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Thu, 5 Aug 2021 15:15:58 +0900 (KST) Received: from epsmtrp2.samsung.com (unknown [182.195.40.14]) by epcas1p3.samsung.com (KnoxPortal) with ESMTPA id 20210805061557epcas1p3f81728c626775f0aa66faa7796005bd3~YVHwxUp213078130781epcas1p3u; Thu, 5 Aug 2021 06:15:57 +0000 (GMT) Received: from epsmgms1p1new.samsung.com (unknown [182.195.42.41]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20210805061557epsmtrp29be5ff17704575a51e10a4d2155ce7de~YVHwwTIQl0723807238epsmtrp2i; Thu, 5 Aug 2021 06:15:57 +0000 (GMT) X-AuditID: b6c32a38-97bff70000002787-16-610b821e1fd2 Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgms1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id D5.43.08394.D128B016; Thu, 5 Aug 2021 15:15:57 +0900 (KST) Received: from localhost.localdomain (unknown [10.89.31.111]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20210805061557epsmtip1014313e26ff26de5392f9713e9a3e628~YVHwaxPxi0030400304epsmtip1J; Thu, 5 Aug 2021 06:15:57 +0000 (GMT) From: Namjae Jeon To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-cifs@vger.kernel.org Cc: linux-cifsd-devel@lists.sourceforge.net, aurelien.aptel@gmail.com, sandeen@sandeen.net, willy@infradead.org, hch@infradead.org, senozhatsky@chromium.org, christian@brauner.io, viro@zeniv.linux.org.uk, ronniesahlberg@gmail.com, hch@lst.de, dan.carpenter@oracle.com, metze@samba.org, smfrench@gmail.com, hyc.lee@gmail.com, Namjae Jeon , Steve French Subject: [PATCH v7 05/13] ksmbd: add rdma transport layer Date: Thu, 5 Aug 2021 15:05:38 +0900 Message-Id: <20210805060546.3268-6-namjae.jeon@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210805060546.3268-1-namjae.jeon@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrPJsWRmVeSWpSXmKPExsWy7bCmnq5cE3eiQcNFdovjr/+yWzS+U7Z4 /W86i8XpCYuYLFauPspkce3+e3aLF/93MVv8/P+d0WLP3pMsFpd3zWGzuLjsJ4vFj+n1Fr19 n1gtWq9oWezeuIjN4s2Lw2wWtybOZ7M4//c4q8XvH3PYHIQ9/s79yOwxu+Eii8fOWXfZPTav 0PLYveAzk8fumw1sHq07/rJ7fHx6i8Vj7q4+Ro++LasYPbYsfsjk8XmTnMemJ2+ZAnijcmwy UhNTUosUUvOS81My89JtlbyD453jTc0MDHUNLS3MlRTyEnNTbZVcfAJ03TJzgN5UUihLzCkF CgUkFhcr6dvZFOWXlqQqZOQXl9gqpRak5BQYGhToFSfmFpfmpesl5+daGRoYGJkCVSbkZPSe /81S0PqCuWLb4U62BsYrvcxdjJwcEgImEieX32bsYuTiEBLYwShxbcpjKOcTo8SildfZIJxv jBJ3n+1lh2nZfWATK0RiL6PEhHvbmOBaNq1eBNTCwcEmoC3xZ4soSIOIQKzEjR2vmUFqmAVm M0s833uKBSQhLGApsXnOHLCpLAKqEp0dH1hBbF4Ba4mFyz4xQmyTl1i94QDYsZwCNhKvVm8G 2ywhcIdD4smNdawQRS4Sm0+/g2oQlnh1fAvUqVISn9/tZYOwyyVOnPzFBGHXSGyYt48d5FAJ AWOJnhclICazgKbE+l36EBWKEjt/zwWbyCzAJ/Huaw8rRDWvREebEESJqkTfpcNQA6Uluto/ QC31kNj0vAcaiv2MEoc7FrNOYJSbhbBhASPjKkax1ILi3PTUYsMCE+Q428QITslaFjsY5779 oHeIkYmD8RCjBAezkghv8mKuRCHelMTKqtSi/Pii0pzU4kOMpsCwm8gsJZqcD8wKeSXxhqZG xsbGFiZm5mamxkrivN9ivyYICaQnlqRmp6YWpBbB9DFxcEo1MEUyHMpcOOdEcpJramJbK89M 0QCZqAAtP8vygv3z/pwyqnY55HH/Yt3SjNuFEuzrzS1T3Dcn/FwYpCAdWTztlk1P4NagXXdO zF515se1cNWt1yK7d3nuZ1H/J9RfbLV4Y0TUo4q4HfzMmm/kQnOseyq/Or9TM3yp9eHrzu+L bbzZnfsvX7O/9zWtLPtf1Av54iMbLh6429DQ+2DL1t63ze5Mn3RiPoXd/6PY1B70OHSrfe+v f6sXbTwv7HzTZeax5Sc/vk1c5bU3W19lep5Jv+q+k4EajYfObOF9mfxsZnm6UMK5FYEr6z+X z7Y86rK1Ye8vnfNfZrUKvd17rftx2dPC27s3zgxxYX20xkTgx2IlluKMREMt5qLiRAAZKFT1 UgQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrBLMWRmVeSWpSXmKPExsWy7bCSnK5sE3eiwfdpchbHX/9lt2h8p2zx +t90FovTExYxWaxcfZTJ4tr99+wWL/7vYrb4+f87o8WevSdZLC7vmsNmcXHZTxaLH9PrLXr7 PrFatF7Rsti9cRGbxZsXh9ksbk2cz2Zx/u9xVovfP+awOQh7/J37kdljdsNFFo+ds+6ye2xe oeWxe8FnJo/dNxvYPFp3/GX3+Pj0FovH3F19jB59W1YxemxZ/JDJ4/MmOY9NT94yBfBGcdmk pOZklqUW6dslcGX0nv/NUtD6grli2+FOtgbGK73MXYycHBICJhK7D2xi7WLk4hAS2M0o8Xr3 RUaIhLTEsRNngIo4gGxhicOHiyFqPjBKnOz9wQISZxPQlvizRRSkXEQgXuJmw20WkBpmgfXM EmdfN7GAJIQFLCU2z5nDDmKzCKhKdHZ8YAWxeQWsJRYu+wS1S15i9YYDYAdxCthIvFq9GaxG CKjm/dtrzBMY+RYwMqxilEwtKM5Nzy02LDDMSy3XK07MLS7NS9dLzs/dxAiOHC3NHYzbV33Q O8TIxMF4iFGCg1lJhDd5MVeiEG9KYmVValF+fFFpTmrxIUZpDhYlcd4LXSfjhQTSE0tSs1NT C1KLYLJMHJxSDUyKAg9atyzMiv+cLzDp76Uw13+Baxudqg4G3Zh8w7N/RZ2Jg+UOsZJDdSeZ plybVzDtdnea3q81b7L2XluZuP5RQMp64VKpmJmJMqwNrj/Ulk/d1b/LSjaoiG2B1GSuD87R 3ZcYc6dyuj9NaTs5+/bfZ5enq+3yL/EPSS60OlE3z3/d2bM+lVKNjzRmvGu5LOl0qHrh30MZ Jrdq+i43fPD0ZThU18RntuwWX8T2wENXDj9xEbu2oLNDq/vjy9uefdKXk7uFWibzfbfymqY5 7XYIw0bndZXF/mItr5YpZ7BdPW0bNe3qzYTn6dWrg1evW6WUFKBQzl/wbzMLx4XZ6cff/pi+ jvX8veZov60x3ReVWIozEg21mIuKEwGD93u2CwMAAA== X-CMS-MailID: 20210805061557epcas1p3f81728c626775f0aa66faa7796005bd3 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20210805061557epcas1p3f81728c626775f0aa66faa7796005bd3 References: <20210805060546.3268-1-namjae.jeon@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds rdma transport layer. Signed-off-by: Namjae Jeon Signed-off-by: Sergey Senozhatsky Signed-off-by: Hyunchul Lee Acked-by: Ronnie Sahlberg Signed-off-by: Steve French --- fs/ksmbd/transport_rdma.c | 2057 +++++++++++++++++++++++++++++++++++++ fs/ksmbd/transport_rdma.h | 63 ++ 2 files changed, 2120 insertions(+) create mode 100644 fs/ksmbd/transport_rdma.c create mode 100644 fs/ksmbd/transport_rdma.h diff --git a/fs/ksmbd/transport_rdma.c b/fs/ksmbd/transport_rdma.c new file mode 100644 index 000000000000..f2ae6bae83f1 --- /dev/null +++ b/fs/ksmbd/transport_rdma.c @@ -0,0 +1,2057 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2017, Microsoft Corporation. + * Copyright (C) 2018, LG Electronics. + * + * Author(s): Long Li , + * Hyunchul Lee + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + */ + +#define SUBMOD_NAME "smb_direct" + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "glob.h" +#include "connection.h" +#include "smb_common.h" +#include "smbstatus.h" +#include "transport_rdma.h" + +#define SMB_DIRECT_PORT 5445 + +#define SMB_DIRECT_VERSION_LE cpu_to_le16(0x0100) + +/* SMB_DIRECT negotiation timeout in seconds */ +#define SMB_DIRECT_NEGOTIATE_TIMEOUT 120 + +#define SMB_DIRECT_MAX_SEND_SGES 8 +#define SMB_DIRECT_MAX_RECV_SGES 1 + +/* + * Default maximum number of RDMA read/write outstanding on this connection + * This value is possibly decreased during QP creation on hardware limit + */ +#define SMB_DIRECT_CM_INITIATOR_DEPTH 8 + +/* Maximum number of retries on data transfer operations */ +#define SMB_DIRECT_CM_RETRY 6 +/* No need to retry on Receiver Not Ready since SMB_DIRECT manages credits */ +#define SMB_DIRECT_CM_RNR_RETRY 0 + +/* + * User configurable initial values per SMB_DIRECT transport connection + * as defined in [MS-SMBD] 3.1.1.1 + * Those may change after a SMB_DIRECT negotiation + */ +/* The local peer's maximum number of credits to grant to the peer */ +static int smb_direct_receive_credit_max = 255; + +/* The remote peer's credit request of local peer */ +static int smb_direct_send_credit_target = 255; + +/* The maximum single message size can be sent to remote peer */ +static int smb_direct_max_send_size = 8192; + +/* The maximum fragmented upper-layer payload receive size supported */ +static int smb_direct_max_fragmented_recv_size = 1024 * 1024; + +/* The maximum single-message size which can be received */ +static int smb_direct_max_receive_size = 8192; + +static int smb_direct_max_read_write_size = 1024 * 1024; + +static int smb_direct_max_outstanding_rw_ops = 8; + +static struct smb_direct_listener { + struct rdma_cm_id *cm_id; +} smb_direct_listener; + +static struct workqueue_struct *smb_direct_wq; + +enum smb_direct_status { + SMB_DIRECT_CS_NEW = 0, + SMB_DIRECT_CS_CONNECTED, + SMB_DIRECT_CS_DISCONNECTING, + SMB_DIRECT_CS_DISCONNECTED, +}; + +struct smb_direct_transport { + struct ksmbd_transport transport; + + enum smb_direct_status status; + bool full_packet_received; + wait_queue_head_t wait_status; + + struct rdma_cm_id *cm_id; + struct ib_cq *send_cq; + struct ib_cq *recv_cq; + struct ib_pd *pd; + struct ib_qp *qp; + + int max_send_size; + int max_recv_size; + int max_fragmented_send_size; + int