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linux-sg2042/net/smc/smc_core.h

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/* 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 <linux/smc.h>
#include <linux/pci.h>
#include <rdma/ib_verbs.h>
#include <net/genetlink.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_UNUSED, /* link is unused */
SMC_LNK_INACTIVE, /* link is inactive */
SMC_LNK_ACTIVATING, /* link is being activated */
SMC_LNK_ACTIVE, /* link is active */
};
#define SMC_WR_BUF_SIZE 48 /* size of work request buffer */
#define SMC_WR_BUF_V2_SIZE 8192 /* size of v2 work request buffer */
struct smc_wr_buf {
u8 raw[SMC_WR_BUF_SIZE];
};
struct smc_wr_v2_buf {
u8 raw[SMC_WR_BUF_V2_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];
};
#define SMC_LGR_ID_SIZE 4
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 */
struct completion *wr_tx_compl; /* WR send CQE completion */
/* above four vectors have wr_tx_cnt elements and use the same index */
struct ib_send_wr *wr_tx_v2_ib; /* WR send v2 meta data */
struct ib_sge *wr_tx_v2_sge; /* WR send v2 gather meta data*/
struct smc_wr_tx_pend *wr_tx_v2_pend; /* WR send v2 waiting for CQE */
dma_addr_t wr_tx_dma_addr; /* DMA address of wr_tx_bufs */
dma_addr_t wr_tx_v2_dma_addr; /* DMA address of v2 tx buf*/
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 */
atomic_t wr_tx_refcnt; /* tx refs to link */
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 */
dma_addr_t wr_rx_v2_dma_addr; /* DMA address of v2 rx buf*/
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 */
atomic_t wr_reg_refcnt; /* reg refs to link */
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 */
u8 link_uid[SMC_LGR_ID_SIZE]; /* unique lnk id */
u8 peer_link_uid[SMC_LGR_ID_SIZE]; /* peer uid */
u8 link_idx; /* index in lgr link array */
u8 link_is_asym; /* is link asymmetric? */
u8 clearing : 1; /* link is being cleared */
refcount_t refcnt; /* link reference count */
struct smc_link_group *lgr; /* parent link group */
struct work_struct link_down_wrk; /* wrk to bring link down */
char ibname[IB_DEVICE_NAME_MAX]; /* ib device name */
int ndev_ifidx; /* network device ifindex */
enum smc_link_state state; /* state of link */
struct delayed_work llc_testlink_wrk; /* testlink worker */
struct completion llc_testlink_resp; /* wait for rx of testlink */
int llc_testlink_time; /* testlink interval */
atomic_t conn_cnt; /* connections on this link */
};
/* 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 3
#define SMC_SINGLE_LINK 0
/* 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 */
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 */
u8 is_conf_rkey;
/* confirm_rkey done */
u8 is_reg_mr[SMC_LINKS_PER_LGR_MAX];
/* mem region registered */
u8 is_map_ib[SMC_LINKS_PER_LGR_MAX];
/* mem region mapped to lnk */
u8 is_reg_err;
/* buffer registration err */
};
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_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;
enum smc_lgr_type { /* redundancy state of lgr */
SMC_LGR_NONE, /* no active links, lgr to be deleted */
SMC_LGR_SINGLE, /* 1 active RNIC on each peer */
SMC_LGR_SYMMETRIC, /* 2 active RNICs on each peer */
SMC_LGR_ASYMMETRIC_PEER, /* local has 2, peer 1 active RNICs */
SMC_LGR_ASYMMETRIC_LOCAL, /* local has 1, peer 2 active RNICs */
};
enum smc_llc_flowtype {
SMC_LLC_FLOW_NONE = 0,
SMC_LLC_FLOW_ADD_LINK = 2,
SMC_LLC_FLOW_DEL_LINK = 4,
SMC_LLC_FLOW_REQ_ADD_LINK = 5,
SMC_LLC_FLOW_RKEY = 6,
};
struct smc_llc_qentry;
struct smc_llc_flow {
enum smc_llc_flowtype type;
struct smc_llc_qentry *qentry;
};
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 */
