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android_kernel_xiaomi_sm8350/drivers/net/ioc3-eth.c
Ralf Baechle f0ba73583a Fix link autonegotiation timer. 
Start link negotiation in the open method.  Previously it was started
on driver initialialization and shutdown on close so an ifdown would
have results in closing negotiation for good.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-02-17 15:37:14 -05:00

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43 KiB
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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Driver for SGI's IOC3 based Ethernet cards as found in the PCI card.
*
* Copyright (C) 1999, 2000, 2001, 2003 Ralf Baechle
* Copyright (C) 1995, 1999, 2000, 2001 by Silicon Graphics, Inc.
*
* References:
* o IOC3 ASIC specification 4.51, 1996-04-18
* o IEEE 802.3 specification, 2000 edition
* o DP38840A Specification, National Semiconductor, March 1997
*
* To do:
*
* o Handle allocation failures in ioc3_alloc_skb() more gracefully.
* o Handle allocation failures in ioc3_init_rings().
* o Use prefetching for large packets. What is a good lower limit for
* prefetching?
* o We're probably allocating a bit too much memory.
* o Use hardware checksums.
* o Convert to using a IOC3 meta driver.
* o Which PHYs might possibly be attached to the IOC3 in real live,
* which workarounds are required for them? Do we ever have Lucent's?
* o For the 2.5 branch kill the mii-tool ioctls.
*/
#define IOC3_NAME "ioc3-eth"
#define IOC3_VERSION "2.6.3-4"
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/crc32.h>
#include <linux/mii.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/dma-mapping.h>
#ifdef CONFIG_SERIAL_8250
#include <linux/serial_core.h>
#include <linux/serial_8250.h>
#endif
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>
#include <net/ip.h>
#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
#include <asm/sn/types.h>
#include <asm/sn/sn0/addrs.h>
#include <asm/sn/sn0/hubni.h>
#include <asm/sn/sn0/hubio.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/ioc3.h>
#include <asm/sn/sn0/ip27.h>
#include <asm/pci/bridge.h>
/*
* 64 RX buffers. This is tunable in the range of 16 <= x < 512. The
* value must be a power of two.
*/
#define RX_BUFFS 64
#define ETCSR_FD ((17<<ETCSR_IPGR2_SHIFT) | (11<<ETCSR_IPGR1_SHIFT) | 21)
#define ETCSR_HD ((21<<ETCSR_IPGR2_SHIFT) | (21<<ETCSR_IPGR1_SHIFT) | 21)
/* Private per NIC data of the driver. */
struct ioc3_private {
struct ioc3 *regs;
unsigned long *rxr; /* pointer to receiver ring */
struct ioc3_etxd *txr;
struct sk_buff *rx_skbs[512];
struct sk_buff *tx_skbs[128];
struct net_device_stats stats;
int rx_ci; /* RX consumer index */
int rx_pi; /* RX producer index */
int tx_ci; /* TX consumer index */
int tx_pi; /* TX producer index */
int txqlen;
u32 emcr, ehar_h, ehar_l;
spinlock_t ioc3_lock;
struct mii_if_info mii;
struct pci_dev *pdev;
/* Members used by autonegotiation */
struct timer_list ioc3_timer;
};
static inline struct net_device *priv_netdev(struct ioc3_private *dev)
{
return (void *)dev - ((sizeof(struct net_device) + 31) & ~31);
}
static int ioc3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static void ioc3_set_multicast_list(struct net_device *dev);
static int ioc3_start_xmit(struct sk_buff *skb, struct net_device *dev);
static void ioc3_timeout(struct net_device *dev);
static inline unsigned int ioc3_hash(const unsigned char *addr);
static inline void ioc3_stop(struct ioc3_private *ip);
static void ioc3_init(struct net_device *dev);
static const char ioc3_str[] = "IOC3 Ethernet";
static const struct ethtool_ops ioc3_ethtool_ops;
/* We use this to acquire receive skb's that we can DMA directly into. */
#define IOC3_CACHELINE 128UL
static inline unsigned long aligned_rx_skb_addr(unsigned long addr)
{
return (~addr + 1) & (IOC3_CACHELINE - 1UL);
}
static inline struct sk_buff * ioc3_alloc_skb(unsigned long length,
unsigned int gfp_mask)
{
struct sk_buff *skb;
skb = alloc_skb(length + IOC3_CACHELINE - 1, gfp_mask);
if (likely(skb)) {
int offset = aligned_rx_skb_addr((unsigned long) skb->data);
if (offset)
skb_reserve(skb, offset);
}
return skb;
}
static inline unsigned long ioc3_map(void *ptr, unsigned long vdev)
{
#ifdef CONFIG_SGI_IP27
vdev <<= 57; /* Shift to PCI64_ATTR_VIRTUAL */
return vdev | (0xaUL << PCI64_ATTR_TARG_SHFT) | PCI64_ATTR_PREF |
((unsigned long)ptr & TO_PHYS_MASK);
#else
return virt_to_bus(ptr);
#endif
}
/* BEWARE: The IOC3 documentation documents the size of rx buffers as
1644 while it's actually 1664. This one was nasty to track down ... */
#define RX_OFFSET 10
#define RX_BUF_ALLOC_SIZE (1664 + RX_OFFSET + IOC3_CACHELINE)
/* DMA barrier to separate cached and uncached accesses. */
#define BARRIER() \
__asm__("sync" ::: "memory")
#define IOC3_SIZE 0x100000
/*
* IOC3 is a big endian device
*
* Unorthodox but makes the users of these macros more readable - the pointer
* to the IOC3's memory mapped registers is expected as struct ioc3 * ioc3
* in the environment.
