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Subject[PATCH net-next 03/12] ethtool: set coalescing parameters with COALESCE_SET request
Date
Implement COALESCE_SET netlink request to set coalescing parameters of
a network device. These are traditionally set with ETHTOOL_SCOALESCE ioctl
request. This commit adds only support for device coalescing parameters,
not per queue coalescing parameters.

Like the ioctl implementation, the generic ethtool code checks if only
supported parameters are modified; if not, first offending attribute is
reported using extack.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
---
Documentation/networking/ethtool-netlink.rst | 42 +++++-
include/uapi/linux/ethtool_netlink.h | 1 +
net/ethtool/coalesce.c | 136 +++++++++++++++++++
net/ethtool/netlink.c | 5 +
net/ethtool/netlink.h | 1 +
5 files changed, 184 insertions(+), 1 deletion(-)

diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index 1e84686a998b..b593c7f50934 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -198,6 +198,7 @@ Userspace to kernel:
``ETHTOOL_MSG_CHANNELS_GET`` get channel counts
``ETHTOOL_MSG_CHANNELS_SET`` set channel counts
``ETHTOOL_MSG_COALESCE_GET`` get coalescing parameters
+ ``ETHTOOL_MSG_COALESCE_SET`` set coalescing parameters
===================================== ================================

Kernel to userspace:
@@ -791,6 +792,45 @@ corresponding bit in ``ethtool_ops::supported_coalesce_params`` is set (i.e.
they are declared as supported by driver).


+COALESCE_SET
+============
+
+Sets coalescing parameters like ``ETHTOOL_SCOALESCE`` ioctl request.
+
+Request contents:
+
+ =========================================== ====== =======================
+ ``ETHTOOL_A_COALESCE_HEADER`` nested request header
+ ``ETHTOOL_A_COALESCE_RX_USECS`` u32 delay (us), normal Rx
+ ``ETHTOOL_A_COALESCE_RX_MAX_FRAMES`` u32 max packets, normal Rx
+ ``ETHTOOL_A_COALESCE_RX_USECS_IRQ`` u32 delay (us), Rx in IRQ
+ ``ETHTOOL_A_COALESCE_RX_MAX_FRAMES_IRQ`` u32 max packets, Rx in IRQ
+ ``ETHTOOL_A_COALESCE_TX_USECS`` u32 delay (us), normal Tx
+ ``ETHTOOL_A_COALESCE_TX_MAX_FRAMES`` u32 max packets, normal Tx
+ ``ETHTOOL_A_COALESCE_TX_USECS_IRQ`` u32 delay (us), Tx in IRQ
+ ``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_IRQ`` u32 IRQ packets, Tx in IRQ
+ ``ETHTOOL_A_COALESCE_STATS_BLOCK_USECS`` u32 delay of stats update
+ ``ETHTOOL_A_COALESCE_USE_ADAPTIVE_RX`` bool adaptive Rx coalesce
+ ``ETHTOOL_A_COALESCE_USE_ADAPTIVE_TX`` bool adaptive Tx coalesce
+ ``ETHTOOL_A_COALESCE_PKT_RATE_LOW`` u32 threshold for low rate
+ ``ETHTOOL_A_COALESCE_RX_USECS_LOW`` u32 delay (us), low Rx
+ ``ETHTOOL_A_COALESCE_RX_MAX_FRAMES_LOW`` u32 max packets, low Rx
+ ``ETHTOOL_A_COALESCE_TX_USECS_LOW`` u32 delay (us), low Tx
+ ``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_LOW`` u32 max packets, low Tx
+ ``ETHTOOL_A_COALESCE_PKT_RATE_HIGH`` u32 threshold for high rate
+ ``ETHTOOL_A_COALESCE_RX_USECS_HIGH`` u32 delay (us), high Rx
+ ``ETHTOOL_A_COALESCE_RX_MAX_FRAMES_HIGH`` u32 max packets, high Rx
+ ``ETHTOOL_A_COALESCE_TX_USECS_HIGH`` u32 delay (us), high Tx
+ ``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH`` u32 max packets, high Tx
+ ``ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL`` u32 rate sampling interval
+ =========================================== ====== =======================
+
+Request is rejected if it attributes declared as unsupported by driver (i.e.
+such that the corresponding bit in ``ethtool_ops::supported_coalesce_params``
+is not set), regardless of their values. Driver may impose additional
+constraints on coalescing parameters and their values.
+
+
Request translation
===================

