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linux/drivers/infiniband/hw/hfi1/common.h
Don Hiatt f8195f3b14 IB/hfi1: Eliminate allocation while atomic 
The PIO trailing buffer was being dynamically allocated
but the kcalloc return value was not being checked. Further,
the GFP_KERNEL was being used even though the send engine
might be called with interrupts disabled.

Since the maximum size of the trailing buffer is only 12
bytes (CRC = 4, LT = 1, Pad = 0 to 7 bytes) just statically
allocate the buffer, remove the alloc entirely and share it
with the SDMA engine by making it global.

Reported-by: Leon Romanovsky <leon@kernel.org>
Fixes: 566d53a826 ("IB/hfi1: Enhance PIO/SDMA send for 16B")
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Don Hiatt <don.hiatt@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-10-18 10:12:59 -04:00

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/*
* Copyright(c) 2015, 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.
*
*/
#ifndef _COMMON_H
#define _COMMON_H
#include <rdma/hfi/hfi1_user.h>
/*
* This file contains defines, structures, etc. that are used
* to communicate between kernel and user code.
*/
/* version of protocol header (known to chip also). In the long run,
* we should be able to generate and accept a range of version numbers;
* for now we only accept one, and it's compiled in.
*/
#define IPS_PROTO_VERSION 2
/*
* These are compile time constants that you may want to enable or disable
* if you are trying to debug problems with code or performance.
* HFI1_VERBOSE_TRACING define as 1 if you want additional tracing in
* fast path code
* HFI1_TRACE_REGWRITES define as 1 if you want register writes to be
* traced in fast path code
* _HFI1_TRACING define as 0 if you want to remove all tracing in a
* compilation unit
*/
/*
* If a packet's QP[23:16] bits match this value, then it is
* a PSM packet and the hardware will expect a KDETH header
* following the BTH.
*/
#define DEFAULT_KDETH_QP 0x80
/* driver/hw feature set bitmask */
#define HFI1_CAP_USER_SHIFT 24
#define HFI1_CAP_MASK ((1UL << HFI1_CAP_USER_SHIFT) - 1)
/* locked flag - if set, only HFI1_CAP_WRITABLE_MASK bits can be set */
#define HFI1_CAP_LOCKED_SHIFT 63
#define HFI1_CAP_LOCKED_MASK 0x1ULL
#define HFI1_CAP_LOCKED_SMASK (HFI1_CAP_LOCKED_MASK << HFI1_CAP_LOCKED_SHIFT)
/* extra bits used between kernel and user processes */
#define HFI1_CAP_MISC_SHIFT (HFI1_CAP_USER_SHIFT * 2)
#define HFI1_CAP_MISC_MASK ((1ULL << (HFI1_CAP_LOCKED_SHIFT - \
HFI1_CAP_MISC_SHIFT)) - 1)
#define HFI1_CAP_KSET(cap) ({ hfi1_cap_mask |= HFI1_CAP_##cap; hfi1_cap_mask; })
#define HFI1_CAP_KCLEAR(cap) \
({ \
hfi1_cap_mask &= ~HFI1_CAP_##cap; \
hfi1_cap_mask; \
})
#define HFI1_CAP_USET(cap) \
({ \
hfi1_cap_mask |= (HFI1_CAP_##cap << HFI1_CAP_USER_SHIFT); \
hfi1_cap_mask; \
})
#define HFI1_CAP_UCLEAR(cap) \
({ \
hfi1_cap_mask &= ~(HFI1_CAP_##cap << HFI1_CAP_USER_SHIFT); \
hfi1_cap_mask; \
})
#define HFI1_CAP_SET(cap) \
({ \
hfi1_cap_mask |= (HFI1_CAP_##cap | (HFI1_CAP_##cap << \
HFI1_CAP_USER_SHIFT)); \
hfi1_cap_mask; \
})
#define HFI1_CAP_CLEAR(cap) \
({ \
hfi1_cap_mask &= ~(HFI1_CAP_##cap | \
(HFI1_CAP_##cap << HFI1_CAP_USER_SHIFT)); \
hfi1_cap_mask; \
})
#define HFI1_CAP_LOCK() \
({ hfi1_cap_mask |= HFI1_CAP_LOCKED_SMASK; hfi1_cap_mask; })
#define HFI1_CAP_LOCKED() (!!(hfi1_cap_mask & HFI1_CAP_LOCKED_SMASK))
/*
* The set of capability bits that can be changed after initial load
* This set is the same for kernel and user contexts. However, for
* user contexts, the set can be further filtered by using the
* HFI1_CAP_RESERVED_MASK bits.
