summaryrefslogtreecommitdiff
path: root/net/dsa
diff options
context:
space:
mode:
authorClément Léger <clement.leger@bootlin.com>2022-06-24 16:39:48 +0200
committerDavid S. Miller <davem@davemloft.net>2022-06-27 11:37:55 +0100
commita08d6a6dc82036cbd889fe3d53f9c69dc13436eb (patch)
treeb2b653be30df2cfad6689c8c548dd39fc014439f /net/dsa
parent67f38b1c7324a13113e23f7177b1f1c223da3f55 (diff)
net: dsa: add Renesas RZ/N1 switch tag driver
The switch that is present on the Renesas RZ/N1 SoC uses a specific VLAN value followed by 6 bytes which contains forwarding configuration. Signed-off-by: Clément Léger <clement.leger@bootlin.com> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa')
-rw-r--r--net/dsa/Kconfig7
-rw-r--r--net/dsa/Makefile1
-rw-r--r--net/dsa/tag_rzn1_a5psw.c113
3 files changed, 121 insertions, 0 deletions
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index 8cb87b5067ee..63853fff4e2f 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -132,6 +132,13 @@ config NET_DSA_TAG_RTL8_4
Say Y or M if you want to enable support for tagging frames for Realtek
switches with 8 byte protocol 4 tags, such as the Realtek RTL8365MB-VC.
+config NET_DSA_TAG_RZN1_A5PSW
+ tristate "Tag driver for Renesas RZ/N1 A5PSW switch"
+ help
+ Say Y or M if you want to enable support for tagging frames for
+ Renesas RZ/N1 embedded switch that uses an 8 byte tag located after
+ destination MAC address.
+
config NET_DSA_TAG_LAN9303
tristate "Tag driver for SMSC/Microchip LAN9303 family of switches"
help
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index 9f75820e7c98..af28c24ead18 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_NET_DSA_TAG_OCELOT_8021Q) += tag_ocelot_8021q.o
obj-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
obj-$(CONFIG_NET_DSA_TAG_RTL4_A) += tag_rtl4_a.o
obj-$(CONFIG_NET_DSA_TAG_RTL8_4) += tag_rtl8_4.o
+obj-$(CONFIG_NET_DSA_TAG_RZN1_A5PSW) += tag_rzn1_a5psw.o
obj-$(CONFIG_NET_DSA_TAG_SJA1105) += tag_sja1105.o
obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
obj-$(CONFIG_NET_DSA_TAG_XRS700X) += tag_xrs700x.o
diff --git a/net/dsa/tag_rzn1_a5psw.c b/net/dsa/tag_rzn1_a5psw.c
new file mode 100644
index 000000000000..e2a5ee6ae688
--- /dev/null
+++ b/net/dsa/tag_rzn1_a5psw.c
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022 Schneider Electric
+ *
+ * Clément Léger <clement.leger@bootlin.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <net/dsa.h>
+
+#include "dsa_priv.h"
+
+/* To define the outgoing port and to discover the incoming port a TAG is
+ * inserted after Src MAC :
+ *
+ * Dest MAC Src MAC TAG Type
+ * ...| 1 2 3 4 5 6 | 1 2 3 4 5 6 | 1 2 3 4 5 6 7 8 | 1 2 |...
+ * |<--------------->|
+ *
+ * See struct a5psw_tag for layout
+ */
+
+#define ETH_P_DSA_A5PSW 0xE001
+#define A5PSW_TAG_LEN 8
+#define A5PSW_CTRL_DATA_FORCE_FORWARD BIT(0)
+/* This is both used for xmit tag and rcv tagging */
+#define A5PSW_CTRL_DATA_PORT GENMASK(3, 0)
+
+struct a5psw_tag {
+ __be16 ctrl_tag;
+ __be16 ctrl_data;
+ __be16 ctrl_data2_hi;
+ __be16 ctrl_data2_lo;
+};
+
+static struct sk_buff *a5psw_tag_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct dsa_port *dp = dsa_slave_to_port(dev);
+ struct a5psw_tag *ptag;
+ u32 data2_val;
+
+ BUILD_BUG_ON(sizeof(*ptag) != A5PSW_TAG_LEN);
+
+ /* The Ethernet switch we are interfaced with needs packets to be at
+ * least 60 bytes otherwise they will be discarded when they enter the
+ * switch port logic.
+ */
+ if (__skb_put_padto(skb, ETH_ZLEN, false))
+ return NULL;
+
+ /* provide 'A5PSW_TAG_LEN' bytes additional space */
+ skb_push(skb, A5PSW_TAG_LEN);
+
+ /* make room between MACs and Ether-Type to insert tag */
+ dsa_alloc_etype_header(skb, A5PSW_TAG_LEN);
+
+ ptag = dsa_etype_header_pos_tx(skb);
+
+ data2_val = FIELD_PREP(A5PSW_CTRL_DATA_PORT, BIT(dp->index));
+ ptag->ctrl_tag = htons(ETH_P_DSA_A5PSW);
+ ptag->ctrl_data = htons(A5PSW_CTRL_DATA_FORCE_FORWARD);
+ ptag->ctrl_data2_lo = htons(data2_val);
+ ptag->ctrl_data2_hi = 0;
+
+ return skb;
+}
+
+static struct sk_buff *a5psw_tag_rcv(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct a5psw_tag *tag;
+ int port;
+
+ if (unlikely(!pskb_may_pull(skb, A5PSW_TAG_LEN))) {
+ dev_warn_ratelimited(&dev->dev,
+ "Dropping packet, cannot pull\n");
+ return NULL;
+ }
+
+ tag = dsa_etype_header_pos_rx(skb);
+
+ if (tag->ctrl_tag != htons(ETH_P_DSA_A5PSW)) {
+ dev_warn_ratelimited(&dev->dev, "Dropping packet due to invalid TAG marker\n");
+ return NULL;
+ }
+
+ port = FIELD_GET(A5PSW_CTRL_DATA_PORT, ntohs(tag->ctrl_data));
+
+ skb->dev = dsa_master_find_slave(dev, 0, port);
+ if (!skb->dev)
+ return NULL;
+
+ skb_pull_rcsum(skb, A5PSW_TAG_LEN);
+ dsa_strip_etype_header(skb, A5PSW_TAG_LEN);
+
+ dsa_default_offload_fwd_mark(skb);
+
+ return skb;
+}
+
+static const struct dsa_device_ops a5psw_netdev_ops = {
+ .name = "a5psw",
+ .proto = DSA_TAG_PROTO_RZN1_A5PSW,
+ .xmit = a5psw_tag_xmit,
+ .rcv = a5psw_tag_rcv,
+ .needed_headroom = A5PSW_TAG_LEN,
+};
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_A5PSW);
+module_dsa_tag_driver(a5psw_netdev_ops);