diff options
| -rw-r--r-- | fs/cifs/Makefile | 2 | ||||
| -rw-r--r-- | fs/cifs/smbdirect.c | 1571 | ||||
| -rw-r--r-- | fs/cifs/smbdirect.h | 230 |
3 files changed, 1803 insertions, 0 deletions
diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile index 7134f182720b..7e4a1e2f0696 100644 --- a/fs/cifs/Makefile +++ b/fs/cifs/Makefile @@ -19,3 +19,5 @@ cifs-$(CONFIG_CIFS_UPCALL) += cifs_spnego.o cifs-$(CONFIG_CIFS_DFS_UPCALL) += dns_resolve.o cifs_dfs_ref.o cifs-$(CONFIG_CIFS_FSCACHE) += fscache.o cache.o + +cifs-$(CONFIG_CIFS_SMB_DIRECT) += smbdirect.o diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c index d3c16f872fe1..2ecd5c19d313 100644 --- a/fs/cifs/smbdirect.c +++ b/fs/cifs/smbdirect.c @@ -13,7 +13,33 @@ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU General Public License for more details. */ +#include <linux/module.h> #include "smbdirect.h" +#include "cifs_debug.h" + +static struct smbd_response *get_empty_queue_buffer( + struct smbd_connection *info); +static struct smbd_response *get_receive_buffer( + struct smbd_connection *info); +static void put_receive_buffer( + struct smbd_connection *info, + struct smbd_response *response); +static int allocate_receive_buffers(struct smbd_connection *info, int num_buf); +static void destroy_receive_buffers(struct smbd_connection *info); + +static void put_empty_packet( + struct smbd_connection *info, struct smbd_response *response); +static void enqueue_reassembly( + struct smbd_connection *info, + struct smbd_response *response, int data_length); +static struct smbd_response *_get_first_reassembly( + struct smbd_connection *info); + +static int smbd_post_recv( + struct smbd_connection *info, + struct smbd_response *response); + +static int smbd_post_send_empty(struct smbd_connection *info); /* SMBD version number */ #define SMBD_V1 0x0100 @@ -75,3 +101,1548 @@ int smbd_max_frmr_depth = 2048; /* If payload is less than this byte, use RDMA send/recv not read/write */ int rdma_readwrite_threshold = 4096; + +/* Transport logging functions + * Logging are defined as classes. They can be OR'ed to define the actual + * logging level via module parameter smbd_logging_class + * e.g. cifs.smbd_logging_class=0xa0 will log all log_rdma_recv() and + * log_rdma_event() + */ +#define LOG_OUTGOING 0x1 +#define LOG_INCOMING 0x2 +#define LOG_READ 0x4 +#define LOG_WRITE 0x8 +#define LOG_RDMA_SEND 0x10 +#define LOG_RDMA_RECV 0x20 +#define LOG_KEEP_ALIVE 0x40 +#define LOG_RDMA_EVENT 0x80 +#define LOG_RDMA_MR 0x100 +static unsigned int smbd_logging_class; +module_param(smbd_logging_class, uint, 0644); +MODULE_PARM_DESC(smbd_logging_class, + "Logging class for SMBD transport 0x0 to 0x100"); + +#define ERR 0x0 +#define INFO 0x1 +static unsigned int smbd_logging_level = ERR; +module_param(smbd_logging_level, uint, 0644); +MODULE_PARM_DESC(smbd_logging_level, + "Logging level for SMBD transport, 0 (default): error, 1: info"); + +#define log_rdma(level, class, fmt, args...) \ +do { \ + if (level <= smbd_logging_level || class & smbd_logging_class) \ + cifs_dbg(VFS, "%s:%d " fmt, __func__, __LINE__, ##args);\ +} while (0) + +#define log_outgoing(level, fmt, args...) \ + log_rdma(level, LOG_OUTGOING, fmt, ##args) +#define log_incoming(level, fmt, args...) \ + log_rdma(level, LOG_INCOMING, fmt, ##args) +#define log_read(level, fmt, args...) log_rdma(level, LOG_READ, fmt, ##args) +#define log_write(level, fmt, args...) log_rdma(level, LOG_WRITE, fmt, ##args) +#define log_rdma_send(level, fmt, args...) \ + log_rdma(level, LOG_RDMA_SEND, fmt, ##args) +#define log_rdma_recv(level, fmt, args...) \ + log_rdma(level, LOG_RDMA_RECV, fmt, ##args) +#define log_keep_alive(level, fmt, args...) \ + log_rdma(level, LOG_KEEP_ALIVE, fmt, ##args) +#define log_rdma_event(level, fmt, args...) \ + log_rdma(level, LOG_RDMA_EVENT, fmt, ##args) +#define log_rdma_mr(level, fmt, args...) \ + log_rdma(level, LOG_RDMA_MR, fmt, ##args) + +/* + * Destroy the transport and related RDMA and memory resources + * Need to go through all the pending counters and make sure on one is using + * the transport while it is destroyed + */ +static void smbd_destroy_rdma_work(struct work_struct *work) +{ + struct smbd_response *response; + struct smbd_connection *info = + container_of(work, struct smbd_connection, destroy_work); + unsigned long flags; + + log_rdma_event(INFO, "destroying qp\n"); + ib_drain_qp(info->id->qp); + rdma_destroy_qp(info->id); + + /* Unblock all I/O waiting on the send queue */ + wake_up_interruptible_all(&info->wait_send_queue); + + log_rdma_event(INFO, "cancelling idle timer\n"); + cancel_delayed_work_sync(&info->idle_timer_work); + log_rdma_event(INFO, "cancelling send immediate work\n"); + cancel_delayed_work_sync(&info->send_immediate_work); + + log_rdma_event(INFO, "wait for all recv to finish\n"); + wake_up_interruptible(&info->wait_reassembly_queue); + + log_rdma_event(INFO, "wait for all send posted to IB to finish\n"); + wait_event(info->wait_send_pending, + atomic_read(&info->send_pending) == 0); + wait_event(info->wait_send_payload_pending, + atomic_read(&info->send_payload_pending) == 0); + + /* It's not posssible for upper layer to get to reassembly */ + log_rdma_event(INFO, "drain the reassembly queue\n"); + do { + spin_lock_irqsave(&info->reassembly_queue_lock, flags); + response = _get_first_reassembly(info); + if (response) { + list_del(&response->list); + spin_unlock_irqrestore( + &info->reassembly_queue_lock, flags); + put_receive_buffer(info, response); + } + } while (response); + spin_unlock_irqrestore(&info->reassembly_queue_lock, flags); + info->reassembly_data_length = 0; + + log_rdma_event(INFO, "free receive buffers\n"); + wait_event(info->wait_receive_queues, + info->count_receive_queue + info->count_empty_packet_queue + == info->receive_credit_max); + destroy_receive_buffers(info); + + ib_free_cq(info->send_cq); + ib_free_cq(info->recv_cq); + ib_dealloc_pd(info->pd); + rdma_destroy_id(info->id); + + /* free mempools */ + mempool_destroy(info->request_mempool); + kmem_cache_destroy(info->request_cache); + + mempool_destroy(info->response_mempool); + kmem_cache_destroy(info->response_cache); + + info->transport_status = SMBD_DESTROYED; + wake_up_all(&info->wait_destroy); +} + +static int smbd_process_disconnected(struct smbd_connection *info) +{ + schedule_work(&info->destroy_work); + return 0; +} + +static void smbd_disconnect_rdma_work(struct work_struct *work) +{ + struct smbd_connection *info = + container_of(work, struct