ice: add support for sideband messages

In order to support certain device features, including enabling the PTP
hardware clock, the ice driver needs to control some registers on the
device PHY.

These registers are accessed by sending sideband messages. For some
hardware, these messages must be sent over the device admin queue, while
other hardware has a dedicated control queue for the sideband messages.

Add the neighbor device message structure for sending a message to the
neighboring device. Where supported, initialize the sideband control
queue and handle cleanup.

Add a wrapper function for sending sideband control queue messages that
read or write a neighboring device register.

Because some devices send sideband messages over the AdminQ, also
increase the length of the admin queue to allow more messages to be
queued up. This is important because the sideband messages add
additional pressure on the AQ usage.

This support will be used in following patches to enable support for
CONFIG_1588_PTP_CLOCK.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index f687d1f6b765..298e654583bd 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -1293,6 +1293,64 @@ const struct ice_ctx_ele ice_tlan_ctx_info[] = {
 	{ 0 }
 };
 
+/* Sideband Queue command wrappers */
+
+/**
+ * ice_sbq_send_cmd - send Sideband Queue command to Sideband Queue
+ * @hw: pointer to the HW struct
+ * @desc: descriptor describing the command
+ * @buf: buffer to use for indirect commands (NULL for direct commands)
+ * @buf_size: size of buffer for indirect commands (0 for direct commands)
+ * @cd: pointer to command details structure
+ */
+static int
+ice_sbq_send_cmd(struct ice_hw *hw, struct ice_sbq_cmd_desc *desc,
+		 void *buf, u16 buf_size, struct ice_sq_cd *cd)
+{
+	return ice_status_to_errno(ice_sq_send_cmd(hw, ice_get_sbq(hw),
+						   (struct ice_aq_desc *)desc,
+						   buf, buf_size, cd));
+}
+
+/**
+ * ice_sbq_rw_reg - Fill Sideband Queue command
+ * @hw: pointer to the HW struct
+ * @in: message info to be filled in descriptor
+ */
+int ice_sbq_rw_reg(struct ice_hw *hw, struct ice_sbq_msg_input *in)
+{
+	struct ice_sbq_cmd_desc desc = {0};
+	struct ice_sbq_msg_req msg = {0};
+	u16 msg_len;
+	int status;
+
+	msg_len = sizeof(msg);
+
+	msg.dest_dev = in->dest_dev;
+	msg.opcode = in->opcode;
+	msg.flags = ICE_SBQ_MSG_FLAGS;
+	msg.sbe_fbe = ICE_SBQ_MSG_SBE_FBE;
+	msg.msg_addr_low = cpu_to_le16(in->msg_addr_low);
+	msg.msg_addr_high = cpu_to_le32(in->msg_addr_high);
+
+	if (in->opcode)
+		msg.data = cpu_to_le32(in->data);
+	else
+		/* data read comes back in completion, so shorten the struct by
+		 * sizeof(msg.data)
+		 */
+		msg_len -= sizeof(msg.data);
+
+	desc.flags = cpu_to_le16(ICE_AQ_FLAG_RD);
+	desc.opcode = cpu_to_le16(ice_sbq_opc_neigh_dev_req);
+	desc.param0.cmd_len = cpu_to_le16(msg_len);
+	status = ice_sbq_send_cmd(hw, &desc, &msg, msg_len, NULL);
+	if (!status && !in->opcode)
+		in->data = le32_to_cpu
+			(((struct ice_sbq_msg_cmpl *)&msg)->data);
+	return status;
+}
+
 /* FW Admin Queue command wrappers */
 
 /* Software lock/mutex that is meant to be held while the Global Config Lock