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X-CSE-ConnectionGUID: qIjkV5gaQDCooxB3e9hyZA== X-CSE-MsgGUID: 6AJ4i5j/THWZUWOHSnkneg== X-IronPort-AV: E=McAfee;i="6800,10657,11536"; a="68931474" X-IronPort-AV: E=Sophos;i="6.18,217,1751266800"; d="scan'208";a="68931474" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by orvoesa103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Aug 2025 06:33:52 -0700 X-CSE-ConnectionGUID: 1Hc75nYBSkK9n4PttD9Ldw== X-CSE-MsgGUID: 6UDgdak0TXaK542KPB7y/A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.18,217,1751266800"; d="scan'208";a="170503715" Received: from lkp-server02.sh.intel.com (HELO 4ea60e6ab079) ([10.239.97.151]) by fmviesa009.fm.intel.com with ESMTP; 28 Aug 2025 06:33:50 -0700 Received: from kbuild by 4ea60e6ab079 with local (Exim 4.96) (envelope-from ) id 1urckM-000Tk3-14; Thu, 28 Aug 2025 13:33:07 +0000 Date: Thu, 28 Aug 2025 21:32:03 +0800 From: kernel test robot To: oe-kbuild@lists.linux.dev Cc: lkp@intel.com, Dan Carpenter Subject: Re: [PATCH net-next 03/11] virtio_net: Create virtio_net directory Message-ID: <202508282144.Y9qC4URI-lkp@intel.com> Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev In-Reply-To: <20250827183852.2471-4-danielj@nvidia.com> References: <20250827183852.2471-4-danielj@nvidia.com> TO: Daniel Jurgens TO: netdev@vger.kernel.org TO: mst@redhat.com TO: jasowang@redhat.com TO: alex.williamson@redhat.com TO: virtualization@lists.linux.dev TO: pabeni@redhat.com CC: parav@nvidia.com CC: shshitrit@nvidia.com CC: yohadt@nvidia.com CC: Daniel Jurgens Hi Daniel, kernel test robot noticed the following build warnings: [auto build test WARNING on net-next/main] url: https://github.com/intel-lab-lkp/linux/commits/Daniel-Jurgens/virtio-pci-Expose-generic-device-capability-operations/20250828-024128 base: net-next/main patch link: https://lore.kernel.org/r/20250827183852.2471-4-danielj%40nvidia.com patch subject: [PATCH net-next 03/11] virtio_net: Create virtio_net directory :::::: branch date: 19 hours ago :::::: commit date: 19 hours ago config: x86_64-randconfig-r073-20250828 (https://download.01.org/0day-ci/archive/20250828/202508282144.Y9qC4URI-lkp@intel.com/config) compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0 If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202508282144.Y9qC4URI-lkp@intel.com/ smatch warnings: drivers/net/virtio_net/virtio_net_main.c:2188 build_skb_from_xdp_buff() error: uninitialized symbol 'nr_frags'. drivers/net/virtio_net/virtio_net_main.c:2262 virtnet_build_xdp_buff_mrg() error: uninitialized symbol 'shinfo'. drivers/net/virtio_net/virtio_net_main.c:3187 virtnet_update_settings() error: uninitialized symbol 'virtio_cread_v'. drivers/net/virtio_net/virtio_net_main.c:6279 virtnet_config_changed_work() error: uninitialized symbol 'virtio_cread_v'. drivers/net/virtio_net/virtio_net_main.c:6283 virtnet_config_changed_work() error: uninitialized symbol 'v'. vim +/nr_frags +2188 drivers/net/virtio_net/virtio_net_main.c 80f50f918c6e2d drivers/net/virtio_net.c Xuan Zhuo 2023-05-08 2146 b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2147 /* Why not use xdp_build_skb_from_frame() ? b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2148 * XDP core assumes that xdp frags are PAGE_SIZE in length, while in b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2149 * virtio-net there are 2 points that do not match its requirements: b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2150 * 1. The size of the prefilled buffer is not fixed before xdp is set. b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2151 * 2. xdp_build_skb_from_frame() does more checks that we don't need, b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2152 * like eth_type_trans() (which virtio-net does in receive_buf()). b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2153 */ b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2154 static struct sk_buff *build_skb_from_xdp_buff(struct net_device *dev, b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2155 struct virtnet_info *vi, b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2156 struct xdp_buff *xdp, b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2157 unsigned int xdp_frags_truesz) b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2158 { b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2159 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2160 unsigned int headroom, data_len; b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2161 struct sk_buff *skb; b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2162 int metasize; b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2163 u8 nr_frags; b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2164 b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2165 if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) { b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2166 pr_debug("Error building skb as missing reserved tailroom for xdp"); b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2167 return NULL; b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2168 } b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2169 b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2170 if (unlikely(xdp_buff_has_frags(xdp))) b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2171 nr_frags = sinfo->nr_frags; b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2172 b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2173 skb = build_skb(xdp->data_hard_start, xdp->frame_sz); b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2174 if (unlikely(!skb)) b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2175 return NULL; b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2176 b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2177 headroom = xdp->data - xdp->data_hard_start; b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2178 data_len = xdp->data_end - xdp->data; b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2179 skb_reserve(skb, headroom); b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2180 __skb_put(skb, data_len); b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2181 b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2182 metasize = xdp->data - xdp->data_meta; b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2183 metasize = metasize > 0 ? metasize : 0; b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2184 if (metasize) b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2185 skb_metadata_set(skb, metasize); b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2186 b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2187 if (unlikely(xdp_buff_has_frags(xdp))) b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 @2188 xdp_update_skb_shared_info(skb, nr_frags, b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2189 sinfo->xdp_frags_size, b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2190 xdp_frags_truesz, b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2191 