From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F1CE5337BA5 for ; Thu, 5 Feb 2026 22:29:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770330562; cv=none; b=IrAKf0Elz95t9QWDazYjxA0Q18YxQ10NUWYsId8m3MmT53rlS8ms/7tb08YyI+rw5BPoj27etgdOq7aJDmUxSciPCAzN7WxYpOV6tSbu7xcfqSQdWjPkcBvxXiN/2DNGVy5wPVH0N5Pj4Kc0RC7/cXOxlmUJPI79PWPZTTCfG2M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770330562; c=relaxed/simple; bh=9nZ6jpC7RDqDEJq2NNVLElMp/GWAaSXmG7B6xW+5CS0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gE6giwPriid7cjOwAHJs55bbrvrqNw+4dujghLkEsmeMZaVmdmv01nS2pZC6fdxVMuAinlQd2zRTb8DjU6BLjNl9/34H0UGFAfbCeMjPeswgFtIKn2lIf/WMX1Fn/AX2BKUx4PF2+qSxTtPE4SXEhhaSoE1HSA+myr61Zy+SkC8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Ur1pz1uM; arc=none smtp.client-ip=209.85.214.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Ur1pz1uM" Received: by mail-pl1-f173.google.com with SMTP id d9443c01a7336-2a9296b3926so11807785ad.1 for ; Thu, 05 Feb 2026 14:29:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1770330561; x=1770935361; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=FFAdrsbHgzRyyWJg1DcmckeIQG/iHVdwXXcQIChXPXA=; b=Ur1pz1uM9ECo+AqkibUJOjdiseK23MBsE7p/sJxK78RDcucAwwbcKKT3o5SA9M5eYs ZcyGgKMImRqNgovVZVliKAHtvb97ISKtyOnyjmw/nKuiTnGw7IPRr+HoCB9PRScpvcxs g9+t20PKYrs2bjznKn3BGn4nNfjwF7ss/QGOu/0gNXMFx4OsIJ/NPQXakvwzcZa1vp5r yD+SReT9uUQL28BpN3Nh/XiK5hkgMQ4ZuTLiYqRkk/ugsCppzCrZr3HDGwxpMcqQaXSH f0Sj0pLplYLUPr3mmnr4rCjhhBY/Jz5LisE8nUKTtSkh60Ks6kTsHbyNRAO0INSx0FMG DURA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770330561; x=1770935361; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=FFAdrsbHgzRyyWJg1DcmckeIQG/iHVdwXXcQIChXPXA=; b=QyjxFYRJO6MSX9TGWF+iO9Vjcv11nCi7M3c+z/+aUuGJ+yXwMLlz9B+9qnn8a3okZe OZh90RZGeu2x31P9IiZsM6o+ON9BOMolSGyP/zI97Kr5gedpxnu1xjL1lTRhja9ucZo0 81A+xvah9lcTsCt9wUQTVdVu0lZz/BOI8H9FNS9M7SY9YzF+HgfEL5TGyNTrTFTrWQAO 15UH6bzCUmeWoTWe4hkA3rbOqTuEXfP01KFUsFnPiWzi9++RAcPf+vpzhUKI/cv/OO9Z 5Z24JnGHpqIjx5qJ/U/Zkd8W7I7yEdLbRWC5IOH3Iz7mtiYcJKG7Mg4oi+B5fRnpUB+d VulQ== X-Gm-Message-State: AOJu0YwscqZsNgX+ovsXhusYDI9veWvp2N9p5V7/DGnOeKDyR7Df/vXf weaXdQmmzA4jGWvjzFYrUwa+T1WXH45Xx6SWdQfFnSU+zSIAa1NbBIxX X-Gm-Gg: AZuq6aJPATTo6kollALLEEcVxK8Bl2NCy+5PRrDT0d+0JOMwG4kZGb1eTayfyp6O3d0 rf9ie+d1cJuMGN2caFcpfIFrWFDgTSoaxC8Do1qLCv1Wked+1aAbW49wBgZyqDxkA/aCBJh9ubo x5QvKqVF4k1qnOmSHzFtHvrNpvjnb+c6qfILwsE1TzmB46+eW62eMbWTf3NSxmRLv2FgT64nUF3 TjJopAAi8DJgTa5byKc2Vo0hxsGgD4VwSm6RwYEw+CFoegWU99l4wiVQl6l/k2mTGi+HbsH6EqB k6xgIi1JTf+0xf/dZqvFfYwZ7UJZ5sqDblCLcBsvLlYR0XKbKha5zL7vOitfFiUU10ejAE4B2wC y9VGMEuEU4C50b0wgogJBuizpSUCF4hhZxms7wyw1QOMBlsUT12bX9QUiSFd3H5SSq7VwUBB1A6 w5wQ== X-Received: by 2002:a17:903:298d:b0:2a9:4e8:ae45 with SMTP id d9443c01a7336-2a95167e079mr6135145ad.27.1770330561270; Thu, 05 Feb 2026 14:29:21 -0800 (PST) Received: from localhost ([2a03:2880:ff:58::]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-354b305f6efsm246562a91.2.2026.02.05.14.29.