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netdev-genl: Support setting per-NAPI config values

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Add support to set per-NAPI defer_hard_irqs and gro_flush_timeout.

Signed-off-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20241011184527.16393-7-jdamato@fastly.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Joe Damato 2024-10-11 18:45:01 +00:00 committed by Jakub Kicinski
parent 86e25f40aa
commit 1287c1ae0f
6 changed files with 77 additions and 0 deletions
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11
Documentation/netlink/specs/netdev.yaml
View File

@ -693,6 +693,17 @@ operations:
reply:
attributes:
- id
-
name: napi-set
doc: Set configurable NAPI instance settings.
attribute-set: napi
flags: [ admin-perm ]
do:
request:
attributes:
- id
- defer-hard-irqs
- gro-flush-timeout
kernel-family:
headers: [ "linux/list.h"]

1
include/uapi/linux/netdev.h
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@ -201,6 +201,7 @@ enum {
NETDEV_CMD_NAPI_GET,
NETDEV_CMD_QSTATS_GET,
NETDEV_CMD_BIND_RX,
NETDEV_CMD_NAPI_SET,
__NETDEV_CMD_MAX,
NETDEV_CMD_MAX = (__NETDEV_CMD_MAX - 1)

18
net/core/netdev-genl-gen.c
View File

@ -22,6 +22,10 @@ static const struct netlink_range_validation netdev_a_page_pool_ifindex_range =
.max = 2147483647ULL,
};
static const struct netlink_range_validation netdev_a_napi_defer_hard_irqs_range = {
.max = 2147483647ULL,
};
/* Common nested types */
const struct nla_policy netdev_page_pool_info_nl_policy[NETDEV_A_PAGE_POOL_IFINDEX + 1] = {
[NETDEV_A_PAGE_POOL_ID] = NLA_POLICY_FULL_RANGE(NLA_UINT, &netdev_a_page_pool_id_range),
@ -87,6 +91,13 @@ static const struct nla_policy netdev_bind_rx_nl_policy[NETDEV_A_DMABUF_FD + 1]
[NETDEV_A_DMABUF_QUEUES] = NLA_POLICY_NESTED(netdev_queue_id_nl_policy),
};
/* NETDEV_CMD_NAPI_SET - do */
static const struct nla_policy netdev_napi_set_nl_policy[NETDEV_A_NAPI_GRO_FLUSH_TIMEOUT + 1] = {
[NETDEV_A_NAPI_ID] = { .type = NLA_U32, },
[NETDEV_A_NAPI_DEFER_HARD_IRQS] = NLA_POLICY_FULL_RANGE(NLA_U32, &netdev_a_napi_defer_hard_irqs_range),
[NETDEV_A_NAPI_GRO_FLUSH_TIMEOUT] = { .type = NLA_UINT, },
};
/* Ops table for netdev */
static const struct genl_split_ops netdev_nl_ops[] = {
{
@ -171,6 +182,13 @@ static const struct genl_split_ops netdev_nl_ops[] = {
.maxattr = NETDEV_A_DMABUF_FD,
.flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
},
{
.cmd = NETDEV_CMD_NAPI_SET,
.doit = netdev_nl_napi_set_doit,
.policy = netdev_napi_set_nl_policy,
.maxattr = NETDEV_A_NAPI_GRO_FLUSH_TIMEOUT,
.flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
},
};
static const struct genl_multicast_group netdev_nl_mcgrps[] = {

1
net/core/netdev-genl-gen.h
View File

@ -33,6 +33,7 @@ int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
int netdev_nl_qstats_get_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
int netdev_nl_bind_rx_doit(struct sk_buff *skb, struct genl_info *info);
int netdev_nl_napi_set_doit(struct sk_buff *skb, struct genl_info *info);
enum {
NETDEV_NLGRP_MGMT,

45
net/core/netdev-genl.c
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@ -303,6 +303,51 @@ int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
return err;
}
static int
netdev_nl_napi_set_config(struct napi_struct *napi, struct genl_info *info)
{
u64 gro_flush_timeout = 0;
u32 defer = 0;
if (info->attrs[NETDEV_A_NAPI_DEFER_HARD_IRQS]) {
defer = nla_get_u32(info->attrs[NETDEV_A_NAPI_DEFER_HARD_IRQS]);
napi_set_defer_hard_irqs(napi, defer);
}
if (info->attrs[NETDEV_A_NAPI_GRO_FLUSH_TIMEOUT]) {
gro_flush_timeout = nla_get_uint(info->attrs[NETDEV_A_NAPI_GRO_FLUSH_TIMEOUT]);
napi_set_gro_flush_timeout(napi, gro_flush_timeout);
}
return 0;
}
int netdev_nl_napi_set_doit(struct sk_buff *skb, struct genl_info *info)
{
struct napi_struct *napi;
unsigned int napi_id;
int err;
if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_NAPI_ID))
return -EINVAL;
napi_id = nla_get_u32(info->attrs[NETDEV_A_NAPI_ID]);
rtnl_lock();
napi = napi_by_id(napi_id);
if (napi) {
err = netdev_nl_napi_set_config(napi, info);
} else {
NL_SET_BAD_ATTR(info->extack, info->attrs[NETDEV_A_NAPI_ID]);
err = -ENOENT;
}
rtnl_unlock();
return err;
}
static int
netdev_nl_queue_fill_one(struct sk_buff *rsp, struct net_device *netdev,
u32 q_idx, u32 q_type, const struct genl_info *info)

1
tools/include/uapi/linux/netdev.h
View File

@ -201,6 +201,7 @@ enum {
NETDEV_CMD_NAPI_GET,
NETDEV_CMD_QSTATS_GET,
NETDEV_CMD_BIND_RX,
NETDEV_CMD_NAPI_SET,
__NETDEV_CMD_MAX,
NETDEV_CMD_MAX = (__NETDEV_CMD_MAX - 1)