From ffdc2d9e1afd20e9f9d205115661481e984542d6 Mon Sep 17 00:00:00 2001 From: Matthew Wilcox Date: Tue, 28 Nov 2017 12:05:54 -0500 Subject: cls_u32: Reinstate cyclic allocation Commit e7614370d6f0 ("net_sched: use idr to allocate u32 filter handles) converted htid allocation to use the IDR. The ID allocated by this scheme changes; it used to be cyclic, but now always allocates the lowest available. The IDR supports cyclic allocation, so just use the right function. Signed-off-by: Matthew Wilcox --- net/sched/cls_u32.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c index 5b256da985b1..d2805f24ddd3 100644 --- a/net/sched/cls_u32.c +++ b/net/sched/cls_u32.c @@ -316,19 +316,13 @@ static void *u32_get(struct tcf_proto *tp, u32 handle) return u32_lookup_key(ht, handle); } +/* Protected by rtnl lock */ static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr) { - unsigned long idr_index; - int err; - - /* This is only used inside rtnl lock it is safe to increment - * without read _copy_ update semantics - */ - err = idr_alloc_ext(&tp_c->handle_idr, ptr, &idr_index, - 1, 0x7FF, GFP_KERNEL); - if (err) + int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL); + if (id < 0) return 0; - return (u32)(idr_index | 0x800) << 20; + return (id | 0x800U) << 20; } static struct hlist_head *tc_u_common_hash; -- cgit