max_fragmented_recv_size; + int max_rdma_rw_size; + + spinlock_t reassembly_queue_lock; + struct list_head reassembly_queue; + int reassembly_data_length; + int reassembly_queue_length; + int first_entry_offset; + wait_queue_head_t wait_reassembly_queue; + + spinlock_t receive_credit_lock; + int recv_credits; + int count_avail_recvmsg; + int recv_credit_max; + int recv_credit_target; + + spinlock_t recvmsg_queue_lock; + struct list_head recvmsg_queue; + + spinlock_t empty_recvmsg_queue_lock; + struct list_head empty_recvmsg_queue; + + int send_credit_target; + atomic_t send_credits; + spinlock_t lock_new_recv_credits; + int new_recv_credits; + atomic_t rw_avail_ops; + + wait_queue_head_t wait_send_credits; + wait_queue_head_t wait_rw_avail_ops; + + mempool_t *sendmsg_mempool; + struct kmem_cache *sendmsg_cache; + mempool_t *recvmsg_mempool; + struct kmem_cache *recvmsg_cache; + + wait_queue_head_t wait_send_payload_pending; + atomic_t send_payload_pending; + wait_queue_head_t wait_send_pending; + atomic_t send_pending; + + struct delayed_work post_recv_credits_work; + struct work_struct send_immediate_work; + struct work_struct disconnect_work; + + bool negotiation_requested; +}; + +#define KSMBD_TRANS(t) ((struct ksmbd_transport *)&((t)->transport)) + +enum { + SMB_DIRECT_MSG_NEGOTIATE_REQ = 0, + SMB_DIRECT_MSG_DATA_TRANSFER +}; + +static struct ksmbd_transport_ops ksmbd_smb_direct_transport_ops; + +struct smb_direct_send_ctx { + struct list_head msg_list; + int wr_cnt; + bool need_invalidate_rkey; + unsigned int remote_key; +}; + +struct smb_direct_sendmsg { + struct smb_direct_transport *transport; + struct ib_send_wr wr; + struct list_head list; + int num_sge; + struct ib_sge sge[SMB_DIRECT_MAX_SEND_SGES]; + struct ib_cqe cqe; + u8 packet[]; +}; + +struct smb_direct_recvmsg { + struct smb_direct_transport *transport; + struct list_head list; + int type; + struct ib_sge sge; + struct ib_cqe cqe; + bool first_segment; + u8 packet[]; +}; + +struct smb_direct_rdma_rw_msg { + struct smb_direct_transport *t; + struct ib_cqe cqe; + struct completion *completion; + struct rdma_rw_ctx rw_ctx; + struct sg_table sgt; + struct scatterlist sg_list[0]; +}; + +static inline int get_buf_page_count(void *buf, int size) +{ + return DIV_ROUND_UP((uintptr_t)buf + size, PAGE_SIZE) - + (uintptr_t)buf / PAGE_SIZE; +} + +static void smb_direct_destroy_pools(struct smb_direct_transport *transport); +static void smb_direct_post_recv_credits(struct work_struct *work); +static int smb_direct_post_send_data(struct smb_direct_transport *t, + struct smb_direct_send_ctx *send_ctx, + struct kvec *iov, int niov, + int remaining_data_length); + +static inline struct smb_direct_transport * +smb_trans_direct_transfort(struct ksmbd_transport *t) +{ + return container_of(t, struct smb_direct_transport, transport); +} + +static inline void +*smb_direct_recvmsg_payload(struct smb_direct_recvmsg *recvmsg) +{ + return (void *)recvmsg->packet; +} + +static inline bool is_receive_credit_post_required(int receive_credits, + int avail_recvmsg_count) +{ + return receive_credits <= (smb_direct_receive_credit_max >> 3) && + avail_recvmsg_count >= (receive_credits >> 2); +} + +static struct +smb_direct_recvmsg *get_free_recvmsg(struct smb_direct_transport *t) +{ + struct smb_direct_recvmsg *recvmsg = NULL; + + spin_lock(&t->recvmsg_queue_lock); + if (!list_empty(&t->recvmsg_queue)) { + recvmsg = list_first_entry(&t->recvmsg_queue, + struct smb_direct_recvmsg, + list); + list_del(&recvmsg->list); + } + spin_unlock(&t->recvmsg_queue_lock); + return recvmsg; +} + +static void put_recvmsg(struct smb_direct_transport *t, + struct smb_direct_recvmsg *recvmsg) +{ + ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr, + recvmsg->sge.length, DMA_FROM_DEVICE); + + spin_lock(&t->recvmsg_queue_lock); + list_add(&recvmsg->list, &t->recvmsg_queue); + spin_unlock(&t->recvmsg_queue_lock); +} + +static struct +smb_direct_recvmsg *get_empty_recvmsg(struct smb_direct_transport *t) +{ + struct smb_direct_recvmsg *recvmsg = NULL; + + spin_lock(&t->empty_recvmsg_queue_lock); + if (!list_empty(&t->empty_recvmsg_queue)) { + recvmsg = list_first_entry(&t->empty_recvmsg_queue, + struct smb_direct_recvmsg, list); + list_del(&recvmsg->list); + } + spin_unlock(&t->empty_recvmsg_queue_lock); + return recvmsg; +} + +static void put_empty_recvmsg(struct smb_direct_transport *t, + struct smb_direct_recvmsg *recvmsg) +{ + ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr, + recvmsg->sge.length, DMA_FROM_DEVICE); + + spin_lock(&t->empty_recvmsg_queue_lock); + list_add_tail(&recvmsg->list, &t->empty_recvmsg_queue); + spin_unlock(&t->empty_recvmsg_queue_lock); +} + +static void enqueue_reassembly(struct smb_direct_transport *t, + struct smb_direct_recvmsg *recvmsg, + int data_length) +{ + spin_lock(&t->reassembly_queue_lock); + list_add_tail(&recvmsg->list, &t->reassembly_queue); + t->reassembly_queue_length++; + /* + * Make sure reassembly_data_length is updated after list and + * reassembly_queue_length are updated. On the dequeue side + * reassembly_data_length is checked without a lock to determine + * if reassembly_queue_length and list is up to date + */ + virt_wmb(); + t->reassembly_data_length += data_length; + spin_unlock(&t->reassembly_queue_lock); +} + +static struct smb_direct_recvmsg *get_first_reassembly(struct smb_direct_transport *t) +{ + if (!list_empty(&t->reassembly_queue)) + return list_first_entry(&t->reassembly_queue, + struct smb_direct_recvmsg, list); + else + return NULL; +} + +static void smb_direct_disconnect_rdma_work(struct work_struct *work) +{ + struct smb_direct_transport *t = + container_of(work, struct smb_direct_transport, + disconnect_work); + + if (t->status == SMB_DIRECT_CS_CONNECTED) { + t->status = SMB_DIRECT_CS_DISCONNECTING; + rdma_disconnect(t->cm_id); + } +} + +static void +smb_direct_disconnect_rdma_connection(struct smb_direct_transport *t) +{ + queue_work(smb_direct_wq, &t->disconnect_work); +} + +static void smb_direct_send_immediate_work(struct work_struct *work) +{ + struct smb_direct_transport *t = container_of(work, + struct smb_direct_transport, send_immediate_work); + + if (t->status != SMB_DIRECT_CS_CONNECTED) + return; + + smb_direct_post_send_data(t, NULL, NULL, 0, 0); +} + +static struct smb_direct_transport *alloc_transport(struct rdma_cm_id *cm_id) +{ + struct smb_direct_transport *t; + struct ksmbd_conn *conn; + + t = kzalloc(sizeof(*t), GFP_KERNEL); + if (!t) + return NULL; + + t->cm_id = cm_id; + cm_id->context = t; + + t->status = SMB_DIRECT_CS_NEW; + init_waitqueue_head(&t->wait_status); + + spin_lock_init(&t->reassembly_queue_lock); + INIT_LIST_HEAD(&t->reassembly_queue); + t->reassembly_data_length = 0; + t->reassembly_queue_length = 0; + init_waitqueue_head(&t->wait_reassembly_queue); + init_waitqueue_head(&t->wait_send_credits); + init_waitqueue_head(&t->wait_rw_avail_ops); + + spin_lock_init(&t->receive_credit_lock); + spin_lock_init(&t->recvmsg_queue_lock); + INIT_LIST_HEAD(&t->recvmsg_queue); + + spin_lock_init(&t->empty_recvmsg_queue_lock); + INIT_LIST_HEAD(&t->empty_recvmsg_queue); + + init_waitqueue_head(&t->wait_send_payload_pending); + atomic_set(&t->send_payload_pending, 0); + init_waitqueue_head(&t->wait_send_pending); + atomic_set(&t->send_pending, 0); + + spin_lock_init(&t->lock_new_recv_credits); + + INIT_DELAYED_WORK(&t->post_recv_credits_work, + smb_direct_post_recv_credits); + INIT_WORK(&t->send_immediate_work, smb_direct_send_immediate_work); + INIT_WORK(&t->disconnect_work, smb_direct_disconnect_rdma_work); + + conn = ksmbd_conn_alloc(); + if (!conn) + goto err; + conn->transport = KSMBD_TRANS(t); + KSMBD_TRANS(t)->conn = conn; + KSMBD_TRANS(t)->ops = &ksmbd_smb_direct_transport_ops; + return