9p: clean up packet dump code

Switch to generic kernel hexdump library and cleanup macros to
be more consistent with the way we do normal debug prints.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

include/net/9p/9p.h

@@ -40,6 +40,7 @@
  * @P9_DEBUG_FID: fid allocation/deallocation tracking
  * @P9_DEBUG_PKT: packet marshalling/unmarshalling
  * @P9_DEBUG_FSC: FS-cache tracing
+ * @P9_DEBUG_VPKT: Verbose packet debugging (full packet dump)
  *
  * These flags are passed at mount time to turn on various levels of
  * verbosity and tracing which will be output to the system logs.
@@ -57,6 +58,7 @@ enum p9_debug_flags {
 	P9_DEBUG_FID =		(1<<9),
 	P9_DEBUG_PKT =		(1<<10),
 	P9_DEBUG_FSC =		(1<<11),
+	P9_DEBUG_VPKT =		(1<<12),
 };
 
 #ifdef CONFIG_NET_9P_DEBUG
@@ -74,10 +76,14 @@ do {  \
 	} \
 } while (0)
 
+#define P9_DUMP_PKT(way, pdu) p9pdu_dump(way, pdu)
+
 #else
 #define P9_DPRINTK(level, format, arg...)  do { } while (0)
+#define P9_DUMP_PKT(way, pdu) do { } while (0)
 #endif
 
+
 #define P9_EPRINTK(level, format, arg...) \
 do { \
 	printk(level "9p: %s (%d): " \

net/9p/client.c

@@ -750,7 +750,7 @@ static int p9_client_version(struct p9_client *c)
 	err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
 	if (err) {
 		P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto error;
 	}
 
@@ -912,7 +912,7 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		p9_free_req(clnt, req);
 		goto error;
 	}
@@ -972,7 +972,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		p9_free_req(clnt, req);
 		goto clunk_fid;
 	}
@@ -1039,7 +1039,7 @@ int p9_client_open(struct p9_fid *fid, int mode)
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto free_and_error;
 	}
 
@@ -1082,7 +1082,7 @@ int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto free_and_error;
 	}
 
@@ -1127,7 +1127,7 @@ int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto free_and_error;
 	}
 
@@ -1166,7 +1166,7 @@ int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto free_and_error;
 	}
 
@@ -1319,11 +1319,12 @@ p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto free_and_error;
 	}
 
 	P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
+	P9_DUMP_PKT(1, req->rc);
 
 	if (!req->tc->pbuf_size) {
 		if (data) {
@@ -1387,7 +1388,7 @@ p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto free_and_error;
 	}
 
@@ -1427,7 +1428,7 @@ struct p9_wstat *p9_client_stat(struct p9_fid *fid)
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		p9_free_req(clnt, req);
 		goto error;
 	}
@@ -1478,7 +1479,7 @@ struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		p9_free_req(clnt, req);
 		goto error;
 	}
@@ -1626,7 +1627,7 @@ int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
 		&sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
 		&sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		p9_free_req(clnt, req);
 		goto error;
 	}
@@ -1702,7 +1703,7 @@ struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
 	}
 	err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		p9_free_req(clnt, req);
 		goto clunk_fid;
 	}
@@ -1781,7 +1782,7 @@ int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto free_and_error;
 	}
 
@@ -1818,7 +1819,7 @@ int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto error;
 	}
 	P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
@@ -1849,7 +1850,7 @@ int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto error;
 	}
 	P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
@@ -1884,7 +1885,7 @@ int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto error;
 	}
 	P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
@@ -1917,7 +1918,7 @@ int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
 			&glock->start, &glock->length, &glock->proc_id,
 			&glock->client_id);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto error;
 	}
 	P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
@@ -1945,7 +1946,7 @@ int p9_client_readlink(struct p9_fid *fid, char **target)
 
 	err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
 	if (err) {
-		p9pdu_dump(1, req->rc);
+		P9_DUMP_PKT(1, req->rc);
 		goto error;
 	}
 	P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);

net/9p/protocol.c

@@ -44,30 +44,24 @@ p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);
 void
 p9pdu_dump(int way, struct p9_fcall *pdu)
 {
-	int i, n;
-	u8 *data = pdu->sdata;
-	int datalen = pdu->size;
-	char buf[255];
-	int buflen = 255;
-
-	i = n = 0;
-	if (datalen > (buflen-16))
-		datalen = buflen-16;
-	while (i < datalen) {
-		n += scnprintf(buf + n, buflen - n, "%02x ", data[i]);
-		if (i%4 == 3)
-			n += scnprintf(buf + n, buflen - n, " ");
-		if (i%32 == 31)
-			n += scnprintf(buf + n, buflen - n, "\n");
-
-		i++;
+	int len = pdu->size;
+
+	if ((p9_debug_level & P9_DEBUG_VPKT) != P9_DEBUG_VPKT) {
+		if ((p9_debug_level & P9_DEBUG_PKT) == P9_DEBUG_PKT) {
+			if (len > 32)
+				len = 32;
+		} else {
+			/* shouldn't happen */
+			return;
+		}
 	}
-	n += scnprintf(buf + n, buflen - n, "\n");
 
 	if (way)
-		P9_DPRINTK(P9_DEBUG_PKT, "[[[(%d) %s\n", datalen, buf);
+		print_hex_dump_bytes("[9P] ", DUMP_PREFIX_OFFSET, pdu->sdata,
+									len);
 	else
-		P9_DPRINTK(P9_DEBUG_PKT, "]]](%d) %s\n", datalen, buf);
+		print_hex_dump_bytes("]9P[ ", DUMP_PREFIX_OFFSET, pdu->sdata,
+									len);
 }
 #else
 void
@@ -610,7 +604,7 @@ int p9stat_read(char *buf, int len, struct p9_wstat *st, int proto_version)
 	ret = p9pdu_readf(&fake_pdu, proto_version, "S", st);
 	if (ret) {
 		P9_DPRINTK(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret);
-		p9pdu_dump(1, &fake_pdu);
+		P9_DUMP_PKT(0, &fake_pdu);
 	}
 
 	return ret;
@@ -632,11 +626,7 @@ int p9pdu_finalize(struct p9_fcall *pdu)
 	err = p9pdu_writef(pdu, 0, "d", size);
 	pdu->size = size;
 
-#ifdef CONFIG_NET_9P_DEBUG
-	if ((p9_debug_level & P9_DEBUG_PKT) == P9_DEBUG_PKT)
-		p9pdu_dump(0, pdu);
-#endif
-
+	P9_DUMP_PKT(0, pdu);
 	P9_DPRINTK(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", pdu->size,
 							pdu->id, pdu->tag);
 
@@ -669,7 +659,7 @@ int p9dirent_read(char *buf, int len, struct p9_dirent *dirent,
 			&dirent->d_off, &dirent->d_type, &nameptr);
 	if (ret) {
 		P9_DPRINTK(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret);
-		p9pdu_dump(1, &fake_pdu);
+		P9_DUMP_PKT(1, &fake_pdu);
 		goto out;
 	}