RDMA/irdma: Add connection manager

Add connection management (CM) implementation for
iWARP including accept, reject, connect, create_listen,
destroy_listen and CM utility functions

Link: https://lore.kernel.org/r/20210602205138.889-8-shiraz.saleem@intel.comSigned-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/irdma/cm.h

+/* SPDX-License-Identifier: GPL-2.0 or Linux-OpenIB */
+/* Copyright (c) 2015 - 2021 Intel Corporation */
+#ifndef IRDMA_CM_H
+#define IRDMA_CM_H
+
+#define IRDMA_MPA_REQUEST_ACCEPT	1
+#define IRDMA_MPA_REQUEST_REJECT	2
+
+/* IETF MPA -- defines */
+#define IEFT_MPA_KEY_REQ	"MPA ID Req Frame"
+#define IEFT_MPA_KEY_REP	"MPA ID Rep Frame"
+#define IETF_MPA_KEY_SIZE	16
+#define IETF_MPA_VER		1
+#define IETF_MAX_PRIV_DATA_LEN	512
+#define IETF_MPA_FRAME_SIZE	20
+#define IETF_RTR_MSG_SIZE	4
+#define IETF_MPA_V2_FLAG	0x10
+#define SNDMARKER_SEQNMASK	0x000001ff
+#define IRDMA_MAX_IETF_SIZE	32
+
+/* IETF RTR MSG Fields */
+#define IETF_PEER_TO_PEER	0x8000
+#define IETF_FLPDU_ZERO_LEN	0x4000
+#define IETF_RDMA0_WRITE	0x8000
+#define IETF_RDMA0_READ		0x4000
+#define IETF_NO_IRD_ORD		0x3fff
+
+#define MAX_PORTS	65536
+
+#define IRDMA_PASSIVE_STATE_INDICATED	0
+#define IRDMA_DO_NOT_SEND_RESET_EVENT	1
+#define IRDMA_SEND_RESET_EVENT		2
+
+#define MAX_IRDMA_IFS	4
+
+#define SET_ACK		1
+#define SET_SYN		2
+#define SET_FIN		4
+#define SET_RST		8
+
+#define TCP_OPTIONS_PADDING	3
+
+#define IRDMA_DEFAULT_RETRYS	64
+#define IRDMA_DEFAULT_RETRANS	8
+#define IRDMA_DEFAULT_TTL		0x40
+#define IRDMA_DEFAULT_RTT_VAR		6
+#define IRDMA_DEFAULT_SS_THRESH		0x3fffffff
+#define IRDMA_DEFAULT_REXMIT_THRESH	8
+
+#define IRDMA_RETRY_TIMEOUT	HZ
+#define IRDMA_SHORT_TIME	10
+#define IRDMA_LONG_TIME		(2 * HZ)
+#define IRDMA_MAX_TIMEOUT	((unsigned long)(12 * HZ))
+
+#define IRDMA_CM_HASHTABLE_SIZE		1024
+#define IRDMA_CM_TCP_TIMER_INTERVAL	3000
+#define IRDMA_CM_DEFAULT_MTU		1540
+#define IRDMA_CM_DEFAULT_FRAME_CNT	10
+#define IRDMA_CM_THREAD_STACK_SIZE	256
+#define IRDMA_CM_DEFAULT_RCV_WND	64240
+#define IRDMA_CM_DEFAULT_RCV_WND_SCALED	0x3FFFC
+#define IRDMA_CM_DEFAULT_RCV_WND_SCALE	2
+#define IRDMA_CM_DEFAULT_FREE_PKTS	10
+#define IRDMA_CM_FREE_PKT_LO_WATERMARK	2
+#define IRDMA_CM_DEFAULT_MSS		536
+#define IRDMA_CM_DEFAULT_MPA_VER	2
+#define IRDMA_CM_DEFAULT_SEQ		0x159bf75f
+#define IRDMA_CM_DEFAULT_LOCAL_ID	0x3b47
+#define IRDMA_CM_DEFAULT_SEQ2		0x18ed5740
+#define IRDMA_CM_DEFAULT_LOCAL_ID2	0xb807
+#define IRDMA_MAX_CM_BUF		(IRDMA_MAX_IETF_SIZE + IETF_MAX_PRIV_DATA_LEN)
+
+enum ietf_mpa_flags {
+	IETF_MPA_FLAGS_REJECT  = 0x20,
+	IETF_MPA_FLAGS_CRC     = 0x40,
+	IETF_MPA_FLAGS_MARKERS = 0x80,
+};
+
+enum irdma_timer_type {
+	IRDMA_TIMER_TYPE_SEND,
+	IRDMA_TIMER_TYPE_CLOSE,
