diff options
| author | Rémi Denis-Courmont <remi.denis-courmont@nokia.com> | 2010-01-04 02:02:48 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-01-07 00:24:55 -0800 |
| commit | fea93ecef619b5779ca6984568517b1685079b05 (patch) | |
| tree | 9894ba0ea3f8f4a1191697fecb0f63a45767a90f /net/phonet/pep.c | |
| parent | fc6a110754476362f9f4fa3199a637f2331c5993 (diff) | |
| download | lwn-fea93ecef619b5779ca6984568517b1685079b05.tar.gz lwn-fea93ecef619b5779ca6984568517b1685079b05.zip | |
Phonet: zero-copy GPRS TX
Send aligned pipe payload if requested to do so. Then, the socket buffer
needs not be fragmented anymore.
Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/phonet/pep.c')
| -rw-r--r-- | net/phonet/pep.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/net/phonet/pep.c b/net/phonet/pep.c index e23e30907d34..72db27e3fc06 100644 --- a/net/phonet/pep.c +++ b/net/phonet/pep.c @@ -444,6 +444,7 @@ static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb) struct sockaddr_pn dst; u16 peer_type; u8 pipe_handle, enabled, n_sb; + u8 aligned = 0; if (!pskb_pull(skb, sizeof(*hdr) + 4)) return -EINVAL; @@ -482,6 +483,9 @@ static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb) return -EINVAL; peer_type = (peer_type & 0xff00) | data[0]; break; + case PN_PIPE_SB_ALIGNED_DATA: + aligned = data[0] != 0; + break; } n_sb--; } @@ -513,6 +517,7 @@ static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb) newpn->rx_credits = 0; newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL; newpn->init_enable = enabled; + newpn->aligned = aligned; BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue)); skb_queue_head(&newsk->sk_receive_queue, skb); @@ -832,11 +837,15 @@ static int pipe_skb_send(struct sock *sk, struct sk_buff *skb) return -ENOBUFS; } - skb_push(skb, 3); + skb_push(skb, 3 + pn->aligned); skb_reset_transport_header(skb); ph = pnp_hdr(skb); ph->utid = 0; - ph->message_id = PNS_PIPE_DATA; + if (pn->aligned) { + ph->message_id = PNS_PIPE_ALIGNED_DATA; + ph->data[0] = 0; /* padding */ + } else + ph->message_id = PNS_PIPE_DATA; ph->pipe_handle = pn->pipe_handle; return pn_skb_send(sk, skb, &pipe_srv); @@ -930,6 +939,9 @@ int pep_write(struct sock *sk, struct sk_buff *skb) struct sk_buff *rskb, *fs; int flen = 0; + if (pep_sk(sk)->aligned) + return pipe_skb_send(sk, skb); + rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC); if (!rskb) { kfree_skb(skb); |