[PATCH net-next 8/8] net: ethernet: ti: am65-cpsw: add multi port support in mac-only mode

Grygorii Strashko
2020-10-01T10:54:40Z

This patch adds final multi-port support to TI AM65x CPSW driver in
preparation for adding support for multi-port devices, like Main CPSW0 on
K3 J721E SoC or future CPSW3g on K3 AM64x SoC.
- the separate netdev is created for every enabled external Port;
- DMA channels are common/shared for all external Ports and the RX/TX NAPI
and DMA processing assigned to first netdev;
- external Ports are configured in mac-only mode, which is similar to TI
"dual-mac" mode for legacy TI CPSW - packets are sent to the Host port only
in ingress and directly to the Port on egress. No packet switching between
external ports happens.
- every port supports the same features as current AM65x CPSW on external
device.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
drivers/net/ethernet/ti/am65-cpsw-nuss.c | 111 ++++++++++++++---------
1 file changed, 70 insertions(+), 41 deletions(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index a8094e8e49ca..1658c4f305b5 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -272,8 +272,8 @@ static int am65_cpsw_nuss_ndo_slave_kill_vid(struct net_device *ndev,
return ret;
}

-static void am65_cpsw_slave_set_promisc_2g(struct am65_cpsw_port *port,
- bool promisc)
+static void am65_cpsw_slave_set_promisc(struct am65_cpsw_port *port,
+ bool promisc)
{
struct am65_cpsw_common *common = port->common;

@@ -298,7 +298,7 @@ static void am65_cpsw_nuss_ndo_slave_set_rx_mode(struct net_device *ndev)
bool promisc;

promisc = !!(ndev->flags & IFF_PROMISC);
- am65_cpsw_slave_set_promisc_2g(port, promisc);
+ am65_cpsw_slave_set_promisc(port, promisc);

if (promisc)
return;
@@ -631,13 +631,13 @@ static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)

am65_cpsw_port_set_sl_mac(port, ndev->dev_addr);

- if (port->slave.mac_only)
+ if (port->slave.mac_only) {
/* enable mac-only mode on port */
cpsw_ale_control_set(common->ale, port->port_id,
ALE_PORT_MACONLY, 1);
- if (AM65_CPSW_IS_CPSW2G(common))
cpsw_ale_control_set(common->ale, port->port_id,
ALE_PORT_NOLEARN, 1);
+ }

port_mask = BIT(port->port_id) | ALE_PORT_HOST;
cpsw_ale_add_ucast(common->ale, ndev->dev_addr,
@@ -1398,7 +1398,7 @@ static int am65_cpsw_nuss_ndo_slave_set_features(struct net_device *ndev,
return 0;
}

-static const struct net_device_ops am65_cpsw_nuss_netdev_ops_2g = {
+static const struct net_device_ops am65_cpsw_nuss_netdev_ops = {
.ndo_open = am65_cpsw_nuss_ndo_slave_open,
.ndo_stop = am65_cpsw_nuss_ndo_slave_stop,
.ndo_start_xmit = am65_cpsw_nuss_ndo_slave_xmit,
@@ -1855,14 +1855,18 @@ static void am65_cpsw_pcpu_stats_free(void *data)
free_percpu(stats);
}

-static int am65_cpsw_nuss_init_ndev_2g(struct am65_cpsw_common *common)
+static int
+am65_cpsw_nuss_init_port_ndev(struct am65_cpsw_common *common, u32 port_idx)
{
struct am65_cpsw_ndev_priv *ndev_priv;
struct device *dev = common->dev;
struct am65_cpsw_port *port;
int ret;

- port = am65_common_get_port(common, 1);
+ port = &common->ports[port_idx];
+
+ if (port->disabled)
+ return 0;

/* alloc netdev */
port->ndev = devm_alloc_etherdev_mqs(common->dev,
@@ -1891,7 +1895,7 @@ static int am65_cpsw_nuss_init_ndev_2g(struct am65_cpsw_common *common)
port->ndev->features = port->ndev->hw_features |
NETIF_F_HW_VLAN_CTAG_FILTER;
port->ndev->vlan_features |= NETIF_F_SG;
- port->ndev->netdev_ops = &am65_cpsw_nuss_netdev_ops_2g;
+ port->ndev->netdev_ops = &am65_cpsw_nuss_netdev_ops;
port->ndev->ethtool_ops = &am65_cpsw_ethtool_ops_slave;

