IB/qib: Add congestion control agent implementation
Add a congestion control agent in the driver that handles gets and
sets from the congestion control manager in the fabric for the
Performance Scale Messaging (PSM) library.
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/drivers/infiniband/hw/qib/qib.h b/drivers/infiniband/hw/qib/qib.h
index cbe5771..6e19ec8 100644
--- a/drivers/infiniband/hw/qib/qib.h
+++ b/drivers/infiniband/hw/qib/qib.h
@@ -519,6 +519,7 @@
struct qib_devdata *dd;
struct qib_chippport_specific *cpspec; /* chip-specific per-port */
struct kobject pport_kobj;
+ struct kobject pport_cc_kobj;
struct kobject sl2vl_kobj;
struct kobject diagc_kobj;
@@ -638,6 +639,39 @@
struct timer_list led_override_timer;
struct xmit_wait cong_stats;
struct timer_list symerr_clear_timer;
+
+ /* Synchronize access between driver writes and sysfs reads */
+ spinlock_t cc_shadow_lock
+ ____cacheline_aligned_in_smp;
+
+ /* Shadow copy of the congestion control table */
+ struct cc_table_shadow *ccti_entries_shadow;
+
+ /* Shadow copy of the congestion control entries */
+ struct ib_cc_congestion_setting_attr_shadow *congestion_entries_shadow;
+
+ /* List of congestion control table entries */
+ struct ib_cc_table_entry_shadow *ccti_entries;
+
+ /* 16 congestion entries with each entry corresponding to a SL */
+ struct ib_cc_congestion_entry_shadow *congestion_entries;
+
+ /* Total number of congestion control table entries */
+ u16 total_cct_entry;
+
+ /* Bit map identifying service level */
+ u16 cc_sl_control_map;
+
+ /* maximum congestion control table index */
+ u16 ccti_limit;
+
+ /* CA's max number of 64 entry units in the congestion control table */
+ u8 cc_max_table_entries;
+
+ /* Maximum number of congestion control entries that the agent expects
+ * the manager to send.
+ */
+ u8 cc_supported_table_entries;
};
/* Observers. Not to be taken lightly, possibly not to ship. */
@@ -1078,6 +1112,7 @@
extern unsigned long *qib_cpulist;
extern unsigned qib_wc_pat;
+extern unsigned qib_cc_table_size;
int qib_init(struct qib_devdata *, int);
int init_chip_wc_pat(struct qib_devdata *dd, u32);
int qib_enable_wc(struct qib_devdata *dd);