i40e: Implementation of ERROR state for NVM update state machine

This patch adds I40E_NVMUPD_STATE_ERROR state for NVM update.
Without this patch driver has no possibility to return NVM image write
failure.This state is being set when ARQ rises error.
arq_last_status is also updated every time when ARQ event comes,
not only on error cases.

Change-ID: I67ce43ba22a240773c2821b436e96054db0b7c81
Signed-off-by: Maciej Sosin <maciej.sosin@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_adminq.c

@@ -964,11 +964,11 @@ i40e_status i40e_clean_arq_element(struct i40e_hw *hw,
 	desc = I40E_ADMINQ_DESC(hw->aq.arq, ntc);
 	desc_idx = ntc;
 
+	hw->aq.arq_last_status =
+		(enum i40e_admin_queue_err)le16_to_cpu(desc->retval);
 	flags = le16_to_cpu(desc->flags);
 	if (flags & I40E_AQ_FLAG_ERR) {
 		ret_code = I40E_ERR_ADMIN_QUEUE_ERROR;
-		hw->aq.arq_last_status =
-			(enum i40e_admin_queue_err)le16_to_cpu(desc->retval);
 		i40e_debug(hw,
 			   I40E_DEBUG_AQ_MESSAGE,
 			   "AQRX: Event received with error 0x%X.\n",

drivers/net/ethernet/intel/i40e/i40e_nvm.c

@@ -722,9 +722,20 @@ i40e_status i40e_nvmupd_command(struct i40e_hw *hw,
 			*((u16 *)&bytes[2]) = hw->nvm_wait_opcode;
 		}
 
+		/* Clear error status on read */
+		if (hw->nvmupd_state == I40E_NVMUPD_STATE_ERROR)
+			hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
+
 		return 0;
 	}
 
+	/* Clear status even it is not read and log */
+	if (hw->nvmupd_state == I40E_NVMUPD_STATE_ERROR) {
+		i40e_debug(hw, I40E_DEBUG_NVM,
+			   "Clearing I40E_NVMUPD_STATE_ERROR state without reading\n");
+		hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
+	}
+
 	switch (hw->nvmupd_state) {
 	case I40E_NVMUPD_STATE_INIT:
 		status = i40e_nvmupd_state_init(hw, cmd, bytes, perrno);
@@ -1074,6 +1085,11 @@ void i40e_nvmupd_check_wait_event(struct i40e_hw *hw, u16 opcode)
 		}
 		hw->nvm_wait_opcode = 0;
 
+		if (hw->aq.arq_last_status) {
+			hw->nvmupd_state = I40E_NVMUPD_STATE_ERROR;
+			return;
+		}
+
 		switch (hw->nvmupd_state) {
 		case I40E_NVMUPD_STATE_INIT_WAIT:
 			hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;

drivers/net/ethernet/intel/i40e/i40e_type.h

@@ -366,6 +366,7 @@ enum i40e_nvmupd_state {
 	I40E_NVMUPD_STATE_WRITING,
 	I40E_NVMUPD_STATE_INIT_WAIT,
 	I40E_NVMUPD_STATE_WRITE_WAIT,
+	I40E_NVMUPD_STATE_ERROR
 };
 
 /* nvm_access definition and its masks/shifts need to be accessible to

drivers/net/ethernet/intel/i40evf/i40e_adminq.c

@@ -912,11 +912,11 @@ i40e_status i40evf_clean_arq_element(struct i40e_hw *hw,
 	desc = I40E_ADMINQ_DESC(hw->aq.arq, ntc);
 	desc_idx = ntc;
 
+	hw->aq.arq_last_status =
+		(enum i40e_admin_queue_err)le16_to_cpu(desc->retval);
 	flags = le16_to_cpu(desc->flags);
 	if (flags & I40E_AQ_FLAG_ERR) {
 		ret_code = I40E_ERR_ADMIN_QUEUE_ERROR;
-		hw->aq.arq_last_status =
-			(enum i40e_admin_queue_err)le16_to_cpu(desc->retval);
 		i40e_debug(hw,
 			   I40E_DEBUG_AQ_MESSAGE,
 			   "AQRX: Event received with error 0x%X.\n",

drivers/net/ethernet/intel/i40evf/i40e_type.h

@@ -348,6 +348,7 @@ enum i40e_nvmupd_state {
 	I40E_NVMUPD_STATE_WRITING,
 	I40E_NVMUPD_STATE_INIT_WAIT,
 	I40E_NVMUPD_STATE_WRITE_WAIT,
+	I40E_NVMUPD_STATE_ERROR
 };
 
 /* nvm_access definition and its masks/shifts need to be accessible to