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230 lines
10 KiB
C
230 lines
10 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright 2019 NXP Semiconductors
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*/
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#include <soc/mscc/ocelot.h>
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#include <linux/packing.h>
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#include "dsa_priv.h"
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/* The CPU injection header and the CPU extraction header can have 3 types of
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* prefixes: long, short and no prefix. The format of the header itself is the
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* same in all 3 cases.
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*
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* Extraction with long prefix:
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*
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* +-------------------+-------------------+------+------+------------+-------+
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* | ff:ff:ff:ff:ff:ff | ff:ff:ff:ff:ff:ff | 8880 | 000a | extraction | frame |
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* | | | | | header | |
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* +-------------------+-------------------+------+------+------------+-------+
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* 48 bits 48 bits 16 bits 16 bits 128 bits
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*
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* Extraction with short prefix:
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*
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* +------+------+------------+-------+
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* | 8880 | 000a | extraction | frame |
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* | | | header | |
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* +------+------+------------+-------+
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* 16 bits 16 bits 128 bits
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*
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* Extraction with no prefix:
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*
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* +------------+-------+
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* | extraction | frame |
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* | header | |
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* +------------+-------+
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* 128 bits
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*
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*
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* Injection with long prefix:
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*
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* +-------------------+-------------------+------+------+------------+-------+
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* | any dmac | any smac | 8880 | 000a | injection | frame |
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* | | | | | header | |
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* +-------------------+-------------------+------+------+------------+-------+
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* 48 bits 48 bits 16 bits 16 bits 128 bits
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*
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* Injection with short prefix:
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*
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* +------+------+------------+-------+
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* | 8880 | 000a | injection | frame |
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* | | | header | |
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* +------+------+------------+-------+
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* 16 bits 16 bits 128 bits
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*
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* Injection with no prefix:
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*
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* +------------+-------+
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* | injection | frame |
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* | header | |
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* +------------+-------+
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* 128 bits
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*
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* The injection header looks like this (network byte order, bit 127
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* is part of lowest address byte in memory, bit 0 is part of highest
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* address byte):
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*
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* +------+------+------+------+------+------+------+------+
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* 127:120 |BYPASS| MASQ | MASQ_PORT |REW_OP|REW_OP|
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* +------+------+------+------+------+------+------+------+
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* 119:112 | REW_OP |
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* +------+------+------+------+------+------+------+------+
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* 111:104 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 103: 96 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 95: 88 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 87: 80 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 79: 72 | RSV |
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* +------+------+------+------+------+------+------+------+
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* 71: 64 | RSV | DEST |
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* +------+------+------+------+------+------+------+------+
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* 63: 56 | DEST |
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* +------+------+------+------+------+------+------+------+
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* 55: 48 | RSV |
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* +------+------+------+------+------+------+------+------+
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* 47: 40 | RSV | SRC_PORT | RSV |TFRM_TIMER|
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* +------+------+------+------+------+------+------+------+
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* 39: 32 | TFRM_TIMER | RSV |
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* +------+------+------+------+------+------+------+------+
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* 31: 24 | RSV | DP | POP_CNT | CPUQ |
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* +------+------+------+------+------+------+------+------+
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* 23: 16 | CPUQ | QOS_CLASS |TAG_TYPE|
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* +------+------+------+------+------+------+------+------+
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* 15: 8 | PCP | DEI | VID |
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* +------+------+------+------+------+------+------+------+
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* 7: 0 | VID |
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* +------+------+------+------+------+------+------+------+
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*
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* And the extraction header looks like this:
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*
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* +------+------+------+------+------+------+------+------+
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* 127:120 | RSV | REW_OP |
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* +------+------+------+------+------+------+------+------+
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* 119:112 | REW_OP | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 111:104 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 103: 96 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 95: 88 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 87: 80 | REW_VAL | LLEN |
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* +------+------+------+------+------+------+------+------+
