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a9b3043de4
rwlock.h specifically asks to not be included directly. In fact, the proper spinlock.h include isn't needed either, it comes with the huge pile that kthread.h ends up pulling in, so just drop it entirely. Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
2058 lines
54 KiB
C
2058 lines
54 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2017, Microsoft Corporation.
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* Copyright (C) 2018, LG Electronics.
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*
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* Author(s): Long Li <longli@microsoft.com>,
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* Hyunchul Lee <hyc.lee@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*/
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#define SUBMOD_NAME "smb_direct"
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#include <linux/kthread.h>
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#include <linux/list.h>
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#include <linux/mempool.h>
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#include <linux/highmem.h>
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#include <linux/scatterlist.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#include <rdma/rw.h>
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#include "glob.h"
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#include "connection.h"
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#include "smb_common.h"
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#include "smbstatus.h"
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#include "transport_rdma.h"
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#define SMB_DIRECT_PORT 5445
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#define SMB_DIRECT_VERSION_LE cpu_to_le16(0x0100)
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/* SMB_DIRECT negotiation timeout in seconds */
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#define SMB_DIRECT_NEGOTIATE_TIMEOUT 120
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#define SMB_DIRECT_MAX_SEND_SGES 8
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#define SMB_DIRECT_MAX_RECV_SGES 1
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/*
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* Default maximum number of RDMA read/write outstanding on this connection
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* This value is possibly decreased during QP creation on hardware limit
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*/
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#define SMB_DIRECT_CM_INITIATOR_DEPTH 8
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/* Maximum number of retries on data transfer operations */
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#define SMB_DIRECT_CM_RETRY 6
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/* No need to retry on Receiver Not Ready since SMB_DIRECT manages credits */
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#define SMB_DIRECT_CM_RNR_RETRY 0
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/*
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* User configurable initial values per SMB_DIRECT transport connection
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* as defined in [MS-SMBD] 3.1.1.1
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* Those may change after a SMB_DIRECT negotiation
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*/
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/* The local peer's maximum number of credits to grant to the peer */
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static int smb_direct_receive_credit_max = 255;
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/* The remote peer's credit request of local peer */
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static int smb_direct_send_credit_target = 255;
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/* The maximum single message size can be sent to remote peer */
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static int smb_direct_max_send_size = 8192;
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/* The maximum fragmented upper-layer payload receive size supported */
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static int smb_direct_max_fragmented_recv_size = 1024 * 1024;
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/* The maximum single-message size which can be received */
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static int smb_direct_max_receive_size = 8192;
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static int smb_direct_max_read_write_size = 1024 * 1024;
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static int smb_direct_max_outstanding_rw_ops = 8;
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static struct smb_direct_listener {
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struct rdma_cm_id *cm_id;
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} smb_direct_listener;
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static struct workqueue_struct *smb_direct_wq;
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enum smb_direct_status {
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SMB_DIRECT_CS_NEW = 0,
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SMB_DIRECT_CS_CONNECTED,
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SMB_DIRECT_CS_DISCONNECTING,
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SMB_DIRECT_CS_DISCONNECTED,
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};
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struct smb_direct_transport {
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struct ksmbd_transport transport;
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enum smb_direct_status status;
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bool full_packet_received;
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wait_queue_head_t wait_status;
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struct rdma_cm_id *cm_id;
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struct ib_cq *send_cq;
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struct ib_cq *recv_cq;
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struct ib_pd *pd;
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struct ib_qp *qp;
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int max_send_size;
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int max_recv_size;
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int max_fragmented_send_size;
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int max_fragmented_recv_size;
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int max_rdma_rw_size;
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spinlock_t reassembly_queue_lock;
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struct list_head reassembly_queue;
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int reassembly_data_length;
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int reassembly_queue_length;
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int first_entry_offset;
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wait_queue_head_t wait_reassembly_queue;
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spinlock_t receive_credit_lock;
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int recv_credits;
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int count_avail_recvmsg;
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int recv_credit_max;
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int recv_credit_target;
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spinlock_t recvmsg_queue_lock;
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struct list_head recvmsg_queue;
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spinlock_t empty_recvmsg_queue_lock;
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struct list_head empty_recvmsg_queue;
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int send_credit_target;
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atomic_t send_credits;
