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Message-Id: <20210805060546.3268-6-namjae.jeon@samsung.com>
Date: Thu, 5 Aug 2021 15:05:38 +0900
From: Namjae Jeon <namjae.jeon@...sung.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-cifs@...r.kernel.org
Cc: linux-cifsd-devel@...ts.sourceforge.net, aurelien.aptel@...il.com,
sandeen@...deen.net, willy@...radead.org, hch@...radead.org,
senozhatsky@...omium.org, christian@...uner.io,
viro@...iv.linux.org.uk, ronniesahlberg@...il.com, hch@....de,
dan.carpenter@...cle.com, metze@...ba.org, smfrench@...il.com,
hyc.lee@...il.com, Namjae Jeon <namjae.jeon@...sung.com>,
Steve French <stfrench@...rosoft.com>
Subject: [PATCH v7 05/13] ksmbd: add rdma transport layer
This adds rdma transport layer.
Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
Signed-off-by: Hyunchul Lee <hyc.lee@...il.com>
Acked-by: Ronnie Sahlberg <lsahlber@...hat.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
---
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 <longli@...rosoft.com>,
+ * Hyunchul Lee <hyc.lee@...il.com>
+ *
+ * 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 <linux/kthread.h>
+#include <linux/rwlock.h>
+#include <linux/list.h>
+#include <linux/mempool.h>
+#include <linux/highmem.h>
+#include <linux/scatterlist.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <rdma/rw.h>
+
+#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
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