target/linux/layerscape/patches-5.4/701-net-0401-fsl_qbman-Framework-for-enabling-Link-status-notific.patch

   1 From 136d46d2fa27815cc4cc3a57d5e3d54523028768 Mon Sep 17 00:00:00 2001
   2 From: Sachin Saxena <sachin.saxena@nxp.com>
   3 Date: Thu, 19 Dec 2019 12:57:35 +0530
   4 Subject: [PATCH] fsl_qbman: Framework for enabling Link status notification
   5
   6  -  This will enable link update event notification for
   7     user space USDPAA application.
   8
   9 Signed-off-by: Sachin Saxena <sachin.saxena@nxp.com>
  10 DPDK-2128
  11 (cherry picked from commit fb53c813a779cc3fc28c8ed3fc8bc0dde24db0ea)
  12 ---
  13  drivers/staging/fsl_qbman/Makefile     |   4 +
  14  drivers/staging/fsl_qbman/fsl_usdpaa.c | 278 ++++++++++++++++++++++++++++++++-
  15  include/linux/fsl_usdpaa.h             |  32 ++++
  16  3 files changed, 313 insertions(+), 1 deletion(-)
  17
  18 --- a/drivers/staging/fsl_qbman/Makefile
  19 +++ b/drivers/staging/fsl_qbman/Makefile
  20 @@ -1,5 +1,9 @@
  21  subdir-ccflags-y := -Werror
  22
  23 +# Include netcomm SW specific definitions
  24 +include $(srctree)/drivers/net/ethernet/freescale/sdk_fman/ncsw_config.mk
  25 +ccflags-y += -I$(NET_DPA)
  26 +
  27  # Common
  28  obj-$(CONFIG_FSL_SDK_DPA)              += dpa_alloc.o
  29  obj-$(CONFIG_FSL_SDK_DPA)      += qbman_driver.o
  30 --- a/drivers/staging/fsl_qbman/fsl_usdpaa.c
  31 +++ b/drivers/staging/fsl_qbman/fsl_usdpaa.c
  32 @@ -18,6 +18,8 @@
  33  #include <linux/slab.h>
  34  #include <linux/mman.h>
  35  #include <linux/of_reserved_mem.h>
  36 +#include <linux/eventfd.h>
  37 +#include <linux/fdtable.h>
  38
  39  #if !(defined(CONFIG_ARM) || defined(CONFIG_ARM64))
  40  #include <mm/mmu_decl.h>
  41 @@ -27,6 +29,26 @@
  42  #include <linux/fsl_usdpaa.h>
  43  #include "bman_low.h"
  44  #include "qman_low.h"
  45 +/* Headers requires for
  46 + * Link status support
  47 + */
  48 +#include <linux/device.h>
  49 +#include <linux/of_mdio.h>
  50 +#include "mac.h"
  51 +#include "dpaa_eth_common.h"
  52 +
  53 +/* Private data for Proxy Interface */
  54 +struct dpa_proxy_priv_s {
  55 +       struct mac_device       *mac_dev;
  56 +       struct eventfd_ctx      *efd_ctx;
  57 +};
  58 +/* Interface Helpers */
  59 +static inline struct device *get_dev_ptr(char *if_name);
  60 +static void phy_link_updates(struct net_device *net_dev);
  61 +/* IOCTL handlers */
  62 +static inline int ioctl_usdpaa_get_link_status(char *if_name);
  63 +static int ioctl_en_if_link_status(struct usdpaa_ioctl_link_status *args);
  64 +static int ioctl_disable_if_link_status(char *if_name);
  65
  66  /* Physical address range of the memory reservation, exported for mm/mem.c */
  67  static u64 phys_start;
  68 @@ -556,7 +578,6 @@ static bool check_portal_channel(void *c
  69
  70
  71
  72 -
  73  static int usdpaa_release(struct inode *inode, struct file *filp)
  74  {
  75         int err = 0;
  76 @@ -1656,6 +1677,220 @@ found:
  77         return 0;
  78  }
  79
  80 +
  81 +static inline struct device *get_dev_ptr(char *if_name)
  82 +{
  83 +       struct device *dev;
  84 +       char node[NODE_NAME_LEN];
  85 +
  86 +       sprintf(node, "soc:fsl,dpaa:%s",if_name);
  87 +       dev = bus_find_device_by_name(&platform_bus_type, NULL, node);
  88 +       if (dev == NULL) {
  89 +               pr_err(KBUILD_MODNAME "IF %s not found\n", if_name);
  90 +               return NULL;
  91 +       }
  92 +       pr_debug("%s: found dev 0x%lX  for If %s ,dev->platform_data %p\n",
  93 +                         __func__, (unsigned long)dev,
  94 +                         if_name, dev->platform_data);
  95 +
  96 +       return dev;
  97 +}
  98 +
  99 +/* This function will return Current link status of the device
 100 + * '1' if Link is UP, '0' otherwise.
