Commit ff80ee02 authored by Dmitry Kravkov's avatar Dmitry Kravkov Committed by David S. Miller
Browse files

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



Signed-off-by: default avatarDmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: default avatarEilon Greenstein <eilong@broadcom.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 633ac363

drivers/net/bnx2x/bnx2x.h

+15 −11
Original line number Diff line number Diff line
@@ -1613,18 +1613,22 @@ 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 !!! */

/* 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

/* number of bytes in single QM arbitration cycle -

   coefficient for calculating the fairness timer */

#define QM_ARB_BYTES			40000

 * 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

drivers/net/bnx2x/bnx2x_main.c

+2 −1
Original line number Diff line number Diff line
@@ -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);

	}