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Date: Fri, 26 May 2023 10:22:52 +0100
From: Max Tottenham <mtottenh@...mai.com>
To: kernel test robot <lkp@...el.com>
CC: <netdev@...r.kernel.org>, <oe-kbuild-all@...ts.linux.dev>,
Jamal Hadi
Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko
<jiri@...nulli.us>,
Amir Vadai <amir@...ai.me>, Josh Hunt <johunt@...mai.com>
Subject: Re: [PATCH] net/sched: act_pedit: Parse L3 Header for L4 offset
On 05/26, kernel test robot wrote:
> Hi Max,
>
> kernel test robot noticed the following build errors:
>
> [auto build test ERROR on net/main]
> [also build test ERROR on net-next/main linus/master v6.4-rc3 next-20230525]
> [cannot apply to horms-ipvs/master]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information ]
>
> url: https://github.com/intel-lab-lkp/linux/commits/Max-Tottenham/net-sched-act_pedit-Parse-L3-Header-for-L4-offset/20230526-020135
> base: net/main
> patch link: https://lore.kernel.org/r/20230525164741.4188115-1-mtottenh%40akamai.com
> patch subject: [PATCH] net/sched: act_pedit: Parse L3 Header for L4 offset
> config: mips-allyesconfig https://download.01.org/0day-ci/archive/20230526/202305261541.N165u9TZ-lkp@intel.com/config )
> compiler: mips-linux-gcc (GCC) 12.1.0
> reproduce (this is a W=1 build):
> mkdir -p ~/bin
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # https://github.com/intel-lab-lkp/linux/commit/dc60ecbe9b4432221ba2109d4ca1956f47d5c5d6
> git remote add linux-review https://github.com/intel-lab-lkp/linux
> git fetch --no-tags linux-review Max-Tottenham/net-sched-act_pedit-Parse-L3-Header-for-L4-offset/20230526-020135
> git checkout dc60ecbe9b4432221ba2109d4ca1956f47d5c5d6
> # save the config file
> mkdir build_dir && cp config build_dir/.config
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 ~/bin/make.cross W=1 O=build_dir ARCH=mips olddefconfig
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 ~/bin/make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202305261541.N165u9TZ-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> net/sched/act_pedit.c: In function 'tcf_pedit_act':
> >> net/sched/act_pedit.c:428:17: error: 'rc' undeclared (first use in this function); did you mean 'rq'?
> 428 | rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
> | ^~
> | rq
> net/sched/act_pedit.c:428:17: note: each undeclared identifier is reported only once for each function it appears in
>
>
> vim +428 net/sched/act_pedit.c
>
> 386
> 387 TC_INDIRECT_SCOPE int tcf_pedit_act(struct sk_buff *skb,
> 388 const struct tc_action *a,
> 389 struct tcf_result *res)
> 390 {
> 391 enum pedit_header_type htype = TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
> 392 enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
> 393 struct tcf_pedit *p = to_pedit(a);
> 394 struct tcf_pedit_key_ex *tkey_ex;
> 395 struct tcf_pedit_parms *parms;
> 396 struct tc_pedit_key *tkey;
> 397 u32 max_offset;
> 398 int i;
> 399
> 400 parms = rcu_dereference_bh(p->parms);
> 401
> 402 max_offset = (skb_transport_header_was_set(skb) ?
> 403 skb_transport_offset(skb) :
> 404 skb_network_offset(skb)) +
> 405 parms->tcfp_off_max_hint;
> 406 if (skb_ensure_writable(skb, min(skb->len, max_offset)))
> 407 goto done;
> 408
> 409 tcf_lastuse_update(&p->tcf_tm);
> 410 tcf_action_update_bstats(&p->common, skb);
> 411
> 412 tkey = parms->tcfp_keys;
> 413 tkey_ex = parms->tcfp_keys_ex;
> 414
> 415 for (i = parms->tcfp_nkeys; i > 0; i--, tkey++) {
> 416 int offset = tkey->off;
> 417 int hoffset = 0;
> 418 u32 *ptr, hdata;
> 419 u32 val;
> 420
> 421 if (tkey_ex) {
> 422 htype = tkey_ex->htype;
> 423 cmd = tkey_ex->cmd;
> 424
> 425 tkey_ex++;
> 426 }
> 427
> > 428 rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
Ah yep looks like I made an omission while bringing back the rate limited
error message. Will respin a V2 with the fix.
> 429 if (rc) {
> 430 pr_info_ratelimited("tc action pedit unable to extract header offset for header type (0x%x)\n", htype);
> 431 goto bad;
> 432 }
> 433
> 434 if (tkey->offmask) {
> 435 u8 *d, _d;
> 436
> 437 if (!offset_valid(skb, hoffset + tkey->at)) {
> 438 pr_info_ratelimited("tc action pedit 'at' offset %d out of bounds\n",
> 439 hoffset + tkey->at);
> 440 goto bad;
> 441 }
> 442 d = skb_header_pointer(skb, hoffset + tkey->at,
> 443 sizeof(_d), &_d);
> 444 if (!d)
> 445 goto bad;
> 446
> 447 offset += (*d & tkey->offmask) >> tkey->shift;
> 448 if (offset % 4) {
> 449 pr_info_ratelimited("tc action pedit offset must be on 32 bit boundaries\n");
> 450 goto bad;
> 451 }
> 452 }
> 453
> 454 if (!offset_valid(skb, hoffset + offset)) {
> 455 pr_info_ratelimited("tc action pedit offset %d out of bounds\n", hoffset + offset);
> 456 goto bad;
> 457 }
> 458
> 459 ptr = skb_header_pointer(skb, hoffset + offset,
> 460 sizeof(hdata), &hdata);
> 461 if (!ptr)
> 462 goto bad;
> 463 /* just do it, baby */
> 464 switch (cmd) {
> 465 case TCA_PEDIT_KEY_EX_CMD_SET:
> 466 val = tkey->val;
> 467 break;
> 468 case TCA_PEDIT_KEY_EX_CMD_ADD:
> 469 val = (*ptr + tkey->val) & ~tkey->mask;
> 470 break;
> 471 default:
> 472 pr_info_ratelimited("tc action pedit bad command (%d)\n", cmd);
> 473 goto bad;
> 474 }
> 475
> 476 *ptr = ((*ptr & tkey->mask) ^ val);
> 477 if (ptr == &hdata)
> 478 skb_store_bits(skb, hoffset + offset, ptr, 4);
> 479 }
> 480
> 481 goto done;
> 482
> 483 bad:
> 484 tcf_action_inc_overlimit_qstats(&p->common);
> 485 done:
> 486 return p->tcf_action;
> 487 }
> 488
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
--
Max Tottenham | Senior Software Engineer
/(* Akamai Technologies
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