*/
#define ioc3_r_mcr() be32_to_cpu(ioc3->mcr)
#define ioc3_w_mcr(v) do { ioc3->mcr = cpu_to_be32(v); } while (0)
#define ioc3_w_gpcr_s(v) do { ioc3->gpcr_s = cpu_to_be32(v); } while (0)
#define ioc3_r_emcr() be32_to_cpu(ioc3->emcr)
#define ioc3_w_emcr(v) do { ioc3->emcr = cpu_to_be32(v); } while (0)
#define ioc3_r_eisr() be32_to_cpu(ioc3->eisr)
#define ioc3_w_eisr(v) do { ioc3->eisr = cpu_to_be32(v); } while (0)
#define ioc3_r_eier() be32_to_cpu(ioc3->eier)
#define ioc3_w_eier(v) do { ioc3->eier = cpu_to_be32(v); } while (0)
#define ioc3_r_ercsr() be32_to_cpu(ioc3->ercsr)
#define ioc3_w_ercsr(v) do { ioc3->ercsr = cpu_to_be32(v); } while (0)
#define ioc3_r_erbr_h() be32_to_cpu(ioc3->erbr_h)
#define ioc3_w_erbr_h(v) do { ioc3->erbr_h = cpu_to_be32(v); } while (0)
#define ioc3_r_erbr_l() be32_to_cpu(ioc3->erbr_l)
#define ioc3_w_erbr_l(v) do { ioc3->erbr_l = cpu_to_be32(v); } while (0)
#define ioc3_r_erbar() be32_to_cpu(ioc3->erbar)
#define ioc3_w_erbar(v) do { ioc3->erbar = cpu_to_be32(v); } while (0)
#define ioc3_r_ercir() be32_to_cpu(ioc3->ercir)
#define ioc3_w_ercir(v) do { ioc3->ercir = cpu_to_be32(v); } while (0)
#define ioc3_r_erpir() be32_to_cpu(ioc3->erpir)
#define ioc3_w_erpir(v) do { ioc3->erpir = cpu_to_be32(v); } while (0)
#define ioc3_r_ertr() be32_to_cpu(ioc3->ertr)
#define ioc3_w_ertr(v) do { ioc3->ertr = cpu_to_be32(v); } while (0)
#define ioc3_r_etcsr() be32_to_cpu(ioc3->etcsr)
#define ioc3_w_etcsr(v) do { ioc3->etcsr = cpu_to_be32(v); } while (0)
#define ioc3_r_ersr() be32_to_cpu(ioc3->ersr)
#define ioc3_w_ersr(v) do { ioc3->ersr = cpu_to_be32(v); } while (0)
#define ioc3_r_etcdc() be32_to_cpu(ioc3->etcdc)
#define ioc3_w_etcdc(v) do { ioc3->etcdc = cpu_to_be32(v); } while (0)
#define ioc3_r_ebir() be32_to_cpu(ioc3->ebir)
#define ioc3_w_ebir(v) do { ioc3->ebir = cpu_to_be32(v); } while (0)
#define ioc3_r_etbr_h() be32_to_cpu(ioc3->etbr_h)
#define ioc3_w_etbr_h(v) do { ioc3->etbr_h = cpu_to_be32(v); } while (0)
#define ioc3_r_etbr_l() be32_to_cpu(ioc3->etbr_l)
#define ioc3_w_etbr_l(v) do { ioc3->etbr_l = cpu_to_be32(v); } while (0)
#define ioc3_r_etcir() be32_to_cpu(ioc3->etcir)
#define ioc3_w_etcir(v) do { ioc3->etcir = cpu_to_be32(v); } while (0)
#define ioc3_r_etpir() be32_to_cpu(ioc3->etpir)
#define ioc3_w_etpir(v) do { ioc3->etpir = cpu_to_be32(v); } while (0)
#define ioc3_r_emar_h() be32_to_cpu(ioc3->emar_h)
#define ioc3_w_emar_h(v) do { ioc3->emar_h = cpu_to_be32(v); } while (0)
#define ioc3_r_emar_l() be32_to_cpu(ioc3->emar_l)
#define ioc3_w_emar_l(v) do { ioc3->emar_l = cpu_to_be32(v); } while (0)
#define ioc3_r_ehar_h() be32_to_cpu(ioc3->ehar_h)
#define ioc3_w_ehar_h(v) do { ioc3->ehar_h = cpu_to_be32(v); } while (0)
#define ioc3_r_ehar_l() be32_to_cpu(ioc3->ehar_l)
#define ioc3_w_ehar_l(v) do { ioc3->ehar_l = cpu_to_be32(v); } while (0)
#define ioc3_r_micr() be32_to_cpu(ioc3->micr)
#define ioc3_w_micr(v) do { ioc3->micr = cpu_to_be32(v); } while (0)
#define ioc3_r_midr_r() be32_to_cpu(ioc3->midr_r)
#define ioc3_w_midr_r(v) do { ioc3->midr_r = cpu_to_be32(v); } while (0)
#define ioc3_r_midr_w() be32_to_cpu(ioc3->midr_w)
#define ioc3_w_midr_w(v) do { ioc3->midr_w = cpu_to_be32(v); } while (0)
static inline u32 mcr_pack(u32 pulse, u32 sample)
{
return (pulse << 10) | (sample << 2);
}
static int nic_wait(struct ioc3 *ioc3)
{
u32 mcr;
do {
mcr = ioc3_r_mcr();
} while (!(mcr & 2));
return mcr & 1;
}
static int nic_reset(struct ioc3 *ioc3)
{
int presence;
ioc3_w_mcr(mcr_pack(500, 65));
presence = nic_wait(ioc3);
ioc3_w_mcr(mcr_pack(0, 500));
nic_wait(ioc3);
return presence;
}
static inline int nic_read_bit(struct ioc3 *ioc3)
{
int result;
ioc3_w_mcr(mcr_pack(6, 13));
result = nic_wait(ioc3);
ioc3_w_mcr(mcr_pack(0, 100));
nic_wait(ioc3);
return result;
}
static inline void nic_write_bit(struct ioc3 *ioc3, int bit)
{
if (bit)
ioc3_w_mcr(mcr_pack(6, 110));
else
ioc3_w_mcr(mcr_pack(80, 30));
nic_wait(ioc3);
}
/*
* Read a byte from an iButton device
*/
static u32 nic_read_byte(struct ioc3 *ioc3)
{
u32 result = 0;
int i;
for (i = 0; i < 8; i++)
result = (result >> 1) | (nic_read_bit(ioc3) << 7);
return result;
}
/*
* Write a byte to an iButton device
*/
static void nic_write_byte(struct ioc3 *ioc3, int byte)
{
int i, bit;
for (i = 8; i; i--) {
bit = byte & 1;
byte >>= 1;
nic_write_bit(ioc3, bit);
}
}
static u64 nic_find(struct ioc3 *ioc3, int *last)
{
int a, b, index, disc;
u64 address = 0;
nic_reset(ioc3);
/* Search ROM. */
nic_write_byte(ioc3, 0xf0);
/* Algorithm from ``Book of iButton Standards''. */
for (index = 0, disc = 0; index < 64; index++) {
a = nic_read_bit(ioc3);
b = nic_read_bit(ioc3);
if (a && b) {
printk("NIC search failed (not fatal).\n");
*last = 0;
return 0;
}
if (!a && !b) {
if (index == *last) {
address |= 1UL << index;
} else if (index > *last) {
address &= ~(1UL << index);
disc = index;
} else if ((address & (1UL << index)) == 0)
disc = index;
nic_write_bit(ioc3, address & (1UL << index));
continue;
} else {
if (a)
address |= 1UL << index;
else
address &= ~(1UL << index);
nic_write_bit(ioc3, a);
continue;
}
}
*last = disc;
return address;
}
static int nic_init(struct ioc3 *ioc3)
{
const char *type;
u8 crc;
u8 serial[6];
int save = 0, i;
type = "unknown";
while (1) {
u64 reg;
reg = nic_find(ioc3, &save);
switch (reg & 0xff) {
case 0x91:
type = "DS1981U";
break;
default:
if (save == 0) {
/* Let the caller try again. */
return -1;
}
continue;
}
nic_reset(ioc3);
/* Match ROM. */
nic_write_byte(ioc3, 0x55);
for (i = 0; i < 8; i++)
nic_write_byte(ioc3, (reg >> (i << 3)) & 0xff);
reg >>= 8; /* Shift out type. */
for (i = 0; i < 6; i++) {
serial[i] = reg & 0xff;
reg >>= 8;
}
crc = reg & 0xff;
break;
}
printk("Found %s NIC", type);
if (type != "unknown") {
printk (" registration number %02x:%02x:%02x:%02x:%02x:%02x,"
" CRC %02x", serial[0], serial[1], serial[2],
serial[3], serial[4], serial[5], crc);
}
printk(".\n");
return 0;
}
/*
* Read the NIC (Number-In-a-Can) device used to store the MAC address on
* SN0 / SN00 nodeboards and PCI cards.
