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linux/include/rdma/rdmavt_qp.h
Ira Weiny fe508272c9 IB/rdmavt: Eliminate redundant opcode test in mr ref clear 
The use of the specific opcode test is redundant since
all ack entry users correctly manipulate the mr pointer
to selectively trigger the reference clearing.

The overly specific test hinders the use of implementation
specific operations.

The change needs to get rid of the union to insure that
an atomic value is not seen as an MR pointer.

Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
2016-08-02 22:46:21 -04:00

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#ifndef DEF_RDMAVT_INCQP_H
#define DEF_RDMAVT_INCQP_H
/*
* Copyright(c) 2016 Intel Corporation.
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* BSD LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* - Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <rdma/rdma_vt.h>
#include <rdma/ib_pack.h>
#include <rdma/ib_verbs.h>
/*
* Atomic bit definitions for r_aflags.
*/
#define RVT_R_WRID_VALID 0
#define RVT_R_REWIND_SGE 1
/*
* Bit definitions for r_flags.
*/
#define RVT_R_REUSE_SGE 0x01
#define RVT_R_RDMAR_SEQ 0x02
#define RVT_R_RSP_NAK 0x04
#define RVT_R_RSP_SEND 0x08
#define RVT_R_COMM_EST 0x10
/*
* Bit definitions for s_flags.
*
* RVT_S_SIGNAL_REQ_WR - set if QP send WRs contain completion signaled
* RVT_S_BUSY - send tasklet is processing the QP
* RVT_S_TIMER - the RC retry timer is active
* RVT_S_ACK_PENDING - an ACK is waiting to be sent after RDMA read/atomics
* RVT_S_WAIT_FENCE - waiting for all prior RDMA read or atomic SWQEs
* before processing the next SWQE
* RVT_S_WAIT_RDMAR - waiting for a RDMA read or atomic SWQE to complete
* before processing the next SWQE
* RVT_S_WAIT_RNR - waiting for RNR timeout
* RVT_S_WAIT_SSN_CREDIT - waiting for RC credits to process next SWQE
* RVT_S_WAIT_DMA - waiting for send DMA queue to drain before generating
* next send completion entry not via send DMA
* RVT_S_WAIT_PIO - waiting for a send buffer to be available
* RVT_S_WAIT_PIO_DRAIN - waiting for a qp to drain pio packets
* RVT_S_WAIT_TX - waiting for a struct verbs_txreq to be available
* RVT_S_WAIT_DMA_DESC - waiting for DMA descriptors to be available
* RVT_S_WAIT_KMEM - waiting for kernel memory to be available
* RVT_S_WAIT_PSN - waiting for a packet to exit the send DMA queue
* RVT_S_WAIT_ACK - waiting for an ACK packet before sending more requests
* RVT_S_SEND_ONE - send one packet, request ACK, then wait for ACK
* RVT_S_ECN - a BECN was queued to the send engine
*/
#define RVT_S_SIGNAL_REQ_WR 0x0001
#define RVT_S_BUSY 0x0002
#define RVT_S_TIMER 0x0004
#define RVT_S_RESP_PENDING 0x0008
#define RVT_S_ACK_PENDING 0x0010
#define RVT_S_WAIT_FENCE 0x0020
#define RVT_S_WAIT_RDMAR 0x0040
#define RVT_S_WAIT_RNR 0x0080
#define RVT_S_WAIT_SSN_CREDIT 0x0100
#define RVT_S_WAIT_DMA 0x0200
#define RVT_S_WAIT_PIO 0x0400
#define RVT_S_WAIT_PIO_DRAIN 0x0800
#define RVT_S_WAIT_TX 0x1000
#define RVT_S_WAIT_DMA_DESC 0x2000
#define RVT_S_WAIT_KMEM 0x4000
#define RVT_S_WAIT_PSN 0x8000
#define RVT_S_WAIT_ACK 0x10000
#define RVT_S_SEND_ONE 0x20000
#define RVT_S_UNLIMITED_CREDIT 0x40000
#define RVT_S_AHG_VALID 0x80000
#define RVT_S_AHG_CLEAR 0x100000
#define RVT_S_ECN 0x200000
/*
* Wait flags that would prevent any packet type from being sent.
*/
#define RVT_S_ANY_WAIT_IO \
(RVT_S_WAIT_PIO | RVT_S_WAIT_PIO_DRAIN | RVT_S_WAIT_TX | \
RVT_S_WAIT_DMA_DESC | RVT_S_WAIT_KMEM)
/*
* Wait flags that would prevent send work requests from making progress.
