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Commit 4634b794 authored by Mitko Haralanov's avatar Mitko Haralanov Committed by Roland Dreier
Browse files

IB/qib: Set default LE2 value for active cables to 0 



For active and far-EQ cables use an LE2 value of 0 for improved SI.

Signed-off-by: default avatarMitko Haralanov <mitko@qlogic.com>
Signed-off-by: default avatarMike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: default avatarRoland Dreier <roland@purestorage.com>
parent cc7fb059

drivers/infiniband/hw/qib/qib_iba7322.c

+10 −3
Original line number Diff line number Diff line
@@ -5582,9 +5582,16 @@ static void qsfp_7322_event(struct work_struct *work) 
	 * even on failure to read cable information.  We don't

	 * get here for QME, so IS_QME check not needed here.

	 */

	le2 = (!ret && qd->cache.atten[1] >= qib_long_atten &&

	       !ppd->dd->cspec->r1 && QSFP_IS_CU(qd->cache.tech)) ?

		LE2_5m : LE2_DEFAULT;

	if (!ret && !ppd->dd->cspec->r1) {

		if (QSFP_IS_ACTIVE_FAR(qd->cache.tech))

			le2 = LE2_QME;

		else if (qd->cache.atten[1] >= qib_long_atten &&

			 QSFP_IS_CU(qd->cache.tech))

			le2 = LE2_5m;

		else

			le2 = LE2_DEFAULT;

	} else

		le2 = LE2_DEFAULT;

	ibsd_wr_allchans(ppd, 13, (le2 << 7), BMASK(9, 7));

	init_txdds_table(ppd, 0);

}

drivers/infiniband/hw/qib/qib_qsfp.h

+2 −0
Original line number Diff line number Diff line
@@ -79,6 +79,8 @@ 
extern const char *const qib_qsfp_devtech[16];

/* Active Equalization includes fiber, copper full EQ, and copper near Eq */

#define QSFP_IS_ACTIVE(tech) ((0xA2FF >> ((tech) >> 4)) & 1)

/* Active Equalization includes fiber, copper full EQ, and copper far Eq */

#define QSFP_IS_ACTIVE_FAR(tech) ((0x32FF >> ((tech) >> 4)) & 1)

/* Attenuation should be valid for copper other than full/near Eq */

#define QSFP_HAS_ATTEN(tech) ((0x4D00 >> ((tech) >> 4)) & 1)

/* Length is only valid if technology is "copper" */