netdev - Re: [PATCH net-next 2/2] xdp: Add devmap_idx map type for looking up devices by ifindex

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Message-ID: <201902240743.NmDLcizj%fengguang.wu@intel.com>
Date:   Sun, 24 Feb 2019 07:19:50 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     kbuild-all@...org, David Miller <davem@...emloft.net>,
        netdev@...r.kernel.org, Jesper Dangaard Brouer <brouer@...hat.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH net-next 2/2] xdp: Add devmap_idx map type for looking up
 devices by ifindex

Hi Toke,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Toke-H-iland-J-rgensen/xdp-Always-use-a-devmap-for-XDP_REDIRECT-to-a-device/20190224-054907
config: i386-randconfig-a1-201907 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   net/core/filter.c: In function '__bpf_tx_xdp_map':
>> net/core/filter.c:3355:29: warning: passing argument 2 of '__dev_map_insert_ctx' from incompatible pointer type
      __dev_map_insert_ctx(map, dst);
                                ^
   In file included from include/linux/bpf-cgroup.h:5:0,
                    from include/linux/cgroup-defs.h:22,
                    from include/linux/cgroup.h:28,
                    from include/net/netprio_cgroup.h:17,
                    from include/linux/netdevice.h:46,
                    from include/net/sock.h:51,
                    from include/linux/sock_diag.h:8,
                    from net/core/filter.c:29:
   include/linux/bpf.h:715:20: note: expected 'struct net_device *' but argument is of type 'struct bpf_dtab_netdev *'
    static inline void __dev_map_insert_ctx(struct bpf_map *map,
                       ^

vim +/__dev_map_insert_ctx +3355 net/core/filter.c

  3339	
  3340	static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
  3341				    struct bpf_map *map,
  3342				    struct xdp_buff *xdp,
  3343				    u32 index)
  3344	{
  3345		int err;
  3346	
  3347		switch (map->map_type) {
  3348		case BPF_MAP_TYPE_DEVMAP:
  3349		case BPF_MAP_TYPE_DEVMAP_IDX: {
  3350			struct bpf_dtab_netdev *dst = fwd;
  3351	
  3352			err = dev_map_enqueue(dst, xdp, dev_rx);
  3353			if (unlikely(err))
  3354				return err;
> 3355			__dev_map_insert_ctx(map, dst);
  3356			break;
  3357		}
  3358		case BPF_MAP_TYPE_CPUMAP: {
  3359			struct bpf_cpu_map_entry *rcpu = fwd;
  3360	
  3361			err = cpu_map_enqueue(rcpu, xdp, dev_rx);
  3362			if (unlikely(err))
  3363				return err;
  3364			__cpu_map_insert_ctx(map, index);
  3365			break;
  3366		}
  3367		case BPF_MAP_TYPE_XSKMAP: {
  3368			struct xdp_sock *xs = fwd;
  3369	
  3370			err = __xsk_map_redirect(map, xdp, xs);
  3371			return err;
  3372		}
  3373		default:
  3374			break;
  3375		}
  3376		return 0;
  3377	}
  3378	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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