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![Horatiu Vultur](/assets/img/avatar_default.png)
Check the return values of the br_mrp_switchdev function. In case of: - BR_MRP_NONE, return the error to userspace, - BR_MRP_SW, continue with SW implementation, - BR_MRP_HW, continue without SW implementation, Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1228 lines
31 KiB
C
1228 lines
31 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/mrp_bridge.h>
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#include "br_private_mrp.h"
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static const u8 mrp_test_dmac[ETH_ALEN] = { 0x1, 0x15, 0x4e, 0x0, 0x0, 0x1 };
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static const u8 mrp_in_test_dmac[ETH_ALEN] = { 0x1, 0x15, 0x4e, 0x0, 0x0, 0x3 };
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static int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb);
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static struct br_frame_type mrp_frame_type __read_mostly = {
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.type = cpu_to_be16(ETH_P_MRP),
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.frame_handler = br_mrp_process,
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};
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static bool br_mrp_is_ring_port(struct net_bridge_port *p_port,
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struct net_bridge_port *s_port,
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struct net_bridge_port *port)
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{
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if (port == p_port ||
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port == s_port)
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return true;
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return false;
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}
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static bool br_mrp_is_in_port(struct net_bridge_port *i_port,
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struct net_bridge_port *port)
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{
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if (port == i_port)
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return true;
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return false;
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}
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static struct net_bridge_port *br_mrp_get_port(struct net_bridge *br,
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u32 ifindex)
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{
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struct net_bridge_port *res = NULL;
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struct net_bridge_port *port;
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list_for_each_entry(port, &br->port_list, list) {
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if (port->dev->ifindex == ifindex) {
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res = port;
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break;
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}
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}
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return res;
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}
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static struct br_mrp *br_mrp_find_id(struct net_bridge *br, u32 ring_id)
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{
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struct br_mrp *res = NULL;
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struct br_mrp *mrp;
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hlist_for_each_entry_rcu(mrp, &br->mrp_list, list,
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lockdep_rtnl_is_held()) {
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if (mrp->ring_id == ring_id) {
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res = mrp;
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break;
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}
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}
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return res;
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}
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static struct br_mrp *br_mrp_find_in_id(struct net_bridge *br, u32 in_id)
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{
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struct br_mrp *res = NULL;
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struct br_mrp *mrp;
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hlist_for_each_entry_rcu(mrp, &br->mrp_list, list,
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lockdep_rtnl_is_held()) {
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if (mrp->in_id == in_id) {
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res = mrp;
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break;
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}
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}
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return res;
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}
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static bool br_mrp_unique_ifindex(struct net_bridge *br, u32 ifindex)
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{
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struct br_mrp *mrp;
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hlist_for_each_entry_rcu(mrp, &br->mrp_list, list,
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lockdep_rtnl_is_held()) {
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struct net_bridge_port *p;
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p = rtnl_dereference(mrp->p_port);
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if (p && p->dev->ifindex == ifindex)
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return false;
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p = rtnl_dereference(mrp->s_port);
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if (p && p->dev->ifindex == ifindex)
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return false;
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p = rtnl_dereference(mrp->i_port);
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if (p && p->dev->ifindex == ifindex)
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return false;
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}
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return true;
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}
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static struct br_mrp *br_mrp_find_port(struct net_bridge *br,
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struct net_bridge_port *p)
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{
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struct br_mrp *res = NULL;
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struct br_mrp *mrp;
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hlist_for_each_entry_rcu(mrp, &br->mrp_list, list,
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lockdep_rtnl_is_held()) {
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if (rcu_access_pointer(mrp->p_port) == p ||
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rcu_access_pointer(mrp->s_port) == p ||
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rcu_access_pointer(mrp->i_port) == p) {
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res = mrp;
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break;
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}
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}
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return res;
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}
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static int br_mrp_next_seq(struct br_mrp *mrp)
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{
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mrp->seq_id++;
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return mrp->seq_id;
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}
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static struct sk_buff *br_mrp_skb_alloc(struct net_bridge_port *p,
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const u8 *src, const u8 *dst)
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{
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struct ethhdr *eth_hdr;
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struct sk_buff *skb;
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__be16 *version;
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skb = dev_alloc_skb(MRP_MAX_FRAME_LENGTH);
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if (!skb)
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return NULL;
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skb->dev = p->dev;
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skb->protocol = htons(ETH_P_MRP);
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skb->priority = MRP_FRAME_PRIO;
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skb_reserve(skb, sizeof(*eth_hdr));
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eth_hdr = skb_push(skb, sizeof(*eth_hdr));
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ether_addr_copy(eth_hdr->h_dest, dst);
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ether_addr_copy(eth_hdr->h_source, src);
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eth_hdr->h_proto = htons(ETH_P_MRP);
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version = skb_put(skb, sizeof(*version));
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*version = cpu_to_be16(MRP_VERSION);
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return skb;
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}
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static void br_mrp_skb_tlv(struct sk_buff *skb,
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enum br_mrp_tlv_header_type type,
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u8 length)
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{
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struct br_mrp_tlv_hdr *hdr;
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hdr = skb_put(skb, sizeof(*hdr));
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hdr->type = type;
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hdr->length = length;
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}
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static void br_mrp_skb_common(struct sk_buff *skb, struct br_mrp *mrp)
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{
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struct br_mrp_common_hdr *hdr;
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br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_COMMON, sizeof(*hdr));
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hdr = skb_put(skb, sizeof(*hdr));
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hdr->seq_id = cpu_to_be16(br_mrp_next_seq(mrp));
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memset(hdr->domain, 0xff, MRP_DOMAIN_UUID_LENGTH);
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}
