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78be9217c4
For a switch to offload insertion of HSR/PRP tags, frames must not be sent to the CPU facing switch port with a tag. Generate supervision frames (eth type ETH_P_PRP) without HSR v1 (ETH_P_HSR)/PRP tag and rely on create_tagged_frame which inserts it later. This will allow skipping the tag insertion for all outgoing frames in the future which is required for HSR v1/PRP tag insertions to be offloaded. HSR v0 supervision frames always contain tag information so insertion of the tag can't be offloaded. IEC 62439-3 Ed.2.0 (HSR v1) specifically notes that this was changed since v0 to allow offloading. Signed-off-by: George McCollister <george.mccollister@gmail.com> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Tested-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
565 lines
15 KiB
C
565 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright 2011-2014 Autronica Fire and Security AS
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*
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* Author(s):
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* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
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*
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* Frame router for HSR and PRP.
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*/
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#include "hsr_forward.h"
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/etherdevice.h>
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#include <linux/if_vlan.h>
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#include "hsr_main.h"
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#include "hsr_framereg.h"
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struct hsr_node;
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/* The uses I can see for these HSR supervision frames are:
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* 1) Use the frames that are sent after node initialization ("HSR_TLV.Type =
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* 22") to reset any sequence_nr counters belonging to that node. Useful if
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* the other node's counter has been reset for some reason.
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* --
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* Or not - resetting the counter and bridging the frame would create a
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* loop, unfortunately.
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*
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* 2) Use the LifeCheck frames to detect ring breaks. I.e. if no LifeCheck
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* frame is received from a particular node, we know something is wrong.
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* We just register these (as with normal frames) and throw them away.
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*
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* 3) Allow different MAC addresses for the two slave interfaces, using the
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* MacAddressA field.
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*/
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static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
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{
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struct ethhdr *eth_hdr;
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struct hsr_sup_tag *hsr_sup_tag;
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struct hsrv1_ethhdr_sp *hsr_V1_hdr;
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WARN_ON_ONCE(!skb_mac_header_was_set(skb));
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eth_hdr = (struct ethhdr *)skb_mac_header(skb);
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/* Correct addr? */
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if (!ether_addr_equal(eth_hdr->h_dest,
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hsr->sup_multicast_addr))
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return false;
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/* Correct ether type?. */
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if (!(eth_hdr->h_proto == htons(ETH_P_PRP) ||
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eth_hdr->h_proto == htons(ETH_P_HSR)))
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return false;
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/* Get the supervision header from correct location. */
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if (eth_hdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */
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hsr_V1_hdr = (struct hsrv1_ethhdr_sp *)skb_mac_header(skb);
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if (hsr_V1_hdr->hsr.encap_proto != htons(ETH_P_PRP))
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return false;
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hsr_sup_tag = &hsr_V1_hdr->hsr_sup;
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} else {
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hsr_sup_tag =
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&((struct hsrv0_ethhdr_sp *)skb_mac_header(skb))->hsr_sup;
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}
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if (hsr_sup_tag->HSR_TLV_type != HSR_TLV_ANNOUNCE &&
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hsr_sup_tag->HSR_TLV_type != HSR_TLV_LIFE_CHECK &&
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hsr_sup_tag->HSR_TLV_type != PRP_TLV_LIFE_CHECK_DD &&
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hsr_sup_tag->HSR_TLV_type != PRP_TLV_LIFE_CHECK_DA)
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return false;
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if (hsr_sup_tag->HSR_TLV_length != 12 &&
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hsr_sup_tag->HSR_TLV_length != sizeof(struct hsr_sup_payload))
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return false;
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return true;
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}
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static struct sk_buff *create_stripped_skb_hsr(struct sk_buff *skb_in,
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struct hsr_frame_info *frame)
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{
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struct sk_buff *skb;
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int copylen;
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unsigned char *dst, *src;
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skb_pull(skb_in, HSR_HLEN);
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skb = __pskb_copy(skb_in, skb_headroom(skb_in) - HSR_HLEN, GFP_ATOMIC);
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skb_push(skb_in, HSR_HLEN);
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if (!skb)
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return NULL;
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skb_reset_mac_header(skb);
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if (skb->ip_summed == CHECKSUM_PARTIAL)
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skb->csum_start -= HSR_HLEN;
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copylen = 2 * ETH_ALEN;
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if (frame->is_vlan)
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copylen += VLAN_HLEN;
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src = skb_mac_header(skb_in);
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dst = skb_mac_header(skb);
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memcpy(dst, src, copylen);
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skb->protocol = eth_hdr(skb)->h_proto;
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return skb;
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}
