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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Namjae Jeon](/assets/img/avatar_default.png)
Steve reported that inactive sessions are terminated after a few seconds. ksmbd terminate when receiving -EAGAIN error from kernel_recvmsg(). -EAGAIN means there is no data available in timeout. So ksmbd should keep connection with unlimited retries instead of terminating inactive sessions. Cc: stable@vger.kernel.org Reported-by: Steve French <stfrench@microsoft.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
2273 lines
59 KiB
C
2273 lines
59 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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#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_IWARP 5445
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#define SMB_DIRECT_PORT_INFINIBAND 445
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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 6
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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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/* Set 445 port to SMB Direct port by default */
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static int smb_direct_port = SMB_DIRECT_PORT_INFINIBAND;
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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 = 1364;
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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 = 1364;
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static int smb_direct_max_read_write_size = SMBD_DEFAULT_IOSIZE;
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static LIST_HEAD(smb_direct_device_list);
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static DEFINE_RWLOCK(smb_direct_device_lock);
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struct smb_direct_device {
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struct ib_device *ib_dev;
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struct list_head list;
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};
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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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int max_rw_credits;
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int pages_per_rw_credit;
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atomic_t rw_credits;
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wait_queue_head_t wait_send_credits;
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wait_queue_head_t wait_rw_credits;
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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_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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int status;
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struct completion *completion;
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struct list_head list;
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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[];
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};
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void init_smbd_max_io_size(unsigned int sz)
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{
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sz = clamp_val(sz, SMBD_MIN_IOSIZE, SMBD_MAX_IOSIZE);
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smb_direct_max_read_write_size = sz;
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}
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unsigned int get_smbd_max_read_write_size(void)
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{
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return smb_direct_max_read_write_size;
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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_credits);
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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_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_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_mr_pool_destroy(t->qp, &t->qp->rdma_mrs);
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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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{
|
|
