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linux/drivers/infiniband/hw/cxgb4/t4.h

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/*
* Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef __T4_H__
#define __T4_H__
#include "t4_hw.h"
#include "t4_regs.h"
#include "t4_values.h"
#include "t4_msg.h"
#include "t4fw_ri_api.h"
#define T4_MAX_NUM_PD 65536
#define T4_MAX_MR_SIZE (~0ULL)
#define T4_PAGESIZE_MASK 0xffff000 /* 4KB-128MB */
#define T4_STAG_UNSET 0xffffffff
#define T4_FW_MAJ 0
#define PCIE_MA_SYNC_A 0x30b4
struct t4_status_page {
__be32 rsvd1; /* flit 0 - hw owns */
__be16 rsvd2;
__be16 qid;
__be16 cidx;
__be16 pidx;
u8 qp_err; /* flit 1 - sw owns */
u8 db_off;
u8 pad;
u16 host_wq_pidx;
u16 host_cidx;
u16 host_pidx;
};
#define T4_EQ_ENTRY_SIZE 64
#define T4_SQ_NUM_SLOTS 5
#define T4_SQ_NUM_BYTES (T4_EQ_ENTRY_SIZE * T4_SQ_NUM_SLOTS)
#define T4_MAX_SEND_SGE ((T4_SQ_NUM_BYTES - sizeof(struct fw_ri_send_wr) - \
sizeof(struct fw_ri_isgl)) / sizeof(struct fw_ri_sge))
#define T4_MAX_SEND_INLINE ((T4_SQ_NUM_BYTES - sizeof(struct fw_ri_send_wr) - \
sizeof(struct fw_ri_immd)))
#define T4_MAX_WRITE_INLINE ((T4_SQ_NUM_BYTES - \
sizeof(struct fw_ri_rdma_write_wr) - \
sizeof(struct fw_ri_immd)))
#define T4_MAX_WRITE_SGE ((T4_SQ_NUM_BYTES - \
sizeof(struct fw_ri_rdma_write_wr) - \
sizeof(struct fw_ri_isgl)) / sizeof(struct fw_ri_sge))
#define T4_MAX_FR_IMMD ((T4_SQ_NUM_BYTES - sizeof(struct fw_ri_fr_nsmr_wr) - \
sizeof(struct fw_ri_immd)) & ~31UL)
#define T4_MAX_FR_IMMD_DEPTH (T4_MAX_FR_IMMD / sizeof(u64))
#define T4_MAX_FR_DSGL 1024
#define T4_MAX_FR_DSGL_DEPTH (T4_MAX_FR_DSGL / sizeof(u64))
static inline int t4_max_fr_depth(int use_dsgl)
{
return use_dsgl ? T4_MAX_FR_DSGL_DEPTH : T4_MAX_FR_IMMD_DEPTH;
}
#define T4_RQ_NUM_SLOTS 2
#define T4_RQ_NUM_BYTES (T4_EQ_ENTRY_SIZE * T4_RQ_NUM_SLOTS)
#define T4_MAX_RECV_SGE 4
union t4_wr {
struct fw_ri_res_wr res;
struct fw_ri_wr ri;
struct fw_ri_rdma_write_wr write;
struct fw_ri_send_wr send;
struct fw_ri_rdma_read_wr read;
struct fw_ri_bind_mw_wr bind;
struct fw_ri_fr_nsmr_wr fr;
struct fw_ri_inv_lstag_wr inv;
struct t4_status_page status;
__be64 flits[T4_EQ_ENTRY_SIZE / sizeof(__be64) * T4_SQ_NUM_SLOTS];
};
union t4_recv_wr {
struct fw_ri_recv_wr recv;
struct t4_status_page status;
__be64 flits[T4_EQ_ENTRY_SIZE / sizeof(__be64) * T4_RQ_NUM_SLOTS];
};
static inline void init_wr_hdr(union t4_wr *wqe, u16 wrid,
enum fw_wr_opcodes opcode, u8 flags, u8 len16)
{
wqe->send.opcode = (u8)opcode;
wqe->send.flags = flags;
wqe->send.wrid = wrid;
wqe->send.r1[0] = 0;
wqe->send.r1[1] = 0;
wqe->send.r1[2] = 0;
wqe->send.len16 = len16;
}
/* CQE/AE status codes */
#define T4_ERR_SUCCESS 0x0
