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* allocate data RMB memory for sending and receiving * size depends on the maximum socket send and receive buffers * allocated RMBs are kept during life time of the owning link group * map the allocated RMBs to DMA Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
147 lines
3.9 KiB
C
147 lines
3.9 KiB
C
/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Definitions for the SMC module (socket related)
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#ifndef __SMC_H
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#define __SMC_H
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#include <linux/socket.h>
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#include <linux/types.h>
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#include <net/sock.h>
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#include "smc_ib.h"
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#define SMCPROTO_SMC 0 /* SMC protocol */
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#define SMC_MAX_PORTS 2 /* Max # of ports */
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enum smc_state { /* possible states of an SMC socket */
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SMC_ACTIVE = 1,
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SMC_INIT = 2,
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SMC_CLOSED = 7,
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SMC_LISTEN = 10,
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};
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struct smc_link_group;
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struct smc_connection {
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struct rb_node alert_node;
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struct smc_link_group *lgr; /* link group of connection */
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u32 alert_token_local; /* unique conn. id */
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u8 peer_conn_idx; /* from tcp handshake */
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int peer_rmbe_size; /* size of peer rx buffer */
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atomic_t peer_rmbe_space;/* remaining free bytes in peer
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* rmbe
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*/
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struct smc_buf_desc *sndbuf_desc; /* send buffer descriptor */
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int sndbuf_size; /* sndbuf size <== sock wmem */
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struct smc_buf_desc *rmb_desc; /* RMBE descriptor */
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int rmbe_size; /* RMBE size <== sock rmem */
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int rmbe_size_short;/* compressed notation */
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};
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struct smc_sock { /* smc sock container */
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struct sock sk;
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struct socket *clcsock; /* internal tcp socket */
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struct smc_connection conn; /* smc connection */
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struct sockaddr *addr; /* inet connect address */
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struct smc_sock *listen_smc; /* listen parent */
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struct work_struct tcp_listen_work;/* handle tcp socket accepts */
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struct work_struct smc_listen_work;/* prepare new accept socket */
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struct list_head accept_q; /* sockets to be accepted */
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spinlock_t accept_q_lock; /* protects accept_q */
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bool use_fallback; /* fallback to tcp */
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};
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static inline struct smc_sock *smc_sk(const struct sock *sk)
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{
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return (struct smc_sock *)sk;
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}
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#define SMC_SYSTEMID_LEN 8
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extern u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */
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/* convert an u32 value into network byte order, store it into a 3 byte field */
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static inline void hton24(u8 *net, u32 host)
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{
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__be32 t;
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t = cpu_to_be32(host);
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memcpy(net, ((u8 *)&t) + 1, 3);
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}
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/* convert a received 3 byte field into host byte order*/
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static inline u32 ntoh24(u8 *net)
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{
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__be32 t = 0;
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memcpy(((u8 *)&t) + 1, net, 3);
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return be32_to_cpu(t);
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}
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#define SMC_BUF_MIN_SIZE 16384 /* minimum size of an RMB */
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#define SMC_RMBE_SIZES 16 /* number of distinct sizes for an RMBE */
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/* theoretically, the RFC states that largest size would be 512K,
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* i.e. compressed 5 and thus 6 sizes (0..5), despite
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* struct smc_clc_msg_accept_confirm.rmbe_size being a 4 bit value (0..15)
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*/
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/* convert the RMB size into the compressed notation - minimum 16K.
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* In contrast to plain ilog2, this rounds towards the next power of 2,
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* so the socket application gets at least its desired sndbuf / rcvbuf size.
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*/
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static inline u8 smc_compress_bufsize(int size)
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{
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u8 compressed;
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if (size <= SMC_BUF_MIN_SIZE)
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return 0;
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size = (size - 1) >> 14;
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compressed = ilog2(size) + 1;
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if (compressed >= SMC_RMBE_SIZES)
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compressed = SMC_RMBE_SIZES - 1;
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return compressed;
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}
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/* convert the RMB size from compressed notation into integer */
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static inline int smc_uncompress_bufsize(u8 compressed)
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{
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u32 size;
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size = 0x00000001 << (((int)compressed) + 14);
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return (int)size;
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}
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#ifdef CONFIG_XFRM
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static inline bool using_ipsec(struct smc_sock *smc)
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{
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return (smc->clcsock->sk->sk_policy[0] ||
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smc->clcsock->sk->sk_policy[1]) ? 1 : 0;
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}
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#else
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static inline bool using_ipsec(struct smc_sock *smc)
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{
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return 0;
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}
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#endif
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struct smc_clc_msg_local;
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int smc_netinfo_by_tcpsk(struct socket *clcsock, __be32 *subnet,
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u8 *prefix_len);
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void smc_conn_free(struct smc_connection *conn);
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int smc_conn_create(struct smc_sock *smc, __be32 peer_in_addr,
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struct smc_ib_device *smcibdev, u8 ibport,
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struct smc_clc_msg_local *lcl, int srv_first_contact);
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#endif /* __SMC_H */
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