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net: sk_buff rbnode reorg

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skb->rbnode shares space with skb->next, skb->prev and skb->tstamp

Current uses (TCP receive ofo queue and netem) need to save/restore
tstamp, while skb->dev is either NULL (TCP) or a constant for a given
queue (netem).

Since we plan using an RB tree for TCP retransmit queue to speedup SACK
processing with large BDP, this patch exchanges skb->dev and
skb->tstamp.

This saves some overhead in both TCP and netem.

v2: removes the swtstamp field from struct tcp_skb_cb

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
Cc: Wei Wang <weiwan@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2017-09-19 05:14:24 -07:00
committed by David S. Miller
parent a38b2fa37e
commit bffa72cf7f
4 changed files with 17 additions and 39 deletions
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16
include/linux/skbuff.h
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@@ -661,8 +661,12 @@ struct sk_buff {
struct sk_buff *prev;
union {
ktime_t tstamp;
u64 skb_mstamp;
struct net_device *dev;
/* Some protocols might use this space to store information,
* while device pointer would be NULL.
* UDP receive path is one user.
*/
unsigned long dev_scratch;
};
};
struct rb_node rbnode; /* used in netem & tcp stack */
@@ -670,12 +674,8 @@ struct sk_buff {
struct sock *sk;
union {
struct net_device *dev;
/* Some protocols might use this space to store information,
* while device pointer would be NULL.
* UDP receive path is one user.
*/
unsigned long dev_scratch;
ktime_t tstamp;
u64 skb_mstamp;
};
/*
* This is the control buffer. It is free to use for every