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Code Issues Releases Activity

Disable updating InputDiscards counter for BCM5717, BCM5718,

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BCM5719 A0 and BCM5720 A0 and add comment why driver does not try
to read it.
This commit is contained in:
Pyun YongHyeon 2011-10-28 01:10:59 +00:00
parent 50515680a8
commit f78094a515
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=226872
1 changed files with 24 additions and 2 deletions
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26
sys/dev/bge/if_bge.c
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@ -4291,8 +4291,30 @@ bge_stats_update_regs(struct bge_softc *sc)
CSR_READ_4(sc, BGE_RXLP_LOCSTAT_DMA_HPWRQ_FULL);
stats->NoMoreRxBDs +=
CSR_READ_4(sc, BGE_RXLP_LOCSTAT_OUT_OF_BDS);
stats->InputDiscards +=
CSR_READ_4(sc, BGE_RXLP_LOCSTAT_IFIN_DROPS);
/*
* XXX
* Unlike other controllers, BGE_RXLP_LOCSTAT_IFIN_DROPS
* counter of BCM5717, BCM5718, BCM5719 A0 and BCM5720 A0
* includes number of unwanted multicast frames. This comes
* from silicon bug and known workaround to get rough(not
* exact) counter is to enable interrupt on MBUF low water
* attention. This can be accomplished by setting
* BGE_HCCMODE_ATTN bit of BGE_HCC_MODE,
* BGE_BMANMODE_LOMBUF_ATTN bit of BGE_BMAN_MODE and
* BGE_MODECTL_FLOWCTL_ATTN_INTR bit of BGE_MODE_CTL.
* However that change would generate more interrupts and
* there are still possibilities of losing multiple frames
* during BGE_MODECTL_FLOWCTL_ATTN_INTR interrupt handling.
* Given that the workaround still would not get correct
* counter I don't think it's worth to implement it. So
* ignore reading the counter on controllers that have the
* silicon bug.
*/
if (sc->bge_asicrev != BGE_ASICREV_BCM5717 &&
sc->bge_chipid != BGE_CHIPID_BCM5719_A0 &&
sc->bge_chipid != BGE_CHIPID_BCM5720_A0)
stats->InputDiscards +=
CSR_READ_4(sc, BGE_RXLP_LOCSTAT_IFIN_DROPS);
stats->InputErrors +=
CSR_READ_4(sc, BGE_RXLP_LOCSTAT_IFIN_ERRORS);
stats->RecvThresholdHit +=