Re: [PATCH v4 3/4] drivers/net/virtio_net: Added RSS hash report.

[Michael S. Tsirkin]

On Wed, Feb 23, 2022 at 03:15:28AM +0800, kernel test robot wrote:
> Hi Andrew,
> 
> Thank you for the patch! Perhaps something to improve:
> 
> [auto build test WARNING on mst-vhost/linux-next]
> [also build test WARNING on net/master horms-ipvs/master net-next/master linus/master v5.17-rc5 next-20220217]
> [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]


Andrew,
do you plan to fix this?

> url:    https://github.com/0day-ci/linux/commits/Andrew-Melnychenko/RSS-support-for-VirtioNet/20220222-200334
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
> config: i386-randconfig-s002-20220221 (https://download.01.org/0day-ci/archive/20220223/202202230342.HPYe6dHA-lkp@xxxxxxxxx/config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> reproduce:
>         # apt-get install sparse
>         # sparse version: v0.6.4-dirty
>         # https://github.com/0day-ci/linux/commit/4fda71c17afd24d8afb675baa0bb14dbbc6cd23c
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Andrew-Melnychenko/RSS-support-for-VirtioNet/20220222-200334
>         git checkout 4fda71c17afd24d8afb675baa0bb14dbbc6cd23c
>         # save the config file to linux build tree
>         mkdir build_dir
>         make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> 
> 
> sparse warnings: (new ones prefixed by >>)
>    drivers/net/virtio_net.c:1160:25: sparse: sparse: restricted __le16 degrades to integer
>    drivers/net/virtio_net.c:1160:25: sparse: sparse: restricted __le16 degrades to integer
>    drivers/net/virtio_net.c:1160:25: sparse: sparse: restricted __le16 degrades to integer
>    drivers/net/virtio_net.c:1160:25: sparse: sparse: restricted __le16 degrades to integer
>    drivers/net/virtio_net.c:1160:25: sparse: sparse: restricted __le16 degrades to integer
>    drivers/net/virtio_net.c:1160:25: sparse: sparse: restricted __le16 degrades to integer
>    drivers/net/virtio_net.c:1160:25: sparse: sparse: restricted __le16 degrades to integer
>    drivers/net/virtio_net.c:1160:25: sparse: sparse: restricted __le16 degrades to integer
>    drivers/net/virtio_net.c:1160:25: sparse: sparse: restricted __le16 degrades to integer
> >> drivers/net/virtio_net.c:1178:35: sparse: sparse: incorrect type in argument 2 (different base types) @@     expected unsigned int [usertype] hash @@     got restricted __le32 const [usertype] hash_value @@
>    drivers/net/virtio_net.c:1178:35: sparse:     expected unsigned int [usertype] hash
>    drivers/net/virtio_net.c:1178:35: sparse:     got restricted __le32 const [usertype] hash_value
> 
> vim +1178 drivers/net/virtio_net.c
> 
>   1151	
>   1152	static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash,
>   1153					struct sk_buff *skb)
>   1154	{
>   1155		enum pkt_hash_types rss_hash_type;
>   1156	
>   1157		if (!hdr_hash || !skb)
>   1158			return;
>   1159	
>   1160		switch (hdr_hash->hash_report) {
>   1161		case VIRTIO_NET_HASH_REPORT_TCPv4:
>   1162		case VIRTIO_NET_HASH_REPORT_UDPv4:
>   1163		case VIRTIO_NET_HASH_REPORT_TCPv6:
>   1164		case VIRTIO_NET_HASH_REPORT_UDPv6:
>   1165		case VIRTIO_NET_HASH_REPORT_TCPv6_EX:
>   1166		case VIRTIO_NET_HASH_REPORT_UDPv6_EX:
>   1167			rss_hash_type = PKT_HASH_TYPE_L4;
>   1168			break;
>   1169		case VIRTIO_NET_HASH_REPORT_IPv4:
>   1170		case VIRTIO_NET_HASH_REPORT_IPv6:
>   1171		case VIRTIO_NET_HASH_REPORT_IPv6_EX:
>   1172			rss_hash_type = PKT_HASH_TYPE_L3;
>   1173			break;
>   1174		case VIRTIO_NET_HASH_REPORT_NONE:
>   1175		default:
>   1176			rss_hash_type = PKT_HASH_TYPE_NONE;
>   1177		}
> > 1178		skb_set_hash(skb, hdr_hash->hash_value, rss_hash_type);
>   1179	}
>   1180	
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx