/fs/cifs/smbdirect.c
C | 1714 lines | 1259 code | 266 blank | 189 comment | 148 complexity | 1f069b04ba7466779ccc659aa99ec839 MD5 | raw file
- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Copyright (C) 2017, Microsoft Corporation.
- *
- * Author(s): Long Li <longli@microsoft.com>
- */
- #include <linux/module.h>
- #include <linux/highmem.h>
- #include "smbdirect.h"
- #include "cifs_debug.h"
- #include "cifsproto.h"
- #include "smb2proto.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);
- static int smbd_post_send_data(
- struct smbd_connection *info,
- struct kvec *iov, int n_vec, int remaining_data_length);
- static int smbd_post_send_page(struct smbd_connection *info,
- struct page *page, unsigned long offset,
- size_t size, int remaining_data_length);
- static void destroy_mr_list(struct smbd_connection *info);
- static int allocate_mr_list(struct smbd_connection *info);
- /* SMBD version number */
- #define SMBD_V1 0x0100
- /* Port numbers for SMBD transport */
- #define SMB_PORT 445
- #define SMBD_PORT 5445
- /* Address lookup and resolve timeout in ms */
- #define RDMA_RESOLVE_TIMEOUT 5000
- /* SMBD negotiation timeout in seconds */
- #define SMBD_NEGOTIATE_TIMEOUT 120
- /* SMBD minimum receive size and fragmented sized defined in [MS-SMBD] */
- #define SMBD_MIN_RECEIVE_SIZE 128
- #define SMBD_MIN_FRAGMENTED_SIZE 131072
- /*
- * Default maximum number of RDMA read/write outstanding on this connection
- * This value is possibly decreased during QP creation on hardware limit
- */
- #define SMBD_CM_RESPONDER_RESOURCES 32
- /* Maximum number of retries on data transfer operations */
- #define SMBD_CM_RETRY 6
- /* No need to retry on Receiver Not Ready since SMBD manages credits */
- #define SMBD_CM_RNR_RETRY 0
- /*
- * User configurable initial values per SMBD transport connection
- * as defined in [MS-SMBD] 3.1.1.1
- * Those may change after a SMBD negotiation
- */
- /* The local peer's maximum number of credits to grant to the peer */
- int smbd_receive_credit_max = 255;
- /* The remote peer's credit request of local peer */
- int smbd_send_credit_target = 255;
- /* The maximum single message size can be sent to remote peer */
- int smbd_max_send_size = 1364;
- /* The maximum fragmented upper-layer payload receive size supported */
- int smbd_max_fragmented_recv_size = 1024 * 1024;
- /* The maximum single-message size which can be received */
- int smbd_max_receive_size = 8192;
- /* The timeout to initiate send of a keepalive message on idle */
- int smbd_keep_alive_interval = 120;
- /*
- * User configurable initial values for RDMA transport
- * The actual values used may be lower and are limited to hardware capabilities
- */
- /* Default maximum number of SGEs in a RDMA write/read */
- 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)
- 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;
- wake_up_interruptible(&info->disconn_wait);
- wake_up_interruptible(&info->wait_reassembly_queue);
- wake_up_interruptible_all(&info->wait_send_queue);
- 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);
- break;
- 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 (atomic_dec_and_test(&request->info->send_pending))
- wake_up(&request->info->wait_send_pending);
- wake_up(&request->info->wait_post_send);
- 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);
- info->rdma_readwrite_threshold =
- rdma_readwrite_threshold > info->max_fragmented_send_size ?
