netdev - [PATCH net-next v6 6/9] net: devmem: add ring parameter filtering

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: <20241218144530.2963326-7-ap420073@gmail.com>
Date: Wed, 18 Dec 2024 14:45:27 +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 6/9] net: devmem: add ring parameter filtering

If driver doesn't support ring parameter or tcp-data-split configuration
is not sufficient, the devmem should not be set up.
Before setup the devmem, tcp-data-split should be ON and hds-thresh
value should be 0.

Tested-by: Stanislav Fomichev <sdf@...ichev.me>
Reviewed-by: Mina Almasry <almasrymina@...gle.com>
Signed-off-by: Taehee Yoo <ap420073@...il.com>
---

v6:
 - No changes.

v5:
 - Add Review tag from Mina.

v4:
 - Check condition before __netif_get_rx_queue().
 - Separate condition check.
 - Add Test tag from Stanislav.

v3:
 - Patch added.

 net/core/devmem.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/net/core/devmem.c b/net/core/devmem.c
index 0b6ed7525b22..a29333af3ebd 100644
--- a/net/core/devmem.c
+++ b/net/core/devmem.c
@@ -8,6 +8,8 @@
  */
 
 #include <linux/dma-buf.h>
+#include <linux/ethtool.h>
+#include <linux/ethtool_netlink.h>
 #include <linux/genalloc.h>
 #include <linux/mm.h>
 #include <linux/netdevice.h>
@@ -131,6 +133,8 @@ int net_devmem_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx,
 				    struct net_devmem_dmabuf_binding *binding,
 				    struct netlink_ext_ack *extack)
 {
+	struct kernel_ethtool_ringparam kernel_ringparam = {};
+	struct ethtool_ringparam ringparam = {};
 	struct netdev_rx_queue *rxq;
 	u32 xa_idx;
 	int err;
@@ -140,6 +144,21 @@ int net_devmem_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx,
 		return -ERANGE;
 	}
 
+	if (dev->ethtool->hds_config != ETHTOOL_TCP_DATA_SPLIT_ENABLED) {
+		NL_SET_ERR_MSG(extack, "tcp-data-split is disabled");
+		return -EINVAL;
+	}
+
+	if (!dev->ethtool_ops->get_ringparam)
+		return -EOPNOTSUPP;
+
+	dev->ethtool_ops->get_ringparam(dev, &ringparam, &kernel_ringparam,
+					extack);
+	if (kernel_ringparam.hds_thresh) {
+		NL_SET_ERR_MSG(extack, "hds-thresh is not zero");
+		return -EINVAL;
+	}
+
 	rxq = __netif_get_rx_queue(dev, rxq_idx);
 	if (rxq->mp_params.mp_priv) {
 		NL_SET_ERR_MSG(extack, "designated queue already memory provider bound");
-- 
2.34.1