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linux/include/rdma/rdmavt_qp.h
Gustavo A. R. Silva 5b361328ca RDMA: Replace zero-length array with flexible-array member 
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by
this change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Link: https://lore.kernel.org/r/20200213010425.GA13068@embeddedor.com
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> # added a few more
2020-02-20 13:33:51 -04:00

1000 lines
29 KiB
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#ifndef DEF_RDMAVT_INCQP_H
#define DEF_RDMAVT_INCQP_H
/*
* Copyright(c) 2016 - 2019 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>
#include <rdma/rdmavt_cq.h>
#include <rdma/rvt-abi.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_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
* RVT_S_MAX_BIT_MASK - The max bit that can be used by rdmavt
*/
#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_TX 0x0800
#define RVT_S_WAIT_DMA_DESC 0x1000
#define RVT_S_WAIT_KMEM 0x2000
#define RVT_S_WAIT_PSN 0x4000
#define RVT_S_WAIT_ACK 0x8000
#define RVT_S_SEND_ONE 0x10000
#define RVT_S_UNLIMITED_CREDIT 0x20000
#define RVT_S_ECN 0x40000
#define RVT_S_MAX_BIT_MASK 0x800000
/*
* Drivers should use s_flags starting with bit 31 down to the bit next to
* RVT_S_MAX_BIT_MASK
*/
/*
* Wait flags that would prevent any packet type from being sent.
*/
#define RVT_S_ANY_WAIT_IO \
(RVT_S_WAIT_PIO | 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)
#define RVT_SEND_OR_FLUSH_OR_RECV_OK \
(RVT_PROCESS_SEND_OK | RVT_FLUSH_SEND | RVT_PROCESS_RECV_OK)
/*
* Internal send flags
*/
#define RVT_SEND_RESERVE_USED IB_SEND_RESERVED_START
#define RVT_SEND_COMPLETION_ONLY (IB_SEND_RESERVED_START << 1)
/**
* rvt_ud_wr - IB UD work plus AH cache
* @wr: valid IB work request
* @attr: pointer to an allocated AH attribute
*
* Special case the UD WR so we can keep track of the AH attributes.
*
* NOTE: This data structure is stricly ordered wr then attr. I.e the attr
* MUST come after wr. The ib_ud_wr is sized and copied in rvt_post_one_wr.
* The copy assumes that wr is first.
*/
struct rvt_ud_wr {
struct ib_ud_wr wr;
struct rdma_ah_attr *attr;
};
/*
* 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 rvt_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 */
void *priv; /* driver dependent field */
struct rvt_sge sg_list[];
};
/**
* struct rvt_krwq - kernel struct receive work request
* @p_lock: lock to protect producer of the kernel buffer
* @head: index of next entry to fill
* @c_lock:lock to protect consumer of the kernel buffer
* @tail: index of next entry to pull
* @count: count is aproximate of total receive enteries posted
* @rvt_rwqe: struct of receive work request queue entry
*
* This structure is used to contain the head pointer,
* tail pointer and receive work queue entries for kernel
* mode user.
