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smbdirect.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2017, Microsoft Corporation.
*
* Author(s): Long Li <[email protected]>
*/
#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);
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;
}
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->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.device_cap_flags & IB_DEVICE_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