From: Laurent Vivier <lvivier@redhat.com>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: passt-dev@passt.top
Subject: Re: [PATCH v4 5/8] checksum: use csum_ip4_header() in udp.c and tcp.c
Date: Fri, 1 Mar 2024 13:31:11 +0100 [thread overview]
Message-ID: <ecd5773c-bf24-44b1-a200-a333062dffa5@redhat.com> (raw)
In-Reply-To: <ZeESTj6olXE6NGti@zatzit>
On 3/1/24 00:25, David Gibson wrote:
> On Thu, Feb 29, 2024 at 05:59:52PM +0100, Laurent Vivier wrote:
>> We can find the same function to compute the IPv4 header
>> checksum in tcp.c, udp.c and tap.c
>>
>> Use the function defined for tap.c, csum_ip4_header(), but
>> with the code used in tcp.c and udp.c as it doesn't need a fully
>> initialiazed IPv4 header, only protocol, tot_len, saddr and daddr.
>>
>> Signed-off-by: Laurent Vivier <lvivier@redhat.com>
>> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
>> ---
>>
>> Notes:
>> v4:
>> - rebase
>>
>> v3:
>> - function parameters provide tot_len, saddr, daddr and protocol
>> rather than an iphdr
>>
>> v2:
>> - use csum_ip4_header() from checksum.c
>> - use code from tcp.c and udp.c in csum_ip4_header()
>> - use "const struct iphfr *", check is not updated by the
>> function but by the caller.
>>
>> checksum.c | 17 +++++++++++++----
>> checksum.h | 3 ++-
>> tap.c | 3 ++-
>> tcp.c | 24 +++---------------------
>> udp.c | 20 ++------------------
>> 5 files changed, 22 insertions(+), 45 deletions(-)
>>
>> diff --git a/checksum.c b/checksum.c
>> index 74e3742bc6f6..511b296a9a80 100644
>> --- a/checksum.c
>> +++ b/checksum.c
>> @@ -57,6 +57,7 @@
>> #include <linux/icmpv6.h>
>>
>> #include "util.h"
>> +#include "ip.h"
>> #include "checksum.h"
>>
>> /* Checksums are optional for UDP over IPv4, so we usually just set
>> @@ -116,13 +117,21 @@ uint16_t csum_fold(uint32_t sum)
>> uint16_t csum(const void *buf, size_t len, uint32_t init);
>>
>> /**
>> - * csum_ip4_header() - Calculate and set IPv4 header checksum
>> + * csum_ip4_header() - Calculate IPv4 header checksum
>> * @ip4h: IPv4 header
>
> Function comment needs to be updated for the new parameters. In
> particular it needs to note that tot_len, saddr and daddr are all
> passed in network order.
>
> As noted elsewhere, I kind of hate passing non-host-endian values in
> plain integer types, but I can see why doing otherwise here would be
> very awkward.
Perhaps we can use __be16 and __be32 types to really show the endianness in the code?
Thanks,
Laurent
next prev parent reply other threads:[~2024-03-01 12:31 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-29 16:59 [PATCH v4 0/8] Add vhost-user support to passt (part 1) Laurent Vivier
2024-02-29 16:59 ` [PATCH v4 1/8] pcap: add pcap_iov() Laurent Vivier
2024-02-29 23:16 ` David Gibson
2024-02-29 16:59 ` [PATCH v4 2/8] checksum: align buffers Laurent Vivier
2024-02-29 16:59 ` [PATCH v4 3/8] checksum: add csum_iov() Laurent Vivier
2024-02-29 16:59 ` [PATCH v4 4/8] util: move IP stuff from util.[ch] to ip.[ch] Laurent Vivier
2024-02-29 23:19 ` David Gibson
2024-03-01 12:06 ` Laurent Vivier
2024-02-29 16:59 ` [PATCH v4 5/8] checksum: use csum_ip4_header() in udp.c and tcp.c Laurent Vivier
2024-02-29 23:25 ` David Gibson
2024-03-01 12:31 ` Laurent Vivier [this message]
2024-02-29 16:59 ` [PATCH v4 6/8] checksum: introduce functions to compute the header part checksum for TCP/UDP Laurent Vivier
2024-02-29 23:42 ` David Gibson
2024-02-29 16:59 ` [PATCH v4 7/8] tap: make tap_update_mac() generic Laurent Vivier
2024-02-29 16:59 ` [PATCH v4 8/8] tcp: Introduce ipv4_fill_headers()/ipv6_fill_headers() Laurent Vivier
2024-02-29 23:54 ` David Gibson
2024-03-03 13:50 ` Laurent Vivier
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