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Miller" , Eric Dumazet , "Jakub Kicinski" , Paolo Abeni , Jason Wang , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , "John Fastabend" , , Subject: Re: [PATCH net-next v2 16/21] virtio_net: xsk: rx: introduce add_recvbuf_xsk() Message-ID: References: <20231107031227.100015-1-xuanzhuo@linux.alibaba.com> <20231107031227.100015-17-xuanzhuo@linux.alibaba.com> <20231109031003-mutt-send-email-mst@kernel.org> <1699528306.7236402-5-xuanzhuo@linux.alibaba.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <1699528306.7236402-5-xuanzhuo@linux.alibaba.com> X-ClientProxiedBy: FR2P281CA0153.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:98::20) To DM4PR11MB6117.namprd11.prod.outlook.com (2603:10b6:8:b3::19) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB6117:EE_|PH0PR11MB4966:EE_ X-MS-Office365-Filtering-Correlation-Id: db97cdca-477d-4641-5b5a-08dbe140aacc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?r5z+ZsPs7pV2oYGqBrJhGTkPAWJjMM09S8atz+FentbHkbLg7EkJjmS2/K3A?= =?us-ascii?Q?KsNXLi6Kvwx3+e0DDtgIsZTPfjmfVViWSJy462bfjWqxjVWewirZoo1pNUoJ?= =?us-ascii?Q?gChdfTNN/oJ7BgLV29OL7FSxCAqXBptmwMqbKUlFlTNYUIMZRpo1SXzWaelr?= =?us-ascii?Q?mkG8PJ5V2qphrhO/YoOuKvOJkqu1l1WxRx1gT04UEtJ/Dz/xQh5/+u6yBIfd?= =?us-ascii?Q?DcAPh/tFcOUusC2FjIpdM7k4Kl6b6bY5A8NMgvmYpgUkjtcir4G6jO4irqIN?= =?us-ascii?Q?7No3l+9/upfksTf5EBAt7Af8znTGVNA1Y3iAN+DlwHCDXB7TjMNJig2rWJJq?= =?us-ascii?Q?r3ZIP92mqC2lnTRAntgDS1kKTXK94H4oCIXY2jOxjJO3MmAAZ3RHScL3LkPf