@@ -816,7 +856,7 @@ have their netlink replacement yet.
``ETHTOOL_GEEPROM`` n/a
``ETHTOOL_SEEPROM`` n/a
``ETHTOOL_GCOALESCE`` ``ETHTOOL_MSG_COALESCE_GET``
- ``ETHTOOL_SCOALESCE`` n/a
+ ``ETHTOOL_SCOALESCE`` ``ETHTOOL_MSG_COALESCE_SET``
``ETHTOOL_GRINGPARAM`` ``ETHTOOL_MSG_RINGS_GET``
``ETHTOOL_SRINGPARAM`` ``ETHTOOL_MSG_RINGS_SET``
``ETHTOOL_GPAUSEPARAM`` n/a
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index ed0c0fa103cd..d9f4047c64c3 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -33,6 +33,7 @@ enum {
ETHTOOL_MSG_CHANNELS_GET,
ETHTOOL_MSG_CHANNELS_SET,
ETHTOOL_MSG_COALESCE_GET,
+ ETHTOOL_MSG_COALESCE_SET,

/* add new constants above here */
__ETHTOOL_MSG_USER_CNT,
diff --git a/net/ethtool/coalesce.c b/net/ethtool/coalesce.c
index ba5f2cec4ac4..3fce41a59108 100644
--- a/net/ethtool/coalesce.c
+++ b/net/ethtool/coalesce.c
@@ -212,3 +212,139 @@ const struct ethnl_request_ops ethnl_coalesce_request_ops = {
.reply_size = coalesce_reply_size,
.fill_reply = coalesce_fill_reply,
};
+
+/* COALESCE_SET */
+
+static const struct nla_policy
+coalesce_set_policy[ETHTOOL_A_COALESCE_MAX + 1] = {
+ [ETHTOOL_A_COALESCE_UNSPEC] = { .type = NLA_REJECT },
+ [ETHTOOL_A_COALESCE_HEADER] = { .type = NLA_NESTED },
+ [ETHTOOL_A_COALESCE_RX_USECS] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_RX_MAX_FRAMES] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_RX_USECS_IRQ] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_RX_MAX_FRAMES_IRQ] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_TX_USECS] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_TX_MAX_FRAMES] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_TX_USECS_IRQ] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_TX_MAX_FRAMES_IRQ] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_STATS_BLOCK_USECS] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_USE_ADAPTIVE_RX] = { .type = NLA_U8 },
+ [ETHTOOL_A_COALESCE_USE_ADAPTIVE_TX] = { .type = NLA_U8 },
+ [ETHTOOL_A_COALESCE_PKT_RATE_LOW] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_RX_USECS_LOW] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_RX_MAX_FRAMES_LOW] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_TX_USECS_LOW] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_TX_MAX_FRAMES_LOW] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_PKT_RATE_HIGH] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_RX_USECS_HIGH] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_RX_MAX_FRAMES_HIGH] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_TX_USECS_HIGH] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH] = { .type = NLA_U32 },
+ [ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL] = { .type = NLA_U32 },
+};
+
+int ethnl_set_coalesce(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr *tb[ETHTOOL_A_COALESCE_MAX + 1];
+ struct ethtool_coalesce coalesce = {};
+ struct ethnl_req_info req_info = {};
+ const struct ethtool_ops *ops;
+ struct net_device *dev;
+ u32 supported_params;
+ bool mod = false;
+ int ret;
+ u16 a;
+
+ ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
+ ETHTOOL_A_COALESCE_MAX, coalesce_set_policy,
+ info->extack);
+ if (ret < 0)
+ return ret;
+ ret = ethnl_parse_header_dev_get(&req_info,
+ tb[ETHTOOL_A_COALESCE_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_coalesce || !ops->set_coalesce)
+ goto out_dev;
+
+ /* make sure that only supported parameters are present */
+ supported_params = ops->supported_coalesce_params;
+ for (a = ETHTOOL_A_COALESCE_RX_USECS; a < __ETHTOOL_A_COALESCE_CNT; a++)
+ if (tb[a] && !(supported_params & attr_to_mask(a))) {
+ ret = -EINVAL;
