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* [PATCH 1/2] cifs:smbd When reconnecting to server, call smbd_destroy() after all MIDs have been called
@ 2019-05-14  4:01 longli
  2019-05-14  4:01 ` [PATCH 2/2] cifs:smbd Use the correct DMA direction when sending data longli
  2019-05-14 21:11 ` [PATCH 1/2] cifs:smbd When reconnecting to server, call smbd_destroy() after all MIDs have been called Pavel Shilovsky
  0 siblings, 2 replies; 5+ messages in thread
From: longli @ 2019-05-14  4:01 UTC (permalink / raw)
  To: Steve French, linux-cifs, samba-technical, linux-kernel; +Cc: Long Li

From: Long Li <longli@microsoft.com>

commit 214bab448476 ("cifs: Call MID callback before destroying transport")
assumes that the MID callback should not take srv_mutex, this may not always
be true. SMB Direct requires the MID callback completed before calling
transport so all pending memory registration can be freed. So restore the
orignal calling sequence so TCP transport will use the same code, but moving
smbd_destroy() after all MID has been called.

fixes: 214bab448476 ("cifs: Call MID callback before destroying transport")
Signed-off-by: Long Li <longli@microsoft.com>
---
 fs/cifs/connect.c | 37 ++++++++++++++++++++-----------------
 1 file changed, 20 insertions(+), 17 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 084756cfdaee..0b3ac8b76d18 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -528,6 +528,21 @@ cifs_reconnect(struct TCP_Server_Info *server)
 	/* do not want to be sending data on a socket we are freeing */
 	cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
 	mutex_lock(&server->srv_mutex);
+	if (server->ssocket) {
+		cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
+			 server->ssocket->state, server->ssocket->flags);
+		kernel_sock_shutdown(server->ssocket, SHUT_WR);
+		cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
+			 server->ssocket->state, server->ssocket->flags);
+		sock_release(server->ssocket);
+		server->ssocket = NULL;
+	}
+	server->sequence_number = 0;
+	server->session_estab = false;
+	kfree(server->session_key.response);
+	server->session_key.response = NULL;
+	server->session_key.len = 0;
+	server->lstrp = jiffies;
 
 	/* mark submitted MIDs for retry and issue callback */
 	INIT_LIST_HEAD(&retry_list);
@@ -540,6 +555,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
 		list_move(&mid_entry->qhead, &retry_list);
 	}
 	spin_unlock(&GlobalMid_Lock);
+	mutex_unlock(&server->srv_mutex);
 
 	cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
 	list_for_each_safe(tmp, tmp2, &retry_list) {
@@ -548,24 +564,11 @@ cifs_reconnect(struct TCP_Server_Info *server)
 		mid_entry->callback(mid_entry);
 	}
 
-	if (server->ssocket) {
-		cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
-			 server->ssocket->state, server->ssocket->flags);
-		kernel_sock_shutdown(server->ssocket, SHUT_WR);
-		cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
-			 server->ssocket->state, server->ssocket->flags);
-		sock_release(server->ssocket);
-		server->ssocket = NULL;
-	} else if (cifs_rdma_enabled(server))
+	if (cifs_rdma_enabled(server)) {
+		mutex_lock(&server->srv_mutex);
 		smbd_destroy(server);
-	server->sequence_number = 0;
-	server->session_estab = false;
-	kfree(server->session_key.response);
-	server->session_key.response = NULL;
-	server->session_key.len = 0;
-	server->lstrp = jiffies;
-
-	mutex_unlock(&server->srv_mutex);
+		mutex_unlock(&server->srv_mutex);
+	}
 
