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kernel-ark/drivers/net/gianfar_ethtool.c
Andy Fleming fef6108d45 [PATCH] Fix locking in gianfar 
This patch fixes several bugs in the gianfar driver, including a major one
where spinlocks were horribly broken:

* Split gianfar locks into two types: TX and RX
* Made it so gfar_start() now clears RHALT
* Fixed a bug where calling gfar_start_xmit() with interrupts off would
corrupt the interrupt state
* Fixed a bug where a frame could potentially arrive, and never be handled
(if no more frames arrived
* Fixed a bug where the rx_work_limit would never be observed by the rx
completion code
* Fixed a bug where the interrupt handlers were not actually protected by
their spinlocks

Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-04-20 17:55:06 -04:00

592 lines
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/*
* drivers/net/gianfar_ethtool.c
*
* Gianfar Ethernet Driver
* Ethtool support for Gianfar Enet
* Based on e1000 ethtool support
*
* Author: Andy Fleming
* Maintainer: Kumar Gala
*
* Copyright (c) 2003,2004 Freescale Semiconductor, Inc.
*
* This software may be used and distributed according to
* the terms of the GNU Public License, Version 2, incorporated herein
* by reference.
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <linux/module.h>
#include <linux/crc32.h>
#include <asm/types.h>
#include <asm/uaccess.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/phy.h>
#include "gianfar.h"
#define is_power_of_2(x) ((x) != 0 && (((x) & ((x) - 1)) == 0))
extern void gfar_start(struct net_device *dev);
extern int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit);
#define GFAR_MAX_COAL_USECS 0xffff
#define GFAR_MAX_COAL_FRAMES 0xff
static void gfar_fill_stats(struct net_device *dev, struct ethtool_stats *dummy,
u64 * buf);
static void gfar_gstrings(struct net_device *dev, u32 stringset, u8 * buf);
static int gfar_gcoalesce(struct net_device *dev, struct ethtool_coalesce *cvals);
static int gfar_scoalesce(struct net_device *dev, struct ethtool_coalesce *cvals);
static void gfar_gringparam(struct net_device *dev, struct ethtool_ringparam *rvals);
static int gfar_sringparam(struct net_device *dev, struct ethtool_ringparam *rvals);
static void gfar_gdrvinfo(struct net_device *dev, struct ethtool_drvinfo *drvinfo);
static char stat_gstrings[][ETH_GSTRING_LEN] = {
"rx-dropped-by-kernel",
"rx-large-frame-errors",
"rx-short-frame-errors",
"rx-non-octet-errors",
"rx-crc-errors",
"rx-overrun-errors",
"rx-busy-errors",
"rx-babbling-errors",
"rx-truncated-frames",
"ethernet-bus-error",
"tx-babbling-errors",
"tx-underrun-errors",
"rx-skb-missing-errors",
"tx-timeout-errors",
"tx-rx-64-frames",
"tx-rx-65-127-frames",
"tx-rx-128-255-frames",
"tx-rx-256-511-frames",
"tx-rx-512-1023-frames",
"tx-rx-1024-1518-frames",
"tx-rx-1519-1522-good-vlan",
"rx-bytes",
"rx-packets",
"rx-fcs-errors",
"receive-multicast-packet",
"receive-broadcast-packet",
"rx-control-frame-packets",
"rx-pause-frame-packets",
"rx-unknown-op-code",
"rx-alignment-error",
"rx-frame-length-error",
"rx-code-error",
"rx-carrier-sense-error",
"rx-undersize-packets",
"rx-oversize-packets",
"rx-fragmented-frames",
"rx-jabber-frames",
"rx-dropped-frames",
"tx-byte-counter",
"tx-packets",
"tx-multicast-packets",
"tx-broadcast-packets",
"tx-pause-control-frames",
"tx-deferral-packets",
"tx-excessive-deferral-packets",
"tx-single-collision-packets",
"tx-multiple-collision-packets",
"tx-late-collision-packets",
"tx-excessive-collision-packets",
"tx-total-collision",
"reserved",
"tx-dropped-frames",
"tx-jabber-frames",
"tx-fcs-errors",
"tx-control-frames",
"tx-oversize-frames",
"tx-undersize-frames",
"tx-fragmented-frames",
};
/* Fill in a buffer with the strings which correspond to the
* stats */
static void gfar_gstrings(struct net_device *dev, u32 stringset, u8 * buf)
{
struct gfar_private *priv = netdev_priv(dev);
if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_RMON)
memcpy(buf, stat_gstrings, GFAR_STATS_LEN * ETH_GSTRING_LEN);
else
memcpy(buf, stat_gstrings,
GFAR_EXTRA_STATS_LEN * ETH_GSTRING_LEN);
}
/* Fill in an array of 64-bit statistics from various sources.
