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27 March 2024, 02:37:15 UTC
Revision 3c45d7510cf563be2ebc04f6864b70bc69f68cb9 authored by Linus Torvalds on 24 January 2020, 17:49:20 UTC, committed by Linus Torvalds on 24 January 2020, 17:49:20 UTC 
Merge tag 'powerpc-5.5-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
 
Pull powerpc fixes from Michael Ellerman:
 "Some more powerpc fixes for 5.5:

   - Fix our hash MMU code to avoid having overlapping ids between user
     and kernel, which isn't as bad as it sounds but led to crashes on
     some machines.

   - A fix for the Power9 XIVE interrupt code, which could return the
     wrong interrupt state in obscure error conditions.

   - A minor Kconfig fix for the recently added CONFIG_PPC_UV code.

  Thanks to Aneesh Kumar K.V, Bharata B Rao, Cédric Le Goater, Frederic
  Barrat"

* tag 'powerpc-5.5-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/mm/hash: Fix sharing context ids between kernel & userspace
  powerpc/xive: Discard ESB load value when interrupt is invalid
  powerpc: Ultravisor: Fix the dependencies for CONFIG_PPC_UV
2 parent s 274adbf + 5d2e5dd
Raw File
Tip revision: 3c45d7510cf563be2ebc04f6864b70bc69f68cb9 authored by Linus Torvalds on 24 January 2020, 17:49:20 UTC
Merge tag 'powerpc-5.5-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Tip revision: 3c45d75
xdp1_kern.c 
/* Copyright (c) 2016 PLUMgrid
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */
#define KBUILD_MODNAME "foo"
#include <uapi/linux/bpf.h>
#include <linux/in.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/if_vlan.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include "bpf_helpers.h"

struct {
	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
	__type(key, u32);
	__type(value, long);
	__uint(max_entries, 256);
} rxcnt SEC(".maps");

static int parse_ipv4(void *data, u64 nh_off, void *data_end)
{
	struct iphdr *iph = data + nh_off;

	if (iph + 1 > data_end)
		return 0;
	return iph->protocol;
}

static int parse_ipv6(void *data, u64 nh_off, void *data_end)
{
	struct ipv6hdr *ip6h = data + nh_off;

	if (ip6h + 1 > data_end)
		return 0;
	return ip6h->nexthdr;
}

SEC("xdp1")
int xdp_prog1(struct xdp_md *ctx)
{
	void *data_end = (void *)(long)ctx->data_end;
	void *data = (void *)(long)ctx->data;
	struct ethhdr *eth = data;
	int rc = XDP_DROP;
	long *value;
	u16 h_proto;
	u64 nh_off;
	u32 ipproto;

	nh_off = sizeof(*eth);
	if (data + nh_off > data_end)
		return rc;

	h_proto = eth->h_proto;

	if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
		struct vlan_hdr *vhdr;

		vhdr = data + nh_off;
		nh_off += sizeof(struct vlan_hdr);
		if (data + nh_off > data_end)
			return rc;
		h_proto = vhdr->h_vlan_encapsulated_proto;
	}
	if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
		struct vlan_hdr *vhdr;

		vhdr = data + nh_off;
		nh_off += sizeof(struct vlan_hdr);
		if (data + nh_off > data_end)
			return rc;
		h_proto = vhdr->h_vlan_encapsulated_proto;
	}

	if (h_proto == htons(ETH_P_IP))
		ipproto = parse_ipv4(data, nh_off, data_end);
	else if (h_proto == htons(ETH_P_IPV6))
		ipproto = parse_ipv6(data, nh_off, data_end);
	else
		ipproto = 0;

	value = bpf_map_lookup_elem(&rxcnt, &ipproto);
	if (value)
		*value += 1;

	return rc;
}

char _license[] SEC("license") = "GPL";
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