target/linux/layerscape/patches-5.4/701-net-0204-dpaa2-eth-Add-Tx-shaping-support.patch

   1 From ef0cc7d01f3eeca37c6bf864903af1c0cf0a792d Mon Sep 17 00:00:00 2001
   2 From: Ioana Radulescu <ruxandra.radulescu@nxp.com>
   3 Date: Fri, 5 May 2017 18:11:08 +0300
   4 Subject: [PATCH] dpaa2-eth: Add Tx shaping support
   5
   6 Add support in sysfs for controlling DPNI Tx shaping
   7 parameters: rate limit (in Mbps) and max burst size (in bytes).
   8 The settings are per port.
   9
  10 TODO: See how to integrate Tx shaping support using
  11 standard Linux tools (ethtool)
  12
  13 Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
  14 Signed-off-by: Bogdan Purcareata <bogdan.purcareata@nxp.com>
  15 ---
  16  drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 80 ++++++++++++++++++++++++
  17  drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h |  4 ++
  18  2 files changed, 84 insertions(+)
  19
  20 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
  21 +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
  22 @@ -3771,6 +3771,83 @@ const struct dcbnl_rtnl_ops dpaa2_eth_dc
  23  };
  24  #endif
  25
  26 +/* SysFS support */
  27 +static ssize_t dpaa2_eth_show_tx_shaping(struct device *dev,
  28 +                                        struct device_attribute *attr,
  29 +                                        char *buf)
  30 +{
  31 +       struct dpaa2_eth_priv *priv = netdev_priv(to_net_dev(dev));
  32 +       /* No MC API for getting the shaping config. We're stateful. */
  33 +       struct dpni_tx_shaping_cfg *scfg = &priv->shaping_cfg;
  34 +
  35 +       return sprintf(buf, "%u %hu\n", scfg->rate_limit, scfg->max_burst_size);
  36 +}
  37 +
  38 +static ssize_t dpaa2_eth_write_tx_shaping(struct device *dev,
  39 +                                         struct device_attribute *attr,
  40 +                                         const char *buf,
  41 +                                         size_t count)
  42 +{
  43 +       int err, items;
  44 +       struct dpaa2_eth_priv *priv = netdev_priv(to_net_dev(dev));
  45 +       struct dpni_tx_shaping_cfg scfg;
  46 +
  47 +       items = sscanf(buf, "%u %hu", &scfg.rate_limit, &scfg.max_burst_size);
  48 +       if (items != 2) {
  49 +               pr_err("Expected format: \"rate_limit(Mbps) max_burst_size(bytes)\"\n");
  50 +               return -EINVAL;
  51 +       }
  52 +       /* Size restriction as per MC API documentation */
  53 +       if (scfg.max_burst_size > DPAA2_ETH_MAX_BURST_SIZE) {
  54 +               pr_err("max_burst_size must be <= %d\n",
  55 +                      DPAA2_ETH_MAX_BURST_SIZE);
  56 +               return -EINVAL;
  57 +       }
  58 +
  59 +       err = dpni_set_tx_shaping(priv->mc_io, 0, priv->mc_token, &scfg);
  60 +       if (err) {
  61 +               dev_err(dev, "dpni_set_tx_shaping() failed\n");
  62 +               return -EPERM;
  63 +       }
  64 +       /* If successful, save the current configuration for future inquiries */
  65 +       priv->shaping_cfg = scfg;
  66 +
  67 +       return count;
  68 +}
  69 +
  70 +static struct device_attribute dpaa2_eth_attrs[] = {
  71 +       __ATTR(tx_shaping,
  72 +              0600,
  73 +              dpaa2_eth_show_tx_shaping,
  74 +              dpaa2_eth_write_tx_shaping),
  75 +};
  76 +
  77 +static void dpaa2_eth_sysfs_init(struct device *dev)
  78 +{
  79 +       int i, err;
  80 +
  81 +       for (i = 0; i < ARRAY_SIZE(dpaa2_eth_attrs); i++) {
  82 +               err = device_create_file(dev, &dpaa2_eth_attrs[i]);
  83 +               if (err) {
  84 +                       dev_err(dev, "ERROR creating sysfs file\n");
  85 +                       goto undo;
  86 +               }
  87 +       }
  88 +       return;
  89 +
  90 +undo:
  91 +       while (i > 0)
  92 +               device_remove_file(dev, &dpaa2_eth_attrs[--i]);
  93 +}
  94 +
  95 +static void dpaa2_eth_sysfs_remove(struct device *dev)
  96 +{
  97 +       int i;
  98 +
  99 +       for (i = 0; i < ARRAY_SIZE(dpaa2_eth_attrs); i++)
 100 +               device_remove_file(dev, &dpaa2_eth_attrs[i]);
 101 +}
 102 +
 103  static int dpaa2_eth_probe(struct fsl_mc_device *dpni_dev)
 104  {
 105         struct device *dev;
 106 @@ -3890,6 +3967,7 @@ static int dpaa2_eth_probe(struct fsl_mc
 107  #ifdef CONFIG_DEBUG_FS
 108         dpaa2_dbg_add(priv);
 109  #endif
 110 +       dpaa2_eth_sysfs_init(&net_dev->dev);
 111
 112         dev_info(dev, "Probed interface %s\n", net_dev->name);
 113         return 0;
 114 @@ -3937,6 +4015,8 @@ static int dpaa2_eth_remove(struct fsl_m
 115  #ifdef CONFIG_DEBUG_FS
 116         dpaa2_dbg_remove(priv);
 117  #endif
 118 +       dpaa2_eth_sysfs_remove(&net_dev->dev);
 119 +
 120         unregister_netdev(net_dev);
 121
 122         if (priv->do_link_poll)
 123 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
 124 +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
 125 @@ -42,6 +42,9 @@
 126   */
 127  #define DPAA2_ETH_FQ_TAILDROP_THRESH   (1024 * 1024)
 128
 129 +/* Maximum burst size value for Tx shaping */
 130 +#define DPAA2_ETH_MAX_BURST_SIZE       0xF7FF
 131 +
 132  /* Maximum number of Tx confirmation frames to be processed
 133   * in a single NAPI call
 134   */
 135 @@ -444,6 +447,7 @@ struct dpaa2_eth_priv {
 136  #ifdef CONFIG_DEBUG_FS
 137         struct dpaa2_debugfs dbg;
 138  #endif
 139 +       struct dpni_tx_shaping_cfg shaping_cfg;
 140  };
 141
 142  #define DPAA2_RXH_SUPPORTED    (RXH_L2DA | RXH_VLAN | RXH_L3_PROTO \