From: Bernard Metzler <bmt@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Bernard Metzler <bmt@xxxxxxxxxxxxxx>
---
drivers/infiniband/sw/siw/siw.h | 733 ++++++++++++++++++++++++++++++++
1 file changed, 733 insertions(+)
create mode 100644 drivers/infiniband/sw/siw/siw.h
diff --git a/drivers/infiniband/sw/siw/siw.h b/drivers/infiniband/sw/siw/siw.h
new file mode 100644
index 000000000000..9a3c2abbd858
--- /dev/null
+++ b/drivers/infiniband/sw/siw/siw.h
@@ -0,0 +1,733 @@
+/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
+
+/* Authors: Bernard Metzler <bmt@xxxxxxxxxxxxxx> */
+/* Copyright (c) 2008-2019, IBM Corporation */
+
+#ifndef _SIW_H
+#define _SIW_H
+
+#include <linux/idr.h>
+#include <rdma/ib_verbs.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/fs.h>
+#include <linux/netdevice.h>
+#include <crypto/hash.h>
+#include <linux/resource.h> /* MLOCK_LIMIT */
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/llist.h>
+#include <linux/mm.h>
+#include <linux/sched/signal.h>
+
+#include <rdma/siw_user.h>
+#include "iwarp.h"
+
+/* driver debugging enabled */
+#define DEBUG
+
+#define SIW_VENDOR_ID 0x626d74 /* ascii 'bmt' for now */
+#define SIW_VENDORT_PART_ID 0
+#define SIW_MAX_QP (1024 * 100)
+#define SIW_MAX_QP_WR (1024 * 32)
+#define SIW_MAX_ORD_QP 128
+#define SIW_MAX_IRD_QP 128
+#define SIW_MAX_SGE_PBL 256 /* max num sge's for PBL */
+#define SIW_MAX_SGE_RD 1 /* iwarp limitation. we could relax */
+#define SIW_MAX_CQ (1024 * 100)
+#define SIW_MAX_CQE (SIW_MAX_QP_WR * 100)
+#define SIW_MAX_MR (SIW_MAX_QP * 10)
+#define SIW_MAX_PD SIW_MAX_QP
+#define SIW_MAX_MW 0 /* to be set if MW's are supported */
+#define SIW_MAX_FMR SIW_MAX_MR
+#define SIW_MAX_SRQ SIW_MAX_QP
+#define SIW_MAX_SRQ_WR (SIW_MAX_QP_WR * 10)
+#define SIW_MAX_CONTEXT SIW_MAX_PD
+
+/* Min number of bytes for using zero copy transmit */
+#define SENDPAGE_THRESH PAGE_SIZE
+
+/* Maximum number of frames which can be send in one SQ processing */
+#define SQ_USER_MAXBURST 100
+
+/* Maximum number of consecutive IRQ elements which get served
+ * if SQ has pending work. Prevents starving local SQ processing
+ * by serving peer Read Requests.
+ */
+#define SIW_IRQ_MAXBURST_SQ_ACTIVE 4
+
+struct siw_dev_cap {
+ int max_qp;
+ int max_qp_wr;
+ int max_ord; /* max. outbound read queue depth */
+ int max_ird; /* max. inbound read queue depth */
+ int max_sge;
+ int max_sge_rd;
+ int max_cq;
+ int max_cqe;
+ int max_mr;
+ int max_pd;
+ int max_mw;
+ int max_fmr;
+ int max_srq;
+ int max_srq_wr;
+ int max_srq_sge;
+};
+
+struct siw_device {
+ struct ib_device base_dev;
+ struct net_device *netdev;
+ struct siw_dev_cap attrs;
+
+ u32 vendor_part_id;
+ int numa_node;
+
+ /* physical port state (only one port per device) */
+ enum ib_port_state state;
+
+ spinlock_t lock;
+
+ /* object management */
+ struct idr qp_idr;
+ struct idr mem_idr;
+
+ struct list_head cep_list;
+ struct list_head qp_list;
+ struct list_head mr_list;
+
+ /* active objects statistics */
+ atomic_t num_qp;
+ atomic_t num_cq;
+ atomic_t num_pd;
+ atomic_t num_mr;
+ atomic_t num_srq;
+ atomic_t num_cep;
+ atomic_t num_ctx;
+
+ struct work_struct netdev_down;
+};
+
+struct siw_uobj {
+ void *addr;
+ u32 size;
+};
+
+struct siw_ucontext {
+ struct ib_ucontext base_ucontext;
+ struct siw_device *sdev;
+
+ /* xarray of user mappable objects */
+ struct xarray xa;
+ u32 uobj_nextkey;
+};
+
+struct siw_pd {
+ struct ib_pd base_pd;
+ struct siw_device *sdev;
+};
+
+/*
+ * The RDMA core does not define LOCAL_READ access, which is always
+ * enabled implictely.