struct mutex sndbufs_lock; /* protects tx buffers */
struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */
struct mutex rmbs_lock; /* protects rx buffers */
u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */
struct delayed_work free_work; /* delayed freeing of an lgr */
struct work_struct terminate_work; /* abnormal lgr termination */
struct workqueue_struct *tx_wq; /* wq for conn. tx workers */
u8 sync_err : 1; /* lgr no longer fits to peer */
u8 terminating : 1;/* lgr is terminating */
u8 freeing : 1; /* lgr is being freed */
refcount_t refcnt; /* lgr reference count */
bool is_smcd; /* SMC-R or SMC-D */
u8 smc_version;
u8 negotiated_eid[SMC_MAX_EID_LEN];
u8 peer_os; /* peer operating system */
u8 peer_smc_release;
u8 peer_hostname[SMC_MAX_HOSTNAME_LEN];
union {
struct { /* SMC-R */
enum smc_lgr_role role;
/* client or server */
struct smc_link lnk[SMC_LINKS_PER_LGR_MAX];
/* smc link */
struct smc_wr_v2_buf *wr_rx_buf_v2;
/* WR v2 recv payload buffer */
struct smc_wr_v2_buf *wr_tx_buf_v2;
/* WR v2 send payload buffer */
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 */
u8 next_link_id;
enum smc_lgr_type type;
/* redundancy state */
u8 pnet_id[SMC_MAX_PNETID_LEN + 1];
/* pnet id of this lgr */
struct list_head llc_event_q;
/* queue for llc events */
spinlock_t llc_event_q_lock;
/* protects llc_event_q */
struct mutex llc_conf_mutex;
/* protects lgr reconfig. */
struct work_struct llc_add_link_work;
struct work_struct llc_del_link_work;
struct work_struct llc_event_work;
/* llc event worker */
wait_queue_head_t llc_flow_waiter;
/* w4 next llc event */
wait_queue_head_t llc_msg_waiter;
/* w4 next llc msg */
struct smc_llc_flow llc_flow_lcl;
/* llc local control field */
struct smc_llc_flow llc_flow_rmt;
/* llc remote control field */
struct smc_llc_qentry *delayed_event;
/* arrived when flow active */
spinlock_t llc_flow_lock;
/* protects llc flow */
int llc_testlink_time;
/* link keep alive time */
u32 llc_termination_rsn;
/* rsn code for termination */
u8 nexthop_mac[ETH_ALEN];
u8 uses_gateway;
__be32 saddr;
/* net namespace */
struct net *net;
};
struct { /* SMC-D */
u64 peer_gid;
/* Peer GID (remote) */
struct smcd_dev *smcd;
/* ISM device for VLAN reg. */
u8 peer_shutdown : 1;
/* peer triggered shutdownn */
};
};
};
struct smc_clc_msg_local;
#define GID_LIST_SIZE 2
struct smc_gidlist {
u8 len;
u8 list[GID_LIST_SIZE][SMC_GID_SIZE];
};
struct smc_init_info_smcrv2 {
/* Input fields */
__be32 saddr;
struct sock *clc_sk;
__be32 daddr;
/* Output fields when saddr is set */
struct smc_ib_device *ib_dev_v2;
u8 ib_port_v2;
u8 ib_gid_v2[SMC_GID_SIZE];
/* Additional output fields when clc_sk and daddr is set as well */
u8 uses_gateway;
u8 nexthop_mac[ETH_ALEN];
struct smc_gidlist gidlist;
};
struct smc_init_info {
u8 is_smcd;
u8 smc_type_v1;
u8 smc_type_v2;
u8 first_contact_peer;
u8 first_contact_local;
unsigned short vlan_id;
u32 rc;
u8 negotiated_eid[SMC_MAX_EID_LEN];
/* SMC-R */
u8 smcr_version;
u8 check_smcrv2;
u8 peer_gid[SMC_GID_SIZE];
u8 peer_mac[ETH_ALEN];
u8 peer_systemid[SMC_SYSTEMID_LEN];
struct smc_ib_device *ib_dev;
u8 ib_gid[SMC_GID_SIZE];
u8 ib_port;
u32 ib_clcqpn;
struct smc_init_info_smcrv2 smcrv2;
/* SMC-D */
u64 ism_peer_gid[SMC_MAX_ISM_DEVS + 1];
struct smcd_dev *ism_dev[SMC_MAX_ISM_DEVS + 1];
u16 ism_chid[SMC_MAX_ISM_DEVS + 1];
u8 ism_offered_cnt; /* # of ISM devices offered */
u8 ism_selected; /* index of selected ISM dev*/
u8 smcd_version;
};
/* 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;
}
static inline bool smc_conn_lgr_valid(struct smc_connection *conn)
{
return conn->lgr && conn->alert_token_local;
}
/*
* Returns true if the specified link is usable.
