| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Shared Memory Communications over RDMA (SMC-R) and RoCE |
| * |
| * Definitions for SMC Connections, Link Groups and Links |
| * |
| * Copyright IBM Corp. 2016 |
| * |
| * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> |
| */ |
| |
| #ifndef _SMC_CORE_H |
| #define _SMC_CORE_H |
| |
| #include <linux/atomic.h> |
| #include <rdma/ib_verbs.h> |
| |
| #include "smc.h" |
| #include "smc_ib.h" |
| |
| #define SMC_RMBS_PER_LGR_MAX 255 /* max. # of RMBs per link group */ |
| |
| struct smc_lgr_list { /* list of link group definition */ |
| struct list_head list; |
| spinlock_t lock; /* protects list of link groups */ |
| u32 num; /* unique link group number */ |
| }; |
| |
| enum smc_lgr_role { /* possible roles of a link group */ |
| SMC_CLNT, /* client */ |
| SMC_SERV /* server */ |
| }; |
| |
| enum smc_link_state { /* possible states of a link */ |
| SMC_LNK_INACTIVE, /* link is inactive */ |
| SMC_LNK_ACTIVATING, /* link is being activated */ |
| SMC_LNK_ACTIVE, /* link is active */ |
| SMC_LNK_DELETING, /* link is being deleted */ |
| }; |
| |
| #define SMC_WR_BUF_SIZE 48 /* size of work request buffer */ |
| |
| struct smc_wr_buf { |
| u8 raw[SMC_WR_BUF_SIZE]; |
| }; |
| |
| #define SMC_WR_REG_MR_WAIT_TIME (5 * HZ)/* wait time for ib_wr_reg_mr result */ |
| |
| enum smc_wr_reg_state { |
| POSTED, /* ib_wr_reg_mr request posted */ |
| CONFIRMED, /* ib_wr_reg_mr response: successful */ |
| FAILED /* ib_wr_reg_mr response: failure */ |
| }; |
| |
| struct smc_rdma_sge { /* sges for RDMA writes */ |
| struct ib_sge wr_tx_rdma_sge[SMC_IB_MAX_SEND_SGE]; |
| }; |
| |
| #define SMC_MAX_RDMA_WRITES 2 /* max. # of RDMA writes per |
| * message send |
| */ |
| |
| struct smc_rdma_sges { /* sges per message send */ |
| struct smc_rdma_sge tx_rdma_sge[SMC_MAX_RDMA_WRITES]; |
| }; |
| |
| struct smc_rdma_wr { /* work requests per message |
| * send |
| */ |
| struct ib_rdma_wr wr_tx_rdma[SMC_MAX_RDMA_WRITES]; |
| }; |
| |
| struct smc_link { |
| struct smc_ib_device *smcibdev; /* ib-device */ |
| u8 ibport; /* port - values 1 | 2 */ |
| struct ib_pd *roce_pd; /* IB protection domain, |
| * unique for every RoCE QP |
| */ |
| struct ib_qp *roce_qp; /* IB queue pair */ |
| struct ib_qp_attr qp_attr; /* IB queue pair attributes */ |
| |
| struct smc_wr_buf *wr_tx_bufs; /* WR send payload buffers */ |
| struct ib_send_wr *wr_tx_ibs; /* WR send meta data */ |
| struct ib_sge *wr_tx_sges; /* WR send gather meta data */ |
| struct smc_rdma_sges *wr_tx_rdma_sges;/*RDMA WRITE gather meta data*/ |
| struct smc_rdma_wr *wr_tx_rdmas; /* WR RDMA WRITE */ |
| struct smc_wr_tx_pend *wr_tx_pends; /* WR send waiting for CQE */ |
| /* above four vectors have wr_tx_cnt elements and use the same index */ |
| dma_addr_t wr_tx_dma_addr; /* DMA address of wr_tx_bufs */ |
| atomic_long_t wr_tx_id; /* seq # of last sent WR */ |
| unsigned long *wr_tx_mask; /* bit mask of used indexes */ |
| u32 wr_tx_cnt; /* number of WR send buffers */ |
| wait_queue_head_t wr_tx_wait; /* wait for free WR send buf */ |
| |
| struct smc_wr_buf *wr_rx_bufs; /* WR recv payload buffers */ |
| struct ib_recv_wr *wr_rx_ibs; /* WR recv meta data */ |
| struct ib_sge *wr_rx_sges; /* WR recv scatter meta data */ |
| /* above three vectors have wr_rx_cnt elements and use the same index */ |
| dma_addr_t wr_rx_dma_addr; /* DMA address of wr_rx_bufs */ |
| u64 wr_rx_id; /* seq # of last recv WR */ |
| u32 wr_rx_cnt; /* number of WR recv buffers */ |
| unsigned long wr_rx_tstamp; /* jiffies when last buf rx */ |
| |
| struct ib_reg_wr wr_reg; /* WR register memory region */ |
