net: simplify flags for tx timestamping
This patch removes the abstraction introduced by the union skb_shared_tx in
the shared skb data.
The access of the different union elements at several places led to some
confusion about accessing the shared tx_flags e.g. in skb_orphan_try().
http://marc.info/?l=linux-netdev&m=128084897415886&w=2
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index d805038..f067c95 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -163,26 +163,19 @@
ktime_t syststamp;
};
-/**
- * struct skb_shared_tx - instructions for time stamping of outgoing packets
- * @hardware: generate hardware time stamp
- * @software: generate software time stamp
- * @in_progress: device driver is going to provide
- * hardware time stamp
- * @prevent_sk_orphan: make sk reference available on driver level
- * @flags: all shared_tx flags
- *
- * These flags are attached to packets as part of the
- * &skb_shared_info. Use skb_tx() to get a pointer.
- */
-union skb_shared_tx {
- struct {
- __u8 hardware:1,
- software:1,
- in_progress:1,
- prevent_sk_orphan:1;
- };
- __u8 flags;
+/* Definitions for tx_flags in struct skb_shared_info */
+enum {
+ /* generate hardware time stamp */
+ SKBTX_HW_TSTAMP = 1 << 0,
+
+ /* generate software time stamp */
+ SKBTX_SW_TSTAMP = 1 << 1,
+
+ /* device driver is going to provide hardware time stamp */
+ SKBTX_IN_PROGRESS = 1 << 2,
+
+ /* ensure the originating sk reference is available on driver level */
+ SKBTX_DRV_NEEDS_SK_REF = 1 << 3,
};
/* This data is invariant across clones and lives at
@@ -195,7 +188,7 @@
unsigned short gso_segs;
unsigned short gso_type;
__be32 ip6_frag_id;
- union skb_shared_tx tx_flags;
+ __u8 tx_flags;
struct sk_buff *frag_list;
struct skb_shared_hwtstamps hwtstamps;
@@ -587,11 +580,6 @@
return &skb_shinfo(skb)->hwtstamps;
}
-static inline union skb_shared_tx *skb_tx(struct sk_buff *skb)
-{
- return &skb_shinfo(skb)->tx_flags;
-}
-
/**
* skb_queue_empty - check if a queue is empty
* @list: queue head
@@ -1996,8 +1984,8 @@
static inline void sw_tx_timestamp(struct sk_buff *skb)
{
- union skb_shared_tx *shtx = skb_tx(skb);
- if (shtx->software && !shtx->in_progress)
+ if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP &&
+ !(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
skb_tstamp_tx(skb, NULL);
}