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* 79: 72 | LLEN | WLEN |
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* +------+------+------+------+------+------+------+------+
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* 71: 64 | WLEN | RSV |
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* +------+------+------+------+------+------+------+------+
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* 63: 56 | RSV |
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* +------+------+------+------+------+------+------+------+
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* 55: 48 | RSV |
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* +------+------+------+------+------+------+------+------+
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* 47: 40 | RSV | SRC_PORT | ACL_ID |
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* +------+------+------+------+------+------+------+------+
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* 39: 32 | ACL_ID | RSV | SFLOW_ID |
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* +------+------+------+------+------+------+------+------+
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* 31: 24 |ACL_HIT| DP | LRN_FLAGS | CPUQ |
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* +------+------+------+------+------+------+------+------+
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* 23: 16 | CPUQ | QOS_CLASS |TAG_TYPE|
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* +------+------+------+------+------+------+------+------+
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* 15: 8 | PCP | DEI | VID |
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* +------+------+------+------+------+------+------+------+
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* 7: 0 | VID |
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* +------+------+------+------+------+------+------+------+
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*/
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static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
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struct net_device *netdev)
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{
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struct dsa_port *dp = dsa_slave_to_port(netdev);
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u64 bypass, dest, src, qos_class;
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struct dsa_switch *ds = dp->ds;
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int port = dp->index;
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u8 *injection;
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if (unlikely(skb_cow_head(skb, OCELOT_TAG_LEN) < 0)) {
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netdev_err(netdev, "Cannot make room for tag.\n");
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return NULL;
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}
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injection = skb_push(skb, OCELOT_TAG_LEN);
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memset(injection, 0, OCELOT_TAG_LEN);
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src = dsa_upstream_port(ds, port);
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dest = BIT(port);
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bypass = true;
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qos_class = skb->priority;
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packing(injection, &bypass, 127, 127, OCELOT_TAG_LEN, PACK, 0);
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packing(injection, &dest, 68, 56, OCELOT_TAG_LEN, PACK, 0);
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packing(injection, &src, 46, 43, OCELOT_TAG_LEN, PACK, 0);
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packing(injection, &qos_class, 19, 17, OCELOT_TAG_LEN, PACK, 0);
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return skb;
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}
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static struct sk_buff *ocelot_rcv(struct sk_buff *skb,
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struct net_device *netdev,
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struct packet_type *pt)
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{
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u64 src_port, qos_class;
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u8 *start = skb->data;
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u8 *extraction;
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/* Revert skb->data by the amount consumed by the DSA master,
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* so it points to the beginning of the frame.
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*/
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skb_push(skb, ETH_HLEN);
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/* We don't care about the long prefix, it is just for easy entrance
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* into the DSA master's RX filter. Discard it now by moving it into
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* the headroom.
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*/
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skb_pull(skb, OCELOT_LONG_PREFIX_LEN);
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/* And skb->data now points to the extraction frame header.
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* Keep a pointer to it.
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*/
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extraction = skb->data;
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/* Now the EFH is part of the headroom as well */
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skb_pull(skb, OCELOT_TAG_LEN);
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/* Reset the pointer to the real MAC header */
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skb_reset_mac_header(skb);
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skb_reset_mac_len(skb);
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/* And move skb->data to the correct location again */
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skb_pull(skb, ETH_HLEN);
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/* Remove from inet csum the extraction header */
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skb_postpull_rcsum(skb, start, OCELOT_LONG_PREFIX_LEN + OCELOT_TAG_LEN);
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packing(extraction, &src_port, 46, 43, OCELOT_TAG_LEN, UNPACK, 0);
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packing(extraction, &qos_class, 19, 17, OCELOT_TAG_LEN, UNPACK, 0);
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skb->dev = dsa_master_find_slave(netdev, 0, src_port);
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if (!skb->dev)
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/* The switch will reflect back some frames sent through
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* sockets opened on the bare DSA master. These will come back
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* with src_port equal to the index of the CPU port, for which
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* there is no slave registered. So don't print any error
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* message here (ignore and drop those frames).
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*/
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return NULL;
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skb->offload_fwd_mark = 1;
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skb->priority = qos_class;
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return skb;
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}
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static struct dsa_device_ops ocelot_netdev_ops = {
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.name = "ocelot",
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.proto = DSA_TAG_PROTO_OCELOT,
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.xmit = ocelot_xmit,
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.rcv = ocelot_rcv,
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.overhead = OCELOT_TAG_LEN + OCELOT_LONG_PREFIX_LEN,
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};
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT);
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module_dsa_tag_driver(ocelot_netdev_ops);
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