[PATCH 5/9] staging: fsl-dpaa2/eth: Add DPNI version check

[Ioana Radulescu <ruxandra.radulescu@xxxxxxx>]

The DPAA2 Ethernet driver assumes the DPNI objects that it
uses to build network interfaces have a minimum supported
API version, but until now it did nothing to enforce this
requirement.

Add a check at probe time to make sure the DPNI object is
compatible with the set of MC commands we intend to use
on it.

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@xxxxxxx>
---
 drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c     | 15 +++++++++++++++
 drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h     | 10 ++++++++++
 drivers/staging/fsl-dpaa2/ethernet/dpaa2-ethtool.c | 11 ++---------
 3 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
index 9fb88f2..f58c85a 100644
--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
@@ -1846,6 +1846,21 @@ static int setup_dpni(struct fsl_mc_device *ls_dev)
 		return err;
 	}
 
+	/* Check if we can work with this DPNI object */
+	err = dpni_get_api_version(priv->mc_io, 0, &priv->dpni_ver_major,
+				   &priv->dpni_ver_minor);
+	if (err) {
+		dev_err(dev, "dpni_get_api_version() failed\n");
+		goto close;
+	}
+	if (dpaa2_eth_cmp_dpni_ver(priv, DPNI_VER_MAJOR, DPNI_VER_MINOR) < 0) {
+		dev_err(dev, "DPNI version %u.%u not supported, need >= %u.%u\n",
+			priv->dpni_ver_major, priv->dpni_ver_minor,
+			DPNI_VER_MAJOR, DPNI_VER_MINOR);
+		err = -ENOTSUPP;
+		goto close;
+	}
+
 	ls_dev->mc_io = priv->mc_io;
 	ls_dev->mc_handle = priv->mc_token;
 
diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h
index c4816e6..5ac014f 100644
--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h
@@ -311,6 +311,8 @@ struct dpaa2_eth_priv {
 	struct dpaa2_eth_channel *channel[DPAA2_ETH_MAX_DPCONS];
 
 	struct dpni_attr dpni_attrs;
+	u16 dpni_ver_major;
+	u16 dpni_ver_minor;
 	u16 tx_data_offset;
 
 	struct fsl_mc_device *dpbp_dev;
@@ -354,6 +356,14 @@ struct dpaa2_eth_priv {
 extern const struct ethtool_ops dpaa2_ethtool_ops;
 extern const char dpaa2_eth_drv_version[];
 
+static inline int dpaa2_eth_cmp_dpni_ver(struct dpaa2_eth_priv *priv,
+					 u16 ver_major, u16 ver_minor)
+{
+	if (priv->dpni_ver_major == ver_major)
+		return priv->dpni_ver_minor - ver_minor;
+	return priv->dpni_ver_major - ver_major;
+}
+
 /* Hardware only sees DPAA2_ETH_RX_BUF_SIZE, but the skb built around
  * the buffer also needs space for its shared info struct, and we need
  * to allocate enough to accommodate hardware alignment restrictions
diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-ethtool.c b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-ethtool.c
index 070a3f2..dfbfa94 100644
--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-ethtool.c
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-ethtool.c
@@ -78,20 +78,13 @@ static void dpaa2_eth_get_drvinfo(struct net_device *net_dev,
 				  struct ethtool_drvinfo *drvinfo)
 {
 	struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
-	u16 fw_major, fw_minor;
-	int err;
 
 	strlcpy(drvinfo->driver, KBUILD_MODNAME, sizeof(drvinfo->driver));
 	strlcpy(drvinfo->version, dpaa2_eth_drv_version,
 		sizeof(drvinfo->version));
 
-	err =  dpni_get_api_version(priv->mc_io, 0, &fw_major, &fw_minor);
-	if (!err)
-		snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
-			 "%u.%u", fw_major, fw_minor);
-	else
-		strlcpy(drvinfo->fw_version, "N/A",
-			sizeof(drvinfo->fw_version));
+	snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
+		 "%u.%u", priv->dpni_ver_major, priv->dpni_ver_minor);
 
 	strlcpy(drvinfo->bus_info, dev_name(net_dev->dev.parent->parent),
 		sizeof(drvinfo->bus_info));
-- 
2.7.4

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