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From: Bruce Richardson <bruce.richardson@intel.com>
To: "Morten Brørup" <mb@smartsharesystems.com>
Cc: Ronan Randles <ronan.randles@intel.com>,
	dev@dpdk.org, harry.van.haaren@intel.com
Subject: Re: [PATCH 01/12] net: add string to IPv4 parse function
Date: Wed, 15 Dec 2021 10:11:36 +0000	[thread overview]
Message-ID: <Ybm/WKMLdWkEcLvw@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <98CBD80474FA8B44BF855DF32C47DC35D86D77@smartserver.smartshare.dk>

On Wed, Dec 15, 2021 at 10:35:44AM +0100, Morten Brørup wrote:
> > From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> > Sent: Wednesday, 15 December 2021 10.27
> > 
> > On Tue, Dec 14, 2021 at 06:31:06PM +0100, Morten Brørup wrote:
> > > > From: Ronan Randles [mailto:ronan.randles@intel.com]
> > > > Sent: Tuesday, 14 December 2021 15.13
> > > >
> > > > Added function that accepts ip string as a parameter and returns an
> > ip
> > > > address represented by a uint32_t. Relevant unit test for this
> > function
> > > > is also included.
> > > >
> > > > Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>
> > > > Signed-off-by: Ronan Randles <ronan.randles@intel.com>
> > > > ---
> > >
> > > [snip]
> > >
> > > > diff --git a/lib/net/rte_ip.h b/lib/net/rte_ip.h
> > > > index c575250852..188054fda4 100644
> > > > --- a/lib/net/rte_ip.h
> > > > +++ b/lib/net/rte_ip.h
> > > > @@ -426,6 +426,24 @@ rte_ipv4_udptcp_cksum_verify(const struct
> > > > rte_ipv4_hdr *ipv4_hdr,
> > > >  	return 0;
> > > >  }
> > > >
> > > > +/**
> > > > + * IP address parser.
> > > > + *
> > > > + * @param src_ip
> > > > + *   The IP address to be parsed.
> > > > + * @param output_addr
> > > > + *   The array in which the parsed digits will be saved.
> > > > + *
> > > > + * @retval 0
> > > > + *   Success.
> > > > + * @retval -1
> > > > + *   Failure due to invalid input arguments.
> > > > + */
> > > > +
> > > > +__rte_experimental
> > > > +int32_t
> > > > +rte_ip_parse_addr(const char *src_ip, uint32_t *output_addr);
> > > > +
> > >
> > > Good initiative!
> > >
> > > This should set a precedent for to/from string functions, so be
> > careful about names and calling conventions.
> > >
> > > I have a few suggestions:
> > >
> > > The function should take a parameter to tell if the input string must
> > be zero-terminated or not. This is highly useful for parsing subnet
> > strings (e.g. "192.0.2.0/24") and IP range strings (e.g. "192.0.2.2-
> > 192.0.2.253").
> > >
> > > The return value should be the number of characters read from the
> > input string, and still -1 on error. With this modification, also
> > consider using the return type ssize_t instead of int32_t.
> > >
> > Interesting point on the "must be zero-terminated" parameter. However,
> > if
> > the return value is the number of characters read, then the user can
> > check
> > for null-termination very easily after the call, and not need the
> > parameter. Therefore, I would suggest having the function always assume
> > chars after the address and let the user check for null if needed
> > afterwards, to keep function simpler.
> 
> That would require additional lines of code in the application. I would rather have that additional code inside the utility function. There is no need to keep the function simple.
>
Well, it's only an extra item in the error-check conditional, but point
taken. I have no strong opinion here.

