net: ipa: support more filtering endpoints

Prior to IPA v5.0, there could be no more than 32 endpoints.

A filter table begins with a bitmap indicating which endpoints have
a filter defined. That bitmap is currently assumed to fit in a
32-bit value.

Starting with IPA v5.0, more than 32 endpoints are supported, so
it's conceivable that a TX endpoint has an ID that exceeds 32.
Increase the size of the field representing endpoints that support
filtering to 64 bits. Rename the bitmap field "filtered".

Unlike other similar fields, we do not use an (arbitrarily long)
Linux bitmap for this purpose. The reason is that if a filter table
ever *did* need to support more than 64 TX endpoints, its format
would change in ways we can't anticipate.

Have ipa_endpoint_init() return a negative errno rather than a mask
that indicates which endpoints support filtering, and have that
function assign the "filtered" field directly.

Signed-off-by: Alex Elder <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ipa/ipa.h

···
  * @available_count:	Number of defined bits in the available bitmap
  * @defined:		Bitmap of endpoints defined in config data
  * @available:		Bitmap of endpoints supported by hardware
- * @filter_map:		Bit mask indicating endpoints that support filtering
+ * @filtered:		Bitmap of endpoints that support filtering
  * @set_up:		Bit mask indicating endpoints set up
  * @enabled:		Bit mask indicating endpoints enabled
  * @modem_tx_count:	Number of defined modem TX endoints
···
 	u32 available_count;
 	unsigned long *defined;		/* Defined in configuration data */
 	unsigned long *available;	/* Supported by hardware */
-	u32 filter_map;
+	u64 filtered;			/* Support filtering (AP and modem) */
 	u32 set_up;
 	u32 enabled;
 

drivers/net/ipa/ipa_endpoint.c

···
 {
 	u32 endpoint_id;
 
+	ipa->filtered = 0;
+
 	for_each_set_bit(endpoint_id, ipa->defined, ipa->endpoint_count)
 		ipa_endpoint_exit_one(&ipa->endpoint[endpoint_id]);
 
···
 }
 
 /* Returns a bitmask of endpoints that support filtering, or 0 on error */
-u32 ipa_endpoint_init(struct ipa *ipa, u32 count,
+int ipa_endpoint_init(struct ipa *ipa, u32 count,
 		      const struct ipa_gsi_endpoint_data *data)
 {
 	enum ipa_endpoint_name name;
-	u32 filter_map;
+	u32 filtered;
 
 	BUILD_BUG_ON(!IPA_REPLENISH_BATCH);
 
 	/* Number of endpoints is one more than the maximum ID */
 	ipa->endpoint_count = ipa_endpoint_max(ipa, count, data) + 1;
 	if (!ipa->endpoint_count)
-		return 0;	/* Error */
+		return -EINVAL;
 
 	/* Initialize the defined endpoint bitmap */
 	ipa->defined = bitmap_zalloc(ipa->endpoint_count, GFP_KERNEL);
 	if (!ipa->defined)
-		return 0;	/* Error */
+		return -ENOMEM;
 
-	filter_map = 0;
+	filtered = 0;
 	for (name = 0; name < count; name++, data++) {
 		if (ipa_gsi_endpoint_data_empty(data))
 			continue;	/* Skip over empty slots */
···
 		ipa_endpoint_init_one(ipa, name, data);
 
 		if (data->endpoint.filter_support)
-			filter_map |= BIT(data->endpoint_id);
+			filtered |= BIT(data->endpoint_id);
 		if (data->ee_id == GSI_EE_MODEM && data->toward_ipa)
 			ipa->modem_tx_count++;
 	}
 
-	if (!ipa_filter_map_valid(ipa, filter_map))
+	if (!ipa_filtered_valid(ipa, filtered))
 		goto err_endpoint_exit;
 
-	return filter_map;	/* Non-zero bitmask */
+	ipa->filtered = filtered;
+
+	return 0;
 
 err_endpoint_exit:
 	ipa_endpoint_exit(ipa);
 
-	return 0;	/* Error */
+	return -EINVAL;
 }

drivers/net/ipa/ipa_endpoint.h

···
 void ipa_endpoint_default_route_set(struct ipa *ipa, u32 endpoint_id);
 void ipa_endpoint_default_route_clear(struct ipa *ipa);
 
-u32 ipa_endpoint_init(struct ipa *ipa, u32 count,
+int ipa_endpoint_init(struct ipa *ipa, u32 count,
 		      const struct ipa_gsi_endpoint_data *data);
 void ipa_endpoint_exit(struct ipa *ipa);
 

drivers/net/ipa/ipa_main.c

···
 		goto err_mem_exit;
 
