3a3b42bf89
This patch makes a variety of cleanup changes to all libfc files. This patch adds kernel-doc headers to all functions lacking them and attempts to better format existing headers. It also add kernel-doc headers to structures. This patch ensures that the current naming conventions for local ports, remote ports and remote port private data is upheld in the following manner. struct instance (i.e. variable name) -------------------------------------------------- fc_lport lport fc_rport rport fc_rport_libfc_priv rpriv fc_rport_priv rdata I also renamed dns_rp and ptp_rp to dns_rdata and ptp_rdata respectively. I used emacs 'indent-region' and 'tabify' on all libfc files to correct spacing alignments. I feel sorry for anyone attempting to review this patch. Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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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