| wait_queue_head_t wr_reg_wait; /* wait for wr_reg result */ |
| enum smc_wr_reg_state wr_reg_state; /* state of wr_reg request */ |
| |
| u8 gid[SMC_GID_SIZE];/* gid matching used vlan id*/ |
| u8 sgid_index; /* gid index for vlan id */ |
| u32 peer_qpn; /* QP number of peer */ |
| enum ib_mtu path_mtu; /* used mtu */ |
| enum ib_mtu peer_mtu; /* mtu size of peer */ |
| u32 psn_initial; /* QP tx initial packet seqno */ |
| u32 peer_psn; /* QP rx initial packet seqno */ |
| u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */ |
| u8 peer_gid[SMC_GID_SIZE]; /* gid of peer*/ |
| u8 link_id; /* unique # within link group */ |
| |
| enum smc_link_state state; /* state of link */ |
| struct workqueue_struct *llc_wq; /* single thread work queue */ |
| struct completion llc_confirm; /* wait for rx of conf link */ |
| struct completion llc_confirm_resp; /* wait 4 rx of cnf lnk rsp */ |
| int llc_confirm_rc; /* rc from confirm link msg */ |
| int llc_confirm_resp_rc; /* rc from conf_resp msg */ |
| struct completion llc_add; /* wait for rx of add link */ |
| struct completion llc_add_resp; /* wait for rx of add link rsp*/ |
| struct delayed_work llc_testlink_wrk; /* testlink worker */ |
| struct completion llc_testlink_resp; /* wait for rx of testlink */ |
| int llc_testlink_time; /* testlink interval */ |
| struct completion llc_confirm_rkey; /* wait 4 rx of cnf rkey */ |
| int llc_confirm_rkey_rc; /* rc from cnf rkey msg */ |
| struct completion llc_delete_rkey; /* wait 4 rx of del rkey */ |
| int llc_delete_rkey_rc; /* rc from del rkey msg */ |
| struct mutex llc_delete_rkey_mutex; /* serialize usage */ |
| }; |
| |
| /* For now we just allow one parallel link per link group. The SMC protocol |
| * allows more (up to 8). |
| */ |
| #define SMC_LINKS_PER_LGR_MAX 1 |
| #define SMC_SINGLE_LINK 0 |
| |
| #define SMC_FIRST_CONTACT 1 /* first contact to a peer */ |
| #define SMC_REUSE_CONTACT 0 /* follow-on contact to a peer*/ |
| |
| /* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */ |
| struct smc_buf_desc { |
| struct list_head list; |
| void *cpu_addr; /* virtual address of buffer */ |
| struct page *pages; |
| int len; /* length of buffer */ |
| u32 used; /* currently used / unused */ |
| u8 wr_reg : 1; /* mem region registered */ |
| u8 regerr : 1; /* err during registration */ |
| union { |
| struct { /* SMC-R */ |
| struct sg_table sgt[SMC_LINKS_PER_LGR_MAX]; |
| /* virtual buffer */ |
| struct ib_mr *mr_rx[SMC_LINKS_PER_LGR_MAX]; |
| /* for rmb only: memory region |
| * incl. rkey provided to peer |
| */ |
| u32 order; /* allocation order */ |
| }; |
| struct { /* SMC-D */ |
| unsigned short sba_idx; |
| /* SBA index number */ |
| u64 token; |
| /* DMB token number */ |
| dma_addr_t dma_addr; |
| /* DMA address */ |
| }; |
| }; |
| }; |
| |
| struct smc_rtoken { /* address/key of remote RMB */ |
| u64 dma_addr; |
| u32 rkey; |
| }; |
| |
| #define SMC_LGR_ID_SIZE 4 |
| #define SMC_BUF_MIN_SIZE 16384 /* minimum size of an RMB */ |
| #define SMC_RMBE_SIZES 16 /* number of distinct RMBE sizes */ |
| /* theoretically, the RFC states that largest size would be 512K, |
| * i.e. compressed 5 and thus 6 sizes (0..5), despite |
| * struct smc_clc_msg_accept_confirm.rmbe_size being a 4 bit value (0..15) |
| */ |
| |
| struct smcd_dev; |
| |
| struct smc_link_group { |
| struct list_head list; |
| struct rb_root conns_all; /* connection tree */ |
| rwlock_t conns_lock; /* protects conns_all */ |
| unsigned int conns_num; /* current # of connections */ |
| unsigned short vlan_id; /* vlan id of link group */ |
| |
| struct list_head sndbufs[SMC_RMBE_SIZES];/* tx buffers */ |