* This array will be appended to the end of the ethtool_stats
* structure, and returned to user space
*/
static void gfar_fill_stats(struct net_device *dev, struct ethtool_stats *dummy, u64 * buf)
{
int i;
struct gfar_private *priv = netdev_priv(dev);
u64 *extra = (u64 *) & priv->extra_stats;
if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
u32 __iomem *rmon = (u32 __iomem *) & priv->regs->rmon;
struct gfar_stats *stats = (struct gfar_stats *) buf;
for (i = 0; i < GFAR_RMON_LEN; i++)
stats->rmon[i] = (u64) gfar_read(&rmon[i]);
for (i = 0; i < GFAR_EXTRA_STATS_LEN; i++)
stats->extra[i] = extra[i];
} else
for (i = 0; i < GFAR_EXTRA_STATS_LEN; i++)
buf[i] = extra[i];
}
/* Returns the number of stats (and their corresponding strings) */
static int gfar_stats_count(struct net_device *dev)
{
struct gfar_private *priv = netdev_priv(dev);
if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_RMON)
return GFAR_STATS_LEN;
else
return GFAR_EXTRA_STATS_LEN;
}
/* Fills in the drvinfo structure with some basic info */
static void gfar_gdrvinfo(struct net_device *dev, struct
ethtool_drvinfo *drvinfo)
{
strncpy(drvinfo->driver, DRV_NAME, GFAR_INFOSTR_LEN);
strncpy(drvinfo->version, gfar_driver_version, GFAR_INFOSTR_LEN);
strncpy(drvinfo->fw_version, "N/A", GFAR_INFOSTR_LEN);
strncpy(drvinfo->bus_info, "N/A", GFAR_INFOSTR_LEN);
drvinfo->n_stats = GFAR_STATS_LEN;
drvinfo->testinfo_len = 0;
drvinfo->regdump_len = 0;
drvinfo->eedump_len = 0;
}
static int gfar_ssettings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct gfar_private *priv = netdev_priv(dev);
struct phy_device *phydev = priv->phydev;
if (NULL == phydev)
return -ENODEV;
return phy_ethtool_sset(phydev, cmd);
}
/* Return the current settings in the ethtool_cmd structure */
static int gfar_gsettings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct gfar_private *priv = netdev_priv(dev);
struct phy_device *phydev = priv->phydev;
if (NULL == phydev)
return -ENODEV;
cmd->maxtxpkt = priv->txcount;
cmd->maxrxpkt = priv->rxcount;
return phy_ethtool_gset(phydev, cmd);
}
/* Return the length of the register structure */
static int gfar_reglen(struct net_device *dev)
{
return sizeof (struct gfar);
}
/* Return a dump of the GFAR register space */
static void gfar_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *regbuf)
{
int i;
struct gfar_private *priv = netdev_priv(dev);
u32 __iomem *theregs = (u32 __iomem *) priv->regs;
u32 *buf = (u32 *) regbuf;
for (i = 0; i < sizeof (struct gfar) / sizeof (u32); i++)
buf[i] = gfar_read(&theregs[i]);
}
