nfp: flower: support multiple memory units for filter offloads

Adds support for multiple memory units which are used for filter
offloads. Each filter is assigned a stats id, the MSBs of the id are
used to determine which memory unit the filter should be offloaded
to. The number of available memory units that could be used for filter
offload is obtained from HW. A simple round robin technique is used to
allocate and distribute the ids across memory units.

Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 20 insertions, 7 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/flower/metadata.c b/drivers/net/ethernet/netronome/nfp/flower/metadata.c
index 573a4400a26c..492837b852b6 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/metadata.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/metadata.c
@@ -4,6 +4,7 @@
 #include <linux/hash.h>
 #include <linux/hashtable.h>
 #include <linux/jhash.h>
+#include <linux/math64.h>
 #include <linux/vmalloc.h>
 #include <net/pkt_cls.h>
 
@@ -52,8 +53,17 @@ static int nfp_get_stats_entry(struct nfp_app *app, u32 *stats_context_id)
 	freed_stats_id = priv->stats_ring_size;
 	/* Check for unallocated entries first. */
 	if (priv->stats_ids.init_unalloc > 0) {
-		*stats_context_id = priv->stats_ids.init_unalloc - 1;
-		priv->stats_ids.init_unalloc--;
+		if (priv->active_mem_unit == priv->total_mem_units) {
+			priv->stats_ids.init_unalloc--;
+			priv->active_mem_unit = 0;
+		}
+
+		*stats_context_id =
+			FIELD_PREP(NFP_FL_STAT_ID_STAT,
+				   priv->stats_ids.init_unalloc - 1) |
+			FIELD_PREP(NFP_FL_STAT_ID_MU_NUM,
+				   priv->active_mem_unit);
+		priv->active_mem_unit++;
 		return 0;
 	}
 
@@ -381,10 +391,11 @@ const struct rhashtable_params nfp_flower_table_params = {
 	.automatic_shrinking	= true,
 };
 
-int nfp_flower_metadata_init(struct nfp_app *app, u64 host_ctx_count)
+int nfp_flower_metadata_init(struct nfp_app *app, u64 host_ctx_count,
+			     unsigned int host_num_mems)
 {
 	struct nfp_flower_priv *priv = app->priv;
-	int err;
+	int err, stats_size;
 
 	hash_init(priv->mask_table);
 
@@ -417,10 +428,12 @@ int nfp_flower_metadata_init(struct nfp_app *app, u64 host_ctx_count)
 	if (!priv->stats_ids.free_list.buf)
 		goto err_free_last_used;
 
-	priv->stats_ids.init_unalloc = host_ctx_count;
+	priv->stats_ids.init_unalloc = div_u64(host_ctx_count, host_num_mems);
 
-	priv->stats = kvmalloc_array(priv->stats_ring_size,
-				     sizeof(struct nfp_fl_stats), GFP_KERNEL);
+	stats_size = FIELD_PREP(NFP_FL_STAT_ID_STAT, host_ctx_count) |
+		     FIELD_PREP(NFP_FL_STAT_ID_MU_NUM, host_num_mems - 1);
+	priv->stats = kvmalloc_array(stats_size, sizeof(struct nfp_fl_stats),
+				     GFP_KERNEL);
 	if (!priv->stats)
 		goto err_free_ring_buf;