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Feb 2026 14:29:20 -0800 (PST) From: Amery Hung To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, alexei.starovoitov@gmail.com, andrii@kernel.org, daniel@iogearbox.net, memxor@gmail.com, martin.lau@kernel.org, kpsingh@kernel.org, yonghong.song@linux.dev, song@kernel.org, haoluo@google.com, ameryhung@gmail.com, kernel-team@meta.com Subject: [PATCH bpf-next v7 03/17] bpf: Convert bpf_selem_link_map to failable Date: Thu, 5 Feb 2026 14:29:01 -0800 Message-ID: <20260205222916.1788211-4-ameryhung@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260205222916.1788211-1-ameryhung@gmail.com> References: <20260205222916.1788211-1-ameryhung@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit To prepare for changing bpf_local_storage_map_bucket::lock to rqspinlock, convert bpf_selem_link_map() to failable. It still always succeeds and returns 0 until the change happens. No functional change. Signed-off-by: Amery Hung --- include/linux/bpf_local_storage.h | 6 +++--- kernel/bpf/bpf_local_storage.c | 8 +++++--- net/core/bpf_sk_storage.c | 9 ++++++++- 3 files changed, 16 insertions(+), 7 deletions(-) diff --git a/include/linux/bpf_local_storage.h b/include/linux/bpf_local_storage.h index 2638487425b8..709506e982a6 100644 --- a/include/linux/bpf_local_storage.h +++ b/include/linux/bpf_local_storage.h @@ -178,9 +178,9 @@ void bpf_selem_link_storage_nolock(struct bpf_local_storage *local_storage, void bpf_selem_unlink(struct bpf_local_storage_elem *selem, bool reuse_now); -void bpf_selem_link_map(struct bpf_local_storage_map *smap, - struct bpf_local_storage *local_storage, - struct bpf_local_storage_elem *selem); +int bpf_selem_link_map(struct bpf_local_storage_map *smap, + struct bpf_local_storage *local_storage, + struct bpf_local_storage_elem *selem); struct bpf_local_storage_elem * bpf_selem_alloc(struct bpf_local_storage_map *smap, void *owner, void *value, diff --git a/kernel/bpf/bpf_local_storage.c b/kernel/bpf/bpf_local_storage.c index 6fa71502c7d7..2f94ca4a4475 100644 --- a/kernel/bpf/bpf_local_storage.c +++ b/kernel/bpf/bpf_local_storage.c @@ -365,9 +365,9 @@ static void bpf_selem_unlink_map_nolock(struct bpf_local_storage_elem *selem) hlist_del_init_rcu(&selem->map_node); } -void bpf_selem_link_map(struct bpf_local_storage_map *smap, - struct bpf_local_storage *local_storage, - struct bpf_local_storage_elem *selem) +int bpf_selem_link_map(struct bpf_local_storage_map *smap, + struct bpf_local_storage *local_storage, + struct bpf_local_storage_elem *selem) { struct bpf_local_storage_map_bucket *b; unsigned long flags; @@ -376,6 +376,8 @@ void bpf_selem_link_map(struct bpf_local_storage_map *smap, raw_spin_lock_irqsave(&b->lock, flags); hlist_add_head_rcu(&selem->map_node, &b->list); raw_spin_unlock_irqrestore(&b->lock, flags); + + return 0; } static void bpf_selem_link_map_nolock(struct bpf_local_storage_map_bucket *b, diff --git a/net/core/bpf_sk_storage.c b/net/core/bpf_sk_storage.c index e36273e4fcbd..0b85d8f2c17e 100644 --- a/net/core/bpf_sk_storage.c +++ b/net/core/bpf_sk_storage.c @@ -191,7 +191,14 @@ int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk) } if (new_sk_storage) { - bpf_selem_link_map(smap, new_sk_storage, copy_selem); + ret = bpf_selem_link_map(smap, new_sk_storage, copy_selem); + if (ret) { + bpf_selem_free(copy_selem, true); + atomic_sub(smap->elem_size, + &newsk->sk_omem_alloc); + bpf_map_put(map); + goto out; + } bpf_selem_link_storage_nolock(new_sk_storage, copy_selem); } else { ret = bpf_local_storage_alloc(newsk, smap, copy_selem, GFP_ATOMIC); -- 2.47.3