[linux-2.6-block.git] / net / dsa / tag_ocelot.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 NXP
 */
#include <linux/dsa/ocelot.h>

#include "tag.h"

#define OCELOT_NAME	"ocelot"
#define SEVILLE_NAME	"seville"

/* If the port is under a VLAN-aware bridge, remove the VLAN header from the
 * payload and move it into the DSA tag, which will make the switch classify
 * the packet to the bridge VLAN. Otherwise, leave the classified VLAN at zero,
 * which is the pvid of standalone and VLAN-unaware bridge ports.
 */
static void ocelot_xmit_get_vlan_info(struct sk_buff *skb, struct dsa_port *dp,
				      u64 *vlan_tci, u64 *tag_type)
{
	struct net_device *br = dsa_port_bridge_dev_get(dp);
	struct vlan_ethhdr *hdr;
	u16 proto, tci;

	if (!br || !br_vlan_enabled(br)) {
		*vlan_tci = 0;
		*tag_type = IFH_TAG_TYPE_C;
		return;
	}

	hdr = skb_vlan_eth_hdr(skb);
	br_vlan_get_proto(br, &proto);

	if (ntohs(hdr->h_vlan_proto) == proto) {
		vlan_remove_tag(skb, &tci);
		*vlan_tci = tci;
	} else {
		rcu_read_lock();
		br_vlan_get_pvid_rcu(br, &tci);
		rcu_read_unlock();
		*vlan_tci = tci;
	}

	*tag_type = (proto != ETH_P_8021Q) ? IFH_TAG_TYPE_S : IFH_TAG_TYPE_C;
}

static void ocelot_xmit_common(struct sk_buff *skb, struct net_device *netdev,
			       __be32 ifh_prefix, void **ifh)
{
	struct dsa_port *dp = dsa_slave_to_port(netdev);
	struct dsa_switch *ds = dp->ds;
	u64 vlan_tci, tag_type;
	void *injection;
	__be32 *prefix;
	u32 rew_op = 0;
	u64 qos_class;

	ocelot_xmit_get_vlan_info(skb, dp, &vlan_tci, &tag_type);

	qos_class = netdev_get_num_tc(netdev) ?
		    netdev_get_prio_tc_map(netdev, skb->priority) : skb->priority;

	injection = skb_push(skb, OCELOT_TAG_LEN);
	prefix = skb_push(skb, OCELOT_SHORT_PREFIX_LEN);

	*prefix = ifh_prefix;
	memset(injection, 0, OCELOT_TAG_LEN);
	ocelot_ifh_set_bypass(injection, 1);
	ocelot_ifh_set_src(injection, ds->num_ports);
	ocelot_ifh_set_qos_class(injection, qos_class);
	ocelot_ifh_set_vlan_tci(injection, vlan_tci);
	ocelot_ifh_set_tag_type(injection, tag_type);

	rew_op = ocelot_ptp_rew_op(skb);
	if (rew_op)
		ocelot_ifh_set_rew_op(injection, rew_op);

	*ifh = injection;
}

static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
				   struct net_device *netdev)
{
	struct dsa_port *dp = dsa_slave_to_port(netdev);
	void *injection;

	ocelot_xmit_common(skb, netdev, cpu_to_be32(0x8880000a), &injection);
	ocelot_ifh_set_dest(injection, BIT_ULL(dp->index));

	return skb;
}

static struct sk_buff *seville_xmit(struct sk_buff *skb,
				    struct net_device *netdev)
{
	struct dsa_port *dp = dsa_slave_to_port(netdev);
	void *injection;

	ocelot_xmit_common(skb, netdev, cpu_to_be32(0x88800005), &injection);
	seville_ifh_set_dest(injection, BIT_ULL(dp->index));

	return skb;
}

static struct sk_buff *ocelot_rcv(struct sk_buff *skb,
				  struct net_device *netdev)
{
	u64 src_port, qos_class;
	u64 vlan_tci, tag_type;
	u8 *start = skb->data;
	struct dsa_port *dp;
	u8 *extraction;
	u16 vlan_tpid;
	u64 rew_val;

