bal_release/src/core/util/switch/dpp/bal_dpp_qos_map.c

/******************************************************************************
 *
 *  <:copyright-BRCM:2016:DUAL/GPL:standard
 *  
 *     Copyright (c) 2016 Broadcom
 *     All Rights Reserved
 *  
 *  Unless you and Broadcom execute a separate written software license
 *  agreement governing use of this software, this software is licensed
 *  to you under the terms of the GNU General Public License version 2
 *  (the "GPL"), available at http://www.broadcom.com/licenses/GPLv2.php,
 *  with the following added to such license:
 *  
 *     As a special exception, the copyright holders of this software give
 *     you permission to link this software with independent modules, and
 *     to copy and distribute the resulting executable under terms of your
 *     choice, provided that you also meet, for each linked independent
 *     module, the terms and conditions of the license of that module.
 *     An independent module is a module which is not derived from this
 *     software.  The special exception does not apply to any modifications
 *     of the software.
 *  
 *  Not withstanding the above, under no circumstances may you combine
 *  this software in any way with any other Broadcom software provided
 *  under a license other than the GPL, without Broadcom's express prior
 *  written consent.
 *  
 *  :>
 *
 *****************************************************************************/
 
/**
 * @file bal_dpp_qos_map.c
 * @brief BAL Switch Util QoS map management API
 *
 * This file contains the data structures and functions for
 * configuring and managing the pcp bits translation services for
 * DUNE Pack Processor (DPP). 
 *
 * The pcp translation service is accomplished using ING ingress vlan translation API
 * The API required a Qos map table for pcp translatin on a LIF.
 * This file defines 15 pre-map tables for all known use cases.
 *
 * A set of utilities API are included for callers to determine which table to use
 *
 * ********************************************************************************
 *
 */

/*@{*/
#ifndef TEST_SW_UTIL_LOOPBACK

#include <stdint.h> 

#include "bcm_dev_log.h"
#include "bcmos_errno.h"
#include "bal_dpp_qos_map.h"

#include "bal_switch_util.h"  /* for definition of log_id_sw_util */

#include "bcm/error.h"
#include "bcm/qos.h"

#define BAL_BCM_PCP_MAP_NUM        15
#define BAL_BCM_PCP_MAP_ENTRIES     8
#define BAL_BCM_MAX_PCP_VALUE       7
#define BAL_BCM_FIXED_PCP_MAP_NUM   8


const int g_bal_bcm_qos_pcp_map[BAL_BCM_PCP_MAP_NUM][BAL_BCM_PCP_MAP_ENTRIES] =
{
    {0, 0, 0, 0, 0, 0, 0, 0},     /* 0-7 --> 0 */
    {1, 1, 1, 1, 1, 1, 1, 1},     /* 0-7 --> 1 */
    {2, 2, 2, 2, 2, 2, 2, 2},     /* 0-7 --> 2 */
    {3, 3, 3, 3, 3, 3, 3, 3},     /* 0-7 --> 3 */
    {4, 4, 4, 4, 4, 4, 4, 4},     /* 0-7 --> 4 */
    {5, 5, 5, 5, 5, 5, 5, 5},     /* 0-7 --> 5 */
    {6, 6, 6, 6, 6, 6, 6, 6},     /* 0-7 --> 6 */
    {7, 7, 7, 7, 7, 7, 7, 7},     /* 0-7 --> 7 */
    {1, 2, 3, 4, 5, 6, 7, 0},     /* 0-6 --> 1-7, 7  ->0    offset = 1 or -7 */
    {2, 3, 4, 5, 6, 7, 0, 1},     /* 0-5 --> 2-7, 6-7->0-1  offset = 2 or -6 */
    {3, 4, 5, 6, 7, 0, 1, 2},     /* 0-4 --> 3-7, 5-7->0-2  offset = 3 or -5 */
    {4, 5, 6, 7, 0, 1, 2, 3},     /* 0-3 --> 4-7, 4-7->0-3  offset = 4 or -4 */
    {5, 6, 7, 0, 1, 2, 3, 4},     /* 0-2 --> 5-7, 3-7->0-4  offset = 5 or -3 */
    {6, 7, 0, 1, 2, 3, 4, 5},     /* 0-1 --> 6-7, 2-7->0-5  offset = 6 or -2 */
    {7, 0, 1, 2, 3, 4, 5, 6},     /* 0   --> 7,   1-7->0-6  offset = 7 or -1 */  
};

static int g_bal_bcm_pcp_remark_map_id[BAL_BCM_PCP_MAP_NUM];

/**************************************************************************/
/**
 * @brief Create the PCP remark mapping tables
 *
 * This function creates the mapping from PCP bits in the
 * frames received by DPP to the internal priority in
 * DPP. The created map id are used in the ingress vlan translation API
 * to perform PCP bits replacement.
 *
 * 
 * @param unit    SDK unit number
 *
 * @return bcmos_errno
 *
 **************************************************************************/                	
bcmos_errno bal_sw_dpp_pcp_remark_maps_init(int unit)
{
    bcm_error_t sdk_rc = BCM_E_NONE;
    bcm_qos_map_t l2_in_map;
    int map_id, pcp;    
    int32_t qos_map_id;

  
    for(map_id=0; map_id < BAL_BCM_PCP_MAP_NUM; map_id++)
    {
        /* in case anything goes wrong */
        g_bal_bcm_pcp_remark_map_id[map_id] = BAL_BCM_INVALID_PCP_MAP_ID;
        
