Author: yongari
Date: Fri Oct 22 19:30:56 2010
New Revision: 214219
URL: http://svn.freebsd.org/changeset/base/214219
Log:
Add workaround for BCM5906 A1 controller silicon bug. When
auto-negotiation results in half-duplex operation, excess collision
on the ethernet link may cause internal chip delays that may result
in subsequent valid frames being dropped due to insufficient
receive buffer resources. The workaround is to choose de-pipeline
method as a flow control decision for SDI. De-pipeline method
allows only 1 data in TxMbuf at a time such that a request to RDMA
from SDI is made only when TxMbuf is empty. Thanks for david for
providing detailed errata information.
Modified:
head/sys/dev/bge/if_bge.c
head/sys/dev/bge/if_bgereg.h
Modified: head/sys/dev/bge/if_bge.c
==============================================================================
--- head/sys/dev/bge/if_bge.c Fri Oct 22 19:18:48 2010 (r214218)
+++ head/sys/dev/bge/if_bge.c Fri Oct 22 19:30:56 2010 (r214219)
@@ -1693,6 +1693,11 @@ bge_blockinit(struct bge_softc *sc)
bge_writembx(sc, BGE_MBX_RX_MINI_PROD_LO, 0);
}
+ /* Choose de-pipeline mode for BCM5906 A1. */
+ if (sc->bge_asicrev == BGE_ASICREV_BCM5906 &&
+ sc->bge_chiprev == BGE_CHIPID_BCM5906_A1)
+ CSR_WRITE_4(sc, BGE_ISO_PKT_TX,
+ (CSR_READ_4(sc, BGE_ISO_PKT_TX) & ~3) | 2);
/*
* The BD ring replenish thresholds control how often the
* hardware fetches new BD's from the producer rings in host
Modified: head/sys/dev/bge/if_bgereg.h
==============================================================================
--- head/sys/dev/bge/if_bgereg.h Fri Oct 22 19:18:48 2010
(r214218)
+++ head/sys/dev/bge/if_bgereg.h Fri Oct 22 19:30:56 2010
(r214219)
@@ -880,6 +880,7 @@
#define BGE_SDI_STATS_CTL 0x0C08
#define BGE_SDI_STATS_ENABLE_MASK 0x0C0C
#define BGE_SDI_STATS_INCREMENT_MASK 0x0C10
+#define BGE_ISO_PKT_TX 0x0C20
#define BGE_LOCSTATS_COS0 0x0C80
#define BGE_LOCSTATS_COS1 0x0C84
#define BGE_LOCSTATS_COS2 0x0C88
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