AuxXxilium/linux_dsm_epyc7002
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netback: set transport header before passing it to kernel

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Currently, for the packets receives from netback, before doing header check,
kernel just reset the transport header in netif_receive_skb() which pretends non
l4 header. This is suboptimal for precise packet length estimation (introduced
in 1def9238: net_sched: more precise pkt_len computation) which needs correct l4
header for gso packets.

The patch just reuse the header probed by netback for partial checksum packets
and tries to use skb_flow_dissect() for other cases, if both fail, just pretend
no l4 header.

Cc: Eric Dumazet <edumazet@google.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2013-03-25 20:19:58 +00:00 committed by David S. Miller
parent c1aad275b0
commit f9ca8f7439
1 changed files with 12 additions and 0 deletions
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12
drivers/net/xen-netback/netback.c
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@ -39,6 +39,7 @@
#include <linux/udp.h>
#include <net/tcp.h>
#include <net/flow_keys.h>
#include <xen/xen.h>
#include <xen/events.h>
@ -1184,6 +1185,7 @@ static int checksum_setup(struct xenvif *vif, struct sk_buff *skb)
if (th >= skb_tail_pointer(skb))
goto out;
skb_set_transport_header(skb, 4 * iph->ihl);
skb->csum_start = th - skb->head;
switch (iph->protocol) {
case IPPROTO_TCP:
@ -1495,6 +1497,7 @@ static void xen_netbk_tx_submit(struct xen_netbk *netbk)
skb->dev = vif->dev;
skb->protocol = eth_type_trans(skb, skb->dev);
skb_reset_network_header(skb);
if (checksum_setup(vif, skb)) {
netdev_dbg(vif->dev,
@ -1503,6 +1506,15 @@ static void xen_netbk_tx_submit(struct xen_netbk *netbk)
continue;
}
if (!skb_transport_header_was_set(skb)) {
struct flow_keys keys;
if (skb_flow_dissect(skb, &keys))
skb_set_transport_header(skb, keys.thoff);
else
skb_reset_transport_header(skb);
}
vif->dev->stats.rx_bytes += skb->len;
vif->dev->stats.rx_packets++;