 	/* Result is a non-zero mask of endpoints that support filtering */
-	ipa->filter_map = ipa_endpoint_init(ipa, data->endpoint_count,
-					    data->endpoint_data);
-	if (!ipa->filter_map) {
-		ret = -EINVAL;
+	ret = ipa_endpoint_init(ipa, data->endpoint_count, data->endpoint_data);
+	if (ret)
 		goto err_gsi_exit;
-	}
 
 	ret = ipa_table_init(ipa);
 	if (ret)

drivers/net/ipa/ipa_table.c

···
 	return ipa_mem_find(ipa, mem_id);
 }
 
-bool ipa_filter_map_valid(struct ipa *ipa, u32 filter_map)
+bool ipa_filtered_valid(struct ipa *ipa, u64 filtered)
 {
 	struct device *dev = &ipa->pdev->dev;
 	u32 count;
 
-	if (!filter_map) {
+	if (!filtered) {
 		dev_err(dev, "at least one filtering endpoint is required\n");
 
 		return false;
 	}
 
-	count = hweight32(filter_map);
+	count = hweight64(filtered);
 	if (count > ipa->filter_count) {
-		dev_err(dev, "too many filtering endpoints (%u, max %u)\n",
+		dev_err(dev, "too many filtering endpoints (%u > %u)\n",
 			count, ipa->filter_count);
 
 		return false;
···
 static int
 ipa_filter_reset_table(struct ipa *ipa, bool hashed, bool ipv6, bool modem)
 {
-	u32 ep_mask = ipa->filter_map;
-	u32 count = hweight32(ep_mask);
+	u64 ep_mask = ipa->filtered;
 	struct gsi_trans *trans;
 	enum gsi_ee_id ee_id;
 
-	trans = ipa_cmd_trans_alloc(ipa, count);
+	trans = ipa_cmd_trans_alloc(ipa, hweight64(ep_mask));
 	if (!trans) {
 		dev_err(&ipa->pdev->dev,
 			"no transaction for %s filter reset\n",
···
 		 * to hold the bitmap itself.  The size of the hashed filter
 		 * table is either the same as the non-hashed one, or zero.
 		 */
-		count = 1 + hweight32(ipa->filter_map);
+		count = 1 + hweight64(ipa->filtered);
 		hash_count = hash_mem && hash_mem->size ? count : 0;
 	} else {
 		/* The size of a route table region determines the number
···
 static void ipa_filter_config(struct ipa *ipa, bool modem)
 {
 	enum gsi_ee_id ee_id = modem ? GSI_EE_MODEM : GSI_EE_AP;
-	u32 ep_mask = ipa->filter_map;
+	u64 ep_mask = ipa->filtered;
 
 	if (!ipa_table_hash_support(ipa))
 		return;
···
 		/* Filter tables must able to hold the endpoint bitmap plus
 		 * an entry for each endpoint that supports filtering
 		 */
-		if (count < 1 + hweight32(ipa->filter_map))
+		if (count < 1 + hweight64(ipa->filtered))
 			return false;
 	} else {
 		/* Routing tables must be able to hold all modem entries,
···
 	 * that option, so there's no shifting required.
 	 */
 	if (ipa->version < IPA_VERSION_5_0)
-		*virt++ = cpu_to_le64((u64)ipa->filter_map << 1);
+		*virt++ = cpu_to_le64(ipa->filtered << 1);
 	else
-		*virt++ = cpu_to_le64((u64)ipa->filter_map);
+		*virt++ = cpu_to_le64(ipa->filtered);
 
 	/* All the rest contain the DMA address of the zero rule */
 	le_addr = cpu_to_le64(addr);

drivers/net/ipa/ipa_table.h

···
 struct ipa;
 
 /**
- * ipa_filter_map_valid() - Validate a filter table endpoint bitmap
+ * ipa_filtered_valid() - Validate a filter table endpoint bitmap
  * @ipa:	IPA pointer
- * @filter_mask: Filter table endpoint bitmap to check
+ * @filtered:	Filter table endpoint bitmap to check
  *
  * Return:	true if all regions are valid, false otherwise
  */
-bool ipa_filter_map_valid(struct ipa *ipa, u32 filter_mask);
+bool ipa_filtered_valid(struct ipa *ipa, u64 filtered);
 
 /**
  * ipa_table_hash_support() - Return true if hashed tables are supported