	/* Revert skb->data by the amount consumed by the DSA master,
	 * so it points to the beginning of the frame.
	 */
	skb_push(skb, ETH_HLEN);
	/* We don't care about the short prefix, it is just for easy entrance
	 * into the DSA master's RX filter. Discard it now by moving it into
	 * the headroom.
	 */
	skb_pull(skb, OCELOT_SHORT_PREFIX_LEN);
	/* And skb->data now points to the extraction frame header.
	 * Keep a pointer to it.
	 */
	extraction = skb->data;
	/* Now the EFH is part of the headroom as well */
	skb_pull(skb, OCELOT_TAG_LEN);
	/* Reset the pointer to the real MAC header */
	skb_reset_mac_header(skb);
	skb_reset_mac_len(skb);
	/* And move skb->data to the correct location again */
	skb_pull(skb, ETH_HLEN);

	/* Remove from inet csum the extraction header */
	skb_postpull_rcsum(skb, start, OCELOT_TOTAL_TAG_LEN);

	ocelot_xfh_get_src_port(extraction, &src_port);
	ocelot_xfh_get_qos_class(extraction, &qos_class);
	ocelot_xfh_get_tag_type(extraction, &tag_type);
	ocelot_xfh_get_vlan_tci(extraction, &vlan_tci);
	ocelot_xfh_get_rew_val(extraction, &rew_val);

	skb->dev = dsa_master_find_slave(netdev, 0, src_port);
	if (!skb->dev)
		/* The switch will reflect back some frames sent through
		 * sockets opened on the bare DSA master. These will come back
		 * with src_port equal to the index of the CPU port, for which
		 * there is no slave registered. So don't print any error
		 * message here (ignore and drop those frames).
		 */
		return NULL;

	dsa_default_offload_fwd_mark(skb);
	skb->priority = qos_class;
	OCELOT_SKB_CB(skb)->tstamp_lo = rew_val;

	/* Ocelot switches copy frames unmodified to the CPU. However, it is
	 * possible for the user to request a VLAN modification through
	 * VCAP_IS1_ACT_VID_REPLACE_ENA. In this case, what will happen is that
	 * the VLAN ID field from the Extraction Header gets updated, but the
	 * 802.1Q header does not (the classified VLAN only becomes visible on
	 * egress through the "port tag" of front-panel ports).
	 * So, for traffic extracted by the CPU, we want to pick up the
	 * classified VLAN and manually replace the existing 802.1Q header from
	 * the packet with it, so that the operating system is always up to
	 * date with the result of tc-vlan actions.
	 * NOTE: In VLAN-unaware mode, we don't want to do that, we want the
	 * frame to remain unmodified, because the classified VLAN is always
	 * equal to the pvid of the ingress port and should not be used for
	 * processing.
	 */
	dp = dsa_slave_to_port(skb->dev);
	vlan_tpid = tag_type ? ETH_P_8021AD : ETH_P_8021Q;

	if (dsa_port_is_vlan_filtering(dp) &&
	    eth_hdr(skb)->h_proto == htons(vlan_tpid)) {
		u16 dummy_vlan_tci;

		skb_push_rcsum(skb, ETH_HLEN);
		__skb_vlan_pop(skb, &dummy_vlan_tci);
		skb_pull_rcsum(skb, ETH_HLEN);
		__vlan_hwaccel_put_tag(skb, htons(vlan_tpid), vlan_tci);
	}

	return skb;
}

static const struct dsa_device_ops ocelot_netdev_ops = {
	.name			= OCELOT_NAME,
	.proto			= DSA_TAG_PROTO_OCELOT,
	.xmit			= ocelot_xmit,
	.rcv			= ocelot_rcv,
	.needed_headroom	= OCELOT_TOTAL_TAG_LEN,
	.promisc_on_master	= true,
};

DSA_TAG_DRIVER(ocelot_netdev_ops);
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT, OCELOT_NAME);

static const struct dsa_device_ops seville_netdev_ops = {
	.name			= SEVILLE_NAME,
	.proto			= DSA_TAG_PROTO_SEVILLE,
	.xmit			= seville_xmit,
	.rcv			= ocelot_rcv,
	.needed_headroom	= OCELOT_TOTAL_TAG_LEN,
	.promisc_on_master	= true,
};

