[PATCH 03/15] net: hbl_cn: physical layer support

Omer Shpigelman
2024-06-13T08:28:42Z

Add a common physical (PHY) layer initialization and link notification.
An notification is sent on every link up/down change.

Signed-off-by: Omer Shpigelman <oshpigelman@habana.ai>
Co-developed-by: Abhilash K V <kvabhilash@habana.ai>
Signed-off-by: Abhilash K V <kvabhilash@habana.ai>
Co-developed-by: Andrey Agranovich <aagranovich@habana.ai>
Signed-off-by: Andrey Agranovich <aagranovich@habana.ai>
Co-developed-by: Bharat Jauhari <bjauhari@habana.ai>
Signed-off-by: Bharat Jauhari <bjauhari@habana.ai>
Co-developed-by: David Meriin <dmeriin@habana.ai>
Signed-off-by: David Meriin <dmeriin@habana.ai>
Co-developed-by: Sagiv Ozeri <sozeri@habana.ai>
Signed-off-by: Sagiv Ozeri <sozeri@habana.ai>
Co-developed-by: Zvika Yehudai <zyehudai@habana.ai>
Signed-off-by: Zvika Yehudai <zyehudai@habana.ai>
---
.../ethernet/intel/hbl_cn/common/hbl_cn_phy.c | 201 ++++++++++++++++++
1 file changed, 201 insertions(+)

diff --git a/drivers/net/ethernet/intel/hbl_cn/common/hbl_cn_phy.c b/drivers/net/ethernet/intel/hbl_cn/common/hbl_cn_phy.c
index 0d07cd78221d..6753d54ae2b0 100644
--- a/drivers/net/ethernet/intel/hbl_cn/common/hbl_cn_phy.c
+++ b/drivers/net/ethernet/intel/hbl_cn/common/hbl_cn_phy.c
@@ -4,30 +4,231 @@
* All Rights Reserved.
*/

+#include <linux/firmware.h>
#include "hbl_cn.h"

+static void port_reset_state(struct hbl_cn_port *cn_port)
+{
+ cn_port->pcs_link = false;
+ cn_port->eq_pcs_link = false;
+ cn_port->auto_neg_resolved = false;
+ cn_port->auto_neg_skipped = false;
+ cn_port->phy_fw_tuned = false;
+ cn_port->retry_cnt = 0;
+ cn_port->pcs_remote_fault_seq_cnt = 0;
+ cn_port->pcs_link_restore_cnt = 0;
+ cn_port->correctable_errors_cnt = 0;
+ cn_port->uncorrectable_errors_cnt = 0;
+}
+
+static u32 get_data_rate(struct hbl_cn_port *cn_port)
+{
+ struct hbl_cn_device *hdev = cn_port->hdev;
+ u32 port, speed, data_rate;
+
+ port = cn_port->port;
+ speed = cn_port->speed;
+
+ switch (speed) {
+ case SPEED_10000:
+ data_rate = NIC_DR_10;
+ break;
+ case SPEED_25000:
+ data_rate = NIC_DR_25;
+ break;
+ case SPEED_50000:
+ data_rate = NIC_DR_50;
+ break;
+ case SPEED_100000:
+ data_rate = NIC_DR_50;
+ break;
+ case SPEED_200000:
+ data_rate = NIC_DR_100;
+ break;
+ case SPEED_400000:
+ data_rate = NIC_DR_100;
+ break;
+ default:
+ data_rate = NIC_DR_50;
+ dev_err(hdev->dev, "unknown port %d speed, continue with 50 GHz\n", port);
+ break;
+ }
+
+ dev_dbg(hdev->dev, "port %d, speed %d data rate %d\n", port, speed, data_rate);
+
+ return data_rate;
+}
+
void hbl_cn_phy_set_port_status(struct hbl_cn_port *cn_port, bool up)
{
+ struct hbl_cn_device *hdev = cn_port->hdev;
+ struct hbl_cn_asic_port_funcs *port_funcs;
+ struct hbl_en_aux_ops *aux_ops;
+ struct hbl_aux_dev *aux_dev;
+ u32 port = cn_port->port;
+ bool is_ibdev;
+ int rc;
+
+ aux_dev = &hdev->en_aux_dev;
+ aux_ops = aux_dev->aux_ops;
+ port_funcs = hdev->asic_funcs->port_funcs;
+ is_ibdev = hbl_cn_is_ibdev(hdev);
+
+ port_funcs->set_port_status(cn_port, up);
+
+ if (cn_port->eth_enable) {
+ if (aux_ops->set_port_status)
+ aux_ops->set_port_status(aux_dev, port, up);
+ } else {
+ if (hdev->ctx)
+ dev_info(hdev->dev, "Card %u Port %u: link %s\n",
+ hdev->card_location, port, up ? "up" : "down");
+ else
+ dev_dbg(hdev->dev, "Card %u Port %u: link %s\n",
+ hdev->card_location, port, up ? "up" : "down");
+ }
+
+ /* IB flow. User polls for IB events.
+ * - internal ports: Enqueue link event in EQ dispatcher. IB event would be dispatched in
+ * response.
+ * - external ports: Do not enqueue. hbl IB driver dispatches IB events from netdev
+ * notifier chain handler.
+ * non-IB flow. User polls for EQ events.
+ * - internal ports: Enqueue link event in EQ dispatcher.
+ * - external ports: Enqueue link event in EQ dispatcher.
+ */
+ if (!is_ibdev || !cn_port->eth_enable) {
+ if (hdev->has_eq) {
+ rc = hbl_cn_eq_dispatcher_enqueue_bcast(cn_port, &cn_port->link_eqe);
+ if (rc)
+ dev_dbg_ratelimited(hdev->dev,
+ "Port %d, failed to dispatch link event %s, %d\n",
+ port, up ? "up" : "down", rc);
+ }
+ }
+
+ cn_port->port_toggle_cnt++;
+
+ /* The FEC counters are relevant during the time that link is UP, hence reset them here */
+ if (up) {
+ cn_port->correctable_errors_cnt = 0;
+ cn_port->uncorrectable_errors_cnt = 0;
+ }
+
+ if (hdev->pldm) {
+ dev_dbg(hdev->dev, "%s: port %u\n", __func__, port);
+ msleep(1000);
+ }
}

