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Message-ID: <AM5PR04MB3139BB2A930C4D7297FDA3348810A@AM5PR04MB3139.eurprd04.prod.outlook.com> Date: Fri, 11 Aug 2023 01:26:56 +0000 From: Wei Fang <wei.fang@....com> To: Jesper Dangaard Brouer <hawk@...nel.org>, "davem@...emloft.net" <davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>, Shenwei Wang <shenwei.wang@....com>, Clark Wang <xiaoning.wang@....com>, "ast@...nel.org" <ast@...nel.org>, "daniel@...earbox.net" <daniel@...earbox.net>, "john.fastabend@...il.com" <john.fastabend@...il.com>, "larysa.zaremba@...el.com" <larysa.zaremba@...el.com>, "aleksander.lobakin@...el.com" <aleksander.lobakin@...el.com>, "jbrouer@...hat.com" <jbrouer@...hat.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> CC: dl-linux-imx <linux-imx@....com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "bpf@...r.kernel.org" <bpf@...r.kernel.org> Subject: RE: [PATCH V5 net-next 1/2] net: fec: add XDP_TX feature support > If you add below code comment you can add my ACK in V6: > Okay, I will add the annotation to the code in V6. Thanks. > Acked-by: Jesper Dangaard Brouer <hawk@...nel.org> > > > @@ -1482,7 +1488,13 @@ fec_enet_tx_queue(struct net_device *ndev, > u16 queue_id, int budget) > > /* Free the sk buffer associated with this last transmit */ > > dev_kfree_skb_any(skb); > > } else { > > - xdp_return_frame(xdpf); > > + if (txq->tx_buf[index].type == FEC_TXBUF_T_XDP_NDO) { > > + xdp_return_frame_rx_napi(xdpf); > > + } else { > > + struct page *page = virt_to_head_page(xdpf->data); > > + > > I think this usage of page_pool_put_page() with dma_sync_size=0 requires a > comment, else we will forget why this okay... > I suggest: > > /* PP dma_sync_size=0 as xmit already synced DMA for_device */ > > > + page_pool_put_page(page->pp, page, 0, true); > > + } > > > > txq->tx_buf[index].xdp = NULL; > > /* restore default tx buffer type: FEC_TXBUF_T_SKB */ > @@ -1541,7
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