xdp_buff_is_frag_pfmemalloc(xdp)); b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2192 b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2193 return skb; b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2194 } b26aa481b4b710 drivers/net/virtio_net.c Heng Qi 2023-01-14 2195 ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2196 /* TODO: build xdp in big mode */ ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2197 static int virtnet_build_xdp_buff_mrg(struct net_device *dev, ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2198 struct virtnet_info *vi, ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2199 struct receive_queue *rq, ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2200 struct xdp_buff *xdp, ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2201 void *buf, ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2202 unsigned int len, ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2203 unsigned int frame_sz, 981f14d42a7f16 drivers/net/virtio_net.c Heng Qi 2023-01-31 2204 int *num_buf, ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2205 unsigned int *xdp_frags_truesize, ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2206 struct virtnet_rq_stats *stats) ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2207 { ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2208 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2209 struct skb_shared_info *shinfo; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2210 unsigned int xdp_frags_truesz = 0; 4be2193b3393dc drivers/net/virtio_net.c Bui Quang Minh 2025-06-30 2211 unsigned int truesize; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2212 struct page *page; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2213 skb_frag_t *frag; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2214 int offset; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2215 void *ctx; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2216 ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2217 xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq); 41d4a174201e62 drivers/net/virtio_net.c Xuan Zhuo 2024-07-08 2218 xdp_prepare_buff(xdp, buf - XDP_PACKET_HEADROOM, 41d4a174201e62 drivers/net/virtio_net.c Xuan Zhuo 2024-07-08 2219 XDP_PACKET_HEADROOM + vi->hdr_len, len - vi->hdr_len, true); ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2220 981f14d42a7f16 drivers/net/virtio_net.c Heng Qi 2023-01-31 2221 if (!*num_buf) 981f14d42a7f16 drivers/net/virtio_net.c Heng Qi 2023-01-31 2222 return 0; 981f14d42a7f16 drivers/net/virtio_net.c Heng Qi 2023-01-31 2223 ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2224 if (*num_buf > 1) { ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2225 /* If we want to build multi-buffer xdp, we need ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2226 * to specify that the flags of xdp_buff have the ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2227 * XDP_FLAGS_HAS_FRAG bit. ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2228 */ ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2229 if (!xdp_buff_has_frags(xdp)) ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2230 xdp_buff_set_frags_flag(xdp); ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2231 ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2232 shinfo = xdp_get_shared_info_from_buff(xdp); ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2233 shinfo->nr_frags = 0; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2234 shinfo->xdp_frags_size = 0; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2235 } ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2236 981f14d42a7f16 drivers/net/virtio_net.c Heng Qi 2023-01-31 2237 if (*num_buf > MAX_SKB_FRAGS + 1) ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2238 return -EINVAL; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2239 981f14d42a7f16 drivers/net/virtio_net.c Heng Qi 2023-01-31 2240 while (--*num_buf > 0) { 295525e29a5b56 drivers/net/virtio_net.c Xuan Zhuo 2023-08-10 2241 buf = virtnet_rq_get_buf(rq, &len, &ctx); ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2242 if (unlikely(!buf)) { ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2243 pr_debug("%s: rx error: %d buffers out of %d missing\n", ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2244 dev->name, *num_buf, ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2245 virtio16_to_cpu(vi->vdev, hdr->num_buffers)); d12a26b74fb774 drivers/net/virtio_net.c Eric Dumazet 2023-09-21 2246 DEV_STATS_INC(dev, rx_length_errors); 4cb00b13c06408 drivers/net/virtio_net.c Xuan Zhuo 2023-05-08 2247 goto err; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2248 } ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2249 61217d8f636043 drivers/net/virtio_net.c Eric Dumazet 2023-10-26 2250 u64_stats_add(&stats->bytes, len); ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2251 page = virt_to_head_page(buf); ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2252 offset = buf - page_address(page); ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2253 7d4a119e45828e drivers/net/virtio_net.c Bui Quang Minh 2025-06-30 2254 if (check_mergeable_len(dev, ctx, len)) { ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2255 put_page(page); 4cb00b13c06408 drivers/net/virtio_net.c Xuan Zhuo 2023-05-08 2256 goto err; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2257 } ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2258 7d4a119e45828e drivers/net/virtio_net.c Bui Quang Minh 2025-06-30 2259 truesize = mergeable_ctx_to_truesize(ctx); 7d4a119e45828e drivers/net/virtio_net.c Bui Quang Minh 2025-06-30 2260 xdp_frags_truesz += truesize; 7d4a119e45828e drivers/net/virtio_net.c Bui Quang Minh 2025-06-30 2261 ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 @2262 frag = &shinfo->frags[shinfo->nr_frags++]; b51f4113ebb020 drivers/net/virtio_net.c Yunsheng Lin 2023-05-11 2263 skb_frag_fill_page_desc(frag, page, offset, len); ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2264 if (page_is_pfmemalloc(page)) ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2265 xdp_buff_set_frag_pfmemalloc(xdp); ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2266 ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2267 shinfo->xdp_frags_size += len; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2268 } ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2269 ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2270 *xdp_frags_truesize = xdp_frags_truesz; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2271 return 0; 4cb00b13c06408 drivers/net/virtio_net.c Xuan Zhuo 2023-05-08 2272 4cb00b13c06408 drivers/net/virtio_net.c Xuan Zhuo 2023-05-08 2273 err: 4cb00b13c06408 drivers/net/virtio_net.c Xuan Zhuo 2023-05-08 2274 put_xdp_frags(xdp); 4cb00b13c06408 drivers/net/virtio_net.c Xuan Zhuo 2023-05-08 2275 return -EINVAL; ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2276 } ef75cb51f13941 drivers/net/virtio_net.c Heng Qi 2023-01-14 2277 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki