[RFC net-next v4 2/9] netdev-genl: Dump napi_defer_hard_irqs

Joe Damato
2024-10-01T23:53:40Z

Support dumping defer_hard_irqs for a NAPI ID.

Signed-off-by: Joe Damato <jdamato@fastly.com>
---
Documentation/netlink/specs/netdev.yaml | 8 ++++++++
include/uapi/linux/netdev.h | 1 +
net/core/netdev-genl.c | 6 ++++++
tools/include/uapi/linux/netdev.h | 1 +
4 files changed, 16 insertions(+)

diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index 08412c279297..585e87ec3c16 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -248,6 +248,13 @@ attribute-sets:
threaded mode. If NAPI is not in threaded mode (i.e. uses normal
softirq context), the attribute will be absent.
type: u32
+ -
+ name: defer-hard-irqs
+ doc: The number of consecutive empty polls before IRQ deferral ends
+ and hardware IRQs are re-enabled.
+ type: u32
+ checks:
+ max: s32-max
-
name: queue
attributes:
@@ -636,6 +643,7 @@ operations:
- ifindex
- irq
- pid
+ - defer-hard-irqs
dump:
request:
attributes:
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index 7c308f04e7a0..13dc0b027e86 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -122,6 +122,7 @@ enum {
NETDEV_A_NAPI_ID,
NETDEV_A_NAPI_IRQ,
NETDEV_A_NAPI_PID,
+ NETDEV_A_NAPI_DEFER_HARD_IRQS,

__NETDEV_A_NAPI_MAX,
NETDEV_A_NAPI_MAX = (__NETDEV_A_NAPI_MAX - 1)
diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index 1cb954f2d39e..de9bd76f43f8 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -161,6 +161,7 @@ static int
netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
const struct genl_info *info)
{
+ u32 napi_defer_hard_irqs;
void *hdr;
pid_t pid;

@@ -189,6 +190,11 @@ netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi,
goto nla_put_failure;
}

+ napi_defer_hard_irqs = napi_get_defer_hard_irqs(napi);
+ if (nla_put_s32(rsp, NETDEV_A_NAPI_DEFER_HARD_IRQS,
+ napi_defer_hard_irqs))
+ goto nla_put_failure;
+
genlmsg_end(rsp, hdr);

return 0;
diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h
index 7c308f04e7a0..13dc0b027e86 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -122,6 +122,7 @@ enum {
NETDEV_A_NAPI_ID,
NETDEV_A_NAPI_IRQ,
NETDEV_A_NAPI_PID,
+ NETDEV_A_NAPI_DEFER_HARD_IRQS,

__NETDEV_A_NAPI_MAX,
NETDEV_A_NAPI_MAX = (__NETDEV_A_NAPI_MAX - 1)
--
2.25.1