18866a5d9SRobert Love /* 28866a5d9SRobert Love * Copyright(c) 2009 Intel Corporation. All rights reserved. 38866a5d9SRobert Love * 48866a5d9SRobert Love * This program is free software; you can redistribute it and/or modify it 58866a5d9SRobert Love * under the terms and conditions of the GNU General Public License, 68866a5d9SRobert Love * version 2, as published by the Free Software Foundation. 78866a5d9SRobert Love * 88866a5d9SRobert Love * This program is distributed in the hope it will be useful, but WITHOUT 98866a5d9SRobert Love * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 108866a5d9SRobert Love * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 118866a5d9SRobert Love * more details. 128866a5d9SRobert Love * 138866a5d9SRobert Love * You should have received a copy of the GNU General Public License along with 148866a5d9SRobert Love * this program; if not, write to the Free Software Foundation, Inc., 158866a5d9SRobert Love * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 168866a5d9SRobert Love * 178866a5d9SRobert Love * Maintained at www.Open-FCoE.org 188866a5d9SRobert Love */ 198866a5d9SRobert Love 208866a5d9SRobert Love #include <linux/kernel.h> 218866a5d9SRobert Love #include <linux/types.h> 228866a5d9SRobert Love #include <linux/scatterlist.h> 238866a5d9SRobert Love #include <linux/crc32.h> 248866a5d9SRobert Love 258866a5d9SRobert Love #include <scsi/libfc.h> 2624f089e2SJoe Eykholt #include <scsi/fc_encode.h> 278866a5d9SRobert Love 288866a5d9SRobert Love #include "fc_libfc.h" 298866a5d9SRobert Love 308866a5d9SRobert Love MODULE_AUTHOR("Open-FCoE.org"); 318866a5d9SRobert Love MODULE_DESCRIPTION("libfc"); 328866a5d9SRobert Love MODULE_LICENSE("GPL v2"); 338866a5d9SRobert Love 348866a5d9SRobert Love unsigned int fc_debug_logging; 358866a5d9SRobert Love module_param_named(debug_logging, fc_debug_logging, int, S_IRUGO|S_IWUSR); 368866a5d9SRobert Love MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); 3793e6d5abSRobert Love 3893e6d5abSRobert Love /** 3993e6d5abSRobert Love * libfc_init() - Initialize libfc.ko 4093e6d5abSRobert Love */ 4193e6d5abSRobert Love static int __init libfc_init(void) 4293e6d5abSRobert Love { 4393e6d5abSRobert Love int rc = 0; 4493e6d5abSRobert Love 4593e6d5abSRobert Love rc = fc_setup_fcp(); 4693e6d5abSRobert Love if (rc) 4793e6d5abSRobert Love return rc; 4893e6d5abSRobert Love 4993e6d5abSRobert Love rc = fc_setup_exch_mgr(); 5093e6d5abSRobert Love if (rc) 5193e6d5abSRobert Love goto destroy_pkt_cache; 5293e6d5abSRobert Love 5393e6d5abSRobert Love rc = fc_setup_rport(); 5493e6d5abSRobert Love if (rc) 5593e6d5abSRobert Love goto destroy_em; 5693e6d5abSRobert Love 5793e6d5abSRobert Love return rc; 5893e6d5abSRobert Love destroy_em: 5993e6d5abSRobert Love fc_destroy_exch_mgr(); 6093e6d5abSRobert Love destroy_pkt_cache: 6193e6d5abSRobert Love fc_destroy_fcp(); 6293e6d5abSRobert Love return rc; 6393e6d5abSRobert Love } 6493e6d5abSRobert Love module_init(libfc_init); 6593e6d5abSRobert Love 6693e6d5abSRobert Love /** 6793e6d5abSRobert Love * libfc_exit() - Tear down libfc.ko 6893e6d5abSRobert Love */ 6993e6d5abSRobert Love static void __exit libfc_exit(void) 7093e6d5abSRobert Love { 7193e6d5abSRobert Love fc_destroy_fcp(); 7293e6d5abSRobert Love fc_destroy_exch_mgr(); 7393e6d5abSRobert Love fc_destroy_rport(); 7493e6d5abSRobert Love } 7593e6d5abSRobert Love module_exit(libfc_exit); 7658682874SRobert Love 7758682874SRobert Love /** 7858682874SRobert Love * fc_copy_buffer_to_sglist() - This routine copies the data of a buffer 7958682874SRobert Love * into a scatter-gather list (SG list). 