DSA_TAG_DRIVER(seville_netdev_ops);
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SEVILLE, SEVILLE_NAME);

static struct dsa_tag_driver *ocelot_tag_driver_array[] = {
	&DSA_TAG_DRIVER_NAME(ocelot_netdev_ops),
	&DSA_TAG_DRIVER_NAME(seville_netdev_ops),
};

module_dsa_tag_drivers(ocelot_tag_driver_array);

MODULE_LICENSE("GPL v2");
Commit	Line	Data
8dce89aa	1	// SPDX-License-Identifier: GPL-2.0
3c9cfb52	2	/* Copyright 2019 NXP
8dce89aa	3	*/
40d3f295	4	#include <linux/dsa/ocelot.h>
bd954b82 VO	5
bd954b82 VO	6	#include "tag.h"
8dce89aa	7
94793a56 VO	8	#define OCELOT_NAME "ocelot"
	9	#define SEVILLE_NAME "seville"
	10
5ca721c5 VO	11	/* If the port is under a VLAN-aware bridge, remove the VLAN header from the
	12	* payload and move it into the DSA tag, which will make the switch classify
	13	* the packet to the bridge VLAN. Otherwise, leave the classified VLAN at zero,
	14	* which is the pvid of standalone and VLAN-unaware bridge ports.
	15	*/
	16	static void ocelot_xmit_get_vlan_info(struct sk_buff skb, struct dsa_port dp,
	17	u64 vlan_tci, u64 tag_type)
	18	{
36cbf39b	19	struct net_device *br = dsa_port_bridge_dev_get(dp);
5ca721c5 VO	20	struct vlan_ethhdr *hdr;
	21	u16 proto, tci;
	22
	23	if (!br \|\| !br_vlan_enabled(br)) {
	24	*vlan_tci = 0;
	25	*tag_type = IFH_TAG_TYPE_C;
	26	return;
	27	}
	28
eabb1494	29	hdr = skb_vlan_eth_hdr(skb);
5ca721c5 VO	30	br_vlan_get_proto(br, &proto);
	31
	32	if (ntohs(hdr->h_vlan_proto) == proto) {
0bcf2e4a	33	vlan_remove_tag(skb, &tci);
5ca721c5 VO	34	*vlan_tci = tci;
	35	} else {
	36	rcu_read_lock();
	37	br_vlan_get_pvid_rcu(br, &tci);
	38	rcu_read_unlock();
	39	*vlan_tci = tci;
	40	}
	41
	42	*tag_type = (proto != ETH_P_8021Q) ? IFH_TAG_TYPE_S : IFH_TAG_TYPE_C;
	43	}
	44
7c4bb540 VO	45	static void ocelot_xmit_common(struct sk_buff skb, struct net_device netdev,
7c4bb540 VO	46	__be32 ifh_prefix, void **ifh)
8dce89aa VO	47	{
8dce89aa VO	48	struct dsa_port *dp = dsa_slave_to_port(netdev);
8dce89aa	49	struct dsa_switch *ds = dp->ds;
5ca721c5	50	u64 vlan_tci, tag_type;
7c4bb540 VO	51	void *injection;
7c4bb540 VO	52	__be32 *prefix;
39e5308b	53	u32 rew_op = 0;
ae2778a6	54	u64 qos_class;
8dce89aa	55
5ca721c5 VO	56	ocelot_xmit_get_vlan_info(skb, dp, &vlan_tci, &tag_type);
5ca721c5 VO	57
ae2778a6 XY	58	qos_class = netdev_get_num_tc(netdev) ?
	59	netdev_get_prio_tc_map(netdev, skb->priority) : skb->priority;
	60
67c24049	61	injection = skb_push(skb, OCELOT_TAG_LEN);
5124197c VO	62	prefix = skb_push(skb, OCELOT_SHORT_PREFIX_LEN);
5124197c VO	63
7c4bb540 VO	64	*prefix = ifh_prefix;
	65	memset(injection, 0, OCELOT_TAG_LEN);
	66	ocelot_ifh_set_bypass(injection, 1);
	67	ocelot_ifh_set_src(injection, ds->num_ports);
ae2778a6	68	ocelot_ifh_set_qos_class(injection, qos_class);
5ca721c5 VO	69	ocelot_ifh_set_vlan_tci(injection, vlan_tci);
5ca721c5 VO	70	ocelot_ifh_set_tag_type(injection, tag_type);
8dce89aa	71
