mirror of
https://github.com/openwrt/openwrt.git
synced 2025-01-10 23:12:48 +00:00
44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
|
From: Felix Fietkau <nbd@nbd.name>
|
||
|
|
Date: Fri, 3 Jan 2025 19:29:00 +0100
|
||
|
|
Subject: [PATCH] net: page_pool: try to free deferred skbs while waiting for
|
||
|
|
pool release
|
||
|
|
|
||
|
|
The NAPI defer list can accumulate no longer used skbs, which can be reused
|
||
|
|
during alloc. If this happens on a CPU that otherwise does not do any
|
||
|
|
rx softirq processing, skbs can be held indefinitely, causing warnings
|
||
|
|
on releasing page pools.
|
||
|
|
Deal with this by scheduling rx softirq on all CPUs.
|
||
|
|
|
||
|
|
Patch by Lorenzo Bianconi
|
||
|
|
|
||
|
|
Signed-off-by: Felix Fietkau <nbd@nbd.name>
|
||
|
|
---
|
||
|
|
|
||
|
|
--- a/net/core/page_pool.c
|
||
|
|
+++ b/net/core/page_pool.c
|
||
|
|
@@ -862,12 +862,23 @@ static void page_pool_release_retry(stru
|
||
|
|
{
|
||
|
|
struct delayed_work *dwq = to_delayed_work(wq);
|
||
|
|
struct page_pool *pool = container_of(dwq, typeof(*pool), release_dw);
|
||
|
|
- int inflight;
|
||
|
|
+ int cpu, inflight;
|
||
|
|
|
||
|
|
inflight = page_pool_release(pool);
|
||
|
|
if (!inflight)
|
||
|
|
return;
|
||
|
|
|
||
|
|
+ /* Run NET_RX_SOFTIRQ in order to free pending skbs in softnet_data
|
||
|
|
+ * defer_list that can stay in the list until we have enough queued
|
||
|
|
+ * traffic.
|
||
|
|
+ */
|
||
|
|
+ for_each_online_cpu(cpu) {
|
||
|
|
+ struct softnet_data *sd = &per_cpu(softnet_data, cpu);
|
||
|
|
+
|
||
|
|
+ if (!cmpxchg(&sd->defer_ipi_scheduled, 0, 1))
|
||
|
|
+ smp_call_function_single_async(cpu, &sd->defer_csd);
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
/* Periodic warning */
|
||
|
|
if (time_after_eq(jiffies, pool->defer_warn)) {
|
||
|
|
int sec = (s32)((u32)jiffies - (u32)pool->defer_start) / HZ;
|