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Fix net80211 fragment creation.

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When creating fragment frames, the header length should honour the
DATAPAD flag.

This fixes the fragments that are queued to the ath(4) driver but it
doesn't yet fix fragment transmission.  That requires further changes
to the ath(4) transmit path.  Well, strictly speaking, it requires
further changes to _all_ wifi driver transmit paths, but this is at least
a start.

Tested:

* AR5416, STA mode, w/ fragthreshold set to 256.
This commit is contained in:
Adrian Chadd 2013-05-25 06:28:30 +00:00
parent 2360cb0eea
commit 8d46c25d23
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=250974
1 changed files with 15 additions and 4 deletions
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19
sys/net80211/ieee80211_output.c
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@ -1495,18 +1495,28 @@ static int
ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0,
u_int hdrsize, u_int ciphdrsize, u_int mtu)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_frame *wh, *whf;
struct mbuf *m, *prev, *next;
u_int totalhdrsize, fragno, fragsize, off, remainder, payload;
u_int hdrspace;
KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?"));
KASSERT(m0->m_pkthdr.len > mtu,
("pktlen %u mtu %u", m0->m_pkthdr.len, mtu));
/*
* Honor driver DATAPAD requirement.
*/
if (ic->ic_flags & IEEE80211_F_DATAPAD)
hdrspace = roundup(hdrsize, sizeof(uint32_t));
else
hdrspace = hdrsize;
wh = mtod(m0, struct ieee80211_frame *);
/* NB: mark the first frag; it will be propagated below */
wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG;
totalhdrsize = hdrsize + ciphdrsize;
totalhdrsize = hdrspace + ciphdrsize;
fragno = 1;
off = mtu - ciphdrsize;
remainder = m0->m_pkthdr.len - off;
@ -1553,9 +1563,10 @@ ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0,
payload = fragsize - totalhdrsize;
/* NB: destination is known to be contiguous */
m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize);
m->m_len = hdrsize + payload;
m->m_pkthdr.len = hdrsize + payload;
m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrspace);
m->m_len = hdrspace + payload;
m->m_pkthdr.len = hdrspace + payload;
m->m_flags |= M_FRAG;
/* chain up the fragment */