From: "Matthew R. Ochs" <mrochs@linux.vnet.ibm.com>
Date: Wed, 25 Oct 2017 16:36:20 -0500
Subject: [PATCH] scsi: cxlflash: Allow cards without WWPN VPD to configure
References: bsc#1077989
Git-commit: 0d4191305e69e42b3f7f11bbcf077d1d42929f94
Patch-mainline: v4.15-rc1
Currently, all adapters that cxlflash supports must have WWPN VPD
keywords to complete configuration. This was required as cards with
external FC ports needed to be programmed with WWPNs.
Newer supported cards do not have an external FC interface and therefore
do not require WWPN. To support backwards compatibility, these devices
have included 'dummy' WWPN VPD with WWPN values of zero. This however
places a dependency that all future cards have WWPN VPD, which may not
always be the case.
Allow for cards to not have WWPN, designating which cards are expected
to have it in order to configure properly.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
drivers/scsi/cxlflash/main.c | 24 +++++++++++++++++-------
drivers/scsi/cxlflash/main.h | 3 ++-
2 files changed, 19 insertions(+), 8 deletions(-)
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 8f609ef9282a..48d366304582 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -1635,7 +1635,10 @@ static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[])
ssize_t vpd_size;
char vpd_data[CXLFLASH_VPD_LEN];
char tmp_buf[WWPN_BUF_LEN] = { 0 };
- char *wwpn_vpd_tags[MAX_FC_PORTS] = { "V5", "V6", "V7", "V8" };
+ const struct dev_dependent_vals *ddv = (struct dev_dependent_vals *)
+ cfg->dev_id->driver_data;
+ const bool wwpn_vpd_required = ddv->flags & CXLFLASH_WWPN_VPD_REQUIRED;
+ const char *wwpn_vpd_tags[MAX_FC_PORTS] = { "V5", "V6", "V7", "V8" };
/* Get the VPD data from the device */
vpd_size = cxl_read_adapter_vpd(pdev, vpd_data, sizeof(vpd_data));
@@ -1672,17 +1675,24 @@ static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[])
* value. Note that we must copy to a temporary buffer
* because the conversion service requires that the ASCII
* string be terminated.
+ *
+ * Allow for WWPN not being found for all devices, setting
+ * the returned WWPN to zero when not found. Notify with a
+ * log error for cards that should have had WWPN keywords
+ * in the VPD - cards requiring WWPN will not have their
+ * ports programmed and operate in an undefined state.
*/
for (k = 0; k < cfg->num_fc_ports; k++) {
j = ro_size;
i = ro_start + PCI_VPD_LRDT_TAG_SIZE;
i = pci_vpd_find_info_keyword(vpd_data, i, j, wwpn_vpd_tags[k]);
- if (unlikely(i < 0)) {
- dev_err(dev, "%s: Port %d WWPN not found in VPD\n",
- __func__, k);
- rc = -ENODEV;
- goto out;
+ if (i < 0) {
+ if (wwpn_vpd_required)
+ dev_err(dev, "%s: Port %d WWPN not found\n",
+ __func__, k);
+ wwpn[k] = 0ULL;
+ continue;
}
j = pci_vpd_info_field_size(&vpd_data[i]);
@@ -3146,7 +3156,7 @@ static struct scsi_host_template driver_template = {
* Device dependent values
*/
static struct dev_dependent_vals dev_corsa_vals = { CXLFLASH_MAX_SECTORS,
- 0ULL };
+ CXLFLASH_WWPN_VPD_REQUIRED };
static struct dev_dependent_vals dev_flash_gt_vals = { CXLFLASH_MAX_SECTORS,
CXLFLASH_NOTIFY_SHUTDOWN };
static struct dev_dependent_vals dev_briard_vals = { CXLFLASH_MAX_SECTORS,
diff --git a/drivers/scsi/cxlflash/main.h b/drivers/scsi/cxlflash/main.h
index 880e348ed5c9..ba0108a7a9c2 100644
--- a/drivers/scsi/cxlflash/main.h
+++ b/drivers/scsi/cxlflash/main.h
@@ -95,7 +95,8 @@ enum undo_level {
struct dev_dependent_vals {
u64 max_sectors;
u64 flags;
-#define CXLFLASH_NOTIFY_SHUTDOWN 0x0000000000000001ULL
+#define CXLFLASH_NOTIFY_SHUTDOWN 0x0000000000000001ULL
+#define CXLFLASH_WWPN_VPD_REQUIRED 0x0000000000000002ULL
};
struct asyc_intr_info {
--
2.12.3