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Date: Thu, 19 Nov 2020 11:54:09 +0800
From: Huazhong Tan <tanhuazhong@...wei.com>
To: <davem@...emloft.net>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linuxarm@...wei.com>, <kuba@...nel.org>,
Huazhong Tan <tanhuazhong@...wei.com>
Subject: [RFC net-next 1/2] ethtool: add support for controling the type of adaptive coalescing
Since the information whether the adaptive behavior is implemented
by DIM or driver custom is useful, so add new attribute to
ETHTOOL_MSG_COALESCE_GET/ETHTOOL_MSG_COALESCE_SET commands to control
the type of adaptive coalescing.
Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
---
include/linux/ethtool.h | 1 +
include/uapi/linux/ethtool.h | 2 ++
include/uapi/linux/ethtool_netlink.h | 1 +
net/ethtool/coalesce.c | 11 +++++++++--
net/ethtool/netlink.h | 2 +-
5 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 6408b44..f57cb92 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -215,6 +215,7 @@ bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
#define ETHTOOL_COALESCE_TX_USECS_HIGH BIT(19)
#define ETHTOOL_COALESCE_TX_MAX_FRAMES_HIGH BIT(20)
#define ETHTOOL_COALESCE_RATE_SAMPLE_INTERVAL BIT(21)
+#define ETHTOOL_COALESCE_USE_DIM BIT(22)
#define ETHTOOL_COALESCE_USECS \
(ETHTOOL_COALESCE_RX_USECS | ETHTOOL_COALESCE_TX_USECS)
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 9ca87bc..afd8de2 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -433,6 +433,7 @@ struct ethtool_modinfo {
* a TX interrupt, when the packet rate is above @pkt_rate_high.
* @rate_sample_interval: How often to do adaptive coalescing packet rate
* sampling, measured in seconds. Must not be zero.
+ * @use_dim: Use DIM for IRQ coalescing, if adaptive coalescing is enabled.
*
* Each pair of (usecs, max_frames) fields specifies that interrupts
* should be coalesced until
@@ -483,6 +484,7 @@ struct ethtool_coalesce {
__u32 tx_coalesce_usecs_high;
__u32 tx_max_coalesced_frames_high;
__u32 rate_sample_interval;
+ __u32 use_dim;
};
/**
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index e2bf36e..e3458d9 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -366,6 +366,7 @@ enum {
ETHTOOL_A_COALESCE_TX_USECS_HIGH, /* u32 */
ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH, /* u32 */
ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL, /* u32 */
+ ETHTOOL_A_COALESCE_USE_DIM, /* u8 */
/* add new constants above here */
__ETHTOOL_A_COALESCE_CNT,
diff --git a/net/ethtool/coalesce.c b/net/ethtool/coalesce.c
index 1d6bc13..f12e5de 100644
--- a/net/ethtool/coalesce.c
+++ b/net/ethtool/coalesce.c
@@ -50,6 +50,7 @@ __CHECK_SUPPORTED_OFFSET(COALESCE_RX_MAX_FRAMES_HIGH);
__CHECK_SUPPORTED_OFFSET(COALESCE_TX_USECS_HIGH);
__CHECK_SUPPORTED_OFFSET(COALESCE_TX_MAX_FRAMES_HIGH);
__CHECK_SUPPORTED_OFFSET(COALESCE_RATE_SAMPLE_INTERVAL);
+__CHECK_SUPPORTED_OFFSET(COALESCE_USE_DIM);
const struct nla_policy ethnl_coalesce_get_policy[] = {
[ETHTOOL_A_COALESCE_HEADER] =
@@ -100,7 +101,8 @@ static int coalesce_reply_size(const struct ethnl_req_info *req_base,
nla_total_size(sizeof(u32)) + /* _RX_MAX_FRAMES_HIGH */
nla_total_size(sizeof(u32)) + /* _TX_USECS_HIGH */
nla_total_size(sizeof(u32)) + /* _TX_MAX_FRAMES_HIGH */
- nla_total_size(sizeof(u32)); /* _RATE_SAMPLE_INTERVAL */
+ nla_total_size(sizeof(u32)) + /* _RATE_SAMPLE_INTERVAL */
+ nla_total_size(sizeof(u8)); /* _USE_DIM */
}
static bool coalesce_put_u32(struct sk_buff *skb, u16 attr_type, u32 val,
@@ -170,7 +172,9 @@ static int coalesce_fill_reply(struct sk_buff *skb,
coalesce_put_u32(skb, ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH,
coal->tx_max_coalesced_frames_high, supported) ||
coalesce_put_u32(skb, ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL,
- coal->rate_sample_interval, supported))
+ coal->rate_sample_interval, supported) ||
+ coalesce_put_bool(skb, ETHTOOL_A_COALESCE_USE_DIM,
+ coal->use_dim, supported))
return -EMSGSIZE;
return 0;
@@ -215,6 +219,7 @@ const struct nla_policy ethnl_coalesce_set_policy[] = {
[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 },
+ [ETHTOOL_A_COALESCE_USE_DIM] = { .type = NLA_U8 },
};
int ethnl_set_coalesce(struct sk_buff *skb, struct genl_info *info)
@@ -303,6 +308,8 @@ int ethnl_set_coalesce(struct sk_buff *skb, struct genl_info *info)
tb[ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH], &mod);
ethnl_update_u32(&coalesce.rate_sample_interval,
tb[ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL], &mod);
+ ethnl_update_bool32(&coalesce.use_dim,
+ tb[ETHTOOL_A_COALESCE_USE_DIM], &mod);
ret = 0;
if (!mod)
goto out_ops;
diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index d8efec5..e63f44a 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -366,7 +366,7 @@ extern const struct nla_policy ethnl_rings_set_policy[ETHTOOL_A_RINGS_TX + 1];
extern const struct nla_policy ethnl_channels_get_policy[ETHTOOL_A_CHANNELS_HEADER + 1];
extern const struct nla_policy ethnl_channels_set_policy[ETHTOOL_A_CHANNELS_COMBINED_COUNT + 1];
extern const struct nla_policy ethnl_coalesce_get_policy[ETHTOOL_A_COALESCE_HEADER + 1];
-extern const struct nla_policy ethnl_coalesce_set_policy[ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL + 1];
+extern const struct nla_policy ethnl_coalesce_set_policy[ETHTOOL_A_COALESCE_USE_DIM + 1];
extern const struct nla_policy ethnl_pause_get_policy[ETHTOOL_A_PAUSE_HEADER + 1];
extern const struct nla_policy ethnl_pause_set_policy[ETHTOOL_A_PAUSE_TX + 1];
extern const struct nla_policy ethnl_eee_get_policy[ETHTOOL_A_EEE_HEADER + 1];
--
2.7.4
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