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authorLong Li <longli@microsoft.com>2020-03-26 19:42:24 -0700
committerSteve French <stfrench@microsoft.com>2020-03-29 16:41:49 -0500
commitf7950cb05d060b00db5e6102261417cef26c5789 (patch)
treeee1829a8b037ae57a705bb4bfceee416768acf9a /fs/cifs
parentedad734c74a4ab6ba8531186054779b2382df3fd (diff)
cifs: smbd: Calculate the correct maximum packet size for segmented SMBDirect send/receive
The packet size needs to take account of SMB2 header size and possible encryption header size. This is only done when signing is used and it is for RDMA send/receive, not read/write. Also remove the dead SMBD code in smb2_negotiate_r(w)size. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/smb2ops.c38
-rw-r--r--fs/cifs/smb2pdu.h3
-rw-r--r--fs/cifs/smbdirect.c3
3 files changed, 20 insertions, 24 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 9c9258fc8756..b36c46f48705 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -328,16 +328,6 @@ smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
/* start with specified wsize, or default */
wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
wsize = min_t(unsigned int, wsize, server->max_write);
-#ifdef CONFIG_CIFS_SMB_DIRECT
- if (server->rdma) {
- if (server->sign)
- wsize = min_t(unsigned int,
- wsize, server->smbd_conn->max_fragmented_send_size);
- else
- wsize = min_t(unsigned int,
- wsize, server->smbd_conn->max_readwrite_size);
- }
-#endif
if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
@@ -356,8 +346,15 @@ smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
#ifdef CONFIG_CIFS_SMB_DIRECT
if (server->rdma) {
if (server->sign)
+ /*
+ * Account for SMB2 data transfer packet header and
+ * possible encryption header
+ */
wsize = min_t(unsigned int,
- wsize, server->smbd_conn->max_fragmented_send_size);
+ wsize,
+ server->smbd_conn->max_fragmented_send_size -
+ SMB2_READWRITE_PDU_HEADER_SIZE -
+ sizeof(struct smb2_transform_hdr));
else
wsize = min_t(unsigned int,
wsize, server->smbd_conn->max_readwrite_size);
@@ -378,16 +375,6 @@ smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
/* start with specified rsize, or default */
rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
rsize = min_t(unsigned int, rsize, server->max_read);
-#ifdef CONFIG_CIFS_SMB_DIRECT
- if (server->rdma) {
- if (server->sign)
- rsize = min_t(unsigned int,
- rsize, server->smbd_conn->max_fragmented_recv_size);
- else
- rsize = min_t(unsigned int,
- rsize, server->smbd_conn->max_readwrite_size);
- }
-#endif
if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
@@ -407,8 +394,15 @@ smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
#ifdef CONFIG_CIFS_SMB_DIRECT
if (server->rdma) {
if (server->sign)
+ /*
+ * Account for SMB2 data transfer packet header and
+ * possible encryption header
+ */
rsize = min_t(unsigned int,
- rsize, server->smbd_conn->max_fragmented_recv_size);
+ rsize,
+ server->smbd_conn->max_fragmented_recv_size -
+ SMB2_READWRITE_PDU_HEADER_SIZE -
+ sizeof(struct smb2_transform_hdr));
else
rsize = min_t(unsigned int,
rsize, server->smbd_conn->max_readwrite_size);
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index dda928d05c13..10acf90f858d 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -120,6 +120,9 @@ struct smb2_sync_hdr {
__u8 Signature[16];
} __packed;
+/* The total header size for SMB2 read and write */
+#define SMB2_READWRITE_PDU_HEADER_SIZE (48 + sizeof(struct smb2_sync_hdr))
+
struct smb2_sync_pdu {
struct smb2_sync_hdr sync_hdr;
__le16 StructureSize2; /* size of wct area (varies, request specific) */
diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 5b1b97e9e0c9..a6ae29b3c4e7 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -2097,8 +2097,7 @@ int smbd_send(struct TCP_Server_Info *server,
for (i = 0; i < num_rqst; i++)
remaining_data_length += smb_rqst_len(server, &rqst_array[i]);
- if (remaining_data_length + sizeof(struct smbd_data_transfer) >
- info->max_fragmented_send_size) {
+ if (remaining_data_length > info->max_fragmented_send_size) {
log_write(ERR, "payload size %d > max size %d\n",
remaining_data_length, info->max_fragmented_send_size);
rc = -EINVAL;