- info->max_fragmented_send_size :
- rdma_readwrite_threshold;
- info->max_readwrite_size = min_t(u32,
- le32_to_cpu(packet->max_readwrite_size),
- info->max_frmr_depth * PAGE_SIZE);
- info->max_frmr_depth = info->max_readwrite_size / PAGE_SIZE;
- return true;
- }
- 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);
- /* Promptly send an immediate packet as defined in [MS-SMBD] 3.1.1.1 */
- info->send_immediate = true;
- if (atomic_read(&info->receive_credits) <
- info->receive_credit_target - 1) {
- 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);
- }
- }
- }
- /* 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);
- if (le16_to_cpu(data_transfer->credits_granted)) {
- atomic_add(le16_to_cpu(data_transfer->credits_granted),
- &info->send_credits);
- /*
- * We have new send credits granted from remote peer
- * If any sender is waiting for credits, unblock it
- */
- wake_up_interruptible(&info->wait_send_queue);
- }
- 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;
- }
- 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;
- }
- rc = wait_for_completion_interruptible_timeout(
- &info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT));
- /* e.g. if interrupted returns -ERESTARTSYS */
- if (rc < 0) {
- log_rdma_event(ERR, "rdma_resolve_addr timeout rc: %i\n", rc);
- goto out;
- }
- 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;
- }
- rc = wait_for_completion_interruptible_timeout(
- &info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT));
- /* e.g. if interrupted returns -ERESTARTSYS */
- if (rc < 0) {
- log_rdma_event(ERR, "rdma_resolve_addr timeout rc: %i\n", rc);
- goto out;
- }
- 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->max_frmr_depth = min_t(int,
- smbd_max_frmr_depth,
- info->id->device->attrs.max_fast_reg_page_list_len);
- info->mr_type = IB_MR_TYPE_MEM_REG;
- if (info->id->device->attrs.kernel_cap_flags & IBK_SG_GAPS_REG)
- info->mr_type = IB_MR_TYPE_SG_GAPS;
- 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;
- 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);
- atomic_inc(&info->send_pending);
- rc = ib_post_send(info->id->qp, &send_wr, NULL);
- 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);
- smbd_disconnect_rdma_connection(info);
- 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;
- }
- /* Post the send request */
- static int smbd_post_send(struct smbd_connection *info,
- struct smbd_request *request)
- {
- struct ib_send_wr send_wr;
- int rc, i;
- for (i = 0; i < request->num_sge; i++) {
- log_rdma_send(INFO,
- "rdma_request sge[%d] addr=%llu length=%u\n",
- i, request->sge[i].addr, request->sge[i].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;
- rc = ib_post_send(info->id->qp, &send_wr, NULL);
- if (rc) {
- log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc);
- smbd_disconnect_rdma_connection(info);
- rc = -EAGAIN;
- } 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;
- int header_length;
- struct smbd_request *request;
- struct smbd_data_transfer *packet;
- int new_credits;
- struct scatterlist *sg;
- wait_credit:
- /* 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)
- goto err_wait_credit;
- if (info->transport_status != SMBD_CONNECTED) {
- log_outgoing(ERR, "disconnected not sending on wait_credit\n");
- rc = -EAGAIN;
- goto err_wait_credit;
- }
- if (unlikely(atomic_dec_return(&info->send_credits) < 0)) {
- atomic_inc(&info->send_credits);
- goto wait_credit;
- }
- wait_send_queue:
- wait_event(info->wait_post_send,
- atomic_read(&info->send_pending) < info->send_credit_target ||
- info->transport_status != SMBD_CONNECTED);
- if (info->transport_status != SMBD_CONNECTED) {
- log_outgoing(ERR, "disconnected not sending on wait_send_queue\n");
- rc = -EAGAIN;
- goto err_wait_send_queue;
- }
- if (unlikely(atomic_inc_return(&info->send_pending) >
- info->send_credit_target)) {
- atomic_dec(&info->send_pending);
- goto wait_send_queue;
- }
- request = mempool_alloc(info->request_mempool, GFP_KERNEL);
- if (!request) {
- rc = -ENOMEM;
- goto err_alloc;
- }
- request->info = info;
- /* Fill in the packet header */
- packet = smbd_request_payload(request);
- packet->credits_requested = cpu_to_le16(info->send_credit_target);
- new_credits = manage_credits_prior_sending(info);
- atomic_add(new_credits, &info->receive_credits);
- packet->credits_granted = cpu_to_le16(new_credits);
- 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 (!data_length)
- packet->data_offset = 0;
- else
- packet->data_offset = cpu_to_le32(24);
- packet->data_length = cpu_to_le32(data_length);