*/
static void ioc3_get_eaddr_nic(struct ioc3_private *ip)
{
struct ioc3 *ioc3 = ip->regs;
u8 nic[14];
int tries = 2; /* There may be some problem with the battery? */
int i;
ioc3_w_gpcr_s(1 << 21);
while (tries--) {
if (!nic_init(ioc3))
break;
udelay(500);
}
if (tries < 0) {
printk("Failed to read MAC address\n");
return;
}
/* Read Memory. */
nic_write_byte(ioc3, 0xf0);
nic_write_byte(ioc3, 0x00);
nic_write_byte(ioc3, 0x00);
for (i = 13; i >= 0; i--)
nic[i] = nic_read_byte(ioc3);
for (i = 2; i < 8; i++)
priv_netdev(ip)->dev_addr[i - 2] = nic[i];
}
/*
* Ok, this is hosed by design. It's necessary to know what machine the
* NIC is in in order to know how to read the NIC address. We also have
* to know if it's a PCI card or a NIC in on the node board ...
*/
static void ioc3_get_eaddr(struct ioc3_private *ip)
{
int i;
ioc3_get_eaddr_nic(ip);
printk("Ethernet address is ");
for (i = 0; i < 6; i++) {
printk("%02x", priv_netdev(ip)->dev_addr[i]);
if (i < 5)
printk(":");
}
printk(".\n");
}
static void __ioc3_set_mac_address(struct net_device *dev)
{
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3 *ioc3 = ip->regs;
ioc3_w_emar_h((dev->dev_addr[5] << 8) | dev->dev_addr[4]);
ioc3_w_emar_l((dev->dev_addr[3] << 24) | (dev->dev_addr[2] << 16) |
(dev->dev_addr[1] << 8) | dev->dev_addr[0]);
}
static int ioc3_set_mac_address(struct net_device *dev, void *addr)
{
struct ioc3_private *ip = netdev_priv(dev);
struct sockaddr *sa = addr;
memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
spin_lock_irq(&ip->ioc3_lock);
__ioc3_set_mac_address(dev);
spin_unlock_irq(&ip->ioc3_lock);
return 0;
}
/*
* Caller must hold the ioc3_lock ever for MII readers. This is also
* used to protect the transmitter side but it's low contention.
*/
static int ioc3_mdio_read(struct net_device *dev, int phy, int reg)
{
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3 *ioc3 = ip->regs;
while (ioc3_r_micr() & MICR_BUSY);
ioc3_w_micr((phy << MICR_PHYADDR_SHIFT) | reg | MICR_READTRIG);
while (ioc3_r_micr() & MICR_BUSY);
return ioc3_r_midr_r() & MIDR_DATA_MASK;
}
static void ioc3_mdio_write(struct net_device *dev, int phy, int reg, int data)
{
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3 *ioc3 = ip->regs;
while (ioc3_r_micr() & MICR_BUSY);
ioc3_w_midr_w(data);
ioc3_w_micr((phy << MICR_PHYADDR_SHIFT) | reg);
while (ioc3_r_micr() & MICR_BUSY);
}
static int ioc3_mii_init(struct ioc3_private *ip);
static struct net_device_stats *ioc3_get_stats(struct net_device *dev)
{
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3 *ioc3 = ip->regs;
ip->stats.collisions += (ioc3_r_etcdc() & ETCDC_COLLCNT_MASK);
return &ip->stats;
}
#ifdef CONFIG_SGI_IOC3_ETH_HW_RX_CSUM
static void ioc3_tcpudp_checksum(struct sk_buff *skb, uint32_t hwsum, int len)
{
struct ethhdr *eh = eth_hdr(skb);
uint32_t csum, ehsum;
unsigned int proto;
struct iphdr *ih;
uint16_t *ew;
unsigned char *cp;
/*
* Did hardware handle the checksum at all? The cases we can handle
* are:
*
* - TCP and UDP checksums of IPv4 only.
* - IPv6 would be doable but we keep that for later ...
* - Only unfragmented packets. Did somebody already tell you
* fragmentation is evil?
* - don't care about packet size. Worst case when processing a
* malformed packet we'll try to access the packet at ip header +
* 64 bytes which is still inside the skb. Even in the unlikely
* case where the checksum is right the higher layers will still
* drop the packet as appropriate.
*/
if (eh->h_proto != ntohs(ETH_P_IP))
return;
ih = (struct iphdr *) ((char *)eh + ETH_HLEN);
if (ih->frag_off & htons(IP_MF | IP_OFFSET))
return;
proto = ih->protocol;
if (proto != IPPROTO_TCP && proto != IPPROTO_UDP)
return;
/* Same as tx - compute csum of pseudo header */
csum = hwsum +
(ih->tot_len - (ih->ihl << 2)) +
htons((uint16_t)ih->protocol) +
(ih->saddr >> 16) + (ih->saddr & 0xffff) +
(ih->daddr >> 16) + (ih->daddr & 0xffff);
/* Sum up ethernet dest addr, src addr and protocol */
ew = (uint16_t *) eh;
ehsum = ew[0] + ew[1] + ew[2] + ew[3] + ew[4] + ew[5] + ew[6];
ehsum = (ehsum & 0xffff) + (ehsum >> 16);
ehsum = (ehsum & 0xffff) + (ehsum >> 16);
csum += 0xffff ^ ehsum;
/* In the next step we also subtract the 1's complement
checksum of the trailing ethernet CRC. */
cp = (char *)eh + len; /* points at trailing CRC */
if (len & 1) {
csum += 0xffff ^ (uint16_t) ((cp[1] << 8) | cp[0]);
csum += 0xffff ^ (uint16_t) ((cp[3] << 8) | cp[2]);
} else {
csum += 0xffff ^ (uint16_t) ((cp[0] << 8) | cp[1]);
csum += 0xffff ^ (uint16_t) ((cp[2] << 8) | cp[3]);
}
csum = (csum & 0xffff) + (csum >> 16);
csum = (csum & 0xffff) + (csum >> 16);
if (csum == 0xffff)
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
#endif /* CONFIG_SGI_IOC3_ETH_HW_RX_CSUM */
static inline void ioc3_rx(struct ioc3_private *ip)
{
struct sk_buff *skb, *new_skb;
struct ioc3 *ioc3 = ip->regs;
int rx_entry, n_entry, len;
struct ioc3_erxbuf *rxb;
unsigned long *rxr;
u32 w0, err;
rxr = (unsigned long *) ip->rxr; /* Ring base */
rx_entry = ip->rx_ci; /* RX consume index */
n_entry = ip->rx_pi;
skb = ip->rx_skbs[rx_entry];
rxb = (struct ioc3_erxbuf *) (skb->data - RX_OFFSET);
w0 = be32_to_cpu(rxb->w0);
