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/**
 * @file
 *
 * Small helper utilities.
 *
 * <hr>$Revision: 49448 $<hr>
 */

#ifndef __CVMX_HELPER_UTIL_H__
#define __CVMX_HELPER_UTIL_H__


#ifdef CVMX_ENABLE_HELPER_FUNCTIONS

/**
 * Convert a interface mode into a human readable string
 *
 * @param mode   Mode to convert
 *
 * @return String
 */
extern const char *cvmx_helper_interface_mode_to_string(cvmx_helper_interface_mode_t mode);

/**
 * Debug routine to dump the packet structure to the console
 *
 * @param work   Work queue entry containing the packet to dump
 * @return
 */
extern int cvmx_helper_dump_packet(cvmx_wqe_t *work);

/**
 * Setup Random Early Drop on a specific input queue
 *
 * @param queue  Input queue to setup RED on (0-7)
 * @param pass_thresh
 *               Packets will begin slowly dropping when there are less than
 *               this many packet buffers free in FPA 0.
 * @param drop_thresh
 *               All incomming packets will be dropped when there are less
 *               than this many free packet buffers in FPA 0.
 * @return Zero on success. Negative on failure
 */
extern int cvmx_helper_setup_red_queue(int queue, int pass_thresh, int drop_thresh);

/**
 * Setup Random Early Drop to automatically begin dropping packets.
 *
 * @param pass_thresh
 *               Packets will begin slowly dropping when there are less than
 *               this many packet buffers free in FPA 0.
 * @param drop_thresh
 *               All incomming packets will be dropped when there are less
 *               than this many free packet buffers in FPA 0.
 * @return Zero on success. Negative on failure
 */
extern int cvmx_helper_setup_red(int pass_thresh, int drop_thresh);


/**
 * Get the version of the CVMX libraries.
 *
 * @return Version string. Note this buffer is allocated statically
 *         and will be shared by all callers.
 */
extern const char *cvmx_helper_get_version(void);


/**
 * @INTERNAL
 * Setup the common GMX settings that determine the number of
 * ports. These setting apply to almost all configurations of all
 * chips.
 *
 * @param interface Interface to configure
 * @param num_ports Number of ports on the interface
 *
 * @return Zero on success, negative on failure
 */
extern int __cvmx_helper_setup_gmx(int interface, int num_ports);

/**
 * Returns the IPD/PKO port number for a port on the given
 * interface.
 *
 * @param interface Interface to use
 * @param port      Port on the interface
 *
 * @return IPD/PKO port number
 */
extern int cvmx_helper_get_ipd_port(int interface, int port);


/**
 * Returns the IPD/PKO port number for the first port on the given
 * interface.
 *
 * @param interface Interface to use
 *
 * @return IPD/PKO port number
 */
static inline int cvmx_helper_get_first_ipd_port(int interface)
{
    return (cvmx_helper_get_ipd_port (interface, 0));
}

/**
 * Returns the IPD/PKO port number for the last port on the given
 * interface.
 *
 * @param interface Interface to use
 *
 * @return IPD/PKO port number
 */
static inline int cvmx_helper_get_last_ipd_port (int interface)
{
    return (cvmx_helper_get_first_ipd_port (interface) +
  	    cvmx_helper_ports_on_interface (interface) - 1);
}


/**
 * Free the packet buffers contained in a work queue entry.
 * The work queue entry is not freed.
 *
 * @param work   Work queue entry with packet to free
 */
static inline void cvmx_helper_free_packet_data(cvmx_wqe_t *work)
{
    uint64_t        number_buffers;
    cvmx_buf_ptr_t  buffer_ptr;
    cvmx_buf_ptr_t  next_buffer_ptr;
    uint64_t        start_of_buffer;

    number_buffers = work->word2.s.bufs;
    if (number_buffers == 0)
        return;
    buffer_ptr = work->packet_ptr;

    /* Since the number of buffers is not zero, we know this is not a dynamic
        short packet. We need to check if it is a packet received with
        IPD_CTL_STATUS[NO_WPTR]. If this is true, we need to free all buffers
        except for the first one. The caller doesn't expect their WQE pointer
        to be freed */
    start_of_buffer = ((buffer_ptr.s.addr >> 7) - buffer_ptr.s.back) << 7;
    if (cvmx_ptr_to_phys(work) == start_of_buffer)
    {
        next_buffer_ptr = *(cvmx_buf_ptr_t*)cvmx_phys_to_ptr(buffer_ptr.s.addr - 8);
        buffer_ptr = next_buffer_ptr;
        number_buffers--;
    }

    while (number_buffers--)
    {
        /* Remember the back pointer is in cache lines, not 64bit words */
        start_of_buffer = ((buffer_ptr.s.addr >> 7) - buffer_ptr.s.back) << 7;
        /* Read pointer to next buffer before we free the current buffer. */
        next_buffer_ptr = *(cvmx_buf_ptr_t*)cvmx_phys_to_ptr(buffer_ptr.s.addr - 8);
        cvmx_fpa_free(cvmx_phys_to_ptr(start_of_buffer), buffer_ptr.s.pool, 0);
        buffer_ptr = next_buffer_ptr;
    }
}

#endif /* CVMX_ENABLE_HELPER_FUNCTIONS */

/**
 * Returns the interface number for an IPD/PKO port number.
 *
 * @param ipd_port IPD/PKO port number
 *
 * @return Interface number
 */
extern int cvmx_helper_get_interface_num(int ipd_port);


/**
 * Returns the interface index number for an IPD/PKO port
 * number.
 *
 * @param ipd_port IPD/PKO port number
 *
 * @return Interface index number
 */
extern int cvmx_helper_get_interface_index_num(int ipd_port);

#endif  /* __CVMX_HELPER_H__ */