+ */
+#define IWARP_ACCESS_MASK \
+ (IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_WRITE | \
+ IB_ACCESS_REMOTE_READ)
+
+struct siw_mr;
+
+/*
+ * siw presentation of user memory registered as source
+ * or target of RDMA operations.
+ */
+
+struct siw_page_chunk {
+ struct page **p;
+};
+
+struct siw_umem {
+ struct siw_page_chunk *page_chunk;
+ int num_pages;
+ bool writable;
+ u64 fp_addr; /* First page base address */
+ struct mm_struct *owning_mm;
+};
+
+struct siw_pble {
+ u64 addr; /* Address of assigned user buffer */
+ u64 size; /* Size of this entry */
+ u64 pbl_off; /* Total offset from start of PBL */
+};
+
+struct siw_pbl {
+ unsigned int num_buf;
+ unsigned int max_buf;
+ struct siw_pble pbe[1];
+};
+
+/*
+ * Generic memory representation for registered siw memory.
+ * Memory lookup always via higher 24 bit of STag (STag index).
+ * Object relates to memory window if embedded mr pointer is valid
+ */
+struct siw_mem {
+ struct siw_device *sdev;
+ struct kref ref;
+ struct siw_mr *mr; /* assoc. MR if MW, NULL if MR */
+ u64 va; /* VA of memory */
+ u64 len; /* amount of memory bytes */
+ u32 stag; /* iWarp memory access steering tag */
+ u8 stag_valid; /* VALID or INVALID */
+ u8 is_pbl; /* PBL or user space mem */
+
+ enum ib_access_flags perms; /* local/remote READ & WRITE */
+};
+
+#define SIW_MEM_IS_MW(m) ((m)->mr != NULL)
+
+/*
+ * MR and MW definition.
+ * Used RDMA base structs ib_mr/ib_mw holding:
+ * lkey, rkey, MW reference count on MR
+ */
+struct siw_mr {
+ struct ib_mr base_mr;
+ struct siw_mem mem;
+ struct list_head devq;
+ struct rcu_head rcu;
+ union {
+ struct siw_umem *umem;
+ struct siw_pbl *pbl;
+ void *mem_obj;
+ };
+ struct siw_pd *pd;
+};
+
+struct siw_mw {
+ struct ib_mw base_mw;
+ struct siw_mem mem;
+ struct rcu_head rcu;
+};
+
+/*
+ * Error codes for local or remote
+ * access to registered memory
+ */
+enum siw_access_state {
+ E_ACCESS_OK = 0,
+ E_STAG_INVALID,
+ E_BASE_BOUNDS,
+ E_ACCESS_PERM,
+ E_PD_MISMATCH
+};
+
+enum siw_wr_state {
+ SIW_WR_IDLE = 0,
+ SIW_WR_QUEUED = 1, /* processing has not started yet */
+ SIW_WR_INPROGRESS = 2 /* initiated processing of the WR */
+};
+
+/* The WQE currently being processed (RX or TX) */
+struct siw_wqe {
+ /* Copy of applications SQE or RQE */
+ union {
+ struct siw_sqe sqe;
+ struct siw_rqe rqe;
+ };
+ struct siw_mem *mem[SIW_MAX_SGE]; /* per sge's resolved mem */
+ enum siw_wr_state wr_status;
+ enum siw_wc_status wc_status;
+ u32 bytes; /* total bytes to process */
+ u32 processed; /* bytes processed */
+};
+
