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net: netcp: Fixes to CPSW statistics collection 

In certain applications it's beneficial to allow the CPSW h/w
stats counters to continue to increment even while the kernel
polls them. This patch implements this behavior for both 1G
and 10G ethernet subsystem modules.

Signed-off-by: WingMan Kwok <w-kwok2@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WingMan Kwok 2015-07-23 15:57:23 -04:00 committed by David S. Miller
parent fbf64c1915
commit 489e8a2f09
1 changed files with 75 additions and 11 deletions
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86
drivers/net/ethernet/ti/netcp_ethss.c
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@ -642,6 +642,7 @@ struct gbe_priv {
bool enable_ale;
u8 max_num_slaves;
u8 max_num_ports; /* max_num_slaves + 1 */
u8 num_stats_mods;
struct netcp_tx_pipe tx_pipe;
int host_port;
@ -671,6 +672,7 @@ struct gbe_priv {
struct net_device *dummy_ndev;
u64 *hw_stats;
u32 *hw_stats_prev;
const struct netcp_ethtool_stat *et_stats;
int num_et_stats;
/* Lock for updating the hwstats */
@ -1550,25 +1552,37 @@ static int keystone_get_sset_count(struct net_device *ndev, int stringset)
}
}
static void gbe_reset_mod_stats(struct gbe_priv *gbe_dev, int stats_mod)
{
void __iomem *base = gbe_dev->hw_stats_regs[stats_mod];
u32 __iomem *p_stats_entry;
int i;
for (i = 0; i < gbe_dev->num_et_stats; i++) {
if (gbe_dev->et_stats[i].type == stats_mod) {
p_stats_entry = base + gbe_dev->et_stats[i].offset;
gbe_dev->hw_stats[i] = 0;
gbe_dev->hw_stats_prev[i] = readl(p_stats_entry);
}
}
}
static inline void gbe_update_hw_stats_entry(struct gbe_priv *gbe_dev,
int et_stats_entry)
{
void __iomem *base = NULL;
u32 __iomem *p;
u32 tmp = 0;
u32 __iomem *p_stats_entry;
u32 curr, delta;
/* The hw_stats_regs pointers are already
* properly set to point to the right base:
*/
base = gbe_dev->hw_stats_regs[gbe_dev->et_stats[et_stats_entry].type];
p = base + gbe_dev->et_stats[et_stats_entry].offset;
tmp = readl(p);
gbe_dev->hw_stats[et_stats_entry] += tmp;
/* write-to-decrement:
* new register value = old register value - write value
*/
writel(tmp, p);
p_stats_entry = base + gbe_dev->et_stats[et_stats_entry].offset;
curr = readl(p_stats_entry);
delta = curr - gbe_dev->hw_stats_prev[et_stats_entry];
gbe_dev->hw_stats_prev[et_stats_entry] = curr;
gbe_dev->hw_stats[et_stats_entry] += delta;
}
static void gbe_update_stats(struct gbe_priv *gbe_dev, uint64_t *data)
@ -1607,6 +1621,12 @@ static inline void gbe_stats_mod_visible_ver14(struct gbe_priv *gbe_dev,
writel(val, GBE_REG_ADDR(gbe_dev, switch_regs, stat_port_en));
}
static void gbe_reset_mod_stats_ver14(struct gbe_priv *gbe_dev, int stats_mod)
{
gbe_stats_mod_visible_ver14(gbe_dev, stats_mod);
gbe_reset_mod_stats(gbe_dev, stats_mod);
}
static void gbe_update_stats_ver14(struct gbe_priv *gbe_dev, uint64_t *data)
{
u32 half_num_et_stats = (gbe_dev->num_et_stats / 2);
@ -2560,6 +2580,7 @@ static int set_xgbe_ethss10_priv(struct gbe_priv *gbe_dev,
}
gbe_dev->xgbe_serdes_regs = regs;