#define T4_ERR_STAG 0x1 /* STAG invalid: either the */
/* STAG is offlimt, being 0, */
/* or STAG_key mismatch */
#define T4_ERR_PDID 0x2 /* PDID mismatch */
#define T4_ERR_QPID 0x3 /* QPID mismatch */
#define T4_ERR_ACCESS 0x4 /* Invalid access right */
#define T4_ERR_WRAP 0x5 /* Wrap error */
#define T4_ERR_BOUND 0x6 /* base and bounds voilation */
#define T4_ERR_INVALIDATE_SHARED_MR 0x7 /* attempt to invalidate a */
/* shared memory region */
#define T4_ERR_INVALIDATE_MR_WITH_MW_BOUND 0x8 /* attempt to invalidate a */
/* shared memory region */
#define T4_ERR_ECC 0x9 /* ECC error detected */
#define T4_ERR_ECC_PSTAG 0xA /* ECC error detected when */
/* reading PSTAG for a MW */
/* Invalidate */
#define T4_ERR_PBL_ADDR_BOUND 0xB /* pbl addr out of bounds: */
/* software error */
#define T4_ERR_SWFLUSH 0xC /* SW FLUSHED */
#define T4_ERR_CRC 0x10 /* CRC error */
#define T4_ERR_MARKER 0x11 /* Marker error */
#define T4_ERR_PDU_LEN_ERR 0x12 /* invalid PDU length */
#define T4_ERR_OUT_OF_RQE 0x13 /* out of RQE */
#define T4_ERR_DDP_VERSION 0x14 /* wrong DDP version */
#define T4_ERR_RDMA_VERSION 0x15 /* wrong RDMA version */
#define T4_ERR_OPCODE 0x16 /* invalid rdma opcode */
#define T4_ERR_DDP_QUEUE_NUM 0x17 /* invalid ddp queue number */
#define T4_ERR_MSN 0x18 /* MSN error */
#define T4_ERR_TBIT 0x19 /* tag bit not set correctly */
#define T4_ERR_MO 0x1A /* MO not 0 for TERMINATE */
/* or READ_REQ */
#define T4_ERR_MSN_GAP 0x1B
#define T4_ERR_MSN_RANGE 0x1C
#define T4_ERR_IRD_OVERFLOW 0x1D
#define T4_ERR_RQE_ADDR_BOUND 0x1E /* RQE addr out of bounds: */
/* software error */
#define T4_ERR_INTERNAL_ERR 0x1F /* internal error (opcode */
/* mismatch) */
/*
* CQE defs
*/
struct t4_cqe {
__be32 header;
__be32 len;
union {
struct {
__be32 stag;
__be32 msn;
} rcqe;
struct {
u32 nada1;
u16 nada2;
u16 cidx;
} scqe;
struct {
__be32 wrid_hi;
__be32 wrid_low;
} gen;
} u;
__be64 reserved;
__be64 bits_type_ts;
};
/* macros for flit 0 of the cqe */
#define CQE_QPID_S 12
#define CQE_QPID_M 0xFFFFF
#define CQE_QPID_G(x) ((((x) >> CQE_QPID_S)) & CQE_QPID_M)
#define CQE_QPID_V(x) ((x)<<CQE_QPID_S)
#define CQE_SWCQE_S 11
#define CQE_SWCQE_M 0x1
#define CQE_SWCQE_G(x) ((((x) >> CQE_SWCQE_S)) & CQE_SWCQE_M)
#define CQE_SWCQE_V(x) ((x)<<CQE_SWCQE_S)
#define CQE_STATUS_S 5
#define CQE_STATUS_M 0x1F
#define CQE_STATUS_G(x) ((((x) >> CQE_STATUS_S)) & CQE_STATUS_M)
#define CQE_STATUS_V(x) ((x)<<CQE_STATUS_S)
#define CQE_TYPE_S 4
#define CQE_TYPE_M 0x1
#define CQE_TYPE_G(x) ((((x) >> CQE_TYPE_S)) & CQE_TYPE_M)
#define CQE_TYPE_V(x) ((x)<<CQE_TYPE_S)
#define CQE_OPCODE_S 0
#define CQE_OPCODE_M 0xF