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static struct sk_buff *br_mrp_alloc_test_skb(struct br_mrp *mrp,
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struct net_bridge_port *p,
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enum br_mrp_port_role_type port_role)
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{
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struct br_mrp_ring_test_hdr *hdr = NULL;
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struct sk_buff *skb = NULL;
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if (!p)
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return NULL;
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skb = br_mrp_skb_alloc(p, p->dev->dev_addr, mrp_test_dmac);
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if (!skb)
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return NULL;
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br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_RING_TEST, sizeof(*hdr));
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hdr = skb_put(skb, sizeof(*hdr));
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hdr->prio = cpu_to_be16(mrp->prio);
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ether_addr_copy(hdr->sa, p->br->dev->dev_addr);
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hdr->port_role = cpu_to_be16(port_role);
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hdr->state = cpu_to_be16(mrp->ring_state);
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hdr->transitions = cpu_to_be16(mrp->ring_transitions);
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hdr->timestamp = cpu_to_be32(jiffies_to_msecs(jiffies));
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br_mrp_skb_common(skb, mrp);
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br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_END, 0x0);
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return skb;
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}
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static struct sk_buff *br_mrp_alloc_in_test_skb(struct br_mrp *mrp,
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struct net_bridge_port *p,
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enum br_mrp_port_role_type port_role)
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{
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struct br_mrp_in_test_hdr *hdr = NULL;
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struct sk_buff *skb = NULL;
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if (!p)
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return NULL;
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skb = br_mrp_skb_alloc(p, p->dev->dev_addr, mrp_in_test_dmac);
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if (!skb)
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return NULL;
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br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_IN_TEST, sizeof(*hdr));
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hdr = skb_put(skb, sizeof(*hdr));
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hdr->id = cpu_to_be16(mrp->in_id);
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ether_addr_copy(hdr->sa, p->br->dev->dev_addr);
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hdr->port_role = cpu_to_be16(port_role);
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hdr->state = cpu_to_be16(mrp->in_state);
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hdr->transitions = cpu_to_be16(mrp->in_transitions);
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hdr->timestamp = cpu_to_be32(jiffies_to_msecs(jiffies));
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br_mrp_skb_common(skb, mrp);
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br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_END, 0x0);
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return skb;
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}
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/* This function is continuously called in the following cases:
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* - when node role is MRM, in this case test_monitor is always set to false
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* because it needs to notify the userspace that the ring is open and needs to
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* send MRP_Test frames
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* - when node role is MRA, there are 2 subcases:
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* - when MRA behaves as MRM, in this case is similar with MRM role
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* - when MRA behaves as MRC, in this case test_monitor is set to true,
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* because it needs to detect when it stops seeing MRP_Test frames
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* from MRM node but it doesn't need to send MRP_Test frames.
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*/
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static void br_mrp_test_work_expired(struct work_struct *work)
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{
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struct delayed_work *del_work = to_delayed_work(work);
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struct br_mrp *mrp = container_of(del_work, struct br_mrp, test_work);
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struct net_bridge_port *p;
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bool notify_open = false;
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struct sk_buff *skb;
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if (time_before_eq(mrp->test_end, jiffies))
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return;
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if (mrp->test_count_miss < mrp->test_max_miss) {
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mrp->test_count_miss++;
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} else {
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/* Notify that the ring is open only if the ring state is
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* closed, otherwise it would continue to notify at every
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* interval.
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* Also notify that the ring is open when the node has the
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* role MRA and behaves as MRC. The reason is that the
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* userspace needs to know when the MRM stopped sending
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* MRP_Test frames so that the current node to try to take
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* the role of a MRM.
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*/
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if (mrp->ring_state == BR_MRP_RING_STATE_CLOSED ||
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mrp->test_monitor)
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notify_open = true;
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}
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rcu_read_lock();
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p = rcu_dereference(mrp->p_port);
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if (p) {
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if (!mrp->test_monitor) {
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skb = br_mrp_alloc_test_skb(mrp, p,
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BR_MRP_PORT_ROLE_PRIMARY);
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if (!skb)
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goto out;
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skb_reset_network_header(skb);
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dev_queue_xmit(skb);
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}
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if (notify_open && !mrp->ring_role_offloaded)
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br_mrp_ring_port_open(p->dev, true);
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}
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p = rcu_dereference(mrp->s_port);
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if (p) {
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if (!mrp->test_monitor) {
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skb = br_mrp_alloc_test_skb(mrp, p,
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BR_MRP_PORT_ROLE_SECONDARY);
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if (!skb)
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goto out;
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skb_reset_network_header(skb);
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dev_queue_xmit(skb);
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}
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if (notify_open && !mrp->ring_role_offloaded)
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br_mrp_ring_port_open(p->dev, true);
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}
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out:
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rcu_read_unlock();
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queue_delayed_work(system_wq, &mrp->test_work,
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usecs_to_jiffies(mrp->test_interval));
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}
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/* This function is continuously called when the node has the interconnect role
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* MIM. It would generate interconnect test frames and will send them on all 3
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* ports. But will also check if it stop receiving interconnect test frames.
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*/
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static void br_mrp_in_test_work_expired(struct work_struct *work)
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{
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struct delayed_work *del_work = to_delayed_work(work);
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struct br_mrp *mrp = container_of(del_work, struct br_mrp, in_test_work);
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struct net_bridge_port *p;
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bool notify_open = false;
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struct sk_buff *skb;
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if (time_before_eq(mrp->in_test_end, jiffies))
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return;
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if (mrp->in_test_count_miss < mrp->in_test_max_miss) {
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mrp->in_test_count_miss++;
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} else {
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/* Notify that the interconnect ring is open only if the
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* interconnect ring state is closed, otherwise it would
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* continue to notify at every interval.
