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Date: Tue, 27 Aug 2019 14:22:55 -0700
From: Shannon Nelson <snelson@...sando.io>
To: Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH v5 net-next 02/18] ionic: Add hardware init and device
commands
On 8/26/19 9:24 PM, Jakub Kicinski wrote:
> On Mon, 26 Aug 2019 14:33:23 -0700, Shannon Nelson wrote:
>> The ionic device has a small set of PCI registers, including a
>> device control and data space, and a large set of message
>> commands.
>>
>> Signed-off-by: Shannon Nelson <snelson@...sando.io>
>> diff --git a/drivers/net/ethernet/pensando/ionic/Makefile b/drivers/net/ethernet/pensando/ionic/Makefile
>> index f174e8f7bce1..a23d58519c63 100644
>> --- a/drivers/net/ethernet/pensando/ionic/Makefile
>> +++ b/drivers/net/ethernet/pensando/ionic/Makefile
>> @@ -3,4 +3,5 @@
>>
>> obj-$(CONFIG_IONIC) := ionic.o
>>
>> -ionic-y := ionic_main.o ionic_bus_pci.o ionic_devlink.o
>> +ionic-y := ionic_main.o ionic_bus_pci.o ionic_devlink.o ionic_dev.o \
>> + ionic_debugfs.o
>> diff --git a/drivers/net/ethernet/pensando/ionic/ionic.h b/drivers/net/ethernet/pensando/ionic/ionic.h
>> index d40077161214..1f3c4a916849 100644
>> --- a/drivers/net/ethernet/pensando/ionic/ionic.h
>> +++ b/drivers/net/ethernet/pensando/ionic/ionic.h
>> @@ -4,6 +4,10 @@
>> #ifndef _IONIC_H_
>> #define _IONIC_H_
>>
>> +#include "ionic_if.h"
>> +#include "ionic_dev.h"
>> +#include "ionic_devlink.h"
>> +
>> #define IONIC_DRV_NAME "ionic"
>> #define IONIC_DRV_DESCRIPTION "Pensando Ethernet NIC Driver"
>> #define IONIC_DRV_VERSION "0.15.0-k"
>> @@ -17,10 +21,27 @@
>> #define IONIC_SUBDEV_ID_NAPLES_100_4 0x4001
>> #define IONIC_SUBDEV_ID_NAPLES_100_8 0x4002
>>
>> +#define devcmd_timeout 10
> nit: upper case?
Sure
>
>> struct ionic {
>> struct pci_dev *pdev;
>> struct device *dev;
>> struct devlink *dl;
>> + struct devlink_port dl_port;
> devlink_port is not used in this patch
I can move that to patch 09 where it gets used
>
>> + struct ionic_dev idev;
>> + struct mutex dev_cmd_lock; /* lock for dev_cmd operations */
>> + struct dentry *dentry;
>> + struct ionic_dev_bar bars[IONIC_BARS_MAX];
>> + unsigned int num_bars;
>> + struct ionic_identity ident;
>> };
>> + err = ionic_init(ionic);
>> + if (err) {
>> + dev_err(dev, "Cannot init device: %d, aborting\n", err);
>> + goto err_out_teardown;
>> + }
>> +
>> + err = ionic_devlink_register(ionic);
>> + if (err)
>> + dev_err(dev, "Cannot register devlink: %d\n", err);
>>
>> return 0;
>> +
>> +err_out_teardown:
>> + ionic_dev_teardown(ionic);
>> +err_out_unmap_bars:
>> + ionic_unmap_bars(ionic);
>> + pci_release_regions(pdev);
>> +err_out_pci_clear_master:
>> + pci_clear_master(pdev);
>> +err_out_pci_disable_device:
>> + pci_disable_device(pdev);
>> +err_out_debugfs_del_dev:
>> + ionic_debugfs_del_dev(ionic);
>> +err_out_clear_drvdata:
>> + mutex_destroy(&ionic->dev_cmd_lock);
>> + ionic_devlink_free(ionic);
>> +
>> + return err;
>> }
>>
>> static void ionic_remove(struct pci_dev *pdev)
>> {
>> struct ionic *ionic = pci_get_drvdata(pdev);
>>
>> + if (!ionic)
> How can this be NULL? Usually if this is NULL that means probe()
> failed but 'err' was not set properly. Perhaps WARN_ON() here?
Yes, pretty unlikely, but seems worth checking.
