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[2a03:2880:30ff:73::face:b00c]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9ee0defb61sm108826666b.150.2024.11.07.07.57.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Nov 2024 07:57:15 -0800 (PST) From: Breno Leitao Date: Thu, 07 Nov 2024 07:57:06 -0800 Subject: [PATCH net-next v2 1/2] net: netpoll: Individualize the skb pool 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: <20241107-skb_buffers_v2-v2-1-288c6264ba4f@debian.org> References: <20241107-skb_buffers_v2-v2-0-288c6264ba4f@debian.org> In-Reply-To: <20241107-skb_buffers_v2-v2-0-288c6264ba4f@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 X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3542; i=leitao@debian.org; h=from:subject:message-id; bh=l/0wZIy7SkdSRdFTGTTWstgdulRmA7dbmH3XYkTeIRU=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBnLONZVOc3C8bsORLiLKniO8jahyMHqRR4634kF KH5CID95xaJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCZyzjWQAKCRA1o5Of/Hh3 bRvND/9JDVObUiBBbAkmjSkcfz+vTq0fof9B/MUryFzYByklPMc8Svu2T4jmc2IwSraWH5wKlWQ xAgpn4j6+CtLwj5FSRiGtJ1yIh/70cR3kyify7e1m+Hx9xFU8ZtiJq3tshxm5p4sX5KJ+dbmeQm bkZ9It7XgBiuzLRaijlMtYi/oVExw8USNDbqZDfa+L1ibXKoo5ufA3ef6HyYo2tttQ2YjWK1K7P mGEBmbWG8uuKxv9wajBdgTl0YiSLAFQflT+GSq7Ta3V20bE7bjXUePO48Bc4pQOqpRD1FsEpe9G kJF8Y7JDg83SlHu2f0OlKLnVXsa542AOt6j7/yqHNKkYQ4aLTFLvEZCVvBzCQnNEz5dT/wa5MDO ZkBjqFx7fVufOvQl7PYTiPpAAwuDOtcC8eV/3j+KTgSfxakhamwyaIZU4Rhc/oGaGRoh7gRMcVH rGVOiFfKTAvlL0sq6QgMNQBCzyK4a7VZiYBBpRbtZRq1qyR5oWm0QhcKRoVB7UNjg2kyIBSwzMj hrMfEZUm1q4OG6IOKQhocqRiUmDOwEZ+UkS3HtlAXp0jsvqj5kkEbHnnaItyq8ENuZH60Hf1k/X XDyiSayAwzj7QvoiGH0f1yY0X+jqbyLTi6ZvZPsqSxWjPoM8Emofn19zAWzl8VUk6nVBkjy22QJ QWXbu3ixtS6Ijug== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D The current implementation of the netpoll system uses a global skb pool, which can lead to inefficient memory usage and waste when targets are disabled or no longer in use. This can result in a significant amount of memory being unnecessarily allocated and retained, potentially causing performance issues and limiting the availability of resources for other system components. Modify the netpoll system to assign a skb pool to each target instead of using a global one. This approach allows for more fine-grained control over memory allocation and deallocation, ensuring that resources are only allocated and retained as needed. Signed-off-by: Breno Leitao --- include/linux/netpoll.h | 1 + net/core/netpoll.c | 31 +++++++++++++------------------ 2 files changed, 14 insertions(+), 18 deletions(-) diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h index cd4e28db0cbd77572a579aff2067b5864d1a904a..77635b885c18b7d405642c2e7f3= 9f5ff2c7d469d 100644 --- a/include/linux/netpoll.h +++ b/include/linux/netpoll.h @@ -32,6 +32,7 @@ struct netpoll { bool ipv6; u16 local_port, remote_port; u8 remote_mac[ETH_ALEN]; + struct sk_buff_head skb_pool; }; =20 struct netpoll_info { diff --git a/net/core/netpoll.c b/net/core/netpoll.c index 94b7f07a952fff3358cc609fb29de33ae8ae8626..719c9aae845fbeb6f5b53a2bef6= 75d3cb8cd44a7 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -45,9 +45,6 @@ =20 #define MAX_UDP_CHUNK 1460 #define MAX_SKBS 32 - -static struct sk_buff_head skb_pool; - #define USEC_PER_POLL 50 =20 #define MAX_SKB_SIZE \ @@ -234,20 +231,23 @@ void netpoll_poll_enable(struct net_device *dev) up(&ni->dev_lock); } =20 -static void refill_skbs(void) +static void refill_skbs(struct netpoll *np) { + struct sk_buff_head *skb_pool; struct sk_buff *skb; unsigned long flags; =20 - spin_lock_irqsave(&skb_pool.lock, flags); - while (skb_pool.qlen < MAX_SKBS) { + skb_pool =3D &np->skb_pool; + + spin_lock_irqsave(&skb_pool->lock, flags); + while (skb_pool->qlen < MAX_SKBS) { skb =3D alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); if (!skb) break; =20 - __skb_queue_tail(&skb_pool, skb); + __skb_queue_tail(skb_pool, skb); } - spin_unlock_irqrestore(&skb_pool.lock, flags); + spin_unlock_irqrestore(&skb_pool->lock, flags); } =20 static void zap_completion_queue(void) @@ -284,12 +284,12 @@ static struct sk_buff *find_skb(struct netpoll *np, i= nt len, int reserve) struct sk_buff *skb; =20 zap_completion_queue(); - refill_skbs(); + refill_skbs(np); repeat: =20 skb =3D alloc_skb(len, GFP_ATOMIC); if (!skb) - skb =3D skb_dequeue(&skb_pool); + skb =3D skb_dequeue(&np->skb_pool); =20 if (!skb) { if (++count < 10) { @@ -673,6 +673,8 @@ int netpoll_setup(struct netpoll *np) struct in_device *in_dev; int err; =20 + skb_queue_head_init(&np->skb_pool); + rtnl_lock(); if (np->dev_name[0]) { struct net *net =3D current->nsproxy->net_ns; @@ -773,7 +775,7 @@ int netpoll_setup(struct netpoll *np) } =20 /* fill up the skb queue */ - refill_skbs(); + refill_skbs(np); =20 err =3D __netpoll_setup(np, ndev); if (err) @@ -792,13 +794,6 @@ int netpoll_setup(struct netpoll *np) } EXPORT_SYMBOL(netpoll_setup); =20 -static int __init netpoll_init(void) -{ - skb_queue_head_init(&skb_pool); - return 0; -} -core_initcall(netpoll_init); - static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head) { struct netpoll_info *npinfo =3D --=20 2.43.5