linux-kernel - [PATCH net 1/6] net: hns3: add option to turn off page pool feature

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Date:   Mon, 13 Sep 2021 21:08:20 +0800
From:   Guangbin Huang <huangguangbin2@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <lipeng321@...wei.com>, <huangguangbin2@...wei.com>
Subject: [PATCH net 1/6] net: hns3: add option to turn off page pool feature

From: Yunsheng Lin <linyunsheng@...wei.com>

When page pool is added to the hns3 driver, it is always
enabled unconditionally, which means spilt page handling
in the hns3 driver is dead code.

As there is a requirement to test the performance between
spilt page handling in driver and page pool, so add a module
param to support disabling the page pool.

When the page pool is proved to perform better in most case,
the spilt page handling in driver can be removed.

Fixes: 93188e9642c3 ("net: hns3: support skb's frag page recycling based on page pool")
Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@...wei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 22af3d6ce178..293243bbe407 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -61,6 +61,9 @@ static unsigned int tx_sgl = 1;
 module_param(tx_sgl, uint, 0600);
 MODULE_PARM_DESC(tx_sgl, "Minimum number of frags when using dma_map_sg() to optimize the IOMMU mapping");
 
+static bool page_pool_enabled = true;
+module_param(page_pool_enabled, bool, 0400);
+
 #define HNS3_SGL_SIZE(nfrag)	(sizeof(struct scatterlist) * (nfrag) +	\
 				 sizeof(struct sg_table))
 #define HNS3_MAX_SGL_SIZE	ALIGN(HNS3_SGL_SIZE(HNS3_MAX_TSO_BD_NUM), \
@@ -4753,7 +4756,8 @@ static int hns3_alloc_ring_memory(struct hns3_enet_ring *ring)
 		goto out_with_desc_cb;
 
 	if (!HNAE3_IS_TX_RING(ring)) {
-		hns3_alloc_page_pool(ring);
+		if (page_pool_enabled)
+			hns3_alloc_page_pool(ring);
 
 		ret = hns3_alloc_ring_buffers(ring);
 		if (ret)
-- 
2.33.0