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Back out rev. 1.152 as it was breaking vlan tag insertion when vlan tag

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stripping was disabled due to being in promisc mode.  This is a hardware
bug.  Update comment to explicitly state the reason the manual vlan tag
insertion in this case.  See rev. 1.53 for further information as well.

Noticed by:	jhb
This commit is contained in:
Andre Oppermann 2006-09-29 21:38:12 +00:00
parent c4baa2453c
commit 1038b3fbdc
1 changed files with 39 additions and 0 deletions
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39
sys/dev/em/if_em.c
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@ -1474,6 +1474,45 @@ em_encap(struct adapter *adapter, struct mbuf **m_headp)
}
}
/*
* When operating in promiscuous mode, hardware stripping of the
* VLAN tag on receive is disabled. This should not prevent us
* from doing hardware insertion of the VLAN tag here as that
* is controlled by the dma descriptor flags and not the receive
* tag strip setting. Unfortunatly this hardware switches the
* VLAN encapsulation type from 802.1q to ISL when stripping om
* receive is disabled. This means we have to add the vlan
* encapsulation here in the driver, since it will have come down
* from the VLAN layer with a tag instead of a VLAN header.
*/
if ((m_head->m_flags & M_VLANTAG) && adapter->em_insert_vlan_header) {
struct ether_vlan_header *evl;
struct ether_header eh;
m_head = m_pullup(m_head, sizeof(eh));
if (m_head == NULL) {
*m_headp = NULL;
return (ENOBUFS);
}
eh = *mtod(m_head, struct ether_header *);
M_PREPEND(m_head, sizeof(*evl), M_DONTWAIT);
if (m_head == NULL) {
*m_headp = NULL;
return (ENOBUFS);
}
m_head = m_pullup(m_head, sizeof(*evl));
if (m_head == NULL) {
*m_headp = NULL;
return (ENOBUFS);
}
evl = mtod(m_head, struct ether_vlan_header *);
bcopy(&eh, evl, sizeof(*evl));
evl->evl_proto = evl->evl_encap_proto;
evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
evl->evl_tag = htons(m_head->m_pkthdr.ether_vtag);
*m_headp = m_head;
}
/*
* TSO workaround:
* If an mbuf contains only the IP and TCP header we have