Re: [PATCH V7 net] net: mana: Fix MANA VF unload when hardware is

[kernel test robot <lkp@intel.com>]

Hi Souradeep,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Souradeep-Chakrabarti/net-mana-Fix-MANA-VF-unload-when-hardware-is/20230801-203141
base:   net/main
patch link:    https://lore.kernel.org/r/1690892953-25201-1-git-send-email-schakrabarti%40linux.microsoft.com
patch subject: [PATCH V7 net] net: mana: Fix MANA VF unload when hardware is
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20230802/202308021532.8iYkExDh-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230802/202308021532.8iYkExDh-lkp@intel.com/reproduce)

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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308021532.8iYkExDh-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/net/ethernet/microsoft/mana/mana_en.c: In function 'mana_dealloc_queues':
>> drivers/net/ethernet/microsoft/mana/mana_en.c:2398:24: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    2398 |                 while (skb = skb_dequeue(&txq->pending_skbs)) {
         |                        ^~~


vim +2398 drivers/net/ethernet/microsoft/mana/mana_en.c

  2345	
  2346	static int mana_dealloc_queues(struct net_device *ndev)
  2347	{
  2348		struct mana_port_context *apc = netdev_priv(ndev);
  2349		unsigned long timeout = jiffies + 120 * HZ;
  2350		struct gdma_dev *gd = apc->ac->gdma_dev;
  2351		struct mana_txq *txq;
  2352		struct sk_buff *skb;
  2353		int i, err;
  2354		u32 tsleep;
  2355	
  2356		if (apc->port_is_up)
  2357			return -EINVAL;
  2358	
  2359		mana_chn_setxdp(apc, NULL);
  2360	
  2361		if (gd->gdma_context->is_pf)
  2362			mana_pf_deregister_filter(apc);
  2363	
  2364		/* No packet can be transmitted now since apc->port_is_up is false.
  2365		 * There is still a tiny chance that mana_poll_tx_cq() can re-enable
  2366		 * a txq because it may not timely see apc->port_is_up being cleared
  2367		 * to false, but it doesn't matter since mana_start_xmit() drops any
  2368		 * new packets due to apc->port_is_up being false.
  2369		 *
  2370		 * Drain all the in-flight TX packets.
  2371		 * A timeout of 120 seconds for all the queues is used.
  2372		 * This will break the while loop when h/w is not responding.
  2373		 * This value of 120 has been decided here considering max
  2374		 * number of queues.
  2375		 */
  2376	
  2377		for (i = 0; i < apc->num_queues; i++) {
  2378			txq = &apc->tx_qp[i].txq;
  2379			tsleep = 1000;
  2380			while (atomic_read(&txq->pending_sends) > 0 &&
  2381			       time_before(jiffies, timeout)) {
  2382				usleep_range(tsleep, tsleep + 1000);
  2383				tsleep <<= 1;
  2384			}
  2385			if (atomic_read(&txq->pending_sends)) {
  2386				err = pcie_flr(to_pci_dev(gd->gdma_context->dev));
  2387				if (err) {
  2388					netdev_err(ndev, "flr failed %d with %d pkts pending in txq %u\n",
  2389						   err, atomic_read(&txq->pending_sends),
  2390						   txq->gdma_txq_id);
  2391				}
  2392				break;
  2393			}
  2394		}
  2395	
  2396		for (i = 0; i < apc->num_queues; i++) {
  2397			txq = &apc->tx_qp[i].txq;
> 2398			while (skb = skb_dequeue(&txq->pending_skbs)) {
  2399				mana_unmap_skb(skb, apc);
  2400				dev_consume_skb_any(skb);
  2401			}
  2402			atomic_set(&txq->pending_sends, 0);
  2403		}
  2404		/* We're 100% sure the queues can no longer be woken up, because
  2405		 * we're sure now mana_poll_tx_cq() can't be running.
  2406		 */
  2407	
  2408		apc->rss_state = TRI_STATE_FALSE;
  2409		err = mana_config_rss(apc, TRI_STATE_FALSE, false, false);
  2410		if (err) {
  2411			netdev_err(ndev, "Failed to disable vPort: %d\n", err);
  2412			return err;
  2413		}
  2414	
  2415		mana_destroy_vport(apc);
  2416	
  2417		return 0;
  2418	}
  2419	

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