/* Convert microseconds to ethernet clock ticks, which changes
* depending on what speed the controller is running at */
static unsigned int gfar_usecs2ticks(struct gfar_private *priv, unsigned int usecs)
{
unsigned int count;
/* The timer is different, depending on the interface speed */
switch (priv->phydev->speed) {
case SPEED_1000:
count = GFAR_GBIT_TIME;
break;
case SPEED_100:
count = GFAR_100_TIME;
break;
case SPEED_10:
default:
count = GFAR_10_TIME;
break;
}
/* Make sure we return a number greater than 0
* if usecs > 0 */
return ((usecs * 1000 + count - 1) / count);
}
/* Convert ethernet clock ticks to microseconds */
static unsigned int gfar_ticks2usecs(struct gfar_private *priv, unsigned int ticks)
{
unsigned int count;
/* The timer is different, depending on the interface speed */
switch (priv->phydev->speed) {
case SPEED_1000:
count = GFAR_GBIT_TIME;
break;
case SPEED_100:
count = GFAR_100_TIME;
break;
case SPEED_10:
default:
count = GFAR_10_TIME;
break;
}
/* Make sure we return a number greater than 0 */
/* if ticks is > 0 */
return ((ticks * count) / 1000);
}
/* Get the coalescing parameters, and put them in the cvals
* structure. */
static int gfar_gcoalesce(struct net_device *dev, struct ethtool_coalesce *cvals)
{
struct gfar_private *priv = netdev_priv(dev);
if (!(priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_COALESCE))
return -EOPNOTSUPP;
if (NULL == priv->phydev)
return -ENODEV;
cvals->rx_coalesce_usecs = gfar_ticks2usecs(priv, priv->rxtime);
cvals->rx_max_coalesced_frames = priv->rxcount;
cvals->tx_coalesce_usecs = gfar_ticks2usecs(priv, priv->txtime);
cvals->tx_max_coalesced_frames = priv->txcount;
cvals->use_adaptive_rx_coalesce = 0;
cvals->use_adaptive_tx_coalesce = 0;
cvals->pkt_rate_low = 0;
cvals->rx_coalesce_usecs_low = 0;
cvals->rx_max_coalesced_frames_low = 0;
cvals->tx_coalesce_usecs_low = 0;
cvals->tx_max_coalesced_frames_low = 0;
/* When the packet rate is below pkt_rate_high but above
* pkt_rate_low (both measured in packets per second) the
* normal {rx,tx}_* coalescing parameters are used.
*/
/* When the packet rate is (measured in packets per second)
* is above pkt_rate_high, the {rx,tx}_*_high parameters are
* used.
*/
cvals->pkt_rate_high = 0;
cvals->rx_coalesce_usecs_high = 0;
cvals->rx_max_coalesced_frames_high = 0;
cvals->tx_coalesce_usecs_high = 0;
cvals->tx_max_coalesced_frames_high = 0;
/* How often to do adaptive coalescing packet rate sampling,
* measured in seconds. Must not be zero.
*/
cvals->rate_sample_interval = 0;
return 0;
}
/* Change the coalescing values.
