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Message-Id: <20190628103158.2446356-1-arnd@arndb.de>
Date: Fri, 28 Jun 2019 12:31:44 +0200
From: Arnd Bergmann <arnd@...db.de>
To: Aviad Krawczyk <aviad.krawczyk@...wei.com>,
"David S. Miller" <davem@...emloft.net>
Cc: Arnd Bergmann <arnd@...db.de>,
Xue Chaojing <xuechaojing@...wei.com>,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Zhao Chen <zhaochen6@...wei.com>,
Eric Dumazet <edumazet@...gle.com>,
dann frazier <dann.frazier@...onical.com>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] hinic: reduce rss_init stack usage
On 32-bit architectures, putting an array of 256 u32 values on the
stack uses more space than the warning limit:
drivers/net/ethernet/huawei/hinic/hinic_main.c: In function 'hinic_rss_init':
drivers/net/ethernet/huawei/hinic/hinic_main.c:286:1: error: the frame size of 1068 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
I considered changing the code to use u8 values here, since that's
all the hardware supports, but dynamically allocating the array is
a more isolated fix here.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
.../net/ethernet/huawei/hinic/hinic_main.c | 20 ++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/huawei/hinic/hinic_main.c b/drivers/net/ethernet/huawei/hinic/hinic_main.c
index 1b917543feac..ceb0e247f52d 100644
--- a/drivers/net/ethernet/huawei/hinic/hinic_main.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_main.c
@@ -256,37 +256,43 @@ static int hinic_configure_max_qnum(struct hinic_dev *nic_dev)
static int hinic_rss_init(struct hinic_dev *nic_dev)
{
- u32 indir_tbl[HINIC_RSS_INDIR_SIZE] = { 0 };
u8 default_rss_key[HINIC_RSS_KEY_SIZE];
u8 tmpl_idx = nic_dev->rss_tmpl_idx;
+ u32 *indir_tbl;
int err, i;
+ indir_tbl = kcalloc(HINIC_RSS_INDIR_SIZE, sizeof(u32), GFP_KERNEL);
+ if (!indir_tbl)
+ return -ENOMEM;
+
netdev_rss_key_fill(default_rss_key, sizeof(default_rss_key));
for (i = 0; i < HINIC_RSS_INDIR_SIZE; i++)
indir_tbl[i] = ethtool_rxfh_indir_default(i, nic_dev->num_rss);
err = hinic_rss_set_template_tbl(nic_dev, tmpl_idx, default_rss_key);
if (err)
- return err;
+ goto out;
err = hinic_rss_set_indir_tbl(nic_dev, tmpl_idx, indir_tbl);
if (err)
- return err;
+ goto out;
err = hinic_set_rss_type(nic_dev, tmpl_idx, nic_dev->rss_type);
if (err)
- return err;
+ goto out;
err = hinic_rss_set_hash_engine(nic_dev, tmpl_idx,
nic_dev->rss_hash_engine);
if (err)
- return err;
+ goto out;
err = hinic_rss_cfg(nic_dev, 1, tmpl_idx);
if (err)
- return err;
+ goto out;
- return 0;
+out:
+ kfree(indir_tbl);
+ return err;
}
static void hinic_rss_deinit(struct hinic_dev *nic_dev)
--
2.20.0
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