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*/
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if (mrp->in_state == BR_MRP_IN_STATE_CLOSED)
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notify_open = true;
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}
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rcu_read_lock();
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p = rcu_dereference(mrp->p_port);
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if (p) {
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skb = br_mrp_alloc_in_test_skb(mrp, p,
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BR_MRP_PORT_ROLE_PRIMARY);
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if (!skb)
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goto out;
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skb_reset_network_header(skb);
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dev_queue_xmit(skb);
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if (notify_open && !mrp->in_role_offloaded)
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br_mrp_in_port_open(p->dev, true);
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}
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p = rcu_dereference(mrp->s_port);
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if (p) {
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skb = br_mrp_alloc_in_test_skb(mrp, p,
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BR_MRP_PORT_ROLE_SECONDARY);
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if (!skb)
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goto out;
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skb_reset_network_header(skb);
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dev_queue_xmit(skb);
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if (notify_open && !mrp->in_role_offloaded)
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br_mrp_in_port_open(p->dev, true);
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}
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p = rcu_dereference(mrp->i_port);
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if (p) {
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skb = br_mrp_alloc_in_test_skb(mrp, p,
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BR_MRP_PORT_ROLE_INTER);
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if (!skb)
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goto out;
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skb_reset_network_header(skb);
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dev_queue_xmit(skb);
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if (notify_open && !mrp->in_role_offloaded)
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br_mrp_in_port_open(p->dev, true);
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}
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out:
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rcu_read_unlock();
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queue_delayed_work(system_wq, &mrp->in_test_work,
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usecs_to_jiffies(mrp->in_test_interval));
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}
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/* Deletes the MRP instance.
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* note: called under rtnl_lock
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*/
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static void br_mrp_del_impl(struct net_bridge *br, struct br_mrp *mrp)
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{
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struct net_bridge_port *p;
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u8 state;
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/* Stop sending MRP_Test frames */
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cancel_delayed_work_sync(&mrp->test_work);
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br_mrp_switchdev_send_ring_test(br, mrp, 0, 0, 0, 0);
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/* Stop sending MRP_InTest frames if has an interconnect role */
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cancel_delayed_work_sync(&mrp->in_test_work);
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br_mrp_switchdev_send_in_test(br, mrp, 0, 0, 0);
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br_mrp_switchdev_del(br, mrp);
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/* Reset the ports */
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p = rtnl_dereference(mrp->p_port);
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if (p) {
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spin_lock_bh(&br->lock);
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state = netif_running(br->dev) ?
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BR_STATE_FORWARDING : BR_STATE_DISABLED;
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p->state = state;
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p->flags &= ~BR_MRP_AWARE;
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spin_unlock_bh(&br->lock);
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br_mrp_port_switchdev_set_state(p, state);
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rcu_assign_pointer(mrp->p_port, NULL);
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}
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p = rtnl_dereference(mrp->s_port);
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if (p) {
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spin_lock_bh(&br->lock);
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state = netif_running(br->dev) ?
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BR_STATE_FORWARDING : BR_STATE_DISABLED;
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p->state = state;
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p->flags &= ~BR_MRP_AWARE;
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spin_unlock_bh(&br->lock);
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br_mrp_port_switchdev_set_state(p, state);
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rcu_assign_pointer(mrp->s_port, NULL);
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}
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p = rtnl_dereference(mrp->i_port);
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if (p) {
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spin_lock_bh(&br->lock);
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state = netif_running(br->dev) ?
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BR_STATE_FORWARDING : BR_STATE_DISABLED;
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p->state = state;
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p->flags &= ~BR_MRP_AWARE;
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spin_unlock_bh(&br->lock);
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br_mrp_port_switchdev_set_state(p, state);
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rcu_assign_pointer(mrp->i_port, NULL);
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}
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hlist_del_rcu(&mrp->list);
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kfree_rcu(mrp, rcu);
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if (hlist_empty(&br->mrp_list))
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br_del_frame(br, &mrp_frame_type);
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}
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/* Adds a new MRP instance.
