i40e/i40evf: Add nvmupdate support

This implements a state machine intended to support the userland tool for
updating the device eeprom. The state machine implements one-shot reads,
writes, multi-step write sessions, and checksum requests. If we're in the middle
of a multi-step write session, no one should fire off other writes, however, one
shot reads are valid. The userland tool is expected to keep track of its session
status, arrange the placement and ordering of the writes, and deal with the
checksum requirement.

This patch also adds nvmupdate support to ethtool callbacks.
The get_eeprom() and set_eeprom() services in ethtool are used here to
facilitate the userland NVMUpdate tool.  The 'magic' value in the get and
set commands is used to pass additional control information for managing
the read and write steps.

The read operation works both as normally expected in the standard ethtool
method, as well as with the extra NVM controls.  The write operation
works only for the expanded NVM functions - the normal ethtool method is
not allowed because of the NVM semaphore management needed for multipart
writes, as well as the checksum requirement.

Change-ID: I1d84a170153a9f437906744e2e350fd68fe7563d
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Tested-by: Jim Young <jamesx.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 88 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index c65f4e8e6cee..f4e502a305ff 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -2121,6 +2121,47 @@ i40e_aq_read_nvm_exit:
 	return status;
 }
 
+/**
+ * i40e_aq_erase_nvm
+ * @hw: pointer to the hw struct
+ * @module_pointer: module pointer location in words from the NVM beginning
+ * @offset: offset in the module (expressed in 4 KB from module's beginning)
+ * @length: length of the section to be erased (expressed in 4 KB)
+ * @last_command: tells if this is the last command in a series
+ * @cmd_details: pointer to command details structure or NULL
+ *
+ * Erase the NVM sector using the admin queue commands
+ **/
+i40e_status i40e_aq_erase_nvm(struct i40e_hw *hw, u8 module_pointer,
+			      u32 offset, u16 length, bool last_command,
+			      struct i40e_asq_cmd_details *cmd_details)
+{
+	struct i40e_aq_desc desc;
+	struct i40e_aqc_nvm_update *cmd =
+		(struct i40e_aqc_nvm_update *)&desc.params.raw;
+	i40e_status status;
+
+	/* In offset the highest byte must be zeroed. */
+	if (offset & 0xFF000000) {
+		status = I40E_ERR_PARAM;
+		goto i40e_aq_erase_nvm_exit;
+	}
+
+	i40e_fill_default_direct_cmd_desc(&desc, i40e_aqc_opc_nvm_erase);
+
+	/* If this is the last command in a series, set the proper flag. */
+	if (last_command)
+		cmd->command_flags |= I40E_AQ_NVM_LAST_CMD;
+	cmd->module_pointer = module_pointer;
+	cmd->offset = cpu_to_le32(offset);
+	cmd->length = cpu_to_le16(length);
+
+	status = i40e_asq_send_command(hw, &desc, NULL, 0, cmd_details);
+
+i40e_aq_erase_nvm_exit:
+	return status;
+}
+
 #define I40E_DEV_FUNC_CAP_SWITCH_MODE	0x01
 #define I40E_DEV_FUNC_CAP_MGMT_MODE	0x02
 #define I40E_DEV_FUNC_CAP_NPAR		0x03
@@ -2351,6 +2392,53 @@ exit:
 }
 
 /**
+ * i40e_aq_update_nvm
+ * @hw: pointer to the hw struct
+ * @module_pointer: module pointer location in words from the NVM beginning
+ * @offset: byte offset from the module beginning
+ * @length: length of the section to be written (in bytes from the offset)
+ * @data: command buffer (size [bytes] = length)
+ * @last_command: tells if this is the last command in a series
+ * @cmd_details: pointer to command details structure or NULL
+ *
+ * Update the NVM using the admin queue commands
+ **/
+i40e_status i40e_aq_update_nvm(struct i40e_hw *hw, u8 module_pointer,
+			       u32 offset, u16 length, void *data,
+			       bool last_command,
+			       struct i40e_asq_cmd_details *cmd_details)
+{
+	struct i40e_aq_desc desc;
+	struct i40e_aqc_nvm_update *cmd =
+		(struct i40e_aqc_nvm_update *)&desc.params.raw;
+	i40e_status status;
+
+	/* In offset the highest byte must be zeroed. */
+	if (offset & 0xFF000000) {
+		status = I40E_ERR_PARAM;
+		goto i40e_aq_update_nvm_exit;
+	}
+
+	i40e_fill_default_direct_cmd_desc(&desc, i40e_aqc_opc_nvm_update);
+
+	/* If this is the last command in a series, set the proper flag. */
+	if (last_command)
+		cmd->command_flags |= I40E_AQ_NVM_LAST_CMD;
+	cmd->module_pointer = module_pointer;
+	cmd->offset = cpu_to_le32(offset);
+	cmd->length = cpu_to_le16(length);
+
+	desc.flags |= cpu_to_le16((u16)(I40E_AQ_FLAG_BUF | I40E_AQ_FLAG_RD));
+	if (length > I40E_AQ_LARGE_BUF)
+		desc.flags |= cpu_to_le16((u16)I40E_AQ_FLAG_LB);
+
+	status = i40e_asq_send_command(hw, &desc, data, length, cmd_details);
+
+i40e_aq_update_nvm_exit:
+	return status;
+}
+
+/**
  * i40e_aq_get_lldp_mib
  * @hw: pointer to the hw struct
  * @bridge_type: type of bridge requested