// SPDX-License-Identifier: GPL-2.0-only/* * Copyright(c) 2009 Intel Corporation. All rights reserved. * * Maintained at www.Open-FCoE.org */ #include <linux/kernel.h>#include <linux/types.h>#include <linux/scatterlist.h>#include <linux/crc32.h>#include <linux/module.h> #include <scsi/libfc.h> #include "fc_encode.h"#include "fc_libfc.h" MODULE_AUTHOR("Open-FCoE.org");MODULE_DESCRIPTION("libfc");MODULE_LICENSE("GPL v2"); unsigned int fc_debug_logging;module_param_named(debug_logging, fc_debug_logging, int, S_IRUGO|S_IWUSR);MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); DEFINE_MUTEX(fc_prov_mutex);static LIST_HEAD(fc_local_ports);struct blocking_notifier_head fc_lport_notifier_head =		BLOCKING_NOTIFIER_INIT(fc_lport_notifier_head);EXPORT_SYMBOL(fc_lport_notifier_head); /* * Providers which primarily send requests and PRLIs. */struct fc4_prov *fc_active_prov[FC_FC4_PROV_SIZE] = {	[0] = &fc_rport_t0_prov,	[FC_TYPE_FCP] = &fc_rport_fcp_init,}; /* * Providers which receive requests. */struct fc4_prov *fc_passive_prov[FC_FC4_PROV_SIZE] = {	[FC_TYPE_ELS] = &fc_lport_els_prov,}; /** * libfc_init() - Initialize libfc.ko */static int __init libfc_init(void){	int rc = 0; 	rc = fc_setup_fcp();	if (rc)		return rc; 	rc = fc_setup_exch_mgr();	if (rc)		goto destroy_pkt_cache; 	rc = fc_setup_rport();	if (rc)		goto destroy_em; 	return rc;destroy_em:	fc_destroy_exch_mgr();destroy_pkt_cache:	fc_destroy_fcp();	return rc;}module_init(libfc_init); /** * libfc_exit() - Tear down libfc.ko */static void __exit libfc_exit(void){	fc_destroy_fcp();	fc_destroy_exch_mgr();	fc_destroy_rport();}module_exit(libfc_exit); /** * fc_copy_buffer_to_sglist() - This routine copies the data of a buffer *				into a scatter-gather list (SG list). * * @buf: pointer to the data buffer. * @len: the byte-length of the data buffer. * @sg: pointer to the pointer of the SG list. * @nents: pointer to the remaining number of entries in the SG list. * @offset: pointer to the current offset in the SG list. * @crc: pointer to the 32-bit crc value. *	 If crc is NULL, CRC is not calculated. */u32 fc_copy_buffer_to_sglist(void *buf, size_t len,			     struct scatterlist *sg,			     u32 *nents, size_t *offset,			     u32 *crc){	size_t remaining = len;	u32 copy_len = 0; 	while (remaining > 0 && sg) {		size_t off, sg_bytes;		void *page_addr; 		if (*offset >= sg->length) {			/*			 * Check for end and drop resources			 * from the last iteration.			 */			if (!(*nents))				break;			--(*nents);			*offset -= sg->length;			sg = sg_next(sg);			continue;		}		sg_bytes = min(remaining, sg->length - *offset); 		/*		 * The scatterlist item may be bigger than PAGE_SIZE,		 * but we are limited to mapping PAGE_SIZE at a time.		 */		off = *offset + sg->offset;		sg_bytes = min(sg_bytes,			       (size_t)(PAGE_SIZE - (off & ~PAGE_MASK)));		page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT));		if (crc)			*crc = crc32(*crc, buf, sg_bytes);		memcpy((char *)page_addr + (off & ~PAGE_MASK), buf, sg_bytes);		kunmap_atomic(page_addr);		buf += sg_bytes;		*offset += sg_bytes;		remaining -= sg_bytes;		copy_len += sg_bytes;	}	return copy_len;} /** * fc_fill_hdr() -  fill FC header fields based on request * @fp: reply frame containing header to be filled in * @in_fp: request frame containing header to use in filling in reply * @r_ctl: R_CTL value for header * @f_ctl: F_CTL value for header, with 0 pad * @seq_cnt: sequence count for the header, ignored if frame has a sequence * @parm_offset: parameter / offset value */void fc_fill_hdr(struct fc_frame *fp, const struct fc_frame *in_fp,		 enum fc_rctl r_ctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset){	struct fc_frame_header *fh;	struct fc_frame_header *in_fh;	struct fc_seq *sp;	u32 fill; 	fh = __fc_frame_header_get(fp);	in_fh = __fc_frame_header_get(in_fp); 	if (f_ctl & FC_FC_END_SEQ) {		fill = -fr_len(fp) & 3;		if (fill) {			/* TODO, this may be a problem with fragmented skb */			skb_put_zero(fp_skb(fp), fill);			f_ctl |= fill;		}		fr_eof(fp) = FC_EOF_T;	} else {		WARN_ON(fr_len(fp) % 4 != 0);	/* no pad to non last frame */		fr_eof(fp) = FC_EOF_N;	} 	fh->fh_r_ctl = r_ctl;	memcpy(fh->fh_d_id, in_fh->fh_s_id, sizeof(fh->fh_d_id));	memcpy(fh->fh_s_id, in_fh->fh_d_id, sizeof(fh->fh_s_id));	fh->fh_type = in_fh->fh_type;	hton24(fh->fh_f_ctl, f_ctl);	fh->fh_ox_id = in_fh->fh_ox_id;	fh->fh_rx_id = in_fh->fh_rx_id;	fh->fh_cs_ctl = 0;	fh->fh_df_ctl = 0;	fh->fh_parm_offset = htonl(parm_offset); 	sp = fr_seq(in_fp);	if (sp) {		fr_seq(fp) = sp;		fh->fh_seq_id = sp->id;		seq_cnt = sp->cnt;	} else {		fh->fh_seq_id = 0;	}	fh->fh_seq_cnt = ntohs(seq_cnt);	fr_sof(fp) = seq_cnt ? FC_SOF_N3 : FC_SOF_I3;	fr_encaps(fp) = fr_encaps(in_fp);}EXPORT_SYMBOL(fc_fill_hdr); /** * fc_fill_reply_hdr() -  fill FC reply header fields based on request * @fp: reply frame containing header to be filled in * @in_fp: request frame containing header to use in filling in reply * @r_ctl: R_CTL value for reply * @parm_offset: parameter / offset value */void fc_fill_reply_hdr(struct fc_frame *fp, const struct fc_frame *in_fp,		       enum fc_rctl r_ctl, u32 parm_offset){	struct fc_seq *sp; 	sp = fr_seq(in_fp);	if (sp)		fr_seq(fp) = fc_seq_start_next(sp);	fc_fill_hdr(fp, in_fp, r_ctl, FC_FCTL_RESP, 0, parm_offset);}EXPORT_SYMBOL(fc_fill_reply_hdr); /** * fc_fc4_conf_lport_params() - Modify "service_params" of specified lport * if there is service provider (target provider) registered with libfc * for specified "fc_ft_type" * @lport: Local port which service_params needs to be modified * @type: FC-4 type, such as FC_TYPE_FCP */void fc_fc4_conf_lport_params(struct fc_lport *lport, enum fc_fh_type type){	struct fc4_prov *prov_entry;	BUG_ON(type >= FC_FC4_PROV_SIZE);	BUG_ON(!lport);	prov_entry = fc_passive_prov[type];	if (type == FC_TYPE_FCP) {		if (prov_entry && prov_entry->recv)			lport->service_params |= FCP_SPPF_TARG_FCN;	}} void fc_lport_iterate(void (*notify)(struct fc_lport *, void *), void *arg){	struct fc_lport *lport; 	mutex_lock(&fc_prov_mutex);	list_for_each_entry(lport, &fc_local_ports, lport_list)		notify(lport, arg);	mutex_unlock(&fc_prov_mutex);}EXPORT_SYMBOL(fc_lport_iterate); /** * fc_fc4_register_provider() - register FC-4 upper-level provider. * @type: FC-4 type, such as FC_TYPE_FCP * @prov: structure describing provider including ops vector. * * Returns 0 on success, negative error otherwise. */int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *prov){	struct fc4_prov **prov_entry;	int ret = 0; 	if (type >= FC_FC4_PROV_SIZE)		return -EINVAL;	mutex_lock(&fc_prov_mutex);	prov_entry = (prov->recv ? fc_passive_prov : fc_active_prov) + type;	if (*prov_entry)		ret = -EBUSY;	else		*prov_entry = prov;	mutex_unlock(&fc_prov_mutex);	return ret;}EXPORT_SYMBOL(fc_fc4_register_provider); /** * fc_fc4_deregister_provider() - deregister FC-4 upper-level provider. * @type: FC-4 type, such as FC_TYPE_FCP * @prov: structure describing provider including ops vector. */void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *prov){	BUG_ON(type >= FC_FC4_PROV_SIZE);	mutex_lock(&fc_prov_mutex);	if (prov->recv)		RCU_INIT_POINTER(fc_passive_prov[type], NULL);	else		RCU_INIT_POINTER(fc_active_prov[type], NULL);	mutex_unlock(&fc_prov_mutex);	synchronize_rcu();}EXPORT_SYMBOL(fc_fc4_deregister_provider); /** * fc_fc4_add_lport() - add new local port to list and run notifiers. * @lport:  The new local port. */void fc_fc4_add_lport(struct fc_lport *lport){	mutex_lock(&fc_prov_mutex);	list_add_tail(&lport->lport_list, &fc_local_ports);	blocking_notifier_call_chain(&fc_lport_notifier_head,				     FC_LPORT_EV_ADD, lport);	mutex_unlock(&fc_prov_mutex);} /** * fc_fc4_del_lport() - remove local port from list and run notifiers. * @lport:  The new local port. */void fc_fc4_del_lport(struct fc_lport *lport){	mutex_lock(&fc_prov_mutex);	list_del(&lport->lport_list);	blocking_notifier_call_chain(&fc_lport_notifier_head,				     FC_LPORT_EV_DEL, lport);	mutex_unlock(&fc_prov_mutex);}