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spinlock_t lock_new_recv_credits;
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int new_recv_credits;
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atomic_t rw_avail_ops;
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wait_queue_head_t wait_send_credits;
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wait_queue_head_t wait_rw_avail_ops;
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mempool_t *sendmsg_mempool;
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struct kmem_cache *sendmsg_cache;
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mempool_t *recvmsg_mempool;
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struct kmem_cache *recvmsg_cache;
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wait_queue_head_t wait_send_payload_pending;
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atomic_t send_payload_pending;
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wait_queue_head_t wait_send_pending;
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atomic_t send_pending;
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struct delayed_work post_recv_credits_work;
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struct work_struct send_immediate_work;
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struct work_struct disconnect_work;
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bool negotiation_requested;
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};
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#define KSMBD_TRANS(t) ((struct ksmbd_transport *)&((t)->transport))
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enum {
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SMB_DIRECT_MSG_NEGOTIATE_REQ = 0,
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SMB_DIRECT_MSG_DATA_TRANSFER
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};
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static struct ksmbd_transport_ops ksmbd_smb_direct_transport_ops;
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struct smb_direct_send_ctx {
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struct list_head msg_list;
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int wr_cnt;
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bool need_invalidate_rkey;
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unsigned int remote_key;
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};
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struct smb_direct_sendmsg {
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struct smb_direct_transport *transport;
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struct ib_send_wr wr;
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struct list_head list;
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int num_sge;
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struct ib_sge sge[SMB_DIRECT_MAX_SEND_SGES];
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struct ib_cqe cqe;
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u8 packet[];
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};
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struct smb_direct_recvmsg {
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struct smb_direct_transport *transport;
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struct list_head list;
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int type;
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struct ib_sge sge;
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struct ib_cqe cqe;
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bool first_segment;
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u8 packet[];
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};
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struct smb_direct_rdma_rw_msg {
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struct smb_direct_transport *t;
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struct ib_cqe cqe;
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struct completion *completion;
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struct rdma_rw_ctx rw_ctx;
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struct sg_table sgt;
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struct scatterlist sg_list[0];
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};
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static inline int get_buf_page_count(void *buf, int size)
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{
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return DIV_ROUND_UP((uintptr_t)buf + size, PAGE_SIZE) -
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(uintptr_t)buf / PAGE_SIZE;
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}
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static void smb_direct_destroy_pools(struct smb_direct_transport *transport);
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static void smb_direct_post_recv_credits(struct work_struct *work);
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static int smb_direct_post_send_data(struct smb_direct_transport *t,
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struct smb_direct_send_ctx *send_ctx,
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struct kvec *iov, int niov,
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int remaining_data_length);
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static inline struct smb_direct_transport *
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smb_trans_direct_transfort(struct ksmbd_transport *t)
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{
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return container_of(t, struct smb_direct_transport, transport);
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}
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static inline void
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*smb_direct_recvmsg_payload(struct smb_direct_recvmsg *recvmsg)
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{
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return (void *)recvmsg->packet;
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}
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static inline bool is_receive_credit_post_required(int receive_credits,
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int avail_recvmsg_count)
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{
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return receive_credits <= (smb_direct_receive_credit_max >> 3) &&
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avail_recvmsg_count >= (receive_credits >> 2);
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}
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static struct
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smb_direct_recvmsg *get_free_recvmsg(struct smb_direct_transport *t)
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{
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struct smb_direct_recvmsg *recvmsg = NULL;
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spin_lock(&t->recvmsg_queue_lock);
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if (!list_empty(&t->recvmsg_queue)) {
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recvmsg = list_first_entry(&t->recvmsg_queue,
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struct smb_direct_recvmsg,
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list);
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list_del(&recvmsg->list);
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}
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spin_unlock(&t->recvmsg_queue_lock);
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return recvmsg;
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}
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static void put_recvmsg(struct smb_direct_transport *t,
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struct smb_direct_recvmsg *recvmsg)
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{
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ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr,
