linux-kernel - Re: [PATCH v2 6/8] block: keyslot-manager: introduce blk_ksm_restrict_dus_to_queue

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Date:   Fri, 26 Mar 2021 14:28:05 +0800
From:   kernel test robot <lkp@...el.com>
To:     Satya Tangirala <satyat@...gle.com>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, Jens Axboe <axboe@...nel.dk>,
        Eric Biggers <ebiggers@...gle.com>,
        Satya Tangirala <satyat@...gle.com>
Subject: Re: [PATCH v2 6/8] block: keyslot-manager: introduce
 blk_ksm_restrict_dus_to_queue_limits()

Hi Satya,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on block/for-next]
[also build test WARNING on dm/for-next mkp-scsi/for-next scsi/for-next linux/master linus/master v5.12-rc4 next-20210325]
[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]

url:    https://github.com/0day-ci/linux/commits/Satya-Tangirala/ensure-bios-aren-t-split-in-middle-of-crypto-data-unit/20210326-053016
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
config: i386-randconfig-r016-20210325 (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/9b8b677bfdba70695b8d01ee318ef552fcc0392e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Satya-Tangirala/ensure-bios-aren-t-split-in-middle-of-crypto-data-unit/20210326-053016
        git checkout 9b8b677bfdba70695b8d01ee318ef552fcc0392e
        # 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 >>):

>> block/keyslot-manager.c:457:6: warning: no previous prototype for 'blk_ksm_restrict_dus_to_queue_limits' [-Wmissing-prototypes]
     457 | void blk_ksm_restrict_dus_to_queue_limits(struct blk_keyslot_manager *ksm,
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/blk_ksm_restrict_dus_to_queue_limits +457 block/keyslot-manager.c

   452	
   453	/*
   454	 * Restrict the supported data unit sizes of the ksm based on the request queue
   455	 * limits
   456	 */
 > 457	void blk_ksm_restrict_dus_to_queue_limits(struct blk_keyslot_manager *ksm,
   458						  struct queue_limits *limits)
   459	{
   460		/* The largest possible data unit size we support is PAGE_SIZE. */
   461		unsigned long largest_dus = PAGE_SIZE;
   462		unsigned int dus_allowed_mask;
   463		int i;
   464		bool dus_was_restricted = false;
   465	
   466		/*
   467		 * If the queue doesn't support SG gaps, a bio might get split in the
   468		 * middle of a data unit. So require SG gap support for inline
   469		 * encryption for any data unit size larger than a single sector.
   470		 */
   471		if (limits->virt_boundary_mask)
   472			largest_dus = SECTOR_SIZE;
   473	
   474		/*
   475		 * If the queue has chunk_sectors, the bio might be split within a data
   476		 * unit if the data unit size is larger than a single sector. So only
   477		 * support a single sector data unit size in this case.
   478		 */
   479		if (limits->chunk_sectors)
   480			largest_dus = SECTOR_SIZE;
   481	
   482		/*
   483		 * Any bio sent to the queue must be allowed to contain at least a
   484		 * data_unit_size worth of data. Since each segment in a bio contains
   485		 * at least a SECTOR_SIZE worth of data, it's sufficient that
   486		 * queue_max_segments(q) * SECTOR_SIZE >= data_unit_size. So disable
   487		 * all data_unit_sizes not satisfiable.
   488		 */
   489		largest_dus = min(largest_dus,
   490				1UL << (fls(limits->max_segments) - 1 + SECTOR_SHIFT));
   491	
   492		/* Clear all unsupported data unit sizes. */
   493		dus_allowed_mask = (largest_dus << 1) - 1;
   494		for (i = 0; i < ARRAY_SIZE(ksm->crypto_modes_supported); i++) {
   495			if (ksm->crypto_modes_supported[i] & (~dus_allowed_mask))
   496				dus_was_restricted = true;
   497			ksm->crypto_modes_supported[i] &= dus_allowed_mask;
   498		}
   499	
   500		if (dus_was_restricted) {
   501			pr_warn("Disallowed use of encryption data unit sizes above %lu bytes with inline encryption hardware because of device request queue limits.\n",
   502				largest_dus);
   503		}
   504	}
   505	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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