From: Stephen Hemminger <stephen@networkplumber.org>
To: Thomas Monjalon <thomas@monjalon.net>
Cc: Michael Pfeiffer <michael.pfeiffer@tu-ilmenau.de>,
Olivier Matz <olivier.matz@6wind.com>,
Andrew Rybchenko <arybchenko@solarflare.com>,
dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v2] net: calculate checksums for packets with IPv4 options
Date: Mon, 5 Oct 2020 19:39:45 -0700 [thread overview]
Message-ID: <20201005193945.19aebfb5@hermes.local> (raw)
In-Reply-To: <7417467.3Ncg9TYYCI@thomas>
On Tue, 06 Oct 2020 00:55:19 +0200
Thomas Monjalon <thomas@monjalon.net> wrote:
> > - cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct rte_ipv4_hdr));
> > + cksum = rte_raw_cksum(ipv4_hdr, (ipv4_hdr->version_ihl & 0xf) * 4);
>
> Truly naive questions:
> - doesn't it deserve a static inline function rte_ipv4_hdr_len()?
Makes sense to have that.
> - how generated code for "* 4" compares with "<< 2"?
The code is the same if value is unsigned.
next prev parent reply other threads:[~2020-10-06 2:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 11:32 [dpdk-dev] [PATCH] " Michael Pfeiffer
2020-08-29 11:43 ` Andrew Rybchenko
2020-09-01 9:47 ` [dpdk-dev] [PATCH v2] " Michael Pfeiffer
2020-09-07 7:48 ` Andrew Rybchenko
2020-10-05 22:55 ` Thomas Monjalon
2020-10-06 2:39 ` Stephen Hemminger [this message]
2020-10-06 8:10 ` Olivier Matz
2020-10-06 9:51 ` Michael Pfeiffer
2020-10-06 15:10 ` Thomas Monjalon
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