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recvmsg->sge.length, DMA_FROM_DEVICE);
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spin_lock(&t->recvmsg_queue_lock);
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list_add(&recvmsg->list, &t->recvmsg_queue);
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spin_unlock(&t->recvmsg_queue_lock);
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}
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static struct
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smb_direct_recvmsg *get_empty_recvmsg(struct smb_direct_transport *t)
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{
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struct smb_direct_recvmsg *recvmsg = NULL;
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spin_lock(&t->empty_recvmsg_queue_lock);
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if (!list_empty(&t->empty_recvmsg_queue)) {
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recvmsg = list_first_entry(&t->empty_recvmsg_queue,
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struct smb_direct_recvmsg, list);
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list_del(&recvmsg->list);
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}
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spin_unlock(&t->empty_recvmsg_queue_lock);
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return recvmsg;
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}
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static void put_empty_recvmsg(struct smb_direct_transport *t,
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struct smb_direct_recvmsg *recvmsg)
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{
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ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr,
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recvmsg->sge.length, DMA_FROM_DEVICE);
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spin_lock(&t->empty_recvmsg_queue_lock);
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list_add_tail(&recvmsg->list, &t->empty_recvmsg_queue);
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spin_unlock(&t->empty_recvmsg_queue_lock);
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}
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static void enqueue_reassembly(struct smb_direct_transport *t,
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struct smb_direct_recvmsg *recvmsg,
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int data_length)
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{
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spin_lock(&t->reassembly_queue_lock);
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list_add_tail(&recvmsg->list, &t->reassembly_queue);
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t->reassembly_queue_length++;
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/*
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* Make sure reassembly_data_length is updated after list and
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* reassembly_queue_length are updated. On the dequeue side
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* reassembly_data_length is checked without a lock to determine
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* if reassembly_queue_length and list is up to date
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*/
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virt_wmb();
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t->reassembly_data_length += data_length;
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spin_unlock(&t->reassembly_queue_lock);
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}
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static struct smb_direct_recvmsg *get_first_reassembly(struct smb_direct_transport *t)
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{
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if (!list_empty(&t->reassembly_queue))
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return list_first_entry(&t->reassembly_queue,
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struct smb_direct_recvmsg, list);
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else
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return NULL;
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}
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static void smb_direct_disconnect_rdma_work(struct work_struct *work)
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{
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struct smb_direct_transport *t =
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container_of(work, struct smb_direct_transport,
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disconnect_work);
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if (t->status == SMB_DIRECT_CS_CONNECTED) {
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t->status = SMB_DIRECT_CS_DISCONNECTING;
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rdma_disconnect(t->cm_id);
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}
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}
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static void
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smb_direct_disconnect_rdma_connection(struct smb_direct_transport *t)
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{
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if (t->status == SMB_DIRECT_CS_CONNECTED)
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queue_work(smb_direct_wq, &t->disconnect_work);
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}
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static void smb_direct_send_immediate_work(struct work_struct *work)
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{
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struct smb_direct_transport *t = container_of(work,
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struct smb_direct_transport, send_immediate_work);
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if (t->status != SMB_DIRECT_CS_CONNECTED)
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return;
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smb_direct_post_send_data(t, NULL, NULL, 0, 0);
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}
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static struct smb_direct_transport *alloc_transport(struct rdma_cm_id *cm_id)
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{
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struct smb_direct_transport *t;
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struct ksmbd_conn *conn;
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t = kzalloc(sizeof(*t), GFP_KERNEL);
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if (!t)
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return NULL;
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t->cm_id = cm_id;
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cm_id->context = t;
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t->status = SMB_DIRECT_CS_NEW;
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init_waitqueue_head(&t->wait_status);
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spin_lock_init(&t->reassembly_queue_lock);
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INIT_LIST_HEAD(&t->reassembly_queue);
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t->reassembly_data_length = 0;
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t->reassembly_queue_length = 0;
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init_waitqueue_head(&t->wait_reassembly_queue);
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init_waitqueue_head(&t->wait_send_credits);
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init_waitqueue_head(&t->wait_rw_avail_ops);
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spin_lock_init(&t->receive_credit_lock);
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spin_lock_init(&t->recvmsg_queue_lock);
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INIT_LIST_HEAD(&t->recvmsg_queue);
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spin_lock_init(&t->empty_recvmsg_queue_lock);