39e5308b YL	72	rew_op = ocelot_ptp_rew_op(skb);
	73	if (rew_op)
	74	ocelot_ifh_set_rew_op(injection, rew_op);
c0bcf537	75
7c4bb540 VO	76	*ifh = injection;
	77	}
	78
	79	static struct sk_buff ocelot_xmit(struct sk_buff skb,
	80	struct net_device *netdev)
	81	{
	82	struct dsa_port *dp = dsa_slave_to_port(netdev);
	83	void *injection;
	84
	85	ocelot_xmit_common(skb, netdev, cpu_to_be32(0x8880000a), &injection);
1f778d50	86	ocelot_ifh_set_dest(injection, BIT_ULL(dp->index));
7c4bb540 VO	87
	88	return skb;
	89	}
	90
	91	static struct sk_buff seville_xmit(struct sk_buff skb,
	92	struct net_device *netdev)
	93	{
	94	struct dsa_port *dp = dsa_slave_to_port(netdev);
	95	void *injection;
	96
	97	ocelot_xmit_common(skb, netdev, cpu_to_be32(0x88800005), &injection);
1f778d50	98	seville_ifh_set_dest(injection, BIT_ULL(dp->index));
7c4bb540	99
8dce89aa VO	100	return skb;
	101	}
	102
	103	static struct sk_buff ocelot_rcv(struct sk_buff skb,
29a097b7	104	struct net_device *netdev)
8dce89aa VO	105	{
8dce89aa VO	106	u64 src_port, qos_class;
ea440cd2	107	u64 vlan_tci, tag_type;
8dce89aa	108	u8 *start = skb->data;
8a678bb2	109	struct dsa_port *dp;
8dce89aa	110	u8 *extraction;
ea440cd2	111	u16 vlan_tpid;
92f62485	112	u64 rew_val;
8dce89aa VO	113
	114	/* Revert skb->data by the amount consumed by the DSA master,
	115	* so it points to the beginning of the frame.
	116	*/
	117	skb_push(skb, ETH_HLEN);
5124197c	118	/* We don't care about the short prefix, it is just for easy entrance
8dce89aa VO	119	* into the DSA master's RX filter. Discard it now by moving it into
	120	* the headroom.
	121	*/
5124197c	122	skb_pull(skb, OCELOT_SHORT_PREFIX_LEN);
8dce89aa VO	123	/* And skb->data now points to the extraction frame header.
	124	* Keep a pointer to it.
	125	*/
	126	extraction = skb->data;
	127	/* Now the EFH is part of the headroom as well */
	128	skb_pull(skb, OCELOT_TAG_LEN);
	129	/* Reset the pointer to the real MAC header */
	130	skb_reset_mac_header(skb);
	131	skb_reset_mac_len(skb);
	132	/* And move skb->data to the correct location again */
	133	skb_pull(skb, ETH_HLEN);
	134
	135	/* Remove from inet csum the extraction header */
5124197c	136	skb_postpull_rcsum(skb, start, OCELOT_TOTAL_TAG_LEN);
8dce89aa	137
40d3f295 VO	138	ocelot_xfh_get_src_port(extraction, &src_port);
	139	ocelot_xfh_get_qos_class(extraction, &qos_class);
	140	ocelot_xfh_get_tag_type(extraction, &tag_type);
	141	ocelot_xfh_get_vlan_tci(extraction, &vlan_tci);
92f62485	142	ocelot_xfh_get_rew_val(extraction, &rew_val);
8dce89aa VO	143
	144	skb->dev = dsa_master_find_slave(netdev, 0, src_port);
	145	if (!skb->dev)
	146	/* The switch will reflect back some frames sent through
	147	* sockets opened on the bare DSA master. These will come back
	148	* with src_port equal to the index of the CPU port, for which
	149	* there is no slave registered. So don't print any error