 	do {
 		try_to_freeze();
-- 
2.17.1


^ permalink raw reply	[flat|nested] 5+ messages in thread

* [PATCH 2/2] cifs:smbd Use the correct DMA direction when sending data
  2019-05-14  4:01 [PATCH 1/2] cifs:smbd When reconnecting to server, call smbd_destroy() after all MIDs have been called longli
@ 2019-05-14  4:01 ` longli
  2019-05-14 21:41   ` Pavel Shilovsky
  2019-05-15  4:16   ` Steve French
  2019-05-14 21:11 ` [PATCH 1/2] cifs:smbd When reconnecting to server, call smbd_destroy() after all MIDs have been called Pavel Shilovsky
  1 sibling, 2 replies; 5+ messages in thread
From: longli @ 2019-05-14  4:01 UTC (permalink / raw)
  To: Steve French, linux-cifs, samba-technical, linux-kernel; +Cc: Long Li

From: Long Li <longli@microsoft.com>

When sending data, use the DMA_TO_DEVICE to map buffers. Also log the number
of requests in a compounding request from upper layer.

Signed-off-by: Long Li <longli@microsoft.com>
---
 fs/cifs/smbdirect.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 251ef1223206..caac37b1de8c 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -903,7 +903,7 @@ static int smbd_create_header(struct smbd_connection *info,
 	request->sge[0].addr = ib_dma_map_single(info->id->device,
 						 (void *)packet,
 						 header_length,
-						 DMA_BIDIRECTIONAL);
+						 DMA_TO_DEVICE);
 	if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) {
 		mempool_free(request, info->request_mempool);
 		rc = -EIO;
@@ -1005,7 +1005,7 @@ static int smbd_post_send_sgl(struct smbd_connection *info,
 	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);
+			       sg->offset, sg->length, DMA_TO_DEVICE);
 		if (ib_dma_mapping_error(
 				info->id->device, request->sge[i+1].addr)) {
 			rc = -EIO;
@@ -2110,8 +2110,10 @@ int smbd_send(struct TCP_Server_Info *server,
 		goto done;
 	}
 
-	rqst_idx = 0;
+	log_write(INFO, "num_rqst=%d total length=%u\n",
+			num_rqst, remaining_data_length);
 
+	rqst_idx = 0;
 next_rqst:
 	rqst = &rqst_array[rqst_idx];
 	iov = rqst->rq_iov;
-- 
2.17.1


^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH 1/2] cifs:smbd When reconnecting to server, call smbd_destroy() after all MIDs have been called
  2019-05-14  4:01 [PATCH 1/2] cifs:smbd When reconnecting to server, call smbd_destroy() after all MIDs have been called longli
  2019-05-14  4:01 ` [PATCH 2/2] cifs:smbd Use the correct DMA direction when sending data longli
@ 2019-05-14 21:11 ` Pavel Shilovsky
  1 sibling, 0 replies; 5+ messages in thread
From: Pavel Shilovsky @ 2019-05-14 21:11 UTC (permalink / raw)
  To: Long Li; +Cc: Steve French, linux-cifs, samba-technical, Kernel Mailing List

