mirror of https://gitee.com/openkylin/linux.git
135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
/*
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* Copyright(c) 2009 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Maintained at www.Open-FCoE.org
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/scatterlist.h>
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#include <linux/crc32.h>
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#include <scsi/libfc.h>
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#include "fc_libfc.h"
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MODULE_AUTHOR("Open-FCoE.org");
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MODULE_DESCRIPTION("libfc");
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MODULE_LICENSE("GPL v2");
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unsigned int fc_debug_logging;
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module_param_named(debug_logging, fc_debug_logging, int, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
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/**
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* libfc_init() - Initialize libfc.ko
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*/
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static int __init libfc_init(void)
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{
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int rc = 0;
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rc = fc_setup_fcp();
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if (rc)
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return rc;
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rc = fc_setup_exch_mgr();
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if (rc)
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goto destroy_pkt_cache;
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rc = fc_setup_rport();
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if (rc)
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goto destroy_em;
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return rc;
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destroy_em:
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fc_destroy_exch_mgr();
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destroy_pkt_cache:
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fc_destroy_fcp();
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return rc;
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}
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module_init(libfc_init);
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/**
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* libfc_exit() - Tear down libfc.ko
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*/
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static void __exit libfc_exit(void)
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{
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fc_destroy_fcp();
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fc_destroy_exch_mgr();
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fc_destroy_rport();
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}
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module_exit(libfc_exit);
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/**
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* fc_copy_buffer_to_sglist() - This routine copies the data of a buffer
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* into a scatter-gather list (SG list).
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*
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* @buf: pointer to the data buffer.
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* @len: the byte-length of the data buffer.
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* @sg: pointer to the pointer of the SG list.
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* @nents: pointer to the remaining number of entries in the SG list.
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* @offset: pointer to the current offset in the SG list.
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* @km_type: dedicated page table slot type for kmap_atomic.
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* @crc: pointer to the 32-bit crc value.
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* If crc is NULL, CRC is not calculated.
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*/
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u32 fc_copy_buffer_to_sglist(void *buf, size_t len,
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struct scatterlist *sg,
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u32 *nents, size_t *offset,
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enum km_type km_type, u32 *crc)
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{
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size_t remaining = len;
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u32 copy_len = 0;
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while (remaining > 0 && sg) {
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size_t off, sg_bytes;
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void *page_addr;
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if (*offset >= sg->length) {
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/*
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* Check for end and drop resources
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* from the last iteration.
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*/
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if (!(*nents))
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break;
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--(*nents);
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*offset -= sg->length;
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sg = sg_next(sg);
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continue;
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}
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sg_bytes = min(remaining, sg->length - *offset);
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/*
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* The scatterlist item may be bigger than PAGE_SIZE,
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* but we are limited to mapping PAGE_SIZE at a time.
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*/
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off = *offset + sg->offset;
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sg_bytes = min(sg_bytes,
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(size_t)(PAGE_SIZE - (off & ~PAGE_MASK)));
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page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT),
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km_type);
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if (crc)
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*crc = crc32(*crc, buf, sg_bytes);
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memcpy((char *)page_addr + (off & ~PAGE_MASK), buf, sg_bytes);
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kunmap_atomic(page_addr, km_type);
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buf += sg_bytes;
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*offset += sg_bytes;
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remaining -= sg_bytes;
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copy_len += sg_bytes;
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}
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return copy_len;
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}
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