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[2603:8081:140c:1a00:bfc7:2889:1b58:2997]) by smtp.gmail.com with ESMTPSA id bf3sm2246594oib.34.2021.10.22.12.19.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Oct 2021 12:19:34 -0700 (PDT) From: Bob Pearson To: jgg@nvidia.com, zyjzyj2000@gmail.com, linux-rdma@vger.kernel.org Cc: Bob Pearson Subject: [PATCH for-next v3 07/10] RDMA/rxe: Rewrite rxe_mcast.c Date: Fri, 22 Oct 2021 14:18:22 -0500 Message-Id: <20211022191824.18307-8-rpearsonhpe@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211022191824.18307-1-rpearsonhpe@gmail.com> References: <20211022191824.18307-1-rpearsonhpe@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Rewrite rxe_mcast to support rxe_fini_ref and clean up referencing. Drop mc_elem as rxe pool objects and just use kmalloc/kfree. Take qp references as well as mc_grp references to force all mc groups to be de-attached before destroying QPs. Simplify the api to rxe_verbs. Signed-off-by: Bob Pearson --- drivers/infiniband/sw/rxe/rxe.c | 8 - drivers/infiniband/sw/rxe/rxe_loc.h | 11 +- drivers/infiniband/sw/rxe/rxe_mcast.c | 205 +++++++++++++++++--------- drivers/infiniband/sw/rxe/rxe_net.c | 22 --- drivers/infiniband/sw/rxe/rxe_pool.c | 6 - drivers/infiniband/sw/rxe/rxe_pool.h | 1 - drivers/infiniband/sw/rxe/rxe_verbs.c | 12 +- drivers/infiniband/sw/rxe/rxe_verbs.h | 3 +- 8 files changed, 143 insertions(+), 125 deletions(-) diff --git a/drivers/infiniband/sw/rxe/rxe.c b/drivers/infiniband/sw/rxe/rxe.c index 8e0f9c489cab..4298a1d20ad5 100644 --- a/drivers/infiniband/sw/rxe/rxe.c +++ b/drivers/infiniband/sw/rxe/rxe.c @@ -31,7 +31,6 @@ void rxe_dealloc(struct ib_device *ib_dev) rxe_pool_cleanup(&rxe->mr_pool); rxe_pool_cleanup(&rxe->mw_pool); rxe_pool_cleanup(&rxe->mc_grp_pool); - rxe_pool_cleanup(&rxe->mc_elem_pool); if (rxe->tfm) crypto_free_shash(rxe->tfm); @@ -165,15 +164,8 @@ static int rxe_init_pools(struct rxe_dev *rxe) if (err) goto err9; - err = rxe_pool_init(rxe, &rxe->mc_elem_pool, RXE_TYPE_MC_ELEM, - rxe->attr.max_total_mcast_qp_attach); - if (err) - goto err10; - return 0; -err10: - rxe_pool_cleanup(&rxe->mc_grp_pool); err9: rxe_pool_cleanup(&rxe->mw_pool); err8: diff --git a/drivers/infiniband/sw/rxe/rxe_loc.h b/drivers/infiniband/sw/rxe/rxe_loc.h index a25d1c9f6adb..78312df8eea3 100644 --- a/drivers/infiniband/sw/rxe/rxe_loc.h +++ b/drivers/infiniband/sw/rxe/rxe_loc.h @@ -38,19 +38,12 @@ int rxe_cq_post(struct rxe_cq *cq, struct rxe_cqe *cqe, int solicited); void rxe_cq_cleanup(struct rxe_pool_entry *arg); /* rxe_mcast.c */ -int rxe_mcast_get_grp(struct rxe_dev *rxe, union ib_gid *mgid, - struct rxe_mc_grp **grp_p); - int rxe_mcast_add_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp, - struct rxe_mc_grp *grp); - + union ib_gid *mgid); int rxe_mcast_drop_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp, union ib_gid *mgid); - void rxe_drop_all_mcast_groups(struct rxe_qp *qp); -void rxe_mc_cleanup(struct rxe_pool_entry *arg); - /* rxe_mmap.c */ struct rxe_mmap_info { struct list_head pending_mmaps; @@ -104,8 +97,6 @@ int rxe_prepare(struct rxe_pkt_info *pkt, struct sk_buff *skb); int rxe_xmit_packet(struct rxe_qp *qp, struct rxe_pkt_info *pkt, struct sk_buff *skb); const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num); -int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid); -int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid); /* rxe_qp.c */ int rxe_qp_chk_init(struct rxe_dev *rxe, struct ib_qp_init_attr *init); diff --git a/drivers/infiniband/sw/rxe/rxe_mcast.c b/drivers/infiniband/sw/rxe/rxe_mcast.c index 337dc2c68051..685440a20669 100644 --- a/drivers/infiniband/sw/rxe/rxe_mcast.c +++ b/drivers/infiniband/sw/rxe/rxe_mcast.c @@ -5,116 +5,192 @@ */ #include "rxe.h" -#include "rxe_loc.h" -/* caller should hold mc_grp_pool->pool_lock */ -static struct rxe_mc_grp *create_grp(struct rxe_dev *rxe, - struct rxe_pool *pool, - union ib_gid *mgid) +static int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid) { int err; + unsigned char ll_addr[ETH_ALEN]; + + ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr); + err = dev_mc_add(rxe->ndev, ll_addr); + + return err; +} + +static int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid) +{ + int err; + unsigned char ll_addr[ETH_ALEN]; + + ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr); + err = dev_mc_del(rxe->ndev, ll_addr); + + return err; +} + +static int rxe_mcast_get_grp(struct rxe_dev *rxe, union ib_gid *mgid, + struct rxe_mc_grp **grp_p) +{ + struct rxe_pool *pool = &rxe->mc_grp_pool; struct rxe_mc_grp *grp; + unsigned long flags; + int err = 0; + + /* Perform this while holding the mc_grp_pool lock + * to prevent races where two coincident calls fail to lookup the + * same group and then both create the same group. + */ + write_lock_irqsave(&pool->pool_lock, flags); + grp = rxe_pool_get_key_locked(pool, mgid); + if (grp) + goto done; grp = rxe_alloc_with_key_locked(&rxe->mc_grp_pool, mgid); - if (!grp) - return ERR_PTR(-ENOMEM); + if (!grp) { + err = -ENOMEM; + goto done; + } INIT_LIST_HEAD(&grp->qp_list); spin_lock_init(&grp->mcg_lock); grp->rxe = rxe; err = rxe_mcast_add(rxe, mgid); - if (unlikely(err)) { - rxe_drop_ref(grp); - return ERR_PTR(err); + if (err) { + rxe_fini_ref_locked(grp); + grp = NULL; + goto done; } - return grp; + /* match the reference taken by get_key */ + rxe_add_ref_locked(grp); +done: + *grp_p = grp; + write_unlock_irqrestore(&pool->pool_lock, flags); + + return err; } -int rxe_mcast_get_grp(struct rxe_dev *rxe, union ib_gid *mgid, - struct rxe_mc_grp **grp_p) +static void rxe_mcast_put_grp(struct rxe_mc_grp *grp) { - int err; - struct rxe_mc_grp *grp; + struct rxe_dev *rxe = grp->rxe; struct rxe_pool *pool = &rxe->mc_grp_pool; unsigned long flags; - if (rxe->attr.max_mcast_qp_attach == 0) - return -EINVAL; - write_lock_irqsave(&pool->pool_lock, flags); - grp = rxe_pool_get_key_locked(pool, mgid); - if (grp) - goto done; + rxe_drop_ref_locked(grp); - grp = create_grp(rxe, pool, mgid); - if (IS_ERR(grp)) { - write_unlock_irqrestore(&pool->pool_lock, flags); - err = PTR_ERR(grp); - return err; + if (rxe_read_ref(grp) == 1) { + rxe_mcast_delete(rxe, &grp->mgid); + rxe_fini_ref_locked(grp); } -done: write_unlock_irqrestore(&pool->pool_lock, flags); - *grp_p = grp; - return 0; } +/** + * rxe_mcast_add_grp_elem() - Associate a multicast address with a QP + * @rxe: the rxe device + * @qp: the QP + * @mgid: the multicast address + * + * Each multicast group can be associated with one or more QPs and + * each QP can be associated with zero or more multicast groups. + * Between each multicast group associated with a QP there is a + * rxe_mc_elem struct which has two list head structs and is joined + * both to a list of QPs on the multicast group and a list of groups + * on the QP. The elem has pointers to the group and the QP and + * takes a reference for each one. + * + * Return: 0 on