[PATCH net-next v3] net: axienet: Use NAPI for TX completion path

[kernel test robot]

Hi Robert,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Robert-Hancock/net-axienet-Use-NAPI-for-TX-completion-path/20220506-043932
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 1c1ed5a48411e1686997157c21633653fbe045c6
config: x86_64-randconfig-c007 (https://download.01.org/0day-ci/archive/20220506/202205060910.pO104P2e-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 5e004fb787698440a387750db7f8028e7cb14cfc)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/89eb9e692229a3af81eaf2f599781bfae3091e93
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Robert-Hancock/net-axienet-Use-NAPI-for-TX-completion-path/20220506-043932
        git checkout 89eb9e692229a3af81eaf2f599781bfae3091e93
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/ethernet/xilinx/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> drivers/net/ethernet/xilinx/xilinx_axienet_main.c:765: warning: expecting prototype for axienet_start_xmit_done(). Prototype was for axienet_tx_poll() instead


vim +765 drivers/net/ethernet/xilinx/xilinx_axienet_main.c

bb193e3db8b86a Robert Hancock  2022-01-18  749  
ab365c3393664f Andre Przywara  2020-03-24  750  /**
ab365c3393664f Andre Przywara  2020-03-24  751   * axienet_start_xmit_done - Invoked once a transmit is completed by the
ab365c3393664f Andre Przywara  2020-03-24  752   * Axi DMA Tx channel.
89eb9e692229a3 Robert Hancock  2022-05-05  753   * @napi:	Pointer to NAPI structure.
89eb9e692229a3 Robert Hancock  2022-05-05  754   * @budget:	Max number of TX packets to process.
89eb9e692229a3 Robert Hancock  2022-05-05  755   *
89eb9e692229a3 Robert Hancock  2022-05-05  756   * Return: Number of TX packets processed.
ab365c3393664f Andre Przywara  2020-03-24  757   *
89eb9e692229a3 Robert Hancock  2022-05-05  758   * This function is invoked from the NAPI processing to notify the completion
ab365c3393664f Andre Przywara  2020-03-24  759   * of transmit operation. It clears fields in the corresponding Tx BDs and
ab365c3393664f Andre Przywara  2020-03-24  760   * unmaps the corresponding buffer so that CPU can regain ownership of the
ab365c3393664f Andre Przywara  2020-03-24  761   * buffer. It finally invokes "netif_wake_queue" to restart transmission if
ab365c3393664f Andre Przywara  2020-03-24  762   * required.
ab365c3393664f Andre Przywara  2020-03-24  763   */
89eb9e692229a3 Robert Hancock  2022-05-05  764  static int axienet_tx_poll(struct napi_struct *napi, int budget)
ab365c3393664f Andre Przywara  2020-03-24 @765  {
89eb9e692229a3 Robert Hancock  2022-05-05  766  	struct axienet_local *lp = container_of(napi, struct axienet_local, napi_tx);
89eb9e692229a3 Robert Hancock  2022-05-05  767  	struct net_device *ndev = lp->ndev;
ab365c3393664f Andre Przywara  2020-03-24  768  	u32 size = 0;
89eb9e692229a3 Robert Hancock  2022-05-05  769  	int packets;
ab365c3393664f Andre Przywara  2020-03-24  770  
89eb9e692229a3 Robert Hancock  2022-05-05  771  	packets = axienet_free_tx_chain(lp, lp->tx_bd_ci, budget, false, &size, budget);
ab365c3393664f Andre Przywara  2020-03-24  772  
89eb9e692229a3 Robert Hancock  2022-05-05  773  	if (packets) {
ab365c3393664f Andre Przywara  2020-03-24  774  		lp->tx_bd_ci += packets;
ab365c3393664f Andre Przywara  2020-03-24  775  		if (lp->tx_bd_ci >= lp->tx_bd_num)
89eb9e692229a3 Robert Hancock  2022-05-05  776  			lp->tx_bd_ci %= lp->tx_bd_num;
ab365c3393664f Andre Przywara  2020-03-24  777  
8a3b7a252dca9f Daniel Borkmann 2012-01-19  778  		ndev->stats.tx_packets += packets;
8a3b7a252dca9f Daniel Borkmann 2012-01-19  779  		ndev->stats.tx_bytes += size;
7de44285c1f69c Robert Hancock  2019-06-06  780  
7de44285c1f69c Robert Hancock  2019-06-06  781  		/* Matches barrier in axienet_start_xmit */
7de44285c1f69c Robert Hancock  2019-06-06  782  		smp_mb();
7de44285c1f69c Robert Hancock  2019-06-06  783  
bb193e3db8b86a Robert Hancock  2022-01-18  784  		if (!axienet_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1))
8a3b7a252dca9f Daniel Borkmann 2012-01-19  785  			netif_wake_queue(ndev);
8a3b7a252dca9f Daniel Borkmann 2012-01-19  786  	}
8a3b7a252dca9f Daniel Borkmann 2012-01-19  787  
89eb9e692229a3 Robert Hancock  2022-05-05  788  	if (packets < budget && napi_complete_done(napi, packets)) {
89eb9e692229a3 Robert Hancock  2022-05-05  789  		/* Re-enable TX completion interrupts. This should
89eb9e692229a3 Robert Hancock  2022-05-05  790  		 * cause an immediate interrupt if any TX packets are
89eb9e692229a3 Robert Hancock  2022-05-05  791  		 * already pending.
89eb9e692229a3 Robert Hancock  2022-05-05  792  		 */
89eb9e692229a3 Robert Hancock  2022-05-05  793  		axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, lp->tx_dma_cr);
89eb9e692229a3 Robert Hancock  2022-05-05  794  	}
89eb9e692229a3 Robert Hancock  2022-05-05  795  	return packets;
89eb9e692229a3 Robert Hancock  2022-05-05  796  }
89eb9e692229a3 Robert Hancock  2022-05-05  797  

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