@@ 1,30 0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Arjan van de Ven <arjan@linux.intel.com>
-Date: Fri, 29 Jul 2016 19:10:52 +0000
-Subject: [PATCH] give rdrand some credit
-
-try to credit rdrand/rdseed with some entropy
-
-In VMs but even modern hardware, we're super starved for entropy, and while we can
-and do wear a tin foil hat, it's very hard to argue that
-rdrand and rdtsc add zero entropy.
----
- drivers/char/random.c | 2 ++
- 1 file changed, 2 insertions(+)
-
-diff --git a/drivers/char/random.c b/drivers/char/random.c
-index 605969ed0f96..1cab72339cba 100644
---- a/drivers/char/random.c
-+++ b/drivers/char/random.c
-@@ -1757,6 +1757,8 @@ static void __init init_std_data(struct entropy_store *r)
- 		if (!arch_get_random_seed_long(&rv) &&
- 		    !arch_get_random_long(&rv))
- 			rv = random_get_entropy();
-+		else
-+			credit_entropy_bits(r, 1);
- 		mix_pool_bytes(r, &rv, sizeof(rv));
- 	}
- 	mix_pool_bytes(r, utsname(), sizeof(*(utsname())));
--- 
-https://clearlinux.org
-


@@ 1,26 0,0 @@
---- linux-5.14.7/lib/raid6/algos.c~	2021-09-22 10:39:33.000000000 +0000
-+++ linux-5.14.7/lib/raid6/algos.c	2021-09-27 17:36:50.117114553 +0000
-@@ -128,8 +128,10 @@
- 
- 	for (best = NULL, algo = raid6_recov_algos; *algo; algo++)
- 		if (!best || (*algo)->priority > best->priority)
--			if (!(*algo)->valid || (*algo)->valid())
-+			if (!(*algo)->valid || (*algo)->valid()) {
- 				best = *algo;
-+				break;
-+			}
- 
- 	if (best) {
- 		raid6_2data_recov = best->data2;
-@@ -198,8 +200,10 @@
- 			}
- 			preempt_enable();
- 
--			if (best == *algo)
-+			if (best == *algo) {
- 				bestxorperf = perf;
-+				break;
-+			}
- 
- 			pr_info("raid6: %-8s xor() %5ld MB/s\n", (*algo)->name,
- 				(perf * HZ * (disks-2)) >>


@@ 1,301 0,0 @@
-From 3df684c1a3d08a4f649689053a3d527b3b5fda9e Mon Sep 17 00:00:00 2001
-From: Eric Dumazet <edumazet@google.com>
-Date: Mon, 15 Nov 2021 11:02:45 -0800
-Subject: tcp: avoid indirect calls to sock_rfree
-
-TCP uses sk_eat_skb() when skbs can be removed from receive queue.
-However, the call to skb_orphan() from __kfree_skb() incurs
-an indirect call so sock_rfee(), which is more expensive than
-a direct call, especially for CONFIG_RETPOLINE=y.
-
-Add tcp_eat_recv_skb() function to make the call before
-__kfree_skb().
-
-Signed-off-by: Eric Dumazet <edumazet@google.com>
-Signed-off-by: David S. Miller <davem@davemloft.net>
----
- net/ipv4/tcp.c | 20 +++++++++++++++-----
- 1 file changed, 15 insertions(+), 5 deletions(-)
-
-diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
-index 9175e0d729f5e..4e7011672aa9a 100644
---- a/net/ipv4/tcp.c
-+++ b/net/ipv4/tcp.c
-@@ -1580,6 +1580,16 @@ void tcp_cleanup_rbuf(struct sock *sk, int copied)
- 		tcp_send_ack(sk);
- }
- 
-+static void tcp_eat_recv_skb(struct sock *sk, struct sk_buff *skb)
-+{
-+	if (likely(skb->destructor == sock_rfree)) {
-+		sock_rfree(skb);
-+		skb->destructor = NULL;
-+		skb->sk = NULL;
-+	}
-+	sk_eat_skb(sk, skb);
-+}
-+
- static struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off)
- {
- 	struct sk_buff *skb;
-@@ -1599,7 +1609,7 @@ static struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off)
- 		 * splitted a fat GRO packet, while we released socket lock
- 		 * in skb_splice_bits()
- 		 */
--		sk_eat_skb(sk, skb);
-+		tcp_eat_recv_skb(sk, skb);
- 	}
- 	return NULL;
- }
-@@ -1665,11 +1675,11 @@ int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
- 				continue;
- 		}
- 		if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) {
--			sk_eat_skb(sk, skb);
-+			tcp_eat_recv_skb(sk, skb);
- 			++seq;
- 			break;
- 		}
--		sk_eat_skb(sk, skb);
-+		tcp_eat_recv_skb(sk, skb);
- 		if (!desc->count)
- 			break;
- 		WRITE_ONCE(tp->copied_seq, seq);
-@@ -2481,14 +2491,14 @@ skip_copy:
- 		if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)
- 			goto found_fin_ok;
- 		if (!(flags & MSG_PEEK))
--			sk_eat_skb(sk, skb);
-+			tcp_eat_recv_skb(sk, skb);
- 		continue;
- 
- found_fin_ok:
- 		/* Process the FIN. */
- 		WRITE_ONCE(*seq, *seq + 1);
- 		if (!(flags & MSG_PEEK))
--			sk_eat_skb(sk, skb);
-+			tcp_eat_recv_skb(sk, skb);
- 		break;
- 	} while (len > 0);
- 
--- 
-cgit 1.2.3-1.el7
-
-From f35f821935d8df76f9c92e2431a225bdff938169 Mon Sep 17 00:00:00 2001
-From: Eric Dumazet <edumazet@google.com>
-Date: Mon, 15 Nov 2021 11:02:46 -0800
-Subject: tcp: defer skb freeing after socket lock is released
-
-tcp recvmsg() (or rx zerocopy) spends a fair amount of time
-freeing skbs after their payload has been consumed.
