From: Chad Dupuis <chad.dupuis@cavium.com>
Date: Wed, 25 Apr 2018 06:08:52 -0700
Subject: scsi: qedf: Honor priority from DCBX FCoE App tag
Git-commit: 84b2ba6e427ce57408052bde987260c022aff96c
Patch-mainline: v4.18-rc1
References: bsc#1086317
We currently hard code the priority in the 8021q tag to 3 for FCoE
traffic. The vast majority of the time this is fine but if the priority
is something else besides 3, any VLAN ID comparison either in the
non-offload path or offload path will fail and cause dropped frames
where none are expected.
Change the behavior so that the driver default is 3 if we do not get any
DCBX convergence.
If DCBX does converge, then set the FIP/FCoE priority in the following
manner:
1. If the qedf_default_prio modparam is set use that
2. If the DCBX FCoE priority is not in range (0..7) use 3
3. Use the DCBX FCoE priority we get in the driver's DCBX handler
Signed-off-by: Chad Dupuis <chad.dupuis@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Lee Duncan <lduncan@suse.com>
---
drivers/scsi/qedf/qedf.h | 1
drivers/scsi/qedf/qedf_main.c | 52 ++++++++++++++++++++++++++++++------------
2 files changed, 39 insertions(+), 14 deletions(-)
--- a/drivers/scsi/qedf/qedf.h
+++ b/drivers/scsi/qedf/qedf.h
@@ -301,6 +301,7 @@ struct qedf_ctx {
#define QEDF_FALLBACK_VLAN 1002
#define QEDF_DEFAULT_PRIO 3
int vlan_id;
+ u8 prio;
struct qed_dev *cdev;
struct qed_dev_fcoe_info dev_info;
struct qed_int_info int_info;
--- a/drivers/scsi/qedf/qedf_main.c
+++ b/drivers/scsi/qedf/qedf_main.c
@@ -54,10 +54,10 @@ module_param_named(fallback_vlan, qedf_fallback_vlan, int, S_IRUGO);
MODULE_PARM_DESC(fallback_vlan, " VLAN ID to try if fip vlan request fails "
"(default 1002).");
-static uint qedf_default_prio = QEDF_DEFAULT_PRIO;
+static int qedf_default_prio = -1;
module_param_named(default_prio, qedf_default_prio, int, S_IRUGO);
-MODULE_PARM_DESC(default_prio, " Default 802.1q priority for FIP and FCoE"
- " traffic (default 3).");
+MODULE_PARM_DESC(default_prio, " Override 802.1q priority for FIP and FCoE"
+ " traffic (value between 0 and 7, default 3).");
uint qedf_dump_frames;
module_param_named(dump_frames, qedf_dump_frames, int, S_IRUGO | S_IWUSR);
@@ -114,9 +114,9 @@ static struct kmem_cache *qedf_io_work_cache;
void qedf_set_vlan_id(struct qedf_ctx *qedf, int vlan_id)
{
qedf->vlan_id = vlan_id;
- qedf->vlan_id |= qedf_default_prio << VLAN_PRIO_SHIFT;
+ qedf->vlan_id |= qedf->prio << VLAN_PRIO_SHIFT;
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Setting vlan_id=%04x "
- "prio=%d.\n", vlan_id, qedf_default_prio);
+ "prio=%d.\n", vlan_id, qedf->prio);
}
/* Returns true if we have a valid vlan, false otherwise */
@@ -521,7 +521,7 @@ static void qedf_link_update(void *dev, struct qed_link_output *link)
"Starting link down tmo.\n");
atomic_set(&qedf->link_down_tmo_valid, 1);
}
- qedf->vlan_id = 0;
+ qedf->vlan_id = 0;
qedf_update_link_speed(qedf, link);
