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Commit 1cb78d73 authored Jun 14, 2012 by Vikas Chaudhary Committed by James Bottomley Jul 20, 2012

[SCSI] qla4xxx: multi-session fix for flash ddbs



Allow multi-session to target (for flash ddbs) accesible via
multiple network portal

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

parent bc97f4bb

drivers/scsi/qla4xxx/ql4_def.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -279,6 +279,7 @@ struct qla_ddb_index {
		struct list_head list;
		uint16_t fw_ddb_idx;
		struct dev_db_entry fw_ddb;
		uint8_t flash_isid[6];
		};

		#define DDB_IPADDR_LEN 64

drivers/scsi/qla4xxx/ql4_os.c

+143 −13

Original line number	Diff line number	Diff line
		@@ -4299,7 +4299,8 @@ static void qla4xxx_get_param_ddb(struct ddb_entry *ddb_entry,
		}

		static void qla4xxx_convert_param_ddb(struct dev_db_entry *fw_ddb_entry,
		struct ql4_tuple_ddb *tddb)
		struct ql4_tuple_ddb *tddb,
		uint8_t *flash_isid)
		{
		uint16_t options = 0;

		@@ -4314,7 +4315,12 @@ static void qla4xxx_convert_param_ddb(struct dev_db_entry *fw_ddb_entry,
		sprintf(tddb->ip_addr, "%pI4", fw_ddb_entry->ip_addr);

		tddb->port = le16_to_cpu(fw_ddb_entry->port);
		memcpy(&tddb->isid[0], &fw_ddb_entry->isid[0], sizeof(tddb->isid));

		if (flash_isid == NULL)
		memcpy(&tddb->isid[0], &fw_ddb_entry->isid[0],
		sizeof(tddb->isid));
		else
		memcpy(&tddb->isid[0], &flash_isid[0], sizeof(tddb->isid));
		}

		static int qla4xxx_compare_tuple_ddb(struct scsi_qla_host *ha,
		@@ -4385,7 +4391,7 @@ static int qla4xxx_is_session_exists(struct scsi_qla_host *ha,
		goto exit_check;
		}

		qla4xxx_convert_param_ddb(fw_ddb_entry, fw_tddb);
		qla4xxx_convert_param_ddb(fw_ddb_entry, fw_tddb, NULL);

		for (idx = 0; idx < MAX_DDB_ENTRIES; idx++) {
		ddb_entry = qla4xxx_lookup_ddb_by_fw_index(ha, idx);
		@@ -4407,6 +4413,102 @@ static int qla4xxx_is_session_exists(struct scsi_qla_host *ha,
		return ret;
		}

		/**
		* qla4xxx_check_existing_isid - check if target with same isid exist
		* in target list
		* @list_nt: list of target
		* @isid: isid to check
		*
		* This routine return QLA_SUCCESS if target with same isid exist
		**/
		static int qla4xxx_check_existing_isid(struct list_head list_nt, uint8_t isid)
		{
		struct qla_ddb_index nt_ddb_idx, nt_ddb_idx_tmp;
		struct dev_db_entry *fw_ddb_entry;

		list_for_each_entry_safe(nt_ddb_idx, nt_ddb_idx_tmp, list_nt, list) {
		fw_ddb_entry = &nt_ddb_idx->fw_ddb;

		if (memcmp(&fw_ddb_entry->isid[0], &isid[0],
		sizeof(nt_ddb_idx->fw_ddb.isid)) == 0) {
		return QLA_SUCCESS;
		}
		}
		return QLA_ERROR;
		}

		/**
		* qla4xxx_update_isid - compare ddbs and updated isid
		* @ha: Pointer to host adapter structure.
		* @list_nt: list of nt target
		* @fw_ddb_entry: firmware ddb entry
		*
		* This routine update isid if ddbs have same iqn, same isid and
		* different IP addr.
		* Return QLA_SUCCESS if isid is updated.
		**/
		static int qla4xxx_update_isid(struct scsi_qla_host *ha,
		struct list_head *list_nt,
		struct dev_db_entry *fw_ddb_entry)
		{
		uint8_t base_value, i;

		base_value = fw_ddb_entry->isid[1] & 0x1f;
		for (i = 0; i < 8; i++) {
		fw_ddb_entry->isid[1] = (base_value \| (i << 5));
		if (qla4xxx_check_existing_isid(list_nt, fw_ddb_entry->isid))
		break;
		}

		if (!qla4xxx_check_existing_isid(list_nt, fw_ddb_entry->isid))
		return QLA_ERROR;

		return QLA_SUCCESS;
		}

		/**
		* qla4xxx_should_update_isid - check if isid need to update
		* @ha: Pointer to host adapter structure.
		* @old_tddb: ddb tuple
		* @new_tddb: ddb tuple
		*
		* Return QLA_SUCCESS if different IP, different PORT, same iqn,
		* same isid
		**/
		static int qla4xxx_should_update_isid(struct scsi_qla_host *ha,
		struct ql4_tuple_ddb *old_tddb,
		struct ql4_tuple_ddb *new_tddb)
		{
		if (strcmp(old_tddb->ip_addr, new_tddb->ip_addr) == 0) {
		/* Same ip */
		if (old_tddb->port == new_tddb->port)
		return QLA_ERROR;
		}

