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Miller" , Nicolai Stange , Greg KH , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Chun-Yi Lee Subject: [RFC PATCH 1/2] aoe: add reference count in aoeif for tracking the using of net_device Date: Wed, 2 Oct 2024 12:06:15 +0800 Message-Id: <20241002040616.25193-2-jlee@suse.com> X-Mailer: git-send-email 2.12.3 In-Reply-To: <20241002040616.25193-1-jlee@suse.com> References: <20241002040616.25193-1-jlee@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This is a patch for debugging. For tracking the reference count of using net_device in aoeif, this patch adds a nd_pcpu_refcnt field in aoeif structure. Two wrappers, nd_dev_hold() and nd_dev_put() are used to call dev_hold(nd)/dev_put(nd) and maintain ifp->nd_pcpu_refcnt at the same time. Defined DEBUG to the top of the aoe.h can enable the tracking function. The nd_pcpu_refcnt will be printed to debugfs: rttavg: 249029 rttdev: 1781043 nskbpool: 0 kicked: 0 maxbcnt: 1024 ref: 0 falloc: 36 ffree: 0000000013c0033f 52540054c48e:0:16:16 ssthresh:8 taint:0 r:1270 w:8 enp1s0:1 <-- the aoeif->nd_pcpu_refcnt is behind nd->name The value of aoeif->nd_pcpu_refcnt will also be printed when 'rmmod aoe': [23412.255237][ T2857] aoe: enp1s0->refcnt: 32, aoeif->nd_refcnt: 0 Using kernel dynamic debug can print more detail log but it causes extra overhead: echo -n 'file drivers/block/aoe/* +p' > /sys/kernel/debug/dynamic_debug/con= trol [ 6961.938642] aoe: tx dev_put enp1s0->refcnt: 31, aoeif->nd_refcnt: 1 [ 7023.368814] aoe: aoecmd_cfg_pkts dev_hold lo->refcnt: 30 [ 7023.370530] aoe: aoecmd_cfg_pkts dev_hold enp1s0->refcnt: 32, aoeif->nd_= refcnt: 2 [ 7023.372977] aoe: tx dev_put lo->refcnt: 29 [ 7023.375147] aoe: tx dev_put enp1s0->refcnt: 31, aoeif->nd_refcnt: 1 Normally, after one operation of aoe, the aoeif->nd_refcnt should be shown as '1' which means that calls of dev_hold(nd)/dev_put(nd) are balanced. The final '1' reference of net_device will be removed when rmmod aoe. Signed-off-by: Chun-Yi Lee --- drivers/block/aoe/aoe.h | 84 ++++++++++++++++++++++++++++++++++++++ drivers/block/aoe/aoeblk.c | 5 +++ drivers/block/aoe/aoedev.c | 20 +++++++++ 3 files changed, 109 insertions(+) diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h index 749ae1246f4c..a6d954562794 100644 --- a/drivers/block/aoe/aoe.h +++ b/drivers/block/aoe/aoe.h @@ -1,5 +1,6 @@ /* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */ #include +#include =20 #define VERSION "85" #define AOE_MAJOR 152 @@ -133,6 +134,9 @@ struct aoeif { struct net_device *nd; ulong lost; int bcnt; +#ifdef DEBUG + int __percpu *nd_pcpu_refcnt; +#endif }; =20 struct aoetgt { @@ -238,6 +242,7 @@ void aoedev_downdev(struct aoedev *d); int aoedev_flush(const char __user *str, size_t size); void aoe_failbuf(struct aoedev *, struct buf *); void aoedev_put(struct aoedev *); +struct aoeif *get_aoeif(struct net_device *nd); =20 int aoenet_init(void); void aoenet_exit(void); @@ -246,3 +251,82 @@ int is_aoe_netif(struct net_device *ifp); int set_aoe_iflist(const char __user *str, size_t size); =20 extern struct workqueue_struct *aoe_wq; + +#ifdef DEBUG +static inline int aoeif_nd_refcnt_read(const struct aoeif *ifp) +{ + int i, refcnt =3D 0; + + for_each_possible_cpu(i) + refcnt +=3D *per_cpu_ptr(ifp->nd_pcpu_refcnt, i); + return refcnt; +} + +static