RDMA/erdma: Add verbs header file

This header file defines the main structures and functions used for RDMA
Verbs, including qp, cq, mr, ucontext, etc,.

Link: https://lore.kernel.org/r/20220727014927.76564-7-chengyou@linux.alibaba.com
Signed-off-by: Cheng Xu <chengyou@linux.alibaba.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

1 files changed, 342 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/erdma/erdma_verbs.h b/drivers/infiniband/hw/erdma/erdma_verbs.h
new file mode 100644
index 000000000000..c7baddb1f292
--- /dev/null
+++ b/drivers/infiniband/hw/erdma/erdma_verbs.h
@@ -0,0 +1,342 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+
+/* Authors: Cheng Xu <chengyou@linux.alibaba.com> */
+/*          Kai Shen <kaishen@linux.alibaba.com> */
+/* Copyright (c) 2020-2022, Alibaba Group. */
+
+#ifndef __ERDMA_VERBS_H__
+#define __ERDMA_VERBS_H__
+
+#include <linux/errno.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_user_verbs.h>
+#include <rdma/iw_cm.h>
+
+#include "erdma.h"
+#include "erdma_cm.h"
+#include "erdma_hw.h"
+
+/* RDMA Capability. */
+#define ERDMA_MAX_PD (128 * 1024)
+#define ERDMA_MAX_SEND_WR 4096
+#define ERDMA_MAX_ORD 128
+#define ERDMA_MAX_IRD 128
+#define ERDMA_MAX_SGE_RD 1
+#define ERDMA_MAX_CONTEXT (128 * 1024)
+#define ERDMA_MAX_SEND_SGE 6
+#define ERDMA_MAX_RECV_SGE 1
+#define ERDMA_MAX_INLINE (sizeof(struct erdma_sge) * (ERDMA_MAX_SEND_SGE))
+#define ERDMA_MAX_FRMR_PA 512
+
+enum {
+	ERDMA_MMAP_IO_NC = 0, /* no cache */
+};
+
+struct erdma_user_mmap_entry {
+	struct rdma_user_mmap_entry rdma_entry;
+	u64 address;
+	u8 mmap_flag;
+};
+
+struct erdma_ucontext {
+	struct ib_ucontext ibucontext;
+
+	u32 sdb_type;
+	u32 sdb_idx;
+	u32 sdb_page_idx;
+	u32 sdb_page_off;
+	u64 sdb;
+	u64 rdb;
+	u64 cdb;
+
+	struct rdma_user_mmap_entry *sq_db_mmap_entry;
+	struct rdma_user_mmap_entry *rq_db_mmap_entry;
+	struct rdma_user_mmap_entry *cq_db_mmap_entry;
+
+	/* doorbell records */
+	struct list_head dbrecords_page_list;
+	struct mutex dbrecords_page_mutex;
+};
+
+struct erdma_pd {
+	struct ib_pd ibpd;
+	u32 pdn;
+};
+
+/*
+ * MemoryRegion definition.
+ */
+#define ERDMA_MAX_INLINE_MTT_ENTRIES 4
+#define MTT_SIZE(mtt_cnt) (mtt_cnt << 3) /* per mtt takes 8 Bytes. */
+#define ERDMA_MR_MAX_MTT_CNT 524288
+#define ERDMA_MTT_ENTRY_SIZE 8
+
+#define ERDMA_MR_TYPE_NORMAL 0
+#define ERDMA_MR_TYPE_FRMR 1
+#define ERDMA_MR_TYPE_DMA 2
+
+#define ERDMA_MR_INLINE_MTT 0
+#define ERDMA_MR_INDIRECT_MTT 1
+
+#define ERDMA_MR_ACC_LR BIT(0)
+#define ERDMA_MR_ACC_LW BIT(1)
+#define ERDMA_MR_ACC_RR BIT(2)
+#define ERDMA_MR_ACC_RW BIT(3)
+
+static inline u8 to_erdma_access_flags(int access)
+{
+	return (access & IB_ACCESS_REMOTE_READ ? ERDMA_MR_ACC_RR : 0) |
+	       (access & IB_ACCESS_LOCAL_WRITE ? ERDMA_MR_ACC_LW : 0) |
+	       (access & IB_ACCESS_REMOTE_WRITE ? ERDMA_MR_ACC_RW : 0);
+}
+
+struct erdma_mem {
+	struct ib_umem *umem;
+	void *mtt_buf;
+	u32 mtt_type;
+	u32 page_size;
+	u32 page_offset;
+	u32 page_cnt;
+	u32 mtt_nents;
+
+	u64 va;
+	u64 len;
+
+	u64 mtt_entry[ERDMA_MAX_INLINE_MTT_ENTRIES];
+};
+
+struct erdma_mr {
+	struct ib_mr ibmr;