*/
#define HFI1_CAP_WRITABLE_MASK (HFI1_CAP_SDMA_AHG | \
HFI1_CAP_HDRSUPP | \
HFI1_CAP_MULTI_PKT_EGR | \
HFI1_CAP_NODROP_RHQ_FULL | \
HFI1_CAP_NODROP_EGR_FULL | \
HFI1_CAP_ALLOW_PERM_JKEY | \
HFI1_CAP_STATIC_RATE_CTRL | \
HFI1_CAP_PRINT_UNIMPL | \
HFI1_CAP_TID_UNMAP)
/*
* A set of capability bits that are "global" and are not allowed to be
* set in the user bitmask.
*/
#define HFI1_CAP_RESERVED_MASK ((HFI1_CAP_SDMA | \
HFI1_CAP_USE_SDMA_HEAD | \
HFI1_CAP_EXTENDED_PSN | \
HFI1_CAP_PRINT_UNIMPL | \
HFI1_CAP_NO_INTEGRITY | \
HFI1_CAP_PKEY_CHECK) << \
HFI1_CAP_USER_SHIFT)
/*
* Set of capabilities that need to be enabled for kernel context in
* order to be allowed for user contexts, as well.
*/
#define HFI1_CAP_MUST_HAVE_KERN (HFI1_CAP_STATIC_RATE_CTRL)
/* Default enabled capabilities (both kernel and user) */
#define HFI1_CAP_MASK_DEFAULT (HFI1_CAP_HDRSUPP | \
HFI1_CAP_NODROP_RHQ_FULL | \
HFI1_CAP_NODROP_EGR_FULL | \
HFI1_CAP_SDMA | \
HFI1_CAP_PRINT_UNIMPL | \
HFI1_CAP_STATIC_RATE_CTRL | \
HFI1_CAP_PKEY_CHECK | \
HFI1_CAP_MULTI_PKT_EGR | \
HFI1_CAP_EXTENDED_PSN | \
((HFI1_CAP_HDRSUPP | \
HFI1_CAP_MULTI_PKT_EGR | \
HFI1_CAP_STATIC_RATE_CTRL | \
HFI1_CAP_PKEY_CHECK | \
HFI1_CAP_EARLY_CREDIT_RETURN) << \
HFI1_CAP_USER_SHIFT))
/*
* A bitmask of kernel/global capabilities that should be communicated
* to user level processes.
*/
#define HFI1_CAP_K2U (HFI1_CAP_SDMA | \
HFI1_CAP_EXTENDED_PSN | \
HFI1_CAP_PKEY_CHECK | \
HFI1_CAP_NO_INTEGRITY)
#define HFI1_USER_SWVERSION ((HFI1_USER_SWMAJOR << HFI1_SWMAJOR_SHIFT) | \
HFI1_USER_SWMINOR)
#ifndef HFI1_KERN_TYPE
#define HFI1_KERN_TYPE 0
#endif
/*
* Similarly, this is the kernel version going back to the user. It's
* slightly different, in that we want to tell if the driver was built as
* part of a Intel release, or from the driver from openfabrics.org,
* kernel.org, or a standard distribution, for support reasons.
* The high bit is 0 for non-Intel and 1 for Intel-built/supplied.
*
* It's returned by the driver to the user code during initialization in the
* spi_sw_version field of hfi1_base_info, so the user code can in turn
* check for compatibility with the kernel.
*/
#define HFI1_KERN_SWVERSION ((HFI1_KERN_TYPE << 31) | HFI1_USER_SWVERSION)
/*
* Define the driver version number. This is something that refers only
* to the driver itself, not the software interfaces it supports.
*/
#ifndef HFI1_DRIVER_VERSION_BASE
#define HFI1_DRIVER_VERSION_BASE "0.9-294"
#endif
/* create the final driver version string */
#ifdef HFI1_IDSTR
#define HFI1_DRIVER_VERSION HFI1_DRIVER_VERSION_BASE " " HFI1_IDSTR
#else
#define HFI1_DRIVER_VERSION HFI1_DRIVER_VERSION_BASE
#endif
/*
* Diagnostics can send a packet by writing the following
* struct to the diag packet special file.
