From patchwork Sun Nov 17 06:50:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 1196306 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: incoming-bpf@patchwork.ozlabs.org Delivered-To: patchwork-incoming-bpf@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=bpf-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=fb.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=fb.com header.i=@fb.com header.b="rr9w0ZLZ"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 47G2m75ljqz9s7T for ; Sun, 17 Nov 2019 17:50:47 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725867AbfKQGuq (ORCPT ); Sun, 17 Nov 2019 01:50:46 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:63860 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725880AbfKQGuq (ORCPT ); Sun, 17 Nov 2019 01:50:46 -0500 Received: from pps.filterd (m0109334.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id xAH6mpcY011015 for ; Sat, 16 Nov 2019 22:50:44 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=facebook; bh=lOYiIw2L00Jmt7jzpWQlfvJwmchRN5NMUOO5xe6Lo8M=; b=rr9w0ZLZqLU7QiUisffMzDjIyK1iHWlecvGwNT0VfwzXVjP3qvzFuZMnTBNMtd2MjtYX XV0LEMXJt/F5w0ir7jxyycNr1Z/SY/3+HHnqwNr2+5Nk5CfD/uiAatvfE2xG6JNOabuI HuF9gN89RfB4AHYhb/SlgAtxb2WQYZI4IY4= Received: from mail.thefacebook.com (mailout.thefacebook.com [199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 2wah9uyrmx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT) for ; Sat, 16 Nov 2019 22:50:44 -0800 Received: from 2401:db00:12:9028:face:0:29:0 (2620:10d:c081:10::13) by mail.thefacebook.com (2620:10d:c081:35::129) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA) id 15.1.1713.5; Sat, 16 Nov 2019 22:50:43 -0800 Received: by devbig012.ftw2.facebook.com (Postfix, from userid 137359) id CD5012EC18AA; Sat, 16 Nov 2019 22:50:42 -0800 (PST) Smtp-Origin-Hostprefix: devbig From: Andrii Nakryiko Smtp-Origin-Hostname: devbig012.ftw2.facebook.com To: , , , CC: , , Andrii Nakryiko Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH v5 bpf-next 2/5] bpf: convert bpf_prog refcnt to atomic64_t Date: Sat, 16 Nov 2019 22:50:32 -0800 Message-ID: <20191117065035.202462-3-andriin@fb.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191117065035.202462-1-andriin@fb.com> References: <20191117065035.202462-1-andriin@fb.com> X-FB-Internal: Safe MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95, 18.0.572 definitions=2019-11-17_01:2019-11-15, 2019-11-16 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 impostorscore=0 mlxlogscore=999 adultscore=0 bulkscore=0 mlxscore=0 lowpriorityscore=0 clxscore=1015 suspectscore=25 phishscore=0 spamscore=0 priorityscore=1501 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1911170063 X-FB-Internal: deliver Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Similarly to bpf_map's refcnt/usercnt, convert bpf_prog's refcnt to atomic64 and remove artificial 32k limit. This allows to make bpf_prog's refcounting non-failing, simplifying logic of users of bpf_prog_add/bpf_prog_inc. Validated compilation by running allyesconfig kernel build. Suggested-by: Daniel Borkmann Signed-off-by: Andrii Nakryiko --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 9 ++---- .../net/ethernet/cavium/thunder/nicvf_main.c | 9 ++---- .../net/ethernet/freescale/dpaa2/dpaa2-eth.c | 7 ++--- .../net/ethernet/mellanox/mlx4/en_netdev.c | 24 ++++----------- .../net/ethernet/mellanox/mlx5/core/en_main.c | 18 ++++------- drivers/net/ethernet/qlogic/qede/qede_main.c | 8 ++--- drivers/net/virtio_net.c | 7 ++--- include/linux/bpf.h | 13 ++++---- kernel/bpf/inode.c | 5 ++-- kernel/bpf/syscall.c | 30 ++++++------------- kernel/events/core.c | 7 ++--- 11 files changed, 40 