From: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date: Thu, 28 Jun 2012 03:40:17 +0000 (+0800)
Subject: bge: Limit BCM5701 B5 to 32-bit mode
X-Git-Tag: v3.2.0~755^2~7
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/33dd4678c4f21b949ac1560323e69463fd0e842a

bge: Limit BCM5701 B5 to 32-bit mode

This is a workaround for a bug which causes data corruption in
combination with certain bridges.

Obtained-from: FreeBSD 185812
---

diff --git a/sys/dev/netif/bge/if_bge.c b/sys/dev/netif/bge/if_bge.c
index 9f58abbff6..6f44e62ade 100644
--- a/sys/dev/netif/bge/if_bge.c
+++ b/sys/dev/netif/bge/if_bge.c
@@ -1295,6 +1295,16 @@ bge_chipinit(struct bge_softc *sc)
 	    BGE_MODECTL_MAC_ATTN_INTR|BGE_MODECTL_HOST_SEND_BDS|
 	    BGE_MODECTL_TX_NO_PHDR_CSUM);
 
+	/*
+	 * BCM5701 B5 have a bug causing data corruption when using
+	 * 64-bit DMA reads, which can be terminated early and then
+	 * completed later as 32-bit accesses, in combination with
+	 * certain bridges.
+	 */
+	if (sc->bge_asicrev == BGE_ASICREV_BCM5701 &&
+	    sc->bge_chipid == BGE_CHIPID_BCM5701_B5)
+		BGE_SETBIT(sc, BGE_MODE_CTL, BGE_MODECTL_FORCE_PCI32);
+
 	/*
 	 * Disable memory write invalidate.  Apparently it is not supported
 	 * properly by these devices.