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struct sk_buff *hsr_get_untagged_frame(struct hsr_frame_info *frame,
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struct hsr_port *port)
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{
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if (!frame->skb_std) {
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if (frame->skb_hsr) {
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frame->skb_std =
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create_stripped_skb_hsr(frame->skb_hsr, frame);
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} else {
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/* Unexpected */
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WARN_ONCE(1, "%s:%d: Unexpected frame received (port_src %s)\n",
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__FILE__, __LINE__, port->dev->name);
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return NULL;
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}
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}
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return skb_clone(frame->skb_std, GFP_ATOMIC);
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}
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struct sk_buff *prp_get_untagged_frame(struct hsr_frame_info *frame,
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struct hsr_port *port)
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{
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if (!frame->skb_std) {
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if (frame->skb_prp) {
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/* trim the skb by len - HSR_HLEN to exclude RCT */
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skb_trim(frame->skb_prp,
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frame->skb_prp->len - HSR_HLEN);
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frame->skb_std =
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__pskb_copy(frame->skb_prp,
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skb_headroom(frame->skb_prp),
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GFP_ATOMIC);
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} else {
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/* Unexpected */
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WARN_ONCE(1, "%s:%d: Unexpected frame received (port_src %s)\n",
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__FILE__, __LINE__, port->dev->name);
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return NULL;
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}
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}
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return skb_clone(frame->skb_std, GFP_ATOMIC);
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}
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static void prp_set_lan_id(struct prp_rct *trailer,
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struct hsr_port *port)
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{
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int lane_id;
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if (port->type == HSR_PT_SLAVE_A)
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lane_id = 0;
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else
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lane_id = 1;
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/* Add net_id in the upper 3 bits of lane_id */
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lane_id |= port->hsr->net_id;
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set_prp_lan_id(trailer, lane_id);
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}
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/* Tailroom for PRP rct should have been created before calling this */
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static struct sk_buff *prp_fill_rct(struct sk_buff *skb,
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struct hsr_frame_info *frame,
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struct hsr_port *port)
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{
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struct prp_rct *trailer;
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int min_size = ETH_ZLEN;
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int lsdu_size;
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if (!skb)
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return skb;
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if (frame->is_vlan)
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min_size = VLAN_ETH_ZLEN;
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if (skb_put_padto(skb, min_size))
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return NULL;
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trailer = (struct prp_rct *)skb_put(skb, HSR_HLEN);
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lsdu_size = skb->len - 14;
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if (frame->is_vlan)
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lsdu_size -= 4;
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prp_set_lan_id(trailer, port);
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set_prp_LSDU_size(trailer, lsdu_size);
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trailer->sequence_nr = htons(frame->sequence_nr);
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trailer->PRP_suffix = htons(ETH_P_PRP);
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skb->protocol = eth_hdr(skb)->h_proto;
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return skb;
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}
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static void hsr_set_path_id(struct hsr_ethhdr *hsr_ethhdr,
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struct hsr_port *port)
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{
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int path_id;
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if (port->type == HSR_PT_SLAVE_A)
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path_id = 0;
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else
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path_id = 1;
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set_hsr_tag_path(&hsr_ethhdr->hsr_tag, path_id);
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}
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static struct sk_buff *hsr_fill_tag(struct sk_buff *skb,
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struct hsr_frame_info *frame,
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struct hsr_port *port, u8 proto_version)
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{
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struct hsr_ethhdr *hsr_ethhdr;
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int lsdu_size;
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/* pad to minimum packet size which is 60 + 6 (HSR tag) */
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if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN))
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return NULL;
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lsdu_size = skb->len - 14;
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if (frame->is_vlan)
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lsdu_size -= 4;
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hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);
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hsr_set_path_id(hsr_ethhdr, port);
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set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size);
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hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);
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hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
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hsr_ethhdr->ethhdr.h_proto = htons(proto_version ?