*/
#define RVT_S_ANY_WAIT_SEND (RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR | \
RVT_S_WAIT_RNR | RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_DMA | \
RVT_S_WAIT_PSN | RVT_S_WAIT_ACK)
#define RVT_S_ANY_WAIT (RVT_S_ANY_WAIT_IO | RVT_S_ANY_WAIT_SEND)
/* Number of bits to pay attention to in the opcode for checking qp type */
#define RVT_OPCODE_QP_MASK 0xE0
/* Flags for checking QP state (see ib_rvt_state_ops[]) */
#define RVT_POST_SEND_OK 0x01
#define RVT_POST_RECV_OK 0x02
#define RVT_PROCESS_RECV_OK 0x04
#define RVT_PROCESS_SEND_OK 0x08
#define RVT_PROCESS_NEXT_SEND_OK 0x10
#define RVT_FLUSH_SEND 0x20
#define RVT_FLUSH_RECV 0x40
#define RVT_PROCESS_OR_FLUSH_SEND \
(RVT_PROCESS_SEND_OK | RVT_FLUSH_SEND)
/*
* Internal send flags
*/
#define RVT_SEND_RESERVE_USED IB_SEND_RESERVED_START
#define RVT_SEND_COMPLETION_ONLY (IB_SEND_RESERVED_START << 1)
/*
* Send work request queue entry.
* The size of the sg_list is determined when the QP is created and stored
* in qp->s_max_sge.
*/
struct rvt_swqe {
union {
struct ib_send_wr wr; /* don't use wr.sg_list */
struct ib_ud_wr ud_wr;
struct ib_reg_wr reg_wr;
struct ib_rdma_wr rdma_wr;
struct ib_atomic_wr atomic_wr;
};
u32 psn; /* first packet sequence number */
u32 lpsn; /* last packet sequence number */
u32 ssn; /* send sequence number */
u32 length; /* total length of data in sg_list */
struct rvt_sge sg_list[0];
};
/*
* Receive work request queue entry.
* The size of the sg_list is determined when the QP (or SRQ) is created
* and stored in qp->r_rq.max_sge (or srq->rq.max_sge).
*/
struct rvt_rwqe {
u64 wr_id;
u8 num_sge;
struct ib_sge sg_list[0];
};
/*
* This structure is used to contain the head pointer, tail pointer,
* and receive work queue entries as a single memory allocation so
* it can be mmap'ed into user space.
* Note that the wq array elements are variable size so you can't
* just index into the array to get the N'th element;
* use get_rwqe_ptr() instead.
*/
struct rvt_rwq {
u32 head; /* new work requests posted to the head */
u32 tail; /* receives pull requests from here. */
struct rvt_rwqe wq[0];
};
struct rvt_rq {
struct rvt_rwq *wq;
u32 size; /* size of RWQE array */
u8 max_sge;
/* protect changes in this struct */
spinlock_t lock ____cacheline_aligned_in_smp;
};
/*
* This structure is used by rvt_mmap() to validate an offset
* when an mmap() request is made. The vm_area_struct then uses
* this as its vm_private_data.
*/
struct rvt_mmap_info {
struct list_head pending_mmaps;
struct ib_ucontext *context;
void *obj;
__u64 offset;
struct kref ref;
unsigned size;
};
/*
* This structure holds the information that the send tasklet needs
* to send a RDMA read response or atomic operation.
*/
struct rvt_ack_entry {
struct rvt_sge rdma_sge;
u64 atomic_data;
u32 psn;
u32 lpsn;
u8 opcode;
u8 sent;
};
#define RC_QP_SCALING_INTERVAL 5
#define RVT_OPERATION_PRIV 0x00000001
#define RVT_OPERATION_ATOMIC 0x00000002
#define RVT_OPERATION_ATOMIC_SGE 0x00000004
#define RVT_OPERATION_LOCAL 0x00000008
#define RVT_OPERATION_USE_RESERVE 0x00000010
#define RVT_OPERATION_MAX (IB_WR_RESERVED10 + 1)
/**
* rvt_operation_params - op table entry
* @length - the length to copy into the swqe entry
* @qpt_support - a bit mask indicating QP type support
* @flags - RVT_OPERATION flags (see above)
*
* This supports table driven post send so that
* the driver can have differing an potentially
* different sets of operations.
*
**/
struct rvt_operation_params {
size_t length;
u32 qpt_support;
u32 flags;
};
/*
* Common variables are protected by both r_rq.lock and s_lock in that order
* which only happens in modify_qp() or changing the QP 'state'.
