Re: [PATCH net 1/5] net: ipa: program metadata mask differently

On 6/10/20 7:19 PM, kernel test robot wrote:

Hi Alex,

I love your patch! Perhaps something to improve:

Thanks kernel test robot!

Somehow the "static" specifier got dropped in my patch.

I will fix this when I post version 2, shortly.

					-Alex

[auto build test WARNING on net/master]

url:    https://github.com/0day-ci/linux/commits/Alex-Elder/net-ipa-endpoint-configuration-fixes/20200611-035600
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git 89dc68533b190117e1a2fb4298d88b96b3580abf
config: arm64-allyesconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

<<                  from drivers/net/ipa/ipa_endpoint.c:8:

quoted

quoted

drivers/net/ipa/ipa_endpoint.c:457:6: warning: no previous prototype for 'ipa_endpoint_init_hdr' [-Wmissing-prototypes]

457 | void ipa_endpoint_init_hdr(struct ipa_endpoint *endpoint)
|      ^~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/bits.h:23,
from include/linux/bitops.h:5,
from include/linux/kernel.h:12,
from include/linux/list.h:9,
from include/linux/rculist.h:10,
from include/linux/pid.h:5,
from include/linux/sched.h:14,
from include/linux/ratelimit.h:6,
from include/linux/dev_printk.h:16,
from include/linux/device.h:15,
from drivers/net/ipa/ipa_endpoint.c:8:
drivers/net/ipa/ipa_endpoint.c: In function 'ipa_endpoint_config':
include/linux/bits.h:26:28: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
26 |   __builtin_constant_p((l) > (h)), (l) > (h), 0)))
|                            ^
include/linux/build_bug.h:16:62: notkke: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
|                                                              ^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
39 |  (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
|   ^~~~~~~~~~~~~~~~~~~
drivers/net/ipa/ipa_endpoint.c:1546:12: note: in expansion of macro 'GENMASK'
1546 |  tx_mask = GENMASK(max - 1, 0);
|            ^~~~~~~
include/linux/bits.h:26:40: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
26 |   __builtin_constant_p((l) > (h)), (l) > (h), 0)))
|                                        ^
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
|                                                              ^
include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
39 |  (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
|   ^~~~~~~~~~~~~~~~~~~
drivers/net/ipa/ipa_endpoint.c:1546:12: note: in expansion of macro 'GENMASK'
1546 |  tx_mask = GENMASK(max - 1, 0);
|            ^~~~~~~

vim +/ipa_endpoint_init_hdr +457 drivers/net/ipa/ipa_endpoint.c

   438	
   439	/**
   440	 * We program QMAP endpoints so each packet received is preceded by a QMAP
   441	 * header structure.  The QMAP header contains a 1-byte mux_id and 2-byte
   442	 * packet size field, and we have the IPA hardware populate both for each
   443	 * received packet.  The header is configured (in the HDR_EXT register)
   444	 * to use big endian format.
   445	 *
   446	 * The packet size is written into the QMAP header's pkt_len field.  That
   447	 * location is defined here using the HDR_OFST_PKT_SIZE field.
   448	 *
   449	 * The mux_id comes from a 4-byte metadata value supplied with each packet
   450	 * by the modem.  It is *not* a QMAP header, but it does contain the mux_id
   451	 * value that we want, in its low-order byte.  A bitmask defined in the
   452	 * endpoint's METADATA_MASK register defines which byte within the modem
   453	 * metadata contains the mux_id.  And the OFST_METADATA field programmed
   454	 * here indicates where the extracted byte should be placed within the QMAP
   455	 * header.
   456	 */
 > 457	void ipa_endpoint_init_hdr(struct ipa_endpoint *endpoint)
   458	{
   459		u32 offset = IPA_REG_ENDP_INIT_HDR_N_OFFSET(endpoint->endpoint_id);
   460		u32 val = 0;
   461	
   462		if (endpoint->data->qmap) {
   463			size_t header_size = sizeof(struct rmnet_map_header);
   464	
   465			/* We might supply a checksum header after the QMAP header */
   466			if (endpoint->toward_ipa && endpoint->data->checksum)
   467				header_size += sizeof(struct rmnet_map_ul_csum_header);
   468			val |= u32_encode_bits(header_size, HDR_LEN_FMASK);
   469	
   470			/* Define how to fill mux_id in a received QMAP header */
   471			if (!endpoint->toward_ipa) {
   472				u32 off;	/* Field offset within header */
   473	
   474				/* Where IPA will write the metadata value */
   475				off = offsetof(struct rmnet_map_header, mux_id);
   476				val |= u32_encode_bits(off, HDR_OFST_METADATA_FMASK);
   477	
   478				/* Where IPA will write the length */
   479				off = offsetof(struct rmnet_map_header, pkt_len);
   480				val |= HDR_OFST_PKT_SIZE_VALID_FMASK;
   481				val |= u32_encode_bits(off, HDR_OFST_PKT_SIZE_FMASK);
   482			}
   483			/* For QMAP TX, metadata offset is 0 (modem assumes this) */
   484			val |= HDR_OFST_METADATA_VALID_FMASK;
   485	
   486			/* HDR_ADDITIONAL_CONST_LEN is 0; (RX only) */
   487			/* HDR_A5_MUX is 0 */
   488			/* HDR_LEN_INC_DEAGG_HDR is 0 */
   489			/* HDR_METADATA_REG_VALID is 0 (TX only) */
   490		}
   491	
   492		iowrite32(val, endpoint->ipa->reg_virt + offset);
   493	}
   494	

---
0-DAY CI Kernel Test Service, Intel Corporation
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