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));
|
|
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:
|
|
if (wc->byte_len < sizeof(struct smb_direct_negotiate_req)) {
|
|
put_empty_recvmsg(t, recvmsg);
|
|
return;
|
|
}
|
|
t->negotiation_requested = true;
|
|
t->full_packet_received = true;
|
|
t->status = SMB_DIRECT_CS_CONNECTED;
|
|
enqueue_reassembly(t, recvmsg, 0);
|
|
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;
|
|
unsigned int data_length;
|
|
int avail_recvmsg_count, receive_credits;
|
|
|
|
if (wc->byte_len <
|
|
offsetof(struct smb_direct_data_transfer, padding)) {
|
|
put_empty_recvmsg(t, recvmsg);
|
|
return;
|
|
}
|
|
|
|
data_length = le32_to_cpu(data_transfer->data_length);
|
|
if (data_length) {
|
|
if (wc->byte_len < sizeof(struct smb_direct_data_transfer) +
|
|
(u64)data_length) {
|
|
put_empty_recvmsg(t, recvmsg);
|
|
return;
|
|
}
|
|
|
|
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, (int)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, int unused)
|
|
{
|
|
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 (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;
|
|
|
|
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 (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 *total_credits,
|
|
int needed)
|
|
{
|
|
int ret;
|
|
|
|
do {
|
|
if (atomic_sub_return(needed, total_credits) >= 0)
|
|
return 0;
|
|
|
|
atomic_add(needed, total_credits);
|
|
ret = wait_event_interruptible(*waitq,
|
|
atomic_read(total_credits) >= needed ||
|
|
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, 1);
|
|
}
|
|
|
|
static int wait_for_rw_credits(struct smb_direct_transport *t, int credits)
|
|
{
|
|
return wait_for_credits(t, &t->wait_rw_credits, &t->rw_credits, credits);
|
|
}
|
|
|
|
static int calc_rw_credits(struct smb_direct_transport *t,
|
|
char *buf, unsigned int len)
|
|
{
|
|
return DIV_ROUND_UP(get_buf_page_count(buf, len),
|
|
t->pages_per_rw_credit);
|
|
}
|
|
|
|
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 (size <= 0 || 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_pending,
|
|
atomic_read(&st->send_pending) == 0);
|
|
return ret;
|
|
}
|
|
|
|
static void smb_direct_free_rdma_rw_msg(struct smb_direct_transport *t,
|
|
struct smb_direct_rdma_rw_msg *msg,
|
|
enum dma_data_direction dir)
|
|
{
|
|
rdma_rw_ctx_destroy(&msg->rw_ctx, t->qp, t->qp->port,
|
|
msg->sgt.sgl, msg->sgt.nents, dir);
|
|
sg_free_table_chained(&msg->sgt, SG_CHUNK_SIZE);
|
|
kfree(msg);
|
|
}
|
|
|
|
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) {
|
|
msg->status = -EIO;
|
|
pr_err("read/write error. opcode = %d, status = %s(%d)\n",
|
|
wc->opcode, ib_wc_status_msg(wc->status), wc->status);
|
|
if (wc->status != IB_WC_WR_FLUSH_ERR)
|
|
smb_direct_disconnect_rdma_connection(t);
|
|
}
|
|
|
|
complete(msg->completion);
|
|
}
|
|
|
|
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,
|
|
struct smb2_buffer_desc_v1 *desc,
|
|
unsigned int desc_len,
|
|
bool is_read)
|
|
{
|
|
struct smb_direct_rdma_rw_msg *msg, *next_msg;
|
|
int i, ret;
|
|
DECLARE_COMPLETION_ONSTACK(completion);
|
|
struct ib_send_wr *first_wr;
|
|
LIST_HEAD(msg_list);
|
|
char *desc_buf;
|
|
int credits_needed;
|
|
unsigned int desc_buf_len;
|
|
size_t total_length = 0;
|
|
|
|
if (t->status != SMB_DIRECT_CS_CONNECTED)
|
|
return -ENOTCONN;
|
|
|
|
/* calculate needed credits */
|
|
credits_needed = 0;
|
|
desc_buf = buf;
|
|
for (i = 0; i < desc_len / sizeof(*desc); i++) {
|
|
desc_buf_len = le32_to_cpu(desc[i].length);
|
|
|
|
credits_needed += calc_rw_credits(t, desc_buf, desc_buf_len);
|
|
desc_buf += desc_buf_len;
|
|
total_length += desc_buf_len;
|
|
if (desc_buf_len == 0 || total_length > buf_len ||
|
|
total_length > t->max_rdma_rw_size)
|
|
return -EINVAL;
|
|
}
|
|
|
|
ksmbd_debug(RDMA, "RDMA %s, len %#x, needed credits %#x\n",
|
|
is_read ? "read" : "write", buf_len, credits_needed);
|
|
|
|
ret = wait_for_rw_credits(t, credits_needed);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* build rdma_rw_ctx for each descriptor */
|
|
desc_buf = buf;
|
|
for (i = 0; i < desc_len / sizeof(*desc); i++) {
|
|
msg = kzalloc(offsetof(struct smb_direct_rdma_rw_msg, sg_list) +
|
|
sizeof(struct scatterlist) * SG_CHUNK_SIZE, GFP_KERNEL);
|
|
if (!msg) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
desc_buf_len = le32_to_cpu(desc[i].length);
|
|
|
|
msg->t = t;
|
|