8058682874SRobert Love * 8158682874SRobert Love * @buf: pointer to the data buffer. 8258682874SRobert Love * @len: the byte-length of the data buffer. 8358682874SRobert Love * @sg: pointer to the pointer of the SG list. 8458682874SRobert Love * @nents: pointer to the remaining number of entries in the SG list. 8558682874SRobert Love * @offset: pointer to the current offset in the SG list. 8658682874SRobert Love * @km_type: dedicated page table slot type for kmap_atomic. 8758682874SRobert Love * @crc: pointer to the 32-bit crc value. 8858682874SRobert Love * If crc is NULL, CRC is not calculated. 8958682874SRobert Love */ 9058682874SRobert Love u32 fc_copy_buffer_to_sglist(void *buf, size_t len, 9158682874SRobert Love struct scatterlist *sg, 9258682874SRobert Love u32 *nents, size_t *offset, 9358682874SRobert Love enum km_type km_type, u32 *crc) 9458682874SRobert Love { 9558682874SRobert Love size_t remaining = len; 9658682874SRobert Love u32 copy_len = 0; 9758682874SRobert Love 9858682874SRobert Love while (remaining > 0 && sg) { 9958682874SRobert Love size_t off, sg_bytes; 10058682874SRobert Love void *page_addr; 10158682874SRobert Love 10258682874SRobert Love if (*offset >= sg->length) { 10358682874SRobert Love /* 10458682874SRobert Love * Check for end and drop resources 10558682874SRobert Love * from the last iteration. 10658682874SRobert Love */ 10758682874SRobert Love if (!(*nents)) 10858682874SRobert Love break; 10958682874SRobert Love --(*nents); 11058682874SRobert Love *offset -= sg->length; 11158682874SRobert Love sg = sg_next(sg); 11258682874SRobert Love continue; 11358682874SRobert Love } 11458682874SRobert Love sg_bytes = min(remaining, sg->length - *offset); 11558682874SRobert Love 11658682874SRobert Love /* 11758682874SRobert Love * The scatterlist item may be bigger than PAGE_SIZE, 11858682874SRobert Love * but we are limited to mapping PAGE_SIZE at a time. 11958682874SRobert Love */ 12058682874SRobert Love off = *offset + sg->offset; 12158682874SRobert Love sg_bytes = min(sg_bytes, 12258682874SRobert Love (size_t)(PAGE_SIZE - (off & ~PAGE_MASK))); 12358682874SRobert Love page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT), 12458682874SRobert Love km_type); 12558682874SRobert Love if (crc) 12658682874SRobert Love *crc = crc32(*crc, buf, sg_bytes); 12758682874SRobert Love memcpy((char *)page_addr + (off & ~PAGE_MASK), buf, sg_bytes); 12858682874SRobert Love kunmap_atomic(page_addr, km_type); 12958682874SRobert Love buf += sg_bytes; 13058682874SRobert Love *offset += sg_bytes; 13158682874SRobert Love remaining -= sg_bytes; 13258682874SRobert Love copy_len += sg_bytes; 13358682874SRobert Love } 13458682874SRobert Love return copy_len; 13558682874SRobert Love } 13624f089e2SJoe Eykholt 13724f089e2SJoe Eykholt /** 13824f089e2SJoe Eykholt * fc_fill_hdr() - fill FC header fields based on request 13924f089e2SJoe Eykholt * @fp: reply frame containing header to be filled in 14024f089e2SJoe Eykholt * @in_fp: request frame containing header to use in filling in reply 14124f089e2SJoe Eykholt * @r_ctl: R_CTL value for header 14224f089e2SJoe Eykholt * @f_ctl: F_CTL value for header, with 0 pad 14324f089e2SJoe Eykholt * @seq_cnt: sequence count for the header, ignored if frame has a sequence 14424f089e2SJoe Eykholt * @parm_offset: parameter / offset value 14524f089e2SJoe Eykholt */ 14624f089e2SJoe Eykholt void fc_fill_hdr(struct fc_frame *fp, const struct fc_frame *in_fp, 14724f089e2SJoe Eykholt enum fc_rctl r_ctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset) 14824f089e2SJoe Eykholt { 14924f089e2SJoe Eykholt struct fc_frame_header *fh; 15024f089e2SJoe Eykholt struct fc_frame_header *in_fh; 15124f089e2SJoe Eykholt struct fc_seq *sp; 15224f089e2SJoe Eykholt u32 fill; 15324f089e2SJoe Eykholt 15424f089e2SJoe Eykholt fh = __fc_frame_header_get(fp); 15524f089e2SJoe Eykholt in_fh = __fc_frame_header_get(in_fp); 15624f089e2SJoe Eykholt 15724f089e2SJoe Eykholt if (f_ctl & FC_FC_END_SEQ) { 15824f089e2SJoe Eykholt fill = -fr_len(fp) & 3; 15924f089e2SJoe Eykholt if (fill) { 16024f089e2SJoe Eykholt /* TODO, this may be a problem with fragmented skb */ 16124f089e2SJoe Eykholt memset(skb_put(fp_skb(fp), fill), 0, fill); 16224f089e2SJoe Eykholt f_ctl |= fill; 16324f089e2SJoe Eykholt } 16424f089e2SJoe Eykholt fr_eof(fp) = FC_EOF_T; 16524f089e2SJoe Eykholt } else { 16624f089e2SJoe Eykholt WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ 16724f089e2SJoe Eykholt fr_eof(fp) = FC_EOF_N; 16824f089e2SJoe Eykholt } 16924f089e2SJoe Eykholt 17024f089e2SJoe Eykholt fh->fh_r_ctl = r_ctl; 17124f089e2SJoe Eykholt memcpy(fh->fh_d_id, in_fh->fh_s_id, sizeof(fh->fh_d_id)); 17224f089e2SJoe Eykholt memcpy(fh->fh_s_id, in_fh->fh_d_id, sizeof(fh->fh_s_id)); 17324f089e2SJoe Eykholt fh->fh_type = in_fh->fh_type; 17424f089e2SJoe Eykholt hton24(fh->fh_f_ctl, f_ctl); 17524f089e2SJoe Eykholt fh->fh_ox_id = in_fh->fh_ox_id; 17624f089e2SJoe Eykholt fh->fh_rx_id = in_fh->fh_rx_id; 17724f089e2SJoe Eykholt fh->fh_cs_ctl = 0; 17824f089e2SJoe Eykholt fh->fh_df_ctl = 0; 17924f089e2SJoe Eykholt fh->fh_parm_offset = htonl(parm_offset); 18024f089e2SJoe Eykholt 18124f089e2SJoe Eykholt sp = fr_seq(in_fp); 18224f089e2SJoe Eykholt if (sp) { 18324f089e2SJoe Eykholt fr_seq(fp) = sp; 18424f089e2SJoe Eykholt fh->fh_seq_id = sp->id; 18524f089e2SJoe Eykholt seq_cnt = sp->cnt; 18624f089e2SJoe Eykholt } else { 18724f089e2SJoe Eykholt fh->fh_seq_id = 0; 18824f089e2SJoe Eykholt } 18924f089e2SJoe Eykholt fh->fh_seq_cnt = ntohs(seq_cnt); 19024f089e2SJoe Eykholt fr_sof(fp) = seq_cnt ? FC_SOF_N3 : FC_SOF_I3; 19124f089e2SJoe Eykholt fr_encaps(fp) = fr_encaps(in_fp); 19224f089e2SJoe Eykholt } 19324f089e2SJoe Eykholt EXPORT_SYMBOL(fc_fill_hdr); 19424f089e2SJoe Eykholt 19524f089e2SJoe Eykholt /** 19624f089e2SJoe Eykholt * fc_fill_reply_hdr() - fill FC reply header fields based on request 19724f089e2SJoe Eykholt * @fp: reply frame containing header to be filled in 19824f089e2SJoe Eykholt * @in_fp: request frame containing header to use in filling in reply 19924f089e2SJoe Eykholt * @r_ctl: R_CTL value for reply 20024f089e2SJoe Eykholt * @parm_offset: parameter / offset value 20124f089e2SJoe Eykholt */ 20224f089e2SJoe Eykholt void fc_fill_reply_hdr(struct fc_frame *fp, const struct fc_frame *in_fp, 20324f089e2SJoe Eykholt enum fc_rctl r_ctl, u32 parm_offset) 20424f089e2SJoe Eykholt { 20524f089e2SJoe Eykholt struct fc_seq *sp; 20624f089e2SJoe Eykholt 20724f089e2SJoe Eykholt sp = fr_seq(in_fp); 20824f089e2SJoe Eykholt if (sp) 20924f089e2SJoe Eykholt fr_seq(fp) = fr_dev(in_fp)->tt.seq_start_next(sp); 21024f089e2SJoe Eykholt fc_fill_hdr(fp, in_fp, r_ctl, FC_FCTL_RESP, 0, parm_offset); 21124f089e2SJoe Eykholt } 21224f089e2SJoe Eykholt EXPORT_SYMBOL(fc_fill_reply_hdr); 213