*/
struct rvt_krwq {
spinlock_t p_lock; /* protect producer */
u32 head; /* new work requests posted to the head */
/* protect consumer */
spinlock_t c_lock ____cacheline_aligned_in_smp;
u32 tail; /* receives pull requests from here. */
u32 count; /* approx count of receive entries posted */
struct rvt_rwqe *curr_wq;
struct rvt_rwqe wq[];
};
/*
* rvt_get_swqe_ah - Return the pointer to the struct rvt_ah
* @swqe: valid Send WQE
*
*/
static inline struct rvt_ah *rvt_get_swqe_ah(struct rvt_swqe *swqe)
{
return ibah_to_rvtah(swqe->ud_wr.wr.ah);
}
/**
* rvt_get_swqe_ah_attr - Return the cached ah attribute information
* @swqe: valid Send WQE
*
*/
static inline struct rdma_ah_attr *rvt_get_swqe_ah_attr(struct rvt_swqe *swqe)
{
return swqe->ud_wr.attr;
}
/**
* rvt_get_swqe_remote_qpn - Access the remote QPN value
* @swqe: valid Send WQE
*
*/
static inline u32 rvt_get_swqe_remote_qpn(struct rvt_swqe *swqe)
{
return swqe->ud_wr.wr.remote_qpn;
}
/**
* rvt_get_swqe_remote_qkey - Acces the remote qkey value
* @swqe: valid Send WQE
*
*/
static inline u32 rvt_get_swqe_remote_qkey(struct rvt_swqe *swqe)
{
return swqe->ud_wr.wr.remote_qkey;
}
/**
* rvt_get_swqe_pkey_index - Access the pkey index
* @swqe: valid Send WQE
*
*/
static inline u16 rvt_get_swqe_pkey_index(struct rvt_swqe *swqe)
{
return swqe->ud_wr.wr.pkey_index;
}
struct rvt_rq {
struct rvt_rwq *wq;
struct rvt_krwq *kwq;
u32 size; /* size of RWQE array */
u8 max_sge;
/* protect changes in this struct */
spinlock_t lock ____cacheline_aligned_in_smp;
};
/*
* 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;
void *priv;
};
#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_IGN_RNR_CNT 0x00000020
#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 rdma_ah_attr remote_ah_attr;
struct rdma_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 */
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 */
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[] */
u8 r_adefered; /* defered ack count */
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_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) */
u32 s_ahgpsn; /* set to the psn in the copy of the header */
u16 s_cur_size; /* size of send packet in bytes */
u16 s_rdma_ack_cnt;
u8 s_hdrwords; /* size of s_hdr in 32 bit words */
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[] */
u8 s_acked_ack_queue; /* index into s_ack_queue[] */
struct rvt_sge_state s_ack_rdma_sge;
struct timer_list s_timer;
struct hrtimer s_rnr_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;
};
static inline struct rvt_srq *ibsrq_to_rvtsrq(struct ib_srq *ibsrq)
{
return container_of(ibsrq, struct rvt_srq, ibsrq);
}
static inline struct rvt_qp *ibqp_to_rvtqp(struct ib_qp *ibqp)
{
return container_of(ibqp, struct rvt_qp, ibqp);
}
#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 IB_QPN_MASK
/*
* 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_addr {
union ib_gid mgid;
u16 lid;
};
struct rvt_mcast {
struct rb_node rb_node;
struct rvt_mcast_addr mcast_addr;
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->kwq->curr_wq +
(sizeof(struct rvt_rwqe) +
rq->max_sge * sizeof(struct ib_sge)) * n);
}
/**
* rvt_is_user_qp - return if this is user mode QP
* @qp - the target QP
*/
static inline bool rvt_is_user_qp(struct rvt_qp *qp)
{
return !!qp->pid;
}
/**
* rvt_get_qp - get a QP reference
* @qp - the QP to hold
*/
static inline void rvt_get_qp(struct rvt_qp *qp)
{
atomic_inc(&qp->refcount);
}
/**
* rvt_put_qp - release a QP reference
* @qp - the QP to release
*/
static inline void rvt_put_qp(struct rvt_qp *qp)
{
if (qp && atomic_dec_and_test(&qp->refcount))
wake_up(&qp->wait);
}
/**
* rvt_put_swqe - drop mr refs held by swqe
* @wqe - the send wqe
*
* This drops any mr references held by the swqe
*/
static inline void rvt_put_swqe(struct rvt_swqe *wqe)
{
int i;
for (i = 0; i < wqe->wr.num_sge; i++) {
struct rvt_sge *sge = &wqe->sg_list[i];
rvt_put_mr(sge->mr);
}
}
/**
* 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)
{
atomic_inc(&qp->s_reserved_used);
}
/**
* rvt_qp_wqe_unreserve - clean reserved operation
* @qp - the rvt qp
* @flags - send wqe flags
*
* 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, int flags)
{
if (unlikely(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 enum ib_wc_opcode ib_rvt_wc_opcode[];
/*
* Compare the lower 24 bits of the msn values.
