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Fix to an error condition case, when an mbuf chain

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get's defragged due to a mapping failure the header
pointers will be invalidated and can result in a
TSO or other failure down the line. So, when the
remapping occurs force a retry thru the offload
calculation code. Thanks to Andrew Boyer for discovering
this and cooking up the fix!!
This commit is contained in:
Jack F Vogel 2011-04-01 20:24:51 +00:00
parent 05f2ecd1fa
commit 62d8da8c3a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=220254
1 changed files with 6 additions and 16 deletions
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22
sys/dev/e1000/if_em.c
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@ -1761,8 +1761,9 @@ em_xmit(struct tx_ring *txr, struct mbuf **m_headp)
u32 txd_upper, txd_lower, txd_used, txd_saved;
int ip_off, poff;
int nsegs, i, j, first, last = 0;
int error, do_tso, tso_desc = 0;
int error, do_tso, tso_desc = 0, remap = 1;
retry:
m_head = *m_headp;
txd_upper = txd_lower = txd_used = txd_saved = 0;
do_tso = ((m_head->m_pkthdr.csum_flags & CSUM_TSO) != 0);
@ -1900,7 +1901,7 @@ em_xmit(struct tx_ring *txr, struct mbuf **m_headp)
* All other errors, in particular EINVAL, are fatal and prevent the
* mbuf chain from ever going through. Drop it and report error.
*/
if (error == EFBIG) {
if (error == EFBIG && remap) {
struct mbuf *m;
m = m_defrag(*m_headp, M_DONTWAIT);
@ -1912,20 +1913,9 @@ em_xmit(struct tx_ring *txr, struct mbuf **m_headp)
}
*m_headp = m;
/* Try it again */
error = bus_dmamap_load_mbuf_sg(txr->txtag, map,
*m_headp, segs, &nsegs, BUS_DMA_NOWAIT);
if (error == ENOMEM) {
adapter->no_tx_dma_setup++;
return (error);
} else if (error != 0) {
adapter->no_tx_dma_setup++;
m_freem(*m_headp);
*m_headp = NULL;
return (error);
}
/* Try it again, but only once */
remap = 0;
goto retry;
} else if (error == ENOMEM) {
adapter->no_tx_dma_setup++;
return (error);