cxgbe(4): Disable write-combined doorbells by default.
This had been the default behavior but was changed accidentally as part of the recent iw_cxgbe+OFED overhaul. Fix another bug in that change while here: the global knob affects all the adapters in the system and should be left alone by per-adapter code. MFC after: 3 days Sponsored by: Chelsio Communications
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=333448
@ -455,7 +455,7 @@ TUNABLE_INT("hw.cxgbe.iscsicaps_allowed", &t4_iscsicaps_allowed);
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static int t4_fcoecaps_allowed = 0;
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TUNABLE_INT("hw.cxgbe.fcoecaps_allowed", &t4_fcoecaps_allowed);
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static int t5_write_combine = 1;
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static int t5_write_combine = 0;
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TUNABLE_INT("hw.cxl.write_combine", &t5_write_combine);
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static int t4_num_vis = 1;
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@ -2292,7 +2292,6 @@ t4_map_bar_2(struct adapter *sc)
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setbit(&sc->doorbells, DOORBELL_WCWR);
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setbit(&sc->doorbells, DOORBELL_UDBWC);
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} else {
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t5_write_combine = 0;
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device_printf(sc->dev,
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"couldn't enable write combining: %d\n",
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rc);
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@ -2302,11 +2301,9 @@ t4_map_bar_2(struct adapter *sc)
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t4_write_reg(sc, A_SGE_STAT_CFG,
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V_STATSOURCE_T5(7) | mode);
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}
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#else
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t5_write_combine = 0;
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#endif
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sc->iwt.wc_en = t5_write_combine;
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}
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sc->iwt.wc_en = isset(&sc->doorbells, DOORBELL_UDBWC) ? 1 : 0;
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return (0);
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}
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