forked from Minki/linux
Automatic merge of /spare/repo/netdev-2.6 branch ppp
This commit is contained in:
Jeff Garzik
commit
21035ffeb7
@ -1217,36 +1217,43 @@ ppp_push(struct ppp *ppp)
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*/
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static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
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{
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int nch, len, fragsize;
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int len, fragsize;
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int i, bits, hdrlen, mtu;
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int flen, fnb;
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int flen;
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int navail, nfree;
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int nbigger;
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unsigned char *p, *q;
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struct list_head *list;
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struct channel *pch;
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struct sk_buff *frag;
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struct ppp_channel *chan;
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nch = 0;
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nfree = 0; /* # channels which have no packet already queued */
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navail = 0; /* total # of usable channels (not deregistered) */
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hdrlen = (ppp->flags & SC_MP_XSHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN;
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i = 0;
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list = &ppp->channels;
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while ((list = list->next) != &ppp->channels) {
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pch = list_entry(list, struct channel, clist);
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nch += pch->avail = (skb_queue_len(&pch->file.xq) == 0);
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/*
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* If a channel hasn't had a fragment yet, it has to get
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* one before we send any fragments on later channels.
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* If it can't take a fragment now, don't give any
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* to subsequent channels.
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*/
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if (!pch->had_frag && !pch->avail) {
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while ((list = list->next) != &ppp->channels) {
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pch = list_entry(list, struct channel, clist);
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pch->avail = 0;
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navail += pch->avail = (pch->chan != NULL);
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if (pch->avail) {
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if (skb_queue_len(&pch->file.xq) == 0
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|| !pch->had_frag) {
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pch->avail = 2;
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++nfree;
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}
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break;
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if (!pch->had_frag && i < ppp->nxchan)
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ppp->nxchan = i;
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}
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++i;
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}
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if (nch == 0)
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/*
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* Don't start sending this packet unless at least half of
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* the channels are free. This gives much better TCP
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* performance if we have a lot of channels.
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*/
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if (nfree == 0 || nfree < navail / 2)
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return 0; /* can't take now, leave it in xmit_pending */
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/* Do protocol field compression (XXX this should be optional) */
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@ -1257,14 +1264,19 @@ static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
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--len;
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}
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/* decide on fragment size */
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/*
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* Decide on fragment size.
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* We create a fragment for each free channel regardless of
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* how small they are (i.e. even 0 length) in order to minimize
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* the time that it will take to detect when a channel drops
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* a fragment.
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*/
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fragsize = len;
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if (nch > 1) {
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int maxch = ROUNDUP(len, MIN_FRAG_SIZE);
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if (nch > maxch)
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nch = maxch;
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fragsize = ROUNDUP(fragsize, nch);
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}
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if (nfree > 1)
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fragsize = ROUNDUP(fragsize, nfree);
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/* nbigger channels get fragsize bytes, the rest get fragsize-1,
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except if nbigger==0, then they all get fragsize. */
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nbigger = len % nfree;
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/* skip to the channel after the one we last used
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and start at that one */
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@ -1278,7 +1290,7 @@ static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
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/* create a fragment for each channel */
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bits = B;
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do {
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while (nfree > 0 || len > 0) {
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list = list->next;
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if (list == &ppp->channels) {
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i = 0;
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@ -1289,61 +1301,92 @@ static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
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if (!pch->avail)
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continue;
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/*
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* Skip this channel if it has a fragment pending already and
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* we haven't given a fragment to all of the free channels.
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*/
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if (pch->avail == 1) {
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if (nfree > 0)
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continue;
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} else {
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--nfree;
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pch->avail = 1;
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}
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/* check the channel's mtu and whether it is still attached. */
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spin_lock_bh(&pch->downl);
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if (pch->chan == 0 || (mtu = pch->chan->mtu) < hdrlen) {
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/* can't use this channel */
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if (pch->chan == NULL) {
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/* can't use this channel, it's being deregistered */
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spin_unlock_bh(&pch->downl);
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pch->avail = 0;
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if (--nch == 0)
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if (--navail == 0)
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break;
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continue;
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}
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/*
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* We have to create multiple fragments for this channel
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* if fragsize is greater than the channel's mtu.
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* Create a fragment for this channel of
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* min(max(mtu+2-hdrlen, 4), fragsize, len) bytes.