* Returns an integer <, ==, or > than zero.
*/
static inline int rvt_cmp_msn(u32 a, u32 b)
{
return (((int)a) - ((int)b)) << 8;
}
__be32 rvt_compute_aeth(struct rvt_qp *qp);
void rvt_get_credit(struct rvt_qp *qp, u32 aeth);
u32 rvt_restart_sge(struct rvt_sge_state *ss, struct rvt_swqe *wqe, u32 len);
/**
* rvt_div_round_up_mtu - round up divide
* @qp - the qp pair
* @len - the length
*
* Perform a shift based mtu round up divide
*/
static inline u32 rvt_div_round_up_mtu(struct rvt_qp *qp, u32 len)
{
return (len + qp->pmtu - 1) >> qp->log_pmtu;
}
/**
* @qp - the qp pair
* @len - the length
*
* Perform a shift based mtu divide
*/
static inline u32 rvt_div_mtu(struct rvt_qp *qp, u32 len)
{
return len >> qp->log_pmtu;
}
/**
* rvt_timeout_to_jiffies - Convert a ULP timeout input into jiffies
* @timeout - timeout input(0 - 31).
*
* Return a timeout value in jiffies.
*/
static inline unsigned long rvt_timeout_to_jiffies(u8 timeout)
{
if (timeout > 31)
timeout = 31;
return usecs_to_jiffies(1U << timeout) * 4096UL / 1000UL;
}
/**
* rvt_lookup_qpn - return the QP with the given QPN
* @ibp: the ibport
* @qpn: the QP number to look up
*
* The caller must hold the rcu_read_lock(), and keep the lock until
* the returned qp is no longer in use.
*/
static inline struct rvt_qp *rvt_lookup_qpn(struct rvt_dev_info *rdi,
struct rvt_ibport *rvp,
u32 qpn) __must_hold(RCU)
{
struct rvt_qp *qp = NULL;
if (unlikely(qpn <= 1)) {
qp = rcu_dereference(rvp->qp[qpn]);
} else {
u32 n = hash_32(qpn, rdi->qp_dev->qp_table_bits);
for (qp = rcu_dereference(rdi->qp_dev->qp_table[n]); qp;
qp = rcu_dereference(qp->next))
if (qp->ibqp.qp_num == qpn)
break;
}
return qp;
}
/**
* rvt_mod_retry_timer - mod a retry timer
* @qp - the QP
* @shift - timeout shift to wait for multiple packets
* Modify a potentially already running retry timer
*/
static inline void rvt_mod_retry_timer_ext(struct rvt_qp *qp, u8 shift)
{
struct ib_qp *ibqp = &qp->ibqp;
struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device);
lockdep_assert_held(&qp->s_lock);
qp->s_flags |= RVT_S_TIMER;
/* 4.096 usec. * (1 << qp->timeout) */
mod_timer(&qp->s_timer, jiffies + rdi->busy_jiffies +
(qp->timeout_jiffies << shift));
}
static inline void rvt_mod_retry_timer(struct rvt_qp *qp)
{
return rvt_mod_retry_timer_ext(qp, 0);
}
/**
* rvt_put_qp_swqe - drop refs held by swqe
* @qp: the send qp
* @wqe: the send wqe
*
* This drops any references held by the swqe
*/
static inline void rvt_put_qp_swqe(struct rvt_qp *qp, struct rvt_swqe *wqe)
{
rvt_put_swqe(wqe);
if (qp->allowed_ops == IB_OPCODE_UD)
rdma_destroy_ah_attr(wqe->ud_wr.attr);
}
/**
* rvt_qp_sqwe_incr - increment ring index
* @qp: the qp
* @val: the starting value
*
* Return: the new value wrapping as appropriate
*/
static inline u32
rvt_qp_swqe_incr(struct rvt_qp *qp, u32 val)
{
if (++val >= qp->s_size)
val = 0;
return val;
}
int rvt_error_qp(struct rvt_qp *qp, enum ib_wc_status err);
/**
* rvt_recv_cq - add a new entry to completion queue
* by receive queue
* @qp: receive queue
* @wc: work completion entry to add
* @solicited: true if @entry is solicited
*
* This is wrapper function for rvt_enter_cq function call by
* receive queue. If rvt_cq_enter return false, it means cq is
* full and the qp is put into error state.
