qed*: Fix size of config attribute dump.

Driver currently returns max-buf-size as size of the config attribute.
This patch incorporates changes to read this value from MFW (if available)
and provide it to the user. Also did a trivial clean up in this path.

Fixes: d44a3ced ("qede: Add support for reading the config id attributes.")
Signed-off-by: Sudarsana Reddy Kalluru <skalluru@marvell.com>
Signed-off-by: Ariel Elior <aelior@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qed/qed_main.c

@@ -2300,6 +2300,31 @@ static int qed_nvm_flash_cfg_write(struct qed_dev *cdev, const u8 **data)
 	return rc;
 }
 
+#define QED_MAX_NVM_BUF_LEN	32
+static int qed_nvm_flash_cfg_len(struct qed_dev *cdev, u32 cmd)
+{
+	struct qed_hwfn *hwfn = QED_LEADING_HWFN(cdev);
+	u8 buf[QED_MAX_NVM_BUF_LEN];
+	struct qed_ptt *ptt;
+	u32 len;
+	int rc;
+
+	ptt = qed_ptt_acquire(hwfn);
+	if (!ptt)
+		return QED_MAX_NVM_BUF_LEN;
+
+	rc = qed_mcp_nvm_get_cfg(hwfn, ptt, cmd, 0, QED_NVM_CFG_GET_FLAGS, buf,
+				 &len);
+	if (rc || !len) {
+		DP_ERR(cdev, "Error %d reading %d\n", rc, cmd);
+		len = QED_MAX_NVM_BUF_LEN;
+	}
+
+	qed_ptt_release(hwfn, ptt);
+
+	return len;
+}
+
 static int qed_nvm_flash_cfg_read(struct qed_dev *cdev, u8 **data,
 				  u32 cmd, u32 entity_id)
 {
@@ -2657,6 +2682,7 @@ const struct qed_common_ops qed_common_ops_pass = {
 	.read_module_eeprom = &qed_read_module_eeprom,
 	.get_affin_hwfn_idx = &qed_get_affin_hwfn_idx,
 	.read_nvm_cfg = &qed_nvm_flash_cfg_read,
+	.read_nvm_cfg_len = &qed_nvm_flash_cfg_len,
 	.set_grc_config = &qed_set_grc_config,
 };
 

drivers/net/ethernet/qlogic/qede/qede_ethtool.c

@@ -49,7 +49,6 @@
 
 #define QEDE_SELFTEST_POLL_COUNT 100
 #define QEDE_DUMP_VERSION	0x1
-#define QEDE_DUMP_NVM_BUF_LEN	32
 #define QEDE_DUMP_NVM_ARG_COUNT	2
 
 static const struct {
@@ -2026,7 +2025,8 @@ static int qede_get_dump_flag(struct net_device *dev,
 	switch (edev->dump_info.cmd) {
 	case QEDE_DUMP_CMD_NVM_CFG:
 		dump->flag = QEDE_DUMP_CMD_NVM_CFG;
-		dump->len = QEDE_DUMP_NVM_BUF_LEN;
+		dump->len = edev->ops->common->read_nvm_cfg_len(edev->cdev,
+						edev->dump_info.args[0]);
 		break;
 	case QEDE_DUMP_CMD_GRCDUMP:
 		dump->flag = QEDE_DUMP_CMD_GRCDUMP;
@@ -2051,9 +2051,8 @@ static int qede_get_dump_data(struct net_device *dev,
 
 	if (!edev->ops || !edev->ops->common) {
 		DP_ERR(edev, "Edev ops not populated\n");
-		edev->dump_info.cmd = QEDE_DUMP_CMD_NONE;
-		edev->dump_info.num_args = 0;
-		return -EINVAL;
+		rc = -EINVAL;
+		goto err;
 	}
 
 	switch (edev->dump_info.cmd) {
@@ -2062,7 +2061,8 @@ static int qede_get_dump_data(struct net_device *dev,
 			DP_ERR(edev, "Arg count = %d required = %d\n",
 			       edev->dump_info.num_args,
 			       QEDE_DUMP_NVM_ARG_COUNT);
-			return -EINVAL;
+			rc = -EINVAL;
+			goto err;
 		}
 		rc =  edev->ops->common->read_nvm_cfg(edev->cdev, (u8 **)&buf,
 						      edev->dump_info.args[0],
@@ -2078,8 +2078,10 @@ static int qede_get_dump_data(struct net_device *dev,
 		break;
 	}
 
+err:
 	edev->dump_info.cmd = QEDE_DUMP_CMD_NONE;
 	edev->dump_info.num_args = 0;
+	memset(edev->dump_info.args, 0, sizeof(edev->dump_info.args));
 
 	return rc;
 }

include/linux/qed/qed_if.h

@@ -1143,6 +1143,14 @@ struct qed_common_ops {
  */
 	int (*read_nvm_cfg)(struct qed_dev *cdev, u8 **buf, u32 cmd,
 			    u32 entity_id);
+/**
+ * @brief read_nvm_cfg - Read NVM config attribute value.
+ * @param cdev
+ * @param cmd - NVM CFG command id
+ *
+ * @return config id length, 0 on error.
+ */
+	int (*read_nvm_cfg_len)(struct qed_dev *cdev, u32 cmd);
 
 /**
  * @brief set_grc_config - Configure value for grc config id.