diff options
Diffstat (limited to 'drivers/target/target_core_alua.c')
| -rw-r--r-- | drivers/target/target_core_alua.c | 82 |
1 files changed, 70 insertions, 12 deletions
diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c index be7251ee8b3a..e624b836469c 100644 --- a/drivers/target/target_core_alua.c +++ b/drivers/target/target_core_alua.c @@ -66,18 +66,24 @@ int target_emulate_report_target_port_groups(struct se_cmd *cmd) struct t10_alua_tg_pt_gp *tg_pt_gp; struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; unsigned char *buf; - u32 rd_len = 0, off = 4; /* Skip over RESERVED area to first - Target port group descriptor */ + u32 rd_len = 0, off; + int ext_hdr = (cmd->t_task_cdb[1] & 0x20); /* - * Need at least 4 bytes of response data or else we can't - * even fit the return data length. + * Skip over RESERVED area to first Target port group descriptor + * depending on the PARAMETER DATA FORMAT type.. */ - if (cmd->data_length < 4) { - pr_warn("REPORT TARGET PORT GROUPS allocation length %u" - " too small\n", cmd->data_length); + if (ext_hdr != 0) + off = 8; + else + off = 4; + + if (cmd->data_length < off) { + pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" + " small for %s header\n", cmd->data_length, + (ext_hdr) ? "extended" : "normal"); + cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; return -EINVAL; } - buf = transport_kmap_data_sg(cmd); spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); @@ -158,11 +164,31 @@ int target_emulate_report_target_port_groups(struct se_cmd *cmd) /* * Set the RETURN DATA LENGTH set in the header of the DataIN Payload */ - buf[0] = ((rd_len >> 24) & 0xff); - buf[1] = ((rd_len >> 16) & 0xff); - buf[2] = ((rd_len >> 8) & 0xff); - buf[3] = (rd_len & 0xff); + put_unaligned_be32(rd_len, &buf[0]); + /* + * Fill in the Extended header parameter data format if requested + */ + if (ext_hdr != 0) { + buf[4] = 0x10; + /* + * Set the implict transition time (in seconds) for the application + * client to use as a base for it's transition timeout value. + * + * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN + * this CDB was received upon to determine this value individually + * for ALUA target port group. + */ + port = cmd->se_lun->lun_sep; + tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; + if (tg_pt_gp_mem) { + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; + if (tg_pt_gp) + buf[5] = tg_pt_gp->tg_pt_gp_implict_trans_secs; + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + } + } transport_kunmap_data_sg(cmd); target_complete_cmd(cmd, GOOD); @@ -1355,6 +1381,7 @@ struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp( */ tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; + tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS; if (def_group) { spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); @@ -1851,6 +1878,37 @@ ssize_t core_alua_store_trans_delay_msecs( return count; } +ssize_t core_alua_show_implict_trans_secs( + struct t10_alua_tg_pt_gp *tg_pt_gp, + char *page) +{ + return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs); +} + +ssize_t core_alua_store_implict_trans_secs( + struct t10_alua_tg_pt_gp *tg_pt_gp, + const char *page, + size_t count) +{ + unsigned long tmp; + int ret; + + ret = strict_strtoul(page, 0, &tmp); + if (ret < 0) { + pr_err("Unable to extract implict_trans_secs\n"); + return -EINVAL; + } + if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) { + pr_err("Passed implict_trans_secs: %lu, exceeds" + " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp, + ALUA_MAX_IMPLICT_TRANS_SECS); + return -EINVAL; + } + tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp; + + return count; +} + ssize_t core_alua_show_preferred_bit( struct t10_alua_tg_pt_gp *tg_pt_gp, char *page) |