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/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/*
* Copyright (c) 2005 Voltaire Inc. All rights reserved.
* Copyright (c) 2005 Intel Corporation. All rights reserved.
*/
#ifndef IB_ADDR_H
#define IB_ADDR_H
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/socket.h>
#include <linux/if_vlan.h>
#include <net/ipv6.h>
#include <net/if_inet6.h>
#include <net/ip.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_pack.h>
#include <net/net_namespace.h>
/**
* struct rdma_dev_addr - Contains resolved RDMA hardware addresses
* @src_dev_addr: Source MAC address.
* @dst_dev_addr: Destination MAC address.
* @broadcast: Broadcast address of the device.
* @dev_type: The interface hardware type of the device.
* @bound_dev_if: An optional device interface index.
* @transport: The transport type used.
* @net: Network namespace containing the bound_dev_if net_dev.
* @sgid_attr: GID attribute to use for identified SGID
*/
struct rdma_dev_addr {
unsigned char src_dev_addr[MAX_ADDR_LEN];
unsigned char dst_dev_addr[MAX_ADDR_LEN];
unsigned char broadcast[MAX_ADDR_LEN];
unsigned short dev_type;
int bound_dev_if;
enum rdma_transport_type transport;
struct net *net;
const struct ib_gid_attr *sgid_attr;
enum rdma_network_type network;
int hoplimit;
};
/**
* rdma_translate_ip - Translate a local IP address to an RDMA hardware
* address.
*
* The dev_addr->net field must be initialized.
*/
int rdma_translate_ip(const struct sockaddr *addr,
struct rdma_dev_addr *dev_addr);
/**
* rdma_resolve_ip - Resolve source and destination IP addresses to
* RDMA hardware addresses.
* @src_addr: An optional source address to use in the resolution. If a
* source address is not provided, a usable address will be returned via
* the callback.
* @dst_addr: The destination address to resolve.
* @addr: A reference to a data location that will receive the resolved
* addresses. The data location must remain valid until the callback has
* been invoked. The net field of the addr struct must be valid.
* @timeout_ms: Amount of time to wait for the address resolution to complete.
* @callback: Call invoked once address resolution has completed, timed out,
* or been canceled. A status of 0 indicates success.
* @resolve_by_gid_attr: Resolve the ip based on the GID attribute from
* rdma_dev_addr.
* @context: User-specified context associated with the call.
*/
int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
struct rdma_dev_addr *addr, unsigned long timeout_ms,
void (*callback)(int status, struct sockaddr *src_addr,
struct rdma_dev_addr *addr, void *context),
bool resolve_by_gid_attr, void *context);
void rdma_addr_cancel(struct rdma_dev_addr *addr);
int rdma_addr_size(const struct sockaddr *addr);
int rdma_addr_size_in6(struct sockaddr_in6 *addr);
int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr);
static inline u16 ib_addr_get_pkey(struct rdma_dev_addr *dev_addr)
{
return ((u16)dev_addr->broadcast[8] << 8) | (u16)dev_addr->broadcast[9];
}
static inline void ib_addr_set_pkey(struct rdma_dev_addr *dev_addr, u16 pkey)
{
dev_addr->broadcast[8] = pkey >> 8;
dev_addr->broadcast[9] = (unsigned char) pkey;
}
static inline void ib_addr_get_mgid(struct rdma_dev_addr *dev_addr,
union ib_gid *gid)
{
memcpy(gid, dev_addr->broadcast + 4, sizeof *gid);
}
static inline int rdma_addr_gid_offset(struct rdma_dev_addr *dev_addr)
{
return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
}
static inline u16 rdma_vlan_dev_vlan_id(const struct net_device *dev)
{
return is_vlan_dev(dev) ? vlan_dev_vlan_id(dev) : 0xffff;
}
static inline int rdma_ip2gid(struct sockaddr *addr, union ib_gid *gid)
{
switch (addr->sa_family) {
case AF_INET:
ipv6_addr_set_v4mapped(((struct sockaddr_in *)
addr)->sin_addr.s_addr,
(struct in6_addr *)gid);
break;
case AF_INET6:
*(struct in6_addr *)&gid->raw =
((struct sockaddr_in6 *)addr)->sin6_addr;
break;
default:
return -EINVAL;
}
return 0;
}
/* Important - sockaddr should be a union of sockaddr_in and sockaddr_in6 */
static inline void rdma_gid2ip(struct sockaddr *out, const union ib_gid *gid)
{
if (ipv6_addr_v4mapped((struct in6_addr *)gid)) {
struct sockaddr_in *out_in = (struct sockaddr_in *)out;
memset(out_in, 0, sizeof(*out_in));
out_in->sin_family = AF_INET;
memcpy(&out_in->sin_addr.s_addr, gid->raw + 12, 4);
} else {
struct sockaddr_in6 *out_in = (struct sockaddr_in6 *)out;
memset(out_in, 0, sizeof(*out_in));
out_in->sin6_family = AF_INET6;
memcpy(&out_in->sin6_addr.s6_addr, gid->raw, 16);
}
}
/*
* rdma_get/set_sgid/dgid() APIs are applicable to IB, and iWarp.
* They are not applicable to RoCE.
* RoCE GIDs are derived from the IP addresses.
*/
static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
{
memcpy(gid, dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr),
sizeof(*gid));
}
static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
{
memcpy(dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
}
static inline void rdma_addr_get_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
{
memcpy(gid, dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
}
static inline void rdma_addr_set_dgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
{
memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
}
static inline enum ib_mtu iboe_get_mtu(int mtu)
{
/*
* Reduce IB headers from effective IBoE MTU.
*/
mtu = mtu - (IB_GRH_BYTES + IB_UDP_BYTES + IB_BTH_BYTES +
IB_EXT_XRC_BYTES + IB_EXT_ATOMICETH_BYTES +
IB_ICRC_BYTES);
if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
return IB_MTU_4096;
else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
return IB_MTU_2048;
else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
return IB_MTU_1024;
else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
return IB_MTU_512;
else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
return IB_MTU_256;
else
return 0;
}
static inline int rdma_link_local_addr(struct in6_addr *addr)
{
if (addr->s6_addr32[0] == htonl(0xfe800000) &&
addr->s6_addr32[1] == 0)
return 1;
return 0;
}
static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
{
memcpy(mac, &addr->s6_addr[8], 3);
memcpy(mac + 3, &addr->s6_addr[13], 3);
mac[0] ^= 2;
}
static inline int rdma_is_multicast_addr(struct in6_addr *addr)
{
__be32 ipv4_addr;
if (addr->s6_addr[0] == 0xff)
return 1;
ipv4_addr = addr->s6_addr32[3];
return (ipv6_addr_v4mapped(addr) && ipv4_is_multicast(ipv4_addr));
}
static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
{
int i;
mac[0] = 0x33;
mac[1] = 0x33;
for (i = 2; i < 6; ++i)
mac[i] = addr->s6_addr[i + 10];
}
static inline u16 rdma_get_vlan_id(union ib_gid *dgid)
{
u16 vid;
vid = dgid->raw[11] << 8 | dgid->raw[12];
return vid < 0x1000 ? vid : 0xffff;
}
static inline struct net_device *rdma_vlan_dev_real_dev(const struct net_device *dev)
{
return is_vlan_dev(dev) ? vlan_dev_real_dev(dev) : NULL;
}
#endif /* IB_ADDR_H */
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