diff options
| -rw-r--r-- | net/sched/sch_fq.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c index 4c060134c736..bc9ca1ba507b 100644 --- a/net/sched/sch_fq.c +++ b/net/sched/sch_fq.c @@ -70,14 +70,14 @@ struct fq_flow { struct sk_buff *head; /* list of skbs for this flow : first skb */ union { struct sk_buff *tail; /* last skb in the list */ - unsigned long age; /* jiffies when flow was emptied, for gc */ + unsigned long age; /* (jiffies | 1UL) when flow was emptied, for gc */ }; struct rb_node fq_node; /* anchor in fq_root[] trees */ struct sock *sk; int qlen; /* number of packets in flow queue */ int credit; u32 socket_hash; /* sk_hash */ - struct fq_flow *next; /* next pointer in RR lists, or &detached */ + struct fq_flow *next; /* next pointer in RR lists */ struct rb_node rate_node; /* anchor in q->delayed tree */ u64 time_next_packet; @@ -126,20 +126,25 @@ struct fq_sched_data { struct qdisc_watchdog watchdog; }; -/* special value to mark a detached flow (not on old/new list) */ -static struct fq_flow detached, throttled; - +/* + * f->tail and f->age share the same location. + * We can use the low order bit to differentiate if this location points + * to a sk_buff or contains a jiffies value, if we force this value to be odd. + * This assumes f->tail low order bit must be 0 since alignof(struct sk_buff) >= 2 + */ static void fq_flow_set_detached(struct fq_flow *f) { - f->next = &detached; - f->age = jiffies; + f->age = jiffies | 1UL; } static bool fq_flow_is_detached(const struct fq_flow *f) { - return f->next == &detached; + return !!(f->age & 1UL); } +/* special value to mark a throttled flow (not on old/new list) */ +static struct fq_flow throttled; + static bool fq_flow_is_throttled(const struct fq_flow *f) { return f->next == &throttled; |