пн, 13 мая 2019 г. в 21:02, <longli@linuxonhyperv.com>:
>
> From: Long Li <longli@microsoft.com>
>
> commit 214bab448476 ("cifs: Call MID callback before destroying transport")
> assumes that the MID callback should not take srv_mutex, this may not always
> be true. SMB Direct requires the MID callback completed before calling
> transport so all pending memory registration can be freed. So restore the
> orignal calling sequence so TCP transport will use the same code, but moving
> smbd_destroy() after all MID has been called.
>
> fixes: 214bab448476 ("cifs: Call MID callback before destroying transport")
> Signed-off-by: Long Li <longli@microsoft.com>
> ---
>  fs/cifs/connect.c | 37 ++++++++++++++++++++-----------------
>  1 file changed, 20 insertions(+), 17 deletions(-)
>
> diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
> index 084756cfdaee..0b3ac8b76d18 100644
> --- a/fs/cifs/connect.c
> +++ b/fs/cifs/connect.c
> @@ -528,6 +528,21 @@ cifs_reconnect(struct TCP_Server_Info *server)
>         /* do not want to be sending data on a socket we are freeing */
>         cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
>         mutex_lock(&server->srv_mutex);
> +       if (server->ssocket) {
> +               cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
> +                        server->ssocket->state, server->ssocket->flags);
> +               kernel_sock_shutdown(server->ssocket, SHUT_WR);
> +               cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
> +                        server->ssocket->state, server->ssocket->flags);
> +               sock_release(server->ssocket);
> +               server->ssocket = NULL;
> +       }
> +       server->sequence_number = 0;
> +       server->session_estab = false;
> +       kfree(server->session_key.response);
> +       server->session_key.response = NULL;
> +       server->session_key.len = 0;
> +       server->lstrp = jiffies;
>
>         /* mark submitted MIDs for retry and issue callback */
>         INIT_LIST_HEAD(&retry_list);
> @@ -540,6 +555,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
>                 list_move(&mid_entry->qhead, &retry_list);
>         }
>         spin_unlock(&GlobalMid_Lock);
> +       mutex_unlock(&server->srv_mutex);
>
>         cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
>         list_for_each_safe(tmp, tmp2, &retry_list) {
> @@ -548,24 +564,11 @@ cifs_reconnect(struct TCP_Server_Info *server)
>                 mid_entry->callback(mid_entry);
>         }
>
> -       if (server->ssocket) {
> -               cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
> -                        server->ssocket->state, server->ssocket->flags);
> -               kernel_sock_shutdown(server->ssocket, SHUT_WR);
> -               cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
> -                        server->ssocket->state, server->ssocket->flags);
> -               sock_release(server->ssocket);
> -               server->ssocket = NULL;
> -       } else if (cifs_rdma_enabled(server))
> +       if (cifs_rdma_enabled(server)) {
> +               mutex_lock(&server->srv_mutex);
>                 smbd_destroy(server);
> -       server->sequence_number = 0;
> -       server->session_estab = false;
> -       kfree(server->session_key.response);
> -       server->session_key.response = NULL;
> -       server->session_key.len = 0;
> -       server->lstrp = jiffies;
> -
> -       mutex_unlock(&server->srv_mutex);
> +               mutex_unlock(&server->srv_mutex);
> +       }
>
>         do {
>                 try_to_freeze();
> --
> 2.17.1
>

Thanks for quickly fixing it!

Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

--
Best regards,
Pavel Shilovsky

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH 2/2] cifs:smbd Use the correct DMA direction when sending data
  2019-05-14  4:01 ` [PATCH 2/2] cifs:smbd Use the correct DMA direction when sending data longli
@ 2019-05-14 21:41   ` Pavel Shilovsky
  2019-05-15  4:16   ` Steve French
  1 sibling, 0 replies; 5+ messages in thread
From: Pavel Shilovsky @ 2019-05-14 21:41 UTC (permalink / raw)
  To: Long Li; +Cc: Steve French, linux-cifs, samba-technical, Kernel Mailing List

пн, 13 мая 2019 г. в 21:02, <longli@linuxonhyperv.com>:
>
> From: Long Li <longli@microsoft.com>
>
> When sending data, use the DMA_TO_DEVICE to map buffers. Also log the number
> of requests in a compounding request from upper layer.
>
> Signed-off-by: Long Li <longli@microsoft.com>
> ---
>  fs/cifs/smbdirect.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
> index 251ef1223206..caac37b1de8c 100644
> --- a/fs/cifs/smbdirect.c
> +++ b/fs/cifs/smbdirect.c
> @@ -903,7 +903,7 @@ static int smbd_create_header(struct smbd_connection *info,
>         request->sge[0].addr = ib_dma_map_single(info->id->device,
>                                                  (void *)packet,
>                                                  header_length,
> -                                                DMA_BIDIRECTIONAL);
> +                                                DMA_TO_DEVICE);
>         if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) {
>                 mempool_free(request, info->request_mempool);
>                 rc = -EIO;
> @@ -1005,7 +1005,7 @@ static int smbd_post_send_sgl(struct smbd_connection *info,
>         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);
> +                              sg->offset, sg->length, DMA_TO_DEVICE);
>                 if (ib_dma_mapping_error(
>                                 info->id->device, request->sge[i+1].addr)) {
>                         rc = -EIO;
> @@ -2110,8 +2110,10 @@ int smbd_send(struct TCP_Server_Info *server,
>                 goto done;
>         }
>
> -       rqst_idx = 0;
> +       log_write(INFO, "num_rqst=%d total length=%u\n",
> +                       num_rqst, remaining_data_length);
>
> +       rqst_idx = 0;
>  next_rqst:
>         rqst = &rqst_array[rqst_idx];
>         iov = rqst->rq_iov;
> --
> 2.17.1
>