msg->cqe.done = is_read ? read_done : write_done;
|
|
msg->completion = &completion;
|
|
|
|
msg->sgt.sgl = &msg->sg_list[0];
|
|
ret = sg_alloc_table_chained(&msg->sgt,
|
|
get_buf_page_count(desc_buf, desc_buf_len),
|
|
msg->sg_list, SG_CHUNK_SIZE);
|
|
if (ret) {
|
|
kfree(msg);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = get_sg_list(desc_buf, desc_buf_len,
|
|
msg->sgt.sgl, msg->sgt.orig_nents);
|
|
if (ret < 0) {
|
|
sg_free_table_chained(&msg->sgt, SG_CHUNK_SIZE);
|
|
kfree(msg);
|
|
goto out;
|
|
}
|
|
|
|
ret = rdma_rw_ctx_init(&msg->rw_ctx, t->qp, t->qp->port,
|
|
msg->sgt.sgl,
|
|
get_buf_page_count(desc_buf, desc_buf_len),
|
|
0,
|
|
le64_to_cpu(desc[i].offset),
|
|
le32_to_cpu(desc[i].token),
|
|
is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
|
|
if (ret < 0) {
|
|
pr_err("failed to init rdma_rw_ctx: %d\n", ret);
|
|
sg_free_table_chained(&msg->sgt, SG_CHUNK_SIZE);
|
|
kfree(msg);
|
|
goto out;
|
|
}
|
|
|
|
list_add_tail(&msg->list, &msg_list);
|
|
desc_buf += desc_buf_len;
|
|
}
|
|
|
|
/* concatenate work requests of rdma_rw_ctxs */
|
|
first_wr = NULL;
|
|
list_for_each_entry_reverse(msg, &msg_list, list) {
|
|
first_wr = rdma_rw_ctx_wrs(&msg->rw_ctx, t->qp, t->qp->port,
|
|
&msg->cqe, first_wr);
|
|
}
|
|
|
|
ret = ib_post_send(t->qp, first_wr, NULL);
|
|
if (ret) {
|
|
pr_err("failed to post send wr for RDMA R/W: %d\n", ret);
|
|
goto out;
|
|
}
|
|
|
|
msg = list_last_entry(&msg_list, struct smb_direct_rdma_rw_msg, list);
|
|
wait_for_completion(&completion);
|
|
ret = msg->status;
|
|
out:
|
|
list_for_each_entry_safe(msg, next_msg, &msg_list, list) {
|
|
list_del(&msg->list);
|
|
smb_direct_free_rdma_rw_msg(t, msg,
|
|
is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
|
|
}
|
|
atomic_add(credits_needed, &t->rw_credits);
|
|
wake_up(&t->wait_rw_credits);
|
|
return ret;
|
|
}
|
|
|
|
static int smb_direct_rdma_write(struct ksmbd_transport *t,
|
|
void *buf, unsigned int buflen,
|
|
struct smb2_buffer_desc_v1 *desc,
|
|
unsigned int desc_len)
|
|
{
|
|
return smb_direct_rdma_xmit(smb_trans_direct_transfort(t), buf, buflen,
|
|
desc, desc_len, false);
|
|
}
|
|
|
|
static int smb_direct_rdma_read(struct ksmbd_transport *t,
|
|
void *buf, unsigned int buflen,
|
|
struct smb2_buffer_desc_v1 *desc,
|
|
unsigned int desc_len)
|
|
{
|
|
return smb_direct_rdma_xmit(smb_trans_direct_transfort(t), buf, buflen,
|
|
desc, desc_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 void smb_direct_shutdown(struct ksmbd_transport *t)
|
|
{
|
|
struct smb_direct_transport *st = smb_trans_direct_transfort(t);
|
|
|
|
ksmbd_debug(RDMA, "smb-direct shutdown cm_id=%p\n", st->cm_id);
|
|
|
|
smb_direct_disconnect_rdma_work(&st->disconnect_work);
|
|
}
|
|
|
|
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: {
|
|
ib_drain_qp(t->qp);
|
|
|
|
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;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int smb_direct_prepare_negotiation(struct smb_direct_transport *t)
|
|
{
|
|
int ret;
|
|
struct smb_direct_recvmsg *recvmsg;
|
|
|
|
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_err;
|
|
}
|
|
|
|
t->negotiation_requested = false;
|
|
ret = smb_direct_accept_client(t);
|
|
if (ret) {
|
|
pr_err("Can't accept client\n");
|
|
goto out_err;
|
|
}
|
|
|
|
smb_direct_post_recv_credits(&t->post_recv_credits_work.work);
|
|
return 0;
|
|
out_err:
|
|
put_recvmsg(t, recvmsg);
|
|
return ret;
|
|
}
|
|
|
|
static unsigned int smb_direct_get_max_fr_pages(struct smb_direct_transport *t)
|
|
{
|
|
return min_t(unsigned int,
|
|
t->cm_id->device->attrs.max_fast_reg_page_list_len,
|
|
256);
|
|
}
|
|
|
|
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_rw_wrs, max_send_wrs;
|
|
unsigned int max_sge_per_wr, wrs_per_credit;
|
|
|
|
/* need 3 more sge. because a SMB_DIRECT header, SMB2 header,
|
|
* SMB2 response could be mapped.
|
|
*/
|
|
t->max_send_size = smb_direct_max_send_size;
|
|
max_send_sges = DIV_ROUND_UP(t->max_send_size, PAGE_SIZE) + 3;
|
|
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;
|
|
}
|
|
|
|
/* Calculate the number of work requests for RDMA R/W.
|
|
* The maximum number of pages which can be registered
|
|
* with one Memory region can be transferred with one
|
|
* R/W credit. And at least 4 work requests for each credit
|
|
* are needed for MR registration, RDMA R/W, local & remote
|
|
* MR invalidation.
