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b81a5eb789
SMC Version 2 defines a first contact extension for CLC accept and CLC confirm. This patch covers sending and receiving of the CLC first contact extension. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
296 lines
8.5 KiB
C
296 lines
8.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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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 <linux/compiler.h> /* __aligned */
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#include <net/sock.h>
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#include "smc_ib.h"
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#define SMC_V1 1 /* SMC version V1 */
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#define SMC_V2 2 /* SMC version V2 */
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#define SMC_RELEASE 0
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#define SMCPROTO_SMC 0 /* SMC protocol, IPv4 */
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#define SMCPROTO_SMC6 1 /* SMC protocol, IPv6 */
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#define SMC_MAX_ISM_DEVS 8 /* max # of proposed non-native ISM
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* devices
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*/
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#define SMC_MAX_HOSTNAME_LEN 32
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#define SMC_MAX_EID_LEN 32
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extern struct proto smc_proto;
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extern struct proto smc_proto6;
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#ifdef ATOMIC64_INIT
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#define KERNEL_HAS_ATOMIC64
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#endif
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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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/* normal close */
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SMC_PEERCLOSEWAIT1 = 20,
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SMC_PEERCLOSEWAIT2 = 21,
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SMC_APPFINCLOSEWAIT = 24,
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SMC_APPCLOSEWAIT1 = 22,
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SMC_APPCLOSEWAIT2 = 23,
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SMC_PEERFINCLOSEWAIT = 25,
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/* abnormal close */
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SMC_PEERABORTWAIT = 26,
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SMC_PROCESSABORT = 27,
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};
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struct smc_link_group;
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struct smc_wr_rx_hdr { /* common prefix part of LLC and CDC to demultiplex */
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u8 type;
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} __aligned(1);
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struct smc_cdc_conn_state_flags {
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#if defined(__BIG_ENDIAN_BITFIELD)
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u8 peer_done_writing : 1; /* Sending done indicator */
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u8 peer_conn_closed : 1; /* Peer connection closed indicator */
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u8 peer_conn_abort : 1; /* Abnormal close indicator */
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u8 reserved : 5;
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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u8 reserved : 5;
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u8 peer_conn_abort : 1;
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u8 peer_conn_closed : 1;
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u8 peer_done_writing : 1;
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#endif
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};
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struct smc_cdc_producer_flags {
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#if defined(__BIG_ENDIAN_BITFIELD)
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u8 write_blocked : 1; /* Writing Blocked, no rx buf space */
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u8 urg_data_pending : 1; /* Urgent Data Pending */
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u8 urg_data_present : 1; /* Urgent Data Present */
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u8 cons_curs_upd_req : 1; /* cursor update requested */
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u8 failover_validation : 1;/* message replay due to failover */
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u8 reserved : 3;
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#elif defined(__LITTLE_ENDIAN_BITFIELD)
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u8 reserved : 3;
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u8 failover_validation : 1;
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u8 cons_curs_upd_req : 1;
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u8 urg_data_present : 1;
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u8 urg_data_pending : 1;
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u8 write_blocked : 1;
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#endif
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};
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/* in host byte order */
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union smc_host_cursor { /* SMC cursor - an offset in an RMBE */
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struct {
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u16 reserved;
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u16 wrap; /* window wrap sequence number */
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u32 count; /* cursor (= offset) part */
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};
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#ifdef KERNEL_HAS_ATOMIC64
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atomic64_t acurs; /* for atomic processing */
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#else
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u64 acurs; /* for atomic processing */
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#endif
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} __aligned(8);
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/* in host byte order, except for flag bitfields in network byte order */
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struct smc_host_cdc_msg { /* Connection Data Control message */
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struct smc_wr_rx_hdr common; /* .type = 0xFE */
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u8 len; /* length = 44 */
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u16 seqno; /* connection seq # */
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u32 token; /* alert_token */
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union smc_host_cursor prod; /* producer cursor */
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union smc_host_cursor cons; /* consumer cursor,
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* piggy backed "ack"
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*/
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struct smc_cdc_producer_flags prod_flags; /* conn. tx/rx status */
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struct smc_cdc_conn_state_flags conn_state_flags; /* peer conn. status*/
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u8 reserved[18];
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} __aligned(8);
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enum smc_urg_state {
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SMC_URG_VALID = 1, /* data present */
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SMC_URG_NOTYET = 2, /* data pending */
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SMC_URG_READ = 3, /* data was already read */
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};
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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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struct smc_link *lnk; /* assigned SMC-R link */
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u32 alert_token_local; /* unique conn. id */
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u8 peer_rmbe_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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int rtoken_idx; /* idx to peer RMB rkey/addr */
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struct smc_buf_desc *sndbuf_desc; /* send buffer descriptor */
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struct smc_buf_desc *rmb_desc; /* RMBE descriptor */
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int rmbe_size_short;/* compressed notation */
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int rmbe_update_limit;
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/* lower limit for consumer
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* cursor update
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*/
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struct smc_host_cdc_msg local_tx_ctrl; /* host byte order staging
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* buffer for CDC msg send
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* .prod cf. TCP snd_nxt
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* .cons cf. TCP sends ack
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*/
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union smc_host_cursor local_tx_ctrl_fin;
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/* prod crsr - confirmed by peer
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*/
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union smc_host_cursor tx_curs_prep; /* tx - prepared data
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* snd_max..wmem_alloc
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*/
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union smc_host_cursor tx_curs_sent; /* tx - sent data
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* snd_nxt ?
