path: root/drivers/net/bnx2x/bnx2x_stats.c

/* bnx2x_stats.c: Broadcom Everest network driver.
 *
 * Copyright (c) 2007-2010 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * Maintained by: Eilon Greenstein <eilong@broadcom.com>
 * Written by: Eliezer Tamir
 * Based on code from Michael Chan's bnx2 driver
 * UDP CSUM errata workaround by Arik Gendelman
 * Slowpath and fastpath rework by Vladislav Zolotarov
 * Statistics and Link management by Yitchak Gertner
 *
 */
#include "bnx2x_cmn.h"
#include "bnx2x_stats.h"

/* Statistics */

/****************************************************************************
* Macros
****************************************************************************/

/* sum[hi:lo] += add[hi:lo] */
#define ADD_64(s_hi, a_hi, s_lo, a_lo) \
	do { \
		s_lo += a_lo; \
		s_hi += a_hi + ((s_lo < a_lo) ? 1 : 0); \
	} while (0)

/* difference = minuend - subtrahend */
#define DIFF_64(d_hi, m_hi, s_hi, d_lo, m_lo, s_lo) \
	do { \
		if (m_lo < s_lo) { \
			/* underflow */ \
			d_hi = m_hi - s_hi; \
			if (d_hi > 0) { \
				/* we can 'loan' 1 */ \
				d_hi--; \
				d_lo = m_lo + (UINT_MAX - s_lo) + 1; \
			} else { \
				/* m_hi <= s_hi */ \
				d_hi = 0; \
				d_lo = 0; \
			} \
		} else { \
			/* m_lo >= s_lo */ \
			if (m_hi < s_hi) { \
				d_hi = 0; \
				d_lo = 0; \
			} else { \
				/* m_hi >= s_hi */ \
				d_hi = m_hi - s_hi; \
				d_lo = m_lo - s_lo; \
			} \
		} \
	} while (0)

#define UPDATE_STAT64(s, t) \
	do { \
		DIFF_64(diff.hi, new->s##_hi, pstats->mac_stx[0].t##_hi, \
			diff.lo, new->s##_lo, pstats->mac_stx[0].t##_lo); \
		pstats->mac_stx[0].t##_hi = new->s##_hi; \
		pstats->mac_stx[0].t##_lo = new->s##_lo; \
		ADD_64(pstats->mac_stx[1].t##_hi, diff.hi, \
		       pstats->mac_stx[1].t##_lo, diff.lo); \
	} while (0)

#define UPDATE_STAT64_NIG(s, t) \
	do { \
		DIFF_64(diff.hi, new->s##_hi, old->s##_hi, \
			diff.lo, new->s##_lo, old->s##_lo); \
		ADD_64(estats->t##_hi, diff.hi, \
		       estats->t##_lo, diff.lo); \
	} while (0)

/* sum[hi:lo] += add */
#define ADD_EXTEND_64(s_hi, s_lo, a) \
	do { \
		s_lo += a; \
		s_hi += (s_lo < a) ? 1 : 0; \
	} while (0)

#define UPDATE_EXTEND_STAT(s) \
	do { \
		ADD_EXTEND_64(pstats->mac_stx[1].s##_hi, \
			      pstats->mac_stx[1].s##_lo, \
			      new->s); \
	} while (0)

#define UPDATE_EXTEND_TSTAT(s, t) \
	do { \
		diff = le32_to_cpu(tclient->s) - le32_to_cpu(old_tclient->s); \
		old_tclient->s = tclient->s; \
		ADD_EXTEND_64(qstats->t##_hi, qstats->t##_lo, diff); \
	} while (0)

#define UPDATE_EXTEND_USTAT(s, t) \
	do { \
		diff = le32_to_cpu(uclient->s) - le32_to_cpu(old_uclient->s); \
		old_uclient->s = uclient->s; \
		ADD_EXTEND_64(qstats->t##_hi, qstats->t##_lo, diff); \
	} while (0)

#define UPDATE_EXTEND_XSTAT(s, t) \
	do { \
		diff = le32_to_cpu(xclient->s) - le32_to_cpu(old_xclient->s); \
		old_xclient->s = xclient->s; \
		ADD_EXTEND_64(qstats->t##_hi, qstats->t##_lo, diff); \
	} while (0)

/* minuend -= subtrahend */
#define SUB_64(m_hi, s_hi, m_lo, s_lo) \
	do { \
		DIFF_64(m_hi, m_hi, s_hi, m_lo, m_lo, s_lo); \
	} while (0)

/* minuend[hi:lo] -= subtrahend */
#define SUB_EXTEND_64(m_hi, m_lo, s) \
	do { \
		SUB_64(m_hi, 0, m_lo, s); \
	} while (0)

#define SUB_EXTEND_USTAT(s, t) \
	do { \
		diff = le32_to_cpu(uclient->s) - le32_to_cpu(old_uclient->s); \
		SUB_EXTEND_64(qstats->t##_hi, qstats->t##_lo, diff); \
	} while (0)

/*
 * General service functions
 */

static inline long bnx2x_hilo(u32 *hiref)
{
	u32 lo = *(hiref + 1);
#i