insertions(+), 97 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index c07172429c70..9da4fbee3cf7 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -3171,13 +3171,8 @@ static int bnxt_init_one_rx_ring(struct bnxt *bp, int ring_nr) bnxt_init_rxbd_pages(ring, type); if (BNXT_RX_PAGE_MODE(bp) && bp->xdp_prog) { - rxr->xdp_prog = bpf_prog_add(bp->xdp_prog, 1); - if (IS_ERR(rxr->xdp_prog)) { - int rc = PTR_ERR(rxr->xdp_prog); - - rxr->xdp_prog = NULL; - return rc; - } + bpf_prog_add(bp->xdp_prog, 1); + rxr->xdp_prog = bp->xdp_prog; } prod = rxr->rx_prod; for (i = 0; i < bp->rx_ring_size; i++) { diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c index 40a44dcb3d9b..f28409279ea4 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c +++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c @@ -1876,13 +1876,8 @@ static int nicvf_xdp_setup(struct nicvf *nic, struct bpf_prog *prog) if (nic->xdp_prog) { /* Attach BPF program */ - nic->xdp_prog = bpf_prog_add(nic->xdp_prog, nic->rx_queues - 1); - if (!IS_ERR(nic->xdp_prog)) { - bpf_attached = true; - } else { - ret = PTR_ERR(nic->xdp_prog); - nic->xdp_prog = NULL; - } + bpf_prog_add(nic->xdp_prog, nic->rx_queues - 1); + bpf_attached = true; } /* Calculate Tx queues needed for XDP and network stack */ diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c index c26c0a7cbb6b..acc56606d3a5 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c @@ -1807,11 +1807,8 @@ static int setup_xdp(struct net_device *dev, struct bpf_prog *prog) if (prog && !xdp_mtu_valid(priv, dev->mtu)) return -EINVAL; - if (prog) { - prog = bpf_prog_add(prog, priv->num_channels); - if (IS_ERR(prog)) - return PTR_ERR(prog); - } + if (prog) + bpf_prog_add(prog, priv->num_channels); up = netif_running(dev); need_update = (!!priv->xdp_prog != !!prog); diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c index 40ec5acf79c0..d4697beeacc2 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c @@ -2286,11 +2286,7 @@ int mlx4_en_try_alloc_resources(struct mlx4_en_priv *priv, lockdep_is_held(&priv->mdev->state_lock)); if (xdp_prog && carry_xdp_prog) { - xdp_prog = bpf_prog_add(xdp_prog, tmp->rx_ring_num); - if (IS_ERR(xdp_prog)) { - mlx4_en_free_resources(tmp); - return PTR_ERR(xdp_prog); - } + bpf_prog_add(xdp_prog, tmp->rx_ring_num); for (i = 0; i < tmp->rx_ring_num; i++) rcu_assign_pointer(tmp->rx_ring[i]->xdp_prog, xdp_prog); @@ -2782,11 +2778,9 @@ static int mlx4_xdp_set(struct net_device *dev, struct bpf_prog *prog) * program for a new one. */ if (priv->tx_ring_num[TX_XDP] == xdp_ring_num) { - if (prog) { - prog = bpf_prog_add(prog, priv->rx_ring_num - 1); - if (IS_ERR(prog)) - return PTR_ERR(prog); - } + if (prog) + bpf_prog_add(prog, priv->rx_ring_num - 1); + mutex_lock(&mdev->state_lock); for (i = 0; i < priv->rx_ring_num; i++) { old_prog = rcu_dereference_protected( @@ -2807,13 +2801,8 @@ static int mlx4_xdp_set(struct net_device *dev, struct bpf_prog *prog) if (!tmp) return -ENOMEM; - if (prog) { - prog = bpf_prog_add(prog, priv->rx_ring_num - 1); - if (IS_ERR(prog)) { - err = PTR_ERR(prog); - goto out; - } - } + if (prog) + bpf_prog_add(prog, priv->rx_ring_num - 1); mutex_lock(&mdev->state_lock); memcpy(&new_prof, priv->prof, sizeof(struct mlx4_en_port_profile)); @@ -2862,7 +2851,6 @@ static int mlx4_xdp_set(struct net_device *dev, struct bpf_prog *prog) unlock_out: mutex_unlock(&mdev->state_lock); -out: kfree(tmp); return err; } diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c index 772bfdbdeb9c..1d4a66fb466a 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c @@ -408,12 +408,9 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c, rq->stats = &c->priv->channel_stats[c->ix].rq; INIT_WORK(&rq->recover_work, mlx5e_rq_err_cqe_work); - rq->xdp_prog = params->xdp_prog ? bpf_prog_inc(params->xdp_prog) : NULL; - if (IS_ERR(rq->xdp_prog)) { - err = PTR_ERR(rq->xdp_prog); - rq->xdp_prog = NULL; - goto err_rq_wq_destroy; - } + if (params->xdp_prog) + bpf_prog_inc(params->xdp_prog); + rq->xdp_prog = params->xdp_prog; rq_xdp_ix = rq->ix; if (xsk) @@ -4406,16 +4403,11 @@ static int mlx5e_xdp_set(struct net_device *netdev, struct bpf_prog *prog) /* no need for full reset when exchanging programs */ reset = (!priv->channels.params.xdp_prog || !prog); - if (was_opened && !reset) { + if (was_opened && !reset) /* num_channels is invariant here, so we can take the * batched reference right upfront. */ - prog = bpf_prog_add(prog, priv->channels.num); - if (IS_ERR(prog)) { - err = PTR_ERR(prog); - goto unlock; - } - } + bpf_prog_add(prog, priv->channels.num); if (was_opened && reset) { struct mlx5e_channels new_channels = {}; diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c index 8d1c208f778f..1e26964fe4e9 100644 --- a/drivers/net/ethernet/qlogic/qede/qede_main.c +++ b/drivers/net/ethernet/qlogic/qede/qede_main.c @@ -2107,12 +2107,8 @@ static int qede_start_queues(struct qede_dev *edev, bool clear_stats) if (rc) goto out; - fp->rxq->xdp_prog = bpf_prog_add(edev->xdp_prog, 1); - if (IS_ERR(fp->rxq->xdp_prog)) { - rc = PTR_ERR(fp->rxq->xdp_prog); - fp->rxq->xdp_prog = NULL; - goto out; - } + bpf_prog_add(edev->xdp_prog, 1); + fp->rxq->xdp_prog = edev->xdp_prog; } if (fp->type & QEDE_FASTPATH_TX) { diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 5a635f028bdc..4d7d5434cc5d 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -2445,11 +2445,8 @@ static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, if (!prog && !old_prog) return 0; - if (prog) { - prog = bpf_prog_add(prog, vi->max_queue_pairs - 1); - if (IS_ERR(prog)) - return PTR_ERR(prog); - } + if (prog) + bpf_prog_add(prog, vi->max_queue_pairs - 1); /* Make sure NAPI is not using any XDP TX queues for RX. */ if (netif_running(dev)) { diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 34a34445c009..fb606dc61a3a 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -485,7 +485,7 @@ struct bpf_func_info_aux { }; struct bpf_prog_aux { - atomic_t refcnt; + atomic64_t refcnt; u32 used_map_cnt; u32 max_ctx_offset; u32 max_pkt_offset; @@ -770,9 +770,9 @@ extern const struct bpf_verifier_ops xdp_analyzer_ops; struct bpf_prog *bpf_prog_get(u32 ufd); struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type, bool attach_drv); -struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, int i); +void bpf_prog_add(struct bpf_prog *prog, int i); void bpf_prog_sub(struct bpf_prog *prog, int i); -struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog); +void bpf_prog_inc(struct bpf_prog *prog); struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); void bpf_prog_put(struct bpf_prog *prog); int __bpf_prog_charge(struct user_struct *user, u32 pages); @@ -912,10 +912,8 @@ static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, return ERR_PTR(-EOPNOTSUPP); } -static inline struct bpf_prog * __must_check bpf_prog_add(struct bpf_prog *prog, - int i) +static inline void bpf_prog_add(struct bpf_prog *prog, int i) { - return ERR_PTR(-EOPNOTSUPP); } static inline void bpf_prog_sub(struct bpf_prog *prog, int i) @@ -926,9 +924,8 @@ static inline void bpf_prog_put(struct bpf_prog *prog) { } -static inline struct bpf_prog * __must_check bpf_prog_inc(struct bpf_prog *prog) +static inline void bpf_prog_inc(struct bpf_prog *prog) { - return ERR_PTR(-EOPNOTSUPP); } static inline struct bpf_prog *__must_check diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c index 2f17f24258dc..ecf42bec38c0 100644 --- a/kernel/bpf/inode.c +++ b/kernel/bpf/inode.c @@ -31,7 +31,7 @@ static void *bpf_any_get(void *raw, enum bpf_type type) { switch (type) { case BPF_TYPE_PROG: - raw = bpf_prog_inc(raw); + bpf_prog_inc(raw); break; case BPF_TYPE_MAP: bpf_map_inc_with_uref(raw); @@ -534,7 +534,8 @@ static struct bpf_prog *__get_prog_inode(struct inode *inode, enum bpf_prog_type if (!bpf_prog_get_ok(prog, &type, false)) return ERR_PTR(-EINVAL); - return bpf_prog_inc(prog); + bpf_prog_inc(prog); + return prog; } struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type) diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 20030751b7a2..52fe4bacb330 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1339,7 +1339,7 @@ static void __bpf_prog_put_noref(struct bpf_prog *prog, bool deferred) static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock) { - if (atomic_dec_and_test(&prog->aux->refcnt)) { + if (atomic64_dec_and_test(&prog->aux->refcnt)) { perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0); /* bpf_prog_free_id() must be called first */ bpf_prog_free_id(prog, do_idr_lock); @@ -1445,16 +1445,9 @@ static struct bpf_prog *____bpf_prog_get(struct fd f) return f.file->private_data; } -/* prog's refcnt limit */ -#define BPF_MAX_REFCNT 32768 - -struct bpf_prog *bpf_prog_add(struct bpf_prog *prog, int i) +void bpf_prog_add(struct bpf_prog *prog, int i) { - if (atomic_add_return(i, &prog->aux->refcnt) > BPF_MAX_REFCNT) { - atomic_sub(i, &prog->aux->refcnt); - return ERR_PTR(-EBUSY); - } - return prog; + atomic64_add(i, &prog->aux->refcnt); } EXPORT_SYMBOL_GPL(bpf_prog_add); @@ -1465,13 +1458,13 @@ void bpf_prog_sub(struct bpf_prog *prog, int i) * path holds a reference to the program, thus atomic_sub() can * be safely used in such cases! */ - WARN_ON(atomic_sub_return(i, &prog->aux->refcnt) == 0); + WARN_ON(atomic64_sub_return(i, &prog->aux->refcnt) == 0); } EXPORT_SYMBOL_GPL(bpf_prog_sub); -struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog) +void bpf_prog_inc(struct bpf_prog *prog) { - return bpf_prog_add(prog, 1); + atomic64_inc(&prog->aux->refcnt); } EXPORT_SYMBOL_GPL(bpf_prog_inc); @@ -1480,12 +1473,7 @@ struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog) { int refold; - refold = atomic_fetch_add_unless(&prog->aux->refcnt, 1, 0); - - if (refold >= BPF_MAX_REFCNT) { - __bpf_prog_put(prog, false); - return ERR_PTR(-EBUSY); - } + refold = atomic64_fetch_add_unless(&prog->aux->refcnt, 1, 0); if (!refold) return ERR_PTR(-ENOENT); @@ -1523,7 +1511,7 @@ static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type, goto out; } - prog = bpf_prog_inc(prog); + bpf_prog_inc(prog); out: fdput(f); return prog; @@ -1714,7 +1702,7 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr) prog->orig_prog = NULL; prog->jited = 0; - atomic_set(&prog->aux->refcnt, 1); + atomic64_set(&prog->aux->refcnt, 1); prog->gpl_compatible = is_gpl ? 1 : 0; if (bpf_prog_is_dev_bound(prog->aux)) { diff --git a/kernel/events/core.c b/kernel/events/core.c index aec8dba2bea4..73c616876597 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -10477,12 +10477,9 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu, context = parent_event->overflow_handler_context; #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_EVENT_TRACING) if (overflow_handler == bpf_overflow_handler) { - struct bpf_prog *prog = bpf_prog_inc(parent_event->prog); + struct bpf_prog *prog = parent_event->prog; - if (IS_ERR(prog)) { - err = PTR_ERR(prog); - goto err_ns; - } + bpf_prog_inc(prog); event->prog = prog; event->orig_overflow_handler = parent_event->orig_overflow_handler;