smbd_connection, disconnect_work); + + if (info->transport_status == SMBD_CONNECTED) { + info->transport_status = SMBD_DISCONNECTING; + rdma_disconnect(info->id); + } +} + +static void smbd_disconnect_rdma_connection(struct smbd_connection *info) +{ + queue_work(info->workqueue, &info->disconnect_work); +} + +/* Upcall from RDMA CM */ +static int smbd_conn_upcall( + struct rdma_cm_id *id, struct rdma_cm_event *event) +{ + struct smbd_connection *info = id->context; + + log_rdma_event(INFO, "event=%d status=%d\n", + event->event, event->status); + + switch (event->event) { + case RDMA_CM_EVENT_ADDR_RESOLVED: + case RDMA_CM_EVENT_ROUTE_RESOLVED: + info->ri_rc = 0; + complete(&info->ri_done); + break; + + case RDMA_CM_EVENT_ADDR_ERROR: + info->ri_rc = -EHOSTUNREACH; + complete(&info->ri_done); + break; + + case RDMA_CM_EVENT_ROUTE_ERROR: + info->ri_rc = -ENETUNREACH; + complete(&info->ri_done); + break; + + case RDMA_CM_EVENT_ESTABLISHED: + log_rdma_event(INFO, "connected event=%d\n", event->event); + info->transport_status = SMBD_CONNECTED; + wake_up_interruptible(&info->conn_wait); + break; + + case RDMA_CM_EVENT_CONNECT_ERROR: + case RDMA_CM_EVENT_UNREACHABLE: + case RDMA_CM_EVENT_REJECTED: + log_rdma_event(INFO, "connecting failed event=%d\n", event->event); + info->transport_status = SMBD_DISCONNECTED; + wake_up_interruptible(&info->conn_wait); + break; + + case RDMA_CM_EVENT_DEVICE_REMOVAL: + case RDMA_CM_EVENT_DISCONNECTED: + /* This happenes when we fail the negotiation */ + if (info->transport_status == SMBD_NEGOTIATE_FAILED) { + info->transport_status = SMBD_DISCONNECTED; + wake_up(&info->conn_wait); + break; + } + + info->transport_status = SMBD_DISCONNECTED; + smbd_process_disconnected(info); + break; + + default: + break; + } + + return 0; +} + +/* Upcall from RDMA QP */ +static void +smbd_qp_async_error_upcall(struct ib_event *event, void *context) +{ + struct smbd_connection *info = context; + + log_rdma_event(ERR, "%s on device %s info %p\n", + ib_event_msg(event->event), event->device->name, info); + + switch (event->event) { + case IB_EVENT_CQ_ERR: + case IB_EVENT_QP_FATAL: + smbd_disconnect_rdma_connection(info); + + default: + break; + } +} + +static inline void *smbd_request_payload(struct smbd_request *request) +{ + return (void *)request->packet; +} + +static inline void *smbd_response_payload(struct smbd_response *response) +{ + return (void *)response->packet; +} + +/* Called when a RDMA send is done */ +static void send_done(struct ib_cq *cq, struct ib_wc *wc) +{ + int i; + struct smbd_request *request = + container_of(wc->wr_cqe, struct smbd_request, cqe); + + log_rdma_send(INFO, "smbd_request %p completed wc->status=%d\n", + request, wc->status); + + if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_SEND) { + log_rdma_send(ERR, "wc->status=%d wc->opcode=%d\n", + wc->status, wc->opcode); + smbd_disconnect_rdma_connection(request->info); + } + + for (i = 0; i < request->num_sge; i++) + ib_dma_unmap_single(request->info->id->device, + request->sge[i].addr, + request->sge[i].length, + DMA_TO_DEVICE); + + if (request->has_payload) { + if (atomic_dec_and_test(&request->info->send_payload_pending)) + wake_up(&request->info->wait_send_payload_pending); + } else { + if (atomic_dec_and_test(&request->info->send_pending)) + wake_up(&request->info->wait_send_pending); + } + + mempool_free(request, request->info->request_mempool); +} + +static void dump_smbd_negotiate_resp(struct smbd_negotiate_resp *resp) +{ + log_rdma_event(INFO, "resp message min_version %u max_version %u " + "negotiated_version %u credits_requested %u " + "credits_granted %u status %u max_readwrite_size %u " + "preferred_send_size %u max_receive_size %u " + "max_fragmented_size %u\n", + resp->min_version, resp->max_version, resp->negotiated_version, + resp->credits_requested, resp->credits_granted, resp->status, + resp->max_readwrite_size, resp->preferred_send_size, + resp->max_receive_size, resp->max_fragmented_size); +} + +/* + * Process a negotiation response message, according to [MS-SMBD]3.1.5.7 + * response, packet_length: the negotiation response message + * return value: true if negotiation is a success, false if failed + */ +static bool process_negotiation_response( + struct smbd_response *response, int packet_length) +{ + struct smbd_connection *info = response->info; + struct smbd_negotiate_resp *packet = smbd_response_payload(response); + + if (packet_length < sizeof(struct smbd_negotiate_resp)) { + log_rdma_event(ERR, + "error: packet_length=%d\n", packet_length); + return false; + } + + if (le16_to_cpu(packet->negotiated_version) != SMBD_V1) { + log_rdma_event(ERR, "error: negotiated_version=%x\n", + le16_to_cpu(packet->negotiated_version)); + return false; + } + info->protocol = le16_to_cpu(packet->negotiated_version); + + if (packet->credits_requested == 0) { + log_rdma_event(ERR, "error: credits_requested==0\n"); + return false; + } + info->receive_credit_target = le16_to_cpu(packet->credits_requested); + + if (packet->credits_granted == 0) { + log_rdma_event(ERR, "error: credits_granted==0\n"); + return false; + } + atomic_set(&info->send_credits, le16_to_cpu(packet->credits_granted)); + + atomic_set(&info->receive_credits, 0); + + if (le32_to_cpu(packet->preferred_send_size) > info->max_receive_size) { + log_rdma_event(ERR, "error: preferred_send_size=%d\n", + le32_to_cpu(packet->preferred_send_size)); + return false; + } + info->max_receive_size = le32_to_cpu(packet->preferred_send_size); + + if (le32_to_cpu(packet->max_receive_size) < SMBD_MIN_RECEIVE_SIZE) { + log_rdma_event(ERR, "error: max_receive_size=%d\n", + le32_to_cpu(packet->max_receive_size)); + return false; + } + info->max_send_size = min_t(int, info->max_send_size, + le32_to_cpu(packet->max_receive_size)); + + if (le32_to_cpu(packet->max_fragmented_size) < + SMBD_MIN_FRAGMENTED_SIZE) { + log_rdma_event(ERR, "error: max_fragmented_size=%d\n", + le32_to_cpu(packet->max_fragmented_size)); + return false; + } + info->max_fragmented_send_size = + le32_to_cpu(packet->max_fragmented_size); + + return true; +} + +/* + * Check and schedule to send an immediate packet + * This is used to extend credtis to remote peer to keep the transport busy + */ +static void check_and_send_immediate(struct smbd_connection *info) +{ + if (info->transport_status != SMBD_CONNECTED) + return; + + info->send_immediate = true; + + /* + * Promptly send a packet if our peer is running low on receive + * credits + */ + if (atomic_read(&info->receive_credits) < + info->receive_credit_target - 1) + queue_delayed_work( + info->workqueue, &info->send_immediate_work, 0); +} + +static void smbd_post_send_credits(struct work_struct *work) +{ + int ret = 0; + int use_receive_queue = 1; + int rc; + struct smbd_response *response; + struct smbd_connection *info = + container_of(work, struct smbd_connection, + post_send_credits_work); + + if (info->transport_status != SMBD_CONNECTED) { + wake_up(&info->wait_receive_queues); + return; + } + + if (info->receive_credit_target > + atomic_read(&info->receive_credits)) { + while (true) { + if (use_receive_queue) + response = get_receive_buffer(info); + else + response = get_empty_queue_buffer(info); + if (!response) { + /* now switch to emtpy packet queue */ + if (use_receive_queue) { + use_receive_queue = 0; + continue; + } else + break; + } + + response->type = SMBD_TRANSFER_DATA; + response->first_segment = false; + rc = smbd_post_recv(info, response); + if (rc) { + log_rdma_recv(ERR, + "post_recv failed rc=%d\n", rc); + put_receive_buffer(info, response); + break; + } + + ret++; + } + } + + spin_lock(&info->lock_new_credits_offered); + info->new_credits_offered += ret; + spin_unlock(&info->lock_new_credits_offered); + + atomic_add(ret, &info->receive_credits); + + /* Check if we can post new receive and grant credits to peer */ + check_and_send_immediate(info); +} + +static void smbd_recv_done_work(struct work_struct *work) +{ + struct smbd_connection *info = + container_of(work, struct smbd_connection, recv_done_work); + + /* + * We may have new send credits granted from remote peer + * If any sender is blcoked on lack of credets, unblock it + */ + if (atomic_read(&info->send_credits)) + wake_up_interruptible(&info->wait_send_queue); + + /* + * Check if we need to send something to remote peer to + * grant more credits or respond to KEEP_ALIVE packet + */ + check_and_send_immediate(info); +} + +/* Called from softirq, when recv is done */ +static void recv_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct smbd_data_transfer *data_transfer; + struct smbd_response *response = + container_of(wc->wr_cqe, struct smbd_response, cqe); + struct smbd_connection *info = response->info; + int data_length = 0; + + log_rdma_recv(INFO, "response=%p type=%d wc status=%d wc opcode %d " + "byte_len=%d pkey_index=%x\n", + response, response->type, wc->status, wc->opcode, + wc->byte_len, wc->pkey_index); + + if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_RECV) { + log_rdma_recv(INFO, "wc->status=%d opcode=%d\n", + wc->status, wc->opcode); + smbd_disconnect_rdma_connection(info); + goto error; + } + + ib_dma_sync_single_for_cpu( + wc->qp->device, + response->sge.addr, + response->sge.length, + DMA_FROM_DEVICE); + + switch (response->type) { + /* SMBD negotiation response */ + case SMBD_NEGOTIATE_RESP: + dump_smbd_negotiate_resp(smbd_response_payload(response)); + info->full_packet_received = true; + info->negotiate_done = + process_negotiation_response(response, wc->byte_len); + complete(&info->negotiate_completion); + break; + + /* SMBD data transfer packet */ + case SMBD_TRANSFER_DATA: + data_transfer = smbd_response_payload(response); + data_length = le32_to_cpu(data_transfer->data_length); + + /* + * If this is a packet with data playload place the data in + * reassembly queue and wake up the reading thread + */ + if (data_length) { + if (info->full_packet_received) + response->first_segment = true; + + if (le32_to_cpu(data_transfer->remaining_data_length)) + info->full_packet_received = false; + else + info->full_packet_received = true; + + enqueue_reassembly( + info, + response, + data_length); + } else + put_empty_packet(info, response); + + if (data_length) + wake_up_interruptible(&info->wait_reassembly_queue); + + atomic_dec(&info->receive_credits); + info->receive_credit_target = + le16_to_cpu(data_transfer->credits_requested); + atomic_add(le16_to_cpu(data_transfer->credits_granted), + &info->send_credits); + + log_incoming(INFO, "data flags %d data_offset %d " + "data_length %d remaining_data_length %d\n", + le16_to_cpu(data_transfer->flags), + le32_to_cpu(data_transfer->data_offset), + le32_to_cpu(data_transfer->data_length), + le32_to_cpu(data_transfer->remaining_data_length)); + + /* Send a KEEP_ALIVE response right away if requested */ + info->keep_alive_requested = KEEP_ALIVE_NONE; + if (le16_to_cpu(data_transfer->flags) & + SMB_DIRECT_RESPONSE_REQUESTED) { + info->keep_alive_requested = KEEP_ALIVE_PENDING; + } + + queue_work(info->workqueue, &info->recv_done_work); + return; + + default: + log_rdma_recv(ERR, + "unexpected response type=%d\n", response->type); + } + +error: + put_receive_buffer(info, response); +} + +static struct rdma_cm_id *smbd_create_id( + struct smbd_connection *info, + struct sockaddr *dstaddr, int port) +{ + struct rdma_cm_id *id; + int rc; + __be16 *sport; + + id = rdma_create_id(&init_net, smbd_conn_upcall, info, + RDMA_PS_TCP, IB_QPT_RC); + if (IS_ERR(id)) { + rc = PTR_ERR(id); + log_rdma_event(ERR, "rdma_create_id() failed %i\n", rc); + return id; + } + + if (dstaddr->sa_family == AF_INET6) + sport = &((struct sockaddr_in6 *)dstaddr)->sin6_port; + else + sport = &((struct sockaddr_in *)dstaddr)->sin_port; + + *sport = htons(port); + + init_completion(&info->ri_done); + info->ri_rc = -ETIMEDOUT; + + rc = rdma_resolve_addr(id, NULL, (struct sockaddr *)dstaddr, + RDMA_RESOLVE_TIMEOUT); + if (rc) { + log_rdma_event(ERR, "rdma_resolve_addr() failed %i\n", rc); + goto out; + } + wait_for_completion_interruptible_timeout( + &info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT)); + rc = info->ri_rc; + if (rc) { + log_rdma_event(ERR, "rdma_resolve_addr() completed %i\n", rc); + goto out; + } + + info->ri_rc = -ETIMEDOUT; + rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); + if (rc) { + log_rdma_event(ERR, "rdma_resolve_route() failed %i\n", rc); + goto out; + } + wait_for_completion_interruptible_timeout( + &info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT)); + rc = info->ri_rc; + if (rc) { + log_rdma_event(ERR, "rdma_resolve_route() completed %i\n", rc); + goto out; + } + + return id; + +out: + rdma_destroy_id(id); + return ERR_PTR(rc); +} + +/* + * Test if FRWR (Fast Registration Work Requests) is supported on the device + * This implementation requries FRWR on RDMA read/write + * return value: true if it is supported + */ +static bool 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 smbd_ia_open( + struct smbd_connection *info, + struct