#define CQE_OPCODE_G(x) ((((x) >> CQE_OPCODE_S)) & CQE_OPCODE_M)
#define CQE_OPCODE_V(x) ((x)<<CQE_OPCODE_S)
#define SW_CQE(x) (CQE_SWCQE_G(be32_to_cpu((x)->header)))
#define CQE_QPID(x) (CQE_QPID_G(be32_to_cpu((x)->header)))
#define CQE_TYPE(x) (CQE_TYPE_G(be32_to_cpu((x)->header)))
#define SQ_TYPE(x) (CQE_TYPE((x)))
#define RQ_TYPE(x) (!CQE_TYPE((x)))
#define CQE_STATUS(x) (CQE_STATUS_G(be32_to_cpu((x)->header)))
#define CQE_OPCODE(x) (CQE_OPCODE_G(be32_to_cpu((x)->header)))
#define CQE_SEND_OPCODE(x)( \
(CQE_OPCODE_G(be32_to_cpu((x)->header)) == FW_RI_SEND) || \
(CQE_OPCODE_G(be32_to_cpu((x)->header)) == FW_RI_SEND_WITH_SE) || \
(CQE_OPCODE_G(be32_to_cpu((x)->header)) == FW_RI_SEND_WITH_INV) || \
(CQE_OPCODE_G(be32_to_cpu((x)->header)) == FW_RI_SEND_WITH_SE_INV))
#define CQE_LEN(x) (be32_to_cpu((x)->len))
/* used for RQ completion processing */
#define CQE_WRID_STAG(x) (be32_to_cpu((x)->u.rcqe.stag))
#define CQE_WRID_MSN(x) (be32_to_cpu((x)->u.rcqe.msn))
/* used for SQ completion processing */
#define CQE_WRID_SQ_IDX(x) ((x)->u.scqe.cidx)
/* generic accessor macros */
#define CQE_WRID_HI(x) (be32_to_cpu((x)->u.gen.wrid_hi))
#define CQE_WRID_LOW(x) (be32_to_cpu((x)->u.gen.wrid_low))
/* macros for flit 3 of the cqe */
#define CQE_GENBIT_S 63
#define CQE_GENBIT_M 0x1
#define CQE_GENBIT_G(x) (((x) >> CQE_GENBIT_S) & CQE_GENBIT_M)
#define CQE_GENBIT_V(x) ((x)<<CQE_GENBIT_S)
#define CQE_OVFBIT_S 62
#define CQE_OVFBIT_M 0x1
#define CQE_OVFBIT_G(x) ((((x) >> CQE_OVFBIT_S)) & CQE_OVFBIT_M)
#define CQE_IQTYPE_S 60
#define CQE_IQTYPE_M 0x3
#define CQE_IQTYPE_G(x) ((((x) >> CQE_IQTYPE_S)) & CQE_IQTYPE_M)
#define CQE_TS_M 0x0fffffffffffffffULL
#define CQE_TS_G(x) ((x) & CQE_TS_M)
#define CQE_OVFBIT(x) ((unsigned)CQE_OVFBIT_G(be64_to_cpu((x)->bits_type_ts)))
#define CQE_GENBIT(x) ((unsigned)CQE_GENBIT_G(be64_to_cpu((x)->bits_type_ts)))
#define CQE_TS(x) (CQE_TS_G(be64_to_cpu((x)->bits_type_ts)))
struct t4_swsqe {
u64 wr_id;
struct t4_cqe cqe;
int read_len;
int opcode;
int complete;
int signaled;
u16 idx;
int flushed;
struct timespec host_ts;
u64 sge_ts;
};
static inline pgprot_t t4_pgprot_wc(pgprot_t prot)
{
#if defined(__i386__) || defined(__x86_64__) || defined(CONFIG_PPC64)
return pgprot_writecombine(prot);
#else
return pgprot_noncached(prot);
#endif
}
enum {
T4_SQ_ONCHIP = (1<<0),
};
struct t4_sq {
union t4_wr *queue;
dma_addr_t dma_addr;
DEFINE_DMA_UNMAP_ADDR(mapping);
unsigned long phys_addr;
struct t4_swsqe *sw_sq;
struct t4_swsqe *oldest_read;
void __iomem *bar2_va;
u64 bar2_pa;
size_t memsize;
u32 bar2_qid;
u32 qid;
u16 in_use;
u16 size;
u16 cidx;
u16 pidx;
u16 wq_pidx;
u16 wq_pidx_inc;
u16 flags;
short flush_cidx;
};
struct t4_swrqe {
u64 wr_id;