+struct siw_cq {
+ struct ib_cq base_cq;
+ struct siw_device *sdev;
+ spinlock_t lock;
+ u64 *notify;
+ struct siw_cqe *queue;
+ u32 cq_put;
+ u32 cq_get;
+ u32 num_cqe;
+ bool kernel_verbs;
+ u32 xa_cq_index; /* mmap information for CQE array */
+ u32 id; /* For debugging only */
+};
+
+enum siw_qp_state {
+ SIW_QP_STATE_IDLE = 0,
+ SIW_QP_STATE_RTR = 1,
+ SIW_QP_STATE_RTS = 2,
+ SIW_QP_STATE_CLOSING = 3,
+ SIW_QP_STATE_TERMINATE = 4,
+ SIW_QP_STATE_ERROR = 5,
+ SIW_QP_STATE_COUNT = 6
+};
+
+enum siw_qp_flags {
+ SIW_RDMA_BIND_ENABLED = (1 << 0),
+ SIW_RDMA_WRITE_ENABLED = (1 << 1),
+ SIW_RDMA_READ_ENABLED = (1 << 2),
+ SIW_SIGNAL_ALL_WR = (1 << 3),
+ SIW_MPA_CRC = (1 << 4),
+ SIW_QP_IN_DESTROY = (1 << 5)
+};
+
+enum siw_qp_attr_mask {
+ SIW_QP_ATTR_STATE = (1 << 0),
+ SIW_QP_ATTR_ACCESS_FLAGS = (1 << 1),
+ SIW_QP_ATTR_LLP_HANDLE = (1 << 2),
+ SIW_QP_ATTR_ORD = (1 << 3),
+ SIW_QP_ATTR_IRD = (1 << 4),
+ SIW_QP_ATTR_SQ_SIZE = (1 << 5),
+ SIW_QP_ATTR_RQ_SIZE = (1 << 6),
+ SIW_QP_ATTR_MPA = (1 << 7)
+};
+
+struct siw_sk_upcalls {
+ void (*sk_state_change)(struct sock *sk);
+ void (*sk_data_ready)(struct sock *sk, int bytes);
+ void (*sk_write_space)(struct sock *sk);
+ void (*sk_error_report)(struct sock *sk);
+};
+
+struct siw_srq {
+ struct ib_srq base_srq;
+ struct siw_pd *pd;
+ spinlock_t lock;
+ u32 max_sge;
+ u32 limit; /* low watermark for async event */
+ struct siw_rqe *recvq;
+ u32 rq_put;
+ u32 rq_get;
+ u32 num_rqe; /* max # of wqe's allowed */
+ u32 xa_srq_index; /* mmap information for SRQ array */
+ char armed; /* inform user if limit hit */
+ char kernel_verbs; /* '1' if kernel client */
+};
+
+struct siw_qp_attrs {
+ enum siw_qp_state state;
+ u32 sq_size;
+ u32 rq_size;
+ u32 orq_size;
+ u32 irq_size;
+ u32 sq_max_sges;
+ u32 rq_max_sges;
+ enum siw_qp_flags flags;
+
+ struct socket *sk;
+};
+
+enum siw_tx_ctx {
+ SIW_SEND_HDR = 0, /* start or continue sending HDR */
+ SIW_SEND_DATA = 1, /* start or continue sending DDP payload */
+ SIW_SEND_TRAILER = 2, /* start or continue sending TRAILER */
+ SIW_SEND_SHORT_FPDU = 3 /* send whole FPDU hdr|data|trailer at once */
+};
+
+enum siw_rx_state {
+ SIW_GET_HDR = 0, /* await new hdr or within hdr */
+ SIW_GET_DATA_START = 1, /* start of inbound DDP payload */
+ SIW_GET_DATA_MORE = 2, /* continuation of (misaligned) DDP payload */
+ SIW_GET_TRAILER = 3 /* await new trailer or within trailer */
+};
+
+struct siw_iwarp_rx {
+ struct sk_buff *skb;
+ union iwarp_hdr hdr;
+ struct mpa_trailer trailer;
+ /*
+ * local destination memory of inbound iwarp operation.
