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From ef0cc7d01f3eeca37c6bf864903af1c0cf0a792d Mon Sep 17 00:00:00 2001
From: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Date: Fri, 5 May 2017 18:11:08 +0300
Subject: [PATCH] dpaa2-eth: Add Tx shaping support
Add support in sysfs for controlling DPNI Tx shaping
parameters: rate limit (in Mbps) and max burst size (in bytes).
The settings are per port.
TODO: See how to integrate Tx shaping support using
standard Linux tools (ethtool)
Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: Bogdan Purcareata <bogdan.purcareata@nxp.com>
---
drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 80 ++++++++++++++++++++++++
drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h | 4 ++
2 files changed, 84 insertions(+)
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -3771,6 +3771,83 @@ const struct dcbnl_rtnl_ops dpaa2_eth_dc
};
#endif
+/* SysFS support */
+static ssize_t dpaa2_eth_show_tx_shaping(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct dpaa2_eth_priv *priv = netdev_priv(to_net_dev(dev));
+ /* No MC API for getting the shaping config. We're stateful. */
+ struct dpni_tx_shaping_cfg *scfg = &priv->shaping_cfg;
+
+ return sprintf(buf, "%u %hu\n", scfg->rate_limit, scfg->max_burst_size);
+}
+
+static ssize_t dpaa2_eth_write_tx_shaping(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ int err, items;
+ struct dpaa2_eth_priv *priv = netdev_priv(to_net_dev(dev));
+ struct dpni_tx_shaping_cfg scfg;
+
+ items = sscanf(buf, "%u %hu", &scfg.rate_limit, &scfg.max_burst_size);
+ if (items != 2) {
+ pr_err("Expected format: \"rate_limit(Mbps) max_burst_size(bytes)\"\n");
+ return -EINVAL;
+ }
+ /* Size restriction as per MC API documentation */
+ if (scfg.max_burst_size > DPAA2_ETH_MAX_BURST_SIZE) {
+ pr_err("max_burst_size must be <= %d\n",
+ DPAA2_ETH_MAX_BURST_SIZE);
+ return -EINVAL;
+ }
+
+ err = dpni_set_tx_shaping(priv->mc_io, 0, priv->mc_token, &scfg);
+ if (err) {
+ dev_err(dev, "dpni_set_tx_shaping() failed\n");
+ return -EPERM;
+ }
+ /* If successful, save the current configuration for future inquiries */
+ priv->shaping_cfg = scfg;
+
+ return count;
+}
+
+static struct device_attribute dpaa2_eth_attrs[] = {
+ __ATTR(tx_shaping,
+ 0600,
+ dpaa2_eth_show_tx_shaping,
+ dpaa2_eth_write_tx_shaping),
+};
+
+static void dpaa2_eth_sysfs_init(struct device *dev)
+{
+ int i, err;
+
+ for (i = 0; i < ARRAY_SIZE(dpaa2_eth_attrs); i++) {
+ err = device_create_file(dev, &dpaa2_eth_attrs[i]);
+ if (err) {
+ dev_err(dev, "ERROR creating sysfs file\n");
+ goto undo;
+ }
+ }
+ return;
+
+undo:
+ while (i > 0)
+ device_remove_file(dev, &dpaa2_eth_attrs[--i]);
+}
+
+static void dpaa2_eth_sysfs_remove(struct device *dev)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(dpaa2_eth_attrs); i++)
+ device_remove_file(dev, &dpaa2_eth_attrs[i]);
+}
+
static int dpaa2_eth_probe(struct fsl_mc_device *dpni_dev)
{
struct device *dev;
@@ -3890,6 +3967,7 @@ static int dpaa2_eth_probe(struct fsl_mc
#ifdef CONFIG_DEBUG_FS
dpaa2_dbg_add(priv);
#endif
+ dpaa2_eth_sysfs_init(&net_dev->dev);
dev_info(dev, "Probed interface %s\n", net_dev->name);
return 0;
@@ -3937,6 +4015,8 @@ static int dpaa2_eth_remove(struct fsl_m
#ifdef CONFIG_DEBUG_FS
dpaa2_dbg_remove(priv);
#endif
+ dpaa2_eth_sysfs_remove(&net_dev->dev);
+
unregister_netdev(net_dev);
if (priv->do_link_poll)
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
@@ -42,6 +42,9 @@
*/
#define DPAA2_ETH_FQ_TAILDROP_THRESH (1024 * 1024)
+/* Maximum burst size value for Tx shaping */
+#define DPAA2_ETH_MAX_BURST_SIZE 0xF7FF
+
/* Maximum number of Tx confirmation frames to be processed
* in a single NAPI call
*/
@@ -444,6 +447,7 @@ struct dpaa2_eth_priv {
#ifdef CONFIG_DEBUG_FS
struct dpaa2_debugfs dbg;
#endif
+ struct dpni_tx_shaping_cfg shaping_cfg;
};
#define DPAA2_RXH_SUPPORTED (RXH_L2DA | RXH_VLAN | RXH_L3_PROTO \
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