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*/
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union smc_host_cursor tx_curs_fin; /* tx - confirmed by peer
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* snd-wnd-begin ?
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*/
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atomic_t sndbuf_space; /* remaining space in sndbuf */
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u16 tx_cdc_seq; /* sequence # for CDC send */
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u16 tx_cdc_seq_fin; /* sequence # - tx completed */
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spinlock_t send_lock; /* protect wr_sends */
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struct delayed_work tx_work; /* retry of smc_cdc_msg_send */
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u32 tx_off; /* base offset in peer rmb */
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struct smc_host_cdc_msg local_rx_ctrl; /* filled during event_handl.
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* .prod cf. TCP rcv_nxt
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* .cons cf. TCP snd_una
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*/
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union smc_host_cursor rx_curs_confirmed; /* confirmed to peer
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* source of snd_una ?
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*/
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union smc_host_cursor urg_curs; /* points at urgent byte */
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enum smc_urg_state urg_state;
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bool urg_tx_pend; /* urgent data staged */
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bool urg_rx_skip_pend;
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/* indicate urgent oob data
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* read, but previous regular
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* data still pending
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*/
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char urg_rx_byte; /* urgent byte */
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atomic_t bytes_to_rcv; /* arrived data,
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* not yet received
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*/
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atomic_t splice_pending; /* number of spliced bytes
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* pending processing
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*/
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#ifndef KERNEL_HAS_ATOMIC64
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spinlock_t acurs_lock; /* protect cursors */
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#endif
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struct work_struct close_work; /* peer sent some closing */
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struct work_struct abort_work; /* abort the connection */
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struct tasklet_struct rx_tsklet; /* Receiver tasklet for SMC-D */
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u8 rx_off; /* receive offset:
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* 0 for SMC-R, 32 for SMC-D
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*/
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u64 peer_token; /* SMC-D token of peer */
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u8 killed : 1; /* abnormal termination */
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u8 out_of_sync : 1; /* out of sync with peer */
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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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void (*clcsk_data_ready)(struct sock *sk);
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/* original data_ready fct. **/
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struct smc_connection conn; /* smc connection */
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struct smc_sock *listen_smc; /* listen parent */
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struct work_struct connect_work; /* handle non-blocking connect*/
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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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int fallback_rsn; /* reason for fallback */
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u32 peer_diagnosis; /* decline reason from peer */
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int sockopt_defer_accept;
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/* sockopt TCP_DEFER_ACCEPT
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* value
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*/
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u8 wait_close_tx_prepared : 1;
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/* shutdown wr or close
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* started, waiting for unsent
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* data to be sent
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*/
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u8 connect_nonblock : 1;
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/* non-blocking connect in
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* flight
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*/
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struct mutex clcsock_release_lock;
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/* protects clcsock of a listen
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* socket
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* */
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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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extern struct workqueue_struct *smc_hs_wq; /* wq for handshake work */
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extern struct workqueue_struct *smc_close_wq; /* wq for close work */
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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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#define ntohll(x) be64_to_cpu(x)
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#define htonll(x) cpu_to_be64(x)
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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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#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]) ? true : false;
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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 false;
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}
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#endif
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struct sock *smc_accept_dequeue(struct sock *parent, struct socket *new_sock);
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void smc_close_non_accepted(struct sock *sk);
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#endif /* __SMC_H */
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