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* note: called under rtnl_lock
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*/
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int br_mrp_add(struct net_bridge *br, struct br_mrp_instance *instance)
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{
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struct net_bridge_port *p;
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struct br_mrp *mrp;
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int err;
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/* If the ring exists, it is not possible to create another one with the
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* same ring_id
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*/
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mrp = br_mrp_find_id(br, instance->ring_id);
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if (mrp)
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return -EINVAL;
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if (!br_mrp_get_port(br, instance->p_ifindex) ||
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!br_mrp_get_port(br, instance->s_ifindex))
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return -EINVAL;
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/* It is not possible to have the same port part of multiple rings */
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if (!br_mrp_unique_ifindex(br, instance->p_ifindex) ||
|
|
!br_mrp_unique_ifindex(br, instance->s_ifindex))
|
|
return -EINVAL;
|
|
|
|
mrp = kzalloc(sizeof(*mrp), GFP_KERNEL);
|
|
if (!mrp)
|
|
return -ENOMEM;
|
|
|
|
mrp->ring_id = instance->ring_id;
|
|
mrp->prio = instance->prio;
|
|
|
|
p = br_mrp_get_port(br, instance->p_ifindex);
|
|
spin_lock_bh(&br->lock);
|
|
p->state = BR_STATE_FORWARDING;
|
|
p->flags |= BR_MRP_AWARE;
|
|
spin_unlock_bh(&br->lock);
|
|
rcu_assign_pointer(mrp->p_port, p);
|
|
|
|
p = br_mrp_get_port(br, instance->s_ifindex);
|
|
spin_lock_bh(&br->lock);
|
|
p->state = BR_STATE_FORWARDING;
|
|
p->flags |= BR_MRP_AWARE;
|
|
spin_unlock_bh(&br->lock);
|
|
rcu_assign_pointer(mrp->s_port, p);
|
|
|
|
if (hlist_empty(&br->mrp_list))
|
|
br_add_frame(br, &mrp_frame_type);
|
|
|
|
INIT_DELAYED_WORK(&mrp->test_work, br_mrp_test_work_expired);
|
|
INIT_DELAYED_WORK(&mrp->in_test_work, br_mrp_in_test_work_expired);
|
|
hlist_add_tail_rcu(&mrp->list, &br->mrp_list);
|
|
|
|
err = br_mrp_switchdev_add(br, mrp);
|
|
if (err)
|
|
goto delete_mrp;
|
|
|
|
return 0;
|
|
|
|
delete_mrp:
|
|
br_mrp_del_impl(br, mrp);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Deletes the MRP instance from which the port is part of
|
|
* note: called under rtnl_lock
|
|
*/
|
|
void br_mrp_port_del(struct net_bridge *br, struct net_bridge_port *p)
|
|
{
|
|
struct br_mrp *mrp = br_mrp_find_port(br, p);
|
|
|
|
/* If the port is not part of a MRP instance just bail out */
|
|
if (!mrp)
|
|
return;
|
|
|
|
br_mrp_del_impl(br, mrp);
|
|
}
|
|
|
|
/* Deletes existing MRP instance based on ring_id
|
|
* note: called under rtnl_lock
|
|
*/
|
|
int br_mrp_del(struct net_bridge *br, struct br_mrp_instance *instance)
|
|
{
|
|
struct br_mrp *mrp = br_mrp_find_id(br, instance->ring_id);
|
|
|
|
if (!mrp)
|
|
return -EINVAL;
|
|
|
|
br_mrp_del_impl(br, mrp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Set port state, port state can be forwarding, blocked or disabled
|
|
* note: already called with rtnl_lock
|
|
*/
|
|
int br_mrp_set_port_state(struct net_bridge_port *p,
|
|
enum br_mrp_port_state_type state)
|
|
{
|
|
u32 port_state;
|
|
|
|
if (!p || !(p->flags & BR_MRP_AWARE))
|
|
return -EINVAL;
|
|
|
|
spin_lock_bh(&p->br->lock);
|
|
|
|
if (state == BR_MRP_PORT_STATE_FORWARDING)
|
|
port_state = BR_STATE_FORWARDING;
|
|
else
|
|
port_state = BR_STATE_BLOCKING;
|
|
|
|
p->state = port_state;
|
|
spin_unlock_bh(&p->br->lock);
|
|
|
|
br_mrp_port_switchdev_set_state(p, port_state);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Set port role, port role can be primary or secondary
|
|
* note: already called with rtnl_lock
|
|
*/
|
|
int br_mrp_set_port_role(struct net_bridge_port *p,
|
|
enum br_mrp_port_role_type role)
|
|
{
|
|
struct br_mrp *mrp;
|
|
|
|
if (!p || !(p->flags & BR_MRP_AWARE))
|
|
return -EINVAL;
|
|
|
|
mrp = br_mrp_find_port(p->br, p);
|
|
|
|
if (!mrp)
|
|
return -EINVAL;
|
|
|
|
switch (role) {
|
|
case BR_MRP_PORT_ROLE_PRIMARY:
|
|
rcu_assign_pointer(mrp->p_port, p);
|
|
break;
|
|
case BR_MRP_PORT_ROLE_SECONDARY:
|
|
rcu_assign_pointer(mrp->s_port, p);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
br_mrp_port_switchdev_set_role(p, role);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Set ring state, ring state can be only Open or Closed
|
|
* note: already called with rtnl_lock
|
|
*/
|
|
int br_mrp_set_ring_state(struct net_bridge *br,
|
|
struct br_mrp_ring_state *state)
|
|
{
|
|
struct br_mrp *mrp = br_mrp_find_id(br, state->ring_id);
|
|
|
|
if (!mrp)
|
|
return -EINVAL;
|
|
|
|
if (mrp->ring_state == BR_MRP_RING_STATE_CLOSED &&
|
|
state->ring_state != BR_MRP_RING_STATE_CLOSED)
|
|
mrp->ring_transitions++;
|
|
|
|
mrp->ring_state = state->ring_state;
|
|
|
|
br_mrp_switchdev_set_ring_state(br, mrp, state->ring_state);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Set ring role, ring role can be only MRM(Media Redundancy Manager) or
|
|
* MRC(Media Redundancy Client).
|
|
* note: already called with rtnl_lock
|
|
*/
|
|
int br_mrp_set_ring_role(struct net_bridge *br,
|
|
struct br_mrp_ring_role *role)
|
|
{
|
|
struct br_mrp *mrp = br_mrp_find_id(br, role->ring_id);
|
|
enum br_mrp_hw_support support;
|
|
|
|
if (!mrp)
|
|
return -EINVAL;
|
|
|
|
mrp->ring_role = role->ring_role;
|
|
|
|
/* If there is an error just bailed out */
|
|
support = br_mrp_switchdev_set_ring_role(br, mrp, role->ring_role);
|
|
if (support == BR_MRP_NONE)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* Now detect if the HW actually applied the role or not. If the HW
|
|
* applied the role it means that the SW will not to do those operations
|
|
* anymore. For example if the role ir MRM then the HW will notify the
|
|
* SW when ring is open, but if the is not pushed to the HW the SW will
|
|
* need to detect when the ring is open
|
|
*/
|
|
mrp->ring_role_offloaded = support == BR_MRP_SW ? 0 : 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Start to generate or monitor MRP test frames, the frames are generated by
|
|
* HW and if it fails, they are generated by the SW.
