ice: Get switch config, scheduler config and device capabilities

This patch adds to the initialization flow by getting switch
configuration, scheduler configuration and device capabilities.

Switch configuration:
On boot, an L2 switch element is created in the firmware per physical
function. Each physical function is also mapped to a port, to which its
switch element is connected. In other words, this switch can be visualized
as an embedded vSwitch that can connect a physical function's virtual
station interfaces (VSIs) to the egress/ingress port. Egress/ingress
filters will be eventually created and applied on this switch element.
As part of the initialization flow, the driver gets configuration data
from this switch element and stores it.

Scheduler configuration:
The Tx scheduler is a subsystem responsible for setting and enforcing QoS.
As part of the initialization flow, the driver queries and stores the
default scheduler configuration for the given physical function.

Device capabilities:
As part of initialization, the driver has to determine what the device is
capable of (ex. max queues, VSIs, etc). This information is obtained from
the firmware and stored by the driver.

CC: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Acked-by: Shannon Nelson <shannon.nelson@oracle.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 144 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c
new file mode 100644
index 000000000000..8fc0579b0bbb
--- /dev/null
+++ b/drivers/net/ethernet/intel/ice/ice_switch.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2018, Intel Corporation. */
+
+#include "ice_switch.h"
+
+/**
+ * ice_aq_get_sw_cfg - get switch configuration
+ * @hw: pointer to the hardware structure
+ * @buf: pointer to the result buffer
+ * @buf_size: length of the buffer available for response
+ * @req_desc: pointer to requested descriptor
+ * @num_elems: pointer to number of elements
+ * @cd: pointer to command details structure or NULL
+ *
+ * Get switch configuration (0x0200) to be placed in 'buff'.
+ * This admin command returns information such as initial VSI/port number
+ * and switch ID it belongs to.
+ *
+ * NOTE: *req_desc is both an input/output parameter.
+ * The caller of this function first calls this function with *request_desc set
+ * to 0.  If the response from f/w has *req_desc set to 0, all the switch
+ * configuration information has been returned; if non-zero (meaning not all
+ * the information was returned), the caller should call this function again
+ * with *req_desc set to the previous value returned by f/w to get the
+ * next block of switch configuration information.
+ *
+ * *num_elems is output only parameter. This reflects the number of elements
+ * in response buffer. The caller of this function to use *num_elems while
+ * parsing the response buffer.
+ */
+static enum ice_status
+ice_aq_get_sw_cfg(struct ice_hw *hw, struct ice_aqc_get_sw_cfg_resp *buf,
+		  u16 buf_size, u16 *req_desc, u16 *num_elems,
+		  struct ice_sq_cd *cd)
+{
+	struct ice_aqc_get_sw_cfg *cmd;
+	enum ice_status status;
+	struct ice_aq_desc desc;
+
+	ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_get_sw_cfg);
+	cmd = &desc.params.get_sw_conf;
+	cmd->element = cpu_to_le16(*req_desc);
+
+	status = ice_aq_send_cmd(hw, &desc, buf, buf_size, cd);
+	if (!status) {
+		*req_desc = le16_to_cpu(cmd->element);
+		*num_elems = le16_to_cpu(cmd->num_elems);
+	}
+
+	return status;
+}
+
+/* ice_init_port_info - Initialize port_info with switch configuration data
+ * @pi: pointer to port_info
+ * @vsi_port_num: VSI number or port number
+ * @type: Type of switch element (port or VSI)
+ * @swid: switch ID of the switch the element is attached to
+ * @pf_vf_num: PF or VF number
+ * @is_vf: true if the element is a VF, false otherwise
+ */
+static void
+ice_init_port_info(struct ice_port_info *pi, u16 vsi_port_num, u8 type,
+		   u16 swid, u16 pf_vf_num, bool is_vf)
+{
+	switch (type) {
+	case ICE_AQC_GET_SW_CONF_RESP_PHYS_PORT:
+		pi->lport = (u8)(vsi_port_num & ICE_LPORT_MASK);
+		pi->sw_id = swid;
+		pi->pf_vf_num = pf_vf_num;
+		pi->is_vf = is_vf;
+		pi->dflt_tx_vsi_num = ICE_DFLT_VSI_INVAL;
+		pi->dflt_rx_vsi_num = ICE_DFLT_VSI_INVAL;
+		break;
+	default:
+		ice_debug(pi->hw, ICE_DBG_SW,
+			  "incorrect VSI/port type received\n");
+		break;
+	}
+}
+
+/* ice_get_initial_sw_cfg - Get initial port and default VSI data
+ * @hw: pointer to the hardware structure
+ */
+enum ice_status ice_get_initial_sw_cfg(struct ice_hw *hw)
+{
+	struct ice_aqc_get_sw_cfg_resp *rbuf;
+	enum ice_status status;
+	u16 req_desc = 0;
+	u16 num_elems;
+	u16 i;
+
+	rbuf = devm_kzalloc(ice_hw_to_dev(hw), ICE_SW_CFG_MAX_BUF_LEN,
+			    GFP_KERNEL);
+
+	if (!rbuf)
+		return ICE_ERR_NO_MEMORY;
+
+	/* Multiple calls to ice_aq_get_sw_cfg may be required
+	 * to get all the switch configuration information. The need
+	 * for additional calls is indicated by ice_aq_get_sw_cfg
+	 * writing a non-zero value in req_desc
+	 */
+	do {
+		status = ice_aq_get_sw_cfg(hw, rbuf, ICE_SW_CFG_MAX_BUF_LEN,
+					   &req_desc, &num_elems, NULL);
+
+		if (status)
+			break;
+
+		for (i = 0; i < num_elems; i++) {
+			struct ice_aqc_get_sw_cfg_resp_elem *ele;
+			u16 pf_vf_num, swid, vsi_port_num;
+			bool is_vf = false;
+			u8 type;
+
+			ele = rbuf[i].elements;
+			vsi_port_num = le16_to_cpu(ele->vsi_port_num) &
+				ICE_AQC_GET_SW_CONF_RESP_VSI_PORT_NUM_M;
+
+			pf_vf_num = le16_to_cpu(ele->pf_vf_num) &
+				ICE_AQC_GET_SW_CONF_RESP_FUNC_NUM_M;
+
+			swid = le16_to_cpu(ele->swid);
+
+			if (le16_to_cpu(ele->pf_vf_num) &
+			    ICE_AQC_GET_SW_CONF_RESP_IS_VF)
+				is_vf = true;
+
+			type = le16_to_cpu(ele->vsi_port_num) >>
+				ICE_AQC_GET_SW_CONF_RESP_TYPE_S;
+
+			if (type == ICE_AQC_GET_SW_CONF_RESP_VSI) {
+				/* FW VSI is not needed. Just continue. */
+				continue;
+			}
+
+			ice_init_port_info(hw->port_info, vsi_port_num,
+					   type, swid, pf_vf_num, is_vf);
+		}
+	} while (req_desc && !status);
+
+	devm_kfree(ice_hw_to_dev(hw), (void *)rbuf);
+	return status;
+}