Yony Yossef wrote:
Hi freebsd-net,I'm seeing mbuf chains larger than 64K being sent down by FreeBSD 7 when TSO is enabled. Then my driver crashes in bus_dmamap_load_mbuf_sg (error=EINVAL). I'm printing the mbuf m_pkthdr.len size right after the DEQUEUE from the stack: IFQ_DRV_DEQUEUE(&dev->if_snd, m_head); if (m_head == NULL) break; if (m_head->m_pkthdr.len > 65000) { printf("TSO packet mbuf len:%d\n", m_head->m_pkthdr.len); } and the output is: .... TSO packet mbuf len:65387 TSO packet mbuf len:65417 TSO packet mbuf len:65447 TSO packet mbuf len:65477 TSO packet mbuf len:65507 TSO packet mbuf len:65537 mtnic0: bus_dmamap_load_mbuf_sg error: 22 xmit_failure:12 ... Note the 65537, I've also seen TSO packets sized 65542. There's this old thread talking about it: http://unix.derkeiler.com/Mailing-Lists/FreeBSD/net/2007-02/msg00312.html but I've seen no solution for this bug. Is there a fix for that?
This bug is supposed to be fixed and the fix should also be included in 7.0. The other users of TSO reported no more overflows. I'll have another look whether later changes may have had an effect. -- Andre _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