+ NL_SET_ERR_MSG_ATTR(info->extack, tb[a],
+ "cannot modify an unsupported parameter");
+ goto out_dev;
+ }
+
+ rtnl_lock();
+ ret = ethnl_ops_begin(dev);
+ if (ret < 0)
+ goto out_rtnl;
+ ret = ops->get_coalesce(dev, &coalesce);
+ if (ret < 0)
+ goto out_ops;
+
+ ethnl_update_u32(&coalesce.rx_coalesce_usecs,
+ tb[ETHTOOL_A_COALESCE_RX_USECS], &mod);
+ ethnl_update_u32(&coalesce.rx_max_coalesced_frames,
+ tb[ETHTOOL_A_COALESCE_RX_MAX_FRAMES], &mod);
+ ethnl_update_u32(&coalesce.rx_coalesce_usecs_irq,
+ tb[ETHTOOL_A_COALESCE_RX_USECS_IRQ], &mod);
+ ethnl_update_u32(&coalesce.rx_max_coalesced_frames_irq,
+ tb[ETHTOOL_A_COALESCE_RX_MAX_FRAMES_IRQ], &mod);
+ ethnl_update_u32(&coalesce.tx_coalesce_usecs,
+ tb[ETHTOOL_A_COALESCE_TX_USECS], &mod);
+ ethnl_update_u32(&coalesce.tx_max_coalesced_frames,
+ tb[ETHTOOL_A_COALESCE_TX_MAX_FRAMES], &mod);
+ ethnl_update_u32(&coalesce.tx_coalesce_usecs_irq,
+ tb[ETHTOOL_A_COALESCE_TX_USECS_IRQ], &mod);
+ ethnl_update_u32(&coalesce.tx_max_coalesced_frames_irq,
+ tb[ETHTOOL_A_COALESCE_TX_MAX_FRAMES_IRQ], &mod);
+ ethnl_update_u32(&coalesce.stats_block_coalesce_usecs,
+ tb[ETHTOOL_A_COALESCE_STATS_BLOCK_USECS], &mod);
+ ethnl_update_bool32(&coalesce.use_adaptive_rx_coalesce,
+ tb[ETHTOOL_A_COALESCE_USE_ADAPTIVE_RX], &mod);
+ ethnl_update_bool32(&coalesce.use_adaptive_tx_coalesce,
+ tb[ETHTOOL_A_COALESCE_USE_ADAPTIVE_TX], &mod);
+ ethnl_update_u32(&coalesce.pkt_rate_low,
+ tb[ETHTOOL_A_COALESCE_PKT_RATE_LOW], &mod);
+ ethnl_update_u32(&coalesce.rx_coalesce_usecs_low,
+ tb[ETHTOOL_A_COALESCE_RX_USECS_LOW], &mod);
+ ethnl_update_u32(&coalesce.rx_max_coalesced_frames_low,
+ tb[ETHTOOL_A_COALESCE_RX_MAX_FRAMES_LOW], &mod);
+ ethnl_update_u32(&coalesce.tx_coalesce_usecs_low,
+ tb[ETHTOOL_A_COALESCE_TX_USECS_LOW], &mod);
+ ethnl_update_u32(&coalesce.tx_max_coalesced_frames_low,
+ tb[ETHTOOL_A_COALESCE_TX_MAX_FRAMES_LOW], &mod);
+ ethnl_update_u32(&coalesce.pkt_rate_high,
+ tb[ETHTOOL_A_COALESCE_PKT_RATE_HIGH], &mod);
+ ethnl_update_u32(&coalesce.rx_coalesce_usecs_high,
+ tb[ETHTOOL_A_COALESCE_RX_USECS_HIGH], &mod);
+ ethnl_update_u32(&coalesce.rx_max_coalesced_frames_high,
+ tb[ETHTOOL_A_COALESCE_RX_MAX_FRAMES_HIGH], &mod);
+ ethnl_update_u32(&coalesce.tx_coalesce_usecs_high,
+ tb[ETHTOOL_A_COALESCE_TX_USECS_HIGH], &mod);
+ ethnl_update_u32(&coalesce.tx_max_coalesced_frames_high,
+ tb[ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH], &mod);
+ ethnl_update_u32(&coalesce.rate_sample_interval,
+ tb[ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL], &mod);
+ ret = 0;
+ if (!mod)
+ goto out_ops;
+
+ ret = dev->ethtool_ops->set_coalesce(dev, &coalesce);
+
+out_ops:
+ ethnl_ops_complete(dev);
+out_rtnl:
+ rtnl_unlock();
+out_dev:
+ dev_put(dev);
+ return ret;
+}
diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 3db6ad69ebc9..3a236b4dfbf3 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -794,6 +794,11 @@ static const struct genl_ops ethtool_genl_ops[] = {
.dumpit = ethnl_default_dumpit,
.done = ethnl_default_done,
},
+ {
+ .cmd = ETHTOOL_MSG_COALESCE_SET,
+ .flags = GENL_UNS_ADMIN_PERM,
+ .doit = ethnl_set_coalesce,
+ },
};

static const struct genl_multicast_group ethtool_nl_mcgrps[] = {
diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index 8b8991867ee5..c3fb4fe5a3b7 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -351,5 +351,6 @@ 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);
int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info);
+int ethnl_set_coalesce(struct sk_buff *skb, struct genl_info *info);

#endif /* _NET_ETHTOOL_NETLINK_H */
--
2.25.1
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