-
-A typical ~64KB GRO packet has to release ~45 page
-references, eventually going to page allocator
-for each of them.
-
-Currently, this freeing is performed while socket lock
-is held, meaning that there is a high chance that
-BH handler has to queue incoming packets to tcp socket backlog.
-
-This can cause additional latencies, because the user
-thread has to process the backlog at release_sock() time,
-and while doing so, additional frames can be added
-by BH handler.
-
-This patch adds logic to defer these frees after socket
-lock is released, or directly from BH handler if possible.
-
-Being able to free these skbs from BH handler helps a lot,
-because this avoids the usual alloc/free assymetry,
-when BH handler and user thread do not run on same cpu or
-NUMA node.
-
-One cpu can now be fully utilized for the kernel->user copy,
-and another cpu is handling BH processing and skb/page
-allocs/frees (assuming RFS is not forcing use of a single CPU)
-
-Tested:
- 100Gbit NIC
- Max throughput for one TCP_STREAM flow, over 10 runs
-
-MTU : 1500
-Before: 55 Gbit
-After:  66 Gbit
-
-MTU : 4096+(headers)
-Before: 82 Gbit
-After:  95 Gbit
-
-Signed-off-by: Eric Dumazet <edumazet@google.com>
-Signed-off-by: David S. Miller <davem@davemloft.net>
----
- include/linux/skbuff.h |  2 ++
- include/net/sock.h     |  3 +++
- include/net/tcp.h      | 10 ++++++++++
- net/ipv4/tcp.c         | 27 +++++++++++++++++++++++++--
- net/ipv4/tcp_ipv4.c    |  1 +
- net/ipv6/tcp_ipv6.c    |  1 +
- 6 files changed, 42 insertions(+), 2 deletions(-)
-
-diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
-index 686a666d073d5..b8b806512e161 100644
---- a/include/linux/skbuff.h
-+++ b/include/linux/skbuff.h
-@@ -36,6 +36,7 @@
- #include <linux/splice.h>
- #include <linux/in6.h>
- #include <linux/if_packet.h>
-+#include <linux/llist.h>
- #include <net/flow.h>
- #include <net/page_pool.h>
- #if IS_ENABLED(CONFIG_NF_CONNTRACK)
-@@ -743,6 +744,7 @@ struct sk_buff {
- 		};
- 		struct rb_node		rbnode; /* used in netem, ip4 defrag, and tcp stack */
- 		struct list_head	list;
-+		struct llist_node	ll_node;
- 	};
- 
- 	union {
-diff --git a/include/net/sock.h b/include/net/sock.h
-index 2d40fe4c7718e..2578d1f455a7a 100644
---- a/include/net/sock.h
-+++ b/include/net/sock.h
-@@ -63,6 +63,7 @@
- #include <linux/indirect_call_wrapper.h>
- #include <linux/atomic.h>
- #include <linux/refcount.h>
-+#include <linux/llist.h>
- #include <net/dst.h>
- #include <net/checksum.h>
- #include <net/tcp_states.h>
-@@ -408,6 +409,8 @@ struct sock {
- 		struct sk_buff	*head;
- 		struct sk_buff	*tail;
- 	} sk_backlog;
-+	struct llist_head defer_list;
-+
- #define sk_rmem_alloc sk_backlog.rmem_alloc
- 
- 	int			sk_forward_alloc;
-diff --git a/include/net/tcp.h b/include/net/tcp.h
-index 05c81677aaf78..44e442bf23f9c 100644
---- a/include/net/tcp.h
-+++ b/include/net/tcp.h
-@@ -1368,6 +1368,16 @@ static inline bool tcp_checksum_complete(struct sk_buff *skb)
- }
- 
- bool tcp_add_backlog(struct sock *sk, struct sk_buff *skb);
-+
-+void __sk_defer_free_flush(struct sock *sk);
-+
-+static inline void sk_defer_free_flush(struct sock *sk)