sockaddr *dstaddr, int port) +{ + int rc; + + info->id = smbd_create_id(info, dstaddr, port); + if (IS_ERR(info->id)) { + rc = PTR_ERR(info->id); + goto out1; + } + + if (!frwr_is_supported(&info->id->device->attrs)) { + log_rdma_event(ERR, + "Fast Registration Work Requests " + "(FRWR) is not supported\n"); + log_rdma_event(ERR, + "Device capability flags = %llx " + "max_fast_reg_page_list_len = %u\n", + info->id->device->attrs.device_cap_flags, + info->id->device->attrs.max_fast_reg_page_list_len); + rc = -EPROTONOSUPPORT; + goto out2; + } + + info->pd = ib_alloc_pd(info->id->device, 0); + if (IS_ERR(info->pd)) { + rc = PTR_ERR(info->pd); + log_rdma_event(ERR, "ib_alloc_pd() returned %d\n", rc); + goto out2; + } + + return 0; + +out2: + rdma_destroy_id(info->id); + info->id = NULL; + +out1: + return rc; +} + +/* + * Send a negotiation request message to the peer + * The negotiation procedure is in [MS-SMBD] 3.1.5.2 and 3.1.5.3 + * After negotiation, the transport is connected and ready for + * carrying upper layer SMB payload + */ +static int smbd_post_send_negotiate_req(struct smbd_connection *info) +{ + struct ib_send_wr send_wr, *send_wr_fail; + int rc = -ENOMEM; + struct smbd_request *request; + struct smbd_negotiate_req *packet; + + request = mempool_alloc(info->request_mempool, GFP_KERNEL); + if (!request) + return rc; + + request->info = info; + + packet = smbd_request_payload(request); + packet->min_version = cpu_to_le16(SMBD_V1); + packet->max_version = cpu_to_le16(SMBD_V1); + packet->reserved = 0; + packet->credits_requested = cpu_to_le16(info->send_credit_target); + packet->preferred_send_size = cpu_to_le32(info->max_send_size); + packet->max_receive_size = cpu_to_le32(info->max_receive_size); + packet->max_fragmented_size = + cpu_to_le32(info->max_fragmented_recv_size); + + request->num_sge = 1; + request->sge[0].addr = ib_dma_map_single( + info->id->device, (void *)packet, + sizeof(*packet), DMA_TO_DEVICE); + if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) { + rc = -EIO; + goto dma_mapping_failed; + } + + request->sge[0].length = sizeof(*packet); + request->sge[0].lkey = info->pd->local_dma_lkey; + + ib_dma_sync_single_for_device( + info->id->device, request->sge[0].addr, + request->sge[0].length, DMA_TO_DEVICE); + + request->cqe.done = send_done; + + send_wr.next = NULL; + send_wr.wr_cqe = &request->cqe; + send_wr.sg_list = request->sge; + send_wr.num_sge = request->num_sge; + send_wr.opcode = IB_WR_SEND; + send_wr.send_flags = IB_SEND_SIGNALED; + + log_rdma_send(INFO, "sge addr=%llx length=%x lkey=%x\n", + request->sge[0].addr, + request->sge[0].length, request->sge[0].lkey); + + request->has_payload = false; + atomic_inc(&info->send_pending); + rc = ib_post_send(info->id->qp, &send_wr, &send_wr_fail); + if (!rc) + return 0; + + /* if we reach here, post send failed */ + log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc); + atomic_dec(&info->send_pending); + ib_dma_unmap_single(info->id->device, request->sge[0].addr, + request->sge[0].length, DMA_TO_DEVICE); + +dma_mapping_failed: + mempool_free(request, info->request_mempool); + return rc; +} + +/* + * Extend the credits to remote peer + * This implements [MS-SMBD] 3.1.5.9 + * The idea is that we should extend credits to remote peer as quickly as + * it's allowed, to maintain data flow. We allocate as much receive + * buffer as possible, and extend the receive credits to remote peer + * return value: the new credtis being granted. + */ +static int manage_credits_prior_sending(struct smbd_connection *info) +{ + int new_credits; + + spin_lock(&info->lock_new_credits_offered); + new_credits = info->new_credits_offered; + info->new_credits_offered = 0; + spin_unlock(&info->lock_new_credits_offered); + + return new_credits; +} + +/* + * Check if we need to send a KEEP_ALIVE message + * The idle connection timer triggers a KEEP_ALIVE message when expires + * SMB_DIRECT_RESPONSE_REQUESTED is set in the message flag to have peer send + * back a response. + * return value: + * 1 if SMB_DIRECT_RESPONSE_REQUESTED needs to be set + * 0: otherwise + */ +static int manage_keep_alive_before_sending(struct smbd_connection *info) +{ + if (info->keep_alive_requested == KEEP_ALIVE_PENDING) { + info->keep_alive_requested = KEEP_ALIVE_SENT; + return 1; + } + return 0; +} + +/* + * Build and prepare the SMBD packet header + * This function waits for avaialbe send credits and build a SMBD packet + * header. The caller then optional append payload to the packet after + * the header + * intput values + * size: the size of the payload + * remaining_data_length: remaining data to send if this is part of a + * fragmented packet + * output values + * request_out: the request allocated from this function + * return values: 0 on success, otherwise actual error code returned + */ +static int smbd_create_header(struct smbd_connection *info, + int size, int remaining_data_length, + struct smbd_request **request_out) +{ + struct smbd_request *request; + struct smbd_data_transfer *packet; + int header_length; + int rc; + + /* Wait for send credits. A SMBD packet needs one credit */ + rc = wait_event_interruptible(info->wait_send_queue, + atomic_read(&info->send_credits) > 0 || + info->transport_status != SMBD_CONNECTED); + if (rc) + return rc; + + if (info->transport_status != SMBD_CONNECTED) { + log_outgoing(ERR, "disconnected not sending\n"); + return -ENOENT; + } + atomic_dec(&info->send_credits); + + request = mempool_alloc(info->request_mempool, GFP_KERNEL); + if (!request) { + rc = -ENOMEM; + goto err; + } + + request->info = info; + + /* Fill in the packet header */ + packet = smbd_request_payload(request); + packet->credits_requested = cpu_to_le16(info->send_credit_target); + packet->credits_granted = + cpu_to_le16(manage_credits_prior_sending(info)); + info->send_immediate = false; + + packet->flags = 0; + if (manage_keep_alive_before_sending(info)) + packet->flags |= cpu_to_le16(SMB_DIRECT_RESPONSE_REQUESTED); + + 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; + + log_outgoing(INFO, "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 smbd_data_transfer); + /* If this is a packet without payload, don't send padding */ + if (!size) + header_length = offsetof(struct smbd_data_transfer, padding); + + request->num_sge = 1; + request->sge[0].addr = ib_dma_map_single(info->id->device, + (void *)packet, + header_length, + DMA_BIDIRECTIONAL); + if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) { + mempool_free(request, info->request_mempool); + rc = -EIO; + goto err; + } + + request->sge[0].length = header_length; + request->sge[0].lkey = info->pd->local_dma_lkey; + + *request_out = request; + return 0; + +err: + atomic_inc(&info->send_credits); + return rc; +} + +static void smbd_destroy_header(struct smbd_connection *info, + struct smbd_request *request) +{ + + ib_dma_unmap_single(info->id->device, + request->sge[0].addr, + request->sge[0].length, + DMA_TO_DEVICE); + mempool_free(request, info->request_mempool); + atomic_inc(&info->send_credits); +} + +/* Post the send request */ +static int smbd_post_send(struct smbd_connection *info, + struct smbd_request *request, bool has_payload) +{ + struct ib_send_wr send_wr, *send_wr_fail; + int rc, i; + + for (i = 0; i < request->num_sge; i++) { + log_rdma_send(INFO, + "rdma_request sge[%d] addr=%llu legnth=%u\n", + i, request->sge[0].addr, request->sge[0].length); + ib_dma_sync_single_for_device( + info->id->device, + request->sge[i].addr, + request->sge[i].length, + DMA_TO_DEVICE); + } + + request->cqe.done = send_done; + + send_wr.next = NULL; + send_wr.wr_cqe = &request->cqe; + send_wr.sg_list = request->sge; + send_wr.num_sge = request->num_sge; + send_wr.opcode = IB_WR_SEND; + send_wr.send_flags = IB_SEND_SIGNALED; + + if (has_payload) { + request->has_payload = true; + atomic_inc(&info->send_payload_pending); + } else { + request->has_payload = false; + atomic_inc(&info->send_pending); + } + + rc = ib_post_send(info->id->qp, &send_wr, &send_wr_fail); + if (rc) { + log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc); + if (has_payload) { + if (atomic_dec_and_test(&info->send_payload_pending)) + wake_up(&info->wait_send_payload_pending); + } else { + if (atomic_dec_and_test(&info->send_pending)) + wake_up(&info->wait_send_pending); + } + } else + /* Reset timer for idle connection after packet is sent */ + mod_delayed_work(info->workqueue, &info->idle_timer_work, + info->keep_alive_interval*HZ); + + return rc; +} + +static int smbd_post_send_sgl(struct smbd_connection *info, + struct scatterlist *sgl, int data_length, int remaining_data_length) +{ + int num_sgs; + int i, rc; + struct smbd_request *request; + struct scatterlist *sg; + + rc = smbd_create_header( + info, data_length, remaining_data_length, &request); + if (rc) + return rc; + + num_sgs = sgl ? sg_nents(sgl) : 0; + for_each_sg(sgl, sg, num_sgs, i) { + request->sge[i+1].addr = + ib_dma_map_page(info->id->device, sg_page(sg), + sg->offset, sg->length, DMA_BIDIRECTIONAL); + if (ib_dma_mapping_error( + info->id->device, request->sge[i+1].addr)) { + rc = -EIO; + request->sge[i+1].addr = 0; + goto dma_mapping_failure; + } + request->sge[i+1].length = sg->length; + request->sge[i+1].lkey = info->pd->local_dma_lkey; + request->num_sge++; + } + + rc = smbd_post_send(info, request, data_length); + if (!rc) + return 0; + +dma_mapping_failure: + for (i = 1; i < request->num_sge; i++) + if (request->sge[i].addr) + ib_dma_unmap_single(info->id->device, + request->sge[i].addr, + request->sge[i].length, + DMA_TO_DEVICE); + smbd_destroy_header(info, request); + return rc; +} + +/* + * Send an empty message + * Empty message is used to extend credits to peer to for keep live + * while there is no upper layer payload to send at the time + */ +static int smbd_post_send_empty(struct smbd_connection *info) +{ + info->count_send_empty++; + return smbd_post_send_sgl(info, NULL, 0, 0); +} + +/* + * Post a receive request to the transport + * The remote peer can only send data when a receive request is posted + * The interaction is controlled by send/receive credit system + */ +static int smbd_post_recv( + struct smbd_connection *info, struct smbd_response *response) +{ + struct ib_recv_wr recv_wr, *recv_wr_fail = NULL; + int rc = -EIO; + + response->sge.addr = ib_dma_map_single( + info->id->device, response->packet, + info->max_receive_size, DMA_FROM_DEVICE); + if (ib_dma_mapping_error(info->id->device, response->sge.addr)) + return rc; + + response->sge.length = info->max_receive_size; + response->sge.lkey = info->pd->local_dma_lkey; + + response->cqe.done = recv_done; + + recv_wr.wr_cqe = &response->cqe; + recv_wr.next = NULL; + recv_wr.sg_list = &response->sge; + recv_wr.num_sge = 1; + + rc = ib_post_recv(info->id->qp, &recv_wr, &recv_wr_fail); + if (rc) { + ib_dma_unmap_single(info->id->device, response->sge.addr, + response->sge.length, DMA_FROM_DEVICE); + + log_rdma_recv(ERR, "ib_post_recv failed rc=%d\n", rc); + } + + return rc; +} + +/* Perform SMBD negotiate according to [MS-SMBD] 3.1.5.2 */ +static int smbd_negotiate(struct smbd_connection *info) +{ + int rc; + struct smbd_response *response = get_receive_buffer(info); + + response->type = SMBD_NEGOTIATE_RESP; + rc = smbd_post_recv(info, response); + log_rdma_event(INFO, + "smbd_post_recv rc=%d iov.addr=%llx iov.length=%x " + "iov.lkey=%x\n", + rc, response->sge.addr, + response->sge.length, response->sge.lkey); + if (rc) + return rc; + + init_completion(&info->negotiate_completion); + info->negotiate_done = false; + rc = smbd_post_send_negotiate_req(info); + if (rc) + return rc; + + rc = wait_for_completion_interruptible_timeout( + &info->negotiate_completion, SMBD_NEGOTIATE_TIMEOUT * HZ); + log_rdma_event(INFO, "wait_for_completion_timeout rc=%d\n", rc); + + if (info->negotiate_done) + return 0; + + if (rc == 0) + rc = -ETIMEDOUT; + else if (rc == -ERESTARTSYS) + rc = -EINTR; + else + rc = -ENOTCONN; + + return rc; +} + +static void put_empty_packet( + struct smbd_connection *info, struct smbd_response *response) +{ + spin_lock(&info->empty_packet_queue_lock); + list_add_tail(&response->list, &info->empty_packet_queue); + info->count_empty_packet_queue++; + spin_unlock(&info->empty_packet_queue_lock); + + queue_work(info->workqueue, &info->post_send_credits_work); +} + +/* + * Implement Connection.FragmentReassemblyBuffer defined in [MS-SMBD] 3.1.1.1 + * This is a queue for reassembling upper layer payload and present to upper + * layer. All the inncoming payload go to the reassembly queue, regardless of + * if reassembly is required. The uuper layer code reads from the queue for all + * incoming payloads. + * Put a received packet to the reassembly queue + * response: the packet received + * data_length: the size of payload in this packet + */ +static void enqueue_reassembly( + struct smbd_connection *info, + struct smbd_response *response, + int data_length) +{ + spin_lock(&info->reassembly_queue_lock); + list_add_tail(&response->list, &info->reassembly_queue); + info->reassembly_queue_length++; + /* + * Make sure reassembly_data_length is updated after list and + * reassembly_queue_length are updated. On the dequeue side + * reassembly_data_length is checked without a lock to determine + * if reassembly_queue_length and list is up to date + */ + virt_wmb(); + info->reassembly_data_length += data_length; + spin_unlock(&info->reassembly_queue_lock); + info->count_reassembly_queue++; + info->count_enqueue_reassembly_queue++; +} + +/* + * Get the first entry at the front of reassembly queue + * Caller is responsible for locking + * return value: the first entry if any, NULL if queue is empty + */ +static struct smbd_response *_get_first_reassembly(struct smbd_connection *info) +{ + struct smbd_response *ret = NULL; + + if (!list_empty(&info->reassembly_queue)) { + ret = list_first_entry( + &info->reassembly_queue, + struct smbd_response, list); + } + return ret; +} + +static struct smbd_response *get_empty_queue_buffer( + struct smbd_connection *info) +{ + struct smbd_response *ret = NULL; + unsigned long flags; + + spin_lock_irqsave(&info->empty_packet_queue_lock, flags); + if (!list_empty(&info->empty_packet_queue)) { + ret = list_first_entry( + &info->empty_packet_queue, + struct smbd_response, list); + list_del(&ret->list); + info->count_empty_packet_queue--; + } + spin_unlock_irqrestore(&info->empty_packet_queue_lock, flags); + + return ret; +} + +/* + * Get a receive buffer + * For each remote send, we need to post a receive. The receive buffers are + * pre-allocated in advance. + * return value: the receive buffer, NULL if none is available + */ +static struct smbd_response *get_receive_buffer(struct smbd_connection *info) +{ + struct smbd_response *ret = NULL; + unsigned long flags; + + spin_lock_irqsave(&info->receive_queue_lock, flags); + if (!list_empty(&info->receive_queue)) { + ret = list_first_entry( + &info->receive_queue, + struct smbd_response, list); + list_del(&ret->list); + info->count_receive_queue--; + info->count_get_receive_buffer++; + } + spin_unlock_irqrestore(&info->receive_queue_lock, flags); + + return ret; +} + +/* + * Return a receive buffer + * Upon returning of a receive buffer, we can post new receive and extend + * more receive credits to remote peer. This is done immediately after a + * receive buffer is returned. + */ +static void put_receive_buffer( + struct smbd_connection *info, struct smbd_response *response) +{ + unsigned long flags; + + ib_dma_unmap_single(info->id->device, response->sge.addr, + response->sge.length, DMA_FROM_DEVICE); + + spin_lock_irqsave(&info->receive_queue_lock, flags); + list_add_tail(&response->list, &info->receive_queue); + info->count_receive_queue++; + info->count_put_receive_buffer++; + spin_unlock_irqrestore(&info->receive_queue_lock, flags); + + queue_work(info->workqueue, &info->post_send_credits_work); +} + +/* Preallocate all receive buffer on transport establishment */ +static int allocate_receive_buffers(struct smbd_connection *info, int num_buf) +{ + int i; + struct smbd_response *response; + + INIT_LIST_HEAD(&info->reassembly_queue); + spin_lock_init(&info->reassembly_queue_lock); + info->reassembly_data_length = 0; + info->reassembly_queue_length = 0; + + INIT_LIST_HEAD(&info->receive_queue); + spin_lock_init(&info->receive_queue_lock); + info->count_receive_queue = 0; + + INIT_LIST_HEAD(&info->empty_packet_queue); + spin_lock_init(&info->empty_packet_queue_lock); + info->count_empty_packet_queue = 0; + + init_waitqueue_head(&info->wait_receive_queues); + + for (i = 0; i < num_buf; i++) { + response = mempool_alloc(info->response_mempool, GFP_KERNEL); + if (!response) + goto allocate_failed; + + response->info = info; + list_add_tail(&response->list, &info->receive_queue); + info->count_receive_queue++; + } + + return 0; + +allocate_failed: + while (!list_empty(&info->receive_queue)) { + response = list_first_entry( + &info->receive_queue, + struct smbd_response, list); + list_del(&response->list); + info->count_receive_queue--; + + mempool_free(response, info->response_mempool); + } + return -ENOMEM; +} + +static void destroy_receive_buffers(struct smbd_connection *info) +{ + struct smbd_response *response; + + while ((response = get_receive_buffer(info))) + mempool_free(response, info->response_mempool); + + while ((response = get_empty_queue_buffer(info))) + mempool_free(response, info->response_mempool); +} + +/* + * Check and send an immediate or keep alive packet + * The condition to send those packets are defined in [MS-SMBD] 3.1.1.1 + * Connection.KeepaliveRequested and Connection.SendImmediate + * The idea is to extend credits to server as soon as it becomes available + */ +static void send_immediate_work(struct work_struct *work) +{ + struct smbd_connection *info = container_of( + work, struct smbd_connection, + send_immediate_work.work); + + if (info->keep_alive_requested == KEEP_ALIVE_PENDING || + info->send_immediate) { + log_keep_alive(INFO, "send an empty message\n"); + smbd_post_send_empty(info); + } +} + +/* Implement idle connection timer [MS-SMBD] 3.1.6.2 */ +static void idle_connection_timer(struct work_struct *work) +{ + struct smbd_connection *info = container_of( + work, struct smbd_connection, + idle_timer_work.work); + + if (info->keep_alive_requested != KEEP_ALIVE_NONE) { + log_keep_alive(ERR, + "error status info->keep_alive_requested=%d\n", + info->keep_alive_requested); + smbd_disconnect_rdma_connection(info); + return; + } + + log_keep_alive(INFO, "about to send an empty idle message\n"); + smbd_post_send_empty(info); + + /* Setup the next idle timeout work */ + queue_delayed_work(info->workqueue, &info->idle_timer_work, + info->keep_alive_interval*HZ); +} + +static void destroy_caches_and_workqueue(struct smbd_connection *info) +{ + destroy_receive_buffers(info); + destroy_workqueue(info->workqueue); + mempool_destroy(info->response_mempool); + kmem_cache_destroy(info->response_cache); + mempool_destroy(info->request_mempool); + kmem_cache_destroy(info->request_cache); +} + +#define MAX_NAME_LEN 80 +static int allocate_caches_and_workqueue(struct smbd_connection *info) +{ + char name[MAX_NAME_LEN]; + int rc; + + snprintf(name, MAX_NAME_LEN, "smbd_request_%p", info); + info->request_cache = + kmem_cache_create( + name, + sizeof(struct smbd_request) + + sizeof(struct smbd_data_transfer), + 0, SLAB_HWCACHE_ALIGN, NULL); + if (!info->request_cache) + return -ENOMEM; + + info->request_mempool = + mempool_create(info->send_credit_target, mempool_alloc_slab, + mempool_free_slab, info->request_cache); + if (!info->request_mempool) + goto out1; + + snprintf(name, MAX_NAME_LEN, "smbd_response_%p", info); + info->response_cache = + kmem_cache_create( + name, + sizeof(struct smbd_response) + + info->max_receive_size, + 0, SLAB_HWCACHE_ALIGN, NULL); + if (!info->response_cache) + goto out2; + + info->response_mempool = + mempool_create(info->receive_credit_max, mempool_alloc_slab, + mempool_free_slab, info->response_cache); + if (!info->response_mempool) + goto out3; + + snprintf(name, MAX_NAME_LEN, "smbd_%p", info); + info->workqueue = create_workqueue(name); + if (!info->workqueue) + goto out4; + + rc = allocate_receive_buffers(info, info->receive_credit_max); + if (rc) { + log_rdma_event(ERR, "failed to allocate receive buffers\n"); + goto out5; + } + + return 0; + +out5: + destroy_workqueue(info->workqueue); +out4: + mempool_destroy(info->response_mempool); +out3: + kmem_cache_destroy(info->response_cache); +out2: + mempool_destroy(info->request_mempool); +out1: + kmem_cache_destroy(info->request_cache); + return -ENOMEM; +} + +/* Create a SMBD connection, called by upper layer */ +struct smbd_connection *_smbd_get_connection( + struct TCP_Server_Info *server, struct sockaddr *dstaddr, int port) +{ + int rc; + struct smbd_connection *info; + struct rdma_conn_param conn_param; + struct ib_qp_init_attr qp_attr; + struct sockaddr_in *addr_in = (struct sockaddr_in *) dstaddr; + + info = kzalloc(sizeof(struct smbd_connection), GFP_KERNEL); + if (!info) + return NULL; + + info->transport_status = SMBD_CONNECTING; + rc = smbd_ia_open(info, dstaddr, port); + if (rc) { + log_rdma_event(INFO, "smbd_ia_open rc=%d\n", rc); + goto create_id_failed; + } + + if (smbd_send_credit_target > info->id->device->attrs.max_cqe || + smbd_send_credit_target > info->id->device->attrs.max_qp_wr) { + log_rdma_event(ERR, + "consider lowering send_credit_target = %d. " + "Possible CQE overrun, device " + "reporting max_cpe %d max_qp_wr %d\n", + smbd_send_credit_target, + info->id->device->attrs.max_cqe, + info->id->device->attrs.max_qp_wr); + goto config_failed; + } + + if (smbd_receive_credit_max > info->id->device->attrs.max_cqe || + smbd_receive_credit_max > info->id->device->attrs.max_qp_wr) { + log_rdma_event(ERR, + "consider lowering receive_credit_max = %d. " + "Possible CQE overrun, device " + "reporting max_cpe %d max_qp_wr %d\n", + smbd_receive_credit_max, + info->id->device->attrs.max_cqe, + info->id->device->attrs.max_qp_wr); + goto config_failed; + } + + info->receive_credit_max = smbd_receive_credit_max; + info->send_credit_target = smbd_send_credit_target; + info->max_send_size = smbd_max_send_size; + info->max_fragmented_recv_size = smbd_max_fragmented_recv_size; + info->max_receive_size = smbd_max_receive_size; + info->keep_alive_interval = smbd_keep_alive_interval; + + if (info->id->device->attrs.max_sge < SMBDIRECT_MAX_SGE) { + log_rdma_event(ERR, "warning: device max_sge = %d too small\n", + info->id->device->attrs.max_sge); + log_rdma_event(ERR, "Queue Pair creation may fail\n"); + } + + info->send_cq = NULL; + info->recv_cq = NULL; + info->send_cq = ib_alloc_cq(info->id->device, info, + info->send_credit_target, 0, IB_POLL_SOFTIRQ); + if (IS_ERR(info->send_cq)) { + info->send_cq = NULL; + goto alloc_cq_failed; + } + + info->recv_cq = ib_alloc_cq(info->id->device, info, + info->receive_credit_max, 0, IB_POLL_SOFTIRQ); + if (IS_ERR(info->recv_cq)) { + info->recv_cq = NULL; + goto alloc_cq_failed; + } + + memset(&qp_attr, 0, sizeof(qp_attr)); + qp_attr.event_handler = smbd_qp_async_error_upcall; + qp_attr.qp_context = info; + qp_attr.cap.max_send_wr = info->send_credit_target; + qp_attr.cap.max_recv_wr = info->receive_credit_max; + qp_attr.cap.max_send_sge = SMBDIRECT_MAX_SGE; + qp_attr.cap.max_recv_sge = SMBDIRECT_MAX_SGE; + qp_attr.cap.max_inline_data = 0; + qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; + qp_attr.qp_type = IB_QPT_RC; + qp_attr.send_cq = info->send_cq; + qp_attr.recv_cq = info->recv_cq; + qp_attr.port_num = ~0; + + rc = rdma_create_qp(info->id, info->pd, &qp_attr); + if (rc) { + log_rdma_event(ERR, "rdma_create_qp failed %i\n", rc); + goto create_qp_failed; + } + + memset(&conn_param, 0, sizeof(conn_param)); + conn_param.initiator_depth = 0; + + conn_param.retry_count = SMBD_CM_RETRY; + conn_param.rnr_retry_count = SMBD_CM_RNR_RETRY; + conn_param.flow_control = 0; + init_waitqueue_head(&info->wait_destroy); + + log_rdma_event(INFO, "connecting to IP %pI4 port %d\n", + &addr_in->sin_addr, port); + + init_waitqueue_head(&info->conn_wait); + rc = rdma_connect(info->id, &conn_param); + if (rc) { + log_rdma_event(ERR, "rdma_connect() failed with %i\n", rc); + goto rdma_connect_failed; + } + + wait_event_interruptible( + info->conn_wait, info->transport_status != SMBD_CONNECTING); + + if (info->transport_status != SMBD_CONNECTED) { + log_rdma_event(ERR, "rdma_connect failed port=%d\n", port); + goto rdma_connect_failed; + } + + log_rdma_event(INFO, "rdma_connect connected\n"); + + rc = allocate_caches_and_workqueue(info); + if (rc) { + log_rdma_event(ERR, "cache allocation failed\n"); + goto allocate_cache_failed; + } + + init_waitqueue_head(&info->wait_send_queue); + init_waitqueue_head(&info->wait_reassembly_queue); + + INIT_DELAYED_WORK(&info->idle_timer_work, idle_connection_timer); + INIT_DELAYED_WORK(&info->send_immediate_work, send_immediate_work); + queue_delayed_work(info->workqueue, &info->idle_timer_work, + info->keep_alive_interval*HZ); + + init_waitqueue_head(&info->wait_send_pending); + atomic_set(&info->send_pending, 0); + + init_waitqueue_head(&info->wait_send_payload_pending); + atomic_set(&info->send_payload_pending, 0); + + INIT_WORK(&info->disconnect_work, smbd_disconnect_rdma_work); + INIT_WORK(&info->destroy_work, smbd_destroy_rdma_work); + INIT_WORK(&info->recv_done_work, smbd_recv_done_work); + INIT_WORK(&info->post_send_credits_work, smbd_post_send_credits); + info->new_credits_offered = 0; + spin_lock_init(&info->lock_new_credits_offered); + + rc = smbd_negotiate(info); + if (rc) { + log_rdma_event(ERR, "smbd_negotiate rc=%d\n", rc); + goto negotiation_failed; + } + + return info; + +negotiation_failed: + cancel_delayed_work_sync(&info->idle_timer_work); + destroy_caches_and_workqueue(info); + info->transport_status = SMBD_NEGOTIATE_FAILED; + init_waitqueue_head(&info->conn_wait); + rdma_disconnect(info->id); + wait_event(info->conn_wait, + info->transport_status == SMBD_DISCONNECTED); + +allocate_cache_failed: +rdma_connect_failed: + rdma_destroy_qp(info->id); + +create_qp_failed: +alloc_cq_failed: + if (info->send_cq) + ib_free_cq(info->send_cq); + if (info->recv_cq) + ib_free_cq(info->recv_cq); + +config_failed: + ib_dealloc_pd(info->pd); + rdma_destroy_id(info->id); + +create_id_failed: + kfree(info); + return NULL; +} diff --git a/fs/cifs/smbdirect.h b/fs/cifs/smbdirect.h index c55f28bf7a7f..e4e65d3c6de8 100644 --- a/fs/cifs/smbdirect.h +++ b/fs/cifs/smbdirect.h @@ -16,6 +16,236 @@ #ifndef _SMBDIRECT_H #define _SMBDIRECT_H +#ifdef CONFIG_CIFS_SMB_DIRECT +#define cifs_rdma_enabled(server) ((server)->rdma) + +#include "cifsglob.h" +#include <rdma/ib_verbs.h> +#include <rdma/rdma_cm.h> +#include <linux/mempool.h> + +enum keep_alive_status { + KEEP_ALIVE_NONE, + KEEP_ALIVE_PENDING, + KEEP_ALIVE_SENT, +}; + +enum smbd_connection_status { + SMBD_CREATED, + SMBD_CONNECTING, + SMBD_CONNECTED, + SMBD_NEGOTIATE_FAILED, + SMBD_DISCONNECTING, + SMBD_DISCONNECTED, + SMBD_DESTROYED +}; + +/* + * The context for the SMBDirect transport + * Everything related to the transport is here. It has several logical parts + * 1. RDMA related structures + * 2. SMBDirect connection parameters + * 3. Memory registrations + * 4. Receive and reassembly queues for data receive path + * 5. mempools for allocating packets + */ +struct smbd_connection { + enum smbd_connection_status transport_status; + + /* RDMA related */ + struct rdma_cm_id *id; + struct ib_qp_init_attr qp_attr; + struct ib_pd *pd; + struct ib_cq *send_cq, *recv_cq; + struct ib_device_attr dev_attr; + int ri_rc; + struct completion ri_done; + wait_queue_head_t conn_wait; + wait_queue_head_t wait_destroy; + + struct completion negotiate_completion; + bool negotiate_done; + + struct work_struct destroy_work; + struct work_struct disconnect_work; + struct work_struct recv_done_work; + struct work_struct post_send_credits_work; + + spinlock_t lock_new_credits_offered; + int new_credits_offered; + + /* Connection parameters defined in [MS-SMBD] 3.1.1.1 */ + int receive_credit_max; + int send_credit_target; + int max_send_size; + int max_fragmented_recv_size; + int max_fragmented_send_size; + int max_receive_size; + int keep_alive_interval; + int max_readwrite_size; + enum keep_alive_status keep_alive_requested; + int protocol; + atomic_t send_credits; + atomic_t receive_credits; + int receive_credit_target; + int fragment_reassembly_remaining; + + /* Activity accoutning */ + + atomic_t send_pending; + wait_queue_head_t wait_send_pending; + atomic_t send_payload_pending; + wait_queue_head_t wait_send_payload_pending; + + /* Receive queue */ + struct list_head receive_queue; + int count_receive_queue; + spinlock_t receive_queue_lock; + + struct list_head empty_packet_queue; + int count_empty_packet_queue; + spinlock_t empty_packet_queue_lock; + + wait_queue_head_t wait_receive_queues; + + /* Reassembly queue */ + struct list_head reassembly_queue; + spinlock_t reassembly_queue_lock; + wait_queue_head_t wait_reassembly_queue; + + /* total data length of reassembly queue */ + int reassembly_data_length; + int reassembly_queue_length; + /* the offset to first buffer in reassembly queue */ + int first_entry_offset; + + bool send_immediate; + + wait_queue_head_t wait_send_queue; + + /* + * Indicate if we have received a full packet on the connection + * This is used to identify the first SMBD packet of a assembled + * payload (SMB packet) in reassembly queue so we can return a + * RFC1002 length to upper layer to indicate the length of the SMB + * packet received + */ + bool full_packet_received; + + struct workqueue_struct *workqueue; + struct delayed_work idle_timer_work; + struct delayed_work send_immediate_work; + + /* Memory pool for preallocating buffers */ + /* request pool for RDMA send */ + struct kmem_cache *request_cache; + mempool_t *request_mempool; + + /* response pool for RDMA receive */ + struct kmem_cache *response_cache; + mempool_t *response_mempool; + + /* for debug purposes */ + unsigned int count_get_receive_buffer; + unsigned int count_put_receive_buffer; + unsigned int count_reassembly_queue; + unsigned int count_enqueue_reassembly_queue; + unsigned int count_dequeue_reassembly_queue; + unsigned int count_send_empty; +}; + +enum smbd_message_type { + SMBD_NEGOTIATE_RESP, + SMBD_TRANSFER_DATA, +}; + +#define SMB_DIRECT_RESPONSE_REQUESTED 0x0001 + +/* SMBD negotiation request packet [MS-SMBD] 2.2.1 */ +struct smbd_negotiate_req { + __le16 min_version; + __le16 max_version; + __le16 reserved; + __le16 credits_requested; + __le32 preferred_send_size; + __le32 max_receive_size; + __le32 max_fragmented_size; +} __packed; + +/* SMBD negotiation response packet [MS-SMBD] 2.2.2 */ +struct smbd_negotiate_resp { + __le16 min_version; + __le16 max_version; + __le16 negotiated_version; + __le16 reserved; + __le16 credits_requested; + __le16 credits_granted; + __le32 status; + __le32 max_readwrite_size; + __le32 preferred_send_size; + __le32 max_receive_size; + __le32 max_fragmented_size; +} __packed; + +/* SMBD data transfer packet with payload [MS-SMBD] 2.2.3 */ +struct smbd_data_transfer { + __le16 credits_requested; + __le16 credits_granted; + __le16 flags; + __le16 reserved; + __le32 remaining_data_length; + __le32 data_offset; + __le32 data_length; + __le32 padding; + __u8 buffer[]; +} __packed; + +/* The packet fields for a registered RDMA buffer */ +struct smbd_buffer_descriptor_v1 { + __le64 offset; + __le32 token; + __le32 length; +} __packed; + /* Default maximum number of SGEs in a RDMA send/recv */ #define SMBDIRECT_MAX_SGE 16 +/* The context for a SMBD request */ +struct smbd_request { + struct smbd_connection *info; + struct ib_cqe cqe; + + /* true if this request carries upper layer payload */ + bool has_payload; + + /* the SGE entries for this packet */ + struct ib_sge sge[SMBDIRECT_MAX_SGE]; + int num_sge; + + /* SMBD packet header follows this structure */ + u8 packet[]; +}; + +/* The context for a SMBD response */ +struct smbd_response { + struct smbd_connection *info; + struct ib_cqe cqe; + struct ib_sge sge; + + enum smbd_message_type type; + + /* Link to receive queue or reassembly queue */ + struct list_head list; + + /* Indicate if this is the 1st packet of a payload */ + bool first_segment; + + /* SMBD packet header and payload follows this structure */ + u8 packet[]; +}; + +#else +#define cifs_rdma_enabled(server) 0 +struct smbd_connection {}; +#endif + #endif |