[PATCH v2 net-next 00/14] Make DSA tag drivers kernel modules

[PATCH v2 net-next 00/14] Make DSA tag drivers kernel modules

[Andrew Lunn]

istorically, DSA tag drivers have been compiled into the kernel as
part of the DSA core. With the growing number of tag drivers, it makes
sense to allow this driver code to be compiled as a module, and loaded
on demand.

v2
--
Move name to end of structure, keeping the hot entries at the beginning.
More tag protocol to end of structure to keep hot members at the beginning.
Fix indent of #endif
Rewrite to move list pointer into a new structure
void functions, since there cannot be errors
Fix fall-through comment
Reorder patch for unused symbols to before tag drivers can be modules
tab/space cleanup
Help text wording
NET_DSA_TAG_BRCM_COMMON and NET_DSA_TAG_KZS_COMMON hidden


Andrew Lunn (14):
  dsa: Add SPDX header to tag drivers.
  dsa: Move tagger name into its ops structure
  dsa: Add MODULE_ALIAS to taggers in preparation to become modules
  dsa: Add MODULE_LICENSE to tag drivers
  dsa: Add TAG protocol to tag ops
  dsa: Add boilerplate helper to register DSA tag driver modules
  dsa: Keep link list of tag drivers
  dsa: Register the none tagger ops
  dsa: Rename dsa_resolve_tag_protocol() to _get ready for locking
  dsa: Add stub tag driver put method
  dsa: Make use of the list of tag drivers
  dsa: Cleanup unneeded table and make tag structures static
  dsa: tag_brcm: Avoid unused symbols
  dsa: Allow tag drivers to be built as modules

 include/net/dsa.h     | 110 ++++++++++++++++++++++++----
 net/dsa/Kconfig       |  83 ++++++++++++++++-----
 net/dsa/Makefile      |  19 +++--
 net/dsa/dsa.c         | 165 ++++++++++++++++++++++--------------------
 net/dsa/dsa2.c        |   4 +-
 net/dsa/dsa_priv.h    |  34 +--------
 net/dsa/legacy.c      |   4 +-
 net/dsa/tag_brcm.c    |  41 ++++++++---
 net/dsa/tag_dsa.c     |  15 ++--
 net/dsa/tag_edsa.c    |  15 ++--
 net/dsa/tag_gswip.c   |   9 ++-
 net/dsa/tag_ksz.c     |  29 ++++++--
 net/dsa/tag_lan9303.c |  20 +++--
 net/dsa/tag_mtk.c     |  18 ++---
 net/dsa/tag_qca.c     |  19 +++--
 net/dsa/tag_trailer.c |  15 ++--
 16 files changed, 380 insertions(+), 220 deletions(-)

-- 
2.20.1

[PATCH v2 net-next 01/14] dsa: Add SPDX header to tag drivers.

[Andrew Lunn]

Add an SPDX header, and remove the license boilerplate text.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
 net/dsa/tag_brcm.c    |  6 +-----
 net/dsa/tag_dsa.c     |  6 +-----
 net/dsa/tag_edsa.c    |  6 +-----
 net/dsa/tag_ksz.c     |  6 +-----
 net/dsa/tag_lan9303.c | 11 +----------
 net/dsa/tag_mtk.c     |  9 +--------
 net/dsa/tag_qca.c     | 10 +---------
 net/dsa/tag_trailer.c |  6 +-----
 8 files changed, 8 insertions(+), 52 deletions(-)

diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index 4aa1d368a5ae..b3063e7adb73 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -1,12 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Broadcom tag support
  *
  * Copyright (C) 2014 Broadcom Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include <linux/etherdevice.h>
diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
index 67ff3fae18d8..fdaf850831e2 100644
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -1,11 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * net/dsa/tag_dsa.c - (Non-ethertype) DSA tagging
  * Copyright (c) 2008-2009 Marvell Semiconductor
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include <linux/etherdevice.h>
diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c
index 234585ec116e..df879445f658 100644
--- a/net/dsa/tag_edsa.c
+++ b/net/dsa/tag_edsa.c
@@ -1,11 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * net/dsa/tag_edsa.c - Ethertype DSA tagging
  * Copyright (c) 2008-2009 Marvell Semiconductor
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include <linux/etherdevice.h>
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index de246c93d3bb..12b2f58786ee 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -1,11 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * net/dsa/tag_ksz.c - Microchip KSZ Switch tag format handling
  * Copyright (c) 2017 Microchip Technology
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include <linux/etherdevice.h>
diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index f48889e46ff7..7bfd3165e46e 100644
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -1,15 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2017 Pengutronix, Juergen Borleis <jbe@pengutronix.de>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
  */
 #include <linux/dsa/lan9303.h>
 #include <linux/etherdevice.h>
diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
index f39f4dfeda34..6e06fa621bbc 100644
--- a/net/dsa/tag_mtk.c
+++ b/net/dsa/tag_mtk.c
@@ -1,15 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Mediatek DSA Tag support
  * Copyright (C) 2017 Landen Chao <landen.chao@mediatek.com>
  *		      Sean Wang <sean.wang@mediatek.com>
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 #include <linux/etherdevice.h>
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index 85c22ada4744..de3eb1022e21 100644
--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -1,14 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 #include <linux/etherdevice.h>
diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
index b40756ed6e57..492a30046281 100644
--- a/net/dsa/tag_trailer.c
+++ b/net/dsa/tag_trailer.c
@@ -1,11 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * net/dsa/tag_trailer.c - Trailer tag format handling
  * Copyright (c) 2008-2009 Marvell Semiconductor
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include <linux/etherdevice.h>
-- 
2.20.1

[PATCH v2 net-next 02/14] dsa: Move tagger name into its ops structure

[Andrew Lunn]

Rather than keep a list to map a tagger ops to a name, place the name
into the ops structure. This removes the hard coded list, a step
towards making the taggers more dynamic.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

v2:
Move name to end of structure, keeping the hot entries at the beginning.
---
 include/net/dsa.h     |  1 +
 net/dsa/dsa.c         | 45 ++-----------------------------------------
 net/dsa/tag_brcm.c    |  2 ++
 net/dsa/tag_dsa.c     |  1 +
 net/dsa/tag_edsa.c    |  1 +
 net/dsa/tag_gswip.c   |  1 +
 net/dsa/tag_ksz.c     |  2 ++
 net/dsa/tag_lan9303.c |  1 +
 net/dsa/tag_mtk.c     |  1 +
 net/dsa/tag_qca.c     |  1 +
 net/dsa/tag_trailer.c |  1 +
 11 files changed, 14 insertions(+), 43 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 0cfc2f828b87..801346e31e9b 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -56,6 +56,7 @@ struct dsa_device_ops {
 	int (*flow_dissect)(const struct sk_buff *skb, __be16 *proto,
 			    int *offset);
 	unsigned int overhead;
+	const char *name;
 };
 
 struct dsa_switch_tree {
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 36de4f2a3366..92b3cd129eb7 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -35,6 +35,7 @@ static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 }
 
 static const struct dsa_device_ops none_ops = {
+	.name	= "none",
 	.xmit	= dsa_slave_notag_xmit,
 	.rcv	= NULL,
 };
@@ -76,49 +77,7 @@ const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
 
 const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
 {
-	const char *protocol_name[DSA_TAG_LAST] = {
-#ifdef CONFIG_NET_DSA_TAG_BRCM
-		[DSA_TAG_PROTO_BRCM] = "brcm",
-#endif
-#ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND
-		[DSA_TAG_PROTO_BRCM_PREPEND] = "brcm-prepend",
-#endif
-#ifdef CONFIG_NET_DSA_TAG_DSA
-		[DSA_TAG_PROTO_DSA] = "dsa",
-#endif
-#ifdef CONFIG_NET_DSA_TAG_EDSA
-		[DSA_TAG_PROTO_EDSA] = "edsa",
-#endif
-#ifdef CONFIG_NET_DSA_TAG_GSWIP
-		[DSA_TAG_PROTO_GSWIP] = "gswip",
-#endif
-#ifdef CONFIG_NET_DSA_TAG_KSZ9477
-		[DSA_TAG_PROTO_KSZ9477] = "ksz9477",
-		[DSA_TAG_PROTO_KSZ9893] = "ksz9893",
-#endif
-#ifdef CONFIG_NET_DSA_TAG_LAN9303
-		[DSA_TAG_PROTO_LAN9303] = "lan9303",
-#endif
-#ifdef CONFIG_NET_DSA_TAG_MTK
-		[DSA_TAG_PROTO_MTK] = "mtk",
-#endif
-#ifdef CONFIG_NET_DSA_TAG_QCA
-		[DSA_TAG_PROTO_QCA] = "qca",
-#endif
-#ifdef CONFIG_NET_DSA_TAG_TRAILER
-		[DSA_TAG_PROTO_TRAILER] = "trailer",
-#endif
-		[DSA_TAG_PROTO_NONE] = "none",
-	};
-	unsigned int i;
-
-	BUILD_BUG_ON(ARRAY_SIZE(protocol_name) != DSA_TAG_LAST);
-
-	for (i = 0; i < ARRAY_SIZE(dsa_device_ops); i++)
-		if (ops == dsa_device_ops[i])
-			return protocol_name[i];
-
-	return protocol_name[DSA_TAG_PROTO_NONE];
+	return ops->name;
 };
 