struct timespec host_ts;
u64 sge_ts;
};
struct t4_rq {
union t4_recv_wr *queue;
dma_addr_t dma_addr;
DEFINE_DMA_UNMAP_ADDR(mapping);
struct t4_swrqe *sw_rq;
void __iomem *bar2_va;
u64 bar2_pa;
size_t memsize;
u32 bar2_qid;
u32 qid;
u32 msn;
u32 rqt_hwaddr;
u16 rqt_size;
u16 in_use;
u16 size;
u16 cidx;
u16 pidx;
u16 wq_pidx;
u16 wq_pidx_inc;
};
struct t4_wq {
struct t4_sq sq;
struct t4_rq rq;
void __iomem *db;
struct c4iw_rdev *rdev;
int flushed;
};
static inline int t4_rqes_posted(struct t4_wq *wq)
{
return wq->rq.in_use;
}
static inline int t4_rq_empty(struct t4_wq *wq)
{
return wq->rq.in_use == 0;
}
static inline int t4_rq_full(struct t4_wq *wq)
{
return wq->rq.in_use == (wq->rq.size - 1);
}
static inline u32 t4_rq_avail(struct t4_wq *wq)
{
return wq->rq.size - 1 - wq->rq.in_use;
}
static inline void t4_rq_produce(struct t4_wq *wq, u8 len16)
{
wq->rq.in_use++;
if (++wq->rq.pidx == wq->rq.size)
wq->rq.pidx = 0;
wq->rq.wq_pidx += DIV_ROUND_UP(len16*16, T4_EQ_ENTRY_SIZE);
if (wq->rq.wq_pidx >= wq->rq.size * T4_RQ_NUM_SLOTS)
wq->rq.wq_pidx %= wq->rq.size * T4_RQ_NUM_SLOTS;
}
static inline void t4_rq_consume(struct t4_wq *wq)
{
wq->rq.in_use--;
wq->rq.msn++;
if (++wq->rq.cidx == wq->rq.size)
wq->rq.cidx = 0;
}
static inline u16 t4_rq_host_wq_pidx(struct t4_wq *wq)
{
return wq->rq.queue[wq->rq.size].status.host_wq_pidx;
}
static inline u16 t4_rq_wq_size(struct t4_wq *wq)
{
return wq->rq.size * T4_RQ_NUM_SLOTS;
}
static inline int t4_sq_onchip(struct t4_sq *sq)
{
return sq->flags & T4_SQ_ONCHIP;
}
static inline int t4_sq_empty(struct t4_wq *wq)
{
return wq->sq.in_use == 0;
}
static inline int t4_sq_full(struct t4_wq *wq)
{
return wq->sq.in_use == (wq->sq.size - 1);
}
static inline u32 t4_sq_avail(struct t4_wq *wq)
{
return wq->sq.size - 1 - wq->sq.in_use;
}
static inline void t4_sq_produce(struct t4_wq *wq, u8 len16)
{
wq->sq.in_use++;
if (++wq->sq.pidx == wq->sq.size)
wq->sq.pidx = 0;
wq->sq.wq_pidx += DIV_ROUND_UP(len16*16, T4_EQ_ENTRY_SIZE);
if (wq->sq.wq_pidx >= wq->sq.size * T4_SQ_NUM_SLOTS)
wq->sq.wq_pidx %= wq->sq.size * T4_SQ_NUM_SLOTS;
}
static inline void t4_sq_consume(struct t4_wq *wq)
{
BUG_ON(wq->sq.in_use < 1);
if (wq->sq.cidx == wq->sq.flush_cidx)
wq->sq.flush_cidx = -1;
wq->sq.in_use--;
if (++wq->sq.cidx == wq->sq.size)
wq->sq.cidx = 0;
}
static inline u16 t4_sq_host_wq_pidx(struct t4_wq *wq)
{
return wq->sq.queue[wq->sq.size].status.host_wq_pidx;
}
static inline u16 t4_sq_wq_size(struct t4_wq *wq)
{
return wq->sq.size * T4_SQ_NUM_SLOTS;
}
/* This function copies 64 byte coalesced work request to memory
* mapped BAR2 space. For coalesced WRs, the SGE fetches data
* from the FIFO instead of from Host.
