linux-kernel - Re: [PATCH net-next v7 3/3] selftests/net: add flush id selftests

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Date: Wed, 17 Apr 2024 16:01:22 +0200
From: Richard Gobert <richardbgobert@...il.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, dsahern@...nel.org,
 shuah@...nel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH net-next v7 3/3] selftests/net: add flush id selftests

Willem de Bruijn wrote:
> Richard Gobert wrote:
>> Added flush id selftests to test different cases where DF flag is set or
>> unset and id value changes in the following packets. All cases where the
>> packets should coalesce or should not coalesce are tested.
>>
>> Signed-off-by: Richard Gobert <richardbgobert@...il.com>
> 
> Thanks for adding tests. Minor point below only. The tests pass both
> before and after your series, right? Then immediately a nice
> validation that the optimization has no unintended side-effects.
> 

Yes, the logic is preserved - tests pass both in net-next and after
applying the patch :)

>> ---
>>  tools/testing/selftests/net/gro.c | 144 ++++++++++++++++++++++++++++++
>>  1 file changed, 144 insertions(+)
>>
>> diff --git a/tools/testing/selftests/net/gro.c b/tools/testing/selftests/net/gro.c
>> index 353e1e867fbb..74ab06953c38 100644
>> --- a/tools/testing/selftests/net/gro.c
>> +++ b/tools/testing/selftests/net/gro.c
>> @@ -617,6 +617,120 @@ static void add_ipv6_exthdr(void *buf, void *optpkt, __u8 exthdr_type, char *ext
>>  	iph->payload_len = htons(ntohs(iph->payload_len) + MIN_EXTHDR_SIZE);
>>  }
>>  
>> +static void fix_ip4_checksum(struct iphdr *iph)
>> +{
>> +	iph->check = 0;
>> +	iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
>> +}
>> +
>> +static void send_flush_id_case(int fd, struct sockaddr_ll *daddr, int tcase)
>> +{
>> +	bool send_three = false;
>> +	static char buf1[MAX_HDR_LEN + PAYLOAD_LEN];
>> +	static char buf2[MAX_HDR_LEN + PAYLOAD_LEN];
>> +	static char buf3[MAX_HDR_LEN + PAYLOAD_LEN];
>> +
>> +	create_packet(buf1, 0, 0, PAYLOAD_LEN, 0);
>> +	create_packet(buf2, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
>> +	create_packet(buf3, PAYLOAD_LEN * 2, 0, PAYLOAD_LEN, 0);
>> +
>> +	struct iphdr *iph1 = (struct iphdr *)(buf1 + ETH_HLEN);
>> +	struct iphdr *iph2 = (struct iphdr *)(buf2 + ETH_HLEN);
>> +	struct iphdr *iph3 = (struct iphdr *)(buf3 + ETH_HLEN);
>> +
> 
> minor: variable defintions before code, and reverse chrismas tree.

Good catch, I'll apply these changes and push v8 when the relevant series
for net will be merged. Thanks!