cifs: Make big endian multiplex ID sequences monotonic on the wire

The multiplex identifier (MID) in the SMB header is only
ever used by the client, in conjunction with PID, to match responses
from the server. As such, the endianess of the MID is not important.
However, When tracing packet sequences on the wire, protocol analyzers
such as wireshark display MID as little endian. It is much more informative
for the on-the-wire MID sequences to match debug information emitted by the
CIFS driver. Therefore, one should write and read MID in the SMB header
assuming it is always little endian.

Observed from wireshark during the protocol negotiation
and session setup:

Multiplex ID: 256
Multiplex ID: 256
Multiplex ID: 512
Multiplex ID: 512
Multiplex ID: 768
Multiplex ID: 768

After this patch on-the-wire MID values begin at 1 and increase monotonically.

Introduce get_next_mid64() for the internal consumers that use the full 64 bit
multiplex identifier.

Introduce the helpers get_mid() and compare_mid() to make the endian
translation clear.

Reviewed-by: Jeff Layton <[e-mail]>
Signed-off-by: Tim Gardner <[e-mail]>
Signed-off-by: Steve French <[e-mail]>

fs/cifs/cifsglob.h

···
 }
 
 static inline __u64
-get_next_mid(struct TCP_Server_Info *server)
+get_next_mid64(struct TCP_Server_Info *server)
 {
 	return server->ops->get_next_mid(server);
+}
+
+static inline __le16
+get_next_mid(struct TCP_Server_Info *server)
+{
+	__u16 mid = get_next_mid64(server);
+	/*
+	 * The value in the SMB header should be little endian for easy
+	 * on-the-wire decoding.
+	 */
+	return cpu_to_le16(mid);
+}
+
+static inline __u16
+get_mid(const struct smb_hdr *smb)
+{
+	return le16_to_cpu(smb->Mid);
+}
+
+static inline bool
+compare_mid(__u16 mid, const struct smb_hdr *smb)
+{
+	return mid == le16_to_cpu(smb->Mid);
 }
 
 /*

fs/cifs/cifspdu.h

···
 	__u16 Tid;
 	__le16 Pid;
 	__u16 Uid;
-	__u16 Mid;
+	__le16 Mid;
 	__u8 WordCount;
 } __attribute__((packed));
 

fs/cifs/misc.c

···
 	if (smb->Command == SMB_COM_LOCKING_ANDX)
 		return 0;
 
-	cifs_dbg(VFS, "Server sent request, not response. mid=%u\n", smb->Mid);
+	cifs_dbg(VFS, "Server sent request, not response. mid=%u\n",
+		 get_mid(smb));
 	return 1;
 }
 
···
 	}
 
 	if (4 + rfclen != clc_len) {
+		__u16 mid = get_mid(smb);
 		/* check if bcc wrapped around for large read responses */
 		if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
 			/* check if lengths match mod 64K */
···
 				return 0; /* bcc wrapped */
 		}
 		cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n",
-			 clc_len, 4 + rfclen, smb->Mid);
+			 clc_len, 4 + rfclen, mid);
 
 		if (4 + rfclen < clc_len) {
 			cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n",
-				 rfclen, smb->Mid);
+				 rfclen, mid);
 			return -EIO;
 		} else if (rfclen > clc_len + 512) {
 			/*
···
 			 * data to 512 bytes.
 			 */
 			cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
-				 rfclen, smb->Mid);
+				 rfclen, mid);
 			return -EIO;
 		}
 	}

fs/cifs/smb1ops.c

···
 	mutex_unlock(&server->srv_mutex);
 
 	cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",
-		 in_buf->Mid, rc);
+		 get_mid(in_buf), rc);
 
 	return rc;
 }
···
 
 	spin_lock(&GlobalMid_Lock);
 	list_for_each_entry(mid, &server->pending_mid_q, qhead) {
-		if (mid->mid == buf->Mid &&
+		if (compare_mid(mid->mid, buf) &&
 		    mid->mid_state == MID_REQUEST_SUBMITTED &&
 		    le16_to_cpu(mid->command) == buf->Command) {
 			spin_unlock(&GlobalMid_Lock);

fs/cifs/smb2transport.c

···
 static inline void
 smb2_seq_num_into_buf(struct TCP_Server_Info *server, struct smb2_hdr *hdr)
 {
-	hdr->MessageId = get_next_mid(server);
+	hdr->MessageId = get_next_mid64(server);
 }
 
 static struct mid_q_entry *

fs/cifs/transport.c

···
 		return temp;
 	else {
 		memset(temp, 0, sizeof(struct mid_q_entry));
-		temp->mid = smb_buffer->Mid;	/* always LE */
+		temp->mid = get_mid(smb_buffer);
 		temp->pid = current->pid;
 		temp->command = cpu_to_le16(smb_buffer->Command);
 		cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command);