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5725 family of devices corrupts TSO packets when TSO DMA buffers

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cross into regions which are within MSS bytes of a 4GB boundary.
If we encounter the condition, drop the packet.

Reviewed by:	Geans Pin geanspin@Broacom
This commit is contained in:
Pyun YongHyeon 2013-07-22 05:45:54 +00:00
parent 2018efd098
commit b77d3a3b8e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=253540
1 changed files with 45 additions and 11 deletions
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56
sys/dev/bge/if_bge.c
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@ -5257,17 +5257,51 @@ bge_encap(struct bge_softc *sc, struct mbuf **m_head, uint32_t *txidx)
csum_flags |= BGE_TXBDFLAG_VLAN_TAG;
vlan_tag = m->m_pkthdr.ether_vtag;
}
for (i = 0; ; i++) {
d = &sc->bge_ldata.bge_tx_ring[idx];
d->bge_addr.bge_addr_lo = BGE_ADDR_LO(segs[i].ds_addr);
d->bge_addr.bge_addr_hi = BGE_ADDR_HI(segs[i].ds_addr);
d->bge_len = segs[i].ds_len;
d->bge_flags = csum_flags;
d->bge_vlan_tag = vlan_tag;
d->bge_mss = mss;
if (i == nsegs - 1)
break;
BGE_INC(idx, BGE_TX_RING_CNT);
if (sc->bge_asicrev == BGE_ASICREV_BCM5762 &&
(m->m_pkthdr.csum_flags & CSUM_TSO) != 0) {
/*
* 5725 family of devices corrupts TSO packets when TSO DMA
* buffers cross into regions which are within MSS bytes of
* a 4GB boundary. If we encounter the condition, drop the
* packet.
*/
for (i = 0; ; i++) {
d = &sc->bge_ldata.bge_tx_ring[idx];
d->bge_addr.bge_addr_lo = BGE_ADDR_LO(segs[i].ds_addr);
d->bge_addr.bge_addr_hi = BGE_ADDR_HI(segs[i].ds_addr);
d->bge_len = segs[i].ds_len;
if (d->bge_addr.bge_addr_lo + segs[i].ds_len + mss <
d->bge_addr.bge_addr_lo)
break;
d->bge_flags = csum_flags;
d->bge_vlan_tag = vlan_tag;
d->bge_mss = mss;
if (i == nsegs - 1)
break;
BGE_INC(idx, BGE_TX_RING_CNT);
}
if (i != nsegs - 1) {
bus_dmamap_sync(sc->bge_cdata.bge_tx_mtag, map,
BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->bge_cdata.bge_tx_mtag, map);
m_freem(*m_head);
*m_head = NULL;
return (EIO);
}
} else {
for (i = 0; ; i++) {
d = &sc->bge_ldata.bge_tx_ring[idx];
d->bge_addr.bge_addr_lo = BGE_ADDR_LO(segs[i].ds_addr);
d->bge_addr.bge_addr_hi = BGE_ADDR_HI(segs[i].ds_addr);
d->bge_len = segs[i].ds_len;
d->bge_flags = csum_flags;
d->bge_vlan_tag = vlan_tag;
d->bge_mss = mss;
if (i == nsegs - 1)
break;
BGE_INC(idx, BGE_TX_RING_CNT);
}
}
/* Mark the last segment as end of packet... */