netdev - Re: [PATCH net-next v3] virtio-net: page_to_skb() use build

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Date:   Wed, 28 Apr 2021 09:21:58 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc:     netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: Re: [PATCH net-next v3] virtio-net: page_to_skb() use build_skb when
 there's sufficient tailroom


在 2021/4/27 上午10:46, Xuan Zhuo 写道:
> On Tue, 20 Apr 2021 10:41:03 +0800, Jason Wang <jasowang@...hat.com> wrote:
>>
>> Btw, since the patch modifies a critical path of virtio-net I suggest to
>> test the following cases:
>>
>> 1) netperf TCP stream
>> 2) netperf UDP with packet size from 64 to PAGE_SIZE
>> 3) XDP_PASS with 1)
>> 4) XDP_PASS with 2)
>> 5) XDP metadata with 1)
>> 6) XDP metadata with 2)
> I have completed the above test on the latest net-next branch. The tested script
> and xdp code are as follows. The kernel is with KCOV and everything is normal
> without exception.
>
> Thanks.


Looks good.

Thanks for the testing.


>
> ## test script:
> 	#!/usr/bin/env sh
>
>
> 	for s in $(seq 64 4096)
> 	do
> 	    netperf -H 192.168.122.202  -t UDP_STREAM -- -m $s
> 	done
>
> 	for s in $(seq 64 4096)
> 	do
> 	    netperf -H 192.168.122.202  -t TCP_STREAM -- -m $s
> 	done
>
> ## xdp pass:
>
> 	#define KBUILD_MODNAME "foo"
> 	#include <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/icmp.h>
>
> 	#define DEFAULT_TTL 64
> 	#define MAX_PCKT_SIZE 600
> 	#define ICMP_TOOBIG_SIZE 98
> 	#define ICMP_TOOBIG_PAYLOAD_SIZE 92
>
>
> 	#define SEC(NAME) __attribute__((section(NAME), used))
>
>
> 	SEC("xdp")
> 	int _xdp(struct xdp_md *xdp)
> 	{
> 	        return XDP_PASS;
> 	}
>
> 	char _license[] SEC("license") = "GPL";
>
> ## xdp metadata:
>
> 	#define KBUILD_MODNAME "foo"
> 	#include <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/icmp.h>
>
> 	static long (*bpf_xdp_adjust_meta)(struct xdp_md *xdp_md, int delta) = (void *) 54;
>
>
> 	#define SEC(NAME) __attribute__((section(NAME), used))
>
> 	struct meta_info {
> 	        __u32 mark;
> 	} __attribute__((aligned(4)));
>
> 	SEC("xdp_mark")
> 	int _xdp_mark(struct xdp_md *ctx)
> 	{
> 	        struct meta_info *meta;
> 	        void *data, *data_end;
> 	        int ret;
>
> 	        /* Reserve space in-front of data pointer for our meta info.
> 	         * (Notice drivers not supporting data_meta will fail here!)
> 	         */
> 	        ret = bpf_xdp_adjust_meta(ctx, -(int)sizeof(*meta));
> 	        if (ret < 0)
> 	                return XDP_ABORTED;
>
> 	        /* Notice: Kernel-side verifier requires that loading of
> 	         * ctx->data MUST happen _after_ helper bpf_xdp_adjust_meta(),
> 	         * as pkt-data pointers are invalidated.  Helpers that require
> 	         * this are determined/marked by bpf_helper_changes_pkt_data()
> 	         */
> 	        data = (void *)(unsigned long)ctx->data;
>
> 	        /* Check data_meta have room for meta_info struct */
> 	        meta = (void *)(unsigned long)ctx->data_meta;
> 	        if ((void *)(meta + 1) > data)
> 	                return XDP_ABORTED;
>
> 	        meta->mark = 42;
>
> 	        return XDP_PASS;
> 	}
>
>
> 	char _license[] SEC("license") = "GPL";
>