|
|
* note: already called with rtnl_lock
|
|
*/
|
|
int br_mrp_start_test(struct net_bridge *br,
|
|
struct br_mrp_start_test *test)
|
|
{
|
|
struct br_mrp *mrp = br_mrp_find_id(br, test->ring_id);
|
|
enum br_mrp_hw_support support;
|
|
|
|
if (!mrp)
|
|
return -EINVAL;
|
|
|
|
/* Try to push it to the HW and if it fails then continue with SW
|
|
* implementation and if that also fails then return error.
|
|
*/
|
|
support = br_mrp_switchdev_send_ring_test(br, mrp, test->interval,
|
|
test->max_miss, test->period,
|
|
test->monitor);
|
|
if (support == BR_MRP_NONE)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (support == BR_MRP_HW)
|
|
return 0;
|
|
|
|
mrp->test_interval = test->interval;
|
|
mrp->test_end = jiffies + usecs_to_jiffies(test->period);
|
|
mrp->test_max_miss = test->max_miss;
|
|
mrp->test_monitor = test->monitor;
|
|
mrp->test_count_miss = 0;
|
|
queue_delayed_work(system_wq, &mrp->test_work,
|
|
usecs_to_jiffies(test->interval));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Set in state, int state can be only Open or Closed
|
|
* note: already called with rtnl_lock
|
|
*/
|
|
int br_mrp_set_in_state(struct net_bridge *br, struct br_mrp_in_state *state)
|
|
{
|
|
struct br_mrp *mrp = br_mrp_find_in_id(br, state->in_id);
|
|
|
|
if (!mrp)
|
|
return -EINVAL;
|
|
|
|
if (mrp->in_state == BR_MRP_IN_STATE_CLOSED &&
|
|
state->in_state != BR_MRP_IN_STATE_CLOSED)
|
|
mrp->in_transitions++;
|
|
|
|
mrp->in_state = state->in_state;
|
|
|
|
br_mrp_switchdev_set_in_state(br, mrp, state->in_state);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Set in role, in role can be only MIM(Media Interconnection Manager) or
|
|
* MIC(Media Interconnection Client).
|
|
* note: already called with rtnl_lock
|
|
*/
|
|
int br_mrp_set_in_role(struct net_bridge *br, struct br_mrp_in_role *role)
|
|
{
|
|
struct br_mrp *mrp = br_mrp_find_id(br, role->ring_id);
|
|
enum br_mrp_hw_support support;
|
|
struct net_bridge_port *p;
|
|
|
|
if (!mrp)
|
|
return -EINVAL;
|
|
|
|
if (!br_mrp_get_port(br, role->i_ifindex))
|
|
return -EINVAL;
|
|
|
|
if (role->in_role == BR_MRP_IN_ROLE_DISABLED) {
|
|
u8 state;
|
|
|
|
/* It is not allowed to disable a port that doesn't exist */
|
|
p = rtnl_dereference(mrp->i_port);
|
|
if (!p)
|
|
return -EINVAL;
|
|
|
|
/* Stop the generating MRP_InTest frames */
|
|
cancel_delayed_work_sync(&mrp->in_test_work);
|
|
br_mrp_switchdev_send_in_test(br, mrp, 0, 0, 0);
|
|
|
|
/* Remove the port */
|
|
spin_lock_bh(&br->lock);
|
|
state = netif_running(br->dev) ?
|
|
BR_STATE_FORWARDING : BR_STATE_DISABLED;
|
|
p->state = state;
|
|
p->flags &= ~BR_MRP_AWARE;
|
|
spin_unlock_bh(&br->lock);
|
|
br_mrp_port_switchdev_set_state(p, state);
|
|
rcu_assign_pointer(mrp->i_port, NULL);
|
|
|
|
mrp->in_role = role->in_role;
|
|
mrp->in_id = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* It is not possible to have the same port part of multiple rings */
|
|
if (!br_mrp_unique_ifindex(br, role->i_ifindex))
|
|
return -EINVAL;
|
|
|
|
/* It is not allowed to set a different interconnect port if the mrp
|
|
* instance has already one. First it needs to be disabled and after
|
|
* that set the new port
|
|
*/
|
|
if (rcu_access_pointer(mrp->i_port))
|
|
return -EINVAL;
|
|
|
|
p = br_mrp_get_port(br, role->i_ifindex);
|
|
spin_lock_bh(&br->lock);
|
|
p->state = BR_STATE_FORWARDING;
|
|
p->flags |= BR_MRP_AWARE;
|
|
spin_unlock_bh(&br->lock);
|
|
rcu_assign_pointer(mrp->i_port, p);
|
|
|
|
mrp->in_role = role->in_role;
|
|
mrp->in_id = role->in_id;
|
|
|
|
/* If there is an error just bailed out */
|
|
support = br_mrp_switchdev_set_in_role(br, mrp, role->in_id,
|
|
role->ring_id, role->in_role);
|
|
if (support == BR_MRP_NONE)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* Now detect if the HW actually applied the role or not. If the HW
|
|
* applied the role it means that the SW will not to do those operations
|
|
* anymore. For example if the role is MIM then the HW will notify the
|
|
* SW when interconnect ring is open, but if the is not pushed to the HW
|
|
* the SW will need to detect when the interconnect ring is open.