  reply	other threads:[~2021-12-15 10:11 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-14 14:12 [PATCH 00/12] add packet generator library and example app Ronan Randles
2021-12-14 14:12 ` [PATCH 01/12] net: add string to IPv4 parse function Ronan Randles
2021-12-14 17:31   ` Morten Brørup
2021-12-15  9:27     ` Bruce Richardson
2021-12-15  9:35       ` Morten Brørup
2021-12-15 10:11         ` Bruce Richardson [this message]
2022-01-19 14:20   ` Thomas Monjalon
2021-12-14 14:12 ` [PATCH 02/12] net: add function to pretty print IPv4 Ronan Randles
2021-12-14 16:08   ` Stephen Hemminger
2021-12-14 17:42     ` Morten Brørup
2021-12-14 17:31   ` Morten Brørup
2021-12-15  1:06     ` Ananyev, Konstantin
2021-12-15  3:20       ` Stephen Hemminger
2021-12-15  7:23         ` Morten Brørup
2021-12-15 13:06           ` Ananyev, Konstantin
2022-01-19 14:24             ` Thomas Monjalon
2022-01-19 14:41               ` Van Haaren, Harry
2021-12-14 14:12 ` [PATCH 03/12] gen: add files for initial traffic generation library Ronan Randles
2021-12-14 14:12 ` [PATCH 04/12] gen: add basic Rx and Tx routines and tests Ronan Randles
2021-12-14 14:12 ` [PATCH 05/12] gen: add raw packet data API " Ronan Randles
2021-12-15 12:40   ` Jerin Jacob
2021-12-17 11:40     ` Van Haaren, Harry
2021-12-17 16:19       ` Thomas Monjalon
2021-12-20 10:21         ` Van Haaren, Harry
2022-01-19 14:56           ` Thomas Monjalon
2022-01-20 10:21             ` Van Haaren, Harry
2022-01-21 10:45               ` Van Haaren, Harry
2021-12-20 13:21       ` Jerin Jacob
2022-01-21 14:20         ` Xueming(Steven) Li
2021-12-14 14:12 ` [PATCH 06/12] gen: add parsing infrastructure and Ether protocol Ronan Randles
2021-12-14 14:12 ` [PATCH 07/12] gen: add gen IP parsing Ronan Randles
2021-12-14 14:12 ` [PATCH 08/12] examples/generator: import code from basicfwd.c Ronan Randles
2021-12-14 14:12 ` [PATCH 09/12] examples/generator: enable gen library for traffic gen Ronan Randles
2021-12-14 14:12 ` [PATCH 10/12] examples/generator: telemetry support Ronan Randles
2021-12-14 14:12 ` [PATCH 11/12] examples/generator: link status check added Ronan Randles
2021-12-14 14:12 ` [PATCH 12/12] examples/generator: line rate limiting Ronan Randles
2021-12-14 16:10   ` Stephen Hemminger
2021-12-14 14:57 ` [PATCH 00/12] add packet generator library and example app Bruce Richardson
2021-12-14 15:59   ` Randles, Ronan
2022-01-12 16:18   ` Morten Brørup
2021-12-15 12:31 ` Jerin Jacob
2021-12-15 14:07   ` Bruce Richardson
2022-01-21 10:31 ` [PATCH v2 00/15] " Ronan Randles
2022-01-21 10:31   ` [PATCH v2 01/15] net: add string to IPv4 parse function Ronan Randles
2022-01-21 10:31   ` [PATCH v2 02/15] net: add function to pretty print IPv4 Ronan Randles
2022-01-21 16:20     ` Stephen Hemminger
2022-01-21 10:31   ` [PATCH v2 03/15] gen: add files for initial traffic generation library Ronan Randles
2022-01-21 10:31   ` [PATCH v2 04/15] gen: add basic Rx and Tx routines and tests Ronan Randles
2022-01-21 10:31   ` [PATCH v2 05/15] gen: add raw packet data API " Ronan Randles
2022-01-21 10:31   ` [PATCH v2 06/15] gen: add parsing infrastructure and Ether protocol Ronan Randles
2022-01-21 10:31   ` [PATCH v2 07/15] gen: add gen IP parsing Ronan Randles
2022-01-21 10:31   ` [PATCH v2 08/15] examples/generator: import code from basicfwd.c Ronan Randles
2022-01-21 10:31   ` [PATCH v2 09/15] examples/generator: enable gen library for traffic gen Ronan Randles
2022-01-21 10:31   ` [PATCH v2 10/15] examples/generator: telemetry support Ronan Randles
2022-01-21 10:31   ` [PATCH v2 11/15] examples/generator: link status check added Ronan Randles
2022-01-21 10:31   ` [PATCH v2 12/15] examples/generator: line rate limiting Ronan Randles
2022-01-21 10:31   ` [PATCH v2 13/15] gen: add UDP support Ronan Randles
2022-01-21 10:31   ` [PATCH v2 14/15] net/vxlan: instance flag endianness refactored Ronan Randles
2022-01-21 10:31   ` [PATCH v2 15/15] gen: add VXLAN support Ronan Randles
2022-01-21 14:44 ` [PATCH 00/12] add packet generator library and example app Xueming(Steven) Li
2022-01-21 15:24   ` Van Haaren, Harry
2022-01-24 10:48     ` Ananyev, Konstantin

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