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Date: Mon, 8 Jul 2019 21:34:54 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Shannon Nelson <snelson@...sando.io>
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH v3 net-next 19/19] ionic: Add basic devlink interface
Mon, Jul 08, 2019 at 09:25:32PM CEST, snelson@...sando.io wrote:
>Add a devlink interface for access to information that isn't
>normally available through ethtool or the iplink interface.
>
>Example:
> $ ./devlink -j -p dev info pci/0000:b6:00.0
> {
> "info": {
> "pci/0000:b6:00.0": {
> "driver": "ionic",
> "serial_number": "FLM18420073",
> "versions": {
> "fixed": {
> "fw_version": "0.11.0-50",
> "fw_status": "0x1",
> "fw_heartbeat": "0x716ce",
> "asic_type": "0x0",
> "asic_rev": "0x0"
> }
> }
> }
> }
> }
>
>Signed-off-by: Shannon Nelson <snelson@...sando.io>
>---
> drivers/net/ethernet/pensando/ionic/Makefile | 2 +-
> drivers/net/ethernet/pensando/ionic/ionic.h | 1 +
> .../ethernet/pensando/ionic/ionic_bus_pci.c | 7 ++
> .../ethernet/pensando/ionic/ionic_devlink.c | 89 +++++++++++++++++++
> .../ethernet/pensando/ionic/ionic_devlink.h | 12 +++
> 5 files changed, 110 insertions(+), 1 deletion(-)
> create mode 100644 drivers/net/ethernet/pensando/ionic/ionic_devlink.c
> create mode 100644 drivers/net/ethernet/pensando/ionic/ionic_devlink.h
>
>diff --git a/drivers/net/ethernet/pensando/ionic/Makefile b/drivers/net/ethernet/pensando/ionic/Makefile
>index 4f3cfbf36c23..ce187c7b33a8 100644
>--- a/drivers/net/ethernet/pensando/ionic/Makefile
>+++ b/drivers/net/ethernet/pensando/ionic/Makefile
>@@ -5,4 +5,4 @@ obj-$(CONFIG_IONIC) := ionic.o
>
> ionic-y := ionic_main.o ionic_bus_pci.o ionic_dev.o ionic_ethtool.o \
> ionic_lif.o ionic_rx_filter.o ionic_txrx.o ionic_debugfs.o \
>- ionic_stats.o
>+ ionic_stats.o ionic_devlink.o
>diff --git a/drivers/net/ethernet/pensando/ionic/ionic.h b/drivers/net/ethernet/pensando/ionic/ionic.h
>index cd08166f73a9..a0034bc5b4a1 100644
>--- a/drivers/net/ethernet/pensando/ionic/ionic.h
>+++ b/drivers/net/ethernet/pensando/ionic/ionic.h
>@@ -44,6 +44,7 @@ struct ionic {
> DECLARE_BITMAP(intrs, INTR_CTRL_REGS_MAX);
> struct work_struct nb_work;
> struct notifier_block nb;
>+ struct devlink *dl;
> };
>
> struct ionic_admin_ctx {
>diff --git a/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c b/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
>index 98c12b770c7f..a8c99254489f 100644
>--- a/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
>+++ b/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
>@@ -10,6 +10,7 @@
> #include "ionic_bus.h"
> #include "ionic_lif.h"
> #include "ionic_debugfs.h"
>+#include "ionic_devlink.h"
>
> /* Supported devices */
> static const struct pci_device_id ionic_id_table[] = {
>@@ -212,9 +213,14 @@ static int ionic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> goto err_out_deinit_lifs;
> }
>
>+ err = ionic_devlink_register(ionic);
>+ if (err)
>+ dev_err(dev, "Cannot register devlink (ignored): %d\n", err);
>+
> return 0;
>
> err_out_deinit_lifs:
>+ ionic_devlink_unregister(ionic);
> ionic_lifs_deinit(ionic);
> err_out_free_lifs:
> ionic_lifs_free(ionic);
>@@ -247,6 +253,7 @@ static void ionic_remove(struct pci_dev *pdev)
> struct ionic *ionic = pci_get_drvdata(pdev);
>
> if (ionic) {
>+ ionic_devlink_unregister(ionic);
> ionic_lifs_unregister(ionic);
> ionic_lifs_deinit(ionic);
> ionic_lifs_free(ionic);