while (w0 & ERXBUF_V) {
err = be32_to_cpu(rxb->err); /* It's valid ... */
if (err & ERXBUF_GOODPKT) {
len = ((w0 >> ERXBUF_BYTECNT_SHIFT) & 0x7ff) - 4;
skb_trim(skb, len);
skb->protocol = eth_type_trans(skb, priv_netdev(ip));
new_skb = ioc3_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
if (!new_skb) {
/* Ouch, drop packet and just recycle packet
to keep the ring filled. */
ip->stats.rx_dropped++;
new_skb = skb;
goto next;
}
#ifdef CONFIG_SGI_IOC3_ETH_HW_RX_CSUM
ioc3_tcpudp_checksum(skb, w0 & ERXBUF_IPCKSUM_MASK,len);
#endif
netif_rx(skb);
ip->rx_skbs[rx_entry] = NULL; /* Poison */
new_skb->dev = priv_netdev(ip);
/* Because we reserve afterwards. */
skb_put(new_skb, (1664 + RX_OFFSET));
rxb = (struct ioc3_erxbuf *) new_skb->data;
skb_reserve(new_skb, RX_OFFSET);
priv_netdev(ip)->last_rx = jiffies;
ip->stats.rx_packets++; /* Statistics */
ip->stats.rx_bytes += len;
} else {
/* The frame is invalid and the skb never
reached the network layer so we can just
recycle it. */
new_skb = skb;
ip->stats.rx_errors++;
}
if (err & ERXBUF_CRCERR) /* Statistics */
ip->stats.rx_crc_errors++;
if (err & ERXBUF_FRAMERR)
ip->stats.rx_frame_errors++;
next:
ip->rx_skbs[n_entry] = new_skb;
rxr[n_entry] = cpu_to_be64(ioc3_map(rxb, 1));
rxb->w0 = 0; /* Clear valid flag */
n_entry = (n_entry + 1) & 511; /* Update erpir */
/* Now go on to the next ring entry. */
rx_entry = (rx_entry + 1) & 511;
skb = ip->rx_skbs[rx_entry];
rxb = (struct ioc3_erxbuf *) (skb->data - RX_OFFSET);
w0 = be32_to_cpu(rxb->w0);
}
ioc3_w_erpir((n_entry << 3) | ERPIR_ARM);
ip->rx_pi = n_entry;
ip->rx_ci = rx_entry;
}
static inline void ioc3_tx(struct ioc3_private *ip)
{
unsigned long packets, bytes;
struct ioc3 *ioc3 = ip->regs;
int tx_entry, o_entry;
struct sk_buff *skb;
u32 etcir;
spin_lock(&ip->ioc3_lock);
etcir = ioc3_r_etcir();
tx_entry = (etcir >> 7) & 127;
o_entry = ip->tx_ci;
packets = 0;
bytes = 0;
while (o_entry != tx_entry) {
packets++;
skb = ip->tx_skbs[o_entry];
bytes += skb->len;
dev_kfree_skb_irq(skb);
ip->tx_skbs[o_entry] = NULL;
o_entry = (o_entry + 1) & 127; /* Next */
etcir = ioc3_r_etcir(); /* More pkts sent? */
tx_entry = (etcir >> 7) & 127;
}
ip->stats.tx_packets += packets;
ip->stats.tx_bytes += bytes;
ip->txqlen -= packets;
if (ip->txqlen < 128)
netif_wake_queue(priv_netdev(ip));
ip->tx_ci = o_entry;
spin_unlock(&ip->ioc3_lock);
}
/*
* Deal with fatal IOC3 errors. This condition might be caused by a hard or
* software problems, so we should try to recover
* more gracefully if this ever happens. In theory we might be flooded
* with such error interrupts if something really goes wrong, so we might
* also consider to take the interface down.
*/
static void ioc3_error(struct ioc3_private *ip, u32 eisr)
{
struct net_device *dev = priv_netdev(ip);
unsigned char *iface = dev->name;
spin_lock(&ip->ioc3_lock);
if (eisr & EISR_RXOFLO)
printk(KERN_ERR "%s: RX overflow.\n", iface);
if (eisr & EISR_RXBUFOFLO)
printk(KERN_ERR "%s: RX buffer overflow.\n", iface);
if (eisr & EISR_RXMEMERR)
printk(KERN_ERR "%s: RX PCI error.\n", iface);
if (eisr & EISR_RXPARERR)
printk(KERN_ERR "%s: RX SSRAM parity error.\n", iface);
if (eisr & EISR_TXBUFUFLO)
printk(KERN_ERR "%s: TX buffer underflow.\n", iface);
if (eisr & EISR_TXMEMERR)
printk(KERN_ERR "%s: TX PCI error.\n", iface);
ioc3_stop(ip);
ioc3_init(dev);
ioc3_mii_init(ip);
netif_wake_queue(dev);
spin_unlock(&ip->ioc3_lock);
}
/* The interrupt handler does all of the Rx thread work and cleans up
after the Tx thread. */
static irqreturn_t ioc3_interrupt(int irq, void *_dev)
{
struct net_device *dev = (struct net_device *)_dev;
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3 *ioc3 = ip->regs;
const u32 enabled = EISR_RXTIMERINT | EISR_RXOFLO | EISR_RXBUFOFLO |
EISR_RXMEMERR | EISR_RXPARERR | EISR_TXBUFUFLO |
EISR_TXEXPLICIT | EISR_TXMEMERR;
u32 eisr;
eisr = ioc3_r_eisr() & enabled;
ioc3_w_eisr(eisr);
(void) ioc3_r_eisr(); /* Flush */
if (eisr & (EISR_RXOFLO | EISR_RXBUFOFLO | EISR_RXMEMERR |
EISR_RXPARERR | EISR_TXBUFUFLO | EISR_TXMEMERR))
ioc3_error(ip, eisr);
if (eisr & EISR_RXTIMERINT)
ioc3_rx(ip);
if (eisr & EISR_TXEXPLICIT)
ioc3_tx(ip);
return IRQ_HANDLED;
}
static inline void ioc3_setup_duplex(struct ioc3_private *ip)
{
struct ioc3 *ioc3 = ip->regs;
if (ip->mii.full_duplex) {
ioc3_w_etcsr(ETCSR_FD);
ip->emcr |= EMCR_DUPLEX;
} else {
ioc3_w_etcsr(ETCSR_HD);
ip->emcr &= ~EMCR_DUPLEX;
}
ioc3_w_emcr(ip->emcr);
}
static void ioc3_timer(unsigned long data)
{
struct ioc3_private *ip = (struct ioc3_private *) data;
/* Print the link status if it has changed */
mii_check_media(&ip->mii, 1, 0);
ioc3_setup_duplex(ip);
ip->ioc3_timer.expires = jiffies + ((12 * HZ)/10); /* 1.2s */
add_timer(&ip->ioc3_timer);
}
/*
* Try to find a PHY. There is no apparent relation between the MII addresses
* in the SGI documentation and what we find in reality, so we simply probe
* for the PHY. It seems IOC3 PHYs usually live on address 31. One of my
* onboard IOC3s has the special oddity that probing doesn't seem to find it
* yet the interface seems to work fine, so if probing fails we for now will
* simply default to PHY 31 instead of bailing out.