+};
+
+enum option_nums {
+	OPTION_NUM_EOL,
+	OPTION_NUM_NONE,
+	OPTION_NUM_MSS,
+	OPTION_NUM_WINDOW_SCALE,
+	OPTION_NUM_SACK_PERM,
+	OPTION_NUM_SACK,
+	OPTION_NUM_WRITE0 = 0xbc,
+};
+
+/* cm node transition states */
+enum irdma_cm_node_state {
+	IRDMA_CM_STATE_UNKNOWN,
+	IRDMA_CM_STATE_INITED,
+	IRDMA_CM_STATE_LISTENING,
+	IRDMA_CM_STATE_SYN_RCVD,
+	IRDMA_CM_STATE_SYN_SENT,
+	IRDMA_CM_STATE_ONE_SIDE_ESTABLISHED,
+	IRDMA_CM_STATE_ESTABLISHED,
+	IRDMA_CM_STATE_ACCEPTING,
+	IRDMA_CM_STATE_MPAREQ_SENT,
+	IRDMA_CM_STATE_MPAREQ_RCVD,
+	IRDMA_CM_STATE_MPAREJ_RCVD,
+	IRDMA_CM_STATE_OFFLOADED,
+	IRDMA_CM_STATE_FIN_WAIT1,
+	IRDMA_CM_STATE_FIN_WAIT2,
+	IRDMA_CM_STATE_CLOSE_WAIT,
+	IRDMA_CM_STATE_TIME_WAIT,
+	IRDMA_CM_STATE_LAST_ACK,
+	IRDMA_CM_STATE_CLOSING,
+	IRDMA_CM_STATE_LISTENER_DESTROYED,
+	IRDMA_CM_STATE_CLOSED,
+};
+
+enum mpa_frame_ver {
+	IETF_MPA_V1 = 1,
+	IETF_MPA_V2 = 2,
+};
+
+enum mpa_frame_key {
+	MPA_KEY_REQUEST,
+	MPA_KEY_REPLY,
+};
+
+enum send_rdma0 {
+	SEND_RDMA_READ_ZERO  = 1,
+	SEND_RDMA_WRITE_ZERO = 2,
+};
+
+enum irdma_tcpip_pkt_type {
+	IRDMA_PKT_TYPE_UNKNOWN,
+	IRDMA_PKT_TYPE_SYN,
+	IRDMA_PKT_TYPE_SYNACK,
+	IRDMA_PKT_TYPE_ACK,
+	IRDMA_PKT_TYPE_FIN,
+	IRDMA_PKT_TYPE_RST,
+};
+
+enum irdma_cm_listener_state {
+	IRDMA_CM_LISTENER_PASSIVE_STATE = 1,
+	IRDMA_CM_LISTENER_ACTIVE_STATE  = 2,
+	IRDMA_CM_LISTENER_EITHER_STATE  = 3,
+};
+
+/* CM event codes */
+enum irdma_cm_event_type {
+	IRDMA_CM_EVENT_UNKNOWN,
+	IRDMA_CM_EVENT_ESTABLISHED,
+	IRDMA_CM_EVENT_MPA_REQ,
+	IRDMA_CM_EVENT_MPA_CONNECT,
+	IRDMA_CM_EVENT_MPA_ACCEPT,
+	IRDMA_CM_EVENT_MPA_REJECT,
+	IRDMA_CM_EVENT_MPA_ESTABLISHED,
+	IRDMA_CM_EVENT_CONNECTED,
+	IRDMA_CM_EVENT_RESET,
+	IRDMA_CM_EVENT_ABORTED,
+};
+
+struct irdma_bth { /* Base Trasnport Header */
+	u8 opcode;
+	u8 flags;
+	__be16 pkey;
+	__be32 qpn;
+	__be32 apsn;
+};
+
+struct ietf_mpa_v1 {
+	u8 key[IETF_MPA_KEY_SIZE];
+	u8 flags;
+	u8 rev;
+	__be16 priv_data_len;
+	u8 priv_data[];
+};
+
+struct ietf_rtr_msg {
+	__be16 ctrl_ird;
+	__be16 ctrl_ord;
+};
+
+struct ietf_mpa_v2 {
+	u8 key[IETF_MPA_KEY_SIZE];
+	u8 flags;
+	u8 rev;
+	__be16 priv_data_len;
+	struct ietf_rtr_msg rtr_msg;
+	u8 priv_data[];
+};
+
+struct option_base {
+	u8 optionnum;
+	u8 len;
+};
+
+struct option_mss {
+	u8 optionnum;
+	u8 len;
+	__be16 mss;
+};
+
+struct option_windowscale {
+	u8 optionnum;
+	u8 len;
+	u8 shiftcount;
+};
+
+union all_known_options {
+	char eol;
+	struct option_base base;
+	struct option_mss mss;
+	struct option_windowscale windowscale;
+};
+
+struct irdma_timer_entry {
+	struct list_head list;
+	unsigned long timetosend; /* jiffies */
+	struct irdma_puda_buf *sqbuf;
+	u32 type;
+	u32 retrycount;
+	u32 retranscount;
+	u32 context;
