From: Michal Kubecek <mkubecek@suse.cz>
To: David Miller <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org
Cc: Jiri Pirko <jiri@resnulli.us>, Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
John Linville <linville@tuxdriver.com>,
Johannes Berg <johannes@sipsolutions.net>,
linux-kernel@vger.kernel.org
Subject: [PATCH net-next v2 11/15] ethtool: set device ring sizes with RINGS_SET request
Date: Thu, 12 Mar 2020 21:08:28 +0100 (CET) [thread overview]
Message-ID: <c860bc9a0d6ba1be03ff9e1ed6322216559d11d0.1584043144.git.mkubecek@suse.cz> (raw)
In-Reply-To: <cover.1584043144.git.mkubecek@suse.cz>
Implement RINGS_SET netlink request to set ring sizes of a network device.
These are traditionally set with ETHTOOL_SRINGPARAM ioctl request.
Like the ioctl implementation, the generic ethtool code checks if supplied
values do not exceed driver defined limits; if they do, first offending
attribute is reported using extack.
v2:
- fix netdev reference leak in error path (found by Jakub Kicinsky)
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
---
Documentation/networking/ethtool-netlink.rst | 23 ++++-
include/uapi/linux/ethtool_netlink.h | 1 +
net/ethtool/netlink.c | 5 ++
net/ethtool/netlink.h | 1 +
net/ethtool/rings.c | 89 ++++++++++++++++++++
5 files changed, 118 insertions(+), 1 deletion(-)
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index 798c2f97d89b..ba31ae8f1feb 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -194,6 +194,7 @@ Userspace to kernel:
``ETHTOOL_MSG_PRIVFLAGS_GET`` get private flags
``ETHTOOL_MSG_PRIVFLAGS_SET`` set private flags
``ETHTOOL_MSG_RINGS_GET`` get ring sizes
+ ``ETHTOOL_MSG_RINGS_SET`` set ring sizes
===================================== ================================
Kernel to userspace:
@@ -673,6 +674,26 @@ Kernel response contents:
==================================== ====== ==========================
+RINGS_SET
+=========
+
+Sets ring sizes like ``ETHTOOL_SRINGPARAM`` ioctl request.
+
+Request contents:
+
+ ==================================== ====== ==========================
+ ``ETHTOOL_A_RINGS_HEADER`` nested reply header
+ ``ETHTOOL_A_RINGS_RX`` u32 size of RX ring
+ ``ETHTOOL_A_RINGS_RX_MINI`` u32 size of RX mini ring
+ ``ETHTOOL_A_RINGS_RX_JUMBO`` u32 size of RX jumbo ring
+ ``ETHTOOL_A_RINGS_TX`` u32 size of TX ring
+ ==================================== ====== ==========================
+
+Kernel checks that requested ring sizes do not exceed limits reported by
+driver. Driver may impose additional constraints and may not suspport all
+attributes.
+
+
Request translation
===================
@@ -700,7 +721,7 @@ have their netlink replacement yet.