 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index b3063e7adb73..1b7dfbe6b3ae 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -168,6 +168,7 @@ static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 }
 
 const struct dsa_device_ops brcm_netdev_ops = {
+	.name	= "brcm",
 	.xmit	= brcm_tag_xmit,
 	.rcv	= brcm_tag_rcv,
 	.overhead = BRCM_TAG_LEN,
@@ -191,6 +192,7 @@ static struct sk_buff *brcm_tag_rcv_prepend(struct sk_buff *skb,
 }
 
 const struct dsa_device_ops brcm_prepend_netdev_ops = {
+	.name	= "brcm-prepend",
 	.xmit	= brcm_tag_xmit_prepend,
 	.rcv	= brcm_tag_rcv_prepend,
 	.overhead = BRCM_TAG_LEN,
diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
index fdaf850831e2..e1c90709de6c 100644
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -151,6 +151,7 @@ static int dsa_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 }
 
 const struct dsa_device_ops dsa_netdev_ops = {
+	.name	= "dsa",
 	.xmit	= dsa_xmit,
 	.rcv	= dsa_rcv,
 	.flow_dissect   = dsa_tag_flow_dissect,
diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c
index df879445f658..b936b4660b71 100644
--- a/net/dsa/tag_edsa.c
+++ b/net/dsa/tag_edsa.c
@@ -170,6 +170,7 @@ static int edsa_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 }
 
 const struct dsa_device_ops edsa_netdev_ops = {
+	.name	= "edsa",
 	.xmit	= edsa_xmit,
 	.rcv	= edsa_rcv,
 	.flow_dissect   = edsa_tag_flow_dissect,
diff --git a/net/dsa/tag_gswip.c b/net/dsa/tag_gswip.c
index cb6f82ffe5eb..d1c1e7db87b6 100644
--- a/net/dsa/tag_gswip.c
+++ b/net/dsa/tag_gswip.c
@@ -104,6 +104,7 @@ static struct sk_buff *gswip_tag_rcv(struct sk_buff *skb,
 }
 
 const struct dsa_device_ops gswip_netdev_ops = {
+	.name = "gwsip",
 	.xmit = gswip_tag_xmit,
 	.rcv = gswip_tag_rcv,
 	.overhead = GSWIP_RX_HEADER_LEN,
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 12b2f58786ee..631094599514 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -134,6 +134,7 @@ static struct sk_buff *ksz9477_rcv(struct sk_buff *skb, struct net_device *dev,
 }
 
 const struct dsa_device_ops ksz9477_netdev_ops = {
+	.name	= "ksz9477",
 	.xmit	= ksz9477_xmit,
 	.rcv	= ksz9477_rcv,
 	.overhead = KSZ9477_INGRESS_TAG_LEN,
@@ -167,6 +168,7 @@ static struct sk_buff *ksz9893_xmit(struct sk_buff *skb,
 }
 
 const struct dsa_device_ops ksz9893_netdev_ops = {
+	.name	= "ksz9893",
 	.xmit	= ksz9893_xmit,
 	.rcv	= ksz9477_rcv,
 	.overhead = KSZ_INGRESS_TAG_LEN,
diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index 7bfd3165e46e..67d70339536d 100644
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -129,6 +129,7 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
 }
 
 const struct dsa_device_ops lan9303_netdev_ops = {
+	.name = "lan9303",
 	.xmit = lan9303_xmit,
 	.rcv = lan9303_rcv,
 	.overhead = LAN9303_TAG_LEN,
diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
index 6e06fa621bbc..dc537d9a18c0 100644
--- a/net/dsa/tag_mtk.c
+++ b/net/dsa/tag_mtk.c
@@ -99,6 +99,7 @@ static int mtk_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 }
 
 const struct dsa_device_ops mtk_netdev_ops = {
+	.name		= "mtk",
 	.xmit		= mtk_tag_xmit,
 	.rcv		= mtk_tag_rcv,
 	.flow_dissect	= mtk_tag_flow_dissect,
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index de3eb1022e21..f62296ffc5b7 100644
--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -100,6 +100,7 @@ static int qca_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 }
 
 const struct dsa_device_ops qca_netdev_ops = {
+	.name	= "qca",
 	.xmit	= qca_tag_xmit,
 	.rcv	= qca_tag_rcv,
 	.flow_dissect = qca_tag_flow_dissect,
diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
index 492a30046281..20ee7f84fe4d 100644
--- a/net/dsa/tag_trailer.c
+++ b/net/dsa/tag_trailer.c
@@ -78,6 +78,7 @@ static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev,
 }
 
 const struct dsa_device_ops trailer_netdev_ops = {
+	.name	= "trailer",
 	.xmit	= trailer_xmit,
 	.rcv	= trailer_rcv,
 	.overhead = 4,
-- 
2.20.1

[PATCH v2 net-next 03/14] dsa: Add MODULE_ALIAS to taggers in preparation to become modules

[Andrew Lunn]

When the tag drivers become modules, we will need to dynamically load
them based on what the switch drivers need. Add aliases to map between
the TAG protocol and the driver.

In order to do this, we need the tag protocol number as something
which the C pre-processor can stringinfy. Only the compiler knows the
value of an enum, CPP cannot use them. So add #defines.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
 include/net/dsa.h     | 43 ++++++++++++++++++++++++++++++-------------
 net/dsa/tag_brcm.c    |  4 ++++
 net/dsa/tag_dsa.c     |  2 ++
 net/dsa/tag_edsa.c    |  2 ++
 net/dsa/tag_gswip.c   |  2 ++
 net/dsa/tag_ksz.c     |  4 ++++
 net/dsa/tag_lan9303.c |  2 ++
 net/dsa/tag_mtk.c     |  2 ++
 net/dsa/tag_qca.c     |  2 ++
 net/dsa/tag_trailer.c |  2 ++
 10 files changed, 52 insertions(+), 13 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 801346e31e9b..8f3d5e0825a2 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -30,20 +30,33 @@ struct phy_device;
 struct fixed_phy_status;
 struct phylink_link_state;
 
+#define DSA_TAG_PROTO_NONE_VALUE		0
+#define DSA_TAG_PROTO_BRCM_VALUE		1
+#define DSA_TAG_PROTO_BRCM_PREPEND_VALUE	2
+#define DSA_TAG_PROTO_DSA_VALUE			3
+#define DSA_TAG_PROTO_EDSA_VALUE		4
+#define DSA_TAG_PROTO_GSWIP_VALUE		5
+#define DSA_TAG_PROTO_KSZ9477_VALUE		6
+#define DSA_TAG_PROTO_KSZ9893_VALUE		7
+#define DSA_TAG_PROTO_LAN9303_VALUE		8
+#define DSA_TAG_PROTO_MTK_VALUE			9
+#define DSA_TAG_PROTO_QCA_VALUE			10
+#define DSA_TAG_PROTO_TRAILER_VALUE		11
+
 enum dsa_tag_protocol {
-	DSA_TAG_PROTO_NONE = 0,
-	DSA_TAG_PROTO_BRCM,
-	DSA_TAG_PROTO_BRCM_PREPEND,
-	DSA_TAG_PROTO_DSA,
-	DSA_TAG_PROTO_EDSA,
-	DSA_TAG_PROTO_GSWIP,
-	DSA_TAG_PROTO_KSZ9477,
-	DSA_TAG_PROTO_KSZ9893,
-	DSA_TAG_PROTO_LAN9303,
-	DSA_TAG_PROTO_MTK,
-	DSA_TAG_PROTO_QCA,
-	DSA_TAG_PROTO_TRAILER,
-	DSA_TAG_LAST,		/* MUST BE LAST */
+	DSA_TAG_PROTO_NONE		= DSA_TAG_PROTO_NONE_VALUE,
+	DSA_TAG_PROTO_BRCM		= DSA_TAG_PROTO_BRCM_VALUE,
+	DSA_TAG_PROTO_BRCM_PREPEND	= DSA_TAG_PROTO_BRCM_PREPEND_VALUE,
+	DSA_TAG_PROTO_DSA		= DSA_TAG_PROTO_DSA_VALUE,
+	DSA_TAG_PROTO_EDSA		= DSA_TAG_PROTO_EDSA_VALUE,
+	DSA_TAG_PROTO_GSWIP		= DSA_TAG_PROTO_GSWIP_VALUE,
+	DSA_TAG_PROTO_KSZ9477		= DSA_TAG_PROTO_KSZ9477_VALUE,
+	DSA_TAG_PROTO_KSZ9893		= DSA_TAG_PROTO_KSZ9893_VALUE,
+	DSA_TAG_PROTO_LAN9303		= DSA_TAG_PROTO_LAN9303_VALUE,
+	DSA_TAG_PROTO_MTK		= DSA_TAG_PROTO_MTK_VALUE,
+	DSA_TAG_PROTO_QCA		= DSA_TAG_PROTO_QCA_VALUE,
+	DSA_TAG_PROTO_TRAILER		= DSA_TAG_PROTO_TRAILER_VALUE,
+	DSA_TAG_LAST,			/* MUST BE LAST */
 };
 
 struct packet_type;
@@ -59,6 +72,10 @@ struct dsa_device_ops {
 	const char *name;
 };
 
+#define DSA_TAG_DRIVER_ALIAS "dsa_tag-"
+#define MODULE_ALIAS_DSA_TAG_DRIVER(__proto)				\
+	MODULE_ALIAS(DSA_TAG_DRIVER_ALIAS __stringify(__proto##_VALUE))
+
 struct dsa_switch_tree {
 	struct list_head	list;
 
diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index 1b7dfbe6b3ae..24d8f45a7e6f 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -173,6 +173,8 @@ const struct dsa_device_ops brcm_netdev_ops = {
 	.rcv	= brcm_tag_rcv,
 	.overhead = BRCM_TAG_LEN,
 };
+
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_BRCM);
 #endif
 
 #ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND
@@ -198,3 +200,5 @@ const struct dsa_device_ops brcm_prepend_netdev_ops = {
 	.overhead = BRCM_TAG_LEN,
 };
 #endif
+
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_BRCM_PREPEND);
diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
index e1c90709de6c..8aefaf96c1ca 100644
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -157,3 +157,5 @@ const struct dsa_device_ops dsa_netdev_ops = {
 	.flow_dissect   = dsa_tag_flow_dissect,
 	.overhead = DSA_HLEN,
 };
+
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_DSA);
diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c
index b936b4660b71..bad12e760f3d 100644
--- a/net/dsa/tag_edsa.c
+++ b/net/dsa/tag_edsa.c
@@ -176,3 +176,5 @@ const struct dsa_device_ops edsa_netdev_ops = {
 	.flow_dissect   = edsa_tag_flow_dissect,
 	.overhead = EDSA_HLEN,
 };
+
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_EDSA);
diff --git a/net/dsa/tag_gswip.c b/net/dsa/tag_gswip.c
index d1c1e7db87b6..30bf7036620f 100644
--- a/net/dsa/tag_gswip.c
+++ b/net/dsa/tag_gswip.c
@@ -109,3 +109,5 @@ const struct dsa_device_ops gswip_netdev_ops = {
 	.rcv = gswip_tag_rcv,
 	.overhead = GSWIP_RX_HEADER_LEN,
 };
+
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_GSWIP);
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 631094599514..9be0f5f12afb 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -140,6 +140,8 @@ const struct dsa_device_ops ksz9477_netdev_ops = {
 	.overhead = KSZ9477_INGRESS_TAG_LEN,
 };
 