- 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 (!data_length)
- 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_TO_DEVICE);
- if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) {
- rc = -EIO;
- request->sge[0].addr = 0;
- goto err_dma;
- }
- request->sge[0].length = header_length;
- request->sge[0].lkey = info->pd->local_dma_lkey;
- /* Fill in the packet data payload */
- 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_TO_DEVICE);
- if (ib_dma_mapping_error(
- info->id->device, request->sge[i+1].addr)) {
- rc = -EIO;
- request->sge[i+1].addr = 0;
- goto err_dma;
- }
- 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);
- if (!rc)
- return 0;
- err_dma:
- for (i = 0; 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);
- mempool_free(request, info->request_mempool);
- /* roll back receive credits and credits to be offered */
- spin_lock(&info->lock_new_credits_offered);
- info->new_credits_offered += new_credits;
- spin_unlock(&info->lock_new_credits_offered);
- atomic_sub(new_credits, &info->receive_credits);
- err_alloc:
- if (atomic_dec_and_test(&info->send_pending))
- wake_up(&info->wait_send_pending);
- err_wait_send_queue:
- /* roll back send credits and pending */
- atomic_inc(&info->send_credits);
- err_wait_credit:
- return rc;
- }
- /*
- * Send a page
- * page: the page to send
- * offset: offset in the page to send
- * size: length in the page to send
- * remaining_data_length: remaining data to send in this payload
- */
- static int smbd_post_send_page(struct smbd_connection *info, struct page *page,
- unsigned long offset, size_t size, int remaining_data_length)
- {
- struct scatterlist sgl;
- sg_init_table(&sgl, 1);
- sg_set_page(&sgl, page, size, offset);
- return smbd_post_send_sgl(info, &sgl, size, remaining_data_length);
- }
- /*
- * 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);
- }
- /*
- * Send a data buffer
- * iov: the iov array describing the data buffers
- * n_vec: number of iov array
- * remaining_data_length: remaining data to send following this packet
- * in segmented SMBD packet
- */
- static int smbd_post_send_data(
- struct smbd_connection *info, struct kvec *iov, int n_vec,
- int remaining_data_length)
- {
- int i;
- u32 data_length = 0;
- struct scatterlist sgl[SMBDIRECT_MAX_SGE];
- if (n_vec > SMBDIRECT_MAX_SGE) {
- cifs_dbg(VFS, "Can't fit data to SGL, n_vec=%d\n", n_vec);
- return -EINVAL;
- }
- sg_init_table(sgl, n_vec);
- for (i = 0; i < n_vec; i++) {
- data_length += iov[i].iov_len;
- sg_set_buf(&sgl[i], iov[i].iov_base, iov[i].iov_len);
- }
- return smbd_post_send_sgl(info, sgl, data_length, remaining_data_length);
- }
- /*
- * 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;
- 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, NULL);
- if (rc) {
- ib_dma_unmap_single(info->id->device, response->sge.addr,
- response->sge.length, DMA_FROM_DEVICE);
- smbd_disconnect_rdma_connection(info);
- 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);
- }
- /* 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);
- }
- /*
- * 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
- */
- void smbd_destroy(struct TCP_Server_Info *server)
- {
- struct smbd_connection *info = server->smbd_conn;
- struct smbd_response *response;
- unsigned long flags;
- if (!info) {
- log_rdma_event(INFO, "rdma session already destroyed\n");
- return;
- }
- log_rdma_event(INFO, "destroying rdma session\n");
- if (info->transport_status != SMBD_DISCONNECTED) {
- rdma_disconnect(server->smbd_conn->id);
- log_rdma_event(INFO, "wait for transport being disconnected\n");
- wait_event_interruptible(
- info->disconn_wait,
- info->transport_status == SMBD_DISCONNECTED);
- }
- log_rdma_event(INFO, "destroying qp\n");
- ib_drain_qp(info->id->qp);
- rdma_destroy_qp(info->id);
- log_rdma_event(INFO, "cancelling idle timer\n");
- cancel_delayed_work_sync(&info->idle_timer_work);
- 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);
- /* It's not possible 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);
- } else
- spin_unlock_irqrestore(
- &info->reassembly_queue_lock, flags);
- } while (response);
- 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);
- /*
- * For performance reasons, memory registration and deregistration
- * are not locked by srv_mutex. It is possible some processes are
- * blocked on transport srv_mutex while holding memory registration.
- * Release the transport srv_mutex to allow them to hit the failure
- * path when sending data, and then release memory registartions.
