static void hsr_fill_tag(struct hsr_ethhdr *hsr_ethhdr, struct hsr_priv *hsr_priv)
{
unsigned long irqflags;
/* IEC 62439-1:2010, p 48, says the 4-bit "path" field can take values
* between 0001-1001 ("ring identifier", for regular HSR frames),
* or 1111 ("HSR management", supervision frames). Unfortunately, the
* spec writers forgot to explain what a "ring identifier" is, or
* how it is used. So we just set this to 0001 for regular frames,
* and 1111 for supervision frames.
*/
set_hsr_tag_path(&hsr_ethhdr->hsr_tag, 0x1);
/* IEC 62439-1:2010, p 12: "The link service data unit in an Ethernet
* frame is the content of the frame located between the Length/Type
* field and the Frame Check Sequence."
*
* IEC 62439-3, p 48, specifies the "original LPDU" to include the
* original "LT" field (what "LT" means is not explained anywhere as
* far as I can see - perhaps "Length/Type"?). So LSDU_size might
* equal original length + 2.
* Also, the fact that this field is not used anywhere (might be used
* by a RedBox connecting HSR and PRP nets?) means I cannot test its
* correctness. Instead of guessing, I set this to 0 here, to make any
* problems immediately apparent. Anyone using this driver with PRP/HSR
* RedBoxes might need to fix this...
*/
set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, 0);
spin_lock_irqsave(&hsr_priv->seqnr_lock, irqflags);
hsr_ethhdr->hsr_tag.sequence_nr = htons(hsr_priv->sequence_nr);
hsr_priv->sequence_nr++;
spin_unlock_irqrestore(&hsr_priv->seqnr_lock, irqflags);
hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
hsr_ethhdr->ethhdr.h_proto = htons(ETH_P_PRP);
}
static void send_hsr_supervision_frame(struct hsr_port *master,
u8 type, u8 hsrVer)
{
struct sk_buff *skb;
int hlen, tlen;
struct hsr_tag *hsr_tag;
struct hsr_sup_tag *hsr_stag;
struct hsr_sup_payload *hsr_sp;
unsigned long irqflags;
hlen = LL_RESERVED_SPACE(master->dev);
tlen = master->dev->needed_tailroom;
skb = dev_alloc_skb(
sizeof(struct hsr_tag) +
sizeof(struct hsr_sup_tag) +
sizeof(struct hsr_sup_payload) + hlen + tlen);
if (skb == NULL)
return;
skb_reserve(skb, hlen);
skb->dev = master->dev;
skb->protocol = htons(hsrVer ? ETH_P_HSR : ETH_P_PRP);
skb->priority = TC_PRIO_CONTROL;
if (dev_hard_header(skb, skb->dev, (hsrVer ? ETH_P_HSR : ETH_P_PRP),
master->hsr->sup_multicast_addr,
skb->dev->dev_addr, skb->len) <= 0)
goto out;
skb_reset_mac_header(skb);
if (hsrVer > 0) {
hsr_tag = (typeof(hsr_tag)) skb_put(skb, sizeof(struct hsr_tag));
hsr_tag->encap_proto = htons(ETH_P_PRP);
set_hsr_tag_LSDU_size(hsr_tag, HSR_V1_SUP_LSDUSIZE);
}
hsr_stag = (typeof(hsr_stag)) skb_put(skb, sizeof(struct hsr_sup_tag));
set_hsr_stag_path(hsr_stag, (hsrVer ? 0x0 : 0xf));
set_hsr_stag_HSR_Ver(hsr_stag, hsrVer);
/* From HSRv1 on we have separate supervision sequence numbers. */
spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags);
if (hsrVer > 0) {
hsr_stag->sequence_nr = htons(master->hsr->sup_sequence_nr);
hsr_tag->sequence_nr = htons(master->hsr->sequence_nr);
master->hsr->sup_sequence_nr++;
master->hsr->sequence_nr++;
} else {
hsr_stag->sequence_nr = htons(master->hsr->sequence_nr);
master->hsr->sequence_nr++;
}
spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags);
hsr_stag->HSR_TLV_Type = type;
/* TODO: Why 12 in HSRv0? */
hsr_stag->HSR_TLV_Length = hsrVer ? sizeof(struct hsr_sup_payload) : 12;
/* Payload: MacAddressA */
hsr_sp = (typeof(hsr_sp)) skb_put(skb, sizeof(struct hsr_sup_payload));
ether_addr_copy(hsr_sp->MacAddressA, master->dev->dev_addr);
skb_put_padto(skb, ETH_ZLEN + HSR_HLEN);
hsr_forward_skb(skb, master);
return;
out:
WARN_ONCE(1, "HSR: Could not send supervision frame\n");
kfree_skb(skb);
}