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9477);
+
 #define KSZ9893_TAIL_TAG_OVERRIDE	BIT(5)
 #define KSZ9893_TAIL_TAG_LOOKUP		BIT(6)
 
@@ -173,3 +175,5 @@ const struct dsa_device_ops ksz9893_netdev_ops = {
 	.rcv	= ksz9477_rcv,
 	.overhead = KSZ_INGRESS_TAG_LEN,
 };
+
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9893);
diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index 67d70339536d..48bca20024d4 100644
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -134,3 +134,5 @@ const struct dsa_device_ops lan9303_netdev_ops = {
 	.rcv = lan9303_rcv,
 	.overhead = LAN9303_TAG_LEN,
 };
+
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_LAN9303);
diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
index dc537d9a18c0..23210a65cbed 100644
--- a/net/dsa/tag_mtk.c
+++ b/net/dsa/tag_mtk.c
@@ -105,3 +105,5 @@ const struct dsa_device_ops mtk_netdev_ops = {
 	.flow_dissect	= mtk_tag_flow_dissect,
 	.overhead	= MTK_HDR_LEN,
 };
+
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_MTK);
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index f62296ffc5b7..7d9cb178da3d 100644
--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -106,3 +106,5 @@ const struct dsa_device_ops qca_netdev_ops = {
 	.flow_dissect = qca_tag_flow_dissect,
 	.overhead = QCA_HDR_LEN,
 };
+
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA);
diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
index 20ee7f84fe4d..00d521cf9c48 100644
--- a/net/dsa/tag_trailer.c
+++ b/net/dsa/tag_trailer.c
@@ -83,3 +83,5 @@ const struct dsa_device_ops trailer_netdev_ops = {
 	.rcv	= trailer_rcv,
 	.overhead = 4,
 };
+
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_TRAILER);
-- 
2.20.1

[PATCH v2 net-next 04/14] dsa: Add MODULE_LICENSE to tag drivers

[Andrew Lunn]

All the tag drivers are some variant of GPL. Add a MODULE_LICENSE()
indicating this, so the drivers can later be compiled as modules.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
 net/dsa/tag_brcm.c    | 1 +
 net/dsa/tag_dsa.c     | 1 +
 net/dsa/tag_edsa.c    | 1 +
 net/dsa/tag_gswip.c   | 1 +
 net/dsa/tag_ksz.c     | 1 +
 net/dsa/tag_lan9303.c | 1 +
 net/dsa/tag_mtk.c     | 1 +
 net/dsa/tag_qca.c     | 1 +
 net/dsa/tag_trailer.c | 1 +
 9 files changed, 9 insertions(+)

diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index 24d8f45a7e6f..59421f9e96de 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -201,4 +201,5 @@ const struct dsa_device_ops brcm_prepend_netdev_ops = {
 };
 #endif
 
+MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_BRCM_PREPEND);
diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
index 8aefaf96c1ca..b8f3236db877 100644
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -158,4 +158,5 @@ const struct dsa_device_ops dsa_netdev_ops = {
 	.overhead = DSA_HLEN,
 };
 
+MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_DSA);
diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c
index bad12e760f3d..c4fddf7292cf 100644
--- a/net/dsa/tag_edsa.c
+++ b/net/dsa/tag_edsa.c
@@ -177,4 +177,5 @@ const struct dsa_device_ops edsa_netdev_ops = {
 	.overhead = EDSA_HLEN,
 };
 
+MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_EDSA);
diff --git a/net/dsa/tag_gswip.c b/net/dsa/tag_gswip.c
index 30bf7036620f..6a7ff063b6e0 100644
--- a/net/dsa/tag_gswip.c
+++ b/net/dsa/tag_gswip.c
@@ -110,4 +110,5 @@ const struct dsa_device_ops gswip_netdev_ops = {
 	.overhead = GSWIP_RX_HEADER_LEN,
 };
 
+MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_GSWIP);
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 9be0f5f12afb..6d78d88270fc 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -176,4 +176,5 @@ const struct dsa_device_ops ksz9893_netdev_ops = {
 	.overhead = KSZ_INGRESS_TAG_LEN,
 };
 
+MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9893);
diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index 48bca20024d4..1f5819e4e687 100644
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -135,4 +135,5 @@ const struct dsa_device_ops lan9303_netdev_ops = {
 	.overhead = LAN9303_TAG_LEN,
 };
 
+MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_LAN9303);
diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
index 23210a65cbed..7ecafb569f74 100644
--- a/net/dsa/tag_mtk.c
+++ b/net/dsa/tag_mtk.c
@@ -106,4 +106,5 @@ const struct dsa_device_ops mtk_netdev_ops = {
 	.overhead	= MTK_HDR_LEN,
 };
 
+MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_MTK);
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index 7d9cb178da3d..f3fdeafef1fe 100644
--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -107,4 +107,5 @@ const struct dsa_device_ops qca_netdev_ops = {
 	.overhead = QCA_HDR_LEN,
 };
 
+MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA);
diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
index 00d521cf9c48..9ec6aa7938cc 100644
--- a/net/dsa/tag_trailer.c
+++ b/net/dsa/tag_trailer.c
@@ -84,4 +84,5 @@ const struct dsa_device_ops trailer_netdev_ops = {
 	.overhead = 4,
 };
 
+MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_TRAILER);
-- 
2.20.1

[PATCH v2 net-next 05/14] dsa: Add TAG protocol to tag ops

[Andrew Lunn]

In order that we can match the tagging protocol a switch driver
request to the tagger, we need to know what protocol the tagger
supports. Add this information to the ops structure.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

v2
More tag protocol to end of structure to keep hot members at the beginning.
---
 include/net/dsa.h     | 1 +
 net/dsa/dsa.c         | 1 +
 net/dsa/tag_brcm.c    | 2 ++
 net/dsa/tag_dsa.c     | 1 +
 net/dsa/tag_edsa.c    | 1 +
 net/dsa/tag_gswip.c   | 1 +
 net/dsa/tag_ksz.c     | 2 ++
 net/dsa/tag_lan9303.c | 1 +
 net/dsa/tag_mtk.c     | 1 +
 net/dsa/tag_qca.c     | 1 +
 net/dsa/tag_trailer.c | 1 +
 11 files changed, 13 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 8f3d5e0825a2..720036f48fb3 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -70,6 +70,7 @@ struct dsa_device_ops {
 			    int *offset);
 	unsigned int overhead;
 	const char *name;
+	enum dsa_tag_protocol proto;
 };
 
 #define DSA_TAG_DRIVER_ALIAS "dsa_tag-"
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 92b3cd129eb7..2da733dff86b 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -36,6 +36,7 @@ static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 
 static const struct dsa_device_ops none_ops = {
 	.name	= "none",
+	.proto	= DSA_TAG_PROTO_NONE,
 	.xmit	= dsa_slave_notag_xmit,
 	.rcv	= NULL,
 };
diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index 59421f9e96de..39b380485e5a 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -169,6 +169,7 @@ static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 
 const struct dsa_device_ops brcm_netdev_ops = {
 	.name	= "brcm",
+	.proto	= DSA_TAG_PROTO_BRCM,
 	.xmit	= brcm_tag_xmit,
 	.rcv	= brcm_tag_rcv,
 	.overhead = BRCM_TAG_LEN,
@@ -195,6 +196,7 @@ static struct sk_buff *brcm_tag_rcv_prepend(struct sk_buff *skb,
 
 const struct dsa_device_ops brcm_prepend_netdev_ops = {
 	.name	= "brcm-prepend",
+	.proto	= DSA_TAG_PROTO_BRCM_PREPEND,
 	.xmit	= brcm_tag_xmit_prepend,
 	.rcv	= brcm_tag_rcv_prepend,
 	.overhead = BRCM_TAG_LEN,
diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
index b8f3236db877..ec9b66c11219 100644
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -152,6 +152,7 @@ static int dsa_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 
 const struct dsa_device_ops dsa_netdev_ops = {
 	.name	= "dsa",
+	.proto	= DSA_TAG_PROTO_DSA,
 	.xmit	= dsa_xmit,
 	.rcv	= dsa_rcv,
 	.flow_dissect   = dsa_tag_flow_dissect,
diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c
index c4fddf7292cf..866d4e684511 100644
--- a/net/dsa/tag_edsa.c
+++ b/net/dsa/tag_edsa.c
@@ -171,6 +171,7 @@ static int edsa_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 
 const struct dsa_device_ops edsa_netdev_ops = {
 	.name	= "edsa",
+	.proto	= DSA_TAG_PROTO_EDSA,
 	.xmit	= edsa_xmit,
 	.rcv	= edsa_rcv,
 	.flow_dissect   = edsa_tag_flow_dissect,
diff --git a/net/dsa/tag_gswip.c b/net/dsa/tag_gswip.c
index 6a7ff063b6e0..192156373108 100644
--- a/net/dsa/tag_gswip.c
+++ b/net/dsa/tag_gswip.c
@@ -105,6 +105,7 @@ static struct sk_buff *gswip_tag_rcv(struct sk_buff *skb,
 
 const struct dsa_device_ops gswip_netdev_ops = {
 	.name = "gwsip",
+	.proto	= DSA_TAG_PROTO_GSWIP,
 	.xmit = gswip_tag_xmit,
 	.rcv = gswip_tag_rcv,
 	.overhead = GSWIP_RX_HEADER_LEN,
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 6d78d88270fc..5f5c8f9a6141 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -135,6 +135,7 @@ static struct sk_buff *ksz9477_rcv(struct sk_buff *skb, struct net_device *dev,
 
