linux_kernel/drivers/net/ethernet/intel/ice/ice_switch.c

// 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;
}