be2net: Patch to perform function reset at initialization

This patch is a bug fix to avoid system going into a bad state when
driver is loaded in context of kdump kernel. The patch fixes the issue
by performing a soft reset of pci function at probe time.
Signed-off-by: sarveshwarb <sarveshwarb@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/benet/be_cmds.c

@@ -1019,3 +1019,24 @@ int be_cmd_query_fw_cfg(struct be_adapter *adapter, u32 *port_num)
 	spin_unlock(&adapter->mbox_lock);
 	return status;
 }
+
+int be_cmd_reset_function(struct be_adapter *adapter)
+{
+	struct be_mcc_wrb *wrb = wrb_from_mbox(&adapter->mbox_mem);
+	struct be_cmd_req_hdr *req = embedded_payload(wrb);
+	int status;
+
+	spin_lock(&adapter->mbox_lock);
+
+	memset(wrb, 0, sizeof(*wrb));
+
+	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0);
+
+	be_cmd_hdr_prepare(req, CMD_SUBSYSTEM_COMMON,
+		OPCODE_COMMON_FUNCTION_RESET, sizeof(*req));
+
+	status = be_mbox_notify(adapter);
+
+	spin_unlock(&adapter->mbox_lock);
+	return status;
+}

drivers/net/benet/be_cmds.h

@@ -135,6 +135,7 @@ struct be_mcc_mailbox {
 #define OPCODE_COMMON_QUERY_FIRMWARE_CONFIG		58
 #define OPCODE_COMMON_NTWK_PMAC_ADD			59
 #define OPCODE_COMMON_NTWK_PMAC_DEL			60
+#define OPCODE_COMMON_FUNCTION_RESET			61
 
 #define OPCODE_ETH_ACPI_CONFIG				2
 #define OPCODE_ETH_PROMISCUOUS				3
@@ -744,4 +745,5 @@ extern int be_cmd_set_flow_control(struct be_adapter *adapter,
 extern int be_cmd_get_flow_control(struct be_adapter *adapter,
 			u32 *tx_fc, u32 *rx_fc);
 extern int be_cmd_query_fw_cfg(struct be_adapter *adapter, u32 *port_num);
+extern int be_cmd_reset_function(struct be_adapter *adapter);
 extern void be_process_mcc(struct be_adapter *adapter);

drivers/net/benet/be_main.c

@@ -1873,6 +1873,10 @@ static int __devinit be_probe(struct pci_dev *pdev,
 	if (status)
 		goto free_netdev;
 
+	status = be_cmd_reset_function(adapter);
+	if (status)
+		goto ctrl_clean;
+
 	status = be_stats_init(adapter);
 	if (status)
 		goto ctrl_clean;