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ETH_P_HSR : ETH_P_PRP);
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skb->protocol = hsr_ethhdr->ethhdr.h_proto;
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return skb;
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}
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/* If the original frame was an HSR tagged frame, just clone it to be sent
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* unchanged. Otherwise, create a private frame especially tagged for 'port'.
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*/
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struct sk_buff *hsr_create_tagged_frame(struct hsr_frame_info *frame,
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struct hsr_port *port)
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{
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unsigned char *dst, *src;
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struct sk_buff *skb;
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int movelen;
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if (frame->skb_hsr) {
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struct hsr_ethhdr *hsr_ethhdr =
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(struct hsr_ethhdr *)skb_mac_header(frame->skb_hsr);
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/* set the lane id properly */
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hsr_set_path_id(hsr_ethhdr, port);
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return skb_clone(frame->skb_hsr, GFP_ATOMIC);
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}
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/* Create the new skb with enough headroom to fit the HSR tag */
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skb = __pskb_copy(frame->skb_std,
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skb_headroom(frame->skb_std) + HSR_HLEN, GFP_ATOMIC);
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if (!skb)
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return NULL;
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skb_reset_mac_header(skb);
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if (skb->ip_summed == CHECKSUM_PARTIAL)
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skb->csum_start += HSR_HLEN;
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movelen = ETH_HLEN;
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if (frame->is_vlan)
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movelen += VLAN_HLEN;
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src = skb_mac_header(skb);
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dst = skb_push(skb, HSR_HLEN);
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memmove(dst, src, movelen);
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skb_reset_mac_header(skb);
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/* skb_put_padto free skb on error and hsr_fill_tag returns NULL in
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* that case
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*/
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return hsr_fill_tag(skb, frame, port, port->hsr->prot_version);
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}
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struct sk_buff *prp_create_tagged_frame(struct hsr_frame_info *frame,
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struct hsr_port *port)
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{
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struct sk_buff *skb;
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if (frame->skb_prp) {
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struct prp_rct *trailer = skb_get_PRP_rct(frame->skb_prp);
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if (trailer) {
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prp_set_lan_id(trailer, port);
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} else {
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WARN_ONCE(!trailer, "errored PRP skb");
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return NULL;
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}
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return skb_clone(frame->skb_prp, GFP_ATOMIC);
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}
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skb = skb_copy_expand(frame->skb_std, 0,
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skb_tailroom(frame->skb_std) + HSR_HLEN,
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GFP_ATOMIC);
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prp_fill_rct(skb, frame, port);
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return skb;
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}
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static void hsr_deliver_master(struct sk_buff *skb, struct net_device *dev,
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struct hsr_node *node_src)
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{
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bool was_multicast_frame;
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int res;
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was_multicast_frame = (skb->pkt_type == PACKET_MULTICAST);
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hsr_addr_subst_source(node_src, skb);
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skb_pull(skb, ETH_HLEN);
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res = netif_rx(skb);
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if (res == NET_RX_DROP) {
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dev->stats.rx_dropped++;
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} else {
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dev->stats.rx_packets++;
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dev->stats.rx_bytes += skb->len;
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if (was_multicast_frame)
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dev->stats.multicast++;
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}
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}
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static int hsr_xmit(struct sk_buff *skb, struct hsr_port *port,
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struct hsr_frame_info *frame)
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{
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if (frame->port_rcv->type == HSR_PT_MASTER) {
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hsr_addr_subst_dest(frame->node_src, skb, port);
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/* Address substitution (IEC62439-3 pp 26, 50): replace mac
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* address of outgoing frame with that of the outgoing slave's.
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*/
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ether_addr_copy(eth_hdr(skb)->h_source, port->dev->dev_addr);
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}
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return dev_queue_xmit(skb);
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}
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bool prp_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)
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{
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return ((frame->port_rcv->type == HSR_PT_SLAVE_A &&
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port->type == HSR_PT_SLAVE_B) ||
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(frame->port_rcv->type == HSR_PT_SLAVE_B &&
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port->type == HSR_PT_SLAVE_A));
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}
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/* Forward the frame through all devices except:
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* - Back through the receiving device
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* - If it's a HSR frame: through a device where it has passed before
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* - if it's a PRP frame: through another PRP slave device (no bridge)
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* - To the local HSR master only if the frame is directly addressed to it, or
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* a non-supervision multicast or broadcast frame.
