1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright 2019 NXP Semiconductors
4 #include <linux/dsa/ocelot.h>
5 #include <soc/mscc/ocelot.h>
8 static void ocelot_xmit_common(struct sk_buff
*skb
, struct net_device
*netdev
,
9 __be32 ifh_prefix
, void **ifh
)
11 struct dsa_port
*dp
= dsa_slave_to_port(netdev
);
12 struct dsa_switch
*ds
= dp
->ds
;
17 injection
= skb_push(skb
, OCELOT_TAG_LEN
);
18 prefix
= skb_push(skb
, OCELOT_SHORT_PREFIX_LEN
);
21 memset(injection
, 0, OCELOT_TAG_LEN
);
22 ocelot_ifh_set_bypass(injection
, 1);
23 ocelot_ifh_set_src(injection
, ds
->num_ports
);
24 ocelot_ifh_set_qos_class(injection
, skb
->priority
);
26 rew_op
= ocelot_ptp_rew_op(skb
);
28 ocelot_ifh_set_rew_op(injection
, rew_op
);
33 static struct sk_buff
*ocelot_xmit(struct sk_buff
*skb
,
34 struct net_device
*netdev
)
36 struct dsa_port
*dp
= dsa_slave_to_port(netdev
);
39 ocelot_xmit_common(skb
, netdev
, cpu_to_be32(0x8880000a), &injection
);
40 ocelot_ifh_set_dest(injection
, BIT_ULL(dp
->index
));
45 static struct sk_buff
*seville_xmit(struct sk_buff
*skb
,
46 struct net_device
*netdev
)
48 struct dsa_port
*dp
= dsa_slave_to_port(netdev
);
51 ocelot_xmit_common(skb
, netdev
, cpu_to_be32(0x88800005), &injection
);
52 seville_ifh_set_dest(injection
, BIT_ULL(dp
->index
));
57 static struct sk_buff
*ocelot_rcv(struct sk_buff
*skb
,
58 struct net_device
*netdev
,
59 struct packet_type
*pt
)
61 u64 src_port
, qos_class
;
62 u64 vlan_tci
, tag_type
;
63 u8
*start
= skb
->data
;
68 /* Revert skb->data by the amount consumed by the DSA master,
69 * so it points to the beginning of the frame.
71 skb_push(skb
, ETH_HLEN
);
72 /* We don't care about the short prefix, it is just for easy entrance
73 * into the DSA master's RX filter. Discard it now by moving it into
76 skb_pull(skb
, OCELOT_SHORT_PREFIX_LEN
);
77 /* And skb->data now points to the extraction frame header.
78 * Keep a pointer to it.
80 extraction
= skb
->data
;
81 /* Now the EFH is part of the headroom as well */
82 skb_pull(skb
, OCELOT_TAG_LEN
);
83 /* Reset the pointer to the real MAC header */
84 skb_reset_mac_header(skb
);
85 skb_reset_mac_len(skb
);
86 /* And move skb->data to the correct location again */
87 skb_pull(skb
, ETH_HLEN
);
89 /* Remove from inet csum the extraction header */
90 skb_postpull_rcsum(skb
, start
, OCELOT_TOTAL_TAG_LEN
);
92 ocelot_xfh_get_src_port(extraction
, &src_port
);
93 ocelot_xfh_get_qos_class(extraction
, &qos_class
);
94 ocelot_xfh_get_tag_type(extraction
, &tag_type
);
95 ocelot_xfh_get_vlan_tci(extraction
, &vlan_tci
);
97 skb
->dev
= dsa_master_find_slave(netdev
, 0, src_port
);
99 /* The switch will reflect back some frames sent through
100 * sockets opened on the bare DSA master. These will come back
101 * with src_port equal to the index of the CPU port, for which
102 * there is no slave registered. So don't print any error
103 * message here (ignore and drop those frames).
107 skb
->offload_fwd_mark
= 1;
108 skb
->priority
= qos_class
;
110 /* Ocelot switches copy frames unmodified to the CPU. However, it is
111 * possible for the user to request a VLAN modification through
112 * VCAP_IS1_ACT_VID_REPLACE_ENA. In this case, what will happen is that
113 * the VLAN ID field from the Extraction Header gets updated, but the
114 * 802.1Q header does not (the classified VLAN only becomes visible on
115 * egress through the "port tag" of front-panel ports).
116 * So, for traffic extracted by the CPU, we want to pick up the
117 * classified VLAN and manually replace the existing 802.1Q header from
118 * the packet with it, so that the operating system is always up to
119 * date with the result of tc-vlan actions.
120 * NOTE: In VLAN-unaware mode, we don't want to do that, we want the
121 * frame to remain unmodified, because the classified VLAN is always
122 * equal to the pvid of the ingress port and should not be used for
125 dp
= dsa_slave_to_port(skb
->dev
);
126 vlan_tpid
= tag_type
? ETH_P_8021AD
: ETH_P_8021Q
;
128 if (dsa_port_is_vlan_filtering(dp
) &&
129 eth_hdr(skb
)->h_proto
== htons(vlan_tpid
)) {
132 skb_push_rcsum(skb
, ETH_HLEN
);
133 __skb_vlan_pop(skb
, &dummy_vlan_tci
);
134 skb_pull_rcsum(skb
, ETH_HLEN
);
135 __vlan_hwaccel_put_tag(skb
, htons(vlan_tpid
), vlan_tci
);
141 static const struct dsa_device_ops ocelot_netdev_ops
= {
143 .proto
= DSA_TAG_PROTO_OCELOT
,
146 .overhead
= OCELOT_TOTAL_TAG_LEN
,
147 .promisc_on_master
= true,
150 DSA_TAG_DRIVER(ocelot_netdev_ops
);
151 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT
);
153 static const struct dsa_device_ops seville_netdev_ops
= {
155 .proto
= DSA_TAG_PROTO_SEVILLE
,
156 .xmit
= seville_xmit
,
158 .overhead
= OCELOT_TOTAL_TAG_LEN
,
159 .promisc_on_master
= true,
162 DSA_TAG_DRIVER(seville_netdev_ops
);
163 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SEVILLE
);
165 static struct dsa_tag_driver
*ocelot_tag_driver_array
[] = {
166 &DSA_TAG_DRIVER_NAME(ocelot_netdev_ops
),
167 &DSA_TAG_DRIVER_NAME(seville_netdev_ops
),
170 module_dsa_tag_drivers(ocelot_tag_driver_array
);
172 MODULE_LICENSE("GPL v2");