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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
	"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.4 22/31] net_sched: blackhole: tell upper qdisc about dropped packets
Date: Fri, 20 Jul 2018 14:13:52 +0200	[thread overview]
Message-ID: <20180720121340.953486016@linuxfoundation.org> (raw)
In-Reply-To: <20180720121340.158484922@linuxfoundation.org>

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>

[ Upstream commit 7e85dc8cb35abf16455f1511f0670b57c1a84608 ]

When blackhole is used on top of classful qdisc like hfsc it breaks
qlen and backlog counters because packets are disappear without notice.

In HFSC non-zero qlen while all classes are inactive triggers warning:
WARNING: ... at net/sched/sch_hfsc.c:1393 hfsc_dequeue+0xba4/0xe90 [sch_hfsc]
and schedules watchdog work endlessly.

This patch return __NET_XMIT_BYPASS in addition to NET_XMIT_SUCCESS,
this flag tells upper layer: this packet is gone and isn't queued.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/sched/sch_blackhole.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sched/sch_blackhole.c
+++ b/net/sched/sch_blackhole.c
@@ -20,7 +20,7 @@
 static int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 {
 	qdisc_drop(skb, sch);
-	return NET_XMIT_SUCCESS;
+	return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 }
 
 static struct sk_buff *blackhole_dequeue(struct Qdisc *sch)



  parent reply	other threads:[~2018-07-20 12:27 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-20 12:13 [PATCH 4.4 00/31] 4.4.143-stable review Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 01/31] compiler, clang: suppress warning for unused static inline functions Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 02/31] compiler, clang: properly override inline for clang Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 03/31] compiler, clang: always inline when CONFIG_OPTIMIZE_INLINING is disabled Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 04/31] compiler-gcc.h: Add __attribute__((gnu_inline)) to all inline declarations Greg Kroah-Hartman
2018-07-20 12:13   ` Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 05/31] x86/asm: Add _ASM_ARG* constants for argument registers to <asm/asm.h> Greg Kroah-Hartman
2018-07-20 12:13 ` Greg Kroah-Hartman
2018-07-20 12:13   ` Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 06/31] Revert "sit: reload iphdr in ipip6_rcv" Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 07/31] ocfs2: subsystem.su_mutex is required while accessing the item->ci_parent Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 08/31] bcm63xx_enet: correct clock usage Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 09/31] bcm63xx_enet: do not write to random DMA channel on BCM6345 Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 10/31] crypto: crypto4xx - remove bad list_del Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 11/31] crypto: crypto4xx - fix crypto4xx_build_pdr, crypto4xx_build_sdr leak Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 12/31] atm: zatm: Fix potential Spectre v1 Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 13/31] net: dccp: avoid crash in ccid3_hc_rx_send_feedback() Greg Kroah-Hartman
2018-07-20 12:13   ` Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 14/31] net: dccp: switch rx_tstamp_last_feedback to monotonic clock Greg Kroah-Hartman
2018-07-20 12:13   ` Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 15/31] net/mlx5: Fix incorrect raw command length parsing Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 16/31] net: sungem: fix rx checksum support Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 17/31] qed: Limit msix vectors in kdump kernel to the minimum required count Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 18/31] r8152: napi hangup fix after disconnect Greg Kroah-Hartman
2018-07-20 12:13   ` [4.4,18/31] " Greg Kroah-Hartman
2018-08-24 16:38   ` [PATCH 4.4 18/31] " Ben Hutchings
2018-08-24 16:38     ` [4.4,18/31] " Ben Hutchings
2018-08-25  7:43     ` [PATCH 4.4 18/31] " Jiri Slaby
2018-08-25  7:43       ` [4.4,18/31] " Jiri Slaby
2018-09-12 18:54       ` [PATCH 4.4 18/31] " Ben Hutchings
2018-09-12 18:54         ` [4.4,18/31] " Ben Hutchings
2018-07-20 12:13 ` [PATCH 4.4 19/31] tcp: fix Fast Open key endianness Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 21/31] vhost_net: validate sock before trying to put its fd Greg Kroah-Hartman
2018-07-20 12:13 ` Greg Kroah-Hartman [this message]
2018-07-20 12:13 ` [PATCH 4.4 23/31] net/mlx5: Fix command interface race in polling mode Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 24/31] net: cxgb3_main: fix potential Spectre v1 Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 25/31] rtlwifi: rtl8821ae: fix firmware is not ready to run Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 26/31] MIPS: Call dump_stack() from show_regs() Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 27/31] MIPS: Use async IPIs for arch_trigger_cpumask_backtrace() Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 28/31] netfilter: ebtables: reject non-bridge targets Greg Kroah-Hartman
2018-07-20 12:13 ` [PATCH 4.4 29/31] KEYS: DNS: fix parsing multiple options Greg Kroah-Hartman
2018-07-20 12:14 ` [PATCH 4.4 30/31] rds: avoid unenecessary cong_update in loop transport Greg Kroah-Hartman
2018-07-20 12:14 ` [PATCH 4.4 31/31] net/nfc: Avoid stalls when nfc_alloc_send_skb() returned NULL Greg Kroah-Hartman
2018-07-20 13:34 ` [PATCH 4.4 00/31] 4.4.143-stable review Nathan Chancellor
2018-07-21  7:38 ` Naresh Kamboju
2018-07-21 13:39 ` Guenter Roeck

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