+ * valid, according to wqe->wr_status
+ */
+ struct siw_wqe wqe_active;
+
+ struct shash_desc *mpa_crc_hd;
+ /*
+ * Next expected DDP MSN for each QN +
+ * expected steering tag +
+ * expected DDP tagget offset (all HBO)
+ */
+ u32 ddp_msn[RDMAP_UNTAGGED_QN_COUNT];
+ u32 ddp_stag;
+ u64 ddp_to;
+
+ /*
+ * For each FPDU, main RX loop runs through 3 stages:
+ * Receiving protocol headers, placing DDP payload and receiving
+ * trailer information (CRC + eventual padding).
+ * Next two variables keep state on receive status of the
+ * current FPDU part (hdr, data, trailer).
+ */
+ int fpdu_part_rcvd; /* bytes in pkt part copied */
+ int fpdu_part_rem; /* bytes in pkt part not seen */
+
+ int skb_new; /* pending unread bytes in skb */
+ int skb_offset; /* offset in skb */
+ int skb_copied; /* processed bytes in skb */
+
+ int pbl_idx; /* Index into current PBL */
+
+ int sge_idx; /* current sge in rx */
+ unsigned int sge_off; /* already rcvd in curr. sge */
+
+ enum siw_rx_state state;
+
+ u32 inval_stag; /* Stag to be invalidated */
+
+ u8 first_ddp_seg : 1, /* this is first DDP seg */
+ more_ddp_segs : 1, /* more DDP segs expected */
+ rx_suspend : 1, /* stop rcv DDP segs. */
+ unused : 1, prev_rdmap_opcode : 4; /* opcode of prev msg */
+ char pad; /* # of pad bytes expected */
+};
+
+#define siw_rx_data(qp, ctx) \
+ (iwarp_pktinfo[__rdmap_get_opcode(&ctx->hdr.ctrl)].proc_data(qp, ctx))
+
+/*
+ * Shorthands for short packets w/o payload
+ * to be transmitted more efficient.
+ */
+struct siw_send_pkt {
+ struct iwarp_send send;
+ __be32 crc;
+};
+
+struct siw_write_pkt {
+ struct iwarp_rdma_write write;
+ __be32 crc;
+};
+
+struct siw_rreq_pkt {
+ struct iwarp_rdma_rreq rreq;
+ __be32 crc;
+};
+
+struct siw_rresp_pkt {
+ struct iwarp_rdma_rresp rresp;
+ __be32 crc;
+};
+
+struct siw_iwarp_tx {
+ union {
+ union iwarp_hdr hdr;
+
+ /* Generic part of FPDU header */
+ struct iwarp_ctrl ctrl;
+ struct iwarp_ctrl_untagged c_untagged;
+ struct iwarp_ctrl_tagged c_tagged;
+
+ /* FPDU headers */
+ struct iwarp_rdma_write rwrite;
+ struct iwarp_rdma_rreq rreq;
+ struct iwarp_rdma_rresp rresp;
+ struct iwarp_terminate terminate;
+ struct iwarp_send send;
+ struct iwarp_send_inv send_inv;
+
+ /* complete short FPDUs */
+ struct siw_send_pkt send_pkt;
+ struct siw_write_pkt write_pkt;
+ struct siw_rreq_pkt rreq_pkt;
+ struct siw_rresp_pkt rresp_pkt;
+ } pkt;
+
+ struct mpa_trailer trailer;
+ /* DDP MSN for untagged messages */
+ u32 ddp_msn[RDMAP_UNTAGGED_QN_COUNT];
+
+ enum siw_tx_ctx state;
+ u16 ctrl_len; /* ddp+rdmap hdr */
+ u16 ctrl_sent;
+ int burst;
+ int bytes_unsent; /* ddp payload bytes */
+
+ struct shash_desc *mpa_crc_hd;
+
+ u8 do_crc : 1, /* do crc for segment */
+ use_sendpage : 1, /* send w/o copy */
+ tx_suspend : 1, /* stop sending DDP segs. */
+ pad : 2, /* # pad in current fpdu */
+ orq_fence : 1, /* ORQ full or Send fenced */