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INIT_LIST_HEAD(&t->empty_recvmsg_queue);
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init_waitqueue_head(&t->wait_send_payload_pending);
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atomic_set(&t->send_payload_pending, 0);
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init_waitqueue_head(&t->wait_send_pending);
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atomic_set(&t->send_pending, 0);
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spin_lock_init(&t->lock_new_recv_credits);
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INIT_DELAYED_WORK(&t->post_recv_credits_work,
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smb_direct_post_recv_credits);
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INIT_WORK(&t->send_immediate_work, smb_direct_send_immediate_work);
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INIT_WORK(&t->disconnect_work, smb_direct_disconnect_rdma_work);
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conn = ksmbd_conn_alloc();
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if (!conn)
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goto err;
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conn->transport = KSMBD_TRANS(t);
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KSMBD_TRANS(t)->conn = conn;
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KSMBD_TRANS(t)->ops = &ksmbd_smb_direct_transport_ops;
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return t;
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err:
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kfree(t);
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return NULL;
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}
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static void free_transport(struct smb_direct_transport *t)
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{
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struct smb_direct_recvmsg *recvmsg;
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wake_up_interruptible(&t->wait_send_credits);
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ksmbd_debug(RDMA, "wait for all send posted to IB to finish\n");
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wait_event(t->wait_send_payload_pending,
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atomic_read(&t->send_payload_pending) == 0);
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wait_event(t->wait_send_pending,
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atomic_read(&t->send_pending) == 0);
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cancel_work_sync(&t->disconnect_work);
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cancel_delayed_work_sync(&t->post_recv_credits_work);
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cancel_work_sync(&t->send_immediate_work);
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if (t->qp) {
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ib_drain_qp(t->qp);
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ib_destroy_qp(t->qp);
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}
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ksmbd_debug(RDMA, "drain the reassembly queue\n");
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do {
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spin_lock(&t->reassembly_queue_lock);
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recvmsg = get_first_reassembly(t);
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if (recvmsg) {
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list_del(&recvmsg->list);
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spin_unlock(&t->reassembly_queue_lock);
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put_recvmsg(t, recvmsg);
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} else {
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spin_unlock(&t->reassembly_queue_lock);
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}
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} while (recvmsg);
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t->reassembly_data_length = 0;
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if (t->send_cq)
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ib_free_cq(t->send_cq);
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if (t->recv_cq)
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ib_free_cq(t->recv_cq);
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if (t->pd)
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ib_dealloc_pd(t->pd);
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if (t->cm_id)
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rdma_destroy_id(t->cm_id);
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smb_direct_destroy_pools(t);
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ksmbd_conn_free(KSMBD_TRANS(t)->conn);
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kfree(t);
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}
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static struct smb_direct_sendmsg
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*smb_direct_alloc_sendmsg(struct smb_direct_transport *t)
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{
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struct smb_direct_sendmsg *msg;
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msg = mempool_alloc(t->sendmsg_mempool, GFP_KERNEL);
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if (!msg)
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return ERR_PTR(-ENOMEM);
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msg->transport = t;
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INIT_LIST_HEAD(&msg->list);
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msg->num_sge = 0;
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return msg;
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}
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static void smb_direct_free_sendmsg(struct smb_direct_transport *t,
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struct smb_direct_sendmsg *msg)
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{
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int i;
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if (msg->num_sge > 0) {
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ib_dma_unmap_single(t->cm_id->device,
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msg->sge[0].addr, msg->sge[0].length,
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DMA_TO_DEVICE);
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for (i = 1; i < msg->num_sge; i++)
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ib_dma_unmap_page(t->cm_id->device,
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msg->sge[i].addr, msg->sge[i].length,
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DMA_TO_DEVICE);
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}
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mempool_free(msg, t->sendmsg_mempool);
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}
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|
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static int smb_direct_check_recvmsg(struct smb_direct_recvmsg *recvmsg)
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{
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switch (recvmsg->type) {
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case SMB_DIRECT_MSG_DATA_TRANSFER: {
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struct smb_direct_data_transfer *req =
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(struct smb_direct_data_transfer *)recvmsg->packet;
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struct smb2_hdr *hdr = (struct smb2_hdr *)(recvmsg->packet
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+ le32_to_cpu(req->data_offset) - 4);
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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) {
|
|
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_work(&st->disconnect_work);
|
|
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,
|
|
};
|