net: hns3: only support tc 0 for VF

Hello Yunsheng Lin,

The patch de67a690cc27: "net: hns3: only support tc 0 for VF" from Jan 31, 2019, leads to the following static checker warning:

	drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c:549 hclge_tm_vport_tc_info_update()
	warn: 'hdev->tm_info.pg_info[0]->bw_limit' 100000 can't fit into 65535 'vport->bw_limit'

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c

    534 	if (kinfo->req_rss_size != kinfo->rss_size && kinfo->req_rss_size &&
    535 	    kinfo->req_rss_size <= max_rss_size) {
    536 		dev_info(&hdev->pdev->dev, "rss changes from %d to %d\n",
    537 			 kinfo->rss_size, kinfo->req_rss_size);
    538 		kinfo->rss_size = kinfo->req_rss_size;
    539 	} else if (kinfo->rss_size > max_rss_size ||
    540 		   (!kinfo->req_rss_size && kinfo->rss_size < max_rss_size)) {
    541 		dev_info(&hdev->pdev->dev, "rss changes from %d to %d\n",
    542 			 kinfo->rss_size, max_rss_size);
    543 		kinfo->rss_size = max_rss_size;
    544 	}
    545 
    546 	kinfo->num_tqps = kinfo->num_tc * kinfo->rss_size;
    547 	vport->dwrr = 100;  /* 100 percent as init */
    548 	vport->alloc_rss_size = kinfo->rss_size;
--> 549 	vport->bw_limit = hdev->tm_info.pg_info[0].bw_limit;
                ^^^^^^^^^^^^^^^

An unsigned short is not large enough to hold HCLGE_ETHER_MAX_RATE (100000).

    550 
    551 	for (i = 0; i < HNAE3_MAX_TC; i++) {
    552 		if (hdev->hw_tc_map & BIT(i) && i < kinfo->num_tc) {
    553 			kinfo->tc_info[i].enable = true;
    554 			kinfo->tc_info[i].tqp_offset = i * kinfo->rss_size;
    555 			kinfo->tc_info[i].tqp_count = kinfo->rss_size;
    556 			kinfo->tc_info[i].tc = i;
    557 		} else {

regards,
dan carpenter

Hi,
Thanks for the report, will send a patch fix it.