xsk: Fix umem fill/completion queue mmap on 32-bit

With gcc-4.1.2 on 32-bit:

    net/xdp/xsk.c:663: warning: integer constant is too large for ‘long’ type
    net/xdp/xsk.c:665: warning: integer constant is too large for ‘long’ type

Add the missing "ULL" suffixes to the large XDP_UMEM_PGOFF_*_RING values
to fix this.

    net/xdp/xsk.c:663: warning: comparison is always false due to limited range of data type
    net/xdp/xsk.c:665: warning: comparison is always false due to limited range of data type

"unsigned long" is 32-bit on 32-bit systems, hence the offset is
truncated, and can never be equal to any of the XDP_UMEM_PGOFF_*_RING
values.  Use loff_t (and the required cast) to fix this.

Fixes: 423f3832 ("xsk: add umem fill queue support and mmap")
Fixes: fe230832 ("xsk: add umem completion queue support and mmap")
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Acked-by: NBjörn Töpel <bjorn.topel@intel.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>

include/uapi/linux/if_xdp.h

@@ -63,8 +63,8 @@ struct xdp_statistics {
 /* Pgoff for mmaping the rings */
 #define XDP_PGOFF_RX_RING			  0
 #define XDP_PGOFF_TX_RING		 0x80000000
-#define XDP_UMEM_PGOFF_FILL_RING	0x100000000
-#define XDP_UMEM_PGOFF_COMPLETION_RING	0x180000000
+#define XDP_UMEM_PGOFF_FILL_RING	0x100000000ULL
+#define XDP_UMEM_PGOFF_COMPLETION_RING	0x180000000ULL
 
 /* Rx/Tx descriptor */
 struct xdp_desc {

net/xdp/xsk.c

@@ -643,7 +643,7 @@ static int xsk_getsockopt(struct socket *sock, int level, int optname,
 static int xsk_mmap(struct file *file, struct socket *sock,
 		    struct vm_area_struct *vma)
 {
-	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
+	loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
 	unsigned long size = vma->vm_end - vma->vm_start;
 	struct xdp_sock *xs = xdp_sk(sock->sk);
 	struct xsk_queue *q = NULL;