summaryrefslogtreecommitdiffstats
path: root/fs/cifs
diff options
context:
space:
mode:
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/smbdirect.c220
1 files changed, 97 insertions, 123 deletions
diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index fa52bf3e0236..dd3e119da296 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -800,41 +800,91 @@ static int manage_keep_alive_before_sending(struct smbd_connection *info)
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)
+/* 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 header_length;
int new_credits;
- int rc;
+ 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)
- return rc;
+ goto err_wait_credit;
if (info->transport_status != SMBD_CONNECTED) {
- log_outgoing(ERR, "disconnected not sending\n");
- return -EAGAIN;
+ 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;
}
- atomic_dec(&info->send_credits);
request = mempool_alloc(info->request_mempool, GFP_KERNEL);
if (!request) {
@@ -859,11 +909,11 @@ static int smbd_create_header(struct smbd_connection *info,
packet->flags |= cpu_to_le16(SMB_DIRECT_RESPONSE_REQUESTED);
packet->reserved = 0;
- if (!size)
+ if (!data_length)
packet->data_offset = 0;
else
packet->data_offset = cpu_to_le32(24);
- packet->data_length = cpu_to_le32(size);
+ packet->data_length = cpu_to_le32(data_length);
packet->remaining_data_length = cpu_to_le32(remaining_data_length);
packet->padding = 0;
@@ -878,7 +928,7 @@ static int smbd_create_header(struct smbd_connection *info,
/* 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)
+ if (!data_length)
header_length = offsetof(struct smbd_data_transfer, padding);
request->num_sge = 1;
@@ -887,107 +937,15 @@ static int smbd_create_header(struct smbd_connection *info,
header_length,
DMA_TO_DEVICE);
if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) {
- mempool_free(request, info->request_mempool);
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;
- *request_out = request;
- return 0;
-
-err_dma:
- /* roll back receive credits */
- 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:
- /* roll back send credits */
- 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)
-{
- 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;
-
-wait_sq:
- wait_event(info->wait_post_send,
- atomic_read(&info->send_pending) < info->send_credit_target);
- if (unlikely(atomic_inc_return(&info->send_pending) >
- info->send_credit_target)) {
- atomic_dec(&info->send_pending);
- goto wait_sq;
- }
-
- rc = ib_post_send(info->id->qp, &send_wr, NULL);
- if (rc) {
- log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc);
- if (atomic_dec_and_test(&info->send_pending))
- wake_up(&info->wait_send_pending);
- 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;
- struct smbd_request *request;
- struct scatterlist *sg;
-
- rc = smbd_create_header(
- info, data_length, remaining_data_length, &request);
- if (rc)
- return rc;
-
+ /* 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 =
@@ -997,7 +955,7 @@ static int smbd_post_send_sgl(struct smbd_connection *info,
info->id->device, request->sge[i+1].addr)) {
rc = -EIO;
request->sge[i+1].addr = 0;
- goto dma_mapping_failure;
+ goto err_dma;
}
request->sge[i+1].length = sg->length;
request->sge[i+1].lkey = info->pd->local_dma_lkey;
@@ -1008,14 +966,30 @@ static int smbd_post_send_sgl(struct smbd_connection *info,
if (!rc)
return 0;
-dma_mapping_failure:
- for (i = 1; i < request->num_sge; i++)
+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);
- smbd_destroy_header(info, request);
+ 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;
}
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-02 13:13:27 +0100