 const struct dsa_device_ops ksz9477_netdev_ops = {
 	.name	= "ksz9477",
+	.proto	= DSA_TAG_PROTO_KSZ9477,
 	.xmit	= ksz9477_xmit,
 	.rcv	= ksz9477_rcv,
 	.overhead = KSZ9477_INGRESS_TAG_LEN,
@@ -171,6 +172,7 @@ static struct sk_buff *ksz9893_xmit(struct sk_buff *skb,
 
 const struct dsa_device_ops ksz9893_netdev_ops = {
 	.name	= "ksz9893",
+	.proto	= DSA_TAG_PROTO_KSZ9893,
 	.xmit	= ksz9893_xmit,
 	.rcv	= ksz9477_rcv,
 	.overhead = KSZ_INGRESS_TAG_LEN,
diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index 1f5819e4e687..b6ef1e1a6673 100644
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -130,6 +130,7 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
 
 const struct dsa_device_ops lan9303_netdev_ops = {
 	.name = "lan9303",
+	.proto	= DSA_TAG_PROTO_LAN9303,
 	.xmit = lan9303_xmit,
 	.rcv = lan9303_rcv,
 	.overhead = LAN9303_TAG_LEN,
diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
index 7ecafb569f74..ca02ab3dcd80 100644
--- a/net/dsa/tag_mtk.c
+++ b/net/dsa/tag_mtk.c
@@ -100,6 +100,7 @@ static int mtk_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 
 const struct dsa_device_ops mtk_netdev_ops = {
 	.name		= "mtk",
+	.proto		= DSA_TAG_PROTO_MTK,
 	.xmit		= mtk_tag_xmit,
 	.rcv		= mtk_tag_rcv,
 	.flow_dissect	= mtk_tag_flow_dissect,
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index f3fdeafef1fe..1ff65c2e0cb4 100644
--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -101,6 +101,7 @@ static int qca_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 
 const struct dsa_device_ops qca_netdev_ops = {
 	.name	= "qca",
+	.proto	= DSA_TAG_PROTO_QCA,
 	.xmit	= qca_tag_xmit,
 	.rcv	= qca_tag_rcv,
 	.flow_dissect = qca_tag_flow_dissect,
diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
index 9ec6aa7938cc..628ab1a44ed7 100644
--- a/net/dsa/tag_trailer.c
+++ b/net/dsa/tag_trailer.c
@@ -79,6 +79,7 @@ static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev,
 
 const struct dsa_device_ops trailer_netdev_ops = {
 	.name	= "trailer",
+	.proto	= DSA_TAG_PROTO_TRAILER,
 	.xmit	= trailer_xmit,
 	.rcv	= trailer_rcv,
 	.overhead = 4,
-- 
2.20.1

[PATCH v2 net-next 06/14] dsa: Add boilerplate helper to register DSA tag driver modules

[Andrew Lunn]

A DSA tag driver module will need to register the tag protocols it
implements with the DSA core. Add macros containing this boiler plate.

The registration/unregistration code is currently just a stub. A Later
patch will add the real implementation.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

v2
Fix indent of #endif
Rewrite to move list pointer into a new structure
---
 include/net/dsa.h     | 66 +++++++++++++++++++++++++++++++++++++++++++
 net/dsa/dsa.c         | 12 ++++++++
 net/dsa/tag_brcm.c    | 16 ++++++++++-
 net/dsa/tag_dsa.c     |  2 ++
 net/dsa/tag_edsa.c    |  2 ++
 net/dsa/tag_gswip.c   |  2 ++
 net/dsa/tag_ksz.c     | 12 +++++++-
 net/dsa/tag_lan9303.c |  2 ++
 net/dsa/tag_mtk.c     |  2 ++
 net/dsa/tag_qca.c     |  2 ++
 net/dsa/tag_trailer.c |  2 ++
 11 files changed, 118 insertions(+), 2 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 720036f48fb3..fa315df5b756 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -594,4 +594,70 @@ int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data);
 int dsa_port_get_phy_sset_count(struct dsa_port *dp);
 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up);
 
+struct dsa_tag_driver {
+	const struct dsa_device_ops *ops;
+	struct list_head list;
+	struct module *owner;
+};
+
+void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
+			      unsigned int count,
+			      struct module *owner);
+void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
+				unsigned int count);
+
+/**
+ * module_dsa_tag_drivers() - Helper macro for registering DSA tag
+ * drivers
+ * @__ops_array: Array of tag driver strucutres
+ *
+ * Helper macro for DSA tag drivers which do not do anything special
+ * in module init/exit. Each module may only use this macro once, and
+ * calling it replaces module_init() and module_exit().
+ */
+#define dsa_tag_driver_module_drivers(__dsa_tag_drivers_array, __count)	\
+static int __init dsa_tag_driver_module_init(void)			\
+{									\
+	dsa_tag_drivers_register(__dsa_tag_drivers_array, __count,	\
+					THIS_MODULE);			\
+	return 0;							\
+}									\
+module_init(dsa_tag_driver_module_init);				\
+									\
+static void __exit dsa_tag_driver_module_exit(void)			\
+{									\
+	dsa_tag_drivers_unregister(__dsa_tag_drivers_array, __count);	\
+}									\
+module_exit(dsa_tag_driver_module_exit)
+
+#define module_dsa_tag_drivers(__ops_array)				\
+dsa_tag_driver_module_drivers(__ops_array, ARRAY_SIZE(__ops_array))
+
+#define DSA_TAG_DRIVER_NAME(__ops) dsa_tag_driver ## _ ## __ops
+
+/* Create a static structure we can build a linked list of dsa_tag
+ * drivers
+ */
+#define DSA_TAG_DRIVER(__ops)						\
+static struct dsa_tag_driver DSA_TAG_DRIVER_NAME(__ops) = {		\
+	.ops = &__ops,							\
+}
+
+/**
+ * module_dsa_tag_driver() - Helper macro for registering a single DSA tag
+ * driver
+ * @__ops: Single tag driver structures
+ *
+ * Helper macro for DSA tag drivers which do not do anything special
+ * in module init/exit. Each module may only use this macro once, and
+ * calling it replaces module_init() and module_exit().
+ */
+#define module_dsa_tag_driver(__ops)					\
+DSA_TAG_DRIVER(__ops);							\
+									\
+static struct dsa_tag_driver *dsa_tag_driver_array[] =	{		\
+	&DSA_TAG_DRIVER_NAME(__ops)					\
+};									\
+module_dsa_tag_drivers(dsa_tag_driver_array)
 #endif
+
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 2da733dff86b..34becafbd37b 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -76,6 +76,18 @@ const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
 	[DSA_TAG_PROTO_NONE] = &none_ops,
 };
 
+void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
+			      unsigned int count, struct module *owner)
+{
+}
+EXPORT_SYMBOL_GPL(dsa_tag_drivers_register);
+
+void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
+				unsigned int count)
+{
+}
+EXPORT_SYMBOL_GPL(dsa_tag_drivers_unregister);
+
 const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
 {
 	return ops->name;
diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index 39b380485e5a..63c8c6645a05 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -175,6 +175,7 @@ const struct dsa_device_ops brcm_netdev_ops = {
 	.overhead = BRCM_TAG_LEN,
 };
 
+DSA_TAG_DRIVER(brcm_netdev_ops);
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_BRCM);
 #endif
 
@@ -203,5 +204,18 @@ const struct dsa_device_ops brcm_prepend_netdev_ops = {
 };
 #endif
 
-MODULE_LICENSE("GPL");
+DSA_TAG_DRIVER(brcm_prepend_netdev_ops);
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_BRCM_PREPEND);
+
+static struct dsa_tag_driver *dsa_tag_driver_array[] =	{
+#if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM)
+	&DSA_TAG_DRIVER_NAME(brcm_netdev_ops),
+#endif
+#if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM_PREPEND)
+	&DSA_TAG_DRIVER_NAME(brcm_prepend_netdev_ops),
+#endif
+};
+
+module_dsa_tag_drivers(dsa_tag_driver_array);
+
+MODULE_LICENSE("GPL");
diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
index ec9b66c11219..96b5147b6f3e 100644
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -161,3 +161,5 @@ const struct dsa_device_ops dsa_netdev_ops = {
 
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_DSA);
+
+module_dsa_tag_driver(dsa_netdev_ops);
diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c
index 866d4e684511..76bf3db4e9d4 100644
--- a/net/dsa/tag_edsa.c
+++ b/net/dsa/tag_edsa.c
@@ -180,3 +180,5 @@ const struct dsa_device_ops edsa_netdev_ops = {
 
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_EDSA);
+
+module_dsa_tag_driver(edsa_netdev_ops);
diff --git a/net/dsa/tag_gswip.c b/net/dsa/tag_gswip.c
index 192156373108..ee5167180e79 100644
--- a/net/dsa/tag_gswip.c
+++ b/net/dsa/tag_gswip.c
@@ -113,3 +113,5 @@ const struct dsa_device_ops gswip_netdev_ops = {
 
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_GSWIP);
+
+module_dsa_tag_driver(gswip_netdev_ops);
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 5f5c8f9a6141..02689ac6f9da 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -141,6 +141,7 @@ const struct dsa_device_ops ksz9477_netdev_ops = {
 	.overhead = KSZ9477_INGRESS_TAG_LEN,
 };
 
+DSA_TAG_DRIVER(ksz9477_netdev_ops);
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9477);
 
 #define KSZ9893_TAIL_TAG_OVERRIDE	BIT(5)
@@ -178,5 +179,14 @@ const struct dsa_device_ops ksz9893_netdev_ops = {
 	.overhead = KSZ_INGRESS_TAG_LEN,
 };
 
