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>
diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index e23e309..72db27e 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -444,6 +444,7 @@
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 @@
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 @@
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 @@
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 @@
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);