``ETHTOOL_GCOALESCE`` n/a
``ETHTOOL_SCOALESCE`` n/a
``ETHTOOL_GRINGPARAM`` ``ETHTOOL_MSG_RINGS_GET``
- ``ETHTOOL_SRINGPARAM`` n/a
+ ``ETHTOOL_SRINGPARAM`` ``ETHTOOL_MSG_RINGS_SET``
``ETHTOOL_GPAUSEPARAM`` n/a
``ETHTOOL_SPAUSEPARAM`` n/a
``ETHTOOL_GRXCSUM`` ``ETHTOOL_MSG_FEATURES_GET``
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index 7cd220f8cf73..ae71801b7aac 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -29,6 +29,7 @@ enum {
ETHTOOL_MSG_PRIVFLAGS_GET,
ETHTOOL_MSG_PRIVFLAGS_SET,
ETHTOOL_MSG_RINGS_GET,
+ ETHTOOL_MSG_RINGS_SET,
/* add new constants above here */
__ETHTOOL_MSG_USER_CNT,
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 0dc25a490450..6a1ac8897a7e 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -756,6 +756,11 @@ static const struct genl_ops ethtool_genl_ops[] = {
.dumpit = ethnl_default_dumpit,
.done = ethnl_default_done,
},
+ {
+ .cmd = ETHTOOL_MSG_RINGS_SET,
+ .flags = GENL_UNS_ADMIN_PERM,
+ .doit = ethnl_set_rings,
+ },
};
static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index 01761932ed15..b30426d01890 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -347,5 +347,6 @@ int ethnl_set_debug(struct sk_buff *skb, struct genl_info *info);
int ethnl_set_wol(struct sk_buff *skb, struct genl_info *info);
int ethnl_set_features(struct sk_buff *skb, struct genl_info *info);
int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info);
+int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info);
#endif /* _NET_ETHTOOL_NETLINK_H */
diff --git a/net/ethtool/rings.c b/net/ethtool/rings.c
index d3129d8a252d..93f428e9a6c2 100644
--- a/net/ethtool/rings.c
+++ b/net/ethtool/rings.c
@@ -106,3 +106,92 @@ const struct ethnl_request_ops ethnl_rings_request_ops = {
.reply_size = rings_reply_size,
.fill_reply = rings_fill_reply,
};
+
+/* RINGS_SET */
+
+static const struct nla_policy
+rings_set_policy[ETHTOOL_A_RINGS_MAX + 1] = {
+ [ETHTOOL_A_RINGS_UNSPEC] = { .type = NLA_REJECT },
+ [ETHTOOL_A_RINGS_HEADER] = { .type = NLA_NESTED },
+ [ETHTOOL_A_RINGS_RX_MAX] = { .type = NLA_REJECT },
+ [ETHTOOL_A_RINGS_RX_MINI_MAX] = { .type = NLA_REJECT },
+ [ETHTOOL_A_RINGS_RX_JUMBO_MAX] = { .type = NLA_REJECT },
+ [ETHTOOL_A_RINGS_TX_MAX] = { .type = NLA_REJECT },
+ [ETHTOOL_A_RINGS_RX] = { .type = NLA_U32 },
+ [ETHTOOL_A_RINGS_RX_MINI] = { .type = NLA_U32 },
+ [ETHTOOL_A_RINGS_RX_JUMBO] = { .type = NLA_U32 },
+ [ETHTOOL_A_RINGS_TX] = { .type = NLA_U32 },
+};
+
+int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr *tb[ETHTOOL_A_RINGS_MAX + 1];
+ struct ethtool_ringparam ringparam = {};
+ struct ethnl_req_info req_info = {};
+ const struct nlattr *err_attr;
+ const struct ethtool_ops *ops;
+ struct net_device *dev;
+ bool mod = false;
+ int ret;
+
+ ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
+ ETHTOOL_A_RINGS_MAX, rings_set_policy,
+ info->extack);
+ if (ret < 0)
+ return ret;
+ ret = ethnl_parse_header_dev_get(&req_info,
+ tb[ETHTOOL_A_RINGS_HEADER],
+ genl_info_net(info), info->extack,
+ true);
+ if (ret < 0)
+ return ret;
+ dev = req_info.dev;
+ ops = dev->ethtool_ops;
+ ret = -EOPNOTSUPP;
+ if (!ops->get_ringparam || !ops->set_ringparam)
+ goto out_dev;
+
+ rtnl_lock();
+ ret = ethnl_ops_begin(dev);
+ if (ret < 0)
+ goto out_rtnl;
+ ops->get_ringparam(dev, &ringparam);
+
+ ethnl_update_u32(&ringparam.rx_pending, tb[ETHTOOL_A_RINGS_RX], &mod);