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*
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* HSR slave devices should insert a HSR tag into the frame, or forward the
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* frame unchanged if it's already tagged. Interlink devices should strip HSR
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* tags if they're of the non-HSR type (but only after duplicate discard). The
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* master device always strips HSR tags.
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*/
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static void hsr_forward_do(struct hsr_frame_info *frame)
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{
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struct hsr_port *port;
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struct sk_buff *skb;
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hsr_for_each_port(frame->port_rcv->hsr, port) {
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struct hsr_priv *hsr = port->hsr;
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/* Don't send frame back the way it came */
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if (port == frame->port_rcv)
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continue;
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/* Don't deliver locally unless we should */
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if (port->type == HSR_PT_MASTER && !frame->is_local_dest)
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continue;
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/* Deliver frames directly addressed to us to master only */
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if (port->type != HSR_PT_MASTER && frame->is_local_exclusive)
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continue;
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/* Don't send frame over port where it has been sent before.
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* Also fro SAN, this shouldn't be done.
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*/
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if (!frame->is_from_san &&
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hsr_register_frame_out(port, frame->node_src,
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frame->sequence_nr))
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continue;
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if (frame->is_supervision && port->type == HSR_PT_MASTER) {
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hsr_handle_sup_frame(frame);
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continue;
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}
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/* Check if frame is to be dropped. Eg. for PRP no forward
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* between ports.
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*/
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if (hsr->proto_ops->drop_frame &&
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hsr->proto_ops->drop_frame(frame, port))
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continue;
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if (port->type != HSR_PT_MASTER)
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skb = hsr->proto_ops->create_tagged_frame(frame, port);
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else
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skb = hsr->proto_ops->get_untagged_frame(frame, port);
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if (!skb) {
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frame->port_rcv->dev->stats.rx_dropped++;
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continue;
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}
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skb->dev = port->dev;
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if (port->type == HSR_PT_MASTER)
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hsr_deliver_master(skb, port->dev, frame->node_src);
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else
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hsr_xmit(skb, port, frame);
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}
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}
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static void check_local_dest(struct hsr_priv *hsr, struct sk_buff *skb,
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struct hsr_frame_info *frame)
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{
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if (hsr_addr_is_self(hsr, eth_hdr(skb)->h_dest)) {
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frame->is_local_exclusive = true;
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skb->pkt_type = PACKET_HOST;
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} else {
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frame->is_local_exclusive = false;
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}
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if (skb->pkt_type == PACKET_HOST ||
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skb->pkt_type == PACKET_MULTICAST ||
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skb->pkt_type == PACKET_BROADCAST) {
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frame->is_local_dest = true;
