netdev - Re: [PATCH net-next 06/14] sctp: do the basic send and recv for PLPMTUD probe

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Message-ID: <CADvbK_dCgaqrr=pxZGfBmm=3m31+eKgcfkU7AowFbnZAcC92bQ@mail.gmail.com>
Date:   Mon, 21 Jun 2021 21:13:59 -0400
From:   Xin Long <lucien.xin@...il.com>
To:     kernel test robot <lkp@...el.com>
Cc:     network dev <netdev@...r.kernel.org>, davem <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        "linux-sctp @ vger . kernel . org" <linux-sctp@...r.kernel.org>,
        kbuild-all@...ts.01.org
Subject: Re: [PATCH net-next 06/14] sctp: do the basic send and recv for
 PLPMTUD probe

This is a "set but not used" warning, I can fix it after.

Thanks.

On Sun, Jun 20, 2021 at 11:50 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi Xin,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on net-next/master]
>
> url:    https://github.com/0day-ci/linux/commits/Xin-Long/sctp-implement-RFC8899-Packetization-Layer-Path-MTU-Discovery-for-SCTP-transport/20210621-094007
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git adc2e56ebe6377f5c032d96aee0feac30a640453
> config: i386-randconfig-r023-20210620 (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> reproduce (this is a W=1 build):
>         # https://github.com/0day-ci/linux/commit/fcac1d6488c8bc7cb69af9e8051686a674d94fc3
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Xin-Long/sctp-implement-RFC8899-Packetization-Layer-Path-MTU-Discovery-for-SCTP-transport/20210621-094007
>         git checkout fcac1d6488c8bc7cb69af9e8051686a674d94fc3
>         # save the attached .config to linux build tree
>         make W=1 ARCH=i386
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> net/sctp/output.c:215:16: warning: no previous prototype for 'sctp_packet_bundle_pad' [-Wmissing-prototypes]
>      215 | enum sctp_xmit sctp_packet_bundle_pad(struct sctp_packet *pkt, struct sctp_chunk *chunk)
>          |                ^~~~~~~~~~~~~~~~~~~~~~
>    net/sctp/output.c: In function 'sctp_packet_bundle_pad':
> >> net/sctp/output.c:219:20: warning: variable 'sp' set but not used [-Wunused-but-set-variable]
>      219 |  struct sctp_sock *sp;
>          |                    ^~
>
>
> vim +/sctp_packet_bundle_pad +215 net/sctp/output.c
>
>    213
>    214  /* Try to bundle a pad chunk into a packet with a heartbeat chunk for PLPMTUTD probe */
>  > 215  enum sctp_xmit sctp_packet_bundle_pad(struct sctp_packet *pkt, struct sctp_chunk *chunk)
>    216  {
>    217          struct sctp_transport *t = pkt->transport;
>    218          struct sctp_chunk *pad;
>  > 219          struct sctp_sock *sp;
>    220          int overhead = 0;
>    221
>    222          if (!chunk->pmtu_probe)
>    223                  return SCTP_XMIT_OK;
>    224
>    225          sp = sctp_sk(t->asoc->base.sk);
>    226
>    227          /* calculate the Padding Data size for the pad chunk */
>    228          overhead += sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
>    229          overhead += sizeof(struct sctp_sender_hb_info) + sizeof(struct sctp_pad_chunk);
>    230          pad = sctp_make_pad(t->asoc, t->pl.probe_size - overhead);
>    231          if (!pad)
>    232                  return SCTP_XMIT_DELAY;
>    233
>    234          list_add_tail(&pad->list, &pkt->chunk_list);
>    235          pkt->size += SCTP_PAD4(ntohs(pad->chunk_hdr->length));
>    236          chunk->transport = t;
>    237
>    238          return SCTP_XMIT_OK;
>    239  }
>    240
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org