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Automatic merge of /spare/repo/netdev-2.6 branch ppp

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2005-06-04 17:03:55 -04:00 • committed by Jeff Garzik
commit 21035ffeb7
1 changed files with 109 additions and 66 deletions
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173
drivers/net/ppp_generic.c
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@ -1217,36 +1217,43 @@ ppp_push(struct ppp *ppp)
*/ */
static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb) static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
{ {
int nch, len, fragsize; int len, fragsize;
int i, bits, hdrlen, mtu; int i, bits, hdrlen, mtu;
int flen, fnb; int flen;
int navail, nfree;
int nbigger;
unsigned char *p, *q; unsigned char *p, *q;
struct list_head *list; struct list_head *list;
struct channel *pch; struct channel *pch;
struct sk_buff *frag; struct sk_buff *frag;
struct ppp_channel *chan; struct ppp_channel *chan;
nch = 0; nfree = 0; /* # channels which have no packet already queued */
navail = 0; /* total # of usable channels (not deregistered) */
hdrlen = (ppp->flags & SC_MP_XSHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; hdrlen = (ppp->flags & SC_MP_XSHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN;
i = 0;
list = &ppp->channels; list = &ppp->channels;
while ((list = list->next) != &ppp->channels) { while ((list = list->next) != &ppp->channels) {
pch = list_entry(list, struct channel, clist); pch = list_entry(list, struct channel, clist);
nch += pch->avail = (skb_queue_len(&pch->file.xq) == 0); navail += pch->avail = (pch->chan != NULL);
/* if (pch->avail) {
* If a channel hasn't had a fragment yet, it has to get if (skb_queue_len(&pch->file.xq) == 0
* one before we send any fragments on later channels. || !pch->had_frag) {
* If it can't take a fragment now, don't give any pch->avail = 2;
* to subsequent channels. ++nfree;
*/
if (!pch->had_frag && !pch->avail) {
while ((list = list->next) != &ppp->channels) {
pch = list_entry(list, struct channel, clist);
pch->avail = 0;
} }
break; if (!pch->had_frag && i < ppp->nxchan)
ppp->nxchan = i;
} }
++i;
} }
if (nch == 0)
/*
* Don't start sending this packet unless at least half of
* the channels are free. This gives much better TCP
* performance if we have a lot of channels.
*/
if (nfree == 0 || nfree < navail / 2)
return 0; /* can't take now, leave it in xmit_pending */ return 0; /* can't take now, leave it in xmit_pending */
/* Do protocol field compression (XXX this should be optional) */ /* Do protocol field compression (XXX this should be optional) */
@ -1257,14 +1264,19 @@ static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
--len; --len;
} }
/* decide on fragment size */ /*
* Decide on fragment size.
* We create a fragment for each free channel regardless of
* how small they are (i.e. even 0 length) in order to minimize
* the time that it will take to detect when a channel drops
* a fragment.
*/
fragsize = len; fragsize = len;
if (nch > 1) { if (nfree > 1)
int maxch = ROUNDUP(len, MIN_FRAG_SIZE); fragsize = ROUNDUP(fragsize, nfree);
if (nch > maxch) /* nbigger channels get fragsize bytes, the rest get fragsize-1,
nch = maxch; except if nbigger==0, then they all get fragsize. */
fragsize = ROUNDUP(fragsize, nch); nbigger = len % nfree;
}
/* skip to the channel after the one we last used /* skip to the channel after the one we last used
and start at that one */ and start at that one */
@ -1278,7 +1290,7 @@ static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
/* create a fragment for each channel */ /* create a fragment for each channel */
bits = B; bits = B;
do { while (nfree > 0 || len > 0) {
list = list->next; list = list->next;
if (list == &ppp->channels) { if (list == &ppp->channels) {
i = 0; i = 0;
@ -1289,61 +1301,92 @@ static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
if (!pch->avail) if (!pch->avail)
continue; continue;
/*
* Skip this channel if it has a fragment pending already and
* we haven't given a fragment to all of the free channels.
