diff options
Diffstat (limited to 'net/dsa/tag_edsa.c')
| -rw-r--r-- | net/dsa/tag_edsa.c | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/net/dsa/tag_edsa.c b/net/dsa/tag_edsa.c deleted file mode 100644 index e8eaa804ccb9..000000000000 --- a/net/dsa/tag_edsa.c +++ /dev/null @@ -1,184 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * net/dsa/tag_edsa.c - Ethertype DSA tagging - * Copyright (c) 2008-2009 Marvell Semiconductor - */ - -#include <linux/etherdevice.h> -#include <linux/list.h> -#include <linux/slab.h> - -#include "dsa_priv.h" - -#define DSA_HLEN 4 -#define EDSA_HLEN 8 - -static struct sk_buff *edsa_xmit(struct sk_buff *skb, struct net_device *dev) -{ - struct dsa_port *dp = dsa_slave_to_port(dev); - u8 *edsa_header; - - /* - * Convert the outermost 802.1q tag to a DSA tag and prepend - * a DSA ethertype field is the packet is tagged, or insert - * a DSA ethertype plus DSA tag between the addresses and the - * current ethertype field if the packet is untagged. - */ - if (skb->protocol == htons(ETH_P_8021Q)) { - if (skb_cow_head(skb, DSA_HLEN) < 0) - return NULL; - skb_push(skb, DSA_HLEN); - - memmove(skb->data, skb->data + DSA_HLEN, 2 * ETH_ALEN); - - /* - * Construct tagged FROM_CPU DSA tag from 802.1q tag. - */ - edsa_header = skb->data + 2 * ETH_ALEN; - edsa_header[0] = (ETH_P_EDSA >> 8) & 0xff; - edsa_header[1] = ETH_P_EDSA & 0xff; - edsa_header[2] = 0x00; - edsa_header[3] = 0x00; - edsa_header[4] = 0x60 | dp->ds->index; - edsa_header[5] = dp->index << 3; - - /* - * Move CFI field from byte 6 to byte 5. - */ - if (edsa_header[6] & 0x10) { - edsa_header[5] |= 0x01; - edsa_header[6] &= ~0x10; - } - } else { - if (skb_cow_head(skb, EDSA_HLEN) < 0) - return NULL; - skb_push(skb, EDSA_HLEN); - - memmove(skb->data, skb->data + EDSA_HLEN, 2 * ETH_ALEN); - - /* - * Construct untagged FROM_CPU DSA tag. - */ - edsa_header = skb->data + 2 * ETH_ALEN; - edsa_header[0] = (ETH_P_EDSA >> 8) & 0xff; - edsa_header[1] = ETH_P_EDSA & 0xff; - edsa_header[2] = 0x00; - edsa_header[3] = 0x00; - edsa_header[4] = 0x40 | dp->ds->index; - edsa_header[5] = dp->index << 3; - edsa_header[6] = 0x00; - edsa_header[7] = 0x00; - } - - return skb; -} - -static struct sk_buff *edsa_rcv(struct sk_buff *skb, struct net_device *dev, - struct packet_type *pt) -{ - u8 *edsa_header; - int source_device; - int source_port; - - if (unlikely(!pskb_may_pull(skb, EDSA_HLEN))) - return NULL; - - /* - * Skip the two null bytes after the ethertype. - */ - edsa_header = skb->data + 2; - - /* - * Check that frame type is either TO_CPU or FORWARD. - */ - if ((edsa_header[0] & 0xc0) != 0x00 && (edsa_header[0] & 0xc0) != 0xc0) - return NULL; - - /* - * Determine source device and port. - */ - source_device = edsa_header[0] & 0x1f; - source_port = (edsa_header[1] >> 3) & 0x1f; - - skb->dev = dsa_master_find_slave(dev, source_device, source_port); - if (!skb->dev) - return NULL; - - /* - * If the 'tagged' bit is set, convert the DSA tag to a 802.1q - * tag and delete the ethertype part. If the 'tagged' bit is - * clear, delete the ethertype and the DSA tag parts. - */ - if (edsa_header[0] & 0x20) { - u8 new_header[4]; - - /* - * Insert 802.1q ethertype and copy the VLAN-related - * fields, but clear the bit that will hold CFI (since - * DSA uses that bit location for another purpose). - */ - new_header[0] = (ETH_P_8021Q >> 8) & 0xff; - new_header[1] = ETH_P_8021Q & 0xff; - new_header[2] = edsa_header[2] & ~0x10; - new_header[3] = edsa_header[3]; - - /* - * Move CFI bit from its place in the DSA header to - * its 802.1q-designated place. - */ - if (edsa_header[1] & 0x01) - new_header[2] |= 0x10; - - skb_pull_rcsum(skb, DSA_HLEN); - - /* - * Update packet checksum if skb is CHECKSUM_COMPLETE. - */ - if (skb->ip_summed == CHECKSUM_COMPLETE) { - __wsum c = skb->csum; - c = csum_add(c, csum_partial(new_header + 2, 2, 0)); - c = csum_sub(c, csum_partial(edsa_header + 2, 2, 0)); - skb->csum = c; - } - - memcpy(edsa_header, new_header, DSA_HLEN); - - memmove(skb->data - ETH_HLEN, - skb->data - ETH_HLEN - DSA_HLEN, - 2 * ETH_ALEN); - } else { - /* - * Remove DSA tag and update checksum. - */ - skb_pull_rcsum(skb, EDSA_HLEN); - memmove(skb->data - ETH_HLEN, - skb->data - ETH_HLEN - EDSA_HLEN, - 2 * ETH_ALEN); - } - - skb->offload_fwd_mark = 1; - - return skb; -} - -static int edsa_tag_flow_dissect(const struct sk_buff *skb, __be16 *proto, - int *offset) -{ - *offset = 8; - *proto = ((__be16 *)skb->data)[3]; - return 0; -} - -static 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, - .overhead = EDSA_HLEN, -}; - -MODULE_LICENSE("GPL"); -MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_EDSA); - -module_dsa_tag_driver(edsa_netdev_ops); |