|
|
*/
|
|
mrp->in_role_offloaded = support == BR_MRP_SW ? 0 : 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Start to generate MRP_InTest frames, the frames are generated by
|
|
* HW and if it fails, they are generated by the SW.
|
|
* note: already called with rtnl_lock
|
|
*/
|
|
int br_mrp_start_in_test(struct net_bridge *br,
|
|
struct br_mrp_start_in_test *in_test)
|
|
{
|
|
struct br_mrp *mrp = br_mrp_find_in_id(br, in_test->in_id);
|
|
enum br_mrp_hw_support support;
|
|
|
|
if (!mrp)
|
|
return -EINVAL;
|
|
|
|
if (mrp->in_role != BR_MRP_IN_ROLE_MIM)
|
|
return -EINVAL;
|
|
|
|
/* Try to push it to the HW and if it fails then continue with SW
|
|
* implementation and if that also fails then return error.
|
|
*/
|
|
support = br_mrp_switchdev_send_in_test(br, mrp, in_test->interval,
|
|
in_test->max_miss,
|
|
in_test->period);
|
|
if (support == BR_MRP_NONE)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (support == BR_MRP_HW)
|
|
return 0;
|
|
|
|
mrp->in_test_interval = in_test->interval;
|
|
mrp->in_test_end = jiffies + usecs_to_jiffies(in_test->period);
|
|
mrp->in_test_max_miss = in_test->max_miss;
|
|
mrp->in_test_count_miss = 0;
|
|
queue_delayed_work(system_wq, &mrp->in_test_work,
|
|
usecs_to_jiffies(in_test->interval));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Determine if the frame type is a ring frame */
|
|
static bool br_mrp_ring_frame(struct sk_buff *skb)
|
|
{
|
|
const struct br_mrp_tlv_hdr *hdr;
|
|
struct br_mrp_tlv_hdr _hdr;
|
|
|
|
hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
|
|
if (!hdr)
|
|
return false;
|
|
|
|
if (hdr->type == BR_MRP_TLV_HEADER_RING_TEST ||
|
|
hdr->type == BR_MRP_TLV_HEADER_RING_TOPO ||
|
|
hdr->type == BR_MRP_TLV_HEADER_RING_LINK_DOWN ||
|
|
hdr->type == BR_MRP_TLV_HEADER_RING_LINK_UP ||
|
|
hdr->type == BR_MRP_TLV_HEADER_OPTION)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Determine if the frame type is an interconnect frame */
|
|
static bool br_mrp_in_frame(struct sk_buff *skb)
|
|
{
|
|
const struct br_mrp_tlv_hdr *hdr;
|
|
struct br_mrp_tlv_hdr _hdr;
|
|
|
|
hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
|
|
if (!hdr)
|
|
return false;
|
|
|
|
if (hdr->type == BR_MRP_TLV_HEADER_IN_TEST ||
|
|
hdr->type == BR_MRP_TLV_HEADER_IN_TOPO ||
|
|
hdr->type == BR_MRP_TLV_HEADER_IN_LINK_DOWN ||
|
|
hdr->type == BR_MRP_TLV_HEADER_IN_LINK_UP ||
|
|
hdr->type == BR_MRP_TLV_HEADER_IN_LINK_STATUS)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Process only MRP Test frame. All the other MRP frames are processed by
|
|
* userspace application
|
|
* note: already called with rcu_read_lock
|
|
*/
|
|
static void br_mrp_mrm_process(struct br_mrp *mrp, struct net_bridge_port *port,
|
|
struct sk_buff *skb)
|
|
{
|
|
const struct br_mrp_tlv_hdr *hdr;
|
|
struct br_mrp_tlv_hdr _hdr;
|
|
|
|
/* Each MRP header starts with a version field which is 16 bits.
|
|
* Therefore skip the version and get directly the TLV header.
|
|
*/
|
|
hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
|
|
if (!hdr)
|
|
return;
|
|
|
|
if (hdr->type != BR_MRP_TLV_HEADER_RING_TEST)
|
|
return;
|
|
|
|
mrp->test_count_miss = 0;
|
|
|
|
/* Notify the userspace that the ring is closed only when the ring is
|
|
* not closed
|
|
*/
|
|
if (mrp->ring_state != BR_MRP_RING_STATE_CLOSED)
|
|
br_mrp_ring_port_open(port->dev, false);
|
|
}
|
|
|
|
/* Determine if the test hdr has a better priority than the node */
|
|
static bool br_mrp_test_better_than_own(struct br_mrp *mrp,
|
|
struct net_bridge *br,
|
|
const struct br_mrp_ring_test_hdr *hdr)
|
|
{
|
|
u16 prio = be16_to_cpu(hdr->prio);
|
|
|
|
if (prio < mrp->prio ||
|
|
(prio == mrp->prio &&
|
|
ether_addr_to_u64(hdr->sa) < ether_addr_to_u64(br->dev->dev_addr)))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Process only MRP Test frame. All the other MRP frames are processed by
|
|
* userspace application
|
|
* note: already called with rcu_read_lock
|
|
*/
|
|
static void br_mrp_mra_process(struct br_mrp *mrp, struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct sk_buff *skb)
|
|
{
|
|
const struct br_mrp_ring_test_hdr *test_hdr;
|
|
struct br_mrp_ring_test_hdr _test_hdr;
|
|
const struct br_mrp_tlv_hdr *hdr;
|
|
struct br_mrp_tlv_hdr _hdr;
|
|
|
|
/* Each MRP header starts with a version field which is 16 bits.
