target: Add MI_REPORT_TARGET_PGS ext. header + implict_trans_secs attribute

This patch adds support for ALUA MI_REPORT_TARGET_PGS extended header
format defined within SPC-4.  It changes target core ALUA emulation logic
within target_emulate_report_target_port_groups() to support both the
extended and original length only header formats.

It includes adding a new 'implict_trans_secs' attribute for each ALUA
target port group to control the value returned to the application client
for an recommended implict translation timeout in seconds.  By default
this value is currently set to zero, and limited up to 255 by virtue of
using a single byte in the extended header format.

This value is used by target_emulate_report_target_port_groups() within
the extended header logic to set IMPLICIT TRANSITION TIME as defined by
spc4r30.

Cc: Hannes Reinecke <hare@suse.de>
Cc: Rob Evers <revers@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 70 insertions, 12 deletions

diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index be7251ee8b3..e624b836469 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)