*/
static int ioc3_mii_init(struct ioc3_private *ip)
{
struct net_device *dev = priv_netdev(ip);
int i, found = 0, res = 0;
int ioc3_phy_workaround = 1;
u16 word;
for (i = 0; i < 32; i++) {
word = ioc3_mdio_read(dev, i, MII_PHYSID1);
if (word != 0xffff && word != 0x0000) {
found = 1;
break; /* Found a PHY */
}
}
if (!found) {
if (ioc3_phy_workaround)
i = 31;
else {
ip->mii.phy_id = -1;
res = -ENODEV;
goto out;
}
}
ip->mii.phy_id = i;
out:
return res;
}
static void ioc3_mii_start(struct ioc3_private *ip)
{
ip->ioc3_timer.expires = jiffies + (12 * HZ)/10; /* 1.2 sec. */
ip->ioc3_timer.data = (unsigned long) ip;
ip->ioc3_timer.function = &ioc3_timer;
add_timer(&ip->ioc3_timer);
}
static inline void ioc3_clean_rx_ring(struct ioc3_private *ip)
{
struct sk_buff *skb;
int i;
for (i = ip->rx_ci; i & 15; i++) {
ip->rx_skbs[ip->rx_pi] = ip->rx_skbs[ip->rx_ci];
ip->rxr[ip->rx_pi++] = ip->rxr[ip->rx_ci++];
}
ip->rx_pi &= 511;
ip->rx_ci &= 511;
for (i = ip->rx_ci; i != ip->rx_pi; i = (i+1) & 511) {
struct ioc3_erxbuf *rxb;
skb = ip->rx_skbs[i];
rxb = (struct ioc3_erxbuf *) (skb->data - RX_OFFSET);
rxb->w0 = 0;
}
}
static inline void ioc3_clean_tx_ring(struct ioc3_private *ip)
{
struct sk_buff *skb;
int i;
for (i=0; i < 128; i++) {
skb = ip->tx_skbs[i];
if (skb) {
ip->tx_skbs[i] = NULL;
dev_kfree_skb_any(skb);
}
ip->txr[i].cmd = 0;
}
ip->tx_pi = 0;
ip->tx_ci = 0;
}
static void ioc3_free_rings(struct ioc3_private *ip)
{
struct sk_buff *skb;
int rx_entry, n_entry;
if (ip->txr) {
ioc3_clean_tx_ring(ip);
free_pages((unsigned long)ip->txr, 2);
ip->txr = NULL;
}
if (ip->rxr) {
n_entry = ip->rx_ci;
rx_entry = ip->rx_pi;
while (n_entry != rx_entry) {
skb = ip->rx_skbs[n_entry];
if (skb)
dev_kfree_skb_any(skb);
n_entry = (n_entry + 1) & 511;
}
free_page((unsigned long)ip->rxr);
ip->rxr = NULL;
}
}
static void ioc3_alloc_rings(struct net_device *dev)
{
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3_erxbuf *rxb;
unsigned long *rxr;
int i;
if (ip->rxr == NULL) {
/* Allocate and initialize rx ring. 4kb = 512 entries */
ip->rxr = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
rxr = (unsigned long *) ip->rxr;
if (!rxr)
printk("ioc3_alloc_rings(): get_zeroed_page() failed!\n");
/* Now the rx buffers. The RX ring may be larger but
we only allocate 16 buffers for now. Need to tune
this for performance and memory later. */
for (i = 0; i < RX_BUFFS; i++) {
struct sk_buff *skb;
skb = ioc3_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
if (!skb) {
show_free_areas();
continue;
}
ip->rx_skbs[i] = skb;
skb->dev = dev;
/* Because we reserve afterwards. */
skb_put(skb, (1664 + RX_OFFSET));
rxb = (struct ioc3_erxbuf *) skb->data;
rxr[i] = cpu_to_be64(ioc3_map(rxb, 1));
skb_reserve(skb, RX_OFFSET);
}
ip->rx_ci = 0;
ip->rx_pi = RX_BUFFS;
}
if (ip->txr == NULL) {
/* Allocate and initialize tx rings. 16kb = 128 bufs. */
ip->txr = (struct ioc3_etxd *)__get_free_pages(GFP_KERNEL, 2);
if (!ip->txr)
printk("ioc3_alloc_rings(): __get_free_pages() failed!\n");
ip->tx_pi = 0;
ip->tx_ci = 0;
}
}
static void ioc3_init_rings(struct net_device *dev)
{
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3 *ioc3 = ip->regs;
unsigned long ring;
ioc3_free_rings(ip);
ioc3_alloc_rings(dev);
ioc3_clean_rx_ring(ip);
ioc3_clean_tx_ring(ip);
/* Now the rx ring base, consume & produce registers. */
ring = ioc3_map(ip->rxr, 0);
ioc3_w_erbr_h(ring >> 32);
ioc3_w_erbr_l(ring & 0xffffffff);
ioc3_w_ercir(ip->rx_ci << 3);
ioc3_w_erpir((ip->rx_pi << 3) | ERPIR_ARM);
ring = ioc3_map(ip->txr, 0);
ip->txqlen = 0; /* nothing queued */
/* Now the tx ring base, consume & produce registers. */
ioc3_w_etbr_h(ring >> 32);
ioc3_w_etbr_l(ring & 0xffffffff);
ioc3_w_etpir(ip->tx_pi << 7);
ioc3_w_etcir(ip->tx_ci << 7);
(void) ioc3_r_etcir(); /* Flush */
}
static inline void ioc3_ssram_disc(struct ioc3_private *ip)
{
struct ioc3 *ioc3 = ip->regs;
volatile u32 *ssram0 = &ioc3->ssram[0x0000];
volatile u32 *ssram1 = &ioc3->ssram[0x4000];
unsigned int pattern = 0x5555;
/* Assume the larger size SSRAM and enable parity checking */
ioc3_w_emcr(ioc3_r_emcr() | (EMCR_BUFSIZ | EMCR_RAMPAR));
*ssram0 = pattern;
*ssram1 = ~pattern & IOC3_SSRAM_DM;
if ((*ssram0 & IOC3_SSRAM_DM) != pattern ||
(*ssram1 & IOC3_SSRAM_DM) != (~pattern & IOC3_SSRAM_DM)) {
/* set ssram size to 64 KB */
ip->emcr = EMCR_RAMPAR;
ioc3_w_emcr(ioc3_r_emcr() & ~EMCR_BUFSIZ);
} else
ip->emcr = EMCR_BUFSIZ | EMCR_RAMPAR;
}
static void ioc3_init(struct net_device *dev)
{
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3 *ioc3 = ip->regs;
del_timer_sync(&ip->ioc3_timer); /* Kill if running */
ioc3_w_emcr(EMCR_RST); /* Reset */