*/
static inline void pio_copy(u64 __iomem *dst, u64 *src)
{
int count = 8;
while (count) {
writeq(*src, dst);
src++;
dst++;
count--;
}
}
static inline void t4_ring_sq_db(struct t4_wq *wq, u16 inc, union t4_wr *wqe)
{
/* Flush host queue memory writes. */
wmb();
if (wq->sq.bar2_va) {
if (inc == 1 && wq->sq.bar2_qid == 0 && wqe) {
PDBG("%s: WC wq->sq.pidx = %d\n",
__func__, wq->sq.pidx);
pio_copy((u64 __iomem *)
(wq->sq.bar2_va + SGE_UDB_WCDOORBELL),
(u64 *)wqe);
} else {
PDBG("%s: DB wq->sq.pidx = %d\n",
__func__, wq->sq.pidx);
writel(PIDX_T5_V(inc) | QID_V(wq->sq.bar2_qid),
wq->sq.bar2_va + SGE_UDB_KDOORBELL);
}
/* Flush user doorbell area writes. */
wmb();
return;
}
writel(QID_V(wq->sq.qid) | PIDX_V(inc), wq->db);
}
static inline void t4_ring_rq_db(struct t4_wq *wq, u16 inc,
union t4_recv_wr *wqe)
{
/* Flush host queue memory writes. */
wmb();
if (wq->rq.bar2_va) {
if (inc == 1 && wq->rq.bar2_qid == 0 && wqe) {
PDBG("%s: WC wq->rq.pidx = %d\n",
__func__, wq->rq.pidx);
pio_copy((u64 __iomem *)
(wq->rq.bar2_va + SGE_UDB_WCDOORBELL),
(void *)wqe);
} else {
PDBG("%s: DB wq->rq.pidx = %d\n",
__func__, wq->rq.pidx);
writel(PIDX_T5_V(inc) | QID_V(wq->rq.bar2_qid),
wq->rq.bar2_va + SGE_UDB_KDOORBELL);
}
/* Flush user doorbell area writes. */
wmb();
return;
}
writel(QID_V(wq->rq.qid) | PIDX_V(inc), wq->db);
}
static inline int t4_wq_in_error(struct t4_wq *wq)
{
return wq->rq.queue[wq->rq.size].status.qp_err;
}
static inline void t4_set_wq_in_error(struct t4_wq *wq)
{
wq->rq.queue[wq->rq.size].status.qp_err = 1;
}
static inline void t4_disable_wq_db(struct t4_wq *wq)
{
wq->rq.queue[wq->rq.size].status.db_off = 1;
}
static inline void t4_enable_wq_db(struct t4_wq *wq)
{
wq->rq.queue[wq->rq.size].status.db_off = 0;
}
static inline int t4_wq_db_enabled(struct t4_wq *wq)
{
return !wq->rq.queue[wq->rq.size].status.db_off;
}
enum t4_cq_flags {
CQ_ARMED = 1,
};
struct t4_cq {
struct t4_cqe *queue;
dma_addr_t dma_addr;
DEFINE_DMA_UNMAP_ADDR(mapping);
struct t4_cqe *sw_queue;
void __iomem *gts;
void __iomem *bar2_va;
u64 bar2_pa;
u32 bar2_qid;
struct c4iw_rdev *rdev;
size_t memsize;
__be64 bits_type_ts;
u32 cqid;
u32 qid_mask;
int vector;
u16 size; /* including status page */
u16 cidx;
u16 sw_pidx;
u16 sw_cidx;
u16 sw_in_use;
u16 cidx_inc;
u8 gen;
u8 error;
unsigned long flags;
};
static inline void write_gts(struct t4_cq *cq, u32 val)
{
if (cq->bar2_va)
writel(val | INGRESSQID_V(cq->bar2_qid),
cq->bar2_va + SGE_UDB_GTS);
else
writel(val | INGRESSQID_V(cq->cqid), cq->gts);
}
static inline int t4_clear_cq_armed(struct t4_cq *cq)
{
