Date: Tue, 19 Oct 2010 23:04:24 +0000 (UTC) From: Pyun YongHyeon <yongari@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r214087 - head/sys/dev/bge Message-ID: <201010192304.o9JN4ORq030096@svn.freebsd.org>
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Author: yongari Date: Tue Oct 19 23:04:23 2010 New Revision: 214087 URL: http://svn.freebsd.org/changeset/base/214087 Log: Add workaround for BCM5906 controller silicon bug. If device receive two back-to-back send BDs with less than or equal to 8 total bytes then the device may hang. The two back-to-back send BDs must be in the same frame for this failure to occur. Thanks to davidch for detailed errata information. Reviewed by: davidch 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 Tue Oct 19 22:11:50 2010 (r214086) +++ head/sys/dev/bge/if_bge.c Tue Oct 19 23:04:23 2010 (r214087) @@ -374,6 +374,7 @@ static void bge_tick(void *); static void bge_stats_clear_regs(struct bge_softc *); static void bge_stats_update(struct bge_softc *); static void bge_stats_update_regs(struct bge_softc *); +static struct mbuf *bge_check_short_dma(struct mbuf *); static struct mbuf *bge_setup_tso(struct bge_softc *, struct mbuf *, uint16_t *); static int bge_encap(struct bge_softc *, struct mbuf **, uint32_t *); @@ -2633,6 +2634,8 @@ bge_attach(device_t dev) case BGE_ASICREV_BCM5752: case BGE_ASICREV_BCM5906: sc->bge_flags |= BGE_FLAG_575X_PLUS; + if (sc->bge_asicrev == BGE_ASICREV_BCM5906) + sc->bge_flags |= BGE_FLAG_SHORT_DMA_BUG; /* FALLTHROUGH */ case BGE_ASICREV_BCM5705: sc->bge_flags |= BGE_FLAG_5705_PLUS; @@ -4060,6 +4063,39 @@ bge_cksum_pad(struct mbuf *m) } static struct mbuf * +bge_check_short_dma(struct mbuf *m) +{ + struct mbuf *n; + int found; + + /* + * If device receive two back-to-back send BDs with less than + * or equal to 8 total bytes then the device may hang. The two + * back-to-back send BDs must in the same frame for this failure + * to occur. Scan mbuf chains and see whether two back-to-back + * send BDs are there. If this is the case, allocate new mbuf + * and copy the frame to workaround the silicon bug. + */ + for (n = m, found = 0; n != NULL; n = n->m_next) { + if (n->m_len < 8) { + found++; + if (found > 1) + break; + continue; + } + found = 0; + } + + if (found > 1) { + n = m_defrag(m, M_DONTWAIT); + if (n == NULL) + m_freem(m); + } else + n = m; + return (n); +} + +static struct mbuf * bge_setup_tso(struct bge_softc *sc, struct mbuf *m, uint16_t *mss) { struct ip *ip; @@ -4132,6 +4168,13 @@ bge_encap(struct bge_softc *sc, struct m csum_flags = 0; mss = 0; vlan_tag = 0; + if ((sc->bge_flags & BGE_FLAG_SHORT_DMA_BUG) != 0 && + m->m_next != NULL) { + *m_head = bge_check_short_dma(m); + if (*m_head == NULL) + return (ENOBUFS); + m = *m_head; + } if ((m->m_pkthdr.csum_flags & CSUM_TSO) != 0) { *m_head = m = bge_setup_tso(sc, m, &mss); if (*m_head == NULL) Modified: head/sys/dev/bge/if_bgereg.h ============================================================================== --- head/sys/dev/bge/if_bgereg.h Tue Oct 19 22:11:50 2010 (r214086) +++ head/sys/dev/bge/if_bgereg.h Tue Oct 19 23:04:23 2010 (r214087) @@ -2727,6 +2727,7 @@ struct bge_softc { #define BGE_FLAG_40BIT_BUG 0x01000000 #define BGE_FLAG_4G_BNDRY_BUG 0x02000000 #define BGE_FLAG_RX_ALIGNBUG 0x04000000 +#define BGE_FLAG_SHORT_DMA_BUG 0x08000000 uint32_t bge_phy_flags; #define BGE_PHY_WIRESPEED 0x00000001 #define BGE_PHY_ADC_BUG 0x00000002
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