Acked-by: Pavel Shilovsky <pshilov@microsoft.com>

--
Best regards,
Pavel Shilovsky

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH 2/2] cifs:smbd Use the correct DMA direction when sending data
  2019-05-14  4:01 ` [PATCH 2/2] cifs:smbd Use the correct DMA direction when sending data longli
  2019-05-14 21:41   ` Pavel Shilovsky
@ 2019-05-15  4:16   ` Steve French
  1 sibling, 0 replies; 5+ messages in thread
From: Steve French @ 2019-05-15  4:16 UTC (permalink / raw)
  To: Long Li; +Cc: Steve French, CIFS, samba-technical, LKML

merged both patches into cifs-2.6.git for-next

On Mon, May 13, 2019 at 11:02 PM <longli@linuxonhyperv.com> wrote:
>
> From: Long Li <longli@microsoft.com>
>
> When sending data, use the DMA_TO_DEVICE to map buffers. Also log the number
> of requests in a compounding request from upper layer.
>
> Signed-off-by: Long Li <longli@microsoft.com>
> ---
>  fs/cifs/smbdirect.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
> index 251ef1223206..caac37b1de8c 100644
> --- a/fs/cifs/smbdirect.c
> +++ b/fs/cifs/smbdirect.c
> @@ -903,7 +903,7 @@ static int smbd_create_header(struct smbd_connection *info,
>         request->sge[0].addr = ib_dma_map_single(info->id->device,
>                                                  (void *)packet,
>                                                  header_length,
> -                                                DMA_BIDIRECTIONAL);
> +                                                DMA_TO_DEVICE);
>         if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) {
>                 mempool_free(request, info->request_mempool);
>                 rc = -EIO;
> @@ -1005,7 +1005,7 @@ static int smbd_post_send_sgl(struct smbd_connection *info,
>         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);
> +                              sg->offset, sg->length, DMA_TO_DEVICE);
>                 if (ib_dma_mapping_error(
>                                 info->id->device, request->sge[i+1].addr)) {
>                         rc = -EIO;
> @@ -2110,8 +2110,10 @@ int smbd_send(struct TCP_Server_Info *server,
>                 goto done;
>         }
>
> -       rqst_idx = 0;
> +       log_write(INFO, "num_rqst=%d total length=%u\n",
> +                       num_rqst, remaining_data_length);
>
> +       rqst_idx = 0;
>  next_rqst:
>         rqst = &rqst_array[rqst_idx];
>         iov = rqst->rq_iov;
> --
> 2.17.1
>


-- 
Thanks,

Steve

^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2019-05-15  4:16 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-05-14  4:01 [PATCH 1/2] cifs:smbd When reconnecting to server, call smbd_destroy() after all MIDs have been called longli
2019-05-14  4:01 ` [PATCH 2/2] cifs:smbd Use the correct DMA direction when sending data longli
2019-05-14 21:41   ` Pavel Shilovsky
2019-05-15  4:16   ` Steve French
2019-05-14 21:11 ` [PATCH 1/2] cifs:smbd When reconnecting to server, call smbd_destroy() after all MIDs have been called Pavel Shilovsky

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