-MODULE_LICENSE("GPL");
+DSA_TAG_DRIVER(ksz9893_netdev_ops);
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9893);
+
+static struct dsa_tag_driver *dsa_tag_driver_array[] = {
+	&DSA_TAG_DRIVER_NAME(ksz9477_netdev_ops),
+	&DSA_TAG_DRIVER_NAME(ksz9893_netdev_ops),
+};
+
+module_dsa_tag_drivers(dsa_tag_driver_array);
+
+MODULE_LICENSE("GPL");
diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index b6ef1e1a6673..609a2405abd8 100644
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -138,3 +138,5 @@ const struct dsa_device_ops lan9303_netdev_ops = {
 
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_LAN9303);
+
+module_dsa_tag_driver(lan9303_netdev_ops);
diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
index ca02ab3dcd80..a4d2dcdb7102 100644
--- a/net/dsa/tag_mtk.c
+++ b/net/dsa/tag_mtk.c
@@ -109,3 +109,5 @@ const struct dsa_device_ops mtk_netdev_ops = {
 
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_MTK);
+
+module_dsa_tag_driver(mtk_netdev_ops);
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index 1ff65c2e0cb4..552ddfbbf5ec 100644
--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -110,3 +110,5 @@ const struct dsa_device_ops qca_netdev_ops = {
 
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA);
+
+module_dsa_tag_driver(qca_netdev_ops);
diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
index 628ab1a44ed7..807cc2dff052 100644
--- a/net/dsa/tag_trailer.c
+++ b/net/dsa/tag_trailer.c
@@ -87,3 +87,5 @@ const struct dsa_device_ops trailer_netdev_ops = {
 
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_TRAILER);
+
+module_dsa_tag_driver(trailer_netdev_ops);
-- 
2.20.1

[PATCH v2 net-next 07/14] dsa: Keep link list of tag drivers

[Andrew Lunn]

Let the tag drivers register themselves with the DSA core, keeping
them in a linked list.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>

v2
--
List pointer has been moved
void functions, since there cannot be errors
---
 net/dsa/dsa.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 34becafbd37b..32778df1be27 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -27,6 +27,9 @@
 
 #include "dsa_priv.h"
 
+static LIST_HEAD(dsa_tag_drivers_list);
+static DEFINE_MUTEX(dsa_tag_drivers_lock);
+
 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 					    struct net_device *dev)
 {
@@ -76,15 +79,40 @@ const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
 	[DSA_TAG_PROTO_NONE] = &none_ops,
 };
 
+static void dsa_tag_driver_register(struct dsa_tag_driver *dsa_tag_driver,
+				    struct module *owner)
+{
+	dsa_tag_driver->owner = owner;
+
+	mutex_lock(&dsa_tag_drivers_lock);
+	list_add_tail(&dsa_tag_driver->list, &dsa_tag_drivers_list);
+	mutex_unlock(&dsa_tag_drivers_lock);
+}
+
 void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
 			      unsigned int count, struct module *owner)
 {
+	unsigned int i;
+
+	for (i = 0; i < count; i++)
+		dsa_tag_driver_register(dsa_tag_driver_array[i], owner);
+}
+
+static void dsa_tag_driver_unregister(struct dsa_tag_driver *dsa_tag_driver)
+{
+	mutex_lock(&dsa_tag_drivers_lock);
+	list_del(&dsa_tag_driver->list);
+	mutex_unlock(&dsa_tag_drivers_lock);
 }
 EXPORT_SYMBOL_GPL(dsa_tag_drivers_register);
 
 void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
 				unsigned int count)
 {
+	unsigned int i;
+
+	for (i = 0; i < count; i++)
+		dsa_tag_driver_unregister(dsa_tag_driver_array[i]);
 }
 EXPORT_SYMBOL_GPL(dsa_tag_drivers_unregister);
 
-- 
2.20.1

[PATCH v2 net-next 08/14] dsa: Register the none tagger ops

[Andrew Lunn]

The none tagger is special in that it does not live in a tag_*.c file,
but is within the core. Register/unregister when DSA is
loaded/unloaded.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
 net/dsa/dsa.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 32778df1be27..71907acd8f82 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -44,6 +44,8 @@ static const struct dsa_device_ops none_ops = {
 	.rcv	= NULL,
 };
 
+DSA_TAG_DRIVER(none_ops);
+
 const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
 #ifdef CONFIG_NET_DSA_TAG_BRCM
 	[DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
@@ -352,12 +354,17 @@ static int __init dsa_init_module(void)
 
 	dev_add_pack(&dsa_pack_type);
 
+	dsa_tag_driver_register(&DSA_TAG_DRIVER_NAME(none_ops),
+				THIS_MODULE);
+
 	return 0;
 }
 module_init(dsa_init_module);
 
 static void __exit dsa_cleanup_module(void)
 {
+	dsa_tag_driver_unregister(&DSA_TAG_DRIVER_NAME(none_ops));
+
 	dsa_slave_unregister_notifier();
 	dev_remove_pack(&dsa_pack_type);
 	dsa_legacy_unregister();
-- 
2.20.1

[PATCH v2 net-next 09/14] dsa: Rename dsa_resolve_tag_protocol() to _get ready for locking

[Andrew Lunn]

dsa_resolve_tag_protocol() is used to find the tagging driver needed
by a switch driver. When the tagging drivers become modules, it will
be necassary to take a reference on the module to prevent it being
unloaded. So rename this function to _get() to indicate it has some
locking properties.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
 net/dsa/dsa.c      | 2 +-
 net/dsa/dsa2.c     | 2 +-
 net/dsa/dsa_priv.h | 3 ++-
 net/dsa/legacy.c   | 2 +-
 4 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 71907acd8f82..0a68d784ea18 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -123,7 +123,7 @@ const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
 	return ops->name;
 };
 
-const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
+const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
 {
 	const struct dsa_device_ops *ops;
 
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index d122f1bcdab2..ba91bda8bdd3 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -577,7 +577,7 @@ static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
 	enum dsa_tag_protocol tag_protocol;
 
 	tag_protocol = ds->ops->get_tag_protocol(ds, dp->index);
-	tag_ops = dsa_resolve_tag_protocol(tag_protocol);
+	tag_ops = dsa_tag_driver_get(tag_protocol);
 	if (IS_ERR(tag_ops)) {
 		dev_warn(ds->dev, "No tagger for this switch\n");
 		return PTR_ERR(tag_ops);
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 093b7d145eb1..abe3abeb0bb9 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -84,7 +84,8 @@ struct dsa_slave_priv {
 };
 
 /* dsa.c */
-const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol);
+const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol);
+
 bool dsa_schedule_work(struct work_struct *work);
 const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops);
 
diff --git a/net/dsa/legacy.c b/net/dsa/legacy.c
index cb42939db776..a8c076250237 100644
--- a/net/dsa/legacy.c
+++ b/net/dsa/legacy.c
@@ -152,7 +152,7 @@ static int dsa_switch_setup_one(struct dsa_switch *ds,
 		enum dsa_tag_protocol tag_protocol;
 
 		tag_protocol = ops->get_tag_protocol(ds, dst->cpu_dp->index);
-		tag_ops = dsa_resolve_tag_protocol(tag_protocol);
+		tag_ops = dsa_tag_driver_get(tag_protocol);
 		if (IS_ERR(tag_ops))
 			return PTR_ERR(tag_ops);
 
-- 
2.20.1

[PATCH v2 net-next 10/14] dsa: Add stub tag driver put method

[Andrew Lunn]

When a DSA switch driver is unloaded, the lock on the tag driver
should be released so the module can be unloaded. Add the needed calls,
but leave the actual release code as a stub.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

v2
--
Fix fall-through comment
---
 net/dsa/dsa.c      | 4 ++++
 net/dsa/dsa2.c     | 2 ++
 net/dsa/dsa_priv.h | 1 +
 net/dsa/legacy.c   | 2 ++
 4 files changed, 9 insertions(+)

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 0a68d784ea18..54e89c97ce11 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -137,6 +137,10 @@ const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
 	return ops;
 }
 
+void dsa_tag_driver_put(const struct dsa_device_ops *ops)
+{
+}
+
 static int dev_is_class(struct device *dev, void *class)
 {
 	if (dev->class != NULL && !strcmp(dev->class->name, class))
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index ba91bda8bdd3..bbc9f56e89b9 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -335,6 +335,8 @@ static void dsa_port_teardown(struct dsa_port *dp)
 	case DSA_PORT_TYPE_UNUSED:
 		break;
 	case DSA_PORT_TYPE_CPU:
+		dsa_tag_driver_put(dp->tag_ops);
+		/* fall-through */
 	case DSA_PORT_TYPE_DSA:
 		dsa_port_link_unregister_of(dp);
 		break;
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index abe3abeb0bb9..ea482e88f7b8 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -85,6 +85,7 @@ struct dsa_slave_priv {
 
 /* dsa.c */
 const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol);
+void dsa_tag_driver_put(const struct dsa_device_ops *ops);
 
 bool dsa_schedule_work(struct work_struct *work);
 const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops);
diff --git a/net/dsa/legacy.c b/net/dsa/legacy.c
index a8c076250237..219f4fa7ff4b 100644
--- a/net/dsa/legacy.c
+++ b/net/dsa/legacy.c
@@ -163,6 +163,8 @@ static int dsa_switch_setup_one(struct dsa_switch *ds,
 		dst->cpu_dp->dst = dst;
 	}
 
+	dsa_tag_driver_put(dst->cpu_dp->tag_ops);
+
 	memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
 
 	/*
-- 
2.20.1

[PATCH v2 net-next 11/14] dsa: Make use of the list of tag drivers

[Andrew Lunn]

Implement the _get and _put functions to make use of the list of tag
drivers. Also, trigger the loading of the module, based on the alias
information. The _get function takes a reference on the tag driver, so
it cannot be unloaded, and the _put function releases the reference.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

v2:
Make tag_driver_register void
---
 net/dsa/dsa.c | 39 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 5 deletions(-)

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 54e89c97ce11..67d21647c500 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -125,20 +125,49 @@ const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
 
 const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
 {
+	struct dsa_tag_driver *dsa_tag_driver;
 	const struct dsa_device_ops *ops;
+	char module_name[128];
+	bool found = false;
 
