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target/user: Only support full command pass-through
After much discussion, give up on only passing a subset of SCSI commands to userspace and pass them all. Based on what pscsi is doing, make sure to set SCF_SCSI_DATA_CDB for I/O ops, and define attributes identical to pscsi. Make hw_block_size configurable via dev param. Remove mention of command filtering from tcmu-design.txt. Signed-off-by: Andy Grover <agrover@redhat.com> Reviewed-by: Ilias Tsitsimpis <iliastsi@arrikto.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Andy Grover
Nicholas Bellinger
parent
cf87edc602
commit
9c1cd1b68c
@ -15,8 +15,7 @@ Contents:
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a) Discovering and configuring TCMU uio devices
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b) Waiting for events on the device(s)
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c) Managing the command ring
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3) Command filtering
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4) A final note
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3) A final note
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TCM Userspace Design
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@ -364,24 +363,6 @@ int handle_device_events(int fd, void *map)
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}
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Command filtering
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-----------------
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Initial TCMU support is for a filtered commandset. Only IO-related
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commands are presented to userspace, and the rest are handled by LIO's
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in-kernel command emulation. The commands presented are all versions
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of:
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READ
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WRITE
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WRITE_VERIFY
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XDWRITEREAD
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WRITE_SAME
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COMPARE_AND_WRITE
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SYNCHRONIZE_CACHE
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UNMAP
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A final note
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------------
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@ -938,12 +938,13 @@ static void tcmu_free_device(struct se_device *dev)
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}
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enum {
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Opt_dev_config, Opt_dev_size, Opt_err,
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Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_err,
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};
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static match_table_t tokens = {
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{Opt_dev_config, "dev_config=%s"},
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{Opt_dev_size, "dev_size=%u"},
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{Opt_hw_block_size, "hw_block_size=%u"},
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{Opt_err, NULL}
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};
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@ -954,6 +955,7 @@ static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev,
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char *orig, *ptr, *opts, *arg_p;
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substring_t args[MAX_OPT_ARGS];
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int ret = 0, token;
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unsigned long tmp_ul;
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opts = kstrdup(page, GFP_KERNEL);
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if (!opts)
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@ -986,6 +988,24 @@ static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev,
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if (ret < 0)
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pr_err("kstrtoul() failed for dev_size=\n");
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break;
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case Opt_hw_block_size:
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arg_p = match_strdup(&args[0]);
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if (!arg_p) {
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ret = -ENOMEM;
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break;
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}
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ret = kstrtoul(arg_p, 0, &tmp_ul);
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kfree(arg_p);
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if (ret < 0) {
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pr_err("kstrtoul() failed for hw_block_size=\n");
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break;
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}
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if (!tmp_ul) {
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pr_err("hw_block_size must be nonzero\n");
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break;
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}
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dev->dev_attrib.hw_block_size = tmp_ul;
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break;
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default:
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break;
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}
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@ -1015,20 +1035,6 @@ static sector_t tcmu_get_blocks(struct se_device *dev)
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dev->dev_attrib.block_size);
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}
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static sense_reason_t
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tcmu_execute_rw(struct se_cmd *se_cmd, struct scatterlist *sgl, u32 sgl_nents,
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enum dma_data_direction data_direction)
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{
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int ret;
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ret = tcmu_queue_cmd(se_cmd);
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if (ret != 0)
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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else
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return TCM_NO_SENSE;
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}
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static sense_reason_t
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tcmu_pass_op(struct se_cmd *se_cmd)
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{
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@ -1040,52 +1046,70 @@ tcmu_pass_op(struct se_cmd *se_cmd)
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return TCM_NO_SENSE;
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}
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static struct sbc_ops tcmu_sbc_ops = {
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.execute_rw = tcmu_execute_rw,
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.execute_sync_cache = tcmu_pass_op,
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.execute_write_same = tcmu_pass_op,
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.execute_write_same_unmap = tcmu_pass_op,
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.execute_unmap = tcmu_pass_op,
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};
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static sense_reason_t
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tcmu_parse_cdb(struct se_cmd *cmd)
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{
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return sbc_parse_cdb(cmd, &tcmu_sbc_ops);
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unsigned char *cdb = cmd->t_task_cdb;
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/*
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* For REPORT LUNS we always need to emulate the response, for everything
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* else, pass it up.