 101 + *
 102 + * Input parameter:
 103 + * if_name: Interface node name
 104 + *
 105 + */
 106 +static inline int ioctl_usdpaa_get_link_status(char *if_name)
 107 +{
 108 +       struct net_device *net_dev = NULL;
 109 +       struct device *dev;
 110 +
 111 +       dev = get_dev_ptr(if_name);
 112 +       if (dev == NULL)
 113 +               return -ENODEV;
 114 +       net_dev = dev->platform_data;
 115 +       if (net_dev == NULL)
 116 +               return -ENODEV;
 117 +
 118 +       if (test_bit(__LINK_STATE_NOCARRIER, &net_dev->state))
 119 +               return 0; /* Link is DOWN */
 120 +       else
 121 +               return 1; /* Link is UP */
 122 +}
 123 +
 124 +
 125 +/* Link Status Callback Function
 126 + * This function will be resgitered to PHY framework to get
 127 + * Link update notifications and should be responsible for waking up
 128 + * user space task when there is a link update notification.
 129 + */
 130 +static void phy_link_updates(struct net_device *net_dev)
 131 +{
 132 +       struct dpa_proxy_priv_s *priv = NULL;
 133 +
 134 +       pr_debug("%s: Link '%s': Speed '%d-Mbps': Autoneg '%d': Duplex '%d'\n",
 135 +               net_dev->name,
 136 +               ioctl_usdpaa_get_link_status(net_dev->name)?"UP":"DOWN",
 137 +               net_dev->phydev->speed,
 138 +               net_dev->phydev->autoneg,
 139 +               net_dev->phydev->duplex);
 140 +
 141 +       /* Wake up the user space context to notify PHY update */
 142 +       priv = netdev_priv(net_dev);
 143 +       eventfd_signal(priv->efd_ctx, 1);
 144 +}
 145 +
 146 +
 147 +/* IOCTL handler for enabling Link status request for a given interface
 148 + * Input parameters:
 149 + * args->if_name:      This the network interface node name as defind in
 150 + *                     device tree file. Currently, it has format of
 151 + *                     "ethernet@x" type for each interface.
 152 + * args->efd:          The eventfd value which should be waked up when
 153 + *                     there is any link update received.
 154 + */
 155 +static int ioctl_en_if_link_status(struct usdpaa_ioctl_link_status *args)
 156 +{
 157 +       struct net_device *net_dev = NULL;
 158 +       struct dpa_proxy_priv_s *priv = NULL;
 159 +       struct device *dev;
 160 +       struct mac_device *mac_dev;
 161 +       struct proxy_device *proxy_dev;
 162 +       struct task_struct *userspace_task = NULL;
 163 +       struct file *efd_file = NULL;
 164 +
 165 +       dev = get_dev_ptr(args->if_name);
 166 +       if (dev == NULL)
 167 +               return -ENODEV;
 168 +       /* Utilize dev->platform_data to save netdevice
 169 +          pointer as it will not be registered */
 170 +       if (dev->platform_data) {
 171 +               pr_debug("%s: IF %s already initialized\n",
 172 +                       __func__, args->if_name);
 173 +               /* This will happen when application is not able to initiate
 174 +                * cleanup in last run. We still need to save the new
 175 +                * eventfd context.
 176 +                */
 177 +               net_dev = dev->platform_data;
 178 +               priv = netdev_priv(net_dev);
 179 +
 180 +               /* Get current task context from which IOCTL was called */
 181 +               userspace_task = current;
 182 +
 183 +               rcu_read_lock();
 184 +               efd_file = fcheck_files(userspace_task->files, args->efd);
 185 +               rcu_read_unlock();
 186 +
 187 +               priv->efd_ctx = eventfd_ctx_fileget(efd_file);
 188 +               if (!priv->efd_ctx) {
 189 +                       pr_err(KBUILD_MODNAME "get eventfd context failed\n");
 190 +                       /* Free the allocated memory for net device */
 191 +                       dev->platform_data = NULL;
 192 +                       free_netdev(net_dev);
 193 +                       return -EINVAL;
 194 +               }
 195 +               /* Since there will be NO PHY update as link is already setup,
 196 +                * wake user context once so that current PHY status can
 197 +                * be fetched.
