netxen: firmware hang detection

Implement state machine to detect firmware hung state
and recover. Since firmware will be shared by all PCI
functions that have different class drivers (NIC or
FCOE or iSCSI), explicit hardware based serialization
is required for initializing firmware.

o Used global scratchpad register to maintain device
  reference count. Every probed pci function adds to
  ref count.

o Implement timer (delayed work) for each pci func
  that checks firmware heartbit every 5 sec and detaches
  itself if firmware is dead. Last detaching function
  reloads firmware. Other functions wait for firmware
  init, and re-attach themselves.

Heartbit is not supported by NX2031 firmware.

Signed-off-by: Amit Kumar Salecha <amit@netxen.com>
Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/netxen/netxen_nic_ctx.c b/drivers/net/netxen/netxen_nic_ctx.c
index 0f42ab998368..8ab5773e47d6 100644
--- a/drivers/net/netxen/netxen_nic_ctx.c
+++ b/drivers/net/netxen/netxen_nic_ctx.c
@@ -678,6 +678,9 @@ int netxen_alloc_hw_resources(struct netxen_adapter *adapter)
 
 
         if (!NX_IS_REVISION_P2(adapter->ahw.revision_id)) {
+                if (test_and_set_bit(__NX_FW_ATTACHED, &adapter->state))
+                        goto done;
+
                 err = nx_fw_cmd_create_rx_ctx(adapter);
                 if (err)
                         goto err_out_free;
@@ -690,6 +693,7 @@ int netxen_alloc_hw_resources(struct netxen_adapter *adapter)
                         goto err_out_free;
         }
 
+done:
         return 0;
 
 err_out_free:
@@ -708,6 +712,9 @@ void netxen_free_hw_resources(struct netxen_adapter *adapter)
         int port = adapter->portnum;
 
         if (!NX_IS_REVISION_P2(adapter->ahw.revision_id)) {
+                if (!test_and_clear_bit(__NX_FW_ATTACHED, &adapter->state))
+                        goto done;
+
                 nx_fw_cmd_destroy_rx_ctx(adapter);
                 nx_fw_cmd_destroy_tx_ctx(adapter);
         } else {
@@ -720,6 +727,7 @@ void netxen_free_hw_resources(struct netxen_adapter *adapter)
         /* Allow dma queues to drain after context reset */
         msleep(20);
 
+done:
         recv_ctx = &adapter->recv_ctx;
 
         if (recv_ctx->hwctx != NULL) {