netdev - [PATCH 28/38] cls_bpf: Use XArray marks to accelerate re-offload

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Date:   Tue, 20 Aug 2019 15:32:49 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     netdev@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Subject: [PATCH 28/38] cls_bpf: Use XArray marks to accelerate re-offload

From: "Matthew Wilcox (Oracle)" <willy@...radead.org>

Propagate the skip_hw flag from the cls_bpf_prog structure into one of
the XArray mark bits which lets us skip examining the unwanted programs.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 net/sched/cls_bpf.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
index 295baabdc683..4dcab41b25b5 100644
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -33,6 +33,8 @@ struct cls_bpf_head {
 	struct rcu_head rcu;
 };
 
+#define HW_FILTER	XA_MARK_1
+
 struct cls_bpf_prog {
 	struct bpf_prog *filter;
 	struct tcf_result res;
@@ -505,6 +507,11 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
 		tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work);
 	}
 
+	if (!tc_skip_hw(prog->gen_flags))
+		xa_set_mark(&head->progs, prog->handle, HW_FILTER);
+	else if (oldprog)
+		xa_clear_mark(&head->progs, prog->handle, HW_FILTER);
+
 	*arg = prog;
 	return 0;
 
@@ -648,10 +655,7 @@ static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb
 	unsigned long handle;
 	int err;
 
-	xa_for_each(&head->progs, handle, prog) {
-		if (tc_skip_hw(prog->gen_flags))
-			continue;
-
+	xa_for_each_marked(&head->progs, handle, prog, HW_FILTER) {
 		tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags,
 					   extack);
 		cls_bpf.command = TC_CLSBPF_OFFLOAD;
-- 
2.23.0.rc1