From patchwork Thu Nov 7 04:29:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geliang Tang X-Patchwork-Id: 13865806 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4A124BA2D for ; Thu, 7 Nov 2024 04:29:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730953765; cv=none; b=F1DCsNM3qP61xHbjfS9fgSG+G4T3/hr+reJoUhiW3Pfl3XJydaU8arpH91wFGVdU/g8PGS1P1tu8VqKWJqHEf4ul7wci02IRdOrdDWxImRb0XyYaIfH67sw9WJfnvK3Mamlk/IQlFLcP5olTmn93jjJtr4Vj+s5+NQXaHUJdwqQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730953765; c=relaxed/simple; bh=6jAeo9bgsyZFFUGuANsZ6laBPC4E8CX/YQCdXEnYE4w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=C6ZlIVa1SObR4NHSq9cZ0xsvGJ1PxaxG99f1vJ+1Lg8gnw2vV+Xo+JjpEZJ0+EUdKNbIkthpOQITpx5dV7eEOYR6vMYT5EFRCTMHOOB4EodPLK7iUaSU0a3txXJBcIB+QRhStREk2xCEuKe69UoV3K/wDoykgRcgu2POeY13esE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rieIypk/; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="rieIypk/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A3AA6C4CECC; Thu, 7 Nov 2024 04:29:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730953764; bh=6jAeo9bgsyZFFUGuANsZ6laBPC4E8CX/YQCdXEnYE4w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rieIypk/vMgh9tsvVMfLveYS1mFSJIzd7lDzEIAEvVS6K1IWfw8kVBkk4I8bOLG9o huUVtkdKb4g+Afr+TVlsYCp/5VH/t1o7k6Dn3hQiQLxCwVID1JPuWfCwe5N6XiuMRx hOAlvg/WNPGOoYaa1NacroLa4wgXgywvOsOmfL883oqSWHtDsmSAtO08xhJsKUTXtx zGKErftEAkjYYBagYzZcKK4lHXG2CiDkkM+1cA1m1A6ymaHiJvuPxsSSR9s2LEac6I 0QGjwNVxs32TgC7IzeCAWJT92rAtFu0ZrUApMsK1iykpekcbfggDPi606cGTegXhYA AGpg3eKTJyKFQ== From: Geliang Tang To: mptcp@lists.linux.dev Cc: Geliang Tang Subject: [PATCH mptcp-next v3 3/5] bpf: Add mptcp_userspace_pm_addr bpf_iter Date: Thu, 7 Nov 2024 12:29:08 +0800 Message-ID: X-Mailer: git-send-email 2.45.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Geliang Tang Just like the mptcp_subflow bpf_iter used to implement the MPTCP BPF packet scheduler, another bpf_iter is also needed, named mptcp_userspace_pm_addr, to traverse all address entries on userspace_pm_local_addr_list of an MPTCP socket for implementing the MPTCP BPF path manager. In kernel space, we walk this list like this: mptcp_for_each_userspace_pm_addr(msk, entry) kfunc(entry); With the mptcp_userspace_pm_addr bpf_iter, bpf_for_each() can be used to do the same thing in BPF program: bpf_for_each(mptcp_userspace_pm_addr, entry, msk) kfunc(entry); This bpf_iter should be invoked under holding the msk pm lock, so use lockdep_assert_held() to assert the lock is holding. Signed-off-by: Geliang Tang --- net/mptcp/bpf.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/net/mptcp/bpf.c b/net/mptcp/bpf.c index e9db856972cb..2c0701f5b0c9 100644 --- a/net/mptcp/bpf.c +++ b/net/mptcp/bpf.c @@ -214,6 +214,15 @@ struct bpf_iter_mptcp_subflow_kern { struct list_head *pos; } __aligned(8); +struct bpf_iter_mptcp_userspace_pm_addr { + __u64 __opaque[2]; +} __aligned(8); + +struct bpf_iter_mptcp_userspace_pm_addr_kern { + struct mptcp_sock *msk; + struct list_head *pos; +} __aligned(8); + __bpf_kfunc_start_defs(); __bpf_kfunc static struct mptcp_sock *bpf_mptcp_sk(struct sock *sk) @@ -266,6 +275,40 @@ bpf_iter_mptcp_subflow_destroy(struct bpf_iter_mptcp_subflow *it) { } +__bpf_kfunc static int +bpf_iter_mptcp_userspace_pm_addr_new(struct bpf_iter_mptcp_userspace_pm_addr *it, + struct mptcp_sock *msk) +{ + struct bpf_iter_mptcp_userspace_pm_addr_kern *kit = (void *)it; + + kit->msk = msk; + if (!msk) + return -EINVAL; + + lockdep_assert_held(&msk->pm.lock); + + kit->pos = &msk->pm.userspace_pm_local_addr_list; + return 0; +} + +__bpf_kfunc static struct mptcp_pm_addr_entry * +bpf_iter_mptcp_userspace_pm_addr_next(struct bpf_iter_mptcp_userspace_pm_addr *it) +{ + struct bpf_iter_mptcp_userspace_pm_addr_kern *kit = (void *)it; + + if (!kit->msk || list_is_last(kit->pos, + &kit->msk->pm.userspace_pm_local_addr_list)) + return NULL; + + kit->pos = kit->pos->next; + return list_entry(kit->pos, struct mptcp_pm_addr_entry, list); +} + +__bpf_kfunc static void +bpf_iter_mptcp_userspace_pm_addr_destroy(struct bpf_iter_mptcp_userspace_pm_addr *it) +{ +} + __bpf_kfunc static struct mptcp_sock *bpf_mptcp_sock_acquire(struct mptcp_sock *msk) { @@ -305,6 +348,9 @@ BTF_ID_FLAGS(func, bpf_mptcp_subflow_tcp_sock) BTF_ID_FLAGS(func, bpf_iter_mptcp_subflow_new, KF_ITER_NEW | KF_TRUSTED_ARGS) BTF_ID_FLAGS(func, bpf_iter_mptcp_subflow_next, KF_ITER_NEXT | KF_RET_NULL) BTF_ID_FLAGS(func, bpf_iter_mptcp_subflow_destroy, KF_ITER_DESTROY) +BTF_ID_FLAGS(func, bpf_iter_mptcp_userspace_pm_addr_new, KF_ITER_NEW | KF_TRUSTED_ARGS) +BTF_ID_FLAGS(func, bpf_iter_mptcp_userspace_pm_addr_next, KF_ITER_NEXT | KF_RET_NULL) +BTF_ID_FLAGS(func, bpf_iter_mptcp_userspace_pm_addr_destroy, KF_ITER_DESTROY) BTF_ID_FLAGS(func, bpf_mptcp_sock_acquire, KF_ACQUIRE | KF_RET_NULL) BTF_ID_FLAGS(func, bpf_mptcp_sock_release, KF_RELEASE) BTF_KFUNCS_END(bpf_mptcp_common_kfunc_ids)