		if (strcmp(old_tddb->iscsi_name, new_tddb->iscsi_name))
		/* different iqn */
		return QLA_ERROR;

		if (memcmp(&old_tddb->isid[0], &new_tddb->isid[0],
		sizeof(old_tddb->isid)))
		/* different isid */
		return QLA_ERROR;

		return QLA_SUCCESS;
		}

		/**
		* qla4xxx_is_flash_ddb_exists - check if fw_ddb_entry already exists in list_nt
		* @ha: Pointer to host adapter structure.
		* @list_nt: list of nt target.
		* @fw_ddb_entry: firmware ddb entry.
		*
		* This routine check if fw_ddb_entry already exists in list_nt to avoid
		* duplicate ddb in list_nt.
		* Return QLA_SUCCESS if duplicate ddb exit in list_nl.
		* Note: This function also update isid of DDB if required.
		**/

		static int qla4xxx_is_flash_ddb_exists(struct scsi_qla_host *ha,
		struct list_head *list_nt,
		struct dev_db_entry *fw_ddb_entry)
		@@ -4414,7 +4516,7 @@ static int qla4xxx_is_flash_ddb_exists(struct scsi_qla_host *ha,
		struct qla_ddb_index nt_ddb_idx, nt_ddb_idx_tmp;
		struct ql4_tuple_ddb *fw_tddb = NULL;
		struct ql4_tuple_ddb *tmp_tddb = NULL;
		int ret = QLA_ERROR;
		int rval, ret = QLA_ERROR;

		fw_tddb = vzalloc(sizeof(*fw_tddb));
		if (!fw_tddb) {
		@@ -4432,12 +4534,28 @@ static int qla4xxx_is_flash_ddb_exists(struct scsi_qla_host *ha,
		goto exit_check;
		}

		qla4xxx_convert_param_ddb(fw_ddb_entry, fw_tddb);
		qla4xxx_convert_param_ddb(fw_ddb_entry, fw_tddb, NULL);

		list_for_each_entry_safe(nt_ddb_idx, nt_ddb_idx_tmp, list_nt, list) {
		qla4xxx_convert_param_ddb(&nt_ddb_idx->fw_ddb, tmp_tddb);
		if (!qla4xxx_compare_tuple_ddb(ha, fw_tddb, tmp_tddb, true)) {
		ret = QLA_SUCCESS; /* found */
		qla4xxx_convert_param_ddb(&nt_ddb_idx->fw_ddb, tmp_tddb,
		nt_ddb_idx->flash_isid);
		ret = qla4xxx_compare_tuple_ddb(ha, fw_tddb, tmp_tddb, true);
		/* found duplicate ddb */
		if (ret == QLA_SUCCESS)
		goto exit_check;
		}

		list_for_each_entry_safe(nt_ddb_idx, nt_ddb_idx_tmp, list_nt, list) {
		qla4xxx_convert_param_ddb(&nt_ddb_idx->fw_ddb, tmp_tddb, NULL);

		ret = qla4xxx_should_update_isid(ha, tmp_tddb, fw_tddb);
		if (ret == QLA_SUCCESS) {
		rval = qla4xxx_update_isid(ha, list_nt, fw_ddb_entry);
		if (rval == QLA_SUCCESS)
		ret = QLA_ERROR;
		else
		ret = QLA_SUCCESS;

		goto exit_check;
		}
		}
		@@ -4788,14 +4906,26 @@ static void qla4xxx_build_nt_list(struct scsi_qla_host *ha,

		nt_ddb_idx->fw_ddb_idx = idx;

		memcpy(&nt_ddb_idx->fw_ddb, fw_ddb_entry,
		sizeof(struct dev_db_entry));
		/* Copy original isid as it may get updated in function
		* qla4xxx_update_isid(). We need original isid in
		* function qla4xxx_compare_tuple_ddb to find duplicate
		* target */
		memcpy(&nt_ddb_idx->flash_isid[0],
		&fw_ddb_entry->isid[0],
		sizeof(nt_ddb_idx->flash_isid));

		if (qla4xxx_is_flash_ddb_exists(ha, list_nt,
		fw_ddb_entry) == QLA_SUCCESS) {
		ret = qla4xxx_is_flash_ddb_exists(ha, list_nt,
		fw_ddb_entry);
		if (ret == QLA_SUCCESS) {
		/* free nt_ddb_idx and do not add to list_nt */
		vfree(nt_ddb_idx);
		goto continue_next_nt;
		}

		/* Copy updated isid */
		memcpy(&nt_ddb_idx->fw_ddb, fw_ddb_entry,
		sizeof(struct dev_db_entry));

		list_add_tail(&nt_ddb_idx->list, list_nt);
		} else if (is_reset == RESET_ADAPTER) {
		if (qla4xxx_is_session_exists(ha, fw_ddb_entry) ==