+ ethnl_update_u32(&ringparam.rx_mini_pending,
+ tb[ETHTOOL_A_RINGS_RX_MINI], &mod);
+ ethnl_update_u32(&ringparam.rx_jumbo_pending,
+ tb[ETHTOOL_A_RINGS_RX_JUMBO], &mod);
+ ethnl_update_u32(&ringparam.tx_pending, tb[ETHTOOL_A_RINGS_TX], &mod);
+ ret = 0;
+ if (!mod)
+ goto out_ops;
+
+ /* ensure new ring parameters are within limits */
+ if (ringparam.rx_pending > ringparam.rx_max_pending)
+ err_attr = tb[ETHTOOL_A_RINGS_RX];
+ else if (ringparam.rx_mini_pending > ringparam.rx_mini_max_pending)
+ err_attr = tb[ETHTOOL_A_RINGS_RX_MINI];
+ else if (ringparam.rx_jumbo_pending > ringparam.rx_jumbo_max_pending)
+ err_attr = tb[ETHTOOL_A_RINGS_RX_JUMBO];
+ else if (ringparam.tx_pending > ringparam.tx_max_pending)
+ err_attr = tb[ETHTOOL_A_RINGS_TX];
+ else
+ err_attr = NULL;
+ if (err_attr) {
+ ret = -EINVAL;
+ NL_SET_ERR_MSG_ATTR(info->extack, err_attr,
+ "requested ring size exceeeds maximum");
+ goto out_ops;
+ }
+
+ ret = dev->ethtool_ops->set_ringparam(dev, &ringparam);
+
+out_ops:
+ ethnl_ops_complete(dev);
+out_rtnl:
+ rtnl_unlock();
+out_dev:
+ dev_put(dev);
+ return ret;
+}
--
2.25.1
next prev parent reply other threads:[~2020-03-12 20:08 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-12 20:07 [PATCH net-next v2 00/15] ethtool netlink interface, part 3 Michal Kubecek
2020-03-12 20:07 ` [PATCH net-next v2 01/15] ethtool: rename ethnl_parse_header() to ethnl_parse_header_dev_get() Michal Kubecek
2020-03-12 20:07 ` [PATCH net-next v2 02/15] ethtool: update mapping of features to legacy ioctl requests Michal Kubecek
2020-03-12 20:07 ` [PATCH net-next v2 03/15] ethtool: provide netdev features with FEATURES_GET request Michal Kubecek
2020-03-12 20:07 ` [PATCH net-next v2 04/15] ethtool: add ethnl_parse_bitset() helper Michal Kubecek
2020-03-12 20:07 ` [PATCH net-next v2 05/15] ethtool: set netdev features with FEATURES_SET request Michal Kubecek
2020-03-12 20:08 ` [PATCH net-next v2 06/15] ethtool: add FEATURES_NTF notification Michal Kubecek
2020-03-12 20:08 ` [PATCH net-next v2 07/15] ethtool: provide private flags with PRIVFLAGS_GET request Michal Kubecek
2020-03-12 20:08 ` [PATCH net-next v2 08/15] ethtool: set device private flags with PRIVFLAGS_SET request Michal Kubecek
2020-03-12 20:08 ` [PATCH net-next v2 09/15] ethtool: add PRIVFLAGS_NTF notification Michal Kubecek
2020-03-12 20:08 ` [PATCH net-next v2 10/15] ethtool: provide ring sizes with RINGS_GET request Michal Kubecek
2020-03-12 20:48 ` Jakub Kicinski
2020-03-12 20:08 ` Michal Kubecek [this message]
2020-03-12 20:50 ` [PATCH net-next v2 11/15] ethtool: set device ring sizes with RINGS_SET request Jakub Kicinski
2020-03-12 20:08 ` [PATCH net-next v2 12/15] ethtool: add RINGS_NTF notification Michal Kubecek
2020-03-12 20:08 ` [PATCH net-next v2 13/15] ethtool: provide channel counts with CHANNELS_GET request Michal Kubecek
2020-03-12 20:51 ` Jakub Kicinski
2020-03-12 20:08 ` [PATCH net-next v2 14/15] ethtool: set device channel counts with CHANNELS_SET request Michal Kubecek
2020-03-12 20:54 ` Jakub Kicinski
2020-03-12 20:08 ` [PATCH net-next v2 15/15] ethtool: add CHANNELS_NTF notification Michal Kubecek
2020-03-12 22:32 ` [PATCH net-next v2 00/15] ethtool netlink interface, part 3 David Miller
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