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Subject[net-next PATCH v2 3/3] drivers: net: cpsw: Add support for multicast/broadcast rate limit
Date
Add support for multicast/broadcast rate limit feature via ethtool coalesce.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
---
drivers/net/ethernet/ti/cpsw.c | 80 ++++++++++++++++++++++++++++++++++++++++--
1 file changed, 78 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index a6117e6..2a984e6 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -403,6 +403,8 @@ struct cpsw_priv {
bool irq_enabled;
struct cpts *cpts;
u32 emac_port;
+ u32 rx_max_mcast;
+ u32 rx_max_bcast;
};

struct cpsw_stats {
@@ -871,11 +873,13 @@ static int cpsw_get_coalesce(struct net_device *ndev,
struct cpsw_priv *priv = netdev_priv(ndev);

coal->rx_coalesce_usecs = priv->coal_intvl;
+ coal->rx_max_mcast = priv->rx_max_mcast;
+ coal->rx_max_bcast = priv->rx_max_bcast;
return 0;
}

-static int cpsw_set_coalesce(struct net_device *ndev,
- struct ethtool_coalesce *coal)
+static int cpsw_set_coalesce_usecs(struct net_device *ndev,
+ struct ethtool_coalesce *coal)
{
struct cpsw_priv *priv = netdev_priv(ndev);
u32 int_ctrl;
@@ -933,6 +937,74 @@ static int cpsw_set_coalesce(struct net_device *ndev,
return 0;
}

+static int cpsw_set_coalesce_mcast(struct net_device *ndev,
+ struct ethtool_coalesce *coal)
+{
+ struct cpsw_priv *priv = netdev_priv(ndev);
+ int port;
+
+ priv->rx_max_mcast = coal->rx_max_mcast;
+
+ if (priv->data.dual_emac)
+ port = priv->emac_port;
+ else
+ port = priv->data.active_slave;
+
+ cpsw_ale_control_set(priv->ale, port, ALE_PORT_MCAST_LIMIT,
+ coal->rx_max_mcast);
+
+ dev_dbg(priv->dev, "rx_max_mcast set to %d\n", priv->rx_max_mcast);
+ return 0;
+}
+
+static int cpsw_set_coalesce_bcast(struct net_device *ndev,
+ struct ethtool_coalesce *coal)
+{
+ struct cpsw_priv *priv = netdev_priv(ndev);
+ int port;
+
+ priv->rx_max_bcast = coal->rx_max_bcast;
+
+ if (priv->data.dual_emac)
+ port = priv->emac_port + 1;
+ else
+ port = priv->data.active_slave + 1;
+
+ cpsw_ale_control_set(priv->ale, port, ALE_PORT_BCAST_LIMIT,
+ coal->rx_max_bcast);
+
+ dev_dbg(priv->dev, "rx_max_mcast set to %d\n", priv->rx_max_bcast);
+ return 0;
+}
+
+static int cpsw_set_coalesce(struct net_device *ndev,
+ struct ethtool_coalesce *coal)
+{
+ int ret = -EINVAL;
+
+ if (coal->rx_coalesce_usecs) {
+ ret = cpsw_set_coalesce_usecs(ndev, coal);
+ if (ret) {
+ dev_err(&ndev->dev, "set rx-usecs failed\n");
+ return ret;
+ }
+ }
+
+ ret = cpsw_set_coalesce_mcast(ndev, coal);
+ if (ret) {
+ dev_err(&ndev->dev, "set coalesce rx-max-mcast failed\n");
+ return ret;
+ }
+
+ ret = cpsw_set_coalesce_bcast(ndev, coal);
+ if (ret) {
+ dev_err(&ndev->dev, "set coalesce rx-max-bcast failed\n");
+ return ret;
+ }
+
+ return ret;
+}
+
static int cpsw_get_sset_count(struct net_device *ndev, int sset)
{
switch (sset) {
@@ -1227,6 +1299,10 @@ static int cpsw_ndo_open(struct net_device *ndev)
/* enable statistics collection only on all ports */
__raw_writel(0x7, &priv->regs->stat_port_en);

+ /* Enable rate limit feature in the switch for rx only */
+ cpsw_ale_control_set(priv->ale, 0, ALE_RATE_LIMIT, 1);
+ cpsw_ale_control_set(priv->ale, 0, ALE_RATE_LIMIT_TX, 0);
+
if (WARN_ON(!priv->data.rx_descs))
priv->data.rx_descs = 128;

--
2.0.0.390.gcb682f8


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