|
|
*/
|
|
t->max_rdma_rw_size = smb_direct_max_read_write_size;
|
|
t->pages_per_rw_credit = smb_direct_get_max_fr_pages(t);
|
|
t->max_rw_credits = DIV_ROUND_UP(t->max_rdma_rw_size,
|
|
(t->pages_per_rw_credit - 1) *
|
|
PAGE_SIZE);
|
|
|
|
max_sge_per_wr = min_t(unsigned int, device->attrs.max_send_sge,
|
|
device->attrs.max_sge_rd);
|
|
max_sge_per_wr = max_t(unsigned int, max_sge_per_wr,
|
|
max_send_sges);
|
|
wrs_per_credit = max_t(unsigned int, 4,
|
|
DIV_ROUND_UP(t->pages_per_rw_credit,
|
|
max_sge_per_wr) + 1);
|
|
max_rw_wrs = t->max_rw_credits * wrs_per_credit;
|
|
|
|
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\n",
|
|
smb_direct_send_credit_target);
|
|
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_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_credits, t->max_rw_credits);
|
|
|
|
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 = max_sge_per_wr;
|
|
cap->max_recv_sge = SMB_DIRECT_MAX_RECV_SGES;
|
|
cap->max_inline_data = 0;
|
|
cap->max_rdma_ctxs = t->max_rw_credits;
|
|
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;
|
|
int pages_per_rw;
|
|
|
|
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,
|
|
smb_direct_send_credit_target + cap->max_rdma_ctxs,
|
|
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,
|
|
t->recv_credit_max, 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;
|
|
|
|
pages_per_rw = DIV_ROUND_UP(t->max_rdma_rw_size, PAGE_SIZE) + 1;
|
|
if (pages_per_rw > t->cm_id->device->attrs.max_sgl_rd) {
|
|
ret = ib_mr_pool_init(t->qp, &t->qp->rdma_mrs,
|
|
t->max_rw_credits, IB_MR_TYPE_MEM_REG,
|
|
t->pages_per_rw_credit, 0);
|
|
if (ret) {
|
|
pr_err("failed to init mr pool count %d pages %d\n",
|
|
t->max_rw_credits, t->pages_per_rw_credit);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
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);
|
|
struct smb_direct_recvmsg *recvmsg;
|
|
struct smb_direct_negotiate_req *req;
|
|
int ret;
|
|
|
|
ksmbd_debug(RDMA, "Waiting for SMB_DIRECT negotiate request\n");
|
|
ret = wait_event_interruptible_timeout(st->wait_status,
|
|
st->negotiation_requested ||
|
|
st->status == SMB_DIRECT_CS_DISCONNECTED,
|
|
SMB_DIRECT_NEGOTIATE_TIMEOUT * HZ);
|
|
if (ret <= 0 || st->status == SMB_DIRECT_CS_DISCONNECTED)
|
|
return ret < 0 ? ret : -ETIMEDOUT;
|
|
|
|
recvmsg = get_first_reassembly(st);
|
|
if (!recvmsg)
|
|
return -ECONNABORTED;
|
|
|
|
ret = smb_direct_check_recvmsg(recvmsg);
|
|
if (ret == -ECONNABORTED)
|
|
goto out;
|
|
|
|
req = (struct smb_direct_negotiate_req *)recvmsg->packet;
|
|
st->max_recv_size = min_t(int, st->max_recv_size,
|
|
le32_to_cpu(req->preferred_send_size));
|
|
st->max_send_size = min_t(int, st->max_send_size,
|
|
le32_to_cpu(req->max_receive_size));
|
|
st->max_fragmented_send_size =
|
|
le32_to_cpu(req->max_fragmented_size);
|
|
st->max_fragmented_recv_size =
|
|
(st->recv_credit_max * st->max_recv_size) / 2;
|
|
|
|
ret = smb_direct_send_negotiate_response(st, ret);
|
|
out:
|
|
spin_lock_irq(&st->reassembly_queue_lock);
|
|
st->reassembly_queue_length--;
|
|
list_del(&recvmsg->list);
|
|
spin_unlock_irq(&st->reassembly_queue_lock);
|
|
put_recvmsg(st, recvmsg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int smb_direct_connect(struct smb_direct_transport *st)
|
|
{
|
|
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_prepare_negotiation(st);
|
|
if (ret) {
|
|
pr_err("Can't negotiate: %d\n", ret);