>
>> + return;
>> +
>> + ionic_devlink_unregister(ionic);
>> + ionic_reset(ionic);
>> + ionic_dev_teardown(ionic);
>> + ionic_unmap_bars(ionic);
>> + pci_release_regions(pdev);
>> + pci_clear_master(pdev);
>> + pci_disable_device(pdev);
>> + ionic_debugfs_del_dev(ionic);
>> + mutex_destroy(&ionic->dev_cmd_lock);
>> ionic_devlink_free(ionic);
>> }
>>
>> diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.h b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
>> new file mode 100644
>> index 000000000000..30a5206bba4e
>> --- /dev/null
>> +++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
>> @@ -0,0 +1,143 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
>> +
>> +#ifndef _IONIC_DEV_H_
>> +#define _IONIC_DEV_H_
>> +
>> +#include <linux/mutex.h>
>> +#include <linux/workqueue.h>
>> +
>> +#include "ionic_if.h"
>> +#include "ionic_regs.h"
>> +
>> +struct ionic_dev_bar {
>> + void __iomem *vaddr;
>> + phys_addr_t bus_addr;
>> + unsigned long len;
>> + int res_index;
>> +};
>> +
>> +static inline void ionic_struct_size_checks(void)
>> +{
>> + /* Registers */
>> + BUILD_BUG_ON(sizeof(struct ionic_intr) != 32);
>> +
>> + BUILD_BUG_ON(sizeof(struct ionic_doorbell) != 8);
>> + BUILD_BUG_ON(sizeof(struct ionic_intr_status) != 8);
>> +
>> + BUILD_BUG_ON(sizeof(union ionic_dev_regs) != 4096);
>> + BUILD_BUG_ON(sizeof(union ionic_dev_info_regs) != 2048);
>> + BUILD_BUG_ON(sizeof(union ionic_dev_cmd_regs) != 2048);
>> +
>> + BUILD_BUG_ON(sizeof(struct ionic_lif_stats) != 1024);
>> +
>> + BUILD_BUG_ON(sizeof(struct ionic_admin_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_admin_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_nop_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_nop_comp) != 16);
>> +
>> + /* Device commands */
>> + BUILD_BUG_ON(sizeof(struct ionic_dev_identify_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_dev_identify_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_dev_init_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_dev_init_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_dev_reset_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_dev_reset_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_dev_getattr_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_dev_getattr_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_dev_setattr_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_dev_setattr_comp) != 16);
>> +
>> + /* Port commands */
>> + BUILD_BUG_ON(sizeof(struct ionic_port_identify_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_port_identify_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_port_init_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_port_init_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_port_reset_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_port_reset_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_port_getattr_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_port_getattr_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_port_setattr_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_port_setattr_comp) != 16);
>> +
>> + /* LIF commands */
>> + BUILD_BUG_ON(sizeof(struct ionic_lif_init_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_lif_init_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_lif_reset_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(ionic_lif_reset_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_lif_getattr_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_lif_getattr_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_lif_setattr_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_lif_setattr_comp) != 16);
>> +
>> + BUILD_BUG_ON(sizeof(struct ionic_q_init_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_q_init_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_q_control_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(ionic_q_control_comp) != 16);
>> +
>> + BUILD_BUG_ON(sizeof(struct ionic_rx_mode_set_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(ionic_rx_mode_set_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_rx_filter_add_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_rx_filter_add_comp) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_rx_filter_del_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(ionic_rx_filter_del_comp) != 16);
>> +
>> + /* RDMA commands */
>> + BUILD_BUG_ON(sizeof(struct ionic_rdma_reset_cmd) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_rdma_queue_cmd) != 64);
>> +
>> + /* Events */
>> + BUILD_BUG_ON(sizeof(struct ionic_notifyq_cmd) != 4);
>> + BUILD_BUG_ON(sizeof(union ionic_notifyq_comp) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_notifyq_event) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_link_change_event) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_reset_event) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_heartbeat_event) != 64);
>> + BUILD_BUG_ON(sizeof(struct ionic_log_event) != 64);
>> +
>> + /* I/O */
>> + BUILD_BUG_ON(sizeof(struct ionic_txq_desc) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_txq_sg_desc) != 128);
>> + BUILD_BUG_ON(sizeof(struct ionic_txq_comp) != 16);
>> +
>> + BUILD_BUG_ON(sizeof(struct ionic_rxq_desc) != 16);
>> + BUILD_BUG_ON(sizeof(struct ionic_rxq_sg_desc) != 128);
>> + BUILD_BUG_ON(sizeof(struct ionic_rxq_comp) != 16);
> static_assert() for all of those? That way you don't need this fake
> function.
