@@ -3493,6 +3493,10 @@ ppp_connect_channel(struct channel *pch, int unit)
ret = -ENOTCONN;
goto outl;
}
+ if (pch->chan->direct_xmit)
+ ppp->dev->priv_flags |= IFF_NO_QUEUE;
+ else
+ ppp->dev->priv_flags &= ~IFF_NO_QUEUE;
spin_unlock_bh(&pch->downl);
if (pch->file.hdrlen > ppp->file.hdrlen)
ppp->file.hdrlen = pch->file.hdrlen;
@@ -693,6 +693,7 @@ static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr,
po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr) - 2;
po->chan.private = sk;
po->chan.ops = &pppoe_chan_ops;
+ po->chan.direct_xmit = true;
error = ppp_register_net_channel(dev_net(dev), &po->chan);
if (error) {
@@ -465,6 +465,7 @@ static int pptp_connect(struct socket *sock, struct sockaddr *uservaddr,
po->chan.mtu -= PPTP_HEADER_OVERHEAD;
po->chan.hdrlen = 2 + sizeof(struct pptp_gre_header);
+ po->chan.direct_xmit = true;
error = ppp_register_channel(&po->chan);
if (error) {
pr_err("PPTP: failed to register PPP channel (%d)\n", error);
@@ -42,8 +42,7 @@ struct ppp_channel {
int hdrlen; /* amount of headroom channel needs */
void *ppp; /* opaque to channel */
int speed; /* transfer rate (bytes/second) */
- /* the following is not used at present */
- int latency; /* overhead time in milliseconds */
+ bool direct_xmit; /* no qdisc, xmit directly */
};
#ifdef __KERNEL__
@@ -806,6 +806,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
po->chan.private = sk;
po->chan.ops = &pppol2tp_chan_ops;
po->chan.mtu = pppol2tp_tunnel_mtu(tunnel);
+ po->chan.direct_xmit = true;
error = ppp_register_net_channel(sock_net(sk), &po->chan);
if (error) {
For PPPoE, PPTP, and PPPoL2TP, the start_xmit() function directly forwards packets to the underlying network stack and never returns anything other than 1. So these interfaces do not require a qdisc, and the IFF_NO_QUEUE flag should be set. Introduces a direct_xmit flag in struct ppp_channel to indicate when IFF_NO_QUEUE should be applied. The flag is set in ppp_connect_channel() for relevant protocols. While at it, remove the usused latency member from struct ppp_channel. Signed-off-by: Qingfang Deng <dqfext@gmail.com> --- RFC v3 -> v1: drop RFC, and remove the unused member drivers/net/ppp/ppp_generic.c | 4 ++++ drivers/net/ppp/pppoe.c | 1 + drivers/net/ppp/pptp.c | 1 + include/linux/ppp_channel.h | 3 +-- net/l2tp/l2tp_ppp.c | 1 + 5 files changed, 8 insertions(+), 2 deletions(-)