|
|
* Therefore skip the version and get directly the TLV header.
|
|
*/
|
|
hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
|
|
if (!hdr)
|
|
return;
|
|
|
|
if (hdr->type != BR_MRP_TLV_HEADER_RING_TEST)
|
|
return;
|
|
|
|
test_hdr = skb_header_pointer(skb, sizeof(uint16_t) + sizeof(_hdr),
|
|
sizeof(_test_hdr), &_test_hdr);
|
|
if (!test_hdr)
|
|
return;
|
|
|
|
/* Only frames that have a better priority than the node will
|
|
* clear the miss counter because otherwise the node will need to behave
|
|
* as MRM.
|
|
*/
|
|
if (br_mrp_test_better_than_own(mrp, br, test_hdr))
|
|
mrp->test_count_miss = 0;
|
|
}
|
|
|
|
/* Process only MRP InTest frame. All the other MRP frames are processed by
|
|
* userspace application
|
|
* note: already called with rcu_read_lock
|
|
*/
|
|
static bool br_mrp_mim_process(struct br_mrp *mrp, struct net_bridge_port *port,
|
|
struct sk_buff *skb)
|
|
{
|
|
const struct br_mrp_in_test_hdr *in_hdr;
|
|
struct br_mrp_in_test_hdr _in_hdr;
|
|
const struct br_mrp_tlv_hdr *hdr;
|
|
struct br_mrp_tlv_hdr _hdr;
|
|
|
|
/* Each MRP header starts with a version field which is 16 bits.
|
|
* Therefore skip the version and get directly the TLV header.
|
|
*/
|
|
hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
|
|
if (!hdr)
|
|
return false;
|
|
|
|
/* The check for InTest frame type was already done */
|
|
in_hdr = skb_header_pointer(skb, sizeof(uint16_t) + sizeof(_hdr),
|
|
sizeof(_in_hdr), &_in_hdr);
|
|
if (!in_hdr)
|
|
return false;
|
|
|
|
/* It needs to process only it's own InTest frames. */
|
|
if (mrp->in_id != ntohs(in_hdr->id))
|
|
return false;
|
|
|
|
mrp->in_test_count_miss = 0;
|
|
|
|
/* Notify the userspace that the ring is closed only when the ring is
|
|
* not closed
|
|
*/
|
|
if (mrp->in_state != BR_MRP_IN_STATE_CLOSED)
|
|
br_mrp_in_port_open(port->dev, false);
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Get the MRP frame type
|
|
* note: already called with rcu_read_lock
|
|
*/
|
|
static u8 br_mrp_get_frame_type(struct sk_buff *skb)
|
|
{
|
|
const struct br_mrp_tlv_hdr *hdr;
|
|
struct br_mrp_tlv_hdr _hdr;
|
|
|
|
/* Each MRP header starts with a version field which is 16 bits.
|
|
* Therefore skip the version and get directly the TLV header.
|
|
*/
|
|
hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
|
|
if (!hdr)
|
|
return 0xff;
|
|
|
|
return hdr->type;
|
|
}
|
|
|
|
static bool br_mrp_mrm_behaviour(struct br_mrp *mrp)
|
|
{
|
|
if (mrp->ring_role == BR_MRP_RING_ROLE_MRM ||
|
|
(mrp->ring_role == BR_MRP_RING_ROLE_MRA && !mrp->test_monitor))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool br_mrp_mrc_behaviour(struct br_mrp *mrp)
|
|
{
|
|
if (mrp->ring_role == BR_MRP_RING_ROLE_MRC ||
|
|
(mrp->ring_role == BR_MRP_RING_ROLE_MRA && mrp->test_monitor))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/* This will just forward the frame to the other mrp ring ports, depending on
|
|
* the frame type, ring role and interconnect role
|
|
* note: already called with rcu_read_lock
|
|
*/
|
|
static int br_mrp_rcv(struct net_bridge_port *p,
|
|
struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct net_bridge_port *p_port, *s_port, *i_port = NULL;
|
|
struct net_bridge_port *p_dst, *s_dst, *i_dst = NULL;
|
|
struct net_bridge *br;
|
|
struct br_mrp *mrp;
|
|
|
|
/* If port is disabled don't accept any frames */
|
|
if (p->state == BR_STATE_DISABLED)
|
|
return 0;
|
|
|
|
br = p->br;
|
|
mrp = br_mrp_find_port(br, p);
|
|
if (unlikely(!mrp))
|
|
return 0;
|
|
|
|
p_port = rcu_dereference(mrp->p_port);
|
|
if (!p_port)
|
|
return 0;
|
|
p_dst = p_port;
|
|
|
|
s_port = rcu_dereference(mrp->s_port);
|
|
if (!s_port)
|
|
return 0;
|
|
s_dst = s_port;
|
|
|
|
/* If the frame is a ring frame then it is not required to check the
|
|
* interconnect role and ports to process or forward the frame
|
|
*/
|
|
if (br_mrp_ring_frame(skb)) {
|
|
/* If the role is MRM then don't forward the frames */
|
|
if (mrp->ring_role == BR_MRP_RING_ROLE_MRM) {
|
|
br_mrp_mrm_process(mrp, p, skb);
|
|
goto no_forward;
|
|
}
|
|
|
|
/* If the role is MRA then don't forward the frames if it
|
|
* behaves as MRM node
|
|
*/
|
|
if (mrp->ring_role == BR_MRP_RING_ROLE_MRA) {
|
|
if (!mrp->test_monitor) {
|
|
br_mrp_mrm_process(mrp, p, skb);
|
|
goto no_forward;
|
|
}
|
|
|
|
br_mrp_mra_process(mrp, br, p, skb);
|
|
}
|
|
|
|
goto forward;
|
|
}
|
|
|
|
if (br_mrp_in_frame(skb)) {
|
|
u8 in_type = br_mrp_get_frame_type(skb);
|
|
|
|
i_port = rcu_dereference(mrp->i_port);
|
|
i_dst = i_port;
|
|
|
|
/* If the ring port is in block state it should not forward
|
|
* In_Test frames
|
|
*/
|
|
if (br_mrp_is_ring_port(p_port, s_port, p) &&
|
|
p->state == BR_STATE_BLOCKING &&
|
|
in_type == BR_MRP_TLV_HEADER_IN_TEST)
|
|
goto no_forward;
|
|
|
|
/* Nodes that behaves as MRM needs to stop forwarding the
|
|
* frames in case the ring is closed, otherwise will be a loop.