+	u32 send_retrans;
+	int close_when_complete;
+};
+
+/* CM context params */
+struct irdma_cm_tcp_context {
+	u8 client;
+	u32 loc_seq_num;
+	u32 loc_ack_num;
+	u32 rem_ack_num;
+	u32 rcv_nxt;
+	u32 loc_id;
+	u32 rem_id;
+	u32 snd_wnd;
+	u32 max_snd_wnd;
+	u32 rcv_wnd;
+	u32 mss;
+	u8 snd_wscale;
+	u8 rcv_wscale;
+};
+
+struct irdma_apbvt_entry {
+	struct hlist_node hlist;
+	u32 use_cnt;
+	u16 port;
+};
+
+struct irdma_cm_listener {
+	struct list_head list;
+	struct iw_cm_id *cm_id;
+	struct irdma_cm_core *cm_core;
+	struct irdma_device *iwdev;
+	struct list_head child_listen_list;
+	struct irdma_apbvt_entry *apbvt_entry;
+	enum irdma_cm_listener_state listener_state;
+	refcount_t refcnt;
+	atomic_t pend_accepts_cnt;
+	u32 loc_addr[4];
+	u32 reused_node;
+	int backlog;
+	u16 loc_port;
+	u16 vlan_id;
+	u8 loc_mac[ETH_ALEN];
+	u8 user_pri;
+	u8 tos;
+	bool qhash_set:1;
+	bool ipv4:1;
+};
+
+struct irdma_kmem_info {
+	void *addr;
+	u32 size;
+};
+
+struct irdma_mpa_priv_info {
+	const void *addr;
+	u32 size;
+};
+
+struct irdma_cm_node {
+	struct irdma_qp *iwqp;
+	struct irdma_device *iwdev;
+	struct irdma_sc_dev *dev;
+	struct irdma_cm_tcp_context tcp_cntxt;
+	struct irdma_cm_core *cm_core;
+	struct irdma_timer_entry *send_entry;
+	struct irdma_timer_entry *close_entry;
+	struct irdma_cm_listener *listener;
+	struct list_head timer_entry;
+	struct list_head reset_entry;
+	struct list_head teardown_entry;
+	struct irdma_apbvt_entry *apbvt_entry;
+	struct rcu_head rcu_head;
+	struct irdma_mpa_priv_info pdata;
+	struct irdma_sc_ah *ah;
+	union {
+		struct ietf_mpa_v1 mpa_frame;
+		struct ietf_mpa_v2 mpa_v2_frame;
+	};
+	struct irdma_kmem_info mpa_hdr;
+	struct iw_cm_id *cm_id;
+	struct hlist_node list;
+	struct completion establish_comp;
+	spinlock_t retrans_list_lock; /* protect CM node rexmit updates*/
+	atomic_t passive_state;
+	refcount_t refcnt;
+	enum irdma_cm_node_state state;
+	enum send_rdma0 send_rdma0_op;
+	enum mpa_frame_ver mpa_frame_rev;
+	u32 loc_addr[4], rem_addr[4];
+	u16 loc_port, rem_port;
+	int apbvt_set;
+	int accept_pend;
+	u16 vlan_id;
+	u16 ird_size;
+	u16 ord_size;
+	u16 mpav2_ird_ord;
+	u16 lsmm_size;
+	u8 pdata_buf[IETF_MAX_PRIV_DATA_LEN];
+	u8 loc_mac[ETH_ALEN];
+	u8 rem_mac[ETH_ALEN];
+	u8 user_pri;
+	u8 tos;
+	bool ack_rcvd:1;
+	bool qhash_set:1;
+	bool ipv4:1;
+	bool snd_mark_en:1;
+	bool rcv_mark_en:1;
+	bool do_lpb:1;
+	bool accelerated:1;
+};
+
+/* Used by internal CM APIs to pass CM information*/
+struct irdma_cm_info {
+	struct iw_cm_id *cm_id;
+	u16 loc_port;
+	u16 rem_port;
+	u32 loc_addr[4];
+	u32 rem_addr[4];
+	u32 qh_qpid;
+	u16 vlan_id;
+	int backlog;
+	u8 user_pri;
+	u8 tos;
+	bool ipv4;
+};
+
+struct irdma_cm_event {
