Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 319 insertions, 0 deletions

diff --git a/drivers/scsi/libfc/fc_libfc.c b/drivers/scsi/libfc/fc_libfc.c
new file mode 100644
index 000000000..0e6a1355d
--- /dev/null
+++ b/drivers/scsi/libfc/fc_libfc.c
@@ -0,0 +1,319 @@
+// 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);
+}