netdev - [PATCH net-next v6 2/9] net: ethtool: add hds_config member in ethtool_netdev

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20241218144530.2963326-3-ap420073@gmail.com>
Date: Wed, 18 Dec 2024 14:45:23 +0000
From: Taehee Yoo <ap420073@...il.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	almasrymina@...gle.com,
	donald.hunter@...il.com,
	corbet@....net,
	michael.chan@...adcom.com,
	andrew+netdev@...n.ch,
	hawk@...nel.org,
	ilias.apalodimas@...aro.org,
	ast@...nel.org,
	daniel@...earbox.net,
	john.fastabend@...il.com,
	dw@...idwei.uk,
	sdf@...ichev.me,
	asml.silence@...il.com,
	brett.creeley@....com,
	linux-doc@...r.kernel.org,
	netdev@...r.kernel.org
Cc: kory.maincent@...tlin.com,
	maxime.chevallier@...tlin.com,
	danieller@...dia.com,
	hengqi@...ux.alibaba.com,
	ecree.xilinx@...il.com,
	przemyslaw.kitszel@...el.com,
	hkallweit1@...il.com,
	ahmed.zaki@...el.com,
	rrameshbabu@...dia.com,
	idosch@...dia.com,
	jiri@...nulli.us,
	bigeasy@...utronix.de,
	lorenzo@...nel.org,
	jdamato@...tly.com,
	aleksander.lobakin@...el.com,
	kaiyuanz@...gle.com,
	willemb@...gle.com,
	daniel.zahka@...il.com,
	ap420073@...il.com
Subject: [PATCH net-next v6 2/9] net: ethtool: add hds_config member in ethtool_netdev_state

When tcp-data-split is UNKNOWN mode, drivers arbitrarily handle it.
For example, bnxt_en driver automatically enables if at least one of
LRO/GRO/JUMBO is enabled.
If tcp-data-split is UNKNOWN and LRO is enabled, a driver returns
ENABLES of tcp-data-split, not UNKNOWN.
So, `ethtool -g eth0` shows tcp-data-split is enabled.

The problem is in the setting situation.
In the ethnl_set_rings(), it first calls get_ringparam() to get the
current driver's config.
At that moment, if driver's tcp-data-split config is UNKNOWN, it returns
ENABLE if LRO/GRO/JUMBO is enabled.
Then, it sets values from the user and driver's current config to
kernel_ethtool_ringparam.
Last it calls .set_ringparam().
The driver, especially bnxt_en driver receives
ETHTOOL_TCP_DATA_SPLIT_ENABLED.
But it can't distinguish whether it is set by the user or just the
current config.

When user updates ring parameter, the new hds_config value is updated
and current hds_config value is stored to old_hdsconfig.
Driver's .set_ringparam() callback can distinguish a passed
tcp-data-split value is came from user explicitly.
If .set_ringparam() is failed, hds_config is rollbacked immediately.

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Taehee Yoo <ap420073@...il.com>
---

v6:
 - use hds_config instead of using tcp_data_split_mod.

v5:
 - Patch added.

 include/linux/ethtool.h | 2 ++
 net/ethtool/rings.c     | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index f711bfd75c4d..4e451084d58a 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -1134,12 +1134,14 @@ int ethtool_virtdev_set_link_ksettings(struct net_device *dev,
  * @rss_ctx:		XArray of custom RSS contexts
  * @rss_lock:		Protects entries in @rss_ctx.  May be taken from
  *			within RTNL.
+ * @hds_config:		HDS value from userspace.
  * @wol_enabled:	Wake-on-LAN is enabled
  * @module_fw_flash_in_progress: Module firmware flashing is in progress.
  */
 struct ethtool_netdev_state {
 	struct xarray		rss_ctx;
 	struct mutex		rss_lock;
+	u8			hds_config;
 	unsigned		wol_enabled:1;
 	unsigned		module_fw_flash_in_progress:1;
 };
diff --git a/net/ethtool/rings.c b/net/ethtool/rings.c
index b7865a14fdf8..2e8239a76234 100644
--- a/net/ethtool/rings.c
+++ b/net/ethtool/rings.c
@@ -203,6 +203,7 @@ ethnl_set_rings(struct ethnl_req_info *req_info, struct genl_info *info)
 
 	dev->ethtool_ops->get_ringparam(dev, &ringparam,
 					&kernel_ringparam, info->extack);
+	kernel_ringparam.tcp_data_split = dev->ethtool->hds_config;
 
 	ethnl_update_u32(&ringparam.rx_pending, tb[ETHTOOL_A_RINGS_RX], &mod);
 	ethnl_update_u32(&ringparam.rx_mini_pending,
@@ -252,6 +253,9 @@ ethnl_set_rings(struct ethnl_req_info *req_info, struct genl_info *info)
 
 	ret = dev->ethtool_ops->set_ringparam(dev, &ringparam,
 					      &kernel_ringparam, info->extack);
+	if (!ret)
+		dev->ethtool->hds_config = kernel_ringparam.tcp_data_split;
+
 	return ret < 0 ? ret : 1;
 }
 
-- 
2.34.1