net-sysfs: use rps_tag_ptr and remove metadata from rps_dev_flow_table

Instead of storing the @log at the beginning of rps_dev_flow_table use 5 low order bits of the rps_tag_ptr to store the log of the size. This removes a potential cache line miss (for light traffic). This allows us to switch to one high-order allocation instead of vmalloc() when CONFIG_RFS_ACCEL is not set.

Eric Dumazet committed 8 months ago

Commit a4351631 parent b2cc6184 files · +67 −69Browse files

Showing the changes to include/net/netdev_rx_queue.h (1 of 4 files). Show all

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include/net/netdev_rx_queue.h+2−1

@@ -8,13 +8,14 @@ · 7 unmodified lines
8	8	#include <net/xdp.h>
9	9	#include <net/page_pool/types.h>
10	10	#include <net/netdev_queues.h>
	11	+#include <net/rps-types.h>
11	12
12	13	/* This structure contains an instance of an RX queue. */
13	14	struct netdev_rx_queue {
14	15	struct xdp_rxq_info xdp_rxq;
15	16	#ifdef CONFIG_RPS
16	17	struct rps_map __rcu *rps_map;
17		− struct rps_dev_flow_table __rcu *rps_flow_table;
	18	+ rps_tag_ptr rps_flow_table;
18	19	#endif
19	20	struct kobject kobj;
20	21	const struct attribute_group **groups;