Sure
>
>> +}
>> +
>> +struct ionic_devinfo {
>> + u8 asic_type;
>> + u8 asic_rev;
>> + char fw_version[IONIC_DEVINFO_FWVERS_BUFLEN + 1];
>> + char serial_num[IONIC_DEVINFO_SERIAL_BUFLEN + 1];
>> +};
>> +
>> +struct ionic_dev {
>> + union ionic_dev_info_regs __iomem *dev_info_regs;
>> + union ionic_dev_cmd_regs __iomem *dev_cmd_regs;
>> +
>> + u64 __iomem *db_pages;
>> + dma_addr_t phy_db_pages;
>> +
>> + struct ionic_intr __iomem *intr_ctrl;
>> + u64 __iomem *intr_status;
>> +
>> + struct ionic_devinfo dev_info;
>> +};
>> +
>> +struct ionic;
>> +
>> +void ionic_init_devinfo(struct ionic *ionic);
>> +int ionic_dev_setup(struct ionic *ionic);
>> +void ionic_dev_teardown(struct ionic *ionic);
>> +
>> +void ionic_dev_cmd_go(struct ionic_dev *idev, union ionic_dev_cmd *cmd);
>> +u8 ionic_dev_cmd_status(struct ionic_dev *idev);
>> +bool ionic_dev_cmd_done(struct ionic_dev *idev);
>> +void ionic_dev_cmd_comp(struct ionic_dev *idev, union ionic_dev_cmd_comp *comp);
>> +
>> +void ionic_dev_cmd_identify(struct ionic_dev *idev, u8 ver);
>> +void ionic_dev_cmd_init(struct ionic_dev *idev);
>> +void ionic_dev_cmd_reset(struct ionic_dev *idev);
>> +
>> +#endif /* _IONIC_DEV_H_ */
>> diff --git a/drivers/net/ethernet/pensando/ionic/ionic_devlink.c b/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
>> index e24ef6971cd5..1ca1e33cca04 100644
>> --- a/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
>> +++ b/drivers/net/ethernet/pensando/ionic/ionic_devlink.c
>> @@ -11,8 +11,28 @@
>> static int ionic_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
>> struct netlink_ext_ack *extack)
>> {
>> + struct ionic *ionic = devlink_priv(dl);
>> + struct ionic_dev *idev = &ionic->idev;
>> + char buf[16];
>> +
>> devlink_info_driver_name_put(req, IONIC_DRV_NAME);
>>
>> + devlink_info_version_running_put(req,
>> + DEVLINK_INFO_VERSION_GENERIC_FW_MGMT,
>> + idev->dev_info.fw_version);
> Are you sure this is not the FW that controls the data path?
There is only one FW rev to report, and this covers mgmt and data.
>
>> + snprintf(buf, sizeof(buf), "0x%x", idev->dev_info.asic_type);
>> + devlink_info_version_fixed_put(req,
>> + DEVLINK_INFO_VERSION_GENERIC_BOARD_ID,
>> + buf);
> Board ID is not ASIC. This is for identifying a board version with all
> its components which surround the main ASIC.
>
>> + snprintf(buf, sizeof(buf), "0x%x", idev->dev_info.asic_rev);
>> + devlink_info_version_fixed_put(req,
>> + DEVLINK_INFO_VERSION_GENERIC_BOARD_REV,
>> + buf);
> ditto
Since I don't have any board info available at this point, shall I use
my own "asic.id" and "asic.rev" strings, or in this patch shall I add
something like this to devlink.h and use them here:
/* Part number, identifier of asic design */
#define DEVLINK_INFO_VERSION_GENERIC_ASIC_ID "asic.id"
/* Revision of asic design */
#define DEVLINK_INFO_VERSION_GENERIC_ASIC_REV "asic.rev"
>> + devlink_info_serial_number_put(req, idev->dev_info.serial_num);
>> +
>> return 0;
>> }
>>
>> @@ -41,3 +61,22 @@ void ionic_devlink_free(struct ionic *ionic)
>> {
>> devlink_free(ionic->dl);
>> }
>> +
>> +int ionic_devlink_register(struct ionic *ionic)
>> +{
>> + int err;
>> +
>> + err = devlink_register(ionic->dl, ionic->dev);
>> + if (err)
>> + dev_warn(ionic->dev, "devlink_register failed: %d\n", err);
>> +
>> + return err;
>> +}
>> +
>> +void ionic_devlink_unregister(struct ionic *ionic)
>> +{
>> + if (!ionic || !ionic->dl)
>> + return;
> Impossiblu
Sure.
Thanks,
sln
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