+ in_syscall : 1, /* TX out of user context */
+ zcopy_tx : 1; /* Use TCP_SENDPAGE if possible */
+ u8 gso_seg_limit; /* Maximum segments for GSO, 0 = unbound */
+
+ u16 fpdu_len; /* len of FPDU to tx */
+ unsigned int tcp_seglen; /* remaining tcp seg space */
+
+ struct siw_wqe wqe_active;
+
+ int pbl_idx; /* Index into current PBL */
+ int sge_idx; /* current sge in tx */
+ u32 sge_off; /* already sent in curr. sge */
+};
+
+struct siw_qp {
+ struct ib_qp base_qp;
+ struct siw_device *sdev;
+ struct kref ref;
+ struct list_head devq;
+ int tx_cpu;
+ bool kernel_verbs;
+ struct siw_qp_attrs attrs;
+
+ struct siw_cep *cep;
+ struct rw_semaphore state_lock;
+
+ struct siw_pd *pd;
+ struct siw_cq *scq;
+ struct siw_cq *rcq;
+ struct siw_srq *srq;
+
+ struct siw_iwarp_tx tx_ctx; /* Transmit context */
+ spinlock_t sq_lock;
+ struct siw_sqe *sendq; /* send queue element array */
+ uint32_t sq_get; /* consumer index into sq array */
+ uint32_t sq_put; /* kernel prod. index into sq array */
+ struct llist_node tx_list;
+
+ struct siw_sqe *orq; /* outbound read queue element array */
+ spinlock_t orq_lock;
+ uint32_t orq_get; /* consumer index into orq array */
+ uint32_t orq_put; /* shared producer index for ORQ */
+
+ struct siw_iwarp_rx rx_ctx; /* Receive context */
+ spinlock_t rq_lock;
+ struct siw_rqe *recvq; /* recv queue element array */
+ uint32_t rq_get; /* consumer index into rq array */
+ uint32_t rq_put; /* kernel prod. index into rq array */
+
+ struct siw_sqe *irq; /* inbound read queue element array */
+ uint32_t irq_get; /* consumer index into irq array */
+ uint32_t irq_put; /* producer index into irq array */
+ int irq_burst;
+
+ struct { /* information to be carried in TERMINATE pkt, if valid */
+ u8 valid;
+ u8 in_tx;
+ u8 layer : 4, etype : 4;
+ u8 ecode;
+ } term_info;
+ u32 xa_sq_index; /* mmap information for SQE array */
+ u32 xa_rq_index; /* mmap information for RQE array */
+ u32 id; /* ID for debugging only */
+};
+
+/* helper macros */
+#define rx_qp(rx) container_of(rx, struct siw_qp, rx_ctx)
+#define tx_qp(tx) container_of(tx, struct siw_qp, tx_ctx)
+#define tx_wqe(qp) (&(qp)->tx_ctx.wqe_active)
+#define rx_wqe(qp) (&(qp)->rx_ctx.wqe_active)
+#define rx_mem(qp) ((qp)->rx_ctx.wqe_active.mem[0])
+#define tx_type(wqe) ((wqe)->sqe.opcode)
+#define rx_type(wqe) ((wqe)->rqe.opcode)
+#define tx_flags(wqe) ((wqe)->sqe.flags)
+
+struct iwarp_msg_info {
+ int hdr_len;
+ struct iwarp_ctrl ctrl;
+ int (*proc_data)(struct siw_qp *qp, struct siw_iwarp_rx *rctx);
+};
+
+/* Global siw parameters. Currently set in siw_main.c */
+extern const bool zcopy_tx;
+extern const u8 gso_seg_limit;
+extern const bool loopback_enabled;
+extern const bool mpa_crc_required;
+extern const bool mpa_crc_strict;
+extern const bool siw_tcp_nagle;
+extern u_char mpa_version;
+extern const bool peer_to_peer;
+