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} else {
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frame->is_local_dest = false;
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}
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}
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static void handle_std_frame(struct sk_buff *skb,
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struct hsr_frame_info *frame)
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{
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struct hsr_port *port = frame->port_rcv;
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struct hsr_priv *hsr = port->hsr;
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unsigned long irqflags;
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frame->skb_hsr = NULL;
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frame->skb_prp = NULL;
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frame->skb_std = skb;
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if (port->type != HSR_PT_MASTER) {
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frame->is_from_san = true;
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} else {
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/* Sequence nr for the master node */
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spin_lock_irqsave(&hsr->seqnr_lock, irqflags);
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frame->sequence_nr = hsr->sequence_nr;
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hsr->sequence_nr++;
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spin_unlock_irqrestore(&hsr->seqnr_lock, irqflags);
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}
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}
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void hsr_fill_frame_info(__be16 proto, struct sk_buff *skb,
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struct hsr_frame_info *frame)
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{
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struct hsr_port *port = frame->port_rcv;
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struct hsr_priv *hsr = port->hsr;
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/* HSRv0 supervisory frames double as a tag so treat them as tagged. */
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if ((!hsr->prot_version && proto == htons(ETH_P_PRP)) ||
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proto == htons(ETH_P_HSR)) {
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/* HSR tagged frame :- Data or Supervision */
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frame->skb_std = NULL;
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|
frame->skb_prp = NULL;
|
|
frame->skb_hsr = skb;
|
|
frame->sequence_nr = hsr_get_skb_sequence_nr(skb);
|
|
return;
|
|
}
|
|
|
|
/* Standard frame or PRP from master port */
|
|
handle_std_frame(skb, frame);
|
|
}
|
|
|
|
void prp_fill_frame_info(__be16 proto, struct sk_buff *skb,
|
|
struct hsr_frame_info *frame)
|
|
{
|
|
/* Supervision frame */
|
|
struct prp_rct *rct = skb_get_PRP_rct(skb);
|
|
|
|
if (rct &&
|
|
prp_check_lsdu_size(skb, rct, frame->is_supervision)) {
|
|
frame->skb_hsr = NULL;
|
|
frame->skb_std = NULL;
|
|
frame->skb_prp = skb;
|
|
frame->sequence_nr = prp_get_skb_sequence_nr(rct);
|
|
return;
|
|
}
|
|
handle_std_frame(skb, frame);
|
|
}
|
|
|
|
static int fill_frame_info(struct hsr_frame_info *frame,
|
|
struct sk_buff *skb, struct hsr_port *port)
|
|
{
|
|
struct hsr_priv *hsr = port->hsr;
|
|
struct hsr_vlan_ethhdr *vlan_hdr;
|
|
struct ethhdr *ethhdr;
|
|
__be16 proto;
|
|
|
|
memset(frame, 0, sizeof(*frame));
|
|
frame->is_supervision = is_supervision_frame(port->hsr, skb);
|
|
frame->node_src = hsr_get_node(port, &hsr->node_db, skb,
|
|
frame->is_supervision,
|
|
port->type);
|
|
if (!frame->node_src)
|
|
return -1; /* Unknown node and !is_supervision, or no mem */
|
|
|
|
ethhdr = (struct ethhdr *)skb_mac_header(skb);
|
|
frame->is_vlan = false;
|
|
proto = ethhdr->h_proto;
|
|
|
|
if (proto == htons(ETH_P_8021Q))
|
|
frame->is_vlan = true;
|
|
|
|
if (frame->is_vlan) {
|
|
vlan_hdr = (struct hsr_vlan_ethhdr *)ethhdr;
|
|
proto = vlan_hdr->vlanhdr.h_vlan_encapsulated_proto;
|
|
/* FIXME: */
|
|
netdev_warn_once(skb->dev, "VLAN not yet supported");
|
|
}
|
|
|
|
frame->is_from_san = false;
|
|
frame->port_rcv = port;
|
|
hsr->proto_ops->fill_frame_info(proto, skb, frame);
|
|
check_local_dest(port->hsr, skb, frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Must be called holding rcu read lock (because of the port parameter) */
|
|
void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port)
|
|
{
|
|
struct hsr_frame_info frame;
|
|
|
|
if (skb_mac_header(skb) != skb->data) {
|
|
WARN_ONCE(1, "%s:%d: Malformed frame (port_src %s)\n",
|
|
__FILE__, __LINE__, port->dev->name);
|
|
goto out_drop;
|
|
}
|
|
|
|
if (fill_frame_info(&frame, skb, port) < 0)
|
|
goto out_drop;
|
|
|
|
hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);
|
|
hsr_forward_do(&frame);
|
|
/* Gets called for ingress frames as well as egress from master port.
|
|
* So check and increment stats for master port only here.
|
|
*/
|
|
if (port->type == HSR_PT_MASTER) {
|
|
port->dev->stats.tx_packets++;
|
|
port->dev->stats.tx_bytes += skb->len;
|
|
}
|
|
|
|
kfree_skb(frame.skb_hsr);
|
|
kfree_skb(frame.skb_prp);
|
|
kfree_skb(frame.skb_std);
|
|
return;
|
|
|
|
out_drop:
|
|
port->dev->stats.tx_dropped++;
|
|
kfree_skb(skb);
|
|
}
|