init_cmdline(dev);
> > + mspeth_init_phyaddr(dev);
> > +
> > + /* MAC address */
> > + dev->addr_len = ETH_ALEN;
> > + for (i = 0; i < dev->addr_len; i++)
> > + dev->dev_addr[i] = macaddr[i];
> > +
> > + /* register the /proc entry */
> > + snprintf(tmp_str, 128, "pmcmspeth%d", unit);
> > + create_proc_read_entry(tmp_str, 0644, proc_net,
> > + mspeth_proc_info, dev);
> > +
> > +#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)) && \
> > + (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0))
> > + ether_setup(dev);
> > +#endif
> > + /* set the various call back functions */
> > + dev->open = mspeth_open;
> > + dev->stop = mspeth_close;
> > + dev->tx_timeout = mspeth_tx_timeout;
> > + dev->watchdog_timeo = TX_TIMEOUT * HZ;
> > + dev->hard_start_xmit = mspeth_send_packet;
> > + dev->get_stats = mspeth_get_stats;
> > + dev->set_multicast_list = mspeth_set_multicast_list;
> > +#ifdef CONFIG_MSPETH_NAPI
> > + dev->poll = mspeth_poll;
> > + dev->weight = NAPI_WEIGHT;
> > +#endif
> > +
> > + /* debugging output */
> > + printk(KERN_INFO
> > + "eth%d: found at physical address %lx, irq %d\n",
> > + unit, dev->base_addr, dev->irq);
> > + if (mspeth_debug > 1) {
> > + printk(KERN_INFO "MSPETH(probe) eth%d: "
> > + "associated with hardware unit %d\n",
> > + unit, hwunit);
> > + printk(KERN_INFO "MSPETH(probe) eth%d: assigned "
> > + "MAC address %02x:%02x:%02x:%02x:%02x:%02x\n",
> > + unit, macaddr[0], macaddr[1], macaddr[2],
> > + macaddr[3], macaddr[4], macaddr[5]);
> > + printk(KERN_INFO "MSPETH(probe) eth%d: "
> > + "phytype %c, phyclk %c\n",
> > + unit, identify_enet(hwunit),
> > + identify_enetTxD(hwunit));
> > + }
> > +
> > +#ifdef CONFIG_MSPETH_SKB_RECYCLE
> > + /* initialize the socket buffer recycle bin */
> > + init_skbuff_bin();
> > +#endif
> > +
> > +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
> > + err = register_netdev(dev);
> > + if (err) {
> > + printk(KERN_WARNING "MSPETH(probe) eth%d: "
> > + "unable to register network device\n", unit);
> > + goto out_unmap;
> > + }
> > +#endif
> > +
> > + return 0;
> > +
> > +out_unmap:
> > + if (lp->rstaddr)
> > + iounmap(lp->rstaddr);
> > + iounmap(lp->mapaddr);
> > +
> > +out_unreserve:
> > +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
> > + release_mem_region(res->start, res->end - res->start + 1);
> > +
> > +out_netdev:
> > + free_netdev(dev);
> > +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
> > + release_mem_region(dev->base_addr, MSP_MAC_SIZE);
> > +#endif
> > +
> > +out_err:
> > + return err;
> > +}
>
> I stopped reviewing here. Will await resend with changes, particularly
> removal of all kernel back-compat code
>
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