- */
- log_rdma_event(INFO, "freeing mr list\n");
- wake_up_interruptible_all(&info->wait_mr);
- while (atomic_read(&info->mr_used_count)) {
- cifs_server_unlock(server);
- msleep(1000);
- cifs_server_lock(server);
- }
- destroy_mr_list(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;
- destroy_workqueue(info->workqueue);
- log_rdma_event(INFO, "rdma session destroyed\n");
- kfree(info);
- }
- /*
- * Reconnect this SMBD connection, called from upper layer
- * return value: 0 on success, or actual error code
- */
- int smbd_reconnect(struct TCP_Server_Info *server)
- {
- log_rdma_event(INFO, "reconnecting rdma session\n");
- if (!server->smbd_conn) {
- log_rdma_event(INFO, "rdma session already destroyed\n");
- goto create_conn;
- }
- /*
- * This is possible if transport is disconnected and we haven't received
- * notification from RDMA, but upper layer has detected timeout
- */
- if (server->smbd_conn->transport_status == SMBD_CONNECTED) {
- log_rdma_event(INFO, "disconnecting transport\n");
- smbd_destroy(server);
- }
- create_conn:
- log_rdma_event(INFO, "creating rdma session\n");
- server->smbd_conn = smbd_get_connection(
- server, (struct sockaddr *) &server->dstaddr);
- if (server->smbd_conn)
- cifs_dbg(VFS, "RDMA transport re-established\n");
- return server->smbd_conn ? 0 : -ENOENT;
- }
- 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;
- scnprintf(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;
- scnprintf(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;
- scnprintf(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 */
- static 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;
- struct ib_port_immutable port_immutable;
- u32 ird_ord_hdr[2];
- 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_send_sge < SMBDIRECT_MAX_SGE) {
- log_rdma_event(ERR,
- "warning: device max_send_sge = %d too small\n",
- info->id->device->attrs.max_send_sge);
- log_rdma_event(ERR, "Queue Pair creation may fail\n");
- }
- if (info->id->device->attrs.max_recv_sge < SMBDIRECT_MAX_SGE) {
- log_rdma_event(ERR,
- "warning: device max_recv_sge = %d too small\n",
- info->id->device->attrs.max_recv_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_any(info->id->device, info,
- info->send_credit_target, IB_POLL_SOFTIRQ);
- if (IS_ERR(info->send_cq)) {
- info->send_cq = NULL;
- goto alloc_cq_failed;
- }
- info->recv_cq =
- ib_alloc_cq_any(info->id->device, info,
- info->receive_credit_max, 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.responder_resources =
- info->id->device->attrs.max_qp_rd_atom
- < SMBD_CM_RESPONDER_RESOURCES ?
- info->id->device->attrs.max_qp_rd_atom :
- SMBD_CM_RESPONDER_RESOURCES;
- info->responder_resources = conn_param.responder_resources;
- log_rdma_mr(INFO, "responder_resources=%d\n",
- info->responder_resources);
- /* Need to send IRD/ORD in private data for iWARP */
- info->id->device->ops.get_port_immutable(
- info->id->device, info->id->port_num, &port_immutable);
- if (port_immutable.core_cap_flags & RDMA_CORE_PORT_IWARP) {
- ird_ord_hdr[0] = info->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 = SMBD_CM_RETRY;
- conn_param.rnr_retry_count = SMBD_CM_RNR_RETRY;
- conn_param.flow_control = 0;
- log_rdma_event(INFO, "connecting to IP %pI4 port %d\n",
- &addr_in->sin_addr, port);
- init_waitqueue_head(&info->conn_wait);
- init_waitqueue_head(&info->disconn_wait);
- init_waitqueue_head(&info->wait_reassembly_queue);
- 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_DELAYED_WORK(&info->idle_timer_work, idle_connection_timer);
- 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_post_send);
- INIT_WORK(&info->disconnect_work, smbd_disconnect_rdma_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;
- }
- rc = allocate_mr_list(info);
- if (rc) {
- log_rdma_mr(ERR, "memory registration allocation failed\n");
- goto allocate_mr_failed;
- }
- return info;
- allocate_mr_failed:
- /* At this point, need to a full transport shutdown */
- smbd_destroy(server);
- return NULL;
- 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->tran