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bnx2x: properly configure coefficients for MinBW algorithm (NPAR mode).

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Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Kravkov 2011-02-28 03:37:11 +00:00 committed by David S. Miller
parent 633ac3637a
commit ff80ee029b
2 changed files with 17 additions and 12 deletions
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26
drivers/net/bnx2x/bnx2x.h
View File

@ -1613,19 +1613,23 @@ static inline u32 reg_poll(struct bnx2x *bp, u32 reg, u32 expected, int ms,
#define BNX2X_BTR 4
#define MAX_SPQ_PENDING 8
/* CMNG constants
derived from lab experiments, and not from system spec calculations !!! */
#define DEF_MIN_RATE 100
/* CMNG constants, as derived from system spec calculations */
/* default MIN rate in case VNIC min rate is configured to zero - 100Mbps */
#define DEF_MIN_RATE 100
/* resolution of the rate shaping timer - 100 usec */
#define RS_PERIODIC_TIMEOUT_USEC 100
/* resolution of fairness algorithm in usecs -
coefficient for calculating the actual t fair */
#define T_FAIR_COEF 10000000
#define RS_PERIODIC_TIMEOUT_USEC 100
/* number of bytes in single QM arbitration cycle -
coefficient for calculating the fairness timer */
#define QM_ARB_BYTES 40000
#define FAIR_MEM 2
* coefficient for calculating the fairness timer */
#define QM_ARB_BYTES 160000
/* resolution of Min algorithm 1:100 */
#define MIN_RES 100
/* how many bytes above threshold for the minimal credit of Min algorithm*/
#define MIN_ABOVE_THRESH 32768
/* Fairness algorithm integration time coefficient -
* for calculating the actual Tfair */
#define T_FAIR_COEF ((MIN_ABOVE_THRESH + QM_ARB_BYTES) * 8 * MIN_RES)
/* Memory of fairness algorithm . 2 cycles */
#define FAIR_MEM 2
#define ATTN_NIG_FOR_FUNC (1L << 8)

3
drivers/net/bnx2x/bnx2x_main.c
View File

@ -2015,7 +2015,8 @@ static void bnx2x_init_vn_minmax(struct bnx2x *bp, int vn)
m_fair_vn.vn_credit_delta =
max_t(u32, (vn_min_rate * (T_FAIR_COEF /
(8 * bp->vn_weight_sum))),
(bp->cmng.fair_vars.fair_threshold * 2));
(bp->cmng.fair_vars.fair_threshold +
MIN_ABOVE_THRESH));
DP(NETIF_MSG_IFUP, "m_fair_vn.vn_credit_delta %d\n",
m_fair_vn.vn_credit_delta);
}