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*/
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if (cdb[0] == REPORT_LUNS) {
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cmd->execute_cmd = spc_emulate_report_luns;
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return TCM_NO_SENSE;
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}
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/* Set DATA_CDB flag for ops that should have it */
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switch (cdb[0]) {
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case READ_6:
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case READ_10:
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case READ_12:
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case READ_16:
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case WRITE_6:
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case WRITE_10:
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case WRITE_12:
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case WRITE_16:
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case WRITE_VERIFY:
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case WRITE_VERIFY_12:
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case 0x8e: /* WRITE_VERIFY_16 */
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case COMPARE_AND_WRITE:
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case XDWRITEREAD_10:
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cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
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break;
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case VARIABLE_LENGTH_CMD:
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switch (get_unaligned_be16(&cdb[8])) {
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case READ_32:
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case WRITE_32:
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case 0x0c: /* WRITE_VERIFY_32 */
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case XDWRITEREAD_32:
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cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
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break;
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}
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}
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cmd->execute_cmd = tcmu_pass_op;
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return TCM_NO_SENSE;
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}
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DEF_TB_DEFAULT_ATTRIBS(tcmu);
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DEF_TB_DEV_ATTRIB_RO(tcmu, hw_pi_prot_type);
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TB_DEV_ATTR_RO(tcmu, hw_pi_prot_type);
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DEF_TB_DEV_ATTRIB_RO(tcmu, hw_block_size);
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TB_DEV_ATTR_RO(tcmu, hw_block_size);
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DEF_TB_DEV_ATTRIB_RO(tcmu, hw_max_sectors);
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TB_DEV_ATTR_RO(tcmu, hw_max_sectors);
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DEF_TB_DEV_ATTRIB_RO(tcmu, hw_queue_depth);
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TB_DEV_ATTR_RO(tcmu, hw_queue_depth);
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static struct configfs_attribute *tcmu_backend_dev_attrs[] = {
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&tcmu_dev_attrib_emulate_model_alias.attr,
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&tcmu_dev_attrib_emulate_dpo.attr,
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&tcmu_dev_attrib_emulate_fua_write.attr,
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&tcmu_dev_attrib_emulate_fua_read.attr,
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&tcmu_dev_attrib_emulate_write_cache.attr,
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&tcmu_dev_attrib_emulate_ua_intlck_ctrl.attr,
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&tcmu_dev_attrib_emulate_tas.attr,
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&tcmu_dev_attrib_emulate_tpu.attr,
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&tcmu_dev_attrib_emulate_tpws.attr,
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&tcmu_dev_attrib_emulate_caw.attr,
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&tcmu_dev_attrib_emulate_3pc.attr,
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&tcmu_dev_attrib_pi_prot_type.attr,
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&tcmu_dev_attrib_hw_pi_prot_type.attr,
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&tcmu_dev_attrib_pi_prot_format.attr,
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&tcmu_dev_attrib_enforce_pr_isids.attr,
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&tcmu_dev_attrib_is_nonrot.attr,
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&tcmu_dev_attrib_emulate_rest_reord.attr,
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&tcmu_dev_attrib_force_pr_aptpl.attr,
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&tcmu_dev_attrib_hw_block_size.attr,
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&tcmu_dev_attrib_block_size.attr,
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&tcmu_dev_attrib_hw_max_sectors.attr,
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&tcmu_dev_attrib_optimal_sectors.attr,
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&tcmu_dev_attrib_hw_queue_depth.attr,
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&tcmu_dev_attrib_queue_depth.attr,
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&tcmu_dev_attrib_max_unmap_lba_count.attr,
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&tcmu_dev_attrib_max_unmap_block_desc_count.attr,
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&tcmu_dev_attrib_unmap_granularity.attr,
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&tcmu_dev_attrib_unmap_granularity_alignment.attr,
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&tcmu_dev_attrib_max_write_same_len.attr,
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NULL,
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};
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@ -1094,7 +1118,7 @@ static struct se_subsystem_api tcmu_template = {
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.inquiry_prod = "USER",
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.inquiry_rev = TCMU_VERSION,
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.owner = THIS_MODULE,
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.transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
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.transport_type = TRANSPORT_PLUGIN_PHBA_PDEV,
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.attach_hba = tcmu_attach_hba,
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.detach_hba = tcmu_detach_hba,
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.alloc_device = tcmu_alloc_device,
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