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Diffstat (limited to 'include/rdma/ib_addr.h')
| -rw-r--r-- | include/rdma/ib_addr.h | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/include/rdma/ib_addr.h b/include/rdma/ib_addr.h new file mode 100644 index 0000000000..811a0f11d0 --- /dev/null +++ b/include/rdma/ib_addr.h @@ -0,0 +1,247 @@ +/* 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/ethtool.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 */ |