queue_delayed_work(qedf->link_update_wq, &qedf->link_update,
qedf_link_down_tmo * HZ);
@@ -532,6 +532,7 @@ static void qedf_link_update(void *dev, struct qed_link_output *link)
static void qedf_dcbx_handler(void *dev, struct qed_dcbx_get *get, u32 mib_type)
{
struct qedf_ctx *qedf = (struct qedf_ctx *)dev;
+ u8 tmp_prio;
QEDF_ERR(&(qedf->dbg_ctx), "DCBx event valid=%d enabled=%d fcoe "
"prio=%d.\n", get->operational.valid, get->operational.enabled,
@@ -547,6 +548,24 @@ static void qedf_dcbx_handler(void *dev, struct qed_dcbx_get *get, u32 mib_type)
atomic_set(&qedf->dcbx, QEDF_DCBX_DONE);
+ /*
+ * Set the 8021q priority in the following manner:
+ *
+ * 1. If a modparam is set use that
+ * 2. If the value is not between 0..7 use the default
+ * 3. Use the priority we get from the DCBX app tag
+ */
+ tmp_prio = get->operational.app_prio.fcoe;
+ if (qedf_default_prio > -1)
+ qedf->prio = qedf_default_prio;
+ else if (tmp_prio < 0 || tmp_prio > 7) {
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
+ "FIP/FCoE prio %d out of range, setting to %d.\n",
+ tmp_prio, QEDF_DEFAULT_PRIO);
+ qedf->prio = QEDF_DEFAULT_PRIO;
+ } else
+ qedf->prio = tmp_prio;
+
if (atomic_read(&qedf->link_state) == QEDF_LINK_UP &&
!qedf_dcbx_no_wait) {
if (atomic_read(&qedf->link_down_tmo_valid) > 0)
@@ -1114,7 +1133,7 @@ static int qedf_offload_connection(struct qedf_ctx *qedf,
conn_info.vlan_tag = qedf->vlan_id <<
FCOE_CONN_OFFLOAD_RAMROD_DATA_VLAN_ID_SHIFT;
conn_info.vlan_tag |=
- qedf_default_prio << FCOE_CONN_OFFLOAD_RAMROD_DATA_PRIORITY_SHIFT;
+ qedf->prio << FCOE_CONN_OFFLOAD_RAMROD_DATA_PRIORITY_SHIFT;
conn_info.flags |= (FCOE_CONN_OFFLOAD_RAMROD_DATA_B_VLAN_FLAG_MASK <<
FCOE_CONN_OFFLOAD_RAMROD_DATA_B_VLAN_FLAG_SHIFT);
@@ -2985,8 +3004,9 @@ static int __qedf_probe(struct pci_dev *pdev, int mode)
qedf->link_update_wq = create_workqueue(host_buf);
INIT_DELAYED_WORK(&qedf->link_update, qedf_handle_link_update);
INIT_DELAYED_WORK(&qedf->link_recovery, qedf_link_recovery);
-
qedf->fipvlan_retries = qedf_fipvlan_retries;
+ /* Set a default prio in case DCBX doesn't converge */
+ qedf->prio = QEDF_DEFAULT_PRIO;
/*
* Common probe. Takes care of basic hardware init and pci_*
@@ -3412,12 +3432,16 @@ static int __init qedf_init(void)
if (qedf_debug == QEDF_LOG_DEFAULT)
qedf_debug = QEDF_DEFAULT_LOG_MASK;
- /* Check that default prio for FIP/FCoE traffic is between 0..7 */
- if (qedf_default_prio > 7) {
- qedf_default_prio = QEDF_DEFAULT_PRIO;
- QEDF_ERR(NULL, "FCoE/FIP priority out of range, resetting to %d.\n",
- QEDF_DEFAULT_PRIO);
- }
+ /*
+ * Check that default prio for FIP/FCoE traffic is between 0..7 if a
+ * value has been set
+ */
+ if (qedf_default_prio > -1)
+ if (qedf_default_prio > 7) {
+ qedf_default_prio = QEDF_DEFAULT_PRIO;
+ QEDF_ERR(NULL, "FCoE/FIP priority out of range, resetting to %d.\n",
+ QEDF_DEFAULT_PRIO);
+ }
/* Print driver banner */
QEDF_INFO(NULL, QEDF_LOG_INFO, "%s v%s.\n", QEDF_DESCR,