* Both cvals->*_usecs and cvals->*_frames have to be > 0
* in order for coalescing to be active
*/
static int gfar_scoalesce(struct net_device *dev, struct ethtool_coalesce *cvals)
{
struct gfar_private *priv = netdev_priv(dev);
if (!(priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_COALESCE))
return -EOPNOTSUPP;
/* Set up rx coalescing */
if ((cvals->rx_coalesce_usecs == 0) ||
(cvals->rx_max_coalesced_frames == 0))
priv->rxcoalescing = 0;
else
priv->rxcoalescing = 1;
if (NULL == priv->phydev)
return -ENODEV;
/* Check the bounds of the values */
if (cvals->rx_coalesce_usecs > GFAR_MAX_COAL_USECS) {
pr_info("Coalescing is limited to %d microseconds\n",
GFAR_MAX_COAL_USECS);
return -EINVAL;
}
if (cvals->rx_max_coalesced_frames > GFAR_MAX_COAL_FRAMES) {
pr_info("Coalescing is limited to %d frames\n",
GFAR_MAX_COAL_FRAMES);
return -EINVAL;
}
priv->rxtime = gfar_usecs2ticks(priv, cvals->rx_coalesce_usecs);
priv->rxcount = cvals->rx_max_coalesced_frames;
/* Set up tx coalescing */
if ((cvals->tx_coalesce_usecs == 0) ||
(cvals->tx_max_coalesced_frames == 0))
priv->txcoalescing = 0;
else
priv->txcoalescing = 1;
/* Check the bounds of the values */
if (cvals->tx_coalesce_usecs > GFAR_MAX_COAL_USECS) {
pr_info("Coalescing is limited to %d microseconds\n",
GFAR_MAX_COAL_USECS);
return -EINVAL;
}
if (cvals->tx_max_coalesced_frames > GFAR_MAX_COAL_FRAMES) {
pr_info("Coalescing is limited to %d frames\n",
GFAR_MAX_COAL_FRAMES);
return -EINVAL;
}
priv->txtime = gfar_usecs2ticks(priv, cvals->tx_coalesce_usecs);
priv->txcount = cvals->tx_max_coalesced_frames;
if (priv->rxcoalescing)
gfar_write(&priv->regs->rxic,
mk_ic_value(priv->rxcount, priv->rxtime));
else
gfar_write(&priv->regs->rxic, 0);
if (priv->txcoalescing)
gfar_write(&priv->regs->txic,
mk_ic_value(priv->txcount, priv->txtime));
else
gfar_write(&priv->regs->txic, 0);
return 0;
}
/* Fills in rvals with the current ring parameters. Currently,
* rx, rx_mini, and rx_jumbo rings are the same size, as mini and
* jumbo are ignored by the driver */
static void gfar_gringparam(struct net_device *dev, struct ethtool_ringparam *rvals)
{
struct gfar_private *priv = netdev_priv(dev);
rvals->rx_max_pending = GFAR_RX_MAX_RING_SIZE;
rvals->rx_mini_max_pending = GFAR_RX_MAX_RING_SIZE;
rvals->rx_jumbo_max_pending = GFAR_RX_MAX_RING_SIZE;
rvals->tx_max_pending = GFAR_TX_MAX_RING_SIZE;
/* Values changeable by the user. The valid values are
* in the range 1 to the "*_max_pending" counterpart above.
*/
rvals->rx_pending = priv->rx_ring_size;
rvals->rx_mini_pending = priv->rx_ring_size;
rvals->rx_jumbo_pending = priv->rx_ring_size;
rvals->tx_pending = priv->tx_ring_size;
}
/* Change the current ring parameters, stopping the controller if
* necessary so that we don't mess things up while we're in
* motion. We wait for the ring to be clean before reallocating
* the rings. */
static int gfar_sringparam(struct net_device *dev, struct ethtool_ringparam *rvals)
{
struct gfar_private *priv = netdev_priv(dev);
int err = 0;
if (rvals->rx_pending > GFAR_RX_MAX_RING_SIZE)
return -EINVAL;
if (!is_power_of_2(rvals->rx_pending)) {
printk("%s: Ring sizes must be a power of 2\n",
dev->name);
return -EINVAL;
}
if (rvals->tx_pending > GFAR_TX_MAX_RING_SIZE)
return -EINVAL;
if (!is_power_of_2(rvals->tx_pending)) {