	150	* message here (ignore and drop those frames).
	151	*/
	152	return NULL;
	153
bea79078	154	dsa_default_offload_fwd_mark(skb);
8dce89aa	155	skb->priority = qos_class;
92f62485	156	OCELOT_SKB_CB(skb)->tstamp_lo = rew_val;
8dce89aa	157
ea440cd2 VO	158	/* Ocelot switches copy frames unmodified to the CPU. However, it is
	159	* possible for the user to request a VLAN modification through
	160	* VCAP_IS1_ACT_VID_REPLACE_ENA. In this case, what will happen is that
	161	* the VLAN ID field from the Extraction Header gets updated, but the
	162	* 802.1Q header does not (the classified VLAN only becomes visible on
	163	* egress through the "port tag" of front-panel ports).
	164	* So, for traffic extracted by the CPU, we want to pick up the
	165	* classified VLAN and manually replace the existing 802.1Q header from
	166	* the packet with it, so that the operating system is always up to
	167	* date with the result of tc-vlan actions.
	168	* NOTE: In VLAN-unaware mode, we don't want to do that, we want the
	169	* frame to remain unmodified, because the classified VLAN is always
	170	* equal to the pvid of the ingress port and should not be used for
	171	* processing.
	172	*/
8a678bb2	173	dp = dsa_slave_to_port(skb->dev);
ea440cd2 VO	174	vlan_tpid = tag_type ? ETH_P_8021AD : ETH_P_8021Q;
ea440cd2 VO	175
8a678bb2	176	if (dsa_port_is_vlan_filtering(dp) &&
ea440cd2 VO	177	eth_hdr(skb)->h_proto == htons(vlan_tpid)) {
	178	u16 dummy_vlan_tci;
	179
	180	skb_push_rcsum(skb, ETH_HLEN);
	181	__skb_vlan_pop(skb, &dummy_vlan_tci);
	182	skb_pull_rcsum(skb, ETH_HLEN);
	183	__vlan_hwaccel_put_tag(skb, htons(vlan_tpid), vlan_tci);
	184	}
	185
8dce89aa VO	186	return skb;
	187	}
	188
2fa3888b	189	static const struct dsa_device_ops ocelot_netdev_ops = {
94793a56	190	.name = OCELOT_NAME,
8dce89aa VO	191	.proto = DSA_TAG_PROTO_OCELOT,
	192	.xmit = ocelot_xmit,
	193	.rcv = ocelot_rcv,
4e500251	194	.needed_headroom = OCELOT_TOTAL_TAG_LEN,
5124197c	195	.promisc_on_master = true,
8dce89aa VO	196	};
8dce89aa VO	197
7c4bb540	198	DSA_TAG_DRIVER(ocelot_netdev_ops);
94793a56	199	MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT, OCELOT_NAME);
8dce89aa	200
7c4bb540	201	static const struct dsa_device_ops seville_netdev_ops = {
94793a56	202	.name = SEVILLE_NAME,
7c4bb540 VO	203	.proto = DSA_TAG_PROTO_SEVILLE,
	204	.xmit = seville_xmit,
	205	.rcv = ocelot_rcv,
4e500251	206	.needed_headroom = OCELOT_TOTAL_TAG_LEN,
7c4bb540 VO	207	.promisc_on_master = true,
	208	};
	209
	210	DSA_TAG_DRIVER(seville_netdev_ops);
94793a56	211	MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SEVILLE, SEVILLE_NAME);
7c4bb540 VO	212
	213	static struct dsa_tag_driver *ocelot_tag_driver_array[] = {
	214	&DSA_TAG_DRIVER_NAME(ocelot_netdev_ops),
	215	&DSA_TAG_DRIVER_NAME(seville_netdev_ops),
	216	};
	217
	218	module_dsa_tag_drivers(ocelot_tag_driver_array);
	219
	220	MODULE_LICENSE("GPL v2");