t; +err: + kfree(t); + return NULL; +} + +static void free_transport(struct smb_direct_transport *t) +{ + struct smb_direct_recvmsg *recvmsg; + + wake_up_interruptible(&t->wait_send_credits); + + ksmbd_debug(RDMA, "wait for all send posted to IB to finish\n"); + wait_event(t->wait_send_payload_pending, + atomic_read(&t->send_payload_pending) == 0); + wait_event(t->wait_send_pending, + atomic_read(&t->send_pending) == 0); + + cancel_work_sync(&t->disconnect_work); + cancel_delayed_work_sync(&t->post_recv_credits_work); + cancel_work_sync(&t->send_immediate_work); + + if (t->qp) { + ib_drain_qp(t->qp); + ib_destroy_qp(t->qp); + } + + ksmbd_debug(RDMA, "drain the reassembly queue\n"); + do { + spin_lock(&t->reassembly_queue_lock); + recvmsg = get_first_reassembly(t); + if (recvmsg) { + list_del(&recvmsg->list); + spin_unlock(&t->reassembly_queue_lock); + put_recvmsg(t, recvmsg); + } else { + spin_unlock(&t->reassembly_queue_lock); + } + } while (recvmsg); + t->reassembly_data_length = 0; + + if (t->send_cq) + ib_free_cq(t->send_cq); + if (t->recv_cq) + ib_free_cq(t->recv_cq); + if (t->pd) + ib_dealloc_pd(t->pd); + if (t->cm_id) + rdma_destroy_id(t->cm_id); + + smb_direct_destroy_pools(t); + ksmbd_conn_free(KSMBD_TRANS(t)->conn); + kfree(t); +} + +static struct smb_direct_sendmsg +*smb_direct_alloc_sendmsg(struct smb_direct_transport *t) +{ + struct smb_direct_sendmsg *msg; + + msg = mempool_alloc(t->sendmsg_mempool, GFP_KERNEL); + if (!msg) + return ERR_PTR(-ENOMEM); + msg->transport = t; + INIT_LIST_HEAD(&msg->list); + msg->num_sge = 0; + return msg; +} + +static void smb_direct_free_sendmsg(struct smb_direct_transport *t, + struct smb_direct_sendmsg *msg) +{ + int i; + + if (msg->num_sge > 0) { + ib_dma_unmap_single(t->cm_id->device, + msg->sge[0].addr, msg->sge[0].length, + DMA_TO_DEVICE); + for (i = 1; i < msg->num_sge; i++) + ib_dma_unmap_page(t->cm_id->device, + msg->sge[i].addr, msg->sge[i].length, + DMA_TO_DEVICE); + } + mempool_free(msg, t->sendmsg_mempool); +} + +static int smb_direct_check_recvmsg(struct smb_direct_recvmsg *recvmsg) +{ + switch (recvmsg->type) { + case SMB_DIRECT_MSG_DATA_TRANSFER: { + struct smb_direct_data_transfer *req = + (struct smb_direct_data_transfer *)recvmsg->packet; + struct smb2_hdr *hdr = (struct smb2_hdr *)(recvmsg->packet + + le32_to_cpu(req->data_offset) - 4); + ksmbd_debug(RDMA, + "CreditGranted: %u, CreditRequested: %u, DataLength: %u, RemainingDataLength: %u, SMB: %x, Command: %u\n", + le16_to_cpu(req->credits_granted), + le16_to_cpu(req->credits_requested), + req->data_length, req->remaining_data_length, + hdr->ProtocolId, hdr->Command); + break; + } + case SMB_DIRECT_MSG_NEGOTIATE_REQ: { + struct smb_direct_negotiate_req *req = + (struct smb_direct_negotiate_req *)recvmsg->packet; + ksmbd_debug(RDMA, + "MinVersion: %u, MaxVersion: %u, CreditRequested: %u, MaxSendSize: %u, MaxRecvSize: %u, MaxFragmentedSize: %u\n", + le16_to_cpu(req->min_version), + le16_to_cpu(req->max_version), + le16_to_cpu(req->credits_requested), + le32_to_cpu(req->preferred_send_size), + le32_to_cpu(req->max_receive_size), + le32_to_cpu(req->max_fragmented_size)); + if (le16_to_cpu(req->min_version) > 0x0100 || + le16_to_cpu(req->max_version) < 0x0100) + return -EOPNOTSUPP; + if (le16_to_cpu(req->credits_requested) <= 0 || + le32_to_cpu(req->max_receive_size) <= 128 || + le32_to_cpu(req->max_fragmented_size) <= + 128 * 1024) + return -ECONNABORTED; + + break; + } + default: + return -EINVAL; + } + return 0; +} + +static void recv_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct smb_direct_recvmsg *recvmsg; + struct smb_direct_transport *t; + + recvmsg = container_of(wc->wr_cqe, struct smb_direct_recvmsg, cqe); + t = recvmsg->transport; + + if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_RECV) { + if (wc->status != IB_WC_WR_FLUSH_ERR) { + pr_err("Recv error. status='%s (%d)' opcode=%d\n", + ib_wc_status_msg(wc->status), wc->status, + wc->opcode); + smb_direct_disconnect_rdma_connection(t); + } + put_empty_recvmsg(t, recvmsg); + return; + } + + ksmbd_debug(RDMA, "Recv completed. status='%s (%d)', opcode=%d\n", + ib_wc_status_msg(wc->status), wc->status, + wc->opcode); + + ib_dma_sync_single_for_cpu(wc->qp->device, recvmsg->sge.addr, + recvmsg->sge.length, DMA_FROM_DEVICE); + + switch (recvmsg->type) { + case SMB_DIRECT_MSG_NEGOTIATE_REQ: + t->negotiation_requested = true; + t->full_packet_received = true; + wake_up_interruptible(&t->wait_status); + break; + case SMB_DIRECT_MSG_DATA_TRANSFER: { + struct smb_direct_data_transfer *data_transfer = + (struct smb_direct_data_transfer *)recvmsg->packet; + int data_length = le32_to_cpu(data_transfer->data_length); + int avail_recvmsg_count, receive_credits; + + if (data_length) { + if (t->full_packet_received) + recvmsg->first_segment = true; + + if (le32_to_cpu(data_transfer->remaining_data_length)) + t->full_packet_received = false; + else + t->full_packet_received = true; + + enqueue_reassembly(t, recvmsg, data_length); + wake_up_interruptible(&t->wait_reassembly_queue); + + spin_lock(&t->receive_credit_lock); + receive_credits = --(t->recv_credits); + avail_recvmsg_count = t->count_avail_recvmsg; + spin_unlock(&t->receive_credit_lock); + } else { + put_empty_recvmsg(t, recvmsg); + + spin_lock(&t->receive_credit_lock); + receive_credits = --(t->recv_credits); + avail_recvmsg_count = ++(t->count_avail_recvmsg); + spin_unlock(&t->receive_credit_lock); + } + + t->recv_credit_target = + le16_to_cpu(data_transfer->credits_requested); + atomic_add(le16_to_cpu(data_transfer->credits_granted), + &t->send_credits); + + if (le16_to_cpu(data_transfer->flags) & + SMB_DIRECT_RESPONSE_REQUESTED) + queue_work(smb_direct_wq, &t->send_immediate_work); + + if (atomic_read(&t->send_credits) > 0) + wake_up_interruptible(&t->wait_send_credits); + + if (is_receive_credit_post_required(receive_credits, avail_recvmsg_count)) + mod_delayed_work(smb_direct_wq, + &t->post_recv_credits_work, 0); + break; + } + default: + break; + } +} + +static int smb_direct_post_recv(struct smb_direct_transport *t, + struct smb_direct_recvmsg *recvmsg) +{ + struct ib_recv_wr wr; + int ret; + + recvmsg->sge.addr = ib_dma_map_single(t->cm_id->device, + recvmsg->packet, t->max_recv_size, + DMA_FROM_DEVICE); + ret = ib_dma_mapping_error(t->cm_id->device, recvmsg->sge.addr); + if (ret) + return ret; + recvmsg->sge.length = t->max_recv_size; + recvmsg->sge.lkey = t->pd->local_dma_lkey; + recvmsg->cqe.done = recv_done; + + wr.wr_cqe = &recvmsg->cqe; + wr.next = NULL; + wr.sg_list = &recvmsg->sge; + wr.num_sge = 1; + + ret = ib_post_recv(t->qp, &wr, NULL); + if (ret) { + pr_err("Can't post recv: %d\n", ret); + ib_dma_unmap_single(t->cm_id->device, + recvmsg->sge.addr, recvmsg->sge.length, + DMA_FROM_DEVICE); + smb_direct_disconnect_rdma_connection(t); + return ret; + } + return ret; +} + +static int smb_direct_read(struct ksmbd_transport *t, char *buf, + unsigned int size) +{ + struct smb_direct_recvmsg *recvmsg; + struct smb_direct_data_transfer *data_transfer; + int to_copy, to_read, data_read, offset; + u32 data_length, remaining_data_length, data_offset; + int rc; + struct smb_direct_transport *st = smb_trans_direct_transfort(t); + +again: + if (st->status != SMB_DIRECT_CS_CONNECTED) { + pr_err("disconnected\n"); + return -ENOTCONN; + } + + /* + * No need to hold the reassembly queue lock all the time as we are + * the only one reading from the front of the queue. The transport + * may add more entries to the back of the queue at the same time + */ + if (st->reassembly_data_length >= size) { + int queue_length; + int queue_removed = 0; + + /* + * Need to make sure reassembly_data_length is read before + * reading reassembly_queue_length