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[2a03:2880:30ff:7::face:b00c]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aa20e08617esm50003766b.182.2024.11.14.03.00.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Nov 2024 03:00:33 -0800 (PST) From: Breno Leitao Date: Thu, 14 Nov 2024 03:00:12 -0800 Subject: [PATCH net-next v3 2/2] net: netpoll: flush skb pool during cleanup Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241114-skb_buffers_v2-v3-2-9be9f52a8b69@debian.org> References: <20241114-skb_buffers_v2-v3-0-9be9f52a8b69@debian.org> In-Reply-To: <20241114-skb_buffers_v2-v3-0-9be9f52a8b69@debian.org> To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Breno Leitao , max@kutsevol.com, davej@codemonkey.org.uk, vlad.wing@gmail.com X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1609; i=leitao@debian.org; h=from:subject:message-id; bh=CcG0jqnBBTmp6RbT3RFFybDyVcLS/vaHZeyk4jmq+Cs=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBnNdhMAIeFZEObOr+/04M/hYeWOnXWFCd9Fw27M 9NryO8Y6WKJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCZzXYTAAKCRA1o5Of/Hh3 bSH0D/9JIsJfmcJNz8WmCGRtzR0Yl77PDOE7wrcHA/4W70kEb5CdTAN6Hocr36XDykat85iUSvF a/3Mc0B2qnjHq403WfaUbLYXHEMYBOXtmj6wR78D1T2fiKxT1HNzp12Q0Qi5FR/KDhUSSb85j8y kQY7AaF27FgEGNdBodYKb2PPVH0grTIjAGxtE2M1oycFI+mLyi8i3AHZLYXnLMTPyHdnd2kR/TR BJgbyoOCy8EZh51D+cMp4ULGJrPWveP4lN32QCQRSRtsJ4U4v6fZG2bK1g7YnKVCbfHitoQXlHx wGZdZFPbDHs+Flcy+gFZjCqN+t7EvEaCREdMUU7AhzY+1pUBKSe3yLztfnmp2XSJu/e6nyS0Rtm vx0aZsUyhooW3W0GbwNAwLjuMoTuVccy5IHNWPluAVx+bl5BBnSJnZOvBpJYVS01JU2Ivt2q2kl pDUnynvi7LqxqP14tDi1gXyAVYd916k0SobKMUBjvmBg2qUYFfSdfJdsghTLSUDGO4jJnJGq9MG 7XgXE7tzPZsPz7ufX3NOM3McFDZzA2gAyb1Nk5gVPgVRlyXf++StwBuvjnru6AhZoRjetv4DRaD 61tp2Kzzvyt/xrmkl9t7wGoTORR/C5kNIYMJIPIFgK09QGzaUw2s5traGJeMrdfgNUAh2psbfO8 4ekpO1wSOAeiYSw== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D The netpoll subsystem maintains a pool of 32 pre-allocated SKBs per instance, but these SKBs are not freed when the netpoll user is brought down. This leads to memory waste as these buffers remain allocated but unused. Add skb_pool_flush() to properly clean up these SKBs when netconsole is terminated, improving memory efficiency. Signed-off-by: Breno Leitao --- net/core/netpoll.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/net/core/netpoll.c b/net/core/netpoll.c index 719c9aae845fbeb6f5b53a2bef675d3cb8cd44a7..00e1e4a329022ddcef32d72f182= 8acaf58cc94fa 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -531,6 +531,14 @@ static int netpoll_parse_ip_addr(const char *str, unio= n inet_addr *addr) return -1; } =20 +static void skb_pool_flush(struct netpoll *np) +{ + struct sk_buff_head *skb_pool; + + skb_pool =3D &np->skb_pool; + skb_queue_purge_reason(skb_pool, SKB_CONSUMED); +} + int netpoll_parse_options(struct netpoll *np, char *opt) { char *cur=3Dopt, *delim; @@ -779,10 +787,12 @@ int netpoll_setup(struct netpoll *np) =20 err =3D __netpoll_setup(np, ndev); if (err) - goto put; + goto flush; rtnl_unlock(); return 0; =20 +flush: + skb_pool_flush(np); put: DEBUG_NET_WARN_ON_ONCE(np->dev); if (ip_overwritten) @@ -830,6 +840,8 @@ void __netpoll_cleanup(struct netpoll *np) call_rcu(&npinfo->rcu, rcu_cleanup_netpoll_info); } else RCU_INIT_POINTER(np->dev->npinfo, NULL); + + skb_pool_flush(np); } EXPORT_SYMBOL_GPL(__netpoll_cleanup); =20 --=20 2.43.5