inline void aoeif_nd_refcnt_free(struct aoeif *ifp) +{ + int i; + + if(!ifp) + return; + if (ifp->nd) + pr_info("aoe: %s->refcnt: %d, aoeif->nd_refcnt: %d\n", + ifp->nd->name, netdev_refcnt_read(ifp->nd), + aoeif_nd_refcnt_read(ifp)); + else + pr_info("aoe: aoeif->nd_refcnt: %d\n", aoeif_nd_refcnt_read(ifp)); + + for_each_possible_cpu(i) + *per_cpu_ptr(ifp->nd_pcpu_refcnt, i) =3D 0; + free_percpu(ifp->nd_pcpu_refcnt); + ifp->nd_pcpu_refcnt =3D NULL; +} + +/* ifi aoeif input, nb be set to aoeif or in the future will be set */ +static inline void __nd_dev_hold(const char *str, struct net_device *nd, s= truct aoeif *ifi) +{ + struct aoeif *ifp; + + if (!nd) + return; + dev_hold(nd); + ifp =3D ifi? ifi:get_aoeif(nd); + if (ifp) { + this_cpu_inc(*ifp->nd_pcpu_refcnt); + pr_debug("aoe: %s dev_hold %s->refcnt: %d, aoeif->nd_refcnt: %d\n", + str, nd->name, netdev_refcnt_read(nd), + aoeif_nd_refcnt_read(ifp)); + } else + pr_debug("aoe: %s dev_hold %s->refcnt: %d\n", + str, nd->name, netdev_refcnt_read(nd)); +} +#define nd_dev_hold(msg, ifi) __nd_dev_hold(__FUNCTION__, (msg), (ifi)) + +static inline void __nd_dev_put(const char *str, struct net_device *nd, st= ruct aoeif *ifi) +{ + struct aoeif *ifp; + + if (!nd) + return; + dev_put(nd); + ifp =3D ifi? ifi:get_aoeif(nd); + if (ifp) { + this_cpu_dec(*ifp->nd_pcpu_refcnt); + pr_debug("aoe: %s dev_put %s->refcnt: %d, aoeif->nd_refcnt: %d\n", + str, nd->name, netdev_refcnt_read(nd), + aoeif_nd_refcnt_read(ifp)); + } else + pr_debug("aoe: %s dev_put %s->refcnt: %d\n", + str, nd->name, netdev_refcnt_read(nd)); +} +#define nd_dev_put(msg, ifi) __nd_dev_put(__FUNCTION__, (msg), (ifi)) +#else +static inline void nd_dev_put(struct net_device *nd, struct aoeif *ifi) +{ + dev_hold(nd); +} +static inline void nd_dev_hold(struct net_device *nd, struct aoeif *ifi) +{ + dev_put(nd); +} +static inline void aoeif_nd_refcnt_free(const struct aoeif *ifp) {} +#endif // DEBUG diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c index 2028795ec61c..19d62ccca1e9 100644 --- a/drivers/block/aoe/aoeblk.c +++ b/drivers/block/aoe/aoeblk.c @@ -142,7 +142,12 @@ static int aoe_debugfs_show(struct seq_file *s, void *= ignored) ifp =3D (*t)->ifs; ife =3D ifp + ARRAY_SIZE((*t)->ifs); 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Tue, 01 Oct 2024 21:06:35 -0700 (PDT) Received: from linux-l9pv.suse ([124.11.22.254]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e18f8a1429sm511331a91.32.2024.10.01.21.06.32 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 01 Oct 2024 21:06:34 -0700 (PDT) From: Chun-Yi Lee X-Google-Original-From: Chun-Yi Lee To: Justin Sanders Cc: Jens Axboe , Pavel Emelianov , Kirill Korotaev , "David S . Miller" , Nicolai Stange , Greg KH , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Chun-Yi Lee Subject: [RFC PATCH 2/2] aoe: using wrappers instead of dev_hold/dev_put for tracking the references of net_device in aoeif Date: Wed, 2 Oct 2024 12:06:16 +0800 Message-Id: <20241002040616.25193-3-jlee@suse.com> X-Mailer: git-send-email 2.12.3 In-Reply-To: <20241002040616.25193-1-jlee@suse.com> References: <20241002040616.25193-1-jlee@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: Chun-Yi Lee --- drivers/block/aoe/aoecmd.c | 24 ++++++++++++------------ drivers/block/aoe/aoedev.c | 3 ++- drivers/block/aoe/aoenet.c | 2 +- 3 files