return test_and_clear_bit(CQ_ARMED, &cq->flags);
}
static inline int t4_arm_cq(struct t4_cq *cq, int se)
{
u32 val;
set_bit(CQ_ARMED, &cq->flags);
while (cq->cidx_inc > CIDXINC_M) {
val = SEINTARM_V(0) | CIDXINC_V(CIDXINC_M) | TIMERREG_V(7);
write_gts(cq, val);
cq->cidx_inc -= CIDXINC_M;
}
val = SEINTARM_V(se) | CIDXINC_V(cq->cidx_inc) | TIMERREG_V(6);
write_gts(cq, val);
cq->cidx_inc = 0;
return 0;
}
static inline void t4_swcq_produce(struct t4_cq *cq)
{
cq->sw_in_use++;
if (cq->sw_in_use == cq->size) {
PDBG("%s cxgb4 sw cq overflow cqid %u\n", __func__, cq->cqid);
cq->error = 1;
BUG_ON(1);
}
if (++cq->sw_pidx == cq->size)
cq->sw_pidx = 0;
}
static inline void t4_swcq_consume(struct t4_cq *cq)
{
BUG_ON(cq->sw_in_use < 1);
cq->sw_in_use--;
if (++cq->sw_cidx == cq->size)
cq->sw_cidx = 0;
}
static inline void t4_hwcq_consume(struct t4_cq *cq)
{
cq->bits_type_ts = cq->queue[cq->cidx].bits_type_ts;
if (++cq->cidx_inc == (cq->size >> 4) || cq->cidx_inc == CIDXINC_M) {
u32 val;
val = SEINTARM_V(0) | CIDXINC_V(cq->cidx_inc) | TIMERREG_V(7);
write_gts(cq, val);
cq->cidx_inc = 0;
}
if (++cq->cidx == cq->size) {
cq->cidx = 0;
cq->gen ^= 1;
}
}
static inline int t4_valid_cqe(struct t4_cq *cq, struct t4_cqe *cqe)
{
return (CQE_GENBIT(cqe) == cq->gen);
}
static inline int t4_next_hw_cqe(struct t4_cq *cq, struct t4_cqe **cqe)
{
int ret;
u16 prev_cidx;
if (cq->cidx == 0)
prev_cidx = cq->size - 1;
else
prev_cidx = cq->cidx - 1;
if (cq->queue[prev_cidx].bits_type_ts != cq->bits_type_ts) {
ret = -EOVERFLOW;
cq->error = 1;
printk(KERN_ERR MOD "cq overflow cqid %u\n", cq->cqid);
BUG_ON(1);
} else if (t4_valid_cqe(cq, &cq->queue[cq->cidx])) {
/* Ensure CQE is flushed to memory */
rmb();
*cqe = &cq->queue[cq->cidx];
ret = 0;
} else
ret = -ENODATA;
return ret;
}
static inline struct t4_cqe *t4_next_sw_cqe(struct t4_cq *cq)
{
if (cq->sw_in_use == cq->size) {
PDBG("%s cxgb4 sw cq overflow cqid %u\n", __func__, cq->cqid);
cq->error = 1;
BUG_ON(1);
return NULL;
}
if (cq->sw_in_use)
return &cq->sw_queue[cq->sw_cidx];
return NULL;
}
static inline int t4_next_cqe(struct t4_cq *cq, struct t4_cqe **cqe)
{
int ret = 0;
if (cq->error)
ret = -ENODATA;
else if (cq->sw_in_use)
*cqe = &cq->sw_queue[cq->sw_cidx];
else
ret = t4_next_hw_cqe(cq, cqe);
return ret;
}
static inline int t4_cq_in_error(struct t4_cq *cq)
{
return ((struct t4_status_page *)&cq->queue[cq->size])->qp_err;
}
static inline void t4_set_cq_in_error(struct t4_cq *cq)
{
((struct t4_status_page *)&cq->queue[cq->size])->qp_err = 1;
}
#endif
struct t4_dev_status_page {
u8 db_off;
};
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