(void) ioc3_r_emcr(); /* Flush WB */
udelay(4); /* Give it time ... */
ioc3_w_emcr(0);
(void) ioc3_r_emcr();
/* Misc registers */
#ifdef CONFIG_SGI_IP27
ioc3_w_erbar(PCI64_ATTR_BAR >> 32); /* Barrier on last store */
#else
ioc3_w_erbar(0); /* Let PCI API get it right */
#endif
(void) ioc3_r_etcdc(); /* Clear on read */
ioc3_w_ercsr(15); /* RX low watermark */
ioc3_w_ertr(0); /* Interrupt immediately */
__ioc3_set_mac_address(dev);
ioc3_w_ehar_h(ip->ehar_h);
ioc3_w_ehar_l(ip->ehar_l);
ioc3_w_ersr(42); /* XXX should be random */
ioc3_init_rings(dev);
ip->emcr |= ((RX_OFFSET / 2) << EMCR_RXOFF_SHIFT) | EMCR_TXDMAEN |
EMCR_TXEN | EMCR_RXDMAEN | EMCR_RXEN | EMCR_PADEN;
ioc3_w_emcr(ip->emcr);
ioc3_w_eier(EISR_RXTIMERINT | EISR_RXOFLO | EISR_RXBUFOFLO |
EISR_RXMEMERR | EISR_RXPARERR | EISR_TXBUFUFLO |
EISR_TXEXPLICIT | EISR_TXMEMERR);
(void) ioc3_r_eier();
}
static inline void ioc3_stop(struct ioc3_private *ip)
{
struct ioc3 *ioc3 = ip->regs;
ioc3_w_emcr(0); /* Shutup */
ioc3_w_eier(0); /* Disable interrupts */
(void) ioc3_r_eier(); /* Flush */
}
static int ioc3_open(struct net_device *dev)
{
struct ioc3_private *ip = netdev_priv(dev);
if (request_irq(dev->irq, ioc3_interrupt, IRQF_SHARED, ioc3_str, dev)) {
printk(KERN_ERR "%s: Can't get irq %d\n", dev->name, dev->irq);
return -EAGAIN;
}
ip->ehar_h = 0;
ip->ehar_l = 0;
ioc3_init(dev);
ioc3_mii_start(ip);
netif_start_queue(dev);
return 0;
}
static int ioc3_close(struct net_device *dev)
{
struct ioc3_private *ip = netdev_priv(dev);
del_timer_sync(&ip->ioc3_timer);
netif_stop_queue(dev);
ioc3_stop(ip);
free_irq(dev->irq, dev);
ioc3_free_rings(ip);
return 0;
}
/*
* MENET cards have four IOC3 chips, which are attached to two sets of
* PCI slot resources each: the primary connections are on slots
* 0..3 and the secondaries are on 4..7
*
* All four ethernets are brought out to connectors; six serial ports
* (a pair from each of the first three IOC3s) are brought out to
* MiniDINs; all other subdevices are left swinging in the wind, leave
* them disabled.
*/
static inline int ioc3_is_menet(struct pci_dev *pdev)
{
struct pci_dev *dev;
return pdev->bus->parent == NULL
&& (dev = pci_find_slot(pdev->bus->number, PCI_DEVFN(0, 0)))
&& dev->vendor == PCI_VENDOR_ID_SGI
&& dev->device == PCI_DEVICE_ID_SGI_IOC3
&& (dev = pci_find_slot(pdev->bus->number, PCI_DEVFN(1, 0)))
&& dev->vendor == PCI_VENDOR_ID_SGI
&& dev->device == PCI_DEVICE_ID_SGI_IOC3
&& (dev = pci_find_slot(pdev->bus->number, PCI_DEVFN(2, 0)))
&& dev->vendor == PCI_VENDOR_ID_SGI
&& dev->device == PCI_DEVICE_ID_SGI_IOC3;
}
#ifdef CONFIG_SERIAL_8250
/*
* Note about serial ports and consoles:
* For console output, everyone uses the IOC3 UARTA (offset 0x178)
* connected to the master node (look in ip27_setup_console() and
* ip27prom_console_write()).
*
* For serial (/dev/ttyS0 etc), we can not have hardcoded serial port
* addresses on a partitioned machine. Since we currently use the ioc3
* serial ports, we use dynamic serial port discovery that the serial.c
* driver uses for pci/pnp ports (there is an entry for the SGI ioc3
* boards in pci_boards[]). Unfortunately, UARTA's pio address is greater
* than UARTB's, although UARTA on o200s has traditionally been known as
* port 0. So, we just use one serial port from each ioc3 (since the
* serial driver adds addresses to get to higher ports).
*
* The first one to do a register_console becomes the preferred console
* (if there is no kernel command line console= directive). /dev/console
* (ie 5, 1) is then "aliased" into the device number returned by the
* "device" routine referred to in this console structure
* (ip27prom_console_dev).
*
* Also look in ip27-pci.c:pci_fixup_ioc3() for some comments on working
* around ioc3 oddities in this respect.
*
* The IOC3 serials use a 22MHz clock rate with an additional divider by 3.
*/
static void __devinit ioc3_serial_probe(struct pci_dev *pdev, struct ioc3 *ioc3)
{
struct uart_port port;
/*
* We need to recognice and treat the fourth MENET serial as it
* does not have an SuperIO chip attached to it, therefore attempting
* to access it will result in bus errors. We call something an
* MENET if PCI slot 0, 1, 2 and 3 of a master PCI bus all have an IOC3
* in it. This is paranoid but we want to avoid blowing up on a
* showhorn PCI box that happens to have 4 IOC3 cards in it so it's
* not paranoid enough ...
*/
if (ioc3_is_menet(pdev) && PCI_SLOT(pdev->devfn) == 3)
return;
/*
* Register to interrupt zero because we share the interrupt with
* the serial driver which we don't properly support yet.
*
* Can't use UPF_IOREMAP as the whole of IOC3 resources have already
* been registered.
