Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Alexei Starovoitov says:

====================
pull-request: bpf-next 2021-07-15

The following pull-request contains BPF updates for your *net-next* tree.

We've added 45 non-merge commits during the last 15 day(s) which contain
a total of 52 files changed, 3122 insertions(+), 384 deletions(-).

The main changes are:

1) Introduce bpf timers, from Alexei.

2) Add sockmap support for unix datagram socket, from Cong.

3) Fix potential memleak and UAF in the verifier, from He.

4) Add bpf_get_func_ip helper, from Jiri.

5) Improvements to generic XDP mode, from Kumar.

6) Support for passing xdp_md to XDP programs in bpf_prog_run, from Zvi.
===================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 6 deletions

diff --git a/samples/bpf/xdp_redirect_cpu_user.c b/samples/bpf/xdp_redirect_cpu_user.c
index 576411612523..d3ecdc18b9c1 100644
--- a/samples/bpf/xdp_redirect_cpu_user.c
+++ b/samples/bpf/xdp_redirect_cpu_user.c
@@ -792,13 +792,23 @@ int main(int argc, char **argv)
 
 	n_cpus = get_nprocs_conf();
 
-	/* Notice: choosing he queue size is very important with the
-	 * ixgbe driver, because it's driver page recycling trick is
-	 * dependend on pages being returned quickly.  The number of
-	 * out-standing packets in the system must be less-than 2x
-	 * RX-ring size.
+	/* Notice: Choosing the queue size is very important when CPU is
+	 * configured with power-saving states.
+	 *
+	 * If deepest state take 133 usec to wakeup from (133/10^6). When link
+	 * speed is 10Gbit/s ((10*10^9/8) in bytes/sec). How many bytes can
+	 * arrive with in 133 usec at this speed: (10*10^9/8)*(133/10^6) =
+	 * 166250 bytes. With MTU size packets this is 110 packets, and with
+	 * minimum Ethernet (MAC-preamble + intergap) 84 bytes is 1979 packets.
+	 *
+	 * Setting default cpumap queue to 2048 as worst-case (small packet)
+	 * should be +64 packet due kthread wakeup call (due to xdp_do_flush)
+	 * worst-case is 2043 packets.
+	 *
+	 * Sysadm can configured system to avoid deep-sleep via:
+	 *   tuned-adm profile network-latency
 	 */
-	qsize = 128+64;
+	qsize = 2048;
 
 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
 	prog_load_attr.file = filename;