+extern struct crypto_shash *siw_crypto_shash;
+extern struct task_struct *siw_tx_thread[];
+extern struct iwarp_msg_info iwarp_pktinfo[RDMAP_TERMINATE + 1];
+
+/* QP general functions */
+extern int siw_qp_modify(struct siw_qp *qp, struct siw_qp_attrs *attr,
+ enum siw_qp_attr_mask mask);
+extern int siw_qp_mpa_rts(struct siw_qp *qp, enum mpa_v2_ctrl ctrl);
+extern void siw_qp_llp_close(struct siw_qp *qp);
+extern void siw_qp_cm_drop(struct siw_qp *qp, int schedule);
+extern void siw_send_terminate(struct siw_qp *qp);
+
+extern struct ib_qp *siw_get_base_qp(struct ib_device *base_dev, int id);
+extern void siw_qp_get_ref(struct ib_qp *qp);
+extern void siw_qp_put_ref(struct ib_qp *qp);
+extern int siw_qp_add(struct siw_device *sdev, struct siw_qp *qp);
+extern void siw_free_qp(struct kref *ref);
+
+extern void siw_init_terminate(struct siw_qp *qp, enum term_elayer layer,
+ u8 etype, u8 ecode, int in_tx);
+extern enum ddp_ecode siw_tagged_error(enum siw_access_state state);
+extern enum rdmap_ecode siw_rdmap_error(enum siw_access_state state);
+
+extern void siw_read_to_orq(struct siw_sqe *rreq, struct siw_sqe *sqe);
+extern int siw_sqe_complete(struct siw_qp *qp, struct siw_sqe *sqe, u32 bytes,
+ enum siw_wc_status status);
+extern int siw_rqe_complete(struct siw_qp *qp, struct siw_rqe *rqe, u32 bytes,
+ u32 inval_stag, enum siw_wc_status status);
+extern void siw_qp_llp_data_ready(struct sock *sk);
+extern void siw_qp_llp_write_space(struct sock *sk);
+
+/* QP TX path functions */
+extern int siw_run_sq(void *arg);
+extern int siw_qp_sq_process(struct siw_qp *qp);
+extern int siw_sq_start(struct siw_qp *qp);
+extern int siw_activate_tx(struct siw_qp *qp);
+extern void siw_stop_tx_thread(int nr_cpu);
+extern int siw_get_tx_cpu(struct siw_device *sdev);
+extern void siw_put_tx_cpu(int cpu);
+
+/* QP RX path functions */
+extern int siw_proc_send(struct siw_qp *qp, struct siw_iwarp_rx *rctx);
+extern int siw_proc_rreq(struct siw_qp *qp, struct siw_iwarp_rx *rctx);
+extern int siw_proc_rresp(struct siw_qp *qp, struct siw_iwarp_rx *rctx);
+extern int siw_proc_write(struct siw_qp *qp, struct siw_iwarp_rx *rctx);
+extern int siw_proc_terminate(struct siw_qp *qp, struct siw_iwarp_rx *rctx);
+
+extern int siw_tcp_rx_data(read_descriptor_t *rd_desc, struct sk_buff *skb,
+ unsigned int off, size_t len);
+
+static inline int siw_crc_array(struct shash_desc *desc, u8 *start, size_t len)
+{
+ return crypto_shash_update(desc, start, len);
+}
+
+static inline int siw_crc_page(struct shash_desc *desc, struct page *p, int off,
+ int len)
+{
+ return crypto_shash_update(desc, page_address(p) + off, len);
+}
+
+static inline struct siw_ucontext *to_siw_ctx(struct ib_ucontext *base_ctx)
+{
+ return container_of(base_ctx, struct siw_ucontext, base_ucontext);
+}
+
+static inline struct siw_qp *to_siw_qp(struct ib_qp *base_qp)
+{