+	struct erdma_mem mem;
+	u8 type;
+	u8 access;
+	u8 valid;
+};
+
+struct erdma_user_dbrecords_page {
+	struct list_head list;
+	struct ib_umem *umem;
+	u64 va;
+	int refcnt;
+};
+
+struct erdma_uqp {
+	struct erdma_mem sq_mtt;
+	struct erdma_mem rq_mtt;
+
+	dma_addr_t sq_db_info_dma_addr;
+	dma_addr_t rq_db_info_dma_addr;
+
+	struct erdma_user_dbrecords_page *user_dbr_page;
+
+	u32 rq_offset;
+};
+
+struct erdma_kqp {
+	u16 sq_pi;
+	u16 sq_ci;
+
+	u16 rq_pi;
+	u16 rq_ci;
+
+	u64 *swr_tbl;
+	u64 *rwr_tbl;
+
+	void __iomem *hw_sq_db;
+	void __iomem *hw_rq_db;
+
+	void *sq_buf;
+	dma_addr_t sq_buf_dma_addr;
+
+	void *rq_buf;
+	dma_addr_t rq_buf_dma_addr;
+
+	void *sq_db_info;
+	void *rq_db_info;
+
+	u8 sig_all;
+};
+
+enum erdma_qp_state {
+	ERDMA_QP_STATE_IDLE = 0,
+	ERDMA_QP_STATE_RTR = 1,
+	ERDMA_QP_STATE_RTS = 2,
+	ERDMA_QP_STATE_CLOSING = 3,
+	ERDMA_QP_STATE_TERMINATE = 4,
+	ERDMA_QP_STATE_ERROR = 5,
+	ERDMA_QP_STATE_UNDEF = 7,
+	ERDMA_QP_STATE_COUNT = 8
+};
+
+enum erdma_qp_attr_mask {
+	ERDMA_QP_ATTR_STATE = (1 << 0),
+	ERDMA_QP_ATTR_LLP_HANDLE = (1 << 2),
+	ERDMA_QP_ATTR_ORD = (1 << 3),
+	ERDMA_QP_ATTR_IRD = (1 << 4),
+	ERDMA_QP_ATTR_SQ_SIZE = (1 << 5),
+	ERDMA_QP_ATTR_RQ_SIZE = (1 << 6),
+	ERDMA_QP_ATTR_MPA = (1 << 7)
+};
+
+struct erdma_qp_attrs {
+	enum erdma_qp_state state;
+	enum erdma_cc_alg cc; /* Congestion control algorithm */
+	u32 sq_size;
+	u32 rq_size;
+	u32 orq_size;
+	u32 irq_size;
+	u32 max_send_sge;
+	u32 max_recv_sge;
+	u32 cookie;
+#define ERDMA_QP_ACTIVE 0
+#define ERDMA_QP_PASSIVE 1
+	u8 qp_type;
+	u8 pd_len;
+};
+
+struct erdma_qp {
+	struct ib_qp ibqp;
+	struct kref ref;
+	struct completion safe_free;
+	struct erdma_dev *dev;
+	struct erdma_cep *cep;
+	struct rw_semaphore state_lock;
+
+	union {
+		struct erdma_kqp kern_qp;
+		struct erdma_uqp user_qp;
+	};
+
+	struct erdma_cq *scq;
+	struct erdma_cq *rcq;
+
+	struct erdma_qp_attrs attrs;
+	spinlock_t lock;
+};
+
+struct erdma_kcq_info {
+	void *qbuf;
+	dma_addr_t qbuf_dma_addr;
+	u32 ci;
+	u32 cmdsn;
+	u32 notify_cnt;
+
+	spinlock_t lock;
+	u8 __iomem *db;
+	u64 *db_record;
+};
+
+struct erdma_ucq_info {
+	struct erdma_mem qbuf_mtt;
+	struct erdma_user_dbrecords_page *user_dbr_page;
+	dma_addr_t db_info_dma_addr;
+};
+
+struct erdma_cq {
+	struct ib_cq ibcq;
+	u32 cqn;
+
+	u32 depth;
+	u32 assoc_eqn;
+
+	union {
+		struct erdma_kcq_info kern_cq;
+		struct erdma_ucq_info user_cq;
+	};
+};
+
+#define QP_ID(qp) ((qp)->ibqp.qp_num)
+
+static inline struct erdma_qp *find_qp_by_qpn(struct erdma_dev *dev, int id)
+{
+	return (struct erdma_qp *)xa_load(&dev->qp_xa, id);
+}
+
+static inline struct erdma_cq *find_cq_by_cqn(struct erdma_dev *dev, int id)
+{
+	return (struct erdma_cq *)xa_load(&dev->cq_xa, id);
+}
+
+void erdma_qp_get(struct erdma_qp *qp);
+void erdma_qp_put(struct erdma_qp *qp);
+int erdma_modify_qp_internal(struct erdma_qp *qp, struct erdma_qp_attrs *attrs,
+			     enum erdma_qp_attr_mask mask);
+void erdma_qp_llp_close(struct erdma_qp *qp);
+void erdma_qp_cm_drop(struct erdma_qp *qp);
+
+static inline struct erdma_ucontext *to_ectx(struct ib_ucontext *ibctx)
+{