*
* usable means the link is ready to receive RDMA messages, map memory
* on the link, etc. This doesn't ensure we are able to send RDMA messages
* on this link, if sending RDMA messages is needed, use smc_link_sendable()
*/
static inline bool smc_link_usable(struct smc_link *lnk)
{
if (lnk->state == SMC_LNK_UNUSED || lnk->state == SMC_LNK_INACTIVE)
return false;
return true;
}
/*
* Returns true if the specified link is ready to receive AND send RDMA
* messages.
*
* For the client side in first contact, the underlying QP may still in
* RESET or RTR when the link state is ACTIVATING, checks in smc_link_usable()
* is not strong enough. For those places that need to send any CDC or LLC
* messages, use smc_link_sendable(), otherwise, use smc_link_usable() instead
*/
static inline bool smc_link_sendable(struct smc_link *lnk)
{
return smc_link_usable(lnk) &&
lnk->qp_attr.cur_qp_state == IB_QPS_RTS;
}
static inline bool smc_link_active(struct smc_link *lnk)
{
return lnk->state == SMC_LNK_ACTIVE;
}
static inline void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)
{
sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
be16_to_cpu(((__be16 *)gid_raw)[0]),
be16_to_cpu(((__be16 *)gid_raw)[1]),
be16_to_cpu(((__be16 *)gid_raw)[2]),
be16_to_cpu(((__be16 *)gid_raw)[3]),
be16_to_cpu(((__be16 *)gid_raw)[4]),
be16_to_cpu(((__be16 *)gid_raw)[5]),
be16_to_cpu(((__be16 *)gid_raw)[6]),
be16_to_cpu(((__be16 *)gid_raw)[7]));
}
struct smc_pci_dev {
__u32 pci_fid;
__u16 pci_pchid;
__u16 pci_vendor;
__u16 pci_device;
__u8 pci_id[SMC_PCI_ID_STR_LEN];
};
static inline void smc_set_pci_values(struct pci_dev *pci_dev,
struct smc_pci_dev *smc_dev)
{
smc_dev->pci_vendor = pci_dev->vendor;
smc_dev->pci_device = pci_dev->device;
snprintf(smc_dev->pci_id, sizeof(smc_dev->pci_id), "%s",
pci_name(pci_dev));
#if IS_ENABLED(CONFIG_S390)
{ /* Set s390 specific PCI information */
struct zpci_dev *zdev;
zdev = to_zpci(pci_dev);
smc_dev->pci_fid = zdev->fid;
smc_dev->pci_pchid = zdev->pchid;
}
#endif
}
struct smc_sock;
struct smc_clc_msg_accept_confirm;
void smc_lgr_cleanup_early(struct smc_link_group *lgr);
void smc_lgr_terminate_sched(struct smc_link_group *lgr);
void smc_lgr_hold(struct smc_link_group *lgr);
void smc_lgr_put(struct smc_link_group *lgr);
void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport);
void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport);
void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid,
unsigned short vlan);
void smc_smcd_terminate_all(struct smcd_dev *dev);
void smc_smcr_terminate_all(struct smc_ib_device *smcibdev);
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_link *link,
struct smc_clc_msg_accept_confirm *clc);
int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey);
int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey);
void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
__be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey);
void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
__be64 nw_vaddr, __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, struct smc_init_info *ini);
void smc_conn_free(struct smc_connection *conn);
int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini);
void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr);
int smc_core_init(void);
void smc_core_exit(void);
int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
u8 link_idx, struct smc_init_info *ini);
void smcr_link_clear(struct smc_link *lnk, bool log);
void smcr_link_hold(struct smc_link *lnk);
void smcr_link_put(struct smc_link *lnk);
void smc_switch_link_and_count(struct smc_connection *conn,
struct smc_link *to_lnk);
int smcr_buf_map_lgr(struct smc_link *lnk);
int smcr_buf_reg_lgr(struct smc_link *lnk);
void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type);
void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
enum smc_lgr_type new_type, int asym_lnk_idx);
int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc);
struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
struct smc_link *from_lnk, bool is_dev_err);
void smcr_link_down_cond(struct smc_link *lnk);
void smcr_link_down_cond_sched(struct smc_link *lnk);
int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb);
int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb);
int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb);
int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb);
static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)
{
return link->lgr;
}
#endif
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