*/
struct rvt_qp {
struct ib_qp ibqp;
void *priv; /* Driver private data */
/* read mostly fields above and below */
struct ib_ah_attr remote_ah_attr;
struct ib_ah_attr alt_ah_attr;
struct rvt_qp __rcu *next; /* link list for QPN hash table */
struct rvt_swqe *s_wq; /* send work queue */
struct rvt_mmap_info *ip;
unsigned long timeout_jiffies; /* computed from timeout */
enum ib_mtu path_mtu;
int srate_mbps; /* s_srate (below) converted to Mbit/s */
pid_t pid; /* pid for user mode QPs */
u32 remote_qpn;
u32 qkey; /* QKEY for this QP (for UD or RD) */
u32 s_size; /* send work queue size */
u32 s_ahgpsn; /* set to the psn in the copy of the header */
u16 pmtu; /* decoded from path_mtu */
u8 log_pmtu; /* shift for pmtu */
u8 state; /* QP state */
u8 allowed_ops; /* high order bits of allowed opcodes */
u8 qp_access_flags;
u8 alt_timeout; /* Alternate path timeout for this QP */
u8 timeout; /* Timeout for this QP */
u8 s_srate;
u8 s_mig_state;
u8 port_num;
u8 s_pkey_index; /* PKEY index to use */
u8 s_alt_pkey_index; /* Alternate path PKEY index to use */
u8 r_max_rd_atomic; /* max number of RDMA read/atomic to receive */
u8 s_max_rd_atomic; /* max number of RDMA read/atomic to send */
u8 s_retry_cnt; /* number of times to retry */
u8 s_rnr_retry_cnt;
u8 r_min_rnr_timer; /* retry timeout value for RNR NAKs */
u8 s_max_sge; /* size of s_wq->sg_list */
u8 s_draining;
/* start of read/write fields */
atomic_t refcount ____cacheline_aligned_in_smp;
wait_queue_head_t wait;
struct rvt_ack_entry *s_ack_queue;
struct rvt_sge_state s_rdma_read_sge;
spinlock_t r_lock ____cacheline_aligned_in_smp; /* used for APM */
u32 r_psn; /* expected rcv packet sequence number */
unsigned long r_aflags;
u64 r_wr_id; /* ID for current receive WQE */
u32 r_ack_psn; /* PSN for next ACK or atomic ACK */
u32 r_len; /* total length of r_sge */
u32 r_rcv_len; /* receive data len processed */
u32 r_msn; /* message sequence number */
u8 r_state; /* opcode of last packet received */
u8 r_flags;
u8 r_head_ack_queue; /* index into s_ack_queue[] */
struct list_head rspwait; /* link for waiting to respond */
struct rvt_sge_state r_sge; /* current receive data */
struct rvt_rq r_rq; /* receive work queue */
/* post send line */
spinlock_t s_hlock ____cacheline_aligned_in_smp;
u32 s_head; /* new entries added here */
u32 s_next_psn; /* PSN for next request */
u32 s_avail; /* number of entries avail */
u32 s_ssn; /* SSN of tail entry */
atomic_t s_reserved_used; /* reserved entries in use */
spinlock_t s_lock ____cacheline_aligned_in_smp;
u32 s_flags;
struct rvt_sge_state *s_cur_sge;
struct rvt_swqe *s_wqe;
struct rvt_sge_state s_sge; /* current send request data */
struct rvt_mregion *s_rdma_mr;
u32 s_cur_size; /* size of send packet in bytes */
u32 s_len; /* total length of s_sge */
u32 s_rdma_read_len; /* total length of s_rdma_read_sge */
u32 s_last_psn; /* last response PSN processed */
u32 s_sending_psn; /* lowest PSN that is being sent */
u32 s_sending_hpsn; /* highest PSN that is being sent */
u32 s_psn; /* current packet sequence number */
u32 s_ack_rdma_psn; /* PSN for sending RDMA read responses */
u32 s_ack_psn; /* PSN for acking sends and RDMA writes */
u32 s_tail; /* next entry to process */
u32 s_cur; /* current work queue entry */
u32 s_acked; /* last un-ACK'ed entry */
u32 s_last; /* last completed entry */
u32 s_lsn; /* limit sequence number (credit) */
u16 s_hdrwords; /* size of s_hdr in 32 bit words */
u16 s_rdma_ack_cnt;
s8 s_ahgidx;
u8 s_state; /* opcode of last packet sent */
u8 s_ack_state; /* opcode of packet to ACK */
u8 s_nak_state; /* non-zero if NAK is pending */
u8 r_nak_state; /* non-zero if NAK is pending */
u8 s_retry; /* requester retry counter */
u8 s_rnr_retry; /* requester RNR retry counter */
u8 s_num_rd_atomic; /* number of RDMA read/atomic pending */
u8 s_tail_ack_queue; /* index into s_ack_queue[] */
struct rvt_sge_state s_ack_rdma_sge;
struct timer_list s_timer;
atomic_t local_ops_pending; /* number of fast_reg/local_inv reqs */
/*
* This sge list MUST be last. Do not add anything below here.
