From 9f0fc191371843c4fc000a226b0a26b6c059aacd Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 18 May 2024 19:40:19 +0200
Subject: Merging upstream version 6.7.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 net/xdp/xsk.c      | 33 +++++++++++++++++++++++++++++++--
 net/xdp/xsk_diag.c |  1 +
 2 files changed, 32 insertions(+), 2 deletions(-)

(limited to 'net/xdp')

diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index d849dc04a3..da1582de6e 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -33,6 +33,7 @@
 #include "xsk.h"
 
 #define TX_BATCH_SIZE 32
+#define MAX_PER_SOCKET_BUDGET (TX_BATCH_SIZE)
 
 static DEFINE_PER_CPU(struct list_head, xskmap_flush_list);
 
@@ -395,6 +396,16 @@ void __xsk_map_flush(void)
 	}
 }
 
+#ifdef CONFIG_DEBUG_NET
+bool xsk_map_check_flush(void)
+{
+	if (list_empty(this_cpu_ptr(&xskmap_flush_list)))
+		return false;
+	__xsk_map_flush();
+	return true;
+}
+#endif
+
 void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries)
 {
 	xskq_prod_submit_n(pool->cq, nb_entries);
@@ -417,16 +428,25 @@ EXPORT_SYMBOL(xsk_tx_release);
 
 bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc)
 {
+	bool budget_exhausted = false;
 	struct xdp_sock *xs;
 
 	rcu_read_lock();
+again:
 	list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) {
+		if (xs->tx_budget_spent >= MAX_PER_SOCKET_BUDGET) {
+			budget_exhausted = true;
+			continue;
+		}
+
 		if (!xskq_cons_peek_desc(xs->tx, desc, pool)) {
 			if (xskq_has_descs(xs->tx))
 				xskq_cons_release(xs->tx);
 			continue;
 		}
 
+		xs->tx_budget_spent++;
+
 		/* This is the backpressure mechanism for the Tx path.
 		 * Reserve space in the completion queue and only proceed
 		 * if there is space in it. This avoids having to implement
@@ -440,6 +460,14 @@ bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc)
 		return true;
 	}
 
+	if (budget_exhausted) {
+		list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list)
+			xs->tx_budget_spent = 0;
+
+		budget_exhausted = false;
+		goto again;
+	}
+
 out:
 	rcu_read_unlock();
 	return false;
@@ -683,12 +711,13 @@ static struct sk_buff *xsk_build_skb(struct xdp_sock *xs,
 			memcpy(vaddr, buffer, len);
 			kunmap_local(vaddr);
 
-			skb_add_rx_frag(skb, nr_frags, page, 0, len, 0);
+			skb_add_rx_frag(skb, nr_frags, page, 0, len, PAGE_SIZE);
+			refcount_add(PAGE_SIZE, &xs->sk.sk_wmem_alloc);
 		}
 	}
 
 	skb->dev = dev;
-	skb->priority = xs->sk.sk_priority;
+	skb->priority = READ_ONCE(xs->sk.sk_priority);
 	skb->mark = READ_ONCE(xs->sk.sk_mark);
 	skb->destructor = xsk_destruct_skb;
 	xsk_set_destructor_arg(skb);
diff --git a/net/xdp/xsk_diag.c b/net/xdp/xsk_diag.c
index 22b36c8143..9f89553672 100644
--- a/net/xdp/xsk_diag.c
+++ b/net/xdp/xsk_diag.c
@@ -211,4 +211,5 @@ static void __exit xsk_diag_exit(void)
 module_init(xsk_diag_init);
 module_exit(xsk_diag_exit);
 MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("XDP socket monitoring via SOCK_DIAG");
 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, AF_XDP);
-- 
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