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Message-ID: <1629353844-49626-2-git-send-email-moyufeng@huawei.com>
Date: Thu, 19 Aug 2021 14:17:21 +0800
From: Yufeng Mo <moyufeng@...wei.com>
To: <davem@...emloft.net>, <kuba@...nel.org>
CC: <netdev@...r.kernel.org>, <shenjian15@...wei.com>,
<lipeng321@...wei.com>, <yisen.zhuang@...wei.com>,
<linyunsheng@...wei.com>, <huangguangbin2@...wei.com>,
<chenhao288@...ilicon.com>, <salil.mehta@...wei.com>,
<moyufeng@...wei.com>, <linuxarm@...wei.com>,
<linuxarm@...neuler.org>, <dledford@...hat.com>, <jgg@...pe.ca>,
<netanel@...zon.com>, <akiyano@...zon.com>,
<thomas.lendacky@....com>, <irusskikh@...vell.com>,
<michael.chan@...adcom.com>, <edwin.peer@...adcom.com>,
<rohitm@...lsio.com>, <jacob.e.keller@...el.com>,
<ioana.ciornei@....com>, <vladimir.oltean@....com>,
<sgoutham@...vell.com>, <sbhatta@...vell.com>, <saeedm@...dia.com>,
<ecree.xilinx@...il.com>, <grygorii.strashko@...com>,
<merez@...eaurora.org>, <kvalo@...eaurora.org>,
<linux-wireless@...r.kernel.org>
Subject: [PATCH V2 net-next 1/4] ethtool: add two coalesce attributes for CQE mode
Currently, there are many drivers who support CQE mode configuration,
some configure it as a fixed when initialized, some provide an
interface to change it by ethtool private flags. In order to make it
more generic, add two new 'ETHTOOL_A_COALESCE_USE_CQE_TX' and
'ETHTOOL_A_COALESCE_USE_CQE_RX' coalesce attributes, then these
parameters can be accessed by ethtool netlink coalesce uAPI.
Also add an new structure kernel_ethtool_coalesce, then the
new parameter can be added into this struct.
Signed-off-by: Yufeng Mo <moyufeng@...wei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
Documentation/networking/ethtool-netlink.rst | 15 +++++++++++++++
include/linux/ethtool.h | 11 ++++++++++-
include/uapi/linux/ethtool_netlink.h | 2 ++
net/ethtool/coalesce.c | 19 +++++++++++++++++--
net/ethtool/netlink.h | 2 +-
5 files changed, 45 insertions(+), 4 deletions(-)
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
index c690bb3..d9b55b7 100644
--- a/Documentation/networking/ethtool-netlink.rst
+++ b/Documentation/networking/ethtool-netlink.rst
@@ -947,12 +947,25 @@ Kernel response contents:
``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
+ ``ETHTOOL_A_COALESCE_USE_CQE_TX`` bool timer reset mode, Tx
+ ``ETHTOOL_A_COALESCE_USE_CQE_RX`` bool timer reset mode, Rx
=========================================== ====== =======================
Attributes are only included in reply if their value is not zero or the
corresponding bit in ``ethtool_ops::supported_coalesce_params`` is set (i.e.
they are declared as supported by driver).
+Timer reset mode (``ETHTOOL_A_COALESCE_USE_CQE_TX`` and
+``ETHTOOL_A_COALESCE_USE_CQE_RX``) controls the interaction between packet
+arrival and the various time based delay parameters. By default timers are
+expected to limit the max delay between any packet arrival/departure and a
+corresponding interrupt. In this mode timer should be started by packet
+arrival (sometimes delivery of previous interrupt) and reset when interrupt
+is delivered.
+Setting the appropriate attribute to 1 will enable ``CQE`` mode, where
+each packet event resets the timer. In this mode timer is used to force
+the interrupt if queue goes idle, while busy queues depend on the packet
+limit to trigger interrupts.
COALESCE_SET
============
@@ -985,6 +998,8 @@ Request contents:
``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
+ ``ETHTOOL_A_COALESCE_USE_CQE_TX`` bool timer reset mode, Tx
+ ``ETHTOOL_A_COALESCE_USE_CQE_RX`` bool timer reset mode, Rx
=========================================== ====== =======================
Request is rejected if it attributes declared as unsupported by driver (i.e.
