target/configfs: Expose protection device attributes
This patch adds support for exposing DIF protection device attributes via configfs. This includes: pi_prot_type: Protection Type (0, 1, 3 currently support) pi_prot_format: Protection Format Operation (FILEIO only) Within se_dev_set_pi_prot_type() it also adds the se_subsystem_api device callbacks to setup per device protection information. v2 changes: - Drop pi_guard_type + pi_prot_version related code (MKP) - Add pi_prot_format logic (Sagi) - Add ->free_prot callback in target_free_device - Add hw_pi_prot_type read-only attribute Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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@ -643,6 +643,15 @@ SE_DEV_ATTR(emulate_caw, S_IRUGO | S_IWUSR);
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DEF_DEV_ATTRIB(emulate_3pc);
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SE_DEV_ATTR(emulate_3pc, S_IRUGO | S_IWUSR);
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DEF_DEV_ATTRIB(pi_prot_type);
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SE_DEV_ATTR(pi_prot_type, S_IRUGO | S_IWUSR);
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DEF_DEV_ATTRIB_RO(hw_pi_prot_type);
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SE_DEV_ATTR_RO(hw_pi_prot_type);
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DEF_DEV_ATTRIB(pi_prot_format);
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SE_DEV_ATTR(pi_prot_format, S_IRUGO | S_IWUSR);
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DEF_DEV_ATTRIB(enforce_pr_isids);
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SE_DEV_ATTR(enforce_pr_isids, S_IRUGO | S_IWUSR);
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@ -702,6 +711,9 @@ static struct configfs_attribute *target_core_dev_attrib_attrs[] = {
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&target_core_dev_attrib_emulate_tpws.attr,
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&target_core_dev_attrib_emulate_caw.attr,
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&target_core_dev_attrib_emulate_3pc.attr,
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&target_core_dev_attrib_pi_prot_type.attr,
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&target_core_dev_attrib_hw_pi_prot_type.attr,
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&target_core_dev_attrib_pi_prot_format.attr,
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&target_core_dev_attrib_enforce_pr_isids.attr,
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&target_core_dev_attrib_is_nonrot.attr,
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&target_core_dev_attrib_emulate_rest_reord.attr,
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@ -918,6 +918,90 @@ int se_dev_set_emulate_3pc(struct se_device *dev, int flag)
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return 0;
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}
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int se_dev_set_pi_prot_type(struct se_device *dev, int flag)
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{
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int rc, old_prot = dev->dev_attrib.pi_prot_type;
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if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
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pr_err("Illegal value %d for pi_prot_type\n", flag);
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return -EINVAL;
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}
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if (flag == 2) {
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pr_err("DIF TYPE2 protection currently not supported\n");
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return -ENOSYS;
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}
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if (dev->dev_attrib.hw_pi_prot_type) {
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pr_warn("DIF protection enabled on underlying hardware,"
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" ignoring\n");
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return 0;
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}
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if (!dev->transport->init_prot || !dev->transport->free_prot) {
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pr_err("DIF protection not supported by backend: %s\n",
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dev->transport->name);
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return -ENOSYS;
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}
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if (!(dev->dev_flags & DF_CONFIGURED)) {
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pr_err("DIF protection requires device to be configured\n");
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return -ENODEV;
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}
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if (dev->export_count) {
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pr_err("dev[%p]: Unable to change SE Device PROT type while"
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" export_count is %d\n", dev, dev->export_count);
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return -EINVAL;
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}
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dev->dev_attrib.pi_prot_type = flag;
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if (flag && !old_prot) {
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rc = dev->transport->init_prot(dev);
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if (rc) {
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dev->dev_attrib.pi_prot_type = old_prot;
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return rc;
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}
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} else if (!flag && old_prot) {
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dev->transport->free_prot(dev);
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}
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pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
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return 0;
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}
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int se_dev_set_pi_prot_format(struct se_device *dev, int flag)
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{
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int rc;
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if (!flag)
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return 0;
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if (flag != 1) {
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pr_err("Illegal value %d for pi_prot_format\n", flag);
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return -EINVAL;
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}
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if (!dev->transport->format_prot) {
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pr_err("DIF protection format not supported by backend %s\n",
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dev->transport->name);
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return -ENOSYS;
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}
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if (!(dev->dev_flags & DF_CONFIGURED)) {
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pr_err("DIF protection format requires device to be configured\n");
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return -ENODEV;
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}
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if (dev->export_count) {
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pr_err("dev[%p]: Unable to format SE Device PROT type while"
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" export_count is %d\n", dev, dev->export_count);
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return -EINVAL;
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}
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rc = dev->transport->format_prot(dev);
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if (rc)
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return rc;
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pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
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return 0;
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}
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int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
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{
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if ((flag != 0) && (flag != 1)) {
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@ -1415,6 +1499,7 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
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dev->dev_link_magic = SE_DEV_LINK_MAGIC;
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dev->se_hba = hba;
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dev->transport = hba->transport;
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dev->prot_length = sizeof(struct se_dif_v1_tuple);
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INIT_LIST_HEAD(&dev->dev_list);
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INIT_LIST_HEAD(&dev->dev_sep_list);
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@ -1457,6 +1542,7 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
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dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
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dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
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dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
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dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
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dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
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dev->dev_attrib.is_nonrot = DA_IS_NONROT;
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dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
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@ -1589,6 +1675,9 @@ void target_free_device(struct se_device *dev)
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core_scsi3_free_all_registrations(dev);
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se_release_vpd_for_dev(dev);
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if (dev->transport->free_prot)
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dev->transport->free_prot(dev);
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dev->transport->free_device(dev);
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}
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@ -35,6 +35,8 @@ int se_dev_set_emulate_tpu(struct se_device *, int);
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int se_dev_set_emulate_tpws(struct se_device *, int);
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int se_dev_set_emulate_caw(struct se_device *, int);
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int se_dev_set_emulate_3pc(struct se_device *, int);
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int se_dev_set_pi_prot_type(struct se_device *, int);
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int se_dev_set_pi_prot_format(struct se_device *, int);
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int se_dev_set_enforce_pr_isids(struct se_device *, int);
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int se_dev_set_is_nonrot(struct se_device *, int);
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int se_dev_set_emulate_rest_reord(struct se_device *dev, int);
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