printk("%s: Ring sizes must be a power of 2\n",
dev->name);
return -EINVAL;
}
if (dev->flags & IFF_UP) {
unsigned long flags;
/* Halt TX and RX, and process the frames which
* have already been received */
spin_lock_irqsave(&priv->txlock, flags);
spin_lock(&priv->rxlock);
gfar_halt(dev);
gfar_clean_rx_ring(dev, priv->rx_ring_size);
spin_unlock(&priv->rxlock);
spin_unlock_irqrestore(&priv->txlock, flags);
/* Now we take down the rings to rebuild them */
stop_gfar(dev);
}
/* Change the size */
priv->rx_ring_size = rvals->rx_pending;
priv->tx_ring_size = rvals->tx_pending;
/* Rebuild the rings with the new size */
if (dev->flags & IFF_UP)
err = startup_gfar(dev);
return err;
}
static int gfar_set_rx_csum(struct net_device *dev, uint32_t data)
{
struct gfar_private *priv = netdev_priv(dev);
int err = 0;
if (!(priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_CSUM))
return -EOPNOTSUPP;
if (dev->flags & IFF_UP) {
unsigned long flags;
/* Halt TX and RX, and process the frames which
* have already been received */
spin_lock_irqsave(&priv->txlock, flags);
spin_lock(&priv->rxlock);
gfar_halt(dev);
gfar_clean_rx_ring(dev, priv->rx_ring_size);
spin_unlock(&priv->rxlock);
spin_unlock_irqrestore(&priv->txlock, flags);
/* Now we take down the rings to rebuild them */
stop_gfar(dev);
}
priv->rx_csum_enable = data;
if (dev->flags & IFF_UP)
err = startup_gfar(dev);
return err;
}
static uint32_t gfar_get_rx_csum(struct net_device *dev)
{
struct gfar_private *priv = netdev_priv(dev);
if (!(priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_CSUM))
return 0;
return priv->rx_csum_enable;
}
static int gfar_set_tx_csum(struct net_device *dev, uint32_t data)
{
unsigned long flags;
struct gfar_private *priv = netdev_priv(dev);
if (!(priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_CSUM))
return -EOPNOTSUPP;
spin_lock_irqsave(&priv->txlock, flags);
gfar_halt(dev);
if (data)
dev->features |= NETIF_F_IP_CSUM;
else
dev->features &= ~NETIF_F_IP_CSUM;
gfar_start(dev);
spin_unlock_irqrestore(&priv->txlock, flags);
return 0;
}
static uint32_t gfar_get_tx_csum(struct net_device *dev)
{
struct gfar_private *priv = netdev_priv(dev);
if (!(priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_CSUM))
return 0;
return (dev->features & NETIF_F_IP_CSUM) != 0;
}
static uint32_t gfar_get_msglevel(struct net_device *dev)
{
struct gfar_private *priv = netdev_priv(dev);
return priv->msg_enable;
}
static void gfar_set_msglevel(struct net_device *dev, uint32_t data)
{
struct gfar_private *priv = netdev_priv(dev);
priv->msg_enable = data;
}
struct ethtool_ops gfar_ethtool_ops = {
.get_settings = gfar_gsettings,
.set_settings = gfar_ssettings,
.get_drvinfo = gfar_gdrvinfo,
.get_regs_len = gfar_reglen,
.get_regs = gfar_get_regs,
.get_link = ethtool_op_get_link,
.get_coalesce = gfar_gcoalesce,
.set_coalesce = gfar_scoalesce,
.get_ringparam = gfar_gringparam,
.set_ringparam = gfar_sringparam,
.get_strings = gfar_gstrings,
.get_stats_count = gfar_stats_count,
.get_ethtool_stats = gfar_fill_stats,
.get_rx_csum = gfar_get_rx_csum,
.get_tx_csum = gfar_get_tx_csum,
.set_rx_csum = gfar_set_rx_csum,
.set_tx_csum = gfar_set_tx_csum,
.get_msglevel = gfar_get_msglevel,
.set_msglevel = gfar_set_msglevel,
};
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