+ return container_of(base_qp, struct siw_qp, base_qp);
+}
+
+static inline struct siw_cq *to_siw_cq(struct ib_cq *base_cq)
+{
+ return container_of(base_cq, struct siw_cq, base_cq);
+}
+
+static inline struct siw_srq *to_siw_srq(struct ib_srq *base_srq)
+{
+ return container_of(base_srq, struct siw_srq, base_srq);
+}
+
+static inline struct siw_device *to_siw_dev(struct ib_device *base_dev)
+{
+ return container_of(base_dev, struct siw_device, base_dev);
+}
+
+static inline struct siw_mr *to_siw_mr(struct ib_mr *base_mr)
+{
+ return container_of(base_mr, struct siw_mr, base_mr);
+}
+
+static inline struct siw_pd *to_siw_pd(struct ib_pd *base_pd)
+{
+ return container_of(base_pd, struct siw_pd, base_pd);
+}
+
+static inline struct siw_qp *siw_qp_id2obj(struct siw_device *sdev, int id)
+{
+ struct siw_qp *qp = idr_find(&sdev->qp_idr, id);
+
+ if (likely(qp && kref_get_unless_zero(&qp->ref)))
+ return qp;
+
+ return NULL;
+}
+
+static inline void siw_qp_get(struct siw_qp *qp)
+{
+ kref_get(&qp->ref);
+}
+
+static inline void siw_qp_put(struct siw_qp *qp)
+{
+ kref_put(&qp->ref, siw_free_qp);
+}
+
+static inline int siw_sq_empty(struct siw_qp *qp)
+{
+ struct siw_sqe *sqe = &qp->sendq[qp->sq_get % qp->attrs.sq_size];
+
+ return READ_ONCE(sqe->flags) == 0;
+}
+
+static inline struct siw_sqe *sq_get_next(struct siw_qp *qp)
+{
+ struct siw_sqe *sqe = &qp->sendq[qp->sq_get % qp->attrs.sq_size];
+
+ if (READ_ONCE(sqe->flags) & SIW_WQE_VALID)
+ return sqe;
+
+ return NULL;
+}
+
+static inline struct siw_sqe *orq_get_current(struct siw_qp *qp)
+{
+ return &qp->orq[qp->orq_get % qp->attrs.orq_size];
+}
+
+static inline struct siw_sqe *orq_get_tail(struct siw_qp *qp)
+{
+ if (likely(qp->attrs.orq_size))
+ return &qp->orq[qp->orq_put % qp->attrs.orq_size];
+
+ pr_warn("siw: QP[%d]: ORQ has zero length", qp->id);
+ return NULL;
+}
+
+static inline struct siw_sqe *orq_get_free(struct siw_qp *qp)
+{
+ struct siw_sqe *orq_e = orq_get_tail(qp);
+
+ if (orq_e && READ_ONCE(orq_e->flags) == 0)
+ return orq_e;
+
+ return NULL;
+}
+
+static inline int siw_orq_empty(struct siw_qp *qp)
+{
+ return qp->orq[qp->orq_get % qp->attrs.orq_size].flags == 0 ? 1 : 0;
+}
+
+static inline struct siw_sqe *irq_alloc_free(struct siw_qp *qp)
+{
+ struct siw_sqe *irq_e = &qp->irq[qp->irq_put % qp->attrs.irq_size];
+
+ if (READ_ONCE(irq_e->flags) == 0) {
+ qp->irq_put++;
+ return irq_e;
+ }
+ return NULL;
+}
+
+static inline struct siw_mr *siw_mem2mr(struct siw_mem *m)
+{
+ if (!SIW_MEM_IS_MW(m))
+ return container_of(m, struct siw_mr, mem);
+ return m->mr;
+}
+
+/* Varia */
+extern void siw_cq_flush(struct siw_cq *cq);
+extern void siw_sq_flush(struct siw_qp *qp);
+extern void siw_rq_flush(struct siw_qp *qp);
+extern int siw_reap_cqe(struct siw_cq *cq, struct ib_wc *wc);
+extern void siw_print_hdr(union iwarp_hdr *hdr, int qp_id, char *string);
+#endif
--
2.17.2