 198 +                */
 199 +               phy_link_updates(net_dev);
 200 +               return 0;
 201 +       }
 202 +
 203 +       proxy_dev = dev_get_drvdata(dev);
 204 +       mac_dev =  proxy_dev->mac_dev;
 205 +       /* Allocate an dummy net device for proxy interface */
 206 +       net_dev = alloc_etherdev(sizeof(*priv));
 207 +       if (!net_dev) {
 208 +               pr_err(KBUILD_MODNAME "alloc_etherdev failed\n");
 209 +               return -ENOMEM;
 210 +       } else {
 211 +               SET_NETDEV_DEV(net_dev, dev);
 212 +               priv = netdev_priv(net_dev);
 213 +               priv->mac_dev = mac_dev;
 214 +               /* Get current task context from which IOCTL was called */
 215 +               userspace_task = current;
 216 +
 217 +               rcu_read_lock();
 218 +               efd_file = fcheck_files(userspace_task->files, args->efd);
 219 +               rcu_read_unlock();
 220 +
 221 +               priv->efd_ctx = eventfd_ctx_fileget(efd_file);
 222 +
 223 +               if (!priv->efd_ctx) {
 224 +                       pr_err(KBUILD_MODNAME "get eventfd context failed\n");
 225 +                       /* Free the allocated memory for net device */
 226 +                       free_netdev(net_dev);
 227 +                       return -EINVAL;
 228 +               }
 229 +               strncpy(net_dev->name, args->if_name, IF_NAME_MAX_LEN);
 230 +               dev->platform_data = net_dev;
 231 +       }
 232 +
 233 +       pr_debug("%s: mac_dev %p cell_index %d\n",
 234 +               __func__, mac_dev, mac_dev->cell_index);
 235 +       mac_dev->phy_dev = of_phy_connect(net_dev, mac_dev->phy_node,
 236 +                                phy_link_updates, 0, mac_dev->phy_if);
 237 +       if (unlikely(mac_dev->phy_dev == NULL) || IS_ERR(mac_dev->phy_dev)) {
 238 +               pr_err("%s: --------Error in PHY Connect\n", __func__);
 239 +               /* Free the allocated memory for net device */
 240 +               free_netdev(net_dev);
 241 +               return -ENODEV;
 242 +       }
 243 +       net_dev->phydev = mac_dev->phy_dev;
 244 +       mac_dev->start(mac_dev);
 245 +       pr_debug("%s: --- PHY connected for %s\n", __func__, args->if_name);
 246 +
 247 +       return 0;
 248 +}
 249 +
 250 +/* IOCTL handler for disabling Link status for a given interface
 251 + * Input parameters:
 252 + * if_name:    This the network interface node name as defind in
 253 + *             device tree file. Currently, it has format of
 254 + *             "ethernet@x" type for each interface.
