> -----Original Message----- > From: Leif Sahlberg [mailto:lsahlber@xxxxxxxxxx] > Sent: Sunday, November 19, 2017 9:47 PM > To: Long Li <longli@xxxxxxxxxxxxx> > Cc: Steve French <sfrench@xxxxxxxxx>; linux-cifs@xxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx; linux-rdma@xxxxxxxxxxxxxxx; Christoph Hellwig > <hch@xxxxxxxxxxxxx>; Tom Talpey <ttalpey@xxxxxxxxxxxxx>; Matthew > Wilcox <mawilcox@xxxxxxxxxxxxx>; Stephen Hemminger > <sthemmin@xxxxxxxxxxxxx>; Long Li <longli@xxxxxxxxxxxxx> > Subject: Re: [Patch v7 05/22] CIFS: SMBD: Establish SMB Direct connection > > Acked-by: Ronnie Sahlberg <lsahlber@xxxxxxxxx> > > But two tiny nits: > + * e.g. cifs.smbd_logging_class=0x500 will log all log_rdma_recv() and > Should be 0xa0 > > +// queue_work(info->workqueue, &info->destroy_work); > Don't leave commented out code in there. I will address those. Thanks! > > > ----- Original Message ----- > From: "Long Li" <longli@xxxxxxxxxxxxxxxxxxxxxx> > To: "Steve French" <sfrench@xxxxxxxxx>, linux-cifs@xxxxxxxxxxxxxxx, > samba-technical@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux- > rdma@xxxxxxxxxxxxxxx, "Christoph Hellwig" <hch@xxxxxxxxxxxxx>, "Tom > Talpey" <ttalpey@xxxxxxxxxxxxx>, "Matthew Wilcox" > <mawilcox@xxxxxxxxxxxxx>, "Stephen Hemminger" > <sthemmin@xxxxxxxxxxxxx> > Cc: "Long Li" <longli@xxxxxxxxxxxxx> > Sent: Tuesday, 7 November, 2017 7:54:57 PM > Subject: [Patch v7 05/22] CIFS: SMBD: Establish SMB Direct connection > > From: Long Li <longli@xxxxxxxxxxxxx> > > Add code to implement the core functions to establish a SMB Direct > connection. > > 1. Establish an RDMA connection to SMB server. > 2. Negotiate and setup SMB Direct protocol. > 3. Implement idle connection timer and credit management. > > SMB Direct is enabled by setting CONFIG_CIFS_SMB_DIRECT. > > Add to Makefile to enable building SMB Direct. > > Signed-off-by: Long Li <longli@xxxxxxxxxxxxx> > --- > fs/cifs/Makefile | 2 + > fs/cifs/smbdirect.c | 1576 > +++++++++++++++++++++++++++++++++++++++++++++++++++ > fs/cifs/smbdirect.h | 280 +++++++++ > 3 files changed, 1858 insertions(+) > > diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile > index 5e853a3..ad00873 100644 > --- a/fs/cifs/Makefile > +++ b/fs/cifs/Makefile > @@ -18,3 +18,5 @@ 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 d3c16f8..021d527 100644 > --- a/fs/cifs/smbdirect.c > +++ b/fs/cifs/smbdirect.c > @@ -13,7 +13,34 @@ > * 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, > + bool lock); > +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 +102,1552 @@ 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=0x500 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 = 0; > +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, true); > + } > + } 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) > +{ > +// queue_work(info->workqueue, &info->destroy_work); > + 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, true); > + 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, true); > +} > + > +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, > + bool lock) > +{ > + unsigned long flags; > + > + ib_dma_unmap_single(info->id->device, response->sge.addr, > + response->sge.length, DMA_FROM_DEVICE); > + > + if (lock) > + 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++; > + if (lock) > + 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 (SMBDIRECT_MAX_SGE > info->id->device->attrs.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 c55f28b..35bc25b 100644 > --- a/fs/cifs/smbdirect.h > +++ b/fs/cifs/smbdirect.h > @@ -16,6 +16,286 @@ > #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[]; > +}; > + > +/* Create a SMBDirect session */ > +struct smbd_connection *smbd_get_connection( > + struct TCP_Server_Info *server, struct sockaddr *dstaddr); > + > +/* Reconnect SMBDirect session */ > +int smbd_reconnect(struct TCP_Server_Info *server); > + > +/* Destroy SMBDirect session */ > +void smbd_destroy(struct smbd_connection *info); > + > +/* Interface for carrying upper layer I/O through send/recv */ > +int smbd_recv(struct smbd_connection *info, struct msghdr *msg); > +int smbd_send(struct smbd_connection *info, struct smb_rqst *rqst); > + > +enum mr_state { > + MR_READY, > + MR_REGISTERED, > + MR_INVALIDATED, > + MR_ERROR > +}; > + > +struct smbd_mr { > + struct smbd_connection *conn; > + struct list_head list; > + enum mr_state state; > + struct ib_mr *mr; > + struct scatterlist *sgl; > + int sgl_count; > + enum dma_data_direction dir; > + union { > + struct ib_reg_wr wr; > + struct ib_send_wr inv_wr; > + }; > + struct ib_cqe cqe; > + bool need_invalidate; > + struct completion invalidate_done; > +}; > + > +/* Interfaces to register and deregister MR for RDMA read/write */ > +struct smbd_mr *smbd_register_mr( > + struct smbd_connection *info, struct page *pages[], int num_pages, > + int tailsz, bool writing, bool need_invalidate); > +int smbd_deregister_mr(struct smbd_mr *mr); > + > +#else > +#define cifs_rdma_enabled(server) 0 > +struct smbd_connection{}; > +static inline void *smbd_get_connection( > + struct TCP_Server_Info *server, struct sockaddr *dstaddr) {return > NULL;} > +static inline int smbd_reconnect(struct TCP_Server_Info *server) {return - > 1;} > +static inline void smbd_destroy(struct smbd_connection *info) {} > +static inline int smbd_recv(struct smbd_connection *info, struct msghdr > *msg) {return -1;} > +static inline int smbd_send(struct smbd_connection *info, struct smb_rqst > *rqst) {return -1;} > +#endif > + > #endif > -- > 2.7.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-cifs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at > https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fvger.ke > rnel.org%2Fmajordomo- > info.html&data=02%7C01%7Clongli%40microsoft.com%7Ce7da39e3ff8f409ea > 29208d52fda17a4%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636 > 467536124091212&sdata=eRCijuXR1Y%2FsFds3UZDrdK6AoDutBBLCQ0UZU5v > 5XAc%3D&reserved=0 ��.n��������+%������w��{.n�����{���fk��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
