sfc: add hashtables for MAE counters and counter ID mappings

Nothing populates them yet.
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/tc.c

@@ -752,6 +752,9 @@ int efx_init_struct_tc(struct efx_nic *efx)
 
 	mutex_init(&efx->tc->mutex);
 	init_waitqueue_head(&efx->tc->flush_wq);
+	rc = efx_tc_init_counters(efx);
+	if (rc < 0)
+		goto fail_counters;
 	rc = rhashtable_init(&efx->tc->match_action_ht, &efx_tc_match_action_ht_params);
 	if (rc < 0)
 		goto fail_match_action_ht;
@@ -764,6 +767,8 @@ int efx_init_struct_tc(struct efx_nic *efx)
 	efx->extra_channel_type[EFX_EXTRA_CHANNEL_TC] = &efx_tc_channel_type;
 	return 0;
 fail_match_action_ht:
+	efx_tc_destroy_counters(efx);
+fail_counters:
 	mutex_destroy(&efx->tc->mutex);
 	kfree(efx->tc->caps);
 fail_alloc_caps:
@@ -784,6 +789,7 @@ void efx_fini_struct_tc(struct efx_nic *efx)
 			     MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL);
 	rhashtable_free_and_destroy(&efx->tc->match_action_ht, efx_tc_flow_free,
 				    efx);
+	efx_tc_fini_counters(efx);
 	mutex_unlock(&efx->tc->mutex);
 	mutex_destroy(&efx->tc->mutex);
 	kfree(efx->tc->caps);

drivers/net/ethernet/sfc/tc.h

@@ -75,6 +75,8 @@ enum efx_tc_rule_prios {
  * @caps: MAE capabilities reported by MCDI
  * @block_list: List of &struct efx_tc_block_binding
  * @mutex: Used to serialise operations on TC hashtables
+ * @counter_ht: Hashtable of TC counters (FW IDs and counter values)
+ * @counter_id_ht: Hashtable mapping TC counter cookies to counters
  * @match_action_ht: Hashtable of TC match-action rules
  * @reps_mport_id: MAE port allocated for representor RX
  * @reps_filter_uc: VNIC filter for representor unicast RX (promisc)
@@ -96,6 +98,8 @@ struct efx_tc_state {
 	struct mae_caps *caps;
 	struct list_head block_list;
 	struct mutex mutex;
+	struct rhashtable counter_ht;
+	struct rhashtable counter_id_ht;
 	struct rhashtable match_action_ht;
 	u32 reps_mport_id, reps_mport_vport_id;
 	s32 reps_filter_uc, reps_filter_mc;

drivers/net/ethernet/sfc/tc_counters.c

@@ -13,6 +13,67 @@
 #include "mae.h"
 #include "rx_common.h"
 
+/* Counter-management hashtables */
+
+static const struct rhashtable_params efx_tc_counter_id_ht_params = {
+	.key_len	= offsetof(struct efx_tc_counter_index, linkage),
+	.key_offset	= 0,
+	.head_offset	= offsetof(struct efx_tc_counter_index, linkage),
+};
+
+static const struct rhashtable_params efx_tc_counter_ht_params = {
+	.key_len	= offsetof(struct efx_tc_counter, linkage),
+	.key_offset	= 0,
+	.head_offset	= offsetof(struct efx_tc_counter, linkage),
+};
+
+static void efx_tc_counter_free(void *ptr, void *__unused)
+{
+	struct efx_tc_counter *cnt = ptr;
+
+	kfree(cnt);
+}
+
+static void efx_tc_counter_id_free(void *ptr, void *__unused)
+{
+	struct efx_tc_counter_index *ctr = ptr;
+
+	WARN_ON(refcount_read(&ctr->ref));
+	kfree(ctr);
+}
+
+int efx_tc_init_counters(struct efx_nic *efx)
+{
+	int rc;
+
+	rc = rhashtable_init(&efx->tc->counter_id_ht, &efx_tc_counter_id_ht_params);
+	if (rc < 0)
+		goto fail_counter_id_ht;
+	rc = rhashtable_init(&efx->tc->counter_ht, &efx_tc_counter_ht_params);
+	if (rc < 0)
+		goto fail_counter_ht;
+	return 0;
+fail_counter_ht:
+	rhashtable_destroy(&efx->tc->counter_id_ht);
+fail_counter_id_ht:
+	return rc;
+}
+
+/* Only call this in init failure teardown.
+ * Normal exit should fini instead as there may be entries in the table.
+ */
+void efx_tc_destroy_counters(struct efx_nic *efx)
+{
+	rhashtable_destroy(&efx->tc->counter_ht);
+	rhashtable_destroy(&efx->tc->counter_id_ht);
+}
+
+void efx_tc_fini_counters(struct efx_nic *efx)
+{
+	rhashtable_free_and_destroy(&efx->tc->counter_id_ht, efx_tc_counter_id_free, NULL);
+	rhashtable_free_and_destroy(&efx->tc->counter_ht, efx_tc_counter_free, NULL);
+}
+
 /* TC Channel.  Counter updates are delivered on this channel's RXQ. */
 
 static void efx_tc_handle_no_channel(struct efx_nic *efx)

drivers/net/ethernet/sfc/tc_counters.h

@@ -10,6 +10,7 @@
 
 #ifndef EFX_TC_COUNTERS_H
 #define EFX_TC_COUNTERS_H
+#include <linux/refcount.h>
 #include "net_driver.h"
 
 #include "mcdi_pcol.h" /* for MAE_COUNTER_TYPE_* */
@@ -21,6 +22,24 @@ enum efx_tc_counter_type {
 	EFX_TC_COUNTER_TYPE_MAX
 };
 
+struct efx_tc_counter {
+	u32 fw_id; /* index in firmware counter table */
+	enum efx_tc_counter_type type;
+	struct rhash_head linkage; /* efx->tc->counter_ht */
+};
+
+struct efx_tc_counter_index {
+	unsigned long cookie;
+	struct rhash_head linkage; /* efx->tc->counter_id_ht */
+	refcount_t ref;
+	struct efx_tc_counter *cnt;
+};
+
+/* create/uncreate/teardown hashtables */
+int efx_tc_init_counters(struct efx_nic *efx);
+void efx_tc_destroy_counters(struct efx_nic *efx);
+void efx_tc_fini_counters(struct efx_nic *efx);
+
 extern const struct efx_channel_type efx_tc_channel_type;
 
 #endif /* EFX_TC_COUNTERS_H */