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SubjectRe: [PATCH 3/7] net: thunderx: add multicast filter management support
Hi Vadim,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]
[also build test WARNING on v4.16-rc7 next-20180328]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Vadim-Lomovtsev/net-thunderx-implement-DMAC-filtering-support/20180328-190332
config: x86_64-randconfig-s1-03281908 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

All warnings (new ones prefixed by >>):

drivers/net/ethernet/cavium/thunder/thunder_bgx.c: In function 'bgx_lmac_save_filter':
>> drivers/net/ethernet/cavium/thunder/thunder_bgx.c:286:3: warning: 'return' with no value, in function returning non-void [-Wreturn-type]
return;
^~~~~~
drivers/net/ethernet/cavium/thunder/thunder_bgx.c:281:12: note: declared here
static int bgx_lmac_save_filter(struct lmac *lmac, u64 dmac, u8 vf_id)
^~~~~~~~~~~~~~~~~~~~
In file included from drivers/net/ethernet/cavium/thunder/nic.h:15:0,
from drivers/net/ethernet/cavium/thunder/thunder_bgx.c:21:
drivers/net/ethernet/cavium/thunder/thunder_bgx.c: In function 'bgx_set_dmac_cam_filter_mac':
>> drivers/net/ethernet/cavium/thunder/thunder_bgx.h:61:38: warning: left shift count >= width of type [-Wshift-count-overflow]
#define RX_DMACX_CAM_LMACID(x) (x << 49)
^
>> drivers/net/ethernet/cavium/thunder/thunder_bgx.c:324:8: note: in expansion of macro 'RX_DMACX_CAM_LMACID'
cfg = RX_DMACX_CAM_LMACID(lmacid & LMAC_ID_MASK) |
^~~~~~~~~~~~~~~~~~~

vim +/return +286 drivers/net/ethernet/cavium/thunder/thunder_bgx.c

280
> 281 static int bgx_lmac_save_filter(struct lmac *lmac, u64 dmac, u8 vf_id)
282 {
283 u8 i = 0;
284
285 if (!lmac)
> 286 return;
287
288 /* At the same time we could have several VFs 'attached' to some
289 * particular LMAC, and each VF is represented as network interface
290 * for kernel. So from user perspective it should be possible to
291 * manipulate with its' (VF) receive modes. However from PF
292 * driver perspective we need to keep track of filter configurations
293 * for different VFs to prevent filter values dupes
294 */
295 for (i = 0; i < lmac->dmacs_cfg; i++) {
296 if (lmac->dmacs[i].dmac == dmac) {
297 lmac->dmacs[i].vf_map |= BIT_ULL(vf_id);
298 return -1;
299 }
300 }
301
302 if (!(lmac->dmacs_cfg < lmac->dmacs_count))
303 return -1;
304
305 /* keep it for further tracking */
306 lmac->dmacs[lmac->dmacs_cfg].dmac = dmac;
307 lmac->dmacs[lmac->dmacs_cfg].vf_map = BIT_ULL(vf_id);
308 lmac->dmacs_cfg++;
309 return 0;
310 }
311
312 static int bgx_set_dmac_cam_filter_mac(struct bgx *bgx, int lmacid, u64 cam_dmac, u8 idx)
313 {
314 struct lmac *lmac = NULL;
315 u64 cfg = 0;
316
317 /* skip zero addresses as meaningless */
318 if (!cam_dmac || !bgx)
319 return -1;
320
321 lmac = &bgx->lmac[lmacid];
322
323 /* configure DCAM filtering for designated LMAC */
> 324 cfg = RX_DMACX_CAM_LMACID(lmacid & LMAC_ID_MASK) |
325 RX_DMACX_CAM_EN | cam_dmac;
326 bgx_reg_write(bgx, 0, BGX_CMR_RX_DMACX_CAM + ((lmacid * lmac->dmacs_count) + idx) * sizeof(u64), cfg);
327 return 0;
328 }
329

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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