linux-kernel - [PATCH 5.10 111/252] netfilter: flowtable: Remove redundant hw refresh bit

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Date:   Mon, 31 May 2021 15:12:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Roi Dayan <roid@...dia.com>,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 5.10 111/252] netfilter: flowtable: Remove redundant hw refresh bit

From: Roi Dayan <roid@...dia.com>

commit c07531c01d8284aedaf95708ea90e76d11af0e21 upstream.

Offloading conns could fail for multiple reasons and a hw refresh bit is
set to try to reoffload it in next sw packet.
But it could be in some cases and future points that the hw refresh bit
is not set but a refresh could succeed.
Remove the hw refresh bit and do offload refresh if requested.
There won't be a new work entry if a work is already pending
anyway as there is the hw pending bit.

Fixes: 8b3646d6e0c4 ("net/sched: act_ct: Support refreshing the flow table entries")
Signed-off-by: Roi Dayan <roid@...dia.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/net/netfilter/nf_flow_table.h |    1 -
 net/netfilter/nf_flow_table_core.c    |    3 +--
 net/netfilter/nf_flow_table_offload.c |    7 ++++---
 3 files changed, 5 insertions(+), 6 deletions(-)

--- a/include/net/netfilter/nf_flow_table.h
+++ b/include/net/netfilter/nf_flow_table.h
@@ -126,7 +126,6 @@ enum nf_flow_flags {
 	NF_FLOW_HW,
 	NF_FLOW_HW_DYING,
 	NF_FLOW_HW_DEAD,
-	NF_FLOW_HW_REFRESH,
 	NF_FLOW_HW_PENDING,
 };
 
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -259,8 +259,7 @@ void flow_offload_refresh(struct nf_flow
 {
 	flow->timeout = nf_flowtable_time_stamp + NF_FLOW_TIMEOUT;
 
-	if (likely(!nf_flowtable_hw_offload(flow_table) ||
-		   !test_and_clear_bit(NF_FLOW_HW_REFRESH, &flow->flags)))
+	if (likely(!nf_flowtable_hw_offload(flow_table)))
 		return;
 
 	nf_flow_offload_add(flow_table, flow);
--- a/net/netfilter/nf_flow_table_offload.c
+++ b/net/netfilter/nf_flow_table_offload.c
@@ -753,10 +753,11 @@ static void flow_offload_work_add(struct
 
 	err = flow_offload_rule_add(offload, flow_rule);
 	if (err < 0)
-		set_bit(NF_FLOW_HW_REFRESH, &offload->flow->flags);
-	else
-		set_bit(IPS_HW_OFFLOAD_BIT, &offload->flow->ct->status);
+		goto out;
 
+	set_bit(IPS_HW_OFFLOAD_BIT, &offload->flow->ct->status);
+
+out:
 	nf_flow_offload_destroy(flow_rule);
 }