changed, 15 insertions(+), 14 deletions(-) diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index d1f4ddc57645..2bae364fc5ef 100644 --- a/drivers/block/aoe/aoecmd.c +++ b/drivers/block/aoe/aoecmd.c @@ -361,7 +361,7 @@ ata_rw_frameinit(struct frame *f) } =20 ah->cmdstat =3D ATA_CMD_PIO_READ | writebit | extbit; - dev_hold(t->ifp->nd); + nd_dev_hold(t->ifp->nd, t->ifp); skb->dev =3D t->ifp->nd; } =20 @@ -403,7 +403,7 @@ aoecmd_ata_rw(struct aoedev *d) __skb_queue_tail(&queue, skb); aoenet_xmit(&queue); } else { - dev_put(f->t->ifp->nd); + nd_dev_put(f->t->ifp->nd, f->t->ifp); } return 1; } @@ -421,16 +421,16 @@ aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoemin= or, struct sk_buff_head *qu =20 rcu_read_lock(); for_each_netdev_rcu(&init_net, ifp) { - dev_hold(ifp); + nd_dev_hold(ifp, NULL); if (!is_aoe_netif(ifp)) { - dev_put(ifp); + nd_dev_put(ifp, NULL); continue; } =20 skb =3D new_skb(sizeof *h + sizeof *ch); if (skb =3D=3D NULL) { printk(KERN_INFO "aoe: skb alloc failure\n"); - dev_put(ifp); + nd_dev_put(ifp, NULL); continue; } skb_put(skb, sizeof *h + sizeof *ch); @@ -486,11 +486,11 @@ resend(struct aoedev *d, struct frame *f) memcpy(h->dst, t->addr, sizeof h->dst); memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src); =20 - dev_hold(t->ifp->nd); + nd_dev_hold(t->ifp->nd, t->ifp); skb->dev =3D t->ifp->nd; skb =3D skb_clone(skb, GFP_ATOMIC); if (skb =3D=3D NULL) { - dev_put(t->ifp->nd); + nd_dev_put(t->ifp->nd, t->ifp); return; } f->sent =3D ktime_get(); @@ -552,7 +552,7 @@ ejectif(struct aoetgt *t, struct aoeif *ifp) n =3D (e - ifp) * sizeof *ifp; memmove(ifp, ifp+1, n); e->nd =3D NULL; - dev_put(nd); + nd_dev_put(nd, NULL); } =20 static struct frame * @@ -624,7 +624,7 @@ probe(struct aoetgt *t) __skb_queue_tail(&queue, skb); aoenet_xmit(&queue); } else { - dev_put(f->t->ifp->nd); + nd_dev_put(f->t->ifp->nd, f->t->ifp); } } =20 @@ -1403,7 +1403,7 @@ aoecmd_ata_id(struct aoedev *d) ah->cmdstat =3D ATA_CMD_ID_ATA; ah->lba3 =3D 0xa0; =20 - dev_hold(t->ifp->nd); + nd_dev_hold(t->ifp->nd, t->ifp); skb->dev =3D t->ifp->nd; =20 d->rttavg =3D RTTAVG_INIT; @@ -1414,7 +1414,7 @@ aoecmd_ata_id(struct aoedev *d) if (skb) f->sent =3D ktime_get(); else - dev_put(t->ifp->nd); + nd_dev_put(t->ifp->nd, t->ifp); =20 return skb; } @@ -1514,7 +1514,7 @@ setifbcnt(struct aoetgt *t, struct net_device *nd, in= t bcnt) pr_err("aoe: device setifbcnt failure; too many interfaces.\n"); return; } - dev_hold(nd); + nd_dev_hold(nd, p); p->nd =3D nd; p->bcnt =3D bcnt; } diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c index 9781488b286b..48c936dbb9e5 100644 --- a/drivers/block/aoe/aoedev.c +++ b/drivers/block/aoe/aoedev.c @@ -504,7 +504,8 @@ freetgt(struct aoedev *d, struct aoetgt *t) for (ifp =3D t->ifs; ifp < &t->ifs[NAOEIFS]; ++ifp) { if (!ifp->nd) break; - dev_put(ifp->nd); + nd_dev_put(ifp->nd, ifp); + aoeif_nd_refcnt_free(ifp); } =20 head =3D &t->ffree; diff --git a/drivers/block/aoe/aoenet.c b/drivers/block/aoe/aoenet.c index 923a134fd766..3565042b567f 100644 --- a/drivers/block/aoe/aoenet.c +++ b/drivers/block/aoe/aoenet.c @@ -63,7 +63,7 @@ tx(int id) __must_hold(&txlock) pr_warn("aoe: packet could not be sent on %s. %s\n", ifp ? ifp->name : "netif", "consider increasing tx_queue_len"); - dev_put(ifp); + nd_dev_put(ifp, NULL); spin_lock_irq(&txlock); } return 0; --=20 2.35.3