*
* This allows a custom PBC qword, so that special modes and deliberate
* changes to CRCs can be used.
*/
#define _DIAG_PKT_VERS 1
struct diag_pkt {
__u16 version; /* structure version */
__u16 unit; /* which device */
__u16 sw_index; /* send sw index to use */
__u16 len; /* data length, in bytes */
__u16 port; /* port number */
__u16 unused;
__u32 flags; /* call flags */
__u64 data; /* user data pointer */
__u64 pbc; /* PBC for the packet */
};
/* diag_pkt flags */
#define F_DIAGPKT_WAIT 0x1 /* wait until packet is sent */
/*
* The next set of defines are for packet headers, and chip register
* and memory bits that are visible to and/or used by user-mode software.
*/
/*
* Receive Header Flags
*/
#define RHF_PKT_LEN_SHIFT 0
#define RHF_PKT_LEN_MASK 0xfffull
#define RHF_PKT_LEN_SMASK (RHF_PKT_LEN_MASK << RHF_PKT_LEN_SHIFT)
#define RHF_RCV_TYPE_SHIFT 12
#define RHF_RCV_TYPE_MASK 0x7ull
#define RHF_RCV_TYPE_SMASK (RHF_RCV_TYPE_MASK << RHF_RCV_TYPE_SHIFT)
#define RHF_USE_EGR_BFR_SHIFT 15
#define RHF_USE_EGR_BFR_MASK 0x1ull
#define RHF_USE_EGR_BFR_SMASK (RHF_USE_EGR_BFR_MASK << RHF_USE_EGR_BFR_SHIFT)
#define RHF_EGR_INDEX_SHIFT 16
#define RHF_EGR_INDEX_MASK 0x7ffull
#define RHF_EGR_INDEX_SMASK (RHF_EGR_INDEX_MASK << RHF_EGR_INDEX_SHIFT)
#define RHF_DC_INFO_SHIFT 27
#define RHF_DC_INFO_MASK 0x1ull
#define RHF_DC_INFO_SMASK (RHF_DC_INFO_MASK << RHF_DC_INFO_SHIFT)
#define RHF_RCV_SEQ_SHIFT 28
#define RHF_RCV_SEQ_MASK 0xfull
#define RHF_RCV_SEQ_SMASK (RHF_RCV_SEQ_MASK << RHF_RCV_SEQ_SHIFT)
#define RHF_EGR_OFFSET_SHIFT 32
#define RHF_EGR_OFFSET_MASK 0xfffull
#define RHF_EGR_OFFSET_SMASK (RHF_EGR_OFFSET_MASK << RHF_EGR_OFFSET_SHIFT)
#define RHF_HDRQ_OFFSET_SHIFT 44
#define RHF_HDRQ_OFFSET_MASK 0x1ffull
#define RHF_HDRQ_OFFSET_SMASK (RHF_HDRQ_OFFSET_MASK << RHF_HDRQ_OFFSET_SHIFT)
#define RHF_K_HDR_LEN_ERR (0x1ull << 53)
#define RHF_DC_UNC_ERR (0x1ull << 54)
#define RHF_DC_ERR (0x1ull << 55)
#define RHF_RCV_TYPE_ERR_SHIFT 56
#define RHF_RCV_TYPE_ERR_MASK 0x7ul
#define RHF_RCV_TYPE_ERR_SMASK (RHF_RCV_TYPE_ERR_MASK << RHF_RCV_TYPE_ERR_SHIFT)
#define RHF_TID_ERR (0x1ull << 59)
#define RHF_LEN_ERR (0x1ull << 60)
#define RHF_ECC_ERR (0x1ull << 61)
#define RHF_VCRC_ERR (0x1ull << 62)
#define RHF_ICRC_ERR (0x1ull << 63)
#define RHF_ERROR_SMASK 0xffe0000000000000ull /* bits 63:53 */
/* RHF receive types */
#define RHF_RCV_TYPE_EXPECTED 0
#define RHF_RCV_TYPE_EAGER 1
#define RHF_RCV_TYPE_IB 2 /* normal IB, IB Raw, or IPv6 */
#define RHF_RCV_TYPE_ERROR 3
