linux-kernel - [RFC V3 PATCH 24/26] net/netpolicy: optimize for queue pair

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Date:   Mon, 12 Sep 2016 07:55:57 -0700
From:   kan.liang@...el.com
To:     davem@...emloft.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     jeffrey.t.kirsher@...el.com, mingo@...hat.com,
        peterz@...radead.org, kuznet@....inr.ac.ru, jmorris@...ei.org,
        yoshfuji@...ux-ipv6.org, kaber@...sh.net,
        akpm@...ux-foundation.org, keescook@...omium.org,
        viro@...iv.linux.org.uk, gorcunov@...nvz.org,
        john.stultz@...aro.org, aduyck@...antis.com, ben@...adent.org.uk,
        decot@...glers.com, fw@...len.de, alexander.duyck@...il.com,
        daniel@...earbox.net, tom@...bertland.com, rdunlap@...radead.org,
        xiyou.wangcong@...il.com, hannes@...essinduktion.org,
        stephen@...workplumber.org, alexei.starovoitov@...il.com,
        jesse.brandeburg@...el.com, andi@...stfloor.org,
        Kan Liang <kan.liang@...el.com>
Subject: [RFC V3 PATCH 24/26] net/netpolicy: optimize for queue pair

From: Kan Liang <kan.liang@...el.com>

Some drivers like i40e driver does not support separate Tx and Rx queues
as channels. Using Rx queue to stand for the channels, if queue_pair is
set by driver.

Signed-off-by: Kan Liang <kan.liang@...el.com>
---
 include/linux/netpolicy.h | 1 +
 net/core/netpolicy.c      | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/include/linux/netpolicy.h b/include/linux/netpolicy.h
index 88f4f60..9b03b4d 100644
--- a/include/linux/netpolicy.h
+++ b/include/linux/netpolicy.h
@@ -83,6 +83,7 @@ struct netpolicy_info {
 	unsigned long avail_policy[BITS_TO_LONGS(NET_POLICY_MAX)];
 	bool irq_affinity;
 	bool has_mix_policy;
+	bool queue_pair;
 	/* cpu and queue mapping information */
 	struct netpolicy_sys_info	sys_info;
 	/* List of policy objects 0 rx 1 tx */
diff --git a/net/core/netpolicy.c b/net/core/netpolicy.c
index 2f55a14..84503a4 100644
--- a/net/core/netpolicy.c
+++ b/net/core/netpolicy.c
@@ -538,6 +538,9 @@ int netpolicy_pick_queue(struct netpolicy_instance *instance, bool is_rx)
 	if (!policy_validate(instance))
 		return -EINVAL;
 
+	if (dev->netpolicy->queue_pair)
+		is_rx = true;
+
 	/* fast path */
 	rcu_read_lock();
 	version = rcu_dereference(dev->netpolicy->sys_info.version)->major;
-- 
2.5.5