| rwlock_t sndbufs_lock; /* protects tx buffers */ |
| struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */ |
| rwlock_t rmbs_lock; /* protects rx buffers */ |
| |
| u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */ |
| struct delayed_work free_work; /* delayed freeing of an lgr */ |
| u8 sync_err : 1; /* lgr no longer fits to peer */ |
| u8 terminating : 1;/* lgr is terminating */ |
| |
| bool is_smcd; /* SMC-R or SMC-D */ |
| union { |
| struct { /* SMC-R */ |
| enum smc_lgr_role role; |
| /* client or server */ |
| struct smc_link lnk[SMC_LINKS_PER_LGR_MAX]; |
| /* smc link */ |
| char peer_systemid[SMC_SYSTEMID_LEN]; |
| /* unique system_id of peer */ |
| struct smc_rtoken rtokens[SMC_RMBS_PER_LGR_MAX] |
| [SMC_LINKS_PER_LGR_MAX]; |
| /* remote addr/key pairs */ |
| DECLARE_BITMAP(rtokens_used_mask, SMC_RMBS_PER_LGR_MAX); |
| /* used rtoken elements */ |
| }; |
| struct { /* SMC-D */ |
| u64 peer_gid; |
| /* Peer GID (remote) */ |
| struct smcd_dev *smcd; |
| /* ISM device for VLAN reg. */ |
| }; |
| }; |
| }; |
| |
| /* Find the connection associated with the given alert token in the link group. |
| * To use rbtrees we have to implement our own search core. |
| * Requires @conns_lock |
| * @token alert token to search for |
| * @lgr link group to search in |
| * Returns connection associated with token if found, NULL otherwise. |
| */ |
| static inline struct smc_connection *smc_lgr_find_conn( |
| u32 token, struct smc_link_group *lgr) |
| { |
| struct smc_connection *res = NULL; |
| struct rb_node *node; |
| |
| node = lgr->conns_all.rb_node; |
| while (node) { |
| struct smc_connection *cur = rb_entry(node, |
| struct smc_connection, alert_node); |
| |
| if (cur->alert_token_local > token) { |
| node = node->rb_left; |
| } else { |
| if (cur->alert_token_local < token) { |
| node = node->rb_right; |
| } else { |
| res = cur; |
| break; |
| } |
| } |
| } |
| |
| return res; |
| } |
| |
| struct smc_sock; |
| struct smc_clc_msg_accept_confirm; |
| struct smc_clc_msg_local; |
| |
| void smc_lgr_forget(struct smc_link_group *lgr); |
| void smc_lgr_terminate(struct smc_link_group *lgr); |
| void smc_port_terminate(struct smc_ib_device *smcibdev, u8 ibport); |
| void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, |
| unsigned short vlan); |
| int smc_buf_create(struct smc_sock *smc, bool is_smcd); |
| int smc_uncompress_bufsize(u8 compressed); |
| int smc_rmb_rtoken_handling(struct smc_connection *conn, |
| struct smc_clc_msg_accept_confirm *clc); |
| int smc_rtoken_add(struct smc_link_group *lgr, __be64 nw_vaddr, __be32 nw_rkey); |
| int smc_rtoken_delete(struct smc_link_group *lgr, __be32 nw_rkey); |
| void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn); |
| void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn); |
| void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn); |
| void smc_rmb_sync_sg_for_device(struct smc_connection *conn); |
| int smc_vlan_by_tcpsk(struct socket *clcsock, unsigned short *vlan_id); |
| |
| void smc_conn_free(struct smc_connection *conn); |
| int smc_conn_create(struct smc_sock *smc, bool is_smcd, int srv_first_contact, |
| struct smc_ib_device *smcibdev, u8 ibport, u32 clcqpn, |
| struct smc_clc_msg_local *lcl, struct smcd_dev *smcd, |
| u64 peer_gid); |
| void smcd_conn_free(struct smc_connection *conn); |
| void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr); |
| void smc_core_exit(void); |
| |
| static inline struct smc_link_group *smc_get_lgr(struct smc_link *link) |
| { |
| return container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]); |
| } |
| #endif |