|
|
* In this case the frame is no forward between the ring ports.
|
|
*/
|
|
if (br_mrp_mrm_behaviour(mrp) &&
|
|
br_mrp_is_ring_port(p_port, s_port, p) &&
|
|
(s_port->state != BR_STATE_FORWARDING ||
|
|
p_port->state != BR_STATE_FORWARDING)) {
|
|
p_dst = NULL;
|
|
s_dst = NULL;
|
|
}
|
|
|
|
/* A node that behaves as MRC and doesn't have a interconnect
|
|
* role then it should forward all frames between the ring ports
|
|
* because it doesn't have an interconnect port
|
|
*/
|
|
if (br_mrp_mrc_behaviour(mrp) &&
|
|
mrp->in_role == BR_MRP_IN_ROLE_DISABLED)
|
|
goto forward;
|
|
|
|
if (mrp->in_role == BR_MRP_IN_ROLE_MIM) {
|
|
if (in_type == BR_MRP_TLV_HEADER_IN_TEST) {
|
|
/* MIM should not forward it's own InTest
|
|
* frames
|
|
*/
|
|
if (br_mrp_mim_process(mrp, p, skb)) {
|
|
goto no_forward;
|
|
} else {
|
|
if (br_mrp_is_ring_port(p_port, s_port,
|
|
p))
|
|
i_dst = NULL;
|
|
|
|
if (br_mrp_is_in_port(i_port, p))
|
|
goto no_forward;
|
|
}
|
|
} else {
|
|
/* MIM should forward IntLinkChange/Status and
|
|
* IntTopoChange between ring ports but MIM
|
|
* should not forward IntLinkChange/Status and
|
|
* IntTopoChange if the frame was received at
|
|
* the interconnect port
|
|
*/
|
|
if (br_mrp_is_ring_port(p_port, s_port, p))
|
|
i_dst = NULL;
|
|
|
|
if (br_mrp_is_in_port(i_port, p))
|
|
goto no_forward;
|
|
}
|
|
}
|
|
|
|
if (mrp->in_role == BR_MRP_IN_ROLE_MIC) {
|
|
/* MIC should forward InTest frames on all ports
|
|
* regardless of the received port
|
|
*/
|
|
if (in_type == BR_MRP_TLV_HEADER_IN_TEST)
|
|
goto forward;
|
|
|
|
/* MIC should forward IntLinkChange frames only if they
|
|
* are received on ring ports to all the ports
|
|
*/
|
|
if (br_mrp_is_ring_port(p_port, s_port, p) &&
|
|
(in_type == BR_MRP_TLV_HEADER_IN_LINK_UP ||
|
|
in_type == BR_MRP_TLV_HEADER_IN_LINK_DOWN))
|
|
goto forward;
|
|
|
|
/* MIC should forward IntLinkStatus frames only to
|
|
* interconnect port if it was received on a ring port.
|
|
* If it is received on interconnect port then, it
|
|
* should be forward on both ring ports
|
|
*/
|
|
if (br_mrp_is_ring_port(p_port, s_port, p) &&
|
|
in_type == BR_MRP_TLV_HEADER_IN_LINK_STATUS) {
|
|
p_dst = NULL;
|
|
s_dst = NULL;
|
|
}
|
|
|
|
/* Should forward the InTopo frames only between the
|
|
* ring ports
|
|
*/
|
|
if (in_type == BR_MRP_TLV_HEADER_IN_TOPO) {
|
|
i_dst = NULL;
|
|
goto forward;
|
|
}
|
|
|
|
/* In all the other cases don't forward the frames */
|
|
goto no_forward;
|
|
}
|
|
}
|
|
|
|
forward:
|
|
if (p_dst)
|
|
br_forward(p_dst, skb, true, false);
|
|
if (s_dst)
|
|
br_forward(s_dst, skb, true, false);
|
|
if (i_dst)
|
|
br_forward(i_dst, skb, true, false);
|
|
|
|
no_forward:
|
|
return 1;
|
|
}
|
|
|
|
/* Check if the frame was received on a port that is part of MRP ring
|
|
* and if the frame has MRP eth. In that case process the frame otherwise do
|
|
* normal forwarding.
|
|
* note: already called with rcu_read_lock
|
|
*/
|
|
static int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb)
|
|
{
|
|
/* If there is no MRP instance do normal forwarding */
|
|
if (likely(!(p->flags & BR_MRP_AWARE)))
|
|
goto out;
|
|
|
|
return br_mrp_rcv(p, skb, p->dev);
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
bool br_mrp_enabled(struct net_bridge *br)
|
|
{
|
|
return !hlist_empty(&br->mrp_list);
|
|
}
|