#define RHF_RCV_TYPE_BYPASS 4
#define RHF_RCV_TYPE_INVALID5 5
#define RHF_RCV_TYPE_INVALID6 6
#define RHF_RCV_TYPE_INVALID7 7
/* RHF receive type error - expected packet errors */
#define RHF_RTE_EXPECTED_FLOW_SEQ_ERR 0x2
#define RHF_RTE_EXPECTED_FLOW_GEN_ERR 0x4
/* RHF receive type error - eager packet errors */
#define RHF_RTE_EAGER_NO_ERR 0x0
/* RHF receive type error - IB packet errors */
#define RHF_RTE_IB_NO_ERR 0x0
/* RHF receive type error - error packet errors */
#define RHF_RTE_ERROR_NO_ERR 0x0
#define RHF_RTE_ERROR_OP_CODE_ERR 0x1
#define RHF_RTE_ERROR_KHDR_MIN_LEN_ERR 0x2
#define RHF_RTE_ERROR_KHDR_HCRC_ERR 0x3
#define RHF_RTE_ERROR_KHDR_KVER_ERR 0x4
#define RHF_RTE_ERROR_CONTEXT_ERR 0x5
#define RHF_RTE_ERROR_KHDR_TID_ERR 0x6
/* RHF receive type error - bypass packet errors */
#define RHF_RTE_BYPASS_NO_ERR 0x0
/* IB - LRH header constants */
#define HFI1_LRH_GRH 0x0003 /* 1. word of IB LRH - next header: GRH */
#define HFI1_LRH_BTH 0x0002 /* 1. word of IB LRH - next header: BTH */
/* misc. */
#define SC15_PACKET 0xF
#define SIZE_OF_CRC 1
#define SIZE_OF_LT 1
#define MAX_16B_PADDING 12 /* CRC = 4, LT = 1, Pad = 0 to 7 bytes */
#define LIM_MGMT_P_KEY 0x7FFF
#define FULL_MGMT_P_KEY 0xFFFF
#define DEFAULT_P_KEY LIM_MGMT_P_KEY
#define HFI1_PSM_IOC_BASE_SEQ 0x0
static inline __u64 rhf_to_cpu(const __le32 *rbuf)
{
return __le64_to_cpu(*((__le64 *)rbuf));
}
static inline u64 rhf_err_flags(u64 rhf)
{
return rhf & RHF_ERROR_SMASK;
}
static inline u32 rhf_rcv_type(u64 rhf)
{
return (rhf >> RHF_RCV_TYPE_SHIFT) & RHF_RCV_TYPE_MASK;
}
static inline u32 rhf_rcv_type_err(u64 rhf)
{
return (rhf >> RHF_RCV_TYPE_ERR_SHIFT) & RHF_RCV_TYPE_ERR_MASK;
}
/* return size is in bytes, not DWORDs */
static inline u32 rhf_pkt_len(u64 rhf)
{
return ((rhf & RHF_PKT_LEN_SMASK) >> RHF_PKT_LEN_SHIFT) << 2;
}
static inline u32 rhf_egr_index(u64 rhf)
{
return (rhf >> RHF_EGR_INDEX_SHIFT) & RHF_EGR_INDEX_MASK;
}
static inline u32 rhf_rcv_seq(u64 rhf)
{
return (rhf >> RHF_RCV_SEQ_SHIFT) & RHF_RCV_SEQ_MASK;
}
/* returned offset is in DWORDS */
static inline u32 rhf_hdrq_offset(u64 rhf)
{
return (rhf >> RHF_HDRQ_OFFSET_SHIFT) & RHF_HDRQ_OFFSET_MASK;
}
static inline u64 rhf_use_egr_bfr(u64 rhf)
{
return rhf & RHF_USE_EGR_BFR_SMASK;
}
static inline u64 rhf_dc_info(u64 rhf)
{
return rhf & RHF_DC_INFO_SMASK;
}
static inline u32 rhf_egr_buf_offset(u64 rhf)
{
return (rhf >> RHF_EGR_OFFSET_SHIFT) & RHF_EGR_OFFSET_MASK;
}
#endif /* _COMMON_H */
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