>diff --git a/drivers/net/ethernet/pensando/ionic/ionic_devlink.c b/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
>new file mode 100644
>index 000000000000..fbbfcdde292f
>--- /dev/null
>+++ b/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
>@@ -0,0 +1,89 @@
>+// SPDX-License-Identifier: GPL-2.0
>+/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
>+
>+#include <linux/module.h>
>+#include <linux/netdevice.h>
>+
>+#include "ionic.h"
>+#include "ionic_bus.h"
>+#include "ionic_lif.h"
>+#include "ionic_devlink.h"
>+
>+struct ionic_devlink {
>+ struct ionic *ionic;
>+};
>+
>+static int ionic_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
>+ struct netlink_ext_ack *extack)
>+{
>+ struct ionic *ionic = *(struct ionic **)devlink_priv(dl);
>+ struct ionic_dev *idev = &ionic->idev;
>+ char buf[16];
>+ u32 val;
>+
>+ devlink_info_driver_name_put(req, DRV_NAME);
>+
>+ devlink_info_version_fixed_put(req, "fw_version",
>+ idev->dev_info.fw_version);
>+
>+ val = ioread8(&idev->dev_info_regs->fw_status);
>+ snprintf(buf, sizeof(buf), "0x%x", val);
>+ devlink_info_version_fixed_put(req, "fw_status", buf);
>+
>+ val = ioread32(&idev->dev_info_regs->fw_heartbeat);
>+ snprintf(buf, sizeof(buf), "0x%x", val);
>+ devlink_info_version_fixed_put(req, "fw_heartbeat", buf);
>+
>+ snprintf(buf, sizeof(buf), "0x%x", idev->dev_info.asic_type);
>+ devlink_info_version_fixed_put(req, "asic_type", buf);
>+
>+ snprintf(buf, sizeof(buf), "0x%x", idev->dev_info.asic_rev);
>+ devlink_info_version_fixed_put(req, "asic_rev", buf);
>+
>+ devlink_info_serial_number_put(req, idev->dev_info.serial_num);
>+
>+ return 0;
>+}
>+
>+static const struct devlink_ops ionic_dl_ops = {
>+ .info_get = ionic_dl_info_get,
>+};
>+
>+int ionic_devlink_register(struct ionic *ionic)
>+{
>+ struct devlink *dl;
>+ struct ionic **ip;
>+ int err;
>+
>+ dl = devlink_alloc(&ionic_dl_ops, sizeof(struct ionic *));
Oups. Something is wrong with your flow. The devlink alloc is allocating
the structure that holds private data (per-device data) for you. This is
misuse :/
You are missing one parent device struct apparently.
Oh, I think I see something like it. The unused "struct ionic_devlink".
>+ if (!dl) {
>+ dev_warn(ionic->dev, "devlink_alloc failed");
>+ return -ENOMEM;
>+ }
>+
>+ ip = (struct ionic **)devlink_priv(dl);
>+ *ip = ionic;
>+ ionic->dl = dl;
>+
>+ err = devlink_register(dl, ionic->dev);
>+ if (err) {
>+ dev_warn(ionic->dev, "devlink_register failed: %d\n", err);
>+ goto err_dl_free;
>+ }
>+
>+ return 0;
>+
>+err_dl_free:
>+ ionic->dl = NULL;
>+ devlink_free(dl);
>+ return err;
>+}
>+
>+void ionic_devlink_unregister(struct ionic *ionic)
>+{
>+ if (!ionic->dl)
>+ return;
>+
>+ devlink_unregister(ionic->dl);
>+ devlink_free(ionic->dl);
>+}
>diff --git a/drivers/net/ethernet/pensando/ionic/ionic_devlink.h b/drivers/net/ethernet/pensando/ionic/ionic_devlink.h
>new file mode 100644
>index 000000000000..35528884e29f
>--- /dev/null
>+++ b/drivers/net/ethernet/pensando/ionic/ionic_devlink.h
>@@ -0,0 +1,12 @@
>+/* SPDX-License-Identifier: GPL-2.0 */
>+/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
>+
>+#ifndef _IONIC_DEVLINK_H_
>+#define _IONIC_DEVLINK_H_
>+
>+#include <net/devlink.h>
>+
>+int ionic_devlink_register(struct ionic *ionic);
>+void ionic_devlink_unregister(struct ionic *ionic);
>+
>+#endif /* _IONIC_DEVLINK_H_ */
>--
>2.17.1
>
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