-	if (tag_protocol >= DSA_TAG_LAST)
-		return ERR_PTR(-EINVAL);
-	ops = dsa_device_ops[tag_protocol];
+	snprintf(module_name, 127, "%s%d", DSA_TAG_DRIVER_ALIAS,
+		 tag_protocol);
 
-	if (!ops)
-		return ERR_PTR(-ENOPROTOOPT);
+	request_module(module_name);
+
+	mutex_lock(&dsa_tag_drivers_lock);
+	list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
+		ops = dsa_tag_driver->ops;
+		if (ops->proto == tag_protocol) {
+			found = true;
+			break;
+		}
+	}
+
+	if (found) {
+		if (!try_module_get(dsa_tag_driver->owner))
+			ops = ERR_PTR(-ENOPROTOOPT);
+	} else {
+		ops = ERR_PTR(-ENOPROTOOPT);
+	}
+
+	mutex_unlock(&dsa_tag_drivers_lock);
 
 	return ops;
 }
 
 void dsa_tag_driver_put(const struct dsa_device_ops *ops)
 {
+	struct dsa_tag_driver *dsa_tag_driver;
+
+	mutex_lock(&dsa_tag_drivers_lock);
+	list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
+		if (dsa_tag_driver->ops == ops) {
+			module_put(dsa_tag_driver->owner);
+			break;
+		}
+	}
+	mutex_unlock(&dsa_tag_drivers_lock);
 }
 
 static int dev_is_class(struct device *dev, void *class)
-- 
2.20.1

[PATCH v2 net-next 12/14] dsa: Cleanup unneeded table and make tag structures static

[Andrew Lunn]

Now that tag drivers dynamically register, we don't need the static
table. Remove it. This also means the tag driver structures can be
made static.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
 include/net/dsa.h     |  1 -
 net/dsa/dsa.c         | 35 -----------------------------------
 net/dsa/dsa_priv.h    | 30 ------------------------------
 net/dsa/tag_brcm.c    |  4 ++--
 net/dsa/tag_dsa.c     |  2 +-
 net/dsa/tag_edsa.c    |  2 +-
 net/dsa/tag_gswip.c   |  2 +-
 net/dsa/tag_ksz.c     |  4 ++--
 net/dsa/tag_lan9303.c |  2 +-
 net/dsa/tag_mtk.c     |  2 +-
 net/dsa/tag_qca.c     |  2 +-
 net/dsa/tag_trailer.c |  2 +-
 12 files changed, 11 insertions(+), 77 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index fa315df5b756..eb658d5835be 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -56,7 +56,6 @@ enum dsa_tag_protocol {
 	DSA_TAG_PROTO_MTK		= DSA_TAG_PROTO_MTK_VALUE,
 	DSA_TAG_PROTO_QCA		= DSA_TAG_PROTO_QCA_VALUE,
 	DSA_TAG_PROTO_TRAILER		= DSA_TAG_PROTO_TRAILER_VALUE,
-	DSA_TAG_LAST,			/* MUST BE LAST */
 };
 
 struct packet_type;
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 67d21647c500..ba04c78633be 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -46,41 +46,6 @@ static const struct dsa_device_ops none_ops = {
 
 DSA_TAG_DRIVER(none_ops);
 
-const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
-#ifdef CONFIG_NET_DSA_TAG_BRCM
-	[DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
-#endif
-#ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND
-	[DSA_TAG_PROTO_BRCM_PREPEND] = &brcm_prepend_netdev_ops,
-#endif
-#ifdef CONFIG_NET_DSA_TAG_DSA
-	[DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
-#endif
-#ifdef CONFIG_NET_DSA_TAG_EDSA
-	[DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
-#endif
-#ifdef CONFIG_NET_DSA_TAG_GSWIP
-	[DSA_TAG_PROTO_GSWIP] = &gswip_netdev_ops,
-#endif
-#ifdef CONFIG_NET_DSA_TAG_KSZ9477
-	[DSA_TAG_PROTO_KSZ9477] = &ksz9477_netdev_ops,
-	[DSA_TAG_PROTO_KSZ9893] = &ksz9893_netdev_ops,
-#endif
-#ifdef CONFIG_NET_DSA_TAG_LAN9303
-	[DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
-#endif
-#ifdef CONFIG_NET_DSA_TAG_MTK
-	[DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
-#endif
-#ifdef CONFIG_NET_DSA_TAG_QCA
-	[DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
-#endif
-#ifdef CONFIG_NET_DSA_TAG_TRAILER
-	[DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
-#endif
-	[DSA_TAG_PROTO_NONE] = &none_ops,
-};
-
 static void dsa_tag_driver_register(struct dsa_tag_driver *dsa_tag_driver,
 				    struct module *owner)
 {
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index ea482e88f7b8..e860512d673a 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -202,34 +202,4 @@ dsa_slave_to_master(const struct net_device *dev)
 /* switch.c */
 int dsa_switch_register_notifier(struct dsa_switch *ds);
 void dsa_switch_unregister_notifier(struct dsa_switch *ds);
-
-/* tag_brcm.c */
-extern const struct dsa_device_ops brcm_netdev_ops;
-extern const struct dsa_device_ops brcm_prepend_netdev_ops;
-
-/* tag_dsa.c */
-extern const struct dsa_device_ops dsa_netdev_ops;
-
-/* tag_edsa.c */
-extern const struct dsa_device_ops edsa_netdev_ops;
-
-/* tag_gswip.c */
-extern const struct dsa_device_ops gswip_netdev_ops;
-
-/* tag_ksz.c */
-extern const struct dsa_device_ops ksz9477_netdev_ops;
-extern const struct dsa_device_ops ksz9893_netdev_ops;
-
-/* tag_lan9303.c */
-extern const struct dsa_device_ops lan9303_netdev_ops;
-
-/* tag_mtk.c */
-extern const struct dsa_device_ops mtk_netdev_ops;
-
-/* tag_qca.c */
-extern const struct dsa_device_ops qca_netdev_ops;
-
-/* tag_trailer.c */
-extern const struct dsa_device_ops trailer_netdev_ops;
-
 #endif
diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index 63c8c6645a05..9890097a85d9 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -167,7 +167,7 @@ static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 	return nskb;
 }
 
-const struct dsa_device_ops brcm_netdev_ops = {
+static const struct dsa_device_ops brcm_netdev_ops = {
 	.name	= "brcm",
 	.proto	= DSA_TAG_PROTO_BRCM,
 	.xmit	= brcm_tag_xmit,
@@ -195,7 +195,7 @@ static struct sk_buff *brcm_tag_rcv_prepend(struct sk_buff *skb,
 	return brcm_tag_rcv_ll(skb, dev, pt, ETH_HLEN);
 }
 
-const struct dsa_device_ops brcm_prepend_netdev_ops = {
+static const struct dsa_device_ops brcm_prepend_netdev_ops = {
 	.name	= "brcm-prepend",
 	.proto	= DSA_TAG_PROTO_BRCM_PREPEND,
 	.xmit	= brcm_tag_xmit_prepend,
diff --git a/net/dsa/tag_dsa.c b/net/dsa/tag_dsa.c
index 96b5147b6f3e..7ddec9794477 100644
--- a/net/dsa/tag_dsa.c
+++ b/net/dsa/tag_dsa.c
@@ -150,7 +150,7 @@ static int dsa_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 	return 0;
 }
 
-const struct dsa_device_ops dsa_netdev_ops = {
+static const struct dsa_device_ops dsa_netdev_ops = {
 	.name	= "dsa",
 	.proto	= DSA_TAG_PROTO_DSA,
 	.xmit	= dsa_xmit,
diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c
index 76bf3db4e9d4..e8eaa804ccb9 100644
--- a/net/dsa/tag_edsa.c
+++ b/net/dsa/tag_edsa.c
@@ -169,7 +169,7 @@ static int edsa_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 	return 0;
 }
 
-const struct dsa_device_ops edsa_netdev_ops = {
+static const struct dsa_device_ops edsa_netdev_ops = {
 	.name	= "edsa",
 	.proto	= DSA_TAG_PROTO_EDSA,
 	.xmit	= edsa_xmit,
diff --git a/net/dsa/tag_gswip.c b/net/dsa/tag_gswip.c
index ee5167180e79..b678160bbd66 100644
--- a/net/dsa/tag_gswip.c
+++ b/net/dsa/tag_gswip.c
@@ -103,7 +103,7 @@ static struct sk_buff *gswip_tag_rcv(struct sk_buff *skb,
 	return skb;
 }
 
-const struct dsa_device_ops gswip_netdev_ops = {
+static const struct dsa_device_ops gswip_netdev_ops = {
 	.name = "gwsip",
 	.proto	= DSA_TAG_PROTO_GSWIP,
 	.xmit = gswip_tag_xmit,
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 02689ac6f9da..b4872b87d4a6 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -133,7 +133,7 @@ static struct sk_buff *ksz9477_rcv(struct sk_buff *skb, struct net_device *dev,
 	return ksz_common_rcv(skb, dev, port, len);
 }
 
-const struct dsa_device_ops ksz9477_netdev_ops = {
+static const struct dsa_device_ops ksz9477_netdev_ops = {
 	.name	= "ksz9477",
 	.proto	= DSA_TAG_PROTO_KSZ9477,
 	.xmit	= ksz9477_xmit,
@@ -171,7 +171,7 @@ static struct sk_buff *ksz9893_xmit(struct sk_buff *skb,
 	return nskb;
 }
 
-const struct dsa_device_ops ksz9893_netdev_ops = {
+static const struct dsa_device_ops ksz9893_netdev_ops = {
 	.name	= "ksz9893",
 	.proto	= DSA_TAG_PROTO_KSZ9893,
 	.xmit	= ksz9893_xmit,
diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index 609a2405abd8..eb0e7a32e53d 100644
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -128,7 +128,7 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
 	return skb;
 }
 
