Subject: Re: [net-next PATCH v5 6/6] octeontx2-pf: AF_XDP zero copy transmit support

From: kernel test robot <[email-masked]>
Date: Fri, 7 Feb 2025 19:40:10 +0800

Hi Suman,

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/Suman-Ghosh/octeontx2-pf-use-xdp_return_frame-to-free-xdp-buffers/20250206-165634
base:   net-next/main
patch link:    https://lore.kernel.org/r/20250206085034.1978172-7-sumang%40marvell.com
patch subject: [net-next PATCH v5 6/6] octeontx2-pf: AF_XDP zero copy transmit support
config: x86_64-buildonly-randconfig-006-20250207 (https://download.01.org/0day-ci/archive/20250207/[email-masked]/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250207/[email-masked]/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 <[email-masked]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/

All warnings (new ones prefixed by >>):

>> drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c:112:6: warning: variable 'iova' set but not used [-Wunused-but-set-variable]
     112 |         u64 iova;
         |             ^
   1 warning generated.

vim +/iova +112 drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c

   104	
   105	static void otx2_xdp_snd_pkt_handler(struct otx2_nic *pfvf,
   106					     struct otx2_snd_queue *sq,
   107					     struct nix_cqe_tx_s *cqe,
   108					     int *xsk_frames)
   109	{
   110		struct nix_send_comp_s *snd_comp = &cqe->comp;
   111		struct sg_list *sg;
 > 112		u64 iova;
   113	
   114		sg = &sq->sg[snd_comp->sqe_id];
   115	
   116		if (sg->flags & OTX2_AF_XDP_FRAME) {
   117			(*xsk_frames)++;
   118			return;
   119		}
   120	
   121		iova = sg->dma_addr[0];
   122		if (sg->flags & OTX2_XDP_REDIRECT)
   123			otx2_dma_unmap_page(pfvf, sg->dma_addr[0], sg->size[0], DMA_TO_DEVICE);
   124		xdp_return_frame((struct xdp_frame *)sg->skb);
   125		sg->skb = (u64)NULL;
   126	}
   127	

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