 255 + */
 256 +static int ioctl_disable_if_link_status(char *if_name)
 257 +{
 258 +       struct net_device *net_dev = NULL;
 259 +       struct device *dev;
 260 +       struct mac_device *mac_dev;
 261 +       struct proxy_device *proxy_dev;
 262 +       struct dpa_proxy_priv_s *priv = NULL;
 263 +
 264 +       dev = get_dev_ptr(if_name);
 265 +       if (dev == NULL)
 266 +               return -ENODEV;
 267 +       /* Utilize dev->platform_data to save netdevice
 268 +          pointer as it will not be registered */
 269 +       if (!dev->platform_data) {
 270 +               pr_debug("%s: IF %s already Disabled for Link status\n",
 271 +                       __func__, if_name);
 272 +               return 0;
 273 +       }
 274 +
 275 +       net_dev = dev->platform_data;
 276 +       proxy_dev = dev_get_drvdata(dev);
 277 +       mac_dev =  proxy_dev->mac_dev;
 278 +       mac_dev->stop(mac_dev);
 279 +
 280 +       priv = netdev_priv(net_dev);
 281 +       eventfd_ctx_put(priv->efd_ctx);
 282 +
 283 +       /* This will also deregister the call back */
 284 +       phy_disconnect(mac_dev->phy_dev);
 285 +       phy_resume(mac_dev->phy_dev);
 286 +
 287 +       free_netdev(net_dev);
 288 +       dev->platform_data = NULL;
 289 +
 290 +       pr_debug("%s: Link status Disabled for %s\n", __func__, if_name);
 291 +       return 0;
 292 +}
 293 +
 294  static long usdpaa_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
 295  {
 296         struct ctx *ctx = fp->private_data;
 297 @@ -1722,6 +1957,47 @@ static long usdpaa_ioctl(struct file *fp
 298                         return -EFAULT;
 299                 return ioctl_free_raw_portal(fp, ctx, &input);
 300         }
 301 +       case USDPAA_IOCTL_ENABLE_LINK_STATUS_INTERRUPT:
 302 +       {
 303 +               struct usdpaa_ioctl_link_status input;
 304 +               int ret;
 305 +
 306 +               if (copy_from_user(&input, a, sizeof(input)))
 307 +                       return -EFAULT;
 308 +               ret = ioctl_en_if_link_status(&input);
 309 +               if (ret)
 310 +                       pr_err("Error(%d) enable link interrupt:IF: %s\n",
 311 +                               ret, input.if_name);
 312 +               return ret;
 313 +       }
 314 +       case USDPAA_IOCTL_DISABLE_LINK_STATUS_INTERRUPT:
 315 +       {
 316 +               char *input;
 317 +               int ret;
 318 +
 319 +               if (copy_from_user(&input, a, sizeof(input)))
 320 +                       return -EFAULT;
 321 +               ret = ioctl_disable_if_link_status(input);
 322 +               if (ret)
 323 +                       pr_err("Error(%d) Disabling link interrupt:IF: %s\n",
 324 +                               ret, input);
 325 +               return ret;
 326 +       }
 327 +       case USDPAA_IOCTL_GET_LINK_STATUS:
 328 +       {
 329 +               struct usdpaa_ioctl_link_status_args input;
 330 +
 331 +               if (copy_from_user(&input, a, sizeof(input)))
 332 +                       return -EFAULT;
 333 +
 334 +               input.link_status = ioctl_usdpaa_get_link_status(input.if_name);
 335 +               if (input.link_status < 0)
 336 +                       return input.link_status;
 337 +               if (copy_to_user(a, &input, sizeof(input)))
 338 +                       return -EFAULT;
 339 +
 340 +               return 0;
 341 +       }
 342         }
 343         return -EINVAL;
 344  }
 345 --- a/include/linux/fsl_usdpaa.h
 346 +++ b/include/linux/fsl_usdpaa.h
 347 @@ -365,6 +365,38 @@ int dpa_alloc_pop(struct dpa_alloc *allo
 348  int dpa_alloc_check(struct dpa_alloc *list, u32 id);
 349  #endif /* __KERNEL__ */
 350
 351 +
 352 +/************************************
 353 + * Link Status support for user space
 354 + * interface
 355 + ************************************/
 356 +#define IF_NAME_MAX_LEN 16
 357 +#define NODE_NAME_LEN  32
 358 +
 359 +struct usdpaa_ioctl_link_status {
 360 +       /* network device node name */
 361 +       char            if_name[IF_NAME_MAX_LEN];
 362 +       /* Eventfd value */
 363 +       uint32_t        efd;
 364 +};
 365 +
 366 +#define USDPAA_IOCTL_ENABLE_LINK_STATUS_INTERRUPT \
 367 +       _IOW(USDPAA_IOCTL_MAGIC, 0x0E, struct usdpaa_ioctl_link_status)
 368 +
 369 +#define USDPAA_IOCTL_DISABLE_LINK_STATUS_INTERRUPT \
 370 +       _IOW(USDPAA_IOCTL_MAGIC, 0x0F, char *)
 371 +
 372 +struct usdpaa_ioctl_link_status_args {
 373 +       /* network device node name */
 374 +       char    if_name[IF_NAME_MAX_LEN];
 375 +       /* link status(UP/DOWN) */
 376 +       int     link_status;
 377 +};
 378 +
 379 +#define USDPAA_IOCTL_GET_LINK_STATUS \
 380 +       _IOWR(USDPAA_IOCTL_MAGIC, 0x10, struct usdpaa_ioctl_link_status_args)
 381 +
 382 +
 383  #ifdef __cplusplus
 384  }
 385  #endif