*/
static inline void rvt_recv_cq(struct rvt_qp *qp, struct ib_wc *wc,
bool solicited)
{
struct rvt_cq *cq = ibcq_to_rvtcq(qp->ibqp.recv_cq);
if (unlikely(!rvt_cq_enter(cq, wc, solicited)))
rvt_error_qp(qp, IB_WC_LOC_QP_OP_ERR);
}
/**
* rvt_send_cq - add a new entry to completion queue
* by send queue
* @qp: send queue
* @wc: work completion entry to add
* @solicited: true if @entry is solicited
*
* This is wrapper function for rvt_enter_cq function call by
* send queue. If rvt_cq_enter return false, it means cq is
* full and the qp is put into error state.
*/
static inline void rvt_send_cq(struct rvt_qp *qp, struct ib_wc *wc,
bool solicited)
{
struct rvt_cq *cq = ibcq_to_rvtcq(qp->ibqp.send_cq);
if (unlikely(!rvt_cq_enter(cq, wc, solicited)))
rvt_error_qp(qp, IB_WC_LOC_QP_OP_ERR);
}
/**
* rvt_qp_complete_swqe - insert send completion
* @qp - the qp
* @wqe - the send wqe
* @opcode - wc operation (driver dependent)
* @status - completion status
*
* Update the s_last information, and then insert a send
* completion into the completion
* queue if the qp indicates it should be done.
*
* See IBTA 10.7.3.1 for info on completion
* control.
*
* Return: new last
*/
static inline u32
rvt_qp_complete_swqe(struct rvt_qp *qp,
struct rvt_swqe *wqe,
enum ib_wc_opcode opcode,
enum ib_wc_status status)
{
bool need_completion;
u64 wr_id;
u32 byte_len, last;
int flags = wqe->wr.send_flags;
rvt_qp_wqe_unreserve(qp, flags);
rvt_put_qp_swqe(qp, wqe);
need_completion =
!(flags & RVT_SEND_RESERVE_USED) &&
(!(qp->s_flags & RVT_S_SIGNAL_REQ_WR) ||
(flags & IB_SEND_SIGNALED) ||
status != IB_WC_SUCCESS);
if (need_completion) {
wr_id = wqe->wr.wr_id;
byte_len = wqe->length;
/* above fields required before writing s_last */
}
last = rvt_qp_swqe_incr(qp, qp->s_last);
/* see rvt_qp_is_avail() */
smp_store_release(&qp->s_last, last);
if (need_completion) {
struct ib_wc w = {
.wr_id = wr_id,
.status = status,
.opcode = opcode,
.qp = &qp->ibqp,
.byte_len = byte_len,
};
rvt_send_cq(qp, &w, status != IB_WC_SUCCESS);
}
return last;
}
extern const int ib_rvt_state_ops[];
struct rvt_dev_info;
int rvt_get_rwqe(struct rvt_qp *qp, bool wr_id_only);
void rvt_comm_est(struct rvt_qp *qp);
void rvt_rc_error(struct rvt_qp *qp, enum ib_wc_status err);
unsigned long rvt_rnr_tbl_to_usec(u32 index);
enum hrtimer_restart rvt_rc_rnr_retry(struct hrtimer *t);
void rvt_add_rnr_timer(struct rvt_qp *qp, u32 aeth);
void rvt_del_timers_sync(struct rvt_qp *qp);
void rvt_stop_rc_timers(struct rvt_qp *qp);
void rvt_add_retry_timer_ext(struct rvt_qp *qp, u8 shift);
static inline void rvt_add_retry_timer(struct rvt_qp *qp)
{
rvt_add_retry_timer_ext(qp, 0);
}
void rvt_copy_sge(struct rvt_qp *qp, struct rvt_sge_state *ss,
void *data, u32 length,
bool release, bool copy_last);
void rvt_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe,
enum ib_wc_status status);
void rvt_ruc_loopback(struct rvt_qp *qp);
/**
* struct rvt_qp_iter - the iterator for QPs
* @qp - the current QP
*
* This structure defines the current iterator
* state for sequenced access to all QPs relative
* to an rvt_dev_info.
