qlcnic: Take FW dump via ethtool

Driver checks if the previous dump has been cleared before taking the dump.
It doesn't take the dump if it is not cleared.

Changes from v2:
Added lock to protect dump data structures from being mangled while
dumping or setting them via ethtool.
Signed-off-by: Anirban Chakraborty <anirban.chakraborty@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/qlcnic/qlcnic_ethtool.c

@@ -965,6 +965,84 @@ static void qlcnic_set_msglevel(struct net_device *netdev, u32 msglvl)
 	adapter->msg_enable = msglvl;
 }
 
+static int
+qlcnic_get_dump_flag(struct net_device *netdev, struct ethtool_dump *dump)
+{
+	struct qlcnic_adapter *adapter = netdev_priv(netdev);
+	struct qlcnic_fw_dump *fw_dump = &adapter->ahw->fw_dump;
+
+	dump->len = fw_dump->tmpl_hdr->size + fw_dump->size;
+	dump->flag = fw_dump->tmpl_hdr->drv_cap_mask;
+	dump->version = adapter->fw_version;
+	return 0;
+}
+
+static int
+qlcnic_get_dump_data(struct net_device *netdev, struct ethtool_dump *dump,
+			void *buffer)
+{
+	int i, copy_sz;
+	u32 *hdr_ptr, *data;
+	struct qlcnic_adapter *adapter = netdev_priv(netdev);
+	struct qlcnic_fw_dump *fw_dump = &adapter->ahw->fw_dump;
+
+	if (qlcnic_api_lock(adapter))
+		return -EIO;
+	if (!fw_dump->clr) {
+		netdev_info(netdev, "Dump not available\n");
+		qlcnic_api_unlock(adapter);
+		return -EINVAL;
+	}
+	/* Copy template header first */
+	copy_sz = fw_dump->tmpl_hdr->size;
+	hdr_ptr = (u32 *) fw_dump->tmpl_hdr;
+	data = (u32 *) buffer;
+	for (i = 0; i < copy_sz/sizeof(u32); i++)
+		*data++ = cpu_to_le32(*hdr_ptr++);
+
+	/* Copy captured dump data */
+	memcpy(buffer + copy_sz, fw_dump->data, fw_dump->size);
+	dump->len = copy_sz + fw_dump->size;
+	dump->flag = fw_dump->tmpl_hdr->drv_cap_mask;
+
+	/* Free dump area once data has been captured */
+	vfree(fw_dump->data);
+	fw_dump->data = NULL;
+	fw_dump->clr = 0;
+	qlcnic_api_unlock(adapter);
+
+	return 0;
+}
+
+static int
+qlcnic_set_dump(struct net_device *netdev, struct ethtool_dump *val)
+{
+	int ret = 0;
+	struct qlcnic_adapter *adapter = netdev_priv(netdev);
+	struct qlcnic_fw_dump *fw_dump = &adapter->ahw->fw_dump;
+
+	if (val->flag == QLCNIC_FORCE_FW_DUMP_KEY) {
+		netdev_info(netdev, "Forcing a FW dump\n");
+		qlcnic_dev_request_reset(adapter);
+	} else {
+		if (val->flag > QLCNIC_DUMP_MASK_MAX ||
+			val->flag < QLCNIC_DUMP_MASK_MIN) {
+				netdev_info(netdev,
+				"Invalid dump level: 0x%x\n", val->flag);
+				ret = -EINVAL;
+				goto out;
+		}
+		if (qlcnic_api_lock(adapter))
+			return -EIO;
+		fw_dump->tmpl_hdr->drv_cap_mask = val->flag & 0xff;
+		qlcnic_api_unlock(adapter);
+		netdev_info(netdev, "Driver mask changed to: 0x%x\n",
+			fw_dump->tmpl_hdr->drv_cap_mask);
+	}
+out:
+	return ret;
+}
+
 const struct ethtool_ops qlcnic_ethtool_ops = {
 	.get_settings = qlcnic_get_settings,
 	.set_settings = qlcnic_set_settings,
@@ -991,4 +1069,7 @@ const struct ethtool_ops qlcnic_ethtool_ops = {
 	.set_phys_id = qlcnic_set_led,
 	.set_msglevel = qlcnic_set_msglevel,
 	.get_msglevel = qlcnic_get_msglevel,
+	.get_dump_flag = qlcnic_get_dump_flag,
+	.get_dump_data = qlcnic_get_dump_data,
+	.set_dump = qlcnic_set_dump,
 };