kernel: pick patches for MediaTek Ethernet from linux-next

Pick patches with several fixes and improvements, preparation for
upcoming WED (TX) [1] as well as basic XDP support [2] with MediaTek's
Filogic SoCs to the mtk_eth_soc driver.

Also pick follow-up patch fixing Ethernet on MT7621 [3].

Tested on Bananapi BPi-R3 (MT7986), Bananapi BPi-R64 (MT7622),
Bananapi BPi-R2 (MT7623), MikroTik RouterBoard M11G (MT7621).

[1]: https://patchwork.kernel.org/project/netdevbpf/list/?series=662108&state=*
[2]: https://patchwork.kernel.org/project/netdevbpf/list/?series=675368&state=*
     (the first part of the series adding wed nodes to mt7986a.dtsi was
      applied to the copy of mt7986a.dtsi in our tree)
[3]: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=5e69163d3b9931098922b3fc2f8e786af8c1f37e

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 137 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.15/601-v5.18-page_pool-Add-recycle-stats.patch b/target/linux/generic/backport-5.15/601-v5.18-page_pool-Add-recycle-stats.patch
new file mode 100644
index 0000000000..8330ae811d
--- /dev/null
+++ b/target/linux/generic/backport-5.15/601-v5.18-page_pool-Add-recycle-stats.patch
@@ -0,0 +1,137 @@
+commit ad6fa1e1ab1b8164f1ba296b1b4dc556a483bcad
+Author: Joe Damato <jdamato@fastly.com>
+Date:   Tue Mar 1 23:55:48 2022 -0800
+
+    page_pool: Add recycle stats
+    
+    Add per-cpu stats tracking page pool recycling events:
+            - cached: recycling placed page in the page pool cache
+            - cache_full: page pool cache was full
+            - ring: page placed into the ptr ring
+            - ring_full: page released from page pool because the ptr ring was full
+            - released_refcnt: page released (and not recycled) because refcnt > 1
+    
+    Signed-off-by: Joe Damato <jdamato@fastly.com>
+    Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
+    Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
+    Signed-off-by: David S. Miller <davem@davemloft.net>
+
+--- a/include/net/page_pool.h
++++ b/include/net/page_pool.h
+@@ -93,6 +93,18 @@ struct page_pool_alloc_stats {
+ 	u64 refill; /* allocations via successful refill */
+ 	u64 waive;  /* failed refills due to numa zone mismatch */
+ };
++
++struct page_pool_recycle_stats {
++	u64 cached;	/* recycling placed page in the cache. */
++	u64 cache_full; /* cache was full */
++	u64 ring;	/* recycling placed page back into ptr ring */
++	u64 ring_full;	/* page was released from page-pool because
++			 * PTR ring was full.
++			 */
++	u64 released_refcnt; /* page released because of elevated
++			      * refcnt
++			      */
++};
+ #endif
+ 
+ struct page_pool {
+@@ -136,6 +148,10 @@ struct page_pool {
+ 	 */
+ 	struct ptr_ring ring;
+ 
++#ifdef CONFIG_PAGE_POOL_STATS
++	/* recycle stats are per-cpu to avoid locking */
++	struct page_pool_recycle_stats __percpu *recycle_stats;
++#endif
+ 	atomic_t pages_state_release_cnt;
+ 
+ 	/* A page_pool is strictly tied to a single RX-queue being
+--- a/net/core/page_pool.c
++++ b/net/core/page_pool.c
+@@ -29,8 +29,15 @@
+ #ifdef CONFIG_PAGE_POOL_STATS
+ /* alloc_stat_inc is intended to be used in softirq context */
+ #define alloc_stat_inc(pool, __stat)	(pool->alloc_stats.__stat++)
++/* recycle_stat_inc is safe to use when preemption is possible. */
++#define recycle_stat_inc(pool, __stat)							\
++	do {										\
++		struct page_pool_recycle_stats __percpu *s = pool->recycle_stats;	\
++		this_cpu_inc(s->__stat);						\
++	} while (0)
+ #else
+ #define alloc_stat_inc(pool, __stat)
++#define recycle_stat_inc(pool, __stat)
+ #endif
+ 
+ static int page_pool_init(struct page_pool *pool,
+@@ -80,6 +87,12 @@ static int page_pool_init(struct page_po
+ 	    pool->p.flags & PP_FLAG_PAGE_FRAG)
+ 		return -EINVAL;
+ 
++#ifdef CONFIG_PAGE_POOL_STATS
++	pool->recycle_stats = alloc_percpu(struct page_pool_recycle_stats);
++	if (!pool->recycle_stats)
++		return -ENOMEM;
++#endif
++
+ 	if (ptr_ring_init(&pool->ring, ring_qsize, GFP_KERNEL) < 0)
+ 		return -ENOMEM;
+ 
+@@ -412,7 +425,12 @@ static bool page_pool_recycle_in_ring(st
+ 	else
+ 		ret = ptr_ring_produce_bh(&pool->ring, page);
+ 
+-	return (ret == 0) ? true : false;
++	if (!ret) {
++		recycle_stat_inc(pool, ring);
++		return true;
++	}
++
++	return false;
+ }
+ 
+ /* Only allow direct recycling in special circumstances, into the
+@@ -423,11 +441,14 @@ static bool page_pool_recycle_in_ring(st
+ static bool page_pool_recycle_in_cache(struct page *page,
+ 				       struct page_pool *pool)
+ {
+-	if (unlikely(pool->alloc.count == PP_ALLOC_CACHE_SIZE))
++	if (unlikely(pool->alloc.count == PP_ALLOC_CACHE_SIZE)) {
++		recycle_stat_inc(pool, cache_full);
+ 		return false;
++	}
+ 
+ 	/* Caller MUST have verified/know (page_ref_count(page) == 1) */
+ 	pool->alloc.cache[pool->alloc.count++] = page;
++	recycle_stat_inc(pool, cached);
+ 	return true;
+ }
+ 
+@@ -482,6 +503,7 @@ __page_pool_put_page(struct page_pool *p
+ 	 * doing refcnt based recycle tricks, meaning another process
+ 	 * will be invoking put_page.
+ 	 */
++	recycle_stat_inc(pool, released_refcnt);
+ 	/* Do not replace this with page_pool_return_page() */
+ 	page_pool_release_page(pool, page);
+ 	put_page(page);
+@@ -495,6 +517,7 @@ void page_pool_put_page(struct page_pool
+ 	page = __page_pool_put_page(pool, page, dma_sync_size, allow_direct);
+ 	if (page && !page_pool_recycle_in_ring(pool, page)) {
+ 		/* Cache full, fallback to free pages */
++		recycle_stat_inc(pool, ring_full);
+ 		page_pool_return_page(pool, page);
+ 	}
+ }
+@@ -641,6 +664,9 @@ static void page_pool_free(struct page_p
+ 	if (pool->p.flags & PP_FLAG_DMA_MAP)
+ 		put_device(pool->p.dev);
+ 
++#ifdef CONFIG_PAGE_POOL_STATS
++	free_percpu(pool->recycle_stats);
++#endif
+ 	kfree(pool);
+ }
+