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TID entries are used by hfi1 hardware to receive data payload from incoming packets directly into a user buffer and thus avoid data copying by software. This patch implements the functions for TID allocation, freeing, and programming TID RcvArray entries in hardware for kernel clients. TID entries are managed via lists of TID groups similar to PSM. Furthermore, to track TID resource allocation for each request, software flows are also allocated and freed as needed. Since software flows consume large amount of memory for tracking TID allocation and freeing, it is generally desirable to allocate them dynamically in the send queue and only for TID RDMA requests, but pre-allocate them for receive queue because the send queue could have thousands of entries while the receive queue has only a limited number of entries. Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com> Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Kaike Wan <kaike.wan@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
#ifndef _HFI1_USER_EXP_RCV_H
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#define _HFI1_USER_EXP_RCV_H
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/*
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* Copyright(c) 2015 - 2017 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "hfi.h"
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#include "exp_rcv.h"
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struct tid_pageset {
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u16 idx;
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u16 count;
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};
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struct tid_user_buf {
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unsigned long vaddr;
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unsigned long length;
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unsigned int npages;
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struct page **pages;
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struct tid_pageset *psets;
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unsigned int n_psets;
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};
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struct tid_rb_node {
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struct mmu_rb_node mmu;
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unsigned long phys;
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struct tid_group *grp;
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u32 rcventry;
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dma_addr_t dma_addr;
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bool freed;
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unsigned int npages;
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struct page *pages[0];
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};
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static inline int num_user_pages(unsigned long addr,
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unsigned long len)
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{
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const unsigned long spage = addr & PAGE_MASK;
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const unsigned long epage = (addr + len - 1) & PAGE_MASK;
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return 1 + ((epage - spage) >> PAGE_SHIFT);
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}
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int hfi1_user_exp_rcv_init(struct hfi1_filedata *fd,
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struct hfi1_ctxtdata *uctxt);
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void hfi1_user_exp_rcv_free(struct hfi1_filedata *fd);
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int hfi1_user_exp_rcv_setup(struct hfi1_filedata *fd,
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struct hfi1_tid_info *tinfo);
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int hfi1_user_exp_rcv_clear(struct hfi1_filedata *fd,
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struct hfi1_tid_info *tinfo);
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int hfi1_user_exp_rcv_invalid(struct hfi1_filedata *fd,
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struct hfi1_tid_info *tinfo);
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#endif /* _HFI1_USER_EXP_RCV_H */
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