*/
memset(&port, 0, sizeof(port));
port.irq = 0;
port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
port.iotype = UPIO_MEM;
port.regshift = 0;
port.uartclk = 22000000 / 3;
port.membase = (unsigned char *) &ioc3->sregs.uarta;
serial8250_register_port(&port);
port.membase = (unsigned char *) &ioc3->sregs.uartb;
serial8250_register_port(&port);
}
#endif
static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
unsigned int sw_physid1, sw_physid2;
struct net_device *dev = NULL;
struct ioc3_private *ip;
struct ioc3 *ioc3;
unsigned long ioc3_base, ioc3_size;
u32 vendor, model, rev;
int err, pci_using_dac;
/* Configure DMA attributes. */
err = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
if (!err) {
pci_using_dac = 1;
err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
if (err < 0) {
printk(KERN_ERR "%s: Unable to obtain 64 bit DMA "
"for consistent allocations\n", pci_name(pdev));
goto out;
}
} else {
err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
if (err) {
printk(KERN_ERR "%s: No usable DMA configuration, "
"aborting.\n", pci_name(pdev));
goto out;
}
pci_using_dac = 0;
}
if (pci_enable_device(pdev))
return -ENODEV;
dev = alloc_etherdev(sizeof(struct ioc3_private));
if (!dev) {
err = -ENOMEM;
goto out_disable;
}
if (pci_using_dac)
dev->features |= NETIF_F_HIGHDMA;
err = pci_request_regions(pdev, "ioc3");
if (err)
goto out_free;
SET_MODULE_OWNER(dev);
SET_NETDEV_DEV(dev, &pdev->dev);
ip = netdev_priv(dev);
dev->irq = pdev->irq;
ioc3_base = pci_resource_start(pdev, 0);
ioc3_size = pci_resource_len(pdev, 0);
ioc3 = (struct ioc3 *) ioremap(ioc3_base, ioc3_size);
if (!ioc3) {
printk(KERN_CRIT "ioc3eth(%s): ioremap failed, goodbye.\n",
pci_name(pdev));
err = -ENOMEM;
goto out_res;
}
ip->regs = ioc3;
#ifdef CONFIG_SERIAL_8250
ioc3_serial_probe(pdev, ioc3);
#endif
spin_lock_init(&ip->ioc3_lock);
init_timer(&ip->ioc3_timer);
ioc3_stop(ip);
ioc3_init(dev);
ip->pdev = pdev;
ip->mii.phy_id_mask = 0x1f;
ip->mii.reg_num_mask = 0x1f;
ip->mii.dev = dev;
ip->mii.mdio_read = ioc3_mdio_read;
ip->mii.mdio_write = ioc3_mdio_write;
ioc3_mii_init(ip);
if (ip->mii.phy_id == -1) {
printk(KERN_CRIT "ioc3-eth(%s): Didn't find a PHY, goodbye.\n",
pci_name(pdev));
err = -ENODEV;
goto out_stop;
}
ioc3_mii_start(ip);
ioc3_ssram_disc(ip);
ioc3_get_eaddr(ip);
/* The IOC3-specific entries in the device structure. */
dev->open = ioc3_open;
dev->hard_start_xmit = ioc3_start_xmit;
dev->tx_timeout = ioc3_timeout;
dev->watchdog_timeo = 5 * HZ;
dev->stop = ioc3_close;
dev->get_stats = ioc3_get_stats;
dev->do_ioctl = ioc3_ioctl;
dev->set_multicast_list = ioc3_set_multicast_list;
dev->set_mac_address = ioc3_set_mac_address;
dev->ethtool_ops = &ioc3_ethtool_ops;
#ifdef CONFIG_SGI_IOC3_ETH_HW_TX_CSUM
dev->features = NETIF_F_IP_CSUM;
#endif
sw_physid1 = ioc3_mdio_read(dev, ip->mii.phy_id, MII_PHYSID1);
sw_physid2 = ioc3_mdio_read(dev, ip->mii.phy_id, MII_PHYSID2);
err = register_netdev(dev);
if (err)
goto out_stop;
mii_check_media(&ip->mii, 1, 1);
ioc3_setup_duplex(ip);
vendor = (sw_physid1 << 12) | (sw_physid2 >> 4);
model = (sw_physid2 >> 4) & 0x3f;
rev = sw_physid2 & 0xf;
printk(KERN_INFO "%s: Using PHY %d, vendor 0x%x, model %d, "
"rev %d.\n", dev->name, ip->mii.phy_id, vendor, model, rev);
printk(KERN_INFO "%s: IOC3 SSRAM has %d kbyte.\n", dev->name,
ip->emcr & EMCR_BUFSIZ ? 128 : 64);
return 0;
out_stop:
ioc3_stop(ip);
del_timer_sync(&ip->ioc3_timer);
ioc3_free_rings(ip);
out_res:
pci_release_regions(pdev);
out_free:
free_netdev(dev);
out_disable:
/*
* We should call pci_disable_device(pdev); here if the IOC3 wasn't
* such a weird device ...
*/
out:
return err;
}
static void __devexit ioc3_remove_one (struct pci_dev *pdev)
{
struct net_device *dev = pci_get_drvdata(pdev);
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3 *ioc3 = ip->regs;
unregister_netdev(dev);
del_timer_sync(&ip->ioc3_timer);
iounmap(ioc3);
pci_release_regions(pdev);
free_netdev(dev);
/*
* We should call pci_disable_device(pdev); here if the IOC3 wasn't
* such a weird device ...
*/
}
static struct pci_device_id ioc3_pci_tbl[] = {
{ PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3, PCI_ANY_ID, PCI_ANY_ID },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, ioc3_pci_tbl);
static struct pci_driver ioc3_driver = {
.name = "ioc3-eth",
.id_table = ioc3_pci_tbl,
.probe = ioc3_probe,
.remove = __devexit_p(ioc3_remove_one),
};
static int __init ioc3_init_module(void)
{
return pci_register_driver(&ioc3_driver);
}
static void __exit ioc3_cleanup_module(void)
{
pci_unregister_driver(&ioc3_driver);
}
static int ioc3_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
unsigned long data;
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3 *ioc3 = ip->regs;
unsigned int len;
struct ioc3_etxd *desc;
uint32_t w0 = 0;
int produce;
#ifdef CONFIG_SGI_IOC3_ETH_HW_TX_CSUM
/*
* IOC3 has a fairly simple minded checksumming hardware which simply
* adds up the 1's complement checksum for the entire packet and
* inserts it at an offset which can be specified in the descriptor
* into the transmit packet. This means we have to compensate for the
* MAC header which should not be summed and the TCP/UDP pseudo headers
* manually.