*/
if (pch->avail == 1) {
if (nfree > 0)
continue;
} else {
--nfree;
pch->avail = 1;
}
/* check the channel's mtu and whether it is still attached. */ /* check the channel's mtu and whether it is still attached. */
spin_lock_bh(&pch->downl); spin_lock_bh(&pch->downl);
if (pch->chan == 0 || (mtu = pch->chan->mtu) < hdrlen) { if (pch->chan == NULL) {
/* can't use this channel */ /* can't use this channel, it's being deregistered */
spin_unlock_bh(&pch->downl); spin_unlock_bh(&pch->downl);
pch->avail = 0; pch->avail = 0;
if (--nch == 0) if (--navail == 0)
break; break;
continue; continue;
} }
/* /*
* We have to create multiple fragments for this channel * Create a fragment for this channel of
* if fragsize is greater than the channel's mtu. * min(max(mtu+2-hdrlen, 4), fragsize, len) bytes.
* If mtu+2-hdrlen < 4, that is a ridiculously small
* MTU, so we use mtu = 2 + hdrlen.
*/ */
if (fragsize > len) if (fragsize > len)
fragsize = len; fragsize = len;
for (flen = fragsize; flen > 0; flen -= fnb) { flen = fragsize;
fnb = flen; mtu = pch->chan->mtu + 2 - hdrlen;
if (fnb > mtu + 2 - hdrlen) if (mtu < 4)
fnb = mtu + 2 - hdrlen; mtu = 4;
if (fnb >= len) if (flen > mtu)
bits |= E; flen = mtu;
frag = alloc_skb(fnb + hdrlen, GFP_ATOMIC); if (flen == len && nfree == 0)
if (frag == 0) bits |= E;
goto noskb; frag = alloc_skb(flen + hdrlen + (flen == 0), GFP_ATOMIC);
q = skb_put(frag, fnb + hdrlen); if (frag == 0)
/* make the MP header */ goto noskb;
q[0] = PPP_MP >> 8; q = skb_put(frag, flen + hdrlen);
q[1] = PPP_MP;
if (ppp->flags & SC_MP_XSHORTSEQ) {
q[2] = bits + ((ppp->nxseq >> 8) & 0xf);
q[3] = ppp->nxseq;
} else {
q[2] = bits;
q[3] = ppp->nxseq >> 16;
q[4] = ppp->nxseq >> 8;
q[5] = ppp->nxseq;
}
/* copy the data in */ /* make the MP header */
memcpy(q + hdrlen, p, fnb); q[0] = PPP_MP >> 8;
q[1] = PPP_MP;
/* try to send it down the channel */ if (ppp->flags & SC_MP_XSHORTSEQ) {
chan = pch->chan; q[2] = bits + ((ppp->nxseq >> 8) & 0xf);
if (!chan->ops->start_xmit(chan, frag)) q[3] = ppp->nxseq;
skb_queue_tail(&pch->file.xq, frag); } else {
pch->had_frag = 1; q[2] = bits;
p += fnb; q[3] = ppp->nxseq >> 16;
len -= fnb; q[4] = ppp->nxseq >> 8;
++ppp->nxseq; q[5] = ppp->nxseq;
bits = 0;
} }
/*
* Copy the data in.
* Unfortunately there is a bug in older versions of
* the Linux PPP multilink reconstruction code where it
* drops 0-length fragments. Therefore we make sure the
* fragment has at least one byte of data. Any bytes
* we add in this situation will end up as padding on the
* end of the reconstructed packet.
*/
if (flen == 0)
*skb_put(frag, 1) = 0;
else
memcpy(q + hdrlen, p, flen);
/* try to send it down the channel */
chan = pch->chan;
if (skb_queue_len(&pch->file.xq)
|| !chan->ops->start_xmit(chan, frag))
skb_queue_tail(&pch->file.xq, frag);
pch->had_frag = 1;
p += flen;
len -= flen;
++ppp->nxseq;
bits = 0;
spin_unlock_bh(&pch->downl); spin_unlock_bh(&pch->downl);
} while (len > 0);
if (--nbigger == 0 && fragsize > 0)
--fragsize;
}
ppp->nxchan = i; ppp->nxchan = i;
return 1; return 1;
@ -1691,7 +1734,7 @@ ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
struct list_head *l; struct list_head *l;
int mphdrlen = (ppp->flags & SC_MP_SHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; int mphdrlen = (ppp->flags & SC_MP_SHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN;
if (!pskb_may_pull(skb, mphdrlen + 1) || ppp->mrru == 0) if (!pskb_may_pull(skb, mphdrlen) || ppp->mrru == 0)
goto err; /* no good, throw it away */ goto err; /* no good, throw it away */
/* Decode sequence number and begin/end bits */ /* Decode sequence number and begin/end bits */