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[2a03:2880:30ff:2::face:b00c]) by smtp.gmail.com with ESMTPSA id bf17-20020a0564021a5100b0056bf6287f32sm5488953edb.26.2024.04.22.05.39.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Apr 2024 05:39:53 -0700 (PDT) From: Breno Leitao To: aleksander.lobakin@intel.com, kuba@kernel.org, davem@davemloft.net, pabeni@redhat.com, edumazet@google.com, elder@kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, nbd@nbd.name, sean.wang@mediatek.com, Mark-MC.Lee@mediatek.com, lorenzo@kernel.org, taras.chornyi@plvision.eu, ath11k@lists.infradead.org, ath10k@lists.infradead.org, linux-wireless@vger.kernel.org, geomatsi@gmail.com, kvalo@kernel.org, Matthias Brugger , AngeloGioacchino Del Regno , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend Cc: quic_jjohnson@quicinc.com, leon@kernel.org, dennis.dalessandro@cornelisnetworks.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, idosch@idosch.org, leitao@debian.org Subject: [PATCH net-next v7 05/10] net: mediatek: mtk_eth_sock: allocate dummy net_device dynamically Date: Mon, 22 Apr 2024 05:38:58 -0700 Message-ID: <20240422123921.854943-6-leitao@debian.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240422123921.854943-1-leitao@debian.org> References: <20240422123921.854943-1-leitao@debian.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org Embedding net_device into structures prohibits the usage of flexible arrays in the net_device structure. For more details, see the discussion at [1]. Un-embed the net_device from the private struct by converting it into a pointer. Then use the leverage the new alloc_netdev_dummy() helper to allocate and initialize dummy devices. [1] https://lore.kernel.org/all/20240229225910.79e224cf@kernel.org/ Signed-off-by: Breno Leitao --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 17 +++++++++++++---- drivers/net/ethernet/mediatek/mtk_eth_soc.h | 2 +- 2 files changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index caa13b9cedff..d7a96dc11c07 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -1710,7 +1710,7 @@ static struct page_pool *mtk_create_page_pool(struct mtk_eth *eth, if (IS_ERR(pp)) return pp; - err = __xdp_rxq_info_reg(xdp_q, ð->dummy_dev, id, + err = __xdp_rxq_info_reg(xdp_q, eth->dummy_dev, id, eth->rx_napi.napi_id, PAGE_SIZE); if (err < 0) goto err_free_pp; @@ -4188,6 +4188,8 @@ static int mtk_free_dev(struct mtk_eth *eth) metadata_dst_free(eth->dsa_meta[i]); } + free_netdev(eth->dummy_dev); + return 0; } @@ -4983,9 +4985,14 @@ static int mtk_probe(struct platform_device *pdev) /* we run 2 devices on the same DMA ring so we need a dummy device * for NAPI to work */ - init_dummy_netdev(ð->dummy_dev); - netif_napi_add(ð->dummy_dev, ð->tx_napi, mtk_napi_tx); - netif_napi_add(ð->dummy_dev, ð->rx_napi, mtk_napi_rx); + eth->dummy_dev = alloc_netdev_dummy(0); + if (!eth->dummy_dev) { + err = -ENOMEM; + dev_err(eth->dev, "failed to allocated dummy device\n"); + goto err_unreg_netdev; + } + netif_napi_add(eth->dummy_dev, ð->tx_napi, mtk_napi_tx); + netif_napi_add(eth->dummy_dev, ð->rx_napi, mtk_napi_rx); platform_set_drvdata(pdev, eth); schedule_delayed_work(ð->reset.monitor_work, @@ -4993,6 +5000,8 @@ static int mtk_probe(struct platform_device *pdev) return 0; +err_unreg_netdev: + mtk_unreg_dev(eth); err_deinit_ppe: mtk_ppe_deinit(eth); mtk_mdio_cleanup(eth); diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h index 9ae3b8a71d0e..723fc637027c 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h @@ -1242,7 +1242,7 @@ struct mtk_eth { spinlock_t page_lock; spinlock_t tx_irq_lock; spinlock_t rx_irq_lock; - struct net_device dummy_dev; + struct net_device *dummy_dev; struct net_device *netdev[MTK_MAX_DEVS]; struct mtk_mac *mac[MTK_MAX_DEVS]; int irq[3];