int hbl_cn_phy_init(struct hbl_cn_port *cn_port)
{
+ struct hbl_cn_device *hdev = cn_port->hdev;
+ struct hbl_cn_asic_port_funcs *port_funcs;
+ int rc;
+
+ port_funcs = hdev->asic_funcs->port_funcs;
+
+ /* If mac_loopback is enabled on this port, move the port status to UP state */
+ if (cn_port->mac_loopback) {
+ cn_port->pcs_link = true;
+ hbl_cn_phy_set_port_status(cn_port, true);
+ return 0;
+ }
+
+ if (!hdev->phy_config_fw) {
+ /* If EQ is supported, it will take care of setting the port status */
+ if (!hdev->has_eq) {
+ cn_port->pcs_link = true;
+ hbl_cn_phy_set_port_status(cn_port, true);
+ }
+
+ return 0;
+ }
+
+ cn_port->data_rate = get_data_rate(cn_port);
+
+ rc = port_funcs->phy_port_power_up(cn_port);
+ if (rc) {
+ dev_err(hdev->dev, "ASIC specific phy port power-up failed, %d\n", rc);
+ return rc;
+ }
+
+ port_funcs->phy_port_start_stop(cn_port, true);
+
+ queue_delayed_work(cn_port->wq, &cn_port->link_status_work, msecs_to_jiffies(1));
+
return 0;
}

+/* This function does not change the port link status in order to avoid unnecessary netdev actions
+ * and prints. Hence it should be done from outside.
+ */
void hbl_cn_phy_fini(struct hbl_cn_port *cn_port)
{
+ struct hbl_cn_device *hdev = cn_port->hdev;
+ struct hbl_cn_asic_port_funcs *port_funcs;
+
+ /* This is done before the check because we support setting mac loopback for a specific port
+ * and this function might be called when cn_port->mac_loopback is true (during the port
+ * reset after setting mac loopback), but the link status work was scheduled before (when
+ * the port was opened w/o mac loopback).
+ */
+ cancel_delayed_work_sync(&cn_port->link_status_work);
+
+ port_funcs = hdev->asic_funcs->port_funcs;
+
+ if (!hdev->phy_config_fw || cn_port->mac_loopback) {
+ cn_port->pcs_link = false;
+ cn_port->eq_pcs_link = false;
+ return;
+ }
+
+ port_reset_state(cn_port);
+ port_funcs->phy_port_start_stop(cn_port, false);
}

void hbl_cn_phy_port_reconfig(struct hbl_cn_port *cn_port)
{
+ struct hbl_cn_device *hdev = cn_port->hdev;
+ struct hbl_cn_asic_port_funcs *port_funcs;
+
+ port_funcs = hdev->asic_funcs->port_funcs;
+
+ port_funcs->phy_port_reconfig(cn_port);
+
+ port_reset_state(cn_port);
}

int hbl_cn_phy_has_binary_fw(struct hbl_cn_device *hdev)
{
+ struct hbl_cn_asic_funcs *asic_funcs = hdev->asic_funcs;
+ const struct firmware *fw;
+ const char *fw_name;
+ int rc;
+
+ fw_name = asic_funcs->get_phy_fw_name();
+
+ rc = request_firmware(&fw, fw_name, hdev->dev);
+ if (rc) {
+ dev_err(hdev->dev, "Firmware file %s is not found!\n", fw_name);
+ return rc;
+ }
+
+ release_firmware(fw);
+
return 0;
}

void hbl_cn_phy_set_fw_polarity(struct hbl_cn_device *hdev)
{
+ struct hbl_cn_cpucp_info *cpucp_info;
+
+ if (hdev->skip_phy_pol_cfg)
+ return;
+
+ cpucp_info = hdev->cpucp_info;
+
+ hdev->pol_tx_mask = cpucp_info->pol_tx_mask[0];
+ hdev->pol_rx_mask = cpucp_info->pol_rx_mask[0];
}
--
2.34.1