-+{
-+	if (llist_empty(&sk->defer_list))
-+		return;
-+	__sk_defer_free_flush(sk);
-+}
-+
- int tcp_filter(struct sock *sk, struct sk_buff *skb);
- void tcp_set_state(struct sock *sk, int state);
- void tcp_done(struct sock *sk);
-diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
-index 4e7011672aa9a..33cd9a1c199ce 100644
---- a/net/ipv4/tcp.c
-+++ b/net/ipv4/tcp.c
-@@ -1580,14 +1580,34 @@ void tcp_cleanup_rbuf(struct sock *sk, int copied)
- 		tcp_send_ack(sk);
- }
- 
-+void __sk_defer_free_flush(struct sock *sk)
-+{
-+	struct llist_node *head;
-+	struct sk_buff *skb, *n;
-+
-+	head = llist_del_all(&sk->defer_list);
-+	llist_for_each_entry_safe(skb, n, head, ll_node) {
-+		prefetch(n);
-+		skb_mark_not_on_list(skb);
-+		__kfree_skb(skb);
-+	}
-+}
-+EXPORT_SYMBOL(__sk_defer_free_flush);
-+
- static void tcp_eat_recv_skb(struct sock *sk, struct sk_buff *skb)
- {
-+	__skb_unlink(skb, &sk->sk_receive_queue);
- 	if (likely(skb->destructor == sock_rfree)) {
- 		sock_rfree(skb);
- 		skb->destructor = NULL;
- 		skb->sk = NULL;
-+		if (!skb_queue_empty(&sk->sk_receive_queue) ||
-+		    !llist_empty(&sk->defer_list)) {
-+			llist_add(&skb->ll_node, &sk->defer_list);
-+			return;
-+		}
- 	}
--	sk_eat_skb(sk, skb);
-+	__kfree_skb(skb);
- }
- 
- static struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off)
-@@ -2422,6 +2442,7 @@ static int tcp_recvmsg_locked(struct sock *sk, struct msghdr *msg, size_t len,
- 			/* Do not sleep, just process backlog. */
- 			__sk_flush_backlog(sk);
- 		} else {
-+			sk_defer_free_flush(sk);
- 			sk_wait_data(sk, &timeo, last);
- 		}
- 
-@@ -2540,6 +2561,7 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
- 	ret = tcp_recvmsg_locked(sk, msg, len, nonblock, flags, &tss,
- 				 &cmsg_flags);
- 	release_sock(sk);
-+	sk_defer_free_flush(sk);
- 
- 	if (cmsg_flags && ret >= 0) {
- 		if (cmsg_flags & TCP_CMSG_TS)
-@@ -3065,7 +3087,7 @@ int tcp_disconnect(struct sock *sk, int flags)
- 		sk->sk_frag.page = NULL;
- 		sk->sk_frag.offset = 0;
- 	}
--
-+	sk_defer_free_flush(sk);
- 	sk_error_report(sk);
- 	return 0;
- }
-@@ -4194,6 +4216,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
- 		err = BPF_CGROUP_RUN_PROG_GETSOCKOPT_KERN(sk, level, optname,
- 							  &zc, &len, err);
- 		release_sock(sk);
-+		sk_defer_free_flush(sk);
- 		if (len >= offsetofend(struct tcp_zerocopy_receive, msg_flags))
- 			goto zerocopy_rcv_cmsg;
- 		switch (len) {
-diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
-index 5ad81bfb27b2f..3dd19a2bf06c4 100644
---- a/net/ipv4/tcp_ipv4.c
-+++ b/net/ipv4/tcp_ipv4.c
-@@ -2102,6 +2102,7 @@ process:
- 
- 	sk_incoming_cpu_update(sk);
- 
-+	sk_defer_free_flush(sk);
- 	bh_lock_sock_nested(sk);
- 	tcp_segs_in(tcp_sk(sk), skb);
- 	ret = 0;
-diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
-index f41f14b701233..3b7d6ede13649 100644
---- a/net/ipv6/tcp_ipv6.c
-+++ b/net/ipv6/tcp_ipv6.c
-@@ -1758,6 +1758,7 @@ process:
- 
- 	sk_incoming_cpu_update(sk);
- 
-+	sk_defer_free_flush(sk);
- 	bh_lock_sock_nested(sk);
- 	tcp_segs_in(tcp_sk(sk), skb);
- 	ret = 0;
--- 
-cgit 1.2.3-1.el7
-