sfc: add devlink support for ef100

Add devlink infrastructure support. Further patches add devlink
info and devlink port support.

Signed-off-by: Alejandro Lucero <alejandro.lucero-palau@amd.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Martin Habets <habetsm.xilinx@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/sfc/Kconfig b/drivers/net/ethernet/sfc/Kconfig
index 0950e6b..4af36ba 100644 (file)
--- a/drivers/net/ethernet/sfc/Kconfig
+++ b/drivers/net/ethernet/sfc/Kconfig
@@ -22,6 +22,7 @@ config SFC
        depends on PTP_1588_CLOCK_OPTIONAL
        select MDIO
        select CRC32
+       select NET_DEVLINK
        help
          This driver supports 10/40-gigabit Ethernet cards based on
          the Solarflare SFC9100-family controllers.

diff --git a/drivers/net/ethernet/sfc/Makefile b/drivers/net/ethernet/sfc/Makefile
index 712a48d..55b9c73 100644 (file)
--- a/drivers/net/ethernet/sfc/Makefile
+++ b/drivers/net/ethernet/sfc/Makefile
@@ -6,7 +6,8 @@ sfc-y                   += efx.o efx_common.o efx_channels.o nic.o \
                           mcdi.o mcdi_port.o mcdi_port_common.o \
                           mcdi_functions.o mcdi_filters.o mcdi_mon.o \
                           ef100.o ef100_nic.o ef100_netdev.o \
-                          ef100_ethtool.o ef100_rx.o ef100_tx.o
+                          ef100_ethtool.o ef100_rx.o ef100_tx.o \
+                          efx_devlink.o
 sfc-$(CONFIG_SFC_MTD)  += mtd.o
 sfc-$(CONFIG_SFC_SRIOV)        += sriov.o ef10_sriov.o ef100_sriov.o ef100_rep.o \
                            mae.o tc.o tc_bindings.o tc_counters.o

diff --git a/drivers/net/ethernet/sfc/ef100_netdev.c b/drivers/net/ethernet/sfc/ef100_netdev.c
index ddcc325..6cf7478 100644 (file)
--- a/drivers/net/ethernet/sfc/ef100_netdev.c
+++ b/drivers/net/ethernet/sfc/ef100_netdev.c
@@ -24,6 +24,7 @@
 #include "rx_common.h"
 #include "ef100_sriov.h"
 #include "tc_bindings.h"
+#include "efx_devlink.h"
 
 static void ef100_update_name(struct efx_nic *efx)
 {
@@ -332,6 +333,7 @@ void ef100_remove_netdev(struct efx_probe_data *probe_data)
                efx_ef100_pci_sriov_disable(efx, true);
 #endif
 
+       efx_fini_devlink_lock(efx);
        ef100_unregister_netdev(efx);
 
 #ifdef CONFIG_SFC_SRIOV
@@ -345,6 +347,8 @@ void ef100_remove_netdev(struct efx_probe_data *probe_data)
        kfree(efx->phy_data);
        efx->phy_data = NULL;
 
+       efx_fini_devlink_and_unlock(efx);
+
        free_netdev(efx->net_dev);
        efx->net_dev = NULL;
        efx->state = STATE_PROBED;
@@ -405,6 +409,11 @@ int ef100_probe_netdev(struct efx_probe_data *probe_data)
        /* Don't fail init if RSS setup doesn't work. */
        efx_mcdi_push_default_indir_table(efx, efx->n_rx_channels);
 
+       /* devlink creation, registration and lock */
+       rc = efx_probe_devlink_and_lock(efx);
+       if (rc)
+               pci_info(efx->pci_dev, "devlink registration failed");
+
        rc = ef100_register_netdev(efx);
        if (rc)
                goto fail;
@@ -424,5 +433,6 @@ int ef100_probe_netdev(struct efx_probe_data *probe_data)
        }
 
 fail:
+       efx_probe_devlink_unlock(efx);
        return rc;
 }

diff --git a/drivers/net/ethernet/sfc/efx_devlink.c b/drivers/net/ethernet/sfc/efx_devlink.c
new file mode 100644 (file)
index 0000000..10c96a9
--- /dev/null
+++ b/drivers/net/ethernet/sfc/efx_devlink.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/****************************************************************************
+ * Driver for AMD network controllers and boards
+ * Copyright (C) 2023, Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation, incorporated herein by reference.
+ */
+
+#include "net_driver.h"
+#include "efx_devlink.h"
+
+struct efx_devlink {
+       struct efx_nic *efx;
+};
+
+static const struct devlink_ops sfc_devlink_ops = {
+};
+
+void efx_fini_devlink_lock(struct efx_nic *efx)
+{
+       if (efx->devlink)
+               devl_lock(efx->devlink);
+}
+
+void efx_fini_devlink_and_unlock(struct efx_nic *efx)
+{
+       if (efx->devlink) {
+               devl_unregister(efx->devlink);
+               devl_unlock(efx->devlink);
+               devlink_free(efx->devlink);
+               efx->devlink = NULL;
+       }
+}
+
+int efx_probe_devlink_and_lock(struct efx_nic *efx)
+{
+       struct efx_devlink *devlink_private;
+
+       if (efx->type->is_vf)
+               return 0;
+
+       efx->devlink = devlink_alloc(&sfc_devlink_ops,
+                                    sizeof(struct efx_devlink),
+                                    &efx->pci_dev->dev);
+       if (!efx->devlink)
+               return -ENOMEM;
+
+       devl_lock(efx->devlink);
+       devlink_private = devlink_priv(efx->devlink);
+       devlink_private->efx = efx;
+
+       devl_register(efx->devlink);
+
+       return 0;
+}
+
+void efx_probe_devlink_unlock(struct efx_nic *efx)
+{
+       if (!efx->devlink)
+               return;
+
+       devl_unlock(efx->devlink);
+}

diff --git a/drivers/net/ethernet/sfc/efx_devlink.h b/drivers/net/ethernet/sfc/efx_devlink.h
new file mode 100644 (file)
index 0000000..8ff85b0
--- /dev/null
+++ b/drivers/net/ethernet/sfc/efx_devlink.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/****************************************************************************
+ * Driver for AMD network controllers and boards
+ * Copyright (C) 2023, Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation, incorporated herein by reference.
+ */
+
+#ifndef _EFX_DEVLINK_H
+#define _EFX_DEVLINK_H
+
+#include "net_driver.h"
+#include <net/devlink.h>
+
+int efx_probe_devlink_and_lock(struct efx_nic *efx);
+void efx_probe_devlink_unlock(struct efx_nic *efx);
+void efx_fini_devlink_lock(struct efx_nic *efx);
+void efx_fini_devlink_and_unlock(struct efx_nic *efx);
+
+#endif /* _EFX_DEVLINK_H */

diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 3b49e21..d036641 100644 (file)
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -994,6 +994,7 @@ enum efx_xdp_tx_queues_mode {
  *      xdp_rxq_info structures?
  * @netdev_notifier: Netdevice notifier.
  * @tc: state for TC offload (EF100).
+ * @devlink: reference to devlink structure owned by this device
  * @mem_bar: The BAR that is mapped into membase.
  * @reg_base: Offset from the start of the bar to the function control window.
  * @monitor_work: Hardware monitor workitem
@@ -1179,6 +1180,7 @@ struct efx_nic {
        struct notifier_block netdev_notifier;
        struct efx_tc_state *tc;
 
+       struct devlink *devlink;
        unsigned int mem_bar;
        u32 reg_base;