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From: "Björn Töpel" <bjorn.topel@intel.com>
To: "Daniel Borkmann" <daniel@iogearbox.net>,
	"Björn Töpel" <bjorn.topel@gmail.com>,
	ast@kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org
Cc: maciej.fijalkowski@intel.com, hawk@kernel.org, toke@redhat.com,
	magnus.karlsson@intel.com, john.fastabend@gmail.com,
	kuba@kernel.org, davem@davemloft.net,
	Jesper Dangaard Brouer <brouer@redhat.com>
Subject: Re: [PATCH bpf-next v5 2/2] bpf, xdp: restructure redirect actions
Date: Fri, 5 Mar 2021 18:11:43 +0100	[thread overview]
Message-ID: <222735a9-0cbe-7131-7fd8-f638ddecbedc@intel.com> (raw)
In-Reply-To: <ddbbeadc-bead-904a-200a-b75cd995b254@iogearbox.net>

On 2021-03-05 16:44, Daniel Borkmann wrote:
> On 2/27/21 1:21 PM, Björn Töpel wrote:
> [...]
>> diff --git a/include/linux/filter.h b/include/linux/filter.h
>> index 008691fd3b58..a7752badc2ec 100644
>> --- a/include/linux/filter.h
>> +++ b/include/linux/filter.h
>> @@ -646,11 +646,20 @@ struct bpf_redirect_info {
>>       u32 flags;
>>       u32 tgt_index;
>>       void *tgt_value;
>> -    struct bpf_map *map;
>> +    u32 map_id;
>> +    u32 tgt_type;
>>       u32 kern_flags;
>>       struct bpf_nh_params nh;
>>   };
>> +enum xdp_redirect_type {
>> +    XDP_REDIR_UNSET,
>> +    XDP_REDIR_DEV_IFINDEX,
> 
> [...]
> 
>> +    XDP_REDIR_DEV_MAP,
>> +    XDP_REDIR_CPU_MAP,
>> +    XDP_REDIR_XSK_MAP,
> 
> Did you eval whether for these maps we can avoid the redundant def above 
> by just
> passing in map->map_type as ri->tgt_type and inferring the 
> XDP_REDIR_UNSET from
> invalid map_id of 0 (given the idr will never allocate such)?
>

I'll take a stab at it!


> [...]
>> @@ -4068,10 +4039,9 @@ BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, 
>> flags)
>>       if (unlikely(flags))
>>           return XDP_ABORTED;
>> -    ri->flags = flags;
>> -    ri->tgt_index = ifindex;
>> -    ri->tgt_value = NULL;
>> -    WRITE_ONCE(ri->map, NULL);
>> +    ri->tgt_type = XDP_REDIR_DEV_IFINDEX;
>> +    ri->tgt_index = 0;
>> +    ri->tgt_value = (void *)(long)ifindex;
> 
> nit: Bit ugly to pass this in /read out this way, maybe union if we 
> cannot use
> tgt_index?
>

Dito!


Thanks for the input! I'll get back with a v6!


Björn


>>       return XDP_REDIRECT;
>>   }
>> diff --git a/net/xdp/xskmap.c b/net/xdp/xskmap.c
>> index 711acb3636b3..2c58d88aa69d 100644
>> --- a/net/xdp/xskmap.c
>> +++ b/net/xdp/xskmap.c
>> @@ -87,7 +87,6 @@ static void xsk_map_free(struct bpf_map *map)
>>   {
>>       struct xsk_map *m = container_of(map, struct xsk_map, map);
>> -    bpf_clear_redirect_map(map);
>>       synchronize_net();
>>       bpf_map_area_free(m);
>>   }
>> @@ -229,7 +228,8 @@ static int xsk_map_delete_elem(struct bpf_map 
>> *map, void *key)
>>   static int xsk_map_redirect(struct bpf_map *map, u32 ifindex, u64 
>> flags)
>>   {
>> -    return __bpf_xdp_redirect_map(map, ifindex, flags, 
>> __xsk_map_lookup_elem);
>> +    return __bpf_xdp_redirect_map(map, ifindex, flags, 
>> __xsk_map_lookup_elem,
>> +                      XDP_REDIR_XSK_MAP);
>>   }
>>   void xsk_map_try_sock_delete(struct xsk_map *map, struct xdp_sock *xs,
>>
> 

  reply	other threads:[~2021-03-05 17:12 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-27 12:21 [PATCH bpf-next v5 0/2] Optimize bpf_redirect_map()/xdp_do_redirect() Björn Töpel
2021-02-27 12:21 ` [PATCH bpf-next v5 1/2] bpf, xdp: make bpf_redirect_map() a map operation Björn Töpel
2021-03-05 15:55   ` Daniel Borkmann
2021-03-05 17:11     ` Björn Töpel
2021-02-27 12:21 ` [PATCH bpf-next v5 2/2] bpf, xdp: restructure redirect actions Björn Töpel
2021-03-05 15:44   ` Daniel Borkmann
2021-03-05 17:11     ` Björn Töpel [this message]
2021-03-05 22:56       ` Daniel Borkmann

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