|
|
return ret;
|
|
}
|
|
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;
|
|
int ret;
|
|
|
|
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;
|
|
|
|
ret = smb_direct_connect(t);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
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)) {
|
|
ret = PTR_ERR(KSMBD_TRANS(t)->handler);
|
|
pr_err("Can't start thread\n");
|
|
goto out_err;
|
|
}
|
|
|
|
return 0;
|
|
out_err:
|
|
free_transport(t);
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static int smb_direct_ib_client_add(struct ib_device *ib_dev)
|
|
{
|
|
struct smb_direct_device *smb_dev;
|
|
|
|
/* Set 5445 port if device type is iWARP(No IB) */
|
|
if (ib_dev->node_type != RDMA_NODE_IB_CA)
|
|
smb_direct_port = SMB_DIRECT_PORT_IWARP;
|
|
|
|
if (!ib_dev->ops.get_netdev ||
|
|
!rdma_frwr_is_supported(&ib_dev->attrs))
|
|
return 0;
|
|
|
|
smb_dev = kzalloc(sizeof(*smb_dev), GFP_KERNEL);
|
|
if (!smb_dev)
|
|
return -ENOMEM;
|
|
smb_dev->ib_dev = ib_dev;
|
|
|
|
write_lock(&smb_direct_device_lock);
|
|
list_add(&smb_dev->list, &smb_direct_device_list);
|
|
write_unlock(&smb_direct_device_lock);
|
|
|
|
ksmbd_debug(RDMA, "ib device added: name %s\n", ib_dev->name);
|
|
return 0;
|
|
}
|
|
|
|
static void smb_direct_ib_client_remove(struct ib_device *ib_dev,
|
|
void *client_data)
|
|
{
|
|
struct smb_direct_device *smb_dev, *tmp;
|
|
|
|
write_lock(&smb_direct_device_lock);
|
|
list_for_each_entry_safe(smb_dev, tmp, &smb_direct_device_list, list) {
|
|
if (smb_dev->ib_dev == ib_dev) {
|
|
list_del(&smb_dev->list);
|
|
kfree(smb_dev);
|
|
break;
|
|
}
|
|
}
|
|
write_unlock(&smb_direct_device_lock);
|
|
}
|
|
|
|
static struct ib_client smb_direct_ib_client = {
|
|
.name = "ksmbd_smb_direct_ib",
|
|
.add = smb_direct_ib_client_add,
|
|
.remove = smb_direct_ib_client_remove,
|
|
};
|
|
|
|
int ksmbd_rdma_init(void)
|
|
{
|
|
int ret;
|
|
|
|
smb_direct_listener.cm_id = NULL;
|
|
|
|
ret = ib_register_client(&smb_direct_ib_client);
|
|
if (ret) {
|
|
pr_err("failed to ib_register_client\n");
|
|
return ret;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
void ksmbd_rdma_destroy(void)
|
|
{
|
|
if (!smb_direct_listener.cm_id)
|
|
return;
|
|
|
|
ib_unregister_client(&smb_direct_ib_client);
|
|
rdma_destroy_id(smb_direct_listener.cm_id);
|
|
|
|
smb_direct_listener.cm_id = NULL;
|
|
|
|
if (smb_direct_wq) {
|
|
destroy_workqueue(smb_direct_wq);
|
|
smb_direct_wq = NULL;
|
|
}
|
|
}
|
|
|
|
bool ksmbd_rdma_capable_netdev(struct net_device *netdev)
|
|
{
|
|
struct smb_direct_device *smb_dev;
|
|
int i;
|
|
bool rdma_capable = false;
|
|
|
|
read_lock(&smb_direct_device_lock);
|
|
list_for_each_entry(smb_dev, &smb_direct_device_list, list) {
|
|
for (i = 0; i < smb_dev->ib_dev->phys_port_cnt; i++) {
|
|
struct net_device *ndev;
|
|
|
|
ndev = smb_dev->ib_dev->ops.get_netdev(smb_dev->ib_dev,
|
|
i + 1);
|
|
if (!ndev)
|
|
continue;
|
|
|
|
if (ndev == netdev) {
|
|
dev_put(ndev);
|
|
rdma_capable = true;
|
|
goto out;
|
|
}
|
|
dev_put(ndev);
|
|
}
|
|
}
|
|
out:
|
|
read_unlock(&smb_direct_device_lock);
|
|
|
|
if (rdma_capable == false) {
|
|
struct ib_device *ibdev;
|
|
|
|
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,
|
|
.shutdown = smb_direct_shutdown,
|
|
.writev = smb_direct_writev,
|
|
.read = smb_direct_read,
|
|
.rdma_read = smb_direct_rdma_read,
|
|
.rdma_write = smb_direct_rdma_write,
|
|
};
|