and calling + * get_first_reassembly. This call is lock free + * as we never read at the end of the queue which are being + * updated in SOFTIRQ as more data is received + */ + virt_rmb(); + queue_length = st->reassembly_queue_length; + data_read = 0; + to_read = size; + offset = st->first_entry_offset; + while (data_read < size) { + recvmsg = get_first_reassembly(st); + data_transfer = smb_direct_recvmsg_payload(recvmsg); + data_length = le32_to_cpu(data_transfer->data_length); + remaining_data_length = + le32_to_cpu(data_transfer->remaining_data_length); + data_offset = le32_to_cpu(data_transfer->data_offset); + + /* + * The upper layer expects RFC1002 length at the + * beginning of the payload. Return it to indicate + * the total length of the packet. This minimize the + * change to upper layer packet processing logic. This + * will be eventually remove when an intermediate + * transport layer is added + */ + if (recvmsg->first_segment && size == 4) { + unsigned int rfc1002_len = + data_length + remaining_data_length; + *((__be32 *)buf) = cpu_to_be32(rfc1002_len); + data_read = 4; + recvmsg->first_segment = false; + ksmbd_debug(RDMA, + "returning rfc1002 length %d\n", + rfc1002_len); + goto read_rfc1002_done; + } + + to_copy = min_t(int, data_length - offset, to_read); + memcpy(buf + data_read, (char *)data_transfer + data_offset + offset, + to_copy); + + /* move on to the next buffer? */ + if (to_copy == data_length - offset) { + queue_length--; + /* + * No need to lock if we are not at the + * end of the queue + */ + if (queue_length) { + list_del(&recvmsg->list); + } else { + spin_lock_irq(&st->reassembly_queue_lock); + list_del(&recvmsg->list); + spin_unlock_irq(&st->reassembly_queue_lock); + } + queue_removed++; + put_recvmsg(st, recvmsg); + offset = 0; + } else { + offset += to_copy; + } + + to_read -= to_copy; + data_read += to_copy; + } + + spin_lock_irq(&st->reassembly_queue_lock); + st->reassembly_data_length -= data_read; + st->reassembly_queue_length -= queue_removed; + spin_unlock_irq(&st->reassembly_queue_lock); + + spin_lock(&st->receive_credit_lock); + st->count_avail_recvmsg += queue_removed; + if (is_receive_credit_post_required(st->recv_credits, st->count_avail_recvmsg)) { + spin_unlock(&st->receive_credit_lock); + mod_delayed_work(smb_direct_wq, + &st->post_recv_credits_work, 0); + } else { + spin_unlock(&st->receive_credit_lock); + } + + st->first_entry_offset = offset; + ksmbd_debug(RDMA, + "returning to thread data_read=%d reassembly_data_length=%d first_entry_offset=%d\n", + data_read, st->reassembly_data_length, + st->first_entry_offset); +read_rfc1002_done: + return data_read; + } + + ksmbd_debug(RDMA, "wait_event on more data\n"); + rc = wait_event_interruptible(st->wait_reassembly_queue, + st->reassembly_data_length >= size || + st->status != SMB_DIRECT_CS_CONNECTED); + if (rc) + return -EINTR; + + goto again; +} + +static void smb_direct_post_recv_credits(struct work_struct *work) +{ + struct smb_direct_transport *t = container_of(work, + struct smb_direct_transport, post_recv_credits_work.work); + struct smb_direct_recvmsg *recvmsg; + int receive_credits, credits = 0; + int ret; + int use_free = 1; + + spin_lock(&t->receive_credit_lock); + receive_credits = t->recv_credits; + spin_unlock(&t->receive_credit_lock); + + if (receive_credits < t->recv_credit_target) { + while (true) { + if (use_free) + recvmsg = get_free_recvmsg(t); + else + recvmsg = get_empty_recvmsg(t); + if (!recvmsg) { + if (use_free) { + use_free = 0; + continue; + } else { + break; + } + } + + recvmsg->type = SMB_DIRECT_MSG_DATA_TRANSFER; + recvmsg->first_segment = false; + + ret = smb_direct_post_recv(t, recvmsg); + if (ret) { + pr_err("Can't post recv: %d\n", ret); + put_recvmsg(t, recvmsg); + break; + } + credits++; + } + } + + spin_lock(&t->receive_credit_lock); + t->recv_credits += credits; + t->count_avail_recvmsg -= credits; + spin_unlock(&t->receive_credit_lock); + + spin_lock(&t->lock_new_recv_credits); + t->new_recv_credits += credits; + spin_unlock(&t->lock_new_recv_credits); + + if (credits) + queue_work(smb_direct_wq, &t->send_immediate_work); +} + +static void send_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct smb_direct_sendmsg *sendmsg, *sibling; + struct smb_direct_transport *t; + struct list_head *pos, *prev, *end; + + sendmsg = container_of(wc->wr_cqe, struct smb_direct_sendmsg, cqe); + t = sendmsg->transport; + + ksmbd_debug(RDMA, "Send completed. status='%s (%d)', opcode=%d\n", + ib_wc_status_msg(wc->status), wc->status, + wc->opcode); + + if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_SEND) { + pr_err("Send error. status='%s (%d)', opcode=%d\n", + ib_wc_status_msg(wc->status), wc->status, + wc->opcode); + smb_direct_disconnect_rdma_connection(t); + } + + if (sendmsg->num_sge > 1) { + if (atomic_dec_and_test(&t->send_payload_pending)) + wake_up(&t->wait_send_payload_pending); + } else { + if (atomic_dec_and_test(&t->send_pending)) + wake_up(&t->wait_send_pending); + } + + /* iterate and free the list of messages in reverse. the list's head + * is invalid. + */ + for (pos = &sendmsg->list, prev = pos->prev, end = sendmsg->list.next; + prev != end; pos = prev, prev = prev->prev) { + sibling = container_of(pos, struct smb_direct_sendmsg, list); + smb_direct_free_sendmsg(t, sibling); + } + + sibling = container_of(pos, struct smb_direct_sendmsg, list); + smb_direct_free_sendmsg(t, sibling); +} + +static int manage_credits_prior_sending(struct smb_direct_transport *t) +{ + int new_credits; + + spin_lock(&t->lock_new_recv_credits); + new_credits = t->new_recv_credits; + t->new_recv_credits = 0; + spin_unlock(&t->lock_new_recv_credits); + + return new_credits; +} + +static int smb_direct_post_send(struct smb_direct_transport *t, + struct ib_send_wr *wr) +{ + int ret; + + if (wr->num_sge > 1) + atomic_inc(&t->send_payload_pending); + else + atomic_inc(&t->send_pending); + + ret = ib_post_send(t->qp, wr, NULL); + if (ret) { + pr_err("failed to post send: %d\n", ret); + if (wr->num_sge > 1) { + if (atomic_dec_and_test(&t->send_payload_pending)) + wake_up(&t->wait_send_payload_pending); + } else { + if (atomic_dec_and_test(&t->send_pending)) + wake_up(&t->wait_send_pending); + } + smb_direct_disconnect_rdma_connection(t); + } + return ret; +} + +static void smb_direct_send_ctx_init(struct smb_direct_transport *t, + struct smb_direct_send_ctx *send_ctx, + bool need_invalidate_rkey, + unsigned int remote_key) +{ + INIT_LIST_HEAD(&send_ctx->msg_list); + send_ctx->wr_cnt = 0; + send_ctx->need_invalidate_rkey = need_invalidate_rkey; + send_ctx->remote_key = remote_key; +} + +static int smb_direct_flush_send_list(struct smb_direct_transport *t, + struct smb_direct_send_ctx *send_ctx, + bool is_last) +{ + struct smb_direct_sendmsg *first, *last; + int ret; + + if (list_empty(&send_ctx->msg_list)) + return 0; + + first = list_first_entry(&send_ctx->msg_list, + struct smb_direct_sendmsg, + list); + last = list_last_entry(&send_ctx->msg_list, + struct smb_direct_sendmsg, + list); + + last->wr.send_flags = IB_SEND_SIGNALED; + last->wr.wr_cqe = &last->cqe; + if (is_last && send_ctx->need_invalidate_rkey) { + last->wr.opcode = IB_WR_SEND_WITH_INV; + last->wr.ex.invalidate_rkey = send_ctx->remote_key; + } + + ret = smb_direct_post_send(t, &first->wr); + if (!ret) { + smb_direct_send_ctx_init(t, send_ctx, + send_ctx->need_invalidate_rkey, + send_ctx->remote_key); + } else { + atomic_add(send_ctx->wr_cnt, &t->send_credits); + wake_up(&t->wait_send_credits); + list_for_each_entry_safe(first, last, &send_ctx->msg_list, + list) { + smb_direct_free_sendmsg(t, first); + } + } + return ret; +} + +static int wait_for_credits(struct smb_direct_transport *t, + wait_queue_head_t *waitq, atomic_t *credits) +{ + int ret; + + do { + if (atomic_dec_return(credits) >= 0) + return 0; + + atomic_inc(credits); + ret = wait_event_interruptible(*waitq, + atomic_read(credits) > 0 || + t->status != SMB_DIRECT_CS_CONNECTED); + + if (t->status != SMB_DIRECT_CS_CONNECTED) + return -ENOTCONN; + else if (ret < 0) + return ret; + } while (true); +} + +static int wait_for_send_credits(struct smb_direct_transport *t, + struct smb_direct_send_ctx *send_ctx) +{ + int ret; + + if (send_ctx && + (send_ctx->wr_cnt >= 16 || atomic_read(&t->send_credits) <= 1)) { + ret = smb_direct_flush_send_list(t, send_ctx, false); + if (ret) + return ret; + } + + return wait_for_credits(t, &t->wait_send_credits, &t->send_credits); +} + +static int smb_direct_create_header(struct smb_direct_transport *t, + int size, int remaining_data_length, + struct smb_direct_sendmsg **sendmsg_out) +{ + struct smb_direct_sendmsg *sendmsg; + struct smb_direct_data_transfer *packet; + int header_length; + int ret; + + sendmsg = smb_direct_alloc_sendmsg(t); + if (IS_ERR(sendmsg)) + return PTR_ERR(sendmsg); + + /* Fill in the packet header */ + packet = (struct smb_direct_data_transfer *)sendmsg->packet; + packet->credits_requested = cpu_to_le16(t->send_credit_target); + packet->credits_granted = cpu_to_le16(manage_credits_prior_sending(t)); + + packet->flags = 0; + packet->reserved = 0; + if (!size) + packet->data_offset = 0; + else + packet->data_offset = cpu_to_le32(24); + packet->data_length = cpu_to_le32(size); + packet->remaining_data_length = cpu_to_le32(remaining_data_length); + packet->padding = 0; + + ksmbd_debug(RDMA, + "credits_requested=%d credits_granted=%d data_offset=%d data_length=%d remaining_data_length=%d\n", + le16_to_cpu(packet->credits_requested), + le16_to_cpu(packet->credits_granted), + le32_to_cpu(packet->data_offset), + le32_to_cpu(packet->data_length), + le32_to_cpu(packet->remaining_data_length)); + + /* Map the packet to DMA */ + header_length = sizeof(struct smb_direct_data_transfer); + /* If this is a packet without payload, don't send padding */ + if (!size) + header_length = + offsetof(struct smb_direct_data_transfer, padding); + + sendmsg->sge[0].addr = ib_dma_map_single(t->cm_id->device, + (void *)packet, + header_length, + DMA_TO_DEVICE); + ret = ib_dma_mapping_error(t->cm_id->device, sendmsg->sge[0].addr); + if (ret) { + smb_direct_free_sendmsg(t, sendmsg); + return ret; + } + + sendmsg->num_sge = 1; + sendmsg->sge[0].length = header_length; + sendmsg->sge[0].lkey = t->pd->local_dma_lkey; + + *sendmsg_out = sendmsg; + return 0; +} + +static int get_sg_list(void *buf, int size, struct scatterlist *sg_list, int nentries) +{ + bool high = is_vmalloc_addr(buf); + struct page *page; + int offset, len; + int i = 0; + + if (nentries < get_buf_page_count(buf, size)) + return -EINVAL; + + offset = offset_in_page(buf); + buf -= offset; + while (size > 0) { + len = min_t(int, PAGE_SIZE - offset, size); + if (high) + page = vmalloc_to_page(buf); + else + page = kmap_to_page(buf); + + if (!sg_list) + return -EINVAL; + sg_set_page(sg_list, page, len, offset); + sg_list = sg_next(sg_list); + + buf += PAGE_SIZE; + size -= len; + offset = 0; + i++; + } + return i; +} + +static int get_mapped_sg_list(struct ib_device *device, void *buf, int size, + struct scatterlist *sg_list, int nentries, + enum dma_data_direction dir) +{ + int npages; + + npages = get_sg_list(buf, size, sg_list, nentries); + if (npages <= 0) + return -EINVAL; + return ib_dma_map_sg(device, sg_list, npages, dir); +} + +static int post_sendmsg(struct smb_direct_transport *t, + struct smb_direct_send_ctx *send_ctx, + struct smb_direct_sendmsg *msg) +{ + int i; + + for (i = 0; i < msg->num_sge; i++) + ib_dma_sync_single_for_device(t->cm_id->device, + msg->sge[i].addr, msg->sge[i].length, + DMA_TO_DEVICE); + + msg->cqe.done = send_done; + msg->wr.opcode = IB_WR_SEND; + msg->wr.sg_list = &msg->sge[0]; + msg->wr.num_sge = msg->num_sge; + msg->wr.next = NULL; + + if (send_ctx) { + msg->wr.wr_cqe = NULL; + msg->wr.send_flags = 0; + if (!list_empty(&send_ctx->msg_list)) { + struct smb_direct_sendmsg *last; + + last = list_last_entry(&send_ctx->msg_list, + struct smb_direct_sendmsg, + list); + last->wr.next = &msg->wr; + } + list_add_tail(&msg->list, &send_ctx->msg_list); + send_ctx->wr_cnt++; + return 0; + } + + msg->wr.wr_cqe = &msg->cqe; + msg->wr.send_flags = IB_SEND_SIGNALED; + return smb_direct_post_send(t, &msg->wr); +} + +static int smb_direct_post_send_data(struct smb_direct_transport *t, + struct smb_direct_send_ctx *send_ctx, + struct kvec *iov, int niov, + int remaining_data_length) +{ + int i, j, ret; + struct smb_direct_sendmsg *msg; + int data_length; + struct scatterlist sg[SMB_DIRECT_MAX_SEND_SGES - 1]; + + ret = wait_for_send_credits(t, send_ctx); + if (ret) + return ret; + + data_length = 0; + for (i = 0; i < niov; i++) + data_length += iov[i].iov_len; + + ret = smb_direct_create_header(t, data_length, remaining_data_length, + &msg); + if (ret) { + atomic_inc(&t->send_credits); + return ret; + } + + for (i = 0; i < niov; i++) { + struct ib_sge *sge; + int sg_cnt; + + sg_init_table(sg, SMB_DIRECT_MAX_SEND_SGES - 1); + sg_cnt = get_mapped_sg_list(t->cm_id->device, + iov[i].iov_base, iov[i].iov_len, + sg, SMB_DIRECT_MAX_SEND_SGES - 1, + DMA_TO_DEVICE); + if (sg_cnt <= 0) { + pr_err("failed to map buffer\n"); + ret = -ENOMEM; + goto err; + } else if (sg_cnt + msg->num_sge > SMB_DIRECT_MAX_SEND_SGES - 1) { + pr_err("buffer not fitted into sges\n"); + ret = -E2BIG; + ib_dma_unmap_sg(t->cm_id->device, sg, sg_cnt, + DMA_TO_DEVICE); + goto err; + } + + for (j = 0; j < sg_cnt; j++) { + sge = &msg->sge[msg->num_sge]; + sge->addr = sg_dma_address(&sg[j]); + sge->length = sg_dma_len(&sg[j]); + sge->lkey = t->pd->local_dma_lkey; + msg->num_sge++; + } + } + + ret = post_sendmsg(t, send_ctx, msg); + if (ret) + goto err; + return 0; +err: + smb_direct_free_sendmsg(t, msg); + atomic_inc(&t->send_credits); + return ret; +} + +static int smb_direct_writev(struct ksmbd_transport *t, + struct kvec *iov, int niovs, int buflen, + bool need_invalidate, unsigned int remote_key) +{ + struct smb_direct_transport *st = smb_trans_direct_transfort(t); + int remaining_data_length; + int start, i, j; + int max_iov_size = st->max_send_size - + sizeof(struct smb_direct_data_transfer); + int ret; + struct kvec vec; + struct smb_direct_send_ctx send_ctx; + + if (st->status != SMB_DIRECT_CS_CONNECTED) + return -ENOTCONN; + + //FIXME: skip RFC1002 header.. + buflen -= 4; + iov[0].iov_base += 4; + iov[0].iov_len -= 4; + + remaining_data_length = buflen; + ksmbd_debug(RDMA, "Sending smb (RDMA): smb_len=%u\n", buflen); + + smb_direct_send_ctx_init(st, &send_ctx, need_invalidate, remote_key); + start = i = 0; + buflen = 0; + while (true) { + buflen += iov[i].iov_len; + if (buflen > max_iov_size) { + if (i > start) { + remaining_data_length -= + (buflen - iov[i].iov_len); + ret = smb_direct_post_send_data(st, &send_ctx, + &iov[start], i - start, + remaining_data_length); + if (ret) + goto done; + } else { + /* iov[start] is too big, break it */ + int nvec = (buflen + max_iov_size - 1) / + max_iov_size; + + for (j = 0; j < nvec; j++) { + vec.iov_base = + (char *)iov[start].iov_base + + j * max_iov_size; + vec.iov_len = + min_t(int, max_iov_size, + buflen - max_iov_size * j); + remaining_data_length -= vec.iov_len; + ret = smb_direct_post_send_data(st, &send_ctx, &vec, 1, + remaining_data_length); + if (ret) + goto done; + } + i++; + if (i == niovs) + break; + } + start = i; + buflen = 0; + } else { + i++; + if (i == niovs) { + /* send out all remaining vecs */ + remaining_data_length -= buflen; + ret = smb_direct_post_send_data(st, &send_ctx, + &iov[start], i - start, + remaining_data_length); + if (ret) + goto done; + break; + } + } + } + +done: + ret = smb_direct_flush_send_list(st, &send_ctx, true); + + /* + * As an optimization, we don't wait for individual I/O to finish + * before sending the next one. + * Send them all and wait for pending send count to get to 0 + * that means all the I/Os have been out and we are good to return + */ + + wait_event(st->wait_send_payload_pending, + atomic_read(&st->send_payload_pending) == 0); + return ret; +} + +static void read_write_done(struct ib_cq *cq, struct ib_wc *wc, + enum dma_data_direction dir) +{ + struct smb_direct_rdma_rw_msg *msg = container_of(wc->wr_cqe, + struct smb_direct_rdma_rw_msg, cqe); + struct smb_direct_transport *t = msg->t; + + if (wc->status != IB_WC_SUCCESS) { + pr_err("read/write error. opcode = %d, status = %s(%d)\n", + wc->opcode, ib_wc_status_msg(wc->status), wc->status); + smb_direct_disconnect_rdma_connection(t); + } + + if (atomic_inc_return(&t->rw_avail_ops) > 0) + wake_up(&t->wait_rw_avail_ops); + + rdma_rw_ctx_destroy(&msg->rw_ctx, t->qp, t->qp->port, + msg->sg_list, msg->sgt.nents, dir); + sg_free_table_chained(&msg->sgt, SG_CHUNK_SIZE); + complete(msg->completion); + kfree(msg); +} + +static void read_done(struct ib_cq *cq, struct ib_wc *wc) +{ + read_write_done(cq, wc, DMA_FROM_DEVICE); +} + +static void write_done(struct ib_cq *cq, struct ib_wc *wc) +{ + read_write_done(cq, wc, DMA_TO_DEVICE); +} + +static int smb_direct_rdma_xmit(struct smb_direct_transport *t, void *buf, + int buf_len, u32 remote_key, u64 remote_offset, + u32 remote_len, bool is_read) +{ + struct smb_direct_rdma_rw_msg *msg; + int ret; + DECLARE_COMPLETION_ONSTACK(completion); + struct ib_send_wr *first_wr = NULL; + + ret = wait_for_credits(t, &t->wait_rw_avail_ops, &t->rw_avail_ops); + if (ret < 0) + return ret; + + /* TODO: mempool */ + msg = kmalloc(offsetof(struct smb_direct_rdma_rw_msg, sg_list) + + sizeof(struct scatterlist) * SG_CHUNK_SIZE, GFP_KERNEL); + if (!msg) { + atomic_inc(&t->rw_avail_ops); + return -ENOMEM; + } + + msg->sgt.sgl = &msg->sg_list[0]; + ret = sg_alloc_table_chained(&msg->sgt, + get_buf_page_count(buf, buf_len), + msg->sg_list, SG_CHUNK_SIZE); + if (ret) { + atomic_inc(&t->rw_avail_ops); + kfree(msg); + return -ENOMEM; + } + + ret = get_sg_list(buf, buf_len, msg->sgt.sgl, msg->sgt.orig_nents); + if (ret <= 0) { + pr_err("failed to get pages\n"); + goto err; + } + + ret = rdma_rw_ctx_init(&msg->rw_ctx, t->qp, t->qp->port, + msg->sg_list, get_buf_page_count(buf, buf_len), + 0, remote_offset, remote_key, + is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE); + if (ret < 0) { + pr_err("failed to init rdma_rw_ctx: %d\n", ret); + goto err; + } + + msg->t = t; + msg->cqe.done = is_read ? read_done : write_done; + msg->completion = &completion; + first_wr = rdma_rw_ctx_wrs(&msg->rw_ctx, t->qp, t->qp->port, + &msg->cqe, NULL); + + ret = ib_post_send(t->qp, first_wr, NULL); + if (ret) { + pr_err("failed to post send wr: %d\n", ret); + goto err; + } + + wait_for_completion(&completion); + return 0; + +err: + atomic_inc(&t->rw_avail_ops); + if (first_wr) + rdma_rw_ctx_destroy(&msg->rw_ctx, t->qp, t->qp->port, + msg->sg_list, msg->sgt.nents, + is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE); + sg_free_table_chained(&msg->sgt, SG_CHUNK_SIZE); + kfree(msg); + return ret; +} + +static int smb_direct_rdma_write(struct ksmbd_transport *t, void *buf, + unsigned int buflen, u32 remote_key, + u64 remote_offset, u32 remote_len) +{ + return smb_direct_rdma_xmit(smb_trans_direct_transfort(t), buf, buflen, + remote_key, remote_offset, + remote_len, false); +} + +static int smb_direct_rdma_read(struct ksmbd_transport *t, void *buf, + unsigned int buflen, u32 remote_key, + u64 remote_offset, u32 remote_len) +{ + return smb_direct_rdma_xmit(smb_trans_direct_transfort(t), buf, buflen, + remote_key, remote_offset, + remote_len, true); +} + +static void smb_direct_disconnect(struct ksmbd_transport *t) +{ + struct smb_direct_transport *st = smb_trans_direct_transfort(t); + + ksmbd_debug(RDMA, "Disconnecting cm_id=%p\n", st->cm_id); + + smb_direct_disconnect_rdma_connection(st); + wait_event_interruptible(st->wait_status, + st->status == SMB_DIRECT_CS_DISCONNECTED); + free_transport(st); +} + +static int smb_direct_cm_handler(struct rdma_cm_id *cm_id, + struct rdma_cm_event *event) +{ + struct smb_direct_transport *t = cm_id->context; + + ksmbd_debug(RDMA, "RDMA CM event. cm_id=%p event=%s (%d)\n", + cm_id, rdma_event_msg(event->event), event->event); + + switch (event->event) { + case RDMA_CM_EVENT_ESTABLISHED: { + t->status = SMB_DIRECT_CS_CONNECTED; + wake_up_interruptible(&t->wait_status); + break; + } + case RDMA_CM_EVENT_DEVICE_REMOVAL: + case RDMA_CM_EVENT_DISCONNECTED: { + t->status = SMB_DIRECT_CS_DISCONNECTED; + wake_up_interruptible(&t->wait_status); + wake_up_interruptible(&t->wait_reassembly_queue); + wake_up(&t->wait_send_credits); + break; + } + case RDMA_CM_EVENT_CONNECT_ERROR: { + t->status = SMB_DIRECT_CS_DISCONNECTED; + wake_up_interruptible(&t->wait_status); + break; + } + default: + pr_err("Unexpected RDMA CM event. cm_id=%p, event=%s (%d)\n", + cm_id, rdma_event_msg(event->event), + event->event); + break; + } + return 0; +} + +static void smb_direct_qpair_handler(struct ib_event *event, void *context) +{ + struct smb_direct_transport *t = context; + + ksmbd_debug(RDMA, "Received QP event. cm_id=%p, event=%s (%d)\n", + t->cm_id, ib_event_msg(event->event), event->event); + + switch (event->event) { + case IB_EVENT_CQ_ERR: + case IB_EVENT_QP_FATAL: + smb_direct_disconnect_rdma_connection(t); + break; + default: + break; + } +} + +static int smb_direct_send_negotiate_response(struct smb_direct_transport *t, + int failed) +{ + struct smb_direct_sendmsg *sendmsg; + struct smb_direct_negotiate_resp *resp; + int ret; + + sendmsg = smb_direct_alloc_sendmsg(t); + if (IS_ERR(sendmsg)) + return -ENOMEM; + + resp = (struct smb_direct_negotiate_resp *)sendmsg->packet; + if (failed) { + memset(resp, 0, sizeof(*resp)); + resp->min_version = cpu_to_le16(0x0100); + resp->max_version = cpu_to_le16(0x0100); + resp->status = STATUS_NOT_SUPPORTED; + } else { + resp->status = STATUS_SUCCESS; + resp->min_version = SMB_DIRECT_VERSION_LE; + resp->max_version = SMB_DIRECT_VERSION_LE; + resp->negotiated_version = SMB_DIRECT_VERSION_LE; + resp->reserved = 0; + resp->credits_requested = + cpu_to_le16(t->send_credit_target); + resp->credits_granted = cpu_to_le16(manage_credits_prior_sending(t)); + resp->max_readwrite_size = cpu_to_le32(t->max_rdma_rw_size); + resp->preferred_send_size = cpu_to_le32(t->max_send_size); + resp->max_receive_size = cpu_to_le32(t->max_recv_size); + resp->max_fragmented_size = + cpu_to_le32(t->max_fragmented_recv_size); + } + + sendmsg->sge[0].addr = ib_dma_map_single(t->cm_id->device, + (void *)resp, sizeof(*resp), + DMA_TO_DEVICE); + ret = ib_dma_mapping_error(t->cm_id->device, sendmsg->sge[0].addr); + if (ret) { + smb_direct_free_sendmsg(t, sendmsg); + return ret; + } + + sendmsg->num_sge = 1; + sendmsg->sge[0].length = sizeof(*resp); + sendmsg->sge[0].lkey = t->pd->local_dma_lkey; + + ret = post_sendmsg(t, NULL, sendmsg); + if (ret) { + smb_direct_free_sendmsg(t, sendmsg); + return ret; + } + + wait_event(t->wait_send_pending, + atomic_read(&t->send_pending) == 0); + return 0; +} + +static int smb_direct_accept_client(struct smb_direct_transport *t) +{ + struct rdma_conn_param conn_param; + struct ib_port_immutable port_immutable; + u32 ird_ord_hdr[2]; + int ret; + + memset(&conn_param, 0, sizeof(conn_param)); + conn_param.initiator_depth = min_t(u8, t->cm_id->device->attrs.max_qp_rd_atom, + SMB_DIRECT_CM_INITIATOR_DEPTH); + conn_param.responder_resources = 0; + + t->cm_id->device->ops.get_port_immutable(t->cm_id->device, + t->cm_id->port_num, + &port_immutable); + if (port_immutable.core_cap_flags & RDMA_CORE_PORT_IWARP) { + ird_ord_hdr[0] = conn_param.responder_resources; + ird_ord_hdr[1] = 1; + conn_param.private_data = ird_ord_hdr; + conn_param.private_data_len = sizeof(ird_ord_hdr); + } else { + conn_param.private_data = NULL; + conn_param.private_data_len = 0; + } + conn_param.retry_count = SMB_DIRECT_CM_RETRY; + conn_param.rnr_retry_count = SMB_DIRECT_CM_RNR_RETRY; + conn_param.flow_control = 0; + + ret = rdma_accept(t->cm_id, &conn_param); + if (ret) { + pr_err("error at rdma_accept: %d\n", ret); + return ret; + } + + wait_event_interruptible(t->wait_status, + t->status != SMB_DIRECT_CS_NEW); + if (t->status != SMB_DIRECT_CS_CONNECTED) + return -ENOTCONN; + return 0; +} + +static int smb_direct_negotiate(struct smb_direct_transport *t) +{ + int ret; + struct smb_direct_recvmsg *recvmsg; + struct smb_direct_negotiate_req *req; + + recvmsg = get_free_recvmsg(t); + if (!recvmsg) + return -ENOMEM; + recvmsg->type = SMB_DIRECT_MSG_NEGOTIATE_REQ; + + ret = smb_direct_post_recv(t, recvmsg); + if (ret) { + pr_err("Can't post recv: %d\n", ret); + goto out; + } + + t->negotiation_requested = false; + ret = smb_direct_accept_client(t); + if (ret) { + pr_err("Can't accept client\n"); + goto out; + } + + smb_direct_post_recv_credits(&t->post_recv_credits_work.work); + + ksmbd_debug(RDMA, "Waiting for SMB_DIRECT negotiate request\n"); + ret = wait_event_interruptible_timeout(t->wait_status, + t->negotiation_requested || + t->status == SMB_DIRECT_CS_DISCONNECTED, + SMB_DIRECT_NEGOTIATE_TIMEOUT * HZ); + if (ret <= 0 || t->status == SMB_DIRECT_CS_DISCONNECTED) { + ret = ret < 0 ? ret : -ETIMEDOUT; + goto out; + } + + ret = smb_direct_check_recvmsg(recvmsg); + if (ret == -ECONNABORTED) + goto out; + + req = (struct smb_direct_negotiate_req *)recvmsg->packet; + t->max_recv_size = min_t(int, t->max_recv_size, + le32_to_cpu(req->preferred_send_size)); + t->max_send_size = min_t(int, t->max_send_size, + le32_to_cpu(req->max_receive_size)); + t->max_fragmented_send_size = + le32_to_cpu(req->max_fragmented_size); + + ret = smb_direct_send_negotiate_response(t, ret); +out: + if (recvmsg) + put_recvmsg(t, recvmsg); + return ret; +} + +static int smb_direct_init_params(struct smb_direct_transport *t, + struct ib_qp_cap *cap) +{ + struct ib_device *device = t->cm_id->device; + int max_send_sges, max_pages, max_rw_wrs, max_send_wrs; + + /* need 2 more sge. because a SMB_DIRECT header will be mapped, + * and maybe a send buffer could be not page aligned. + */ + t->max_send_size = smb_direct_max_send_size; + max_send_sges = DIV_ROUND_UP(t->max_send_size, PAGE_SIZE) + 2; + if (max_send_sges > SMB_DIRECT_MAX_SEND_SGES) { + pr_err("max_send_size %d is too large\n", t->max_send_size); + return -EINVAL; + } + + /* + * allow smb_direct_max_outstanding_rw_ops of in-flight RDMA + * read/writes. HCA guarantees at least max_send_sge of sges for + * a RDMA read/write work request, and if memory registration is used, + * we need reg_mr, local_inv wrs for each read/write. + */ + t->max_rdma_rw_size = smb_direct_max_read_write_size; + max_pages = DIV_ROUND_UP(t->max_rdma_rw_size, PAGE_SIZE) + 1; + max_rw_wrs = DIV_ROUND_UP(max_pages, SMB_DIRECT_MAX_SEND_SGES); + max_rw_wrs += rdma_rw_mr_factor(device, t->cm_id->port_num, + max_pages) * 2; + max_rw_wrs *= smb_direct_max_outstanding_rw_ops; + + max_send_wrs = smb_direct_send_credit_target + max_rw_wrs; + if (max_send_wrs > device->attrs.max_cqe || + max_send_wrs > device->attrs.max_qp_wr) { + pr_err("consider lowering send_credit_target = %d, or max_outstanding_rw_ops = %d\n", + smb_direct_send_credit_target, + smb_direct_max_outstanding_rw_ops); + pr_err("Possible CQE overrun, device reporting max_cqe %d max_qp_wr %d\n", + device->attrs.max_cqe, device->attrs.max_qp_wr); + return -EINVAL; + } + + if (smb_direct_receive_credit_max > device->attrs.max_cqe || + smb_direct_receive_credit_max > device->attrs.max_qp_wr) { + pr_err("consider lowering receive_credit_max = %d\n", + smb_direct_receive_credit_max); + pr_err("Possible CQE overrun, device reporting max_cpe %d max_qp_wr %d\n", + device->attrs.max_cqe, device->attrs.max_qp_wr); + return -EINVAL; + } + + if (device->attrs.max_send_sge < SMB_DIRECT_MAX_SEND_SGES) { + pr_err("warning: device max_send_sge = %d too small\n", + device->attrs.max_send_sge); + return -EINVAL; + } + if (device->attrs.max_recv_sge < SMB_DIRECT_MAX_RECV_SGES) { + pr_err("warning: device max_recv_sge = %d too small\n", + device->attrs.max_recv_sge); + return -EINVAL; + } + + t->recv_credits = 0; + t->count_avail_recvmsg = 0; + + t->recv_credit_max = smb_direct_receive_credit_max; + t->recv_credit_target = 10; + t->new_recv_credits = 0; + + t->send_credit_target = smb_direct_send_credit_target; + atomic_set(&t->send_credits, 0); + atomic_set(&t->rw_avail_ops, smb_direct_max_outstanding_rw_ops); + + t->max_send_size = smb_direct_max_send_size; + t->max_recv_size = smb_direct_max_receive_size; + t->max_fragmented_recv_size = smb_direct_max_fragmented_recv_size; + + cap->max_send_wr = max_send_wrs; + cap->max_recv_wr = t->recv_credit_max; + cap->max_send_sge = SMB_DIRECT_MAX_SEND_SGES; + cap->max_recv_sge = SMB_DIRECT_MAX_RECV_SGES; + cap->max_inline_data = 0; + cap->max_rdma_ctxs = 0; + return 0; +} + +static void smb_direct_destroy_pools(struct smb_direct_transport *t) +{ + struct smb_direct_recvmsg *recvmsg; + + while ((recvmsg = get_free_recvmsg(t))) + mempool_free(recvmsg, t->recvmsg_mempool); + while ((recvmsg = get_empty_recvmsg(t))) + mempool_free(recvmsg, t->recvmsg_mempool); + + mempool_destroy(t->recvmsg_mempool); + t->recvmsg_mempool = NULL; + + kmem_cache_destroy(t->recvmsg_cache); + t->recvmsg_cache = NULL; + + mempool_destroy(t->sendmsg_mempool); + t->sendmsg_mempool = NULL; + + kmem_cache_destroy(t->sendmsg_cache); + t->sendmsg_cache = NULL; +} + +static int smb_direct_create_pools(struct smb_direct_transport *t) +{ + char name[80]; + int i; + struct smb_direct_recvmsg *recvmsg; + + snprintf(name, sizeof(name), "smb_direct_rqst_pool_%p", t); + t->sendmsg_cache = kmem_cache_create(name, + sizeof(struct smb_direct_sendmsg) + + sizeof(struct smb_direct_negotiate_resp), + 0, SLAB_HWCACHE_ALIGN, NULL); + if (!t->sendmsg_cache) + return -ENOMEM; + + t->sendmsg_mempool = mempool_create(t->send_credit_target, + mempool_alloc_slab, mempool_free_slab, + t->sendmsg_cache); + if (!t->sendmsg_mempool) + goto err; + + snprintf(name, sizeof(name), "smb_direct_resp_%p", t); + t->recvmsg_cache = kmem_cache_create(name, + sizeof(struct smb_direct_recvmsg) + + t->max_recv_size, + 0, SLAB_HWCACHE_ALIGN, NULL); + if (!t->recvmsg_cache) + goto err; + + t->recvmsg_mempool = + mempool_create(t->recv_credit_max, mempool_alloc_slab, + mempool_free_slab, t->recvmsg_cache); + if (!t->recvmsg_mempool) + goto err; + + INIT_LIST_HEAD(&t->recvmsg_queue); + + for (i = 0; i < t->recv_credit_max; i++) { + recvmsg = mempool_alloc(t->recvmsg_mempool, GFP_KERNEL); + if (!recvmsg) + goto err; + recvmsg->transport = t; + list_add(&recvmsg->list, &t->recvmsg_queue); + } + t->count_avail_recvmsg = t->recv_credit_max; + + return 0; +err: + smb_direct_destroy_pools(t); + return -ENOMEM; +} + +static int smb_direct_create_qpair(struct smb_direct_transport *t, + struct ib_qp_cap *cap) +{ + int ret; + struct ib_qp_init_attr qp_attr; + + t->pd = ib_alloc_pd(t->cm_id->device, 0); + if (IS_ERR(t->pd)) { + pr_err("Can't create RDMA PD\n"); + ret = PTR_ERR(t->pd); + t->pd = NULL; + return ret; + } + + t->send_cq = ib_alloc_cq(t->cm_id->device, t, + t->send_credit_target, 0, IB_POLL_WORKQUEUE); + if (IS_ERR(t->send_cq)) { + pr_err("Can't create RDMA send CQ\n"); + ret = PTR_ERR(t->send_cq); + t->send_cq = NULL; + goto err; + } + + t->recv_cq = ib_alloc_cq(t->cm_id->device, t, + cap->max_send_wr + cap->max_rdma_ctxs, + 0, IB_POLL_WORKQUEUE); + if (IS_ERR(t->recv_cq)) { + pr_err("Can't create RDMA recv CQ\n"); + ret = PTR_ERR(t->recv_cq); + t->recv_cq = NULL; + goto err; + } + + memset(&qp_attr, 0, sizeof(qp_attr)); + qp_attr.event_handler = smb_direct_qpair_handler; + qp_attr.qp_context = t; + qp_attr.cap = *cap; + qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; + qp_attr.qp_type = IB_QPT_RC; + qp_attr.send_cq = t->send_cq; + qp_attr.recv_cq = t->recv_cq; + qp_attr.port_num = ~0; + + ret = rdma_create_qp(t->cm_id, t->pd, &qp_attr); + if (ret) { + pr_err("Can't create RDMA QP: %d\n", ret); + goto err; + } + + t->qp = t->cm_id->qp; + t->cm_id->event_handler = smb_direct_cm_handler; + + return 0; +err: + if (t->qp) { + ib_destroy_qp(t->qp); + t->qp = NULL; + } + if (t->recv_cq) { + ib_destroy_cq(t->recv_cq); + t->recv_cq = NULL; + } + if (t->send_cq) { + ib_destroy_cq(t->send_cq); + t->send_cq = NULL; + } + if (t->pd) { + ib_dealloc_pd(t->pd); + t->pd = NULL; + } + return ret; +} + +static int smb_direct_prepare(struct ksmbd_transport *t) +{ + struct smb_direct_transport *st = smb_trans_direct_transfort(t); + int ret; + struct ib_qp_cap qp_cap; + + ret = smb_direct_init_params(st, &qp_cap); + if (ret) { + pr_err("Can't configure RDMA parameters\n"); + return ret; + } + + ret = smb_direct_create_pools(st); + if (ret) { + pr_err("Can't init RDMA pool: %d\n", ret); + return ret; + } + + ret = smb_direct_create_qpair(st, &qp_cap); + if (ret) { + pr_err("Can't accept RDMA client: %d\n", ret); + return ret; + } + + ret = smb_direct_negotiate(st); + if (ret) { + pr_err("Can't negotiate: %d\n", ret); + return ret; + } + + st->status = SMB_DIRECT_CS_CONNECTED; + return 0; +} + +static bool rdma_frwr_is_supported(struct ib_device_attr *attrs) +{ + if (!(attrs->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) + return false; + if (attrs->max_fast_reg_page_list_len == 0) + return false; + return true; +} + +static int smb_direct_handle_connect_request(struct rdma_cm_id *new_cm_id) +{ + struct smb_direct_transport *t; + + if (!rdma_frwr_is_supported(&new_cm_id->device->attrs)) { + ksmbd_debug(RDMA, + "Fast Registration Work Requests is not supported. device capabilities=%llx\n", + new_cm_id->device->attrs.device_cap_flags); + return -EPROTONOSUPPORT; + } + + t = alloc_transport(new_cm_id); + if (!t) + return -ENOMEM; + + KSMBD_TRANS(t)->handler = kthread_run(ksmbd_conn_handler_loop, + KSMBD_TRANS(t)->conn, "ksmbd:r%u", + SMB_DIRECT_PORT); + if (IS_ERR(KSMBD_TRANS(t)->handler)) { + int ret = PTR_ERR(KSMBD_TRANS(t)->handler); + + pr_err("Can't start thread\n"); + free_transport(t); + return ret; + } + + return 0; +} + +static int smb_direct_listen_handler(struct rdma_cm_id *cm_id, + struct rdma_cm_event *event) +{ + switch (event->event) { + case RDMA_CM_EVENT_CONNECT_REQUEST: { + int ret = smb_direct_handle_connect_request(cm_id); + + if (ret) { + pr_err("Can't create transport: %d\n", ret); + return ret; + } + + ksmbd_debug(RDMA, "Received connection request. cm_id=%p\n", + cm_id); + break; + } + default: + pr_err("Unexpected listen event. cm_id=%p, event=%s (%d)\n", + cm_id, rdma_event_msg(event->event), event->event); + break; + } + return 0; +} + +static int smb_direct_listen(int port) +{ + int ret; + struct rdma_cm_id *cm_id; + struct sockaddr_in sin = { + .sin_family = AF_INET, + .sin_addr.s_addr = htonl(INADDR_ANY), + .sin_port = htons(port), + }; + + cm_id = rdma_create_id(&init_net, smb_direct_listen_handler, + &smb_direct_listener, RDMA_PS_TCP, IB_QPT_RC); + if (IS_ERR(cm_id)) { + pr_err("Can't create cm id: %ld\n", PTR_ERR(cm_id)); + return PTR_ERR(cm_id); + } + + ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); + if (ret) { + pr_err("Can't bind: %d\n", ret); + goto err; + } + + smb_direct_listener.cm_id = cm_id; + + ret = rdma_listen(cm_id, 10); + if (ret) { + pr_err("Can't listen: %d\n", ret); + goto err; + } + return 0; +err: + smb_direct_listener.cm_id = NULL; + rdma_destroy_id(cm_id); + return ret; +} + +int ksmbd_rdma_init(void) +{ + int ret; + + smb_direct_listener.cm_id = NULL; + + /* When a client is running out of send credits, the credits are + * granted by the server's sending a packet using this queue. + * This avoids the situation that a clients cannot send packets + * for lack of credits + */ + smb_direct_wq = alloc_workqueue("ksmbd-smb_direct-wq", + WQ_HIGHPRI | WQ_MEM_RECLAIM, 0); + if (!smb_direct_wq) + return -ENOMEM; + + ret = smb_direct_listen(SMB_DIRECT_PORT); + if (ret) { + destroy_workqueue(smb_direct_wq); + smb_direct_wq = NULL; + pr_err("Can't listen: %d\n", ret); + return ret; + } + + ksmbd_debug(RDMA, "init RDMA listener. cm_id=%p\n", + smb_direct_listener.cm_id); + return 0; +} + +int ksmbd_rdma_destroy(void) +{ + if (smb_direct_listener.cm_id) + rdma_destroy_id(smb_direct_listener.cm_id); + smb_direct_listener.cm_id = NULL; + + if (smb_direct_wq) { + flush_workqueue(smb_direct_wq); + destroy_workqueue(smb_direct_wq); + smb_direct_wq = NULL; + } + return 0; +} + +bool ksmbd_rdma_capable_netdev(struct net_device *netdev) +{ + struct ib_device *ibdev; + bool rdma_capable = false; + + ibdev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_UNKNOWN); + if (ibdev) { + if (rdma_frwr_is_supported(&ibdev->attrs)) + rdma_capable = true; + ib_device_put(ibdev); + } + return rdma_capable; +} + +static struct ksmbd_transport_ops ksmbd_smb_direct_transport_ops = { + .prepare = smb_direct_prepare, + .disconnect = smb_direct_disconnect, + .writev = smb_direct_writev, + .read = smb_direct_read, + .rdma_read = smb_direct_rdma_read, + .rdma_write = smb_direct_rdma_write, +}; diff --git a/fs/ksmbd/transport_rdma.h b/fs/ksmbd/transport_rdma.h new file mode 100644 index 000000000000..0fa8adc0776f --- /dev/null +++ b/fs/ksmbd/transport_rdma.h @@ -0,0 +1,63 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2017, Microsoft Corporation. + * Copyright (C) 2018, LG Electronics. + */ + +#ifndef __KSMBD_TRANSPORT_RDMA_H__ +#define __KSMBD_TRANSPORT_RDMA_H__ + +#define SMB_DIRECT_PORT 5445 + +/* SMB DIRECT negotiation request packet [MS-SMBD] 2.2.1 */ +struct smb_direct_negotiate_req { + __le16 min_version; + __le16 max_version; + __le16 reserved; + __le16 credits_requested; + __le32 preferred_send_size; + __le32 max_receive_size; + __le32 max_fragmented_size; +} __packed; + +/* SMB DIRECT negotiation response packet [MS-SMBD] 2.2.2 */ +struct smb_direct_negotiate_resp { + __le16 min_version; + __le16 max_version; + __le16 negotiated_version; + __le16 reserved; + __le16 credits_requested; + __le16 credits_granted; + __le32 status; + __le32 max_readwrite_size; + __le32 preferred_send_size; + __le32 max_receive_size; + __le32 max_fragmented_size; +} __packed; + +#define SMB_DIRECT_RESPONSE_REQUESTED 0x0001 + +/* SMB DIRECT data transfer packet with payload [MS-SMBD] 2.2.3 */ +struct smb_direct_data_transfer { + __le16 credits_requested; + __le16 credits_granted; + __le16 flags; + __le16 reserved; + __le32 remaining_data_length; + __le32 data_offset; + __le32 data_length; + __le32 padding; + __u8 buffer[]; +} __packed; + +#ifdef CONFIG_SMB_SERVER_SMBDIRECT +int ksmbd_rdma_init(void); +int ksmbd_rdma_destroy(void); +bool ksmbd_rdma_capable_netdev(struct net_device *netdev); +#else +static inline int ksmbd_rdma_init(void) { return 0; } +static inline int ksmbd_rdma_destroy(void) { return 0; } +static inline bool ksmbd_rdma_capable_netdev(struct net_device *netdev) { return false; } +#endif + +#endif /* __KSMBD_TRANSPORT_RDMA_H__ */ -- 2.17.1