+	return container_of(ibctx, struct erdma_ucontext, ibucontext);
+}
+
+static inline struct erdma_pd *to_epd(struct ib_pd *pd)
+{
+	return container_of(pd, struct erdma_pd, ibpd);
+}
+
+static inline struct erdma_mr *to_emr(struct ib_mr *ibmr)
+{
+	return container_of(ibmr, struct erdma_mr, ibmr);
+}
+
+static inline struct erdma_qp *to_eqp(struct ib_qp *qp)
+{
+	return container_of(qp, struct erdma_qp, ibqp);
+}
+
+static inline struct erdma_cq *to_ecq(struct ib_cq *ibcq)
+{
+	return container_of(ibcq, struct erdma_cq, ibcq);
+}
+
+static inline struct erdma_user_mmap_entry *
+to_emmap(struct rdma_user_mmap_entry *ibmmap)
+{
+	return container_of(ibmmap, struct erdma_user_mmap_entry, rdma_entry);
+}
+
+int erdma_alloc_ucontext(struct ib_ucontext *ibctx, struct ib_udata *data);
+void erdma_dealloc_ucontext(struct ib_ucontext *ibctx);
+int erdma_query_device(struct ib_device *dev, struct ib_device_attr *attr,
+		       struct ib_udata *data);
+int erdma_get_port_immutable(struct ib_device *dev, u32 port,
+			     struct ib_port_immutable *ib_port_immutable);
+int erdma_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
+		    struct ib_udata *data);
+int erdma_query_port(struct ib_device *dev, u32 port,
+		     struct ib_port_attr *attr);
+int erdma_query_gid(struct ib_device *dev, u32 port, int idx,
+		    union ib_gid *gid);
+int erdma_alloc_pd(struct ib_pd *ibpd, struct ib_udata *data);
+int erdma_dealloc_pd(struct ib_pd *ibpd, struct ib_udata *udata);
+int erdma_create_qp(struct ib_qp *ibqp, struct ib_qp_init_attr *attr,
+		    struct ib_udata *data);
+int erdma_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int mask,
+		   struct ib_qp_init_attr *init_attr);
+int erdma_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int mask,
+		    struct ib_udata *data);
+int erdma_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata);
+int erdma_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata);
+int erdma_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags);
+struct ib_mr *erdma_reg_user_mr(struct ib_pd *ibpd, u64 start, u64 len,
+				u64 virt, int access, struct ib_udata *udata);
+struct ib_mr *erdma_get_dma_mr(struct ib_pd *ibpd, int rights);
+int erdma_dereg_mr(struct ib_mr *ibmr, struct ib_udata *data);
+int erdma_mmap(struct ib_ucontext *ctx, struct vm_area_struct *vma);
+void erdma_mmap_free(struct rdma_user_mmap_entry *rdma_entry);
+void erdma_qp_get_ref(struct ib_qp *ibqp);
+void erdma_qp_put_ref(struct ib_qp *ibqp);
+struct ib_qp *erdma_get_ibqp(struct ib_device *dev, int id);
+int erdma_post_send(struct ib_qp *ibqp, const struct ib_send_wr *send_wr,
+		    const struct ib_send_wr **bad_send_wr);
+int erdma_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *recv_wr,
+		    const struct ib_recv_wr **bad_recv_wr);
+int erdma_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc);
+struct ib_mr *erdma_ib_alloc_mr(struct ib_pd *ibpd, enum ib_mr_type mr_type,
+				u32 max_num_sg);
+int erdma_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
+		    unsigned int *sg_offset);
+void erdma_port_event(struct erdma_dev *dev, enum ib_event_type reason);
+
+#endif