-const struct dsa_device_ops lan9303_netdev_ops = {
+static const struct dsa_device_ops lan9303_netdev_ops = {
 	.name = "lan9303",
 	.proto	= DSA_TAG_PROTO_LAN9303,
 	.xmit = lan9303_xmit,
diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
index a4d2dcdb7102..b5705cba8318 100644
--- a/net/dsa/tag_mtk.c
+++ b/net/dsa/tag_mtk.c
@@ -98,7 +98,7 @@ static int mtk_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 	return 0;
 }
 
-const struct dsa_device_ops mtk_netdev_ops = {
+static const struct dsa_device_ops mtk_netdev_ops = {
 	.name		= "mtk",
 	.proto		= DSA_TAG_PROTO_MTK,
 	.xmit		= mtk_tag_xmit,
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index 552ddfbbf5ec..c95885215525 100644
--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -99,7 +99,7 @@ static int qca_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto,
 	return 0;
 }
 
-const struct dsa_device_ops qca_netdev_ops = {
+static const struct dsa_device_ops qca_netdev_ops = {
 	.name	= "qca",
 	.proto	= DSA_TAG_PROTO_QCA,
 	.xmit	= qca_tag_xmit,
diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
index 807cc2dff052..4f8ab62f0208 100644
--- a/net/dsa/tag_trailer.c
+++ b/net/dsa/tag_trailer.c
@@ -77,7 +77,7 @@ static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev,
 	return skb;
 }
 
-const struct dsa_device_ops trailer_netdev_ops = {
+static const struct dsa_device_ops trailer_netdev_ops = {
 	.name	= "trailer",
 	.proto	= DSA_TAG_PROTO_TRAILER,
 	.xmit	= trailer_xmit,
-- 
2.20.1

[PATCH v2 net-next 13/14] dsa: tag_brcm: Avoid unused symbols

[Andrew Lunn]

It is possible that the driver is compiled with both
CONFIG_NET_DSA_TAG_BRCM and CONFIG_NET_DSA_TAG_BRCM_PREPEND disabled.
This results in warnings about unused symbols. Add some conditional
compilation to avoid this.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

v2
Reorder patch to before tag drivers can be modules
---
 net/dsa/tag_brcm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index 9890097a85d9..d52db5f2c721 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -55,6 +55,9 @@
 #define BRCM_EG_TC_MASK		0x7
 #define BRCM_EG_PID_MASK	0x1f
 
+#if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM) || \
+	IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM_PREPEND)
+
 static struct sk_buff *brcm_tag_xmit_ll(struct sk_buff *skb,
 					struct net_device *dev,
 					unsigned int offset)
@@ -139,8 +142,9 @@ static struct sk_buff *brcm_tag_rcv_ll(struct sk_buff *skb,
 
 	return skb;
 }
+#endif
 
-#ifdef CONFIG_NET_DSA_TAG_BRCM
+#if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM)
 static struct sk_buff *brcm_tag_xmit(struct sk_buff *skb,
 				     struct net_device *dev)
 {
@@ -179,7 +183,7 @@ DSA_TAG_DRIVER(brcm_netdev_ops);
 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_BRCM);
 #endif
 
-#ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND
+#if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM_PREPEND)
 static struct sk_buff *brcm_tag_xmit_prepend(struct sk_buff *skb,
 					     struct net_device *dev)
 {
-- 
2.20.1

[PATCH v2 net-next 14/14] dsa: Allow tag drivers to be built as modules

[Andrew Lunn]

Make the CONFIG symbols tristate and add help text.

The broadcom and Microchip KSZ tag drivers support two different
tagging protocols in one driver. Add a configuration option for the
drivers, and then options to select the protocol.

Create a submenu for the tagging drivers.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>

v2:
tab/space cleanup
Help text wording
NET_DSA_TAG_BRCM_COMMON and NET_DSA_TAG_KZS_COMMON hidden
---
 net/dsa/Kconfig  | 83 +++++++++++++++++++++++++++++++++++++-----------
 net/dsa/Makefile | 19 ++++++-----
 2 files changed, 73 insertions(+), 29 deletions(-)

diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index b695170795c2..8e9a381cf58e 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -4,7 +4,7 @@ config HAVE_NET_DSA
 
 # Drivers must select NET_DSA and the appropriate tagging format
 
-config NET_DSA
+menuconfig NET_DSA
 	tristate "Distributed Switch Architecture"
 	depends on HAVE_NET_DSA
 	depends on BRIDGE || BRIDGE=n
@@ -26,39 +26,84 @@ config NET_DSA_LEGACY
 
 	  This feature is scheduled for removal in 4.17.
 
-# tagging formats
+config NET_DSA_TAG_BRCM_COMMON
+	tristate
+	default n
+
 config NET_DSA_TAG_BRCM
-	bool
+	tristate "Tag driver for Broadcom switches using in frame headers"
+	select NET_DSA_TAG_BRCM_COMMON
+	help
+	  Say Y if you want to enable support for tagging frames for the
+	  Broadcom switches which place the tag after the MAC source address.
+
 
 config NET_DSA_TAG_BRCM_PREPEND
-	bool
+	tristate "Tag driver for Broadcom switches using prepended headers"
+	select NET_DSA_TAG_BRCM_COMMON
+	help
+	  Say Y if you want to enable support for tagging frames for the
+	  Broadcom switches which places the tag before the Ethernet header
+	  (preprended).
+
+config NET_DSA_TAG_GSWIP
+	tristate "Tag driver for Lantiq / Intel GSWIP switches"
+	help
+	  Say Y or M if you want to enable support for tagging frames for the
+	  Lantiq / Intel GSWIP switches
 
 config NET_DSA_TAG_DSA
-	bool
+	tristate "Tag driver for Marvell switches using DSA headers"
+	help
+	  Say Y or M if you want to enable support for tagging frames for the
+	  Marvell switches which use DSA headers
 
 config NET_DSA_TAG_EDSA
-	bool
+	tristate "Tag driver for Marvell switches using EtherType DSA headers"
+	help
+	  Say Y or M if you want to enable support for tagging frames for the
+	  Marvell switches which use EtherType DSA headers
 
-config NET_DSA_TAG_GSWIP
-	bool
+config NET_DSA_TAG_MTK
+	tristate "Tag driver for Mediatek switches"
+	help
+	  Say Y or M if you want to enable support for tagging frames for
+	  Mediatek switches
+
+config NET_DSA_TAG_KSZ_COMMON
+	tristate
+	default n
 
 config NET_DSA_TAG_KSZ
-	bool
+	tristate "Tag driver for Microchip 9893 family of switches"
+	select NET_DSA_TAG_KSZ_COMMON
+	help
+	  Say Y if you want to enable support for tagging frames for the
+	  Microchip 9893 family of switches
 
 config NET_DSA_TAG_KSZ9477
-	bool
-	select NET_DSA_TAG_KSZ
+	tristate "Tag driver for Microchip 9477 family of switches"
+	select NET_DSA_TAG_KSZ_COMMON
+	help
+	  Say Y if you want to enable support for tagging frames for the
+	  Microchip 9477 family of switches
 
-config NET_DSA_TAG_LAN9303
-	bool
+config NET_DSA_TAG_QCA
+       tristate "Tag driver for Qualcomm Atheros QCA8K switches"
+	help
+	  Say Y or M if you want to enable support for tagging frames for
+	  the Qualcomm Atheros QCA8K switches
 
-config NET_DSA_TAG_MTK
-	bool
+config NET_DSA_TAG_LAN9303
+	tristate "Tag driver for SMSC/Microchip LAN9303 family of switches"
+	help
+	  Say Y or M if you want to enable support for tagging frames for the
+	  SMSC/Microchip LAN9303 family of switches
 
 config NET_DSA_TAG_TRAILER
-	bool
-
-config NET_DSA_TAG_QCA
-	bool
+       tristate "Tag driver for switches using a trailler tag"
+	help
+	  Say Y or M if you want to enable support for tagging frames at
+	  with a trailed. e.g. Marvell 88E6060
 
 endif
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index 6e721f7a2947..717ac1618100 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -5,13 +5,12 @@ dsa_core-y += dsa.o dsa2.o master.o port.o slave.o switch.o
 dsa_core-$(CONFIG_NET_DSA_LEGACY) += legacy.o
 
 # tagging formats
-dsa_core-$(CONFIG_NET_DSA_TAG_BRCM) += tag_brcm.o
-dsa_core-$(CONFIG_NET_DSA_TAG_BRCM_PREPEND) += tag_brcm.o
-dsa_core-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o
-dsa_core-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o
-dsa_core-$(CONFIG_NET_DSA_TAG_GSWIP) += tag_gswip.o
-dsa_core-$(CONFIG_NET_DSA_TAG_KSZ) += tag_ksz.o
-dsa_core-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o
-dsa_core-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
-dsa_core-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
-dsa_core-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
+obj-$(CONFIG_NET_DSA_TAG_BRCM_COMMON) += tag_brcm.o
+obj-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o
+obj-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o
+obj-$(CONFIG_NET_DSA_TAG_GSWIP) += tag_gswip.o
+obj-$(CONFIG_NET_DSA_TAG_KSZ_COMMON) += tag_ksz.o
+obj-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o
+obj-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
+obj-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
+obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
-- 
2.20.1

Re: [PATCH v2 net-next 14/14] dsa: Allow tag drivers to be built as modules

[Randy Dunlap]

On 4/22/19 5:22 PM, Andrew Lunn wrote:
> Make the CONFIG symbols tristate and add help text.
> 
> The broadcom and Microchip KSZ tag drivers support two different
> tagging protocols in one driver. Add a configuration option for the
> drivers, and then options to select the protocol.
> 
> Create a submenu for the tagging drivers.
> 
> Signed-off-by: Andrew Lunn <andrew@lunn.ch>

Hi,
I have a few more cleanups for the Kconfig file (please see below).