gbe_dev->num_stats_mods = gbe_dev->max_num_ports;
gbe_dev->et_stats = xgbe10_et_stats;
gbe_dev->num_et_stats = ARRAY_SIZE(xgbe10_et_stats);
@ -2571,6 +2592,16 @@ static int set_xgbe_ethss10_priv(struct gbe_priv *gbe_dev,
return -ENOMEM;
}
gbe_dev->hw_stats_prev =
devm_kzalloc(gbe_dev->dev,
gbe_dev->num_et_stats * sizeof(u32),
GFP_KERNEL);
if (!gbe_dev->hw_stats_prev) {
dev_err(gbe_dev->dev,
"hw_stats_prev memory allocation failed\n");
return -ENOMEM;
}
gbe_dev->ss_version = XGBE_SS_VERSION_10;
gbe_dev->sgmii_port_regs = gbe_dev->ss_regs +
XGBE10_SGMII_MODULE_OFFSET;
@ -2668,6 +2699,7 @@ static int set_gbe_ethss14_priv(struct gbe_priv *gbe_dev,
}
gbe_dev->switch_regs = regs;
gbe_dev->num_stats_mods = gbe_dev->max_num_slaves;
gbe_dev->et_stats = gbe13_et_stats;
gbe_dev->num_et_stats = ARRAY_SIZE(gbe13_et_stats);
@ -2679,6 +2711,16 @@ static int set_gbe_ethss14_priv(struct gbe_priv *gbe_dev,
return -ENOMEM;
}
gbe_dev->hw_stats_prev =
devm_kzalloc(gbe_dev->dev,
gbe_dev->num_et_stats * sizeof(u32),
GFP_KERNEL);
if (!gbe_dev->hw_stats_prev) {
dev_err(gbe_dev->dev,
"hw_stats_prev memory allocation failed\n");
return -ENOMEM;
}
gbe_dev->sgmii_port_regs = gbe_dev->ss_regs + GBE13_SGMII_MODULE_OFFSET;
gbe_dev->host_port_regs = gbe_dev->switch_regs + GBE13_HOST_PORT_OFFSET;
@ -2722,6 +2764,7 @@ static int set_gbenu_ethss_priv(struct gbe_priv *gbe_dev,
void __iomem *regs;
int i, ret;
gbe_dev->num_stats_mods = gbe_dev->max_num_ports;
gbe_dev->et_stats = gbenu_et_stats;
if (IS_SS_ID_NU(gbe_dev))
@ -2739,6 +2782,16 @@ static int set_gbenu_ethss_priv(struct gbe_priv *gbe_dev,
return -ENOMEM;
}
gbe_dev->hw_stats_prev =
devm_kzalloc(gbe_dev->dev,
gbe_dev->num_et_stats * sizeof(u32),
GFP_KERNEL);
if (!gbe_dev->hw_stats_prev) {
dev_err(gbe_dev->dev,
"hw_stats_prev memory allocation failed\n");
return -ENOMEM;
}
ret = of_address_to_resource(node, GBENU_SM_REG_INDEX, &res);
if (ret) {
dev_err(gbe_dev->dev,
@ -2797,7 +2850,7 @@ static int gbe_probe(struct netcp_device *netcp_device, struct device *dev,
struct cpsw_ale_params ale_params;
struct gbe_priv *gbe_dev;
u32 slave_num;
int ret = 0;
int i, ret = 0;
if (!node) {
dev_err(dev, "device tree info unavailable\n");
@ -2945,6 +2998,15 @@ static int gbe_probe(struct netcp_device *netcp_device, struct device *dev,
/* initialize host port */
gbe_init_host_port(gbe_dev);
spin_lock_bh(&gbe_dev->hw_stats_lock);
for (i = 0; i < gbe_dev->num_stats_mods; i++) {
if (gbe_dev->ss_version == GBE_SS_VERSION_14)
gbe_reset_mod_stats_ver14(gbe_dev, i);
else
gbe_reset_mod_stats(gbe_dev, i);
}
spin_unlock_bh(&gbe_dev->hw_stats_lock);
init_timer(&gbe_dev->timer);
gbe_dev->timer.data = (unsigned long)gbe_dev;
gbe_dev->timer.function = netcp_ethss_timer;
@ -2956,6 +3018,8 @@ static int gbe_probe(struct netcp_device *netcp_device, struct device *dev,
quit:
if (gbe_dev->hw_stats)
devm_kfree(dev, gbe_dev->hw_stats);
if (gbe_dev->hw_stats_prev)
devm_kfree(dev, gbe_dev->hw_stats_prev);
cpsw_ale_destroy(gbe_dev->ale);
if (gbe_dev->ss_regs)
devm_iounmap(dev, gbe_dev->ss_regs);