Merge branch 'improve-gbeth-performance-on-renesas-rz-g2l-and-related-socs'

Paul Barker says:

====================
Improve GbEth performance on Renesas RZ/G2L and related SoCs

This series aims to improve performance of the GbEth IP in the Renesas
RZ/G2L SoC family and the RZ/G3S SoC, which use the ravb driver. Along
the way, we do some refactoring and ensure that napi_complete_done() is
used in accordance with the NAPI documentation for both GbEth and R-Car
code paths.

Much of the performance improvement comes from enabling SW IRQ
Coalescing for all SoCs using the GbEth IP, and NAPI Threaded mode for
single core SoCs using the GbEth IP. These can be enabled/disabled at
runtime via sysfs, but our goal is to set sensible defaults which get
good performance on the affected SoCs.

The rest of the performance improvement comes from using a page pool to
allocate RX buffers, and reducing the allocation size from >8kB to 2kB.

The overall performance impact of this patch series seen in testing with
iperf3 is as follows (see patches 5-7 for more detailed results):
  * RZ/G2L:
    * TCP TX: +1.8% bandwidth
    * TCP RX: +1% bandwidth at 47% less CPU load
    * UDP RX: +1% bandwidth at 26% less CPU load

  * RZ/G2UL:
    * TCP TX: +37% bandwidth
    * TCP RX: +43% bandwidth
    * UDP TX: -8% bandwidth
    * UDP RX: +32500% bandwidth (!)

  * RZ/G3S:
    * TCP TX: +25% bandwidth
    * TCP RX: +76% bandwidth
    * UDP TX: -9% bandwidth
    * UDP RX: +37900% bandwidth (!)

  * RZ/Five:
    * TCP TX: +18% bandwidth
    * TCP RX: +212% bandwidth
    * UDP TX: +2% bandwidth
    * UDP RX: +inf bandwidth (test no longer crashes)

There is no significant impact on bandwidth or CPU load in testing on
RZ/G2H or R-Car M3N.

Fixing the crash in UDP RX testing for RZ/Five is a cumulative effect of
patches 1, 2, 5 & 6 so this is very difficult to break out as a bugfix
for backporting.

Changes v4->v5:
  * Added Sergey's Reviewed-by tags.
  * Improved the commit message for patch 2/7.
  * Re-wrapped to 80 cols, except where this would significantly impact
    readability.
  * Use lower case `skb` consistently in comments.
  * Included <net/page_pool/types.h> in ravb.h.
  * Moved rx_buffer_size so it is in the same place in ravb_hw_info as
    rx_max_desc_use was previously.
  * Used reverse xmas tree ordering in variable declarations.
  * Split lines after binary operators, instead of before.
  * Factor subtraction of sizeof(__sum16) out of the if condition in
    ravb_rx_csum_gbeth().
  * Add blank lines after variable declarations where needed.
  * Used goto instead of break to handle napi_build_skb() failure in
    ravb_rx_gbeth(). Break was incorrectly scoped to the surrounding
    switch statement, when it's the outer loop we really want to break
    out of.
  * Used continue instead of break to handle NULL priv->rx_1st_skb in
    ravb_rx_gbeth() as we may still be able to process further
    descriptors.
  * Unconditionally set priv->rx_1st_skb = NULL after processing a
    packet in ravb_rx_gbeth(). We don't need to check die_dt as this
    will be a no-op for single descriptor packets.
  * Moved napi_build_skb() call after dma_sync_single_for_cpu() in
    ravb_rx_rcar() to align the order of operations with ravb_rx_gbeth()
    and ensure the data is sync'd before it is accessed.
  * Moved zeroing of rx_buff->page to the end of packet processing in
    ravb_rx_rcar() to align the order of operations with
    ravb_rx_gbeth().

Changes v3->v4:
  * Dependency patches have merged so this is no longer an RFC.
  * Fixed update of stats->rx_packets.
  * Simplified refactoring following feedback from Niklas and Sergey.
  * Renamed needs_irq_coalesce -> coalesce_irqs.
  * Used a separate page pool for each RX queue.
  * Passed struct ravb_rx_desc to ravb_alloc_rx_buffer() so that we can
    simplify the calling function.
  * Explained the calculation of rx_desc->ds_cc.
  * Added handling of nonlinear SKBs in ravb_rx_csum_gbeth().
  * Used Niklas' suggested commit message for patch 2/7.
  * Added Sergey's Reviewed-by tags to patches 5/7 and 6/7.

Changes v2->v3:
  * Incorporated feedback on RFC v2 from Sergey.
  * Split out bugfixes and rebased. This changed the order of what was
    the first 5 patches of v2 and things look a little different so I've
    not picked up Reviewed-by tags from v2.
  * Further refactoring and tidy up of RX ring refill and
    ravb_rx_gbeth().
  * Switched to using a page pool to allocate RX buffers.
  * Re-tested and provided updated performance figures.

Changes v1->v2:
  * Marked as RFC as the series depends on unmerged patches.
  * Refactored R-Car code paths as well as GbEth code paths.
  * Updated references to the patches this series depends on.
====================

Link: https://lore.kernel.org/r/20240604072825.7490-1-paul.barker.ct@bp.renesas.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/renesas/ravb.h

@@ -19,6 +19,7 @@
 #include <linux/phy.h>
 #include <linux/platform_device.h>
 #include <linux/ptp_clock_kernel.h>
+#include <net/page_pool/types.h>
 
 #define BE_TX_RING_SIZE	64	/* TX ring size for Best Effort */
 #define BE_RX_RING_SIZE	1024	/* RX ring size for Best Effort */
@@ -1039,7 +1040,7 @@ struct ravb_ptp {
 };
 
 struct ravb_hw_info {
-	bool (*receive)(struct net_device *ndev, int *quota, int q);
+	int (*receive)(struct net_device *ndev, int budget, int q);
 	void (*set_rate)(struct net_device *ndev);
 	int (*set_feature)(struct net_device *ndev, netdev_features_t features);
 	int (*dmac_init)(struct net_device *ndev);
@@ -1051,9 +1052,10 @@ struct ravb_hw_info {
 	int stats_len;
 	u32 tccr_mask;
 	u32 rx_max_frame_size;
-	u32 rx_max_desc_use;
+	u32 rx_buffer_size;
 	u32 rx_desc_size;
 	unsigned aligned_tx: 1;
+	unsigned coalesce_irqs:1;	/* Needs software IRQ coalescing */
 
 	/* hardware features */
 	unsigned internal_delay:1;	/* AVB-DMAC has internal delays */
@@ -1070,6 +1072,11 @@ struct ravb_hw_info {
 	unsigned half_duplex:1;		/* E-MAC supports half duplex mode */
 };
 
+struct ravb_rx_buffer {
+	struct page *page;
+	unsigned int offset;
+};
+
 struct ravb_private {
 	struct net_device *ndev;
 	struct platform_device *pdev;
@@ -1093,7 +1100,8 @@ struct ravb_private {
 	struct ravb_tx_desc *tx_ring[NUM_TX_QUEUE];
 	void *tx_align[NUM_TX_QUEUE];
 	struct sk_buff *rx_1st_skb;
-	struct sk_buff **rx_skb[NUM_RX_QUEUE];
+	struct page_pool *rx_pool[NUM_RX_QUEUE];
+	struct ravb_rx_buffer *rx_buffers[NUM_RX_QUEUE];
 	struct sk_buff **tx_skb[NUM_TX_QUEUE];
 	u32 rx_over_errors;
 	u32 rx_fifo_errors;