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dsa: mv88x6xxx: Refactor getting a single statistic 

Move the code to retrieve a statistics counter into a function of its
own, so it can later be reused.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2015-06-20 18:42:30 +02:00 committed by David S. Miller
parent 8a0a265d19
commit 80c4627b27
2 changed files with 40 additions and 27 deletions
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63
drivers/net/dsa/mv88e6xxx.c
View File

@ -681,6 +681,40 @@ static void _mv88e6xxx_get_strings(struct dsa_switch *ds,
}
}
static uint64_t _mv88e6xxx_get_ethtool_stat(struct dsa_switch *ds,
int stat,
struct mv88e6xxx_hw_stat *stats,
int port)
{
struct mv88e6xxx_hw_stat *s = stats + stat;
u32 low;
u32 high = 0;
int ret;
u64 value;
if (s->reg >= 0x100) {
ret = _mv88e6xxx_reg_read(ds, REG_PORT(port),
s->reg - 0x100);
if (ret < 0)
return UINT64_MAX;
low = ret;
if (s->sizeof_stat == 4) {
ret = _mv88e6xxx_reg_read(ds, REG_PORT(port),
s->reg - 0x100 + 1);
if (ret < 0)
return UINT64_MAX;
high = ret;
}
} else {
_mv88e6xxx_stats_read(ds, s->reg, &low);
if (s->sizeof_stat == 8)
_mv88e6xxx_stats_read(ds, s->reg + 1, &high);
}
value = (((u64)high) << 16) | low;
return value;
}
static void _mv88e6xxx_get_ethtool_stats(struct dsa_switch *ds,
int nr_stats,
struct mv88e6xxx_hw_stat *stats,
@ -699,34 +733,9 @@ static void _mv88e6xxx_get_ethtool_stats(struct dsa_switch *ds,
}
/* Read each of the counters. */
for (i = 0; i < nr_stats; i++) {
struct mv88e6xxx_hw_stat *s = stats + i;
u32 low;
u32 high = 0;
for (i = 0; i < nr_stats; i++)
data[i] = _mv88e6xxx_get_ethtool_stat(ds, i, stats, port);
if (s->reg >= 0x100) {
ret = _mv88e6xxx_reg_read(ds, REG_PORT(port),
s->reg - 0x100);
if (ret < 0)
goto error;
low = ret;
if (s->sizeof_stat == 4) {
ret = _mv88e6xxx_reg_read(ds, REG_PORT(port),
s->reg - 0x100 + 1);
if (ret < 0)
goto error;
high = ret;
}
data[i] = (((u64)high) << 16) | low;
continue;
}
_mv88e6xxx_stats_read(ds, s->reg, &low);
if (s->sizeof_stat == 8)
_mv88e6xxx_stats_read(ds, s->reg + 1, &high);
data[i] = (((u64)high) << 32) | low;
}
error:
mutex_unlock(&ps->smi_mutex);
}

4
drivers/net/dsa/mv88e6xxx.h
View File

@ -11,6 +11,10 @@
#ifndef __MV88E6XXX_H
#define __MV88E6XXX_H
#ifndef UINT64_MAX
#define UINT64_MAX (u64)(~((u64)0))
#endif
#define SMI_CMD 0x00
#define SMI_CMD_BUSY BIT(15)
#define SMI_CMD_CLAUSE_22 BIT(12)