*/
if (skb->ip_summed == CHECKSUM_PARTIAL) {
int proto = ntohs(skb->nh.iph->protocol);
unsigned int csoff;
struct iphdr *ih = skb->nh.iph;
uint32_t csum, ehsum;
uint16_t *eh;
/* The MAC header. skb->mac seem the logic approach
to find the MAC header - except it's a NULL pointer ... */
eh = (uint16_t *) skb->data;
/* Sum up dest addr, src addr and protocol */
ehsum = eh[0] + eh[1] + eh[2] + eh[3] + eh[4] + eh[5] + eh[6];
/* Fold ehsum. can't use csum_fold which negates also ... */
ehsum = (ehsum & 0xffff) + (ehsum >> 16);
ehsum = (ehsum & 0xffff) + (ehsum >> 16);
/* Skip IP header; it's sum is always zero and was
already filled in by ip_output.c */
csum = csum_tcpudp_nofold(ih->saddr, ih->daddr,
ih->tot_len - (ih->ihl << 2),
proto, 0xffff ^ ehsum);
csum = (csum & 0xffff) + (csum >> 16); /* Fold again */
csum = (csum & 0xffff) + (csum >> 16);
csoff = ETH_HLEN + (ih->ihl << 2);
if (proto == IPPROTO_UDP) {
csoff += offsetof(struct udphdr, check);
skb->h.uh->check = csum;
}
if (proto == IPPROTO_TCP) {
csoff += offsetof(struct tcphdr, check);
skb->h.th->check = csum;
}
w0 = ETXD_DOCHECKSUM | (csoff << ETXD_CHKOFF_SHIFT);
}
#endif /* CONFIG_SGI_IOC3_ETH_HW_TX_CSUM */
spin_lock_irq(&ip->ioc3_lock);
data = (unsigned long) skb->data;
len = skb->len;
produce = ip->tx_pi;
desc = &ip->txr[produce];
if (len <= 104) {
/* Short packet, let's copy it directly into the ring. */
memcpy(desc->data, skb->data, skb->len);
if (len < ETH_ZLEN) {
/* Very short packet, pad with zeros at the end. */
memset(desc->data + len, 0, ETH_ZLEN - len);
len = ETH_ZLEN;
}
desc->cmd = cpu_to_be32(len | ETXD_INTWHENDONE | ETXD_D0V | w0);
desc->bufcnt = cpu_to_be32(len);
} else if ((data ^ (data + len - 1)) & 0x4000) {
unsigned long b2 = (data | 0x3fffUL) + 1UL;
unsigned long s1 = b2 - data;
unsigned long s2 = data + len - b2;
desc->cmd = cpu_to_be32(len | ETXD_INTWHENDONE |
ETXD_B1V | ETXD_B2V | w0);
desc->bufcnt = cpu_to_be32((s1 << ETXD_B1CNT_SHIFT) |
(s2 << ETXD_B2CNT_SHIFT));
desc->p1 = cpu_to_be64(ioc3_map(skb->data, 1));
desc->p2 = cpu_to_be64(ioc3_map((void *) b2, 1));
} else {
/* Normal sized packet that doesn't cross a page boundary. */
desc->cmd = cpu_to_be32(len | ETXD_INTWHENDONE | ETXD_B1V | w0);
desc->bufcnt = cpu_to_be32(len << ETXD_B1CNT_SHIFT);
desc->p1 = cpu_to_be64(ioc3_map(skb->data, 1));
}
BARRIER();
dev->trans_start = jiffies;
ip->tx_skbs[produce] = skb; /* Remember skb */
produce = (produce + 1) & 127;
ip->tx_pi = produce;
ioc3_w_etpir(produce << 7); /* Fire ... */
ip->txqlen++;
if (ip->txqlen >= 127)
netif_stop_queue(dev);
spin_unlock_irq(&ip->ioc3_lock);
return 0;
}
static void ioc3_timeout(struct net_device *dev)
{
struct ioc3_private *ip = netdev_priv(dev);
printk(KERN_ERR "%s: transmit timed out, resetting\n", dev->name);
spin_lock_irq(&ip->ioc3_lock);
ioc3_stop(ip);
ioc3_init(dev);
ioc3_mii_init(ip);
ioc3_mii_start(ip);
spin_unlock_irq(&ip->ioc3_lock);
netif_wake_queue(dev);
}
/*
* Given a multicast ethernet address, this routine calculates the
* address's bit index in the logical address filter mask
*/
static inline unsigned int ioc3_hash(const unsigned char *addr)
{
unsigned int temp = 0;
u32 crc;
int bits;
crc = ether_crc_le(ETH_ALEN, addr);
crc &= 0x3f; /* bit reverse lowest 6 bits for hash index */
for (bits = 6; --bits >= 0; ) {
temp <<= 1;
temp |= (crc & 0x1);
crc >>= 1;
}
return temp;
}
static void ioc3_get_drvinfo (struct net_device *dev,
struct ethtool_drvinfo *info)
{
struct ioc3_private *ip = netdev_priv(dev);
strcpy (info->driver, IOC3_NAME);
strcpy (info->version, IOC3_VERSION);
strcpy (info->bus_info, pci_name(ip->pdev));
}
static int ioc3_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct ioc3_private *ip = netdev_priv(dev);
int rc;
spin_lock_irq(&ip->ioc3_lock);
rc = mii_ethtool_gset(&ip->mii, cmd);
spin_unlock_irq(&ip->ioc3_lock);
return rc;
}
static int ioc3_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct ioc3_private *ip = netdev_priv(dev);
int rc;
spin_lock_irq(&ip->ioc3_lock);
rc = mii_ethtool_sset(&ip->mii, cmd);
spin_unlock_irq(&ip->ioc3_lock);
return rc;
}
static int ioc3_nway_reset(struct net_device *dev)
{
struct ioc3_private *ip = netdev_priv(dev);
int rc;
spin_lock_irq(&ip->ioc3_lock);
rc = mii_nway_restart(&ip->mii);
spin_unlock_irq(&ip->ioc3_lock);
return rc;
}
static u32 ioc3_get_link(struct net_device *dev)
{
struct ioc3_private *ip = netdev_priv(dev);
int rc;
spin_lock_irq(&ip->ioc3_lock);
rc = mii_link_ok(&ip->mii);
spin_unlock_irq(&ip->ioc3_lock);
return rc;
}
static const struct ethtool_ops ioc3_ethtool_ops = {
.get_drvinfo = ioc3_get_drvinfo,
.get_settings = ioc3_get_settings,
.set_settings = ioc3_set_settings,
.nway_reset = ioc3_nway_reset,
.get_link = ioc3_get_link,
};
static int ioc3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct ioc3_private *ip = netdev_priv(dev);
int rc;
spin_lock_irq(&ip->ioc3_lock);
rc = generic_mii_ioctl(&ip->mii, if_mii(rq), cmd, NULL);
spin_unlock_irq(&ip->ioc3_lock);
return rc;
}
static void ioc3_set_multicast_list(struct net_device *dev)
{
struct dev_mc_list *dmi = dev->mc_list;
struct ioc3_private *ip = netdev_priv(dev);
struct ioc3 *ioc3 = ip->regs;
u64 ehar = 0;
int i;
netif_stop_queue(dev); /* Lock out others. */
if (dev->flags & IFF_PROMISC) { /* Set promiscuous. */
ip->emcr |= EMCR_PROMISC;
ioc3_w_emcr(ip->emcr);
(void) ioc3_r_emcr();
} else {
ip->emcr &= ~EMCR_PROMISC;
ioc3_w_emcr(ip->emcr); /* Clear promiscuous. */
(void) ioc3_r_emcr();
if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 64)) {
/* Too many for hashing to make sense or we want all
multicast packets anyway, so skip computing all the
hashes and just accept all packets. */
ip->ehar_h = 0xffffffff;
ip->ehar_l = 0xffffffff;
} else {
for (i = 0; i < dev->mc_count; i++) {
char *addr = dmi->dmi_addr;
dmi = dmi->next;
if (!(*addr & 1))
continue;
ehar |= (1UL << ioc3_hash(addr));
}
ip->ehar_h = ehar >> 32;
ip->ehar_l = ehar & 0xffffffff;
}
ioc3_w_ehar_h(ip->ehar_h);
ioc3_w_ehar_l(ip->ehar_l);
}
netif_wake_queue(dev); /* Let us get going again. */
}
MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
MODULE_DESCRIPTION("SGI IOC3 Ethernet driver");
MODULE_LICENSE("GPL");
module_init(ioc3_init_module);
module_exit(ioc3_cleanup_module);
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