/* Disable TX checksum offload by default due to HW bug */
@@ -1904,18 +1908,33 @@ static int am65_cpsw_nuss_init_ndev_2g(struct am65_cpsw_common *common)

ret = devm_add_action_or_reset(dev, am65_cpsw_pcpu_stats_free,
ndev_priv->stats);
- if (ret) {
- dev_err(dev, "Failed to add percpu stat free action %d\n", ret);
- return ret;
+ if (ret)
+ dev_err(dev, "failed to add percpu stat free action %d\n", ret);
+
+ return ret;
+}
+
+static int am65_cpsw_nuss_init_ndevs(struct am65_cpsw_common *common)
+{
+ struct am65_cpsw_port *port;
+ int ret;
+ int i;
+
+ for (i = 0; i < common->port_num; i++) {
+ ret = am65_cpsw_nuss_init_port_ndev(common, i);
+ if (ret)
+ return ret;
}

+ port = am65_common_get_port(common, 1);
+
netif_napi_add(port->ndev, &common->napi_rx,
am65_cpsw_nuss_rx_poll, NAPI_POLL_WEIGHT);

return ret;
}

-static int am65_cpsw_nuss_ndev_add_napi_2g(struct am65_cpsw_common *common)
+static int am65_cpsw_nuss_ndev_add_tx_napi(struct am65_cpsw_common *common)
{
struct device *dev = common->dev;
struct am65_cpsw_port *port;
@@ -1944,16 +1963,27 @@ static int am65_cpsw_nuss_ndev_add_napi_2g(struct am65_cpsw_common *common)
return ret;
}

-static int am65_cpsw_nuss_ndev_reg_2g(struct am65_cpsw_common *common)
+static void am65_cpsw_nuss_cleanup_ndev(struct am65_cpsw_common *common)
+{
+ struct am65_cpsw_port *port;
+ int i;
+
+ for (i = 0; i < common->port_num; i++) {
+ port = &common->ports[i];
+ if (port->ndev)
+ unregister_netdev(port->ndev);
+ }
+}
+
+static int am65_cpsw_nuss_register_ndevs(struct am65_cpsw_common *common)
{
struct device *dev = common->dev;
struct am65_cpsw_port *port;
- int ret = 0;
+ int ret = 0, i;

- port = am65_common_get_port(common, 1);
- ret = am65_cpsw_nuss_ndev_add_napi_2g(common);
+ ret = am65_cpsw_nuss_ndev_add_tx_napi(common);
if (ret)
- goto err;
+ return ret;

ret = devm_request_irq(dev, common->rx_chns.irq,
am65_cpsw_nuss_rx_irq,
@@ -1961,17 +1991,31 @@ static int am65_cpsw_nuss_ndev_reg_2g(struct am65_cpsw_common *common)
if (ret) {
dev_err(dev, "failure requesting rx irq %u, %d\n",
common->rx_chns.irq, ret);
- goto err;
+ return ret;
+ }
+
+ for (i = 0; i < common->port_num; i++) {
+ port = &common->ports[i];
+
+ if (!port->ndev)
+ continue;
+
+ ret = register_netdev(port->ndev);
+ if (ret) {
+ dev_err(dev, "error registering slave net device%i %d\n",
+ i, ret);
+ goto err_cleanup_ndev;
+ }
}

- ret = register_netdev(port->ndev);
- if (ret)
- dev_err(dev, "error registering slave net device %d\n", ret);

/* can't auto unregister ndev using devm_add_action() due to
* devres release sequence in DD core for DMA
*/
-err:
+ return 0;
+
+err_cleanup_ndev:
+ am65_cpsw_nuss_cleanup_ndev(common);
return ret;
}

@@ -1984,19 +2028,7 @@ int am65_cpsw_nuss_update_tx_chns(struct am65_cpsw_common *common, int num_tx)
if (ret)
return ret;

- return am65_cpsw_nuss_ndev_add_napi_2g(common);
-}
-
-static void am65_cpsw_nuss_cleanup_ndev(struct am65_cpsw_common *common)
-{
- struct am65_cpsw_port *port;
- int i;
-
- for (i = 0; i < common->port_num; i++) {
- port = &common->ports[i];
- if (port->ndev)
- unregister_netdev(port->ndev);
- }
+ return am65_cpsw_nuss_ndev_add_tx_napi(common);
}

struct am65_cpsw_soc_pdata {
@@ -2084,9 +2116,6 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)
return -ENOENT;
of_node_put(node);

- if (common->port_num != 1)
- return -EOPNOTSUPP;
-
common->rx_flow_id_base = -1;
init_completion(&common->tdown_complete);
common->tx_ch_num = 1;
@@ -2181,11 +2210,11 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)

dev_set_drvdata(dev, common);

- ret = am65_cpsw_nuss_init_ndev_2g(common);
+ ret = am65_cpsw_nuss_init_ndevs(common);
if (ret)
goto err_of_clear;

- ret = am65_cpsw_nuss_ndev_reg_2g(common);
+ ret = am65_cpsw_nuss_register_ndevs(common);
if (ret)
goto err_of_clear;

--
2.17.1