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* If mtu+2-hdrlen < 4, that is a ridiculously small
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* MTU, so we use mtu = 2 + hdrlen.
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*/
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if (fragsize > len)
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fragsize = len;
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for (flen = fragsize; flen > 0; flen -= fnb) {
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fnb = flen;
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if (fnb > mtu + 2 - hdrlen)
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fnb = mtu + 2 - hdrlen;
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if (fnb >= len)
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bits |= E;
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frag = alloc_skb(fnb + hdrlen, GFP_ATOMIC);
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if (frag == 0)
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goto noskb;
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q = skb_put(frag, fnb + hdrlen);
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/* make the MP header */
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q[0] = PPP_MP >> 8;
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q[1] = PPP_MP;
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if (ppp->flags & SC_MP_XSHORTSEQ) {
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q[2] = bits + ((ppp->nxseq >> 8) & 0xf);
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q[3] = ppp->nxseq;
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} else {
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q[2] = bits;
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q[3] = ppp->nxseq >> 16;
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q[4] = ppp->nxseq >> 8;
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q[5] = ppp->nxseq;
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}
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flen = fragsize;
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mtu = pch->chan->mtu + 2 - hdrlen;
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if (mtu < 4)
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mtu = 4;
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if (flen > mtu)
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flen = mtu;
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if (flen == len && nfree == 0)
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bits |= E;
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frag = alloc_skb(flen + hdrlen + (flen == 0), GFP_ATOMIC);
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if (frag == 0)
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goto noskb;
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q = skb_put(frag, flen + hdrlen);
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/* copy the data in */
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memcpy(q + hdrlen, p, fnb);
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/* try to send it down the channel */
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chan = pch->chan;
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if (!chan->ops->start_xmit(chan, frag))
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skb_queue_tail(&pch->file.xq, frag);
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pch->had_frag = 1;
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p += fnb;
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len -= fnb;
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++ppp->nxseq;
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bits = 0;
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/* make the MP header */
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q[0] = PPP_MP >> 8;
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q[1] = PPP_MP;
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if (ppp->flags & SC_MP_XSHORTSEQ) {
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q[2] = bits + ((ppp->nxseq >> 8) & 0xf);
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q[3] = ppp->nxseq;
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} else {
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q[2] = bits;
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q[3] = ppp->nxseq >> 16;
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q[4] = ppp->nxseq >> 8;
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q[5] = ppp->nxseq;
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}
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/*
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* Copy the data in.
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* Unfortunately there is a bug in older versions of
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* the Linux PPP multilink reconstruction code where it
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* drops 0-length fragments. Therefore we make sure the
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* fragment has at least one byte of data. Any bytes
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* we add in this situation will end up as padding on the
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* end of the reconstructed packet.
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*/
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if (flen == 0)
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*skb_put(frag, 1) = 0;
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else
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memcpy(q + hdrlen, p, flen);
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/* try to send it down the channel */
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chan = pch->chan;
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if (skb_queue_len(&pch->file.xq)
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|| !chan->ops->start_xmit(chan, frag))
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skb_queue_tail(&pch->file.xq, frag);
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pch->had_frag = 1;
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p += flen;
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len -= flen;
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++ppp->nxseq;
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bits = 0;
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spin_unlock_bh(&pch->downl);
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} while (len > 0);
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if (--nbigger == 0 && fragsize > 0)
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--fragsize;
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}
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ppp->nxchan = i;
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return 1;
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@ -1422,7 +1465,7 @@ ppp_input(struct ppp_channel *chan, struct sk_buff *skb)
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kfree_skb(skb);
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return;
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}
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proto = PPP_PROTO(skb);
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read_lock_bh(&pch->upl);
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if (pch->ppp == 0 || proto >= 0xc000 || proto == PPP_CCPFRAG) {
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@ -1691,7 +1734,7 @@ ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
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struct list_head *l;
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int mphdrlen = (ppp->flags & SC_MP_SHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN;
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if (!pskb_may_pull(skb, mphdrlen + 1) || ppp->mrru == 0)
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if (!pskb_may_pull(skb, mphdrlen) || ppp->mrru == 0)
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goto err; /* no good, throw it away */
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/* Decode sequence number and begin/end bits */
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