*/
struct rvt_qp_iter {
struct rvt_qp *qp;
/* private: backpointer */
struct rvt_dev_info *rdi;
/* private: callback routine */
void (*cb)(struct rvt_qp *qp, u64 v);
/* private: for arg to callback routine */
u64 v;
/* private: number of SMI,GSI QPs for device */
int specials;
/* private: current iterator index */
int n;
};
/**
* ib_cq_tail - Return tail index of cq buffer
* @send_cq - The cq for send
*
* This is called in qp_iter_print to get tail
* of cq buffer.
*/
static inline u32 ib_cq_tail(struct ib_cq *send_cq)
{
struct rvt_cq *cq = ibcq_to_rvtcq(send_cq);
return ibcq_to_rvtcq(send_cq)->ip ?
RDMA_READ_UAPI_ATOMIC(cq->queue->tail) :
ibcq_to_rvtcq(send_cq)->kqueue->tail;
}
/**
* ib_cq_head - Return head index of cq buffer
* @send_cq - The cq for send
*
* This is called in qp_iter_print to get head
* of cq buffer.
*/
static inline u32 ib_cq_head(struct ib_cq *send_cq)
{
struct rvt_cq *cq = ibcq_to_rvtcq(send_cq);
return ibcq_to_rvtcq(send_cq)->ip ?
RDMA_READ_UAPI_ATOMIC(cq->queue->head) :
ibcq_to_rvtcq(send_cq)->kqueue->head;
}
/**
* rvt_free_rq - free memory allocated for rvt_rq struct
* @rvt_rq: request queue data structure
*
* This function should only be called if the rvt_mmap_info()
* has not succeeded.
*/
static inline void rvt_free_rq(struct rvt_rq *rq)
{
kvfree(rq->kwq);
rq->kwq = NULL;
vfree(rq->wq);
rq->wq = NULL;
}
/**
* rvt_to_iport - Get the ibport pointer
* @qp: the qp pointer
*
* This function returns the ibport pointer from the qp pointer.
*/
static inline struct rvt_ibport *rvt_to_iport(struct rvt_qp *qp)
{
struct rvt_dev_info *rdi = ib_to_rvt(qp->ibqp.device);
return rdi->ports[qp->port_num - 1];
}
/**
* rvt_rc_credit_avail - Check if there are enough RC credits for the request
* @qp: the qp
* @wqe: the request
*
* This function returns false when there are not enough credits for the given
* request and true otherwise.
*/
static inline bool rvt_rc_credit_avail(struct rvt_qp *qp, struct rvt_swqe *wqe)
{
lockdep_assert_held(&qp->s_lock);
if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) &&
rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) {
struct rvt_ibport *rvp = rvt_to_iport(qp);
qp->s_flags |= RVT_S_WAIT_SSN_CREDIT;
rvp->n_rc_crwaits++;
return false;
}
return true;
}
struct rvt_qp_iter *rvt_qp_iter_init(struct rvt_dev_info *rdi,
u64 v,
void (*cb)(struct rvt_qp *qp, u64 v));
int rvt_qp_iter_next(struct rvt_qp_iter *iter);
void rvt_qp_iter(struct rvt_dev_info *rdi,
u64 v,
void (*cb)(struct rvt_qp *qp, u64 v));
void rvt_qp_mr_clean(struct rvt_qp *qp, u32 lkey);
#endif /* DEF_RDMAVT_INCQP_H */
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