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 4711b96..a9d77a6 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -172,6 +172,11 @@ extern int
__ethtool_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *link_ksettings);
+struct kernel_ethtool_coalesce {
+ u8 use_cqe_mode_tx;
+ u8 use_cqe_mode_rx;
+};
+
/**
* ethtool_intersect_link_masks - Given two link masks, AND them together
* @dst: first mask and where result is stored
@@ -211,7 +216,9 @@ 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_ALL_PARAMS GENMASK(21, 0)
+#define ETHTOOL_COALESCE_USE_CQE_RX BIT(22)
+#define ETHTOOL_COALESCE_USE_CQE_TX BIT(23)
+#define ETHTOOL_COALESCE_ALL_PARAMS GENMASK(23, 0)
#define ETHTOOL_COALESCE_USECS \
(ETHTOOL_COALESCE_RX_USECS | ETHTOOL_COALESCE_TX_USECS)
@@ -237,6 +244,8 @@ bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
ETHTOOL_COALESCE_RX_USECS_LOW | ETHTOOL_COALESCE_RX_USECS_HIGH | \
ETHTOOL_COALESCE_PKT_RATE_LOW | ETHTOOL_COALESCE_PKT_RATE_HIGH | \
ETHTOOL_COALESCE_RATE_SAMPLE_INTERVAL)
+#define ETHTOOL_COALESCE_USE_CQE \
+ (ETHTOOL_COALESCE_USE_CQE_RX | ETHTOOL_COALESCE_USE_CQE_TX)
#define ETHTOOL_STAT_NOT_SET (~0ULL)
diff --git a/include/uapi/linux/ethtool_netlink.h b/include/uapi/linux/ethtool_netlink.h
index b3b9371..5545f1c 100644
--- a/include/uapi/linux/ethtool_netlink.h
+++ b/include/uapi/linux/ethtool_netlink.h
@@ -377,6 +377,8 @@ 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_CQE_MODE_TX, /* u8 */
+ ETHTOOL_A_COALESCE_USE_CQE_MODE_RX, /* u8 */
/* add new constants above here */
__ETHTOOL_A_COALESCE_CNT,
diff --git a/net/ethtool/coalesce.c b/net/ethtool/coalesce.c
index 1d6bc13..e6bc536 100644
--- a/net/ethtool/coalesce.c
+++ b/net/ethtool/coalesce.c
@@ -10,6 +10,7 @@ struct coalesce_req_info {
struct coalesce_reply_data {
struct ethnl_reply_data base;
struct ethtool_coalesce coalesce;
+ struct kernel_ethtool_coalesce kernel_coalesce;
u32 supported_params;
};
@@ -100,7 +101,9 @@ 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_CQE_MODE_TX */
+ nla_total_size(sizeof(u8)); /* _USE_CQE_MODE_RX */
}
static bool coalesce_put_u32(struct sk_buff *skb, u16 attr_type, u32 val,
@@ -124,6 +127,7 @@ static int coalesce_fill_reply(struct sk_buff *skb,
const struct ethnl_reply_data *reply_base)
{
const struct coalesce_reply_data *data = COALESCE_REPDATA(reply_base);
+ const struct kernel_ethtool_coalesce *kcoal = &data->kernel_coalesce;
const struct ethtool_coalesce *coal = &data->coalesce;
u32 supported = data->supported_params;
@@ -170,7 +174,11 @@ 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_CQE_MODE_TX,
+ kcoal->use_cqe_mode_tx, supported) ||
+ coalesce_put_bool(skb, ETHTOOL_A_COALESCE_USE_CQE_MODE_RX,
+ kcoal->use_cqe_mode_rx, supported))
return -EMSGSIZE;
return 0;
@@ -215,10 +223,13 @@ 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_CQE_MODE_TX] = NLA_POLICY_MAX(NLA_U8, 1),
+ [ETHTOOL_A_COALESCE_USE_CQE_MODE_RX] = NLA_POLICY_MAX(NLA_U8, 1),
};
int ethnl_set_coalesce(struct sk_buff *skb, struct genl_info *info)
{
+ struct kernel_ethtool_coalesce kernel_coalesce = {};
struct ethtool_coalesce coalesce = {};
struct ethnl_req_info req_info = {};
struct nlattr **tb = info->attrs;
@@ -303,6 +314,10 @@ 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_u8(&kernel_coalesce.use_cqe_mode_tx,
+ tb[ETHTOOL_A_COALESCE_USE_CQE_MODE_TX], &mod);
+ ethnl_update_u8(&kernel_coalesce.use_cqe_mode_rx,
+ tb[ETHTOOL_A_COALESCE_USE_CQE_MODE_RX], &mod);
ret = 0;
if (!mod)
goto out_ops;
diff --git a/net/ethtool/netlink.h b/net/ethtool/netlink.h
index 077aac3..e8987e2 100644
--- a/net/ethtool/netlink.h
+++ b/net/ethtool/netlink.h
@@ -359,7 +359,7 @@ 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_MAX + 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];
--
2.8.1
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