> v2:
> tab/space cleanup
> Help text wording
> NET_DSA_TAG_BRCM_COMMON and NET_DSA_TAG_KZS_COMMON hidden
> ---
>  net/dsa/Kconfig  | 83 +++++++++++++++++++++++++++++++++++++-----------
>  net/dsa/Makefile | 19 ++++++-----
>  2 files changed, 73 insertions(+), 29 deletions(-)
> 
> diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
> index b695170795c2..8e9a381cf58e 100644
> --- a/net/dsa/Kconfig
> +++ b/net/dsa/Kconfig
> @@ -4,7 +4,7 @@ config HAVE_NET_DSA
>  
>  # Drivers must select NET_DSA and the appropriate tagging format
>  
> -config NET_DSA
> +menuconfig NET_DSA
>  	tristate "Distributed Switch Architecture"
>  	depends on HAVE_NET_DSA
>  	depends on BRIDGE || BRIDGE=n
> @@ -26,39 +26,84 @@ config NET_DSA_LEGACY
>  
>  	  This feature is scheduled for removal in 4.17.
>  
> -# tagging formats
> +config NET_DSA_TAG_BRCM_COMMON
> +	tristate
> +	default n
> +
>  config NET_DSA_TAG_BRCM
> -	bool
> +	tristate "Tag driver for Broadcom switches using in frame headers"

preferably:                                        using in-frame headers"
otherwise it is difficult to parse.

> +	select NET_DSA_TAG_BRCM_COMMON
> +	help
> +	  Say Y if you want to enable support for tagging frames for the
> +	  Broadcom switches which place the tag after the MAC source address.
> +
>  
>  config NET_DSA_TAG_BRCM_PREPEND
> -	bool
> +	tristate "Tag driver for Broadcom switches using prepended headers"
> +	select NET_DSA_TAG_BRCM_COMMON
> +	help
> +	  Say Y if you want to enable support for tagging frames for the
> +	  Broadcom switches which places the tag before the Ethernet header
> +	  (preprended).

	  (prepended).

> +
> +config NET_DSA_TAG_GSWIP
> +	tristate "Tag driver for Lantiq / Intel GSWIP switches"
> +	help
> +	  Say Y or M if you want to enable support for tagging frames for the
> +	  Lantiq / Intel GSWIP switches

please end with '.'

>  
>  config NET_DSA_TAG_DSA
> -	bool
> +	tristate "Tag driver for Marvell switches using DSA headers"
> +	help
> +	  Say Y or M if you want to enable support for tagging frames for the
> +	  Marvell switches which use DSA headers

ditto.

>  
>  config NET_DSA_TAG_EDSA
> -	bool
> +	tristate "Tag driver for Marvell switches using EtherType DSA headers"
> +	help
> +	  Say Y or M if you want to enable support for tagging frames for the
> +	  Marvell switches which use EtherType DSA headers

ditto.

>  
> -config NET_DSA_TAG_GSWIP
> -	bool
> +config NET_DSA_TAG_MTK
> +	tristate "Tag driver for Mediatek switches"
> +	help
> +	  Say Y or M if you want to enable support for tagging frames for
> +	  Mediatek switches

ditto.

> +
> +config NET_DSA_TAG_KSZ_COMMON
> +	tristate
> +	default n
>  
>  config NET_DSA_TAG_KSZ
> -	bool
> +	tristate "Tag driver for Microchip 9893 family of switches"
> +	select NET_DSA_TAG_KSZ_COMMON
> +	help
> +	  Say Y if you want to enable support for tagging frames for the
> +	  Microchip 9893 family of switches

ditto.

>  
>  config NET_DSA_TAG_KSZ9477
> -	bool
> -	select NET_DSA_TAG_KSZ
> +	tristate "Tag driver for Microchip 9477 family of switches"
> +	select NET_DSA_TAG_KSZ_COMMON
> +	help
> +	  Say Y if you want to enable support for tagging frames for the
> +	  Microchip 9477 family of switches

ditto.

>  
> -config NET_DSA_TAG_LAN9303
> -	bool
> +config NET_DSA_TAG_QCA
> +       tristate "Tag driver for Qualcomm Atheros QCA8K switches"

use tab to indent above instead of using spaces.

> +	help
> +	  Say Y or M if you want to enable support for tagging frames for
> +	  the Qualcomm Atheros QCA8K switches

end with '.'

>  
> -config NET_DSA_TAG_MTK
> -	bool
> +config NET_DSA_TAG_LAN9303
> +	tristate "Tag driver for SMSC/Microchip LAN9303 family of switches"
> +	help
> +	  Say Y or M if you want to enable support for tagging frames for the
> +	  SMSC/Microchip LAN9303 family of switches

ditto.

>  
>  config NET_DSA_TAG_TRAILER
> -	bool
> -
> -config NET_DSA_TAG_QCA
> -	bool
> +       tristate "Tag driver for switches using a trailler tag"

	                                            trailer

and indent above line with tab instead of spaces.


> +	help
> +	  Say Y or M if you want to enable support for tagging frames at
> +	  with a trailed. e.g. Marvell 88E6060

end with '.'

>  
>  endif

Thanks.
-- 
~Randy

Re: [PATCH v2 net-next 06/14] dsa: Add boilerplate helper to register DSA tag driver modules

[Jakub Kicinski]

On Tue, 23 Apr 2019 02:22:49 +0200, Andrew Lunn wrote:
> +/**
> + * module_dsa_tag_drivers() - Helper macro for registering DSA tag
> + * drivers
> + * @__ops_array: Array of tag driver strucutres
> + *
> + * Helper macro for DSA tag drivers which do not do anything special
> + * in module init/exit. Each module may only use this macro once, and
> + * calling it replaces module_init() and module_exit().
> + */

nit: looks like kdoc is misplaced

> +#define dsa_tag_driver_module_drivers(__dsa_tag_drivers_array, __count)	\
> +static int __init dsa_tag_driver_module_init(void)			\
> +{									\
> +	dsa_tag_drivers_register(__dsa_tag_drivers_array, __count,	\
> +					THIS_MODULE);			\

nit: THIS_MODULE doesn't align

Re: [PATCH v2 net-next 00/14] Make DSA tag drivers kernel modules

[Jakub Kicinski]

On Tue, 23 Apr 2019 02:22:43 +0200, Andrew Lunn wrote:
> istorically, DSA tag drivers have been compiled into the kernel as
H^

> part of the DSA core. With the growing number of tag drivers, it makes
> sense to allow this driver code to be compiled as a module, and loaded
> on demand.

Other than minor annoying nitpick looks like a very nice series!

Re: [PATCH v2 net-next 00/14] Make DSA tag drivers kernel modules

[David Miller]

From: Andrew Lunn <andrew@lunn.ch>
Date: Tue, 23 Apr 2019 02:22:43 +0200

> istorically, DSA tag drivers have been compiled into the kernel as
> part of the DSA core. With the growing number of tag drivers, it makes
> sense to allow this driver code to be compiled as a module, and loaded
> on demand.
> 
> v2
> --

Looks like one more spin with small fixups and this will be ready.

Re: [PATCH v2 net-next 00/14] Make DSA tag drivers kernel modules

[Andrew Lunn]

> Looks like one more spin with small fixups and this will be ready.

Yes. And i wanted to give Florian time to review the patches he
suggested changes to. I will wait a couple more days before
re-submitting.

	Andrew

Re: [PATCH v2 net-next 00/14] Make DSA tag drivers kernel modules

[Vivien Didelot]

Hi Andrew,

On Tue, 23 Apr 2019 02:22:43 +0200, Andrew Lunn <andrew@lunn.ch> wrote:
> istorically, DSA tag drivers have been compiled into the kernel as
> part of the DSA core. With the growing number of tag drivers, it makes
> sense to allow this driver code to be compiled as a module, and loaded
> on demand.
> 
> v2
> --
> Move name to end of structure, keeping the hot entries at the beginning.
> More tag protocol to end of structure to keep hot members at the beginning.
> Fix indent of #endif
> Rewrite to move list pointer into a new structure
> void functions, since there cannot be errors
> Fix fall-through comment
> Reorder patch for unused symbols to before tag drivers can be modules
> tab/space cleanup
> Help text wording
> NET_DSA_TAG_BRCM_COMMON and NET_DSA_TAG_KZS_COMMON hidden
> 
> 
> Andrew Lunn (14):
>   dsa: Add SPDX header to tag drivers.
>   dsa: Move tagger name into its ops structure
>   dsa: Add MODULE_ALIAS to taggers in preparation to become modules
>   dsa: Add MODULE_LICENSE to tag drivers
>   dsa: Add TAG protocol to tag ops
>   dsa: Add boilerplate helper to register DSA tag driver modules
>   dsa: Keep link list of tag drivers
>   dsa: Register the none tagger ops
>   dsa: Rename dsa_resolve_tag_protocol() to _get ready for locking
>   dsa: Add stub tag driver put method
>   dsa: Make use of the list of tag drivers
>   dsa: Cleanup unneeded table and make tag structures static
>   dsa: tag_brcm: Avoid unused symbols
>   dsa: Allow tag drivers to be built as modules
> 
>  include/net/dsa.h     | 110 ++++++++++++++++++++++++----
>  net/dsa/Kconfig       |  83 ++++++++++++++++-----
>  net/dsa/Makefile      |  19 +++--
>  net/dsa/dsa.c         | 165 ++++++++++++++++++++++--------------------
>  net/dsa/dsa2.c        |   4 +-
>  net/dsa/dsa_priv.h    |  34 +--------
>  net/dsa/legacy.c      |   4 +-
>  net/dsa/tag_brcm.c    |  41 ++++++++---
>  net/dsa/tag_dsa.c     |  15 ++--
>  net/dsa/tag_edsa.c    |  15 ++--
>  net/dsa/tag_gswip.c   |   9 ++-
>  net/dsa/tag_ksz.c     |  29 ++++++--
>  net/dsa/tag_lan9303.c |  20 +++--
>  net/dsa/tag_mtk.c     |  18 ++---
>  net/dsa/tag_qca.c     |  19 +++--
>  net/dsa/tag_trailer.c |  15 ++--
>  16 files changed, 380 insertions(+), 220 deletions(-)

Nice cleanup at the same time.

Tested-by: Vivien Didelot <vivien.didelot@gmail.com>