success or an error on failure. + */ int rxe_mcast_add_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp, - struct rxe_mc_grp *grp) + union ib_gid *mgid) { - int err; struct rxe_mc_elem *elem; + struct rxe_mc_grp *grp; + int err; + + if (rxe->attr.max_mcast_qp_attach == 0) + return -EINVAL; + + /* takes a ref on grp if successful */ + err = rxe_mcast_get_grp(rxe, mgid, &grp); + if (err) + return err; - /* check to see of the qp is already a member of the group */ spin_lock_bh(&qp->grp_lock); spin_lock_bh(&grp->mcg_lock); + + /* check to see if the qp is already a member of the group */ list_for_each_entry(elem, &grp->qp_list, qp_list) { - if (elem->qp == qp) { - err = 0; - goto out; - } + if (elem->qp == qp) + goto drop_ref; } if (grp->num_qp >= rxe->attr.max_mcast_qp_attach) { err = -ENOMEM; - goto out; + goto drop_ref; } - elem = rxe_alloc_locked(&rxe->mc_elem_pool); - if (!elem) { + if (atomic_read(&rxe->total_mcast_qp_attach) >= + rxe->attr.max_total_mcast_qp_attach) { err = -ENOMEM; - goto out; + goto drop_ref; } - /* each qp holds a ref on the grp */ - rxe_add_ref(grp); + elem = kmalloc(sizeof(*elem), GFP_KERNEL); + if (!elem) { + err = -ENOMEM; + goto drop_ref; + } + atomic_inc(&rxe->total_mcast_qp_attach); grp->num_qp++; + rxe_add_ref(qp); elem->qp = qp; + /* still holding a ref on grp */ elem->grp = grp; list_add(&elem->qp_list, &grp->qp_list); list_add(&elem->grp_list, &qp->grp_list); - err = 0; -out: + goto done; + +drop_ref: + rxe_drop_ref(grp); + +done: spin_unlock_bh(&grp->mcg_lock); spin_unlock_bh(&qp->grp_lock); + return err; } +/** + * rxe_mcast_drop_grp_elem() - Dissociate multicast address and QP + * @rxe: the rxe device + * @qp: the QP + * @mgid: the multicast group + * + * Walk the list of group elements to find one which matches QP + * Then delete from group and qp lists and free pointers and the elem. + * Check to see if we have removed the last qp from group and delete + * it if so. + * + * Return: 0 on success else an error on failure + */ int rxe_mcast_drop_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp, union ib_gid *mgid) { - struct rxe_mc_grp *grp; struct rxe_mc_elem *elem, *tmp; + struct rxe_mc_grp *grp; + int err = 0; grp = rxe_pool_get_key(&rxe->mc_grp_pool, mgid); if (!grp) - goto err1; + return -EINVAL; spin_lock_bh(&qp->grp_lock); spin_lock_bh(&grp->mcg_lock); @@ -123,26 +199,28 @@ int rxe_mcast_drop_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp, if (elem->qp == qp) { list_del(&elem->qp_list); list_del(&elem->grp_list); + rxe_drop_ref(grp); + rxe_drop_ref(qp); grp->num_qp--; - - spin_unlock_bh(&grp->mcg_lock); - spin_unlock_bh(&qp->grp_lock); - rxe_drop_ref(elem); - rxe_drop_ref(grp); /* ref held by QP */ - rxe_drop_ref(grp); /* ref from get_key */ - return 0; + kfree(elem); + atomic_dec(&rxe->total_mcast_qp_attach); + goto done; } } + err = -EINVAL; +done: spin_unlock_bh(&grp->mcg_lock); spin_unlock_bh(&qp->grp_lock); - rxe_drop_ref(grp); /* ref from get_key */ -err1: - return -EINVAL; + + rxe_mcast_put_grp(grp); + + return err; } void rxe_drop_all_mcast_groups(struct rxe_qp *qp) { + struct rxe_dev *rxe = to_rdev(qp->ibqp.device); struct rxe_mc_grp *grp; struct rxe_mc_elem *elem; @@ -162,15 +240,10 @@ void rxe_drop_all_mcast_groups(struct rxe_qp *qp) list_del(&elem->qp_list); grp->num_qp--; spin_unlock_bh(&grp->mcg_lock); - rxe_drop_ref(grp); - rxe_drop_ref(elem); - } -} -void rxe_mc_cleanup(struct rxe_pool_entry *arg) -{ - struct rxe_mc_grp *grp = container_of(arg, typeof(*grp), pelem); - struct rxe_dev *rxe = grp->rxe; - - rxe_mcast_delete(rxe, &grp->mgid); + kfree(elem); + atomic_dec(&rxe->total_mcast_qp_attach); + rxe_drop_ref(qp); + rxe_mcast_put_grp(grp); + } } diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c index 2cb810cb890a..fcdf998ec896 100644 --- a/drivers/infiniband/sw/rxe/rxe_net.c +++ b/drivers/infiniband/sw/rxe/rxe_net.c @@ -20,28 +20,6 @@ static struct rxe_recv_sockets recv_sockets; -int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid) -{ - int err; - unsigned char ll_addr[ETH_ALEN]; - - ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr); - err = dev_mc_add(rxe->ndev, ll_addr); - - return err; -} - -int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid) -{ - int err; - unsigned char ll_addr[ETH_ALEN]; - - ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr); - err = dev_mc_del(rxe->ndev, ll_addr); - - return err; -} - static struct dst_entry *rxe_find_route4(struct net_device *ndev, struct in_addr *saddr, struct in_addr *daddr) diff --git a/drivers/infiniband/sw/rxe/rxe_pool.c b/drivers/infiniband/sw/rxe/rxe_pool.c index 4be43ae58219..2cd4d8803a0e 100644 --- a/drivers/infiniband/sw/rxe/rxe_pool.c +++ b/drivers/infiniband/sw/rxe/rxe_pool.c @@ -76,16 +76,10 @@ static const struct rxe_type_info rxe_type_info[RXE_NUM_TYPES] = { .name = "rxe-mc_grp", .size = sizeof(struct rxe_mc_grp), .elem_offset = offsetof(struct rxe_mc_grp, pelem), - .cleanup = rxe_mc_cleanup, .flags = RXE_POOL_KEY, .key_offset = offsetof(struct rxe_mc_grp, mgid), .key_size = sizeof(union ib_gid), }, - [RXE_TYPE_MC_ELEM] = { - .name = "rxe-mc_elem", - .size = sizeof(struct rxe_mc_elem), - .elem_offset = offsetof(struct rxe_mc_elem, pelem), - }, }; static int rxe_pool_init_index(struct rxe_pool *pool, u32 max, u32 min) diff --git a/drivers/infiniband/sw/rxe/rxe_pool.h b/drivers/infiniband/sw/rxe/rxe_pool.h index 7df52d34e306..071e5c557d31 100644 --- a/drivers/infiniband/sw/rxe/rxe_pool.h +++ b/drivers/infiniband/sw/rxe/rxe_pool.h @@ -26,7 +26,6 @@ enum rxe_elem_type { RXE_TYPE_MR, RXE_TYPE_MW, RXE_TYPE_MC_GRP, - RXE_TYPE_MC_ELEM, RXE_NUM_TYPES, /* keep me last */ }; diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c index 61fa633775f3..a475fc04e05b 100644 --- a/drivers/infiniband/sw/rxe/rxe_verbs.c +++ b/drivers/infiniband/sw/rxe/rxe_verbs.c @@ -986,20 +986,10 @@ static int rxe_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, static int rxe_attach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid) { - int err; struct rxe_dev *rxe = to_rdev(ibqp->device); struct rxe_qp *qp = to_rqp(ibqp); - struct rxe_mc_grp *grp; - - /* takes a ref on grp if successful */ - err = rxe_mcast_get_grp(rxe, mgid, &grp); - if (err) - return err; - - err = rxe_mcast_add_grp_elem(rxe, qp, grp); - rxe_drop_ref(grp); - return err; + return rxe_mcast_add_grp_elem(rxe, qp, mgid); } static int rxe_detach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid) diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.h b/drivers/infiniband/sw/rxe/rxe_verbs.h index 35e041450090..4f1d7777f755 100644 --- a/drivers/infiniband/sw/rxe/rxe_verbs.h +++ b/drivers/infiniband/sw/rxe/rxe_verbs.h @@ -403,7 +403,8 @@ struct rxe_dev { struct rxe_pool mr_pool; struct rxe_pool mw_pool; struct rxe_pool mc_grp_pool; - struct rxe_pool mc_elem_pool; + + atomic_t total_mcast_qp_attach; spinlock_t pending_lock; /* guard pending_mmaps */ struct list_head pending_mmaps; -- 2.30.2