Subject: Re: [PATCH bpf-next] xsk: allow remap of fill and/or completion rings

From: kernel test robot <[email-masked]>
Date: Tue, 21 Mar 2023 04:24:10 +0800

Hi Nuno,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Nuno-Gon-alves/xsk-allow-remap-of-fill-and-or-completion-rings/20230320-190022
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20230320105323.187307-1-nunog%40fr24.com
patch subject: [PATCH bpf-next] xsk: allow remap of fill and/or completion rings
config: i386-randconfig-a004 (https://download.01.org/0day-ci/archive/20230321/[email-masked]/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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
        # https://github.com/intel-lab-lkp/linux/commit/56f6a0c68dd5f4419fd7685cc83ceee2c70f3f2e
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Nuno-Gon-alves/xsk-allow-remap-of-fill-and-or-completion-rings/20230320-190022
        git checkout 56f6a0c68dd5f4419fd7685cc83ceee2c70f3f2e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email-masked]>
| Link: https://lore.kernel.org/oe-kbuild-all/[email-masked]/

All errors (new ones prefixed by >>):

>> net/xdp/xsk.c:1303:24: error: use of undeclared identifier 'xs'
           int state = READ_ONCE(xs->state);
                                 ^
>> net/xdp/xsk.c:1303:24: error: use of undeclared identifier 'xs'
>> net/xdp/xsk.c:1303:24: error: use of undeclared identifier 'xs'
>> net/xdp/xsk.c:1303:24: error: use of undeclared identifier 'xs'
>> net/xdp/xsk.c:1303:24: error: use of undeclared identifier 'xs'
>> net/xdp/xsk.c:1303:24: error: use of undeclared identifier 'xs'
>> net/xdp/xsk.c:1303:24: error: use of undeclared identifier 'xs'
>> net/xdp/xsk.c:1303:6: error: initializing 'int' with an expression of incompatible type 'void'
           int state = READ_ONCE(xs->state);
               ^       ~~~~~~~~~~~~~~~~~~~~
>> net/xdp/xsk.c:1318:8: error: cannot take the address of an rvalue of type 'struct xsk_queue *'
                           q = READ_ONCE(state == XSK_READY ? xs->fq_tmp :
                               ^         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:50:2: note: expanded from macro 'READ_ONCE'
           __READ_ONCE(x);                                                 \
           ^           ~
   include/asm-generic/rwonce.h:44:70: note: expanded from macro '__READ_ONCE'
   #define __READ_ONCE(x)  (*(const volatile __unqual_scalar_typeof(x) *)&(x))
                                                                         ^ ~
   net/xdp/xsk.c:1321:8: error: cannot take the address of an rvalue of type 'struct xsk_queue *'
                           q = READ_ONCE(state == XSK_READY ? xs->cq_tmp :
                               ^         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:50:2: note: expanded from macro 'READ_ONCE'
           __READ_ONCE(x);                                                 \
           ^           ~
   include/asm-generic/rwonce.h:44:70: note: expanded from macro '__READ_ONCE'
   #define __READ_ONCE(x)  (*(const volatile __unqual_scalar_typeof(x) *)&(x))
                                                                         ^ ~
   10 errors generated.

vim +/xs +1303 net/xdp/xsk.c

  1297	
  1298	static int xsk_mmap(struct file *file, struct socket *sock,
  1299			    struct vm_area_struct *vma)
  1300	{
  1301		loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
  1302		unsigned long size = vma->vm_end - vma->vm_start;
> 1303		int state = READ_ONCE(xs->state);
  1304		struct xdp_sock *xs = xdp_sk(sock->sk);
  1305		struct xsk_queue *q = NULL;
  1306	
  1307		if (!(state == XSK_READY || state == XSK_BOUND))
  1308			return -EBUSY;
  1309	
  1310		if (offset == XDP_PGOFF_RX_RING) {
  1311			q = READ_ONCE(xs->rx);
  1312		} else if (offset == XDP_PGOFF_TX_RING) {
  1313			q = READ_ONCE(xs->tx);
  1314		} else {
  1315			/* Matches the smp_wmb() in XDP_UMEM_REG */
  1316			smp_rmb();
  1317			if (offset == XDP_UMEM_PGOFF_FILL_RING)
> 1318				q = READ_ONCE(state == XSK_READY ? xs->fq_tmp :
  1319								   xs->pool->fq);
  1320			else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING)
  1321				q = READ_ONCE(state == XSK_READY ? xs->cq_tmp :
  1322								   xs->pool->cq);
  1323		}
  1324	
  1325		if (!q)
  1326			return -EINVAL;
  1327	
  1328		/* Matches the smp_wmb() in xsk_init_queue */
  1329		smp_rmb();
  1330		if (size > q->ring_vmalloc_size)
  1331			return -EINVAL;
  1332	
  1333		return remap_vmalloc_range(vma, q->ring, 0);
  1334	}
  1335	

-- 
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https://github.com/intel/lkp-tests