        /* Create a map object */
        sdk_rc = bcm_qos_map_create(unit, BCM_QOS_MAP_INGRESS| BCM_QOS_MAP_L2_VLAN_PCP, &qos_map_id);
        if (sdk_rc != BCM_E_NONE) 
        {
            /* Error */
            BCM_LOG(ERROR, log_id_sw_util,
                        "bcm_qos_map_create failed with %s\n",
                         bcm_errmsg(sdk_rc));

            return BCM_ERR_INTERNAL;
        }

        /* Create a mapping for each PCP bits value. */
        for (pcp = 0; pcp < BAL_BCM_PCP_MAP_ENTRIES; pcp++) 
        {         
            bcm_qos_map_t_init(&l2_in_map);
            
            /* Ingress PCP/CoS value */
            l2_in_map.pkt_pri = g_bal_bcm_qos_pcp_map[map_id][pcp];      
 
            /* Set internal priority for this ingress pri */
            l2_in_map.int_pri = pcp;
            
            /* Set color for this ingress Priority  */
            l2_in_map.color = bcmColorGreen;
            
            sdk_rc = bcm_qos_map_add(unit, BCM_QOS_MAP_L2_OUTER_TAG|BCM_QOS_MAP_L2|BCM_QOS_MAP_L2_VLAN_PCP, &l2_in_map, qos_map_id);
            if (sdk_rc != BCM_E_NONE) 
            {
                /* Error */
                BCM_LOG(ERROR, log_id_sw_util,
                            "bcm_qos_map_add failed with %s, for pcp %d\n",
                             bcm_errmsg(sdk_rc), pcp);
             
                return BCM_ERR_INTERNAL;
            }
        
        }

        g_bal_bcm_pcp_remark_map_id[map_id] = qos_map_id;
    }
    return BCM_ERR_OK;
}

/**************************************************************************/
/**
 * @brief Retrieve PCP remark mapping table ID according to the translation
 *
 * This function retrieve the pre-created mapping table id associate with
 * the translation.
 * The created map id can be used in the ingress vlan translation API
 * to perform PCP bits replacement.
 *
 * @param src_pcp    the pcp value that need to be translated, or -1 for DONTCARE
 * @param dst_pcp    the translated pcp value
 * @param p_map_id   pointer for the retrieved id
 *
 * @return bcmos_errno
 *
 **************************************************************************/
bcmos_errno bal_sw_dpp_pcp_remark_map_get(int src_pcp, int dst_pcp, int *p_map_id)
{
    int offset;
    unsigned int indx;
    
    if(dst_pcp < 0 || dst_pcp > BAL_BCM_MAX_PCP_VALUE)
    {
       BCM_LOG(ERROR, log_id_sw_util,
            "%s(): invalid destination pcp = %d\n", __FUNCTION__, dst_pcp);
        return BCM_ERR_PARM;
    }
    /* if source is DONTCARE, i.e map to a fixed PCP, use the first 8 map tables */
    if(src_pcp == -1)
    {
        *p_map_id = g_bal_bcm_pcp_remark_map_id[dst_pcp];
    }
    else
    {
        if(src_pcp < 0 || src_pcp > BAL_BCM_MAX_PCP_VALUE)
        {
            BCM_LOG(ERROR, log_id_sw_util,
                "%s(): invalid source pcp = %d\n", __FUNCTION__, src_pcp);
            return BCM_ERR_PARM;
        }
        /* find out the offset between the src_pcp and dst_pcp */
        offset = dst_pcp - src_pcp;
        if (offset == 0)
        {
            BCM_LOG(ERROR, log_id_sw_util,
                "%s(): source pcp %d == destination pcp %d\n", __FUNCTION__, src_pcp, dst_pcp);
            return BCM_ERR_NOT_SUPPORTED;
        }      
        if (offset < 0)
        {
            /* see comments in the above map tables */
            offset += BAL_BCM_PCP_MAP_ENTRIES;
        }

        indx = offset + BAL_BCM_FIXED_PCP_MAP_NUM - 1;
        if(indx >= BAL_BCM_PCP_MAP_NUM)
        {
           BCM_LOG(ERROR, log_id_sw_util,
                "%s(): something is wrong, invalid map index = %d\n", __FUNCTION__, indx);
            return BCM_ERR_INTERNAL;
        }
        /* index is 0 based */
        *p_map_id = g_bal_bcm_pcp_remark_map_id[indx];
                    
    }
    
    BCM_LOG(INFO, log_id_sw_util,
            "%s(): pbits translate %d -> %d using bal qos map table %d, id 0x%x\n", __FUNCTION__, src_pcp, dst_pcp, indx, *p_map_id);
    return BCM_ERR_OK;
}

#endif  /* TEST_SW_UTIL_LOOPBACK */

/*@}*/