+	enum irdma_cm_event_type type;
+	struct irdma_cm_info cm_info;
+	struct work_struct event_work;
+	struct irdma_cm_node *cm_node;
+};
+
+struct irdma_cm_core {
+	struct irdma_device *iwdev;
+	struct irdma_sc_dev *dev;
+	struct list_head listen_list;
+	DECLARE_HASHTABLE(cm_hash_tbl, 8);
+	DECLARE_HASHTABLE(apbvt_hash_tbl, 8);
+	struct timer_list tcp_timer;
+	struct workqueue_struct *event_wq;
+	spinlock_t ht_lock; /* protect CM node (active side) list */
+	spinlock_t listen_list_lock; /* protect listener list */
+	spinlock_t apbvt_lock; /*serialize apbvt add/del entries*/
+	u64 stats_nodes_created;
+	u64 stats_nodes_destroyed;
+	u64 stats_listen_created;
+	u64 stats_listen_destroyed;
+	u64 stats_listen_nodes_created;
+	u64 stats_listen_nodes_destroyed;
+	u64 stats_lpbs;
+	u64 stats_accepts;
+	u64 stats_rejects;
+	u64 stats_connect_errs;
+	u64 stats_passive_errs;
+	u64 stats_pkt_retrans;
+	u64 stats_backlog_drops;
+	struct irdma_puda_buf *(*form_cm_frame)(struct irdma_cm_node *cm_node,
+						struct irdma_kmem_info *options,
+						struct irdma_kmem_info *hdr,
+						struct irdma_mpa_priv_info *pdata,
+						u8 flags);
+	int (*cm_create_ah)(struct irdma_cm_node *cm_node, bool wait);
+	void (*cm_free_ah)(struct irdma_cm_node *cm_node);
+};
+
+int irdma_schedule_cm_timer(struct irdma_cm_node *cm_node,
+			    struct irdma_puda_buf *sqbuf,
+			    enum irdma_timer_type type, int send_retrans,
+			    int close_when_complete);
+int irdma_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param);
+int irdma_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len);
+int irdma_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param);
+int irdma_create_listen(struct iw_cm_id *cm_id, int backlog);
+int irdma_destroy_listen(struct iw_cm_id *cm_id);
+int irdma_add_arp(struct irdma_pci_f *rf, u32 *ip, bool ipv4, u8 *mac);
+void irdma_cm_teardown_connections(struct irdma_device *iwdev, u32 *ipaddr,
+				   struct irdma_cm_info *nfo,
+				   bool disconnect_all);
+int irdma_cm_start(struct irdma_device *dev);
+int irdma_cm_stop(struct irdma_device *dev);
+bool irdma_ipv4_is_lpb(u32 loc_addr, u32 rem_addr);
+bool irdma_ipv6_is_lpb(u32 *loc_addr, u32 *rem_addr);
+int irdma_arp_table(struct irdma_pci_f *rf, u32 *ip_addr, bool ipv4,
+		    u8 *mac_addr, u32 action);
+void irdma_if_notify(struct irdma_device *iwdev, struct net_device *netdev,
+		     u32 *ipaddr, bool ipv4, bool ifup);
+bool irdma_port_in_use(struct irdma_cm_core *cm_core, u16 port);
+void irdma_send_ack(struct irdma_cm_node *cm_node);
+void irdma_lpb_nop(struct irdma_sc_qp *qp);
+void irdma_rem_ref_cm_node(struct irdma_cm_node *cm_node);
+void irdma_add_conn_est_qh(struct irdma_cm_node *cm_node);
+#endif /* IRDMA_CM_H */