*/
struct rvt_sge r_sg_list[0] /* verified SGEs */
____cacheline_aligned_in_smp;
};
struct rvt_srq {
struct ib_srq ibsrq;
struct rvt_rq rq;
struct rvt_mmap_info *ip;
/* send signal when number of RWQEs < limit */
u32 limit;
};
#define RVT_QPN_MAX BIT(24)
#define RVT_QPNMAP_ENTRIES (RVT_QPN_MAX / PAGE_SIZE / BITS_PER_BYTE)
#define RVT_BITS_PER_PAGE (PAGE_SIZE * BITS_PER_BYTE)
#define RVT_BITS_PER_PAGE_MASK (RVT_BITS_PER_PAGE - 1)
#define RVT_QPN_MASK 0xFFFFFF
/*
* QPN-map pages start out as NULL, they get allocated upon
* first use and are never deallocated. This way,
* large bitmaps are not allocated unless large numbers of QPs are used.
*/
struct rvt_qpn_map {
void *page;
};
struct rvt_qpn_table {
spinlock_t lock; /* protect changes to the qp table */
unsigned flags; /* flags for QP0/1 allocated for each port */
u32 last; /* last QP number allocated */
u32 nmaps; /* size of the map table */
u16 limit;
u8 incr;
/* bit map of free QP numbers other than 0/1 */
struct rvt_qpn_map map[RVT_QPNMAP_ENTRIES];
};
struct rvt_qp_ibdev {
u32 qp_table_size;
u32 qp_table_bits;
struct rvt_qp __rcu **qp_table;
spinlock_t qpt_lock; /* qptable lock */
struct rvt_qpn_table qpn_table;
};
/*
* There is one struct rvt_mcast for each multicast GID.
* All attached QPs are then stored as a list of
* struct rvt_mcast_qp.
*/
struct rvt_mcast_qp {
struct list_head list;
struct rvt_qp *qp;
};
struct rvt_mcast {
struct rb_node rb_node;
union ib_gid mgid;
struct list_head qp_list;
wait_queue_head_t wait;
atomic_t refcount;
int n_attached;
};
/*
* Since struct rvt_swqe is not a fixed size, we can't simply index into
* struct rvt_qp.s_wq. This function does the array index computation.
*/
static inline struct rvt_swqe *rvt_get_swqe_ptr(struct rvt_qp *qp,
unsigned n)
{
return (struct rvt_swqe *)((char *)qp->s_wq +
(sizeof(struct rvt_swqe) +
qp->s_max_sge *
sizeof(struct rvt_sge)) * n);
}
/*
* Since struct rvt_rwqe is not a fixed size, we can't simply index into
* struct rvt_rwq.wq. This function does the array index computation.
*/
static inline struct rvt_rwqe *rvt_get_rwqe_ptr(struct rvt_rq *rq, unsigned n)
{
return (struct rvt_rwqe *)
((char *)rq->wq->wq +
(sizeof(struct rvt_rwqe) +
rq->max_sge * sizeof(struct ib_sge)) * n);
}
/**
* rvt_qp_wqe_reserve - reserve operation
* @qp - the rvt qp
* @wqe - the send wqe
*
* This routine used in post send to record
* a wqe relative reserved operation use.
*/
static inline void rvt_qp_wqe_reserve(
struct rvt_qp *qp,
struct rvt_swqe *wqe)
{
wqe->wr.send_flags |= RVT_SEND_RESERVE_USED;
atomic_inc(&qp->s_reserved_used);
}
/**
* rvt_qp_wqe_unreserve - clean reserved operation
* @qp - the rvt qp
* @wqe - the send wqe
*
* This decrements the reserve use count.
*
* This call MUST precede the change to
* s_last to insure that post send sees a stable
* s_avail.
*
* An smp_mp__after_atomic() is used to insure
* the compiler does not juggle the order of the s_last
* ring index and the decrementing of s_reserved_used.
*/
static inline void rvt_qp_wqe_unreserve(
struct rvt_qp *qp,
struct rvt_swqe *wqe)
{
if (unlikely(wqe->wr.send_flags & RVT_SEND_RESERVE_USED)) {
wqe->wr.send_flags &= ~RVT_SEND_RESERVE_USED;
atomic_dec(&qp->s_reserved_used);
/* insure no compiler re-order up to s_last change */
smp_mb__after_atomic();
}
}
extern const int ib_rvt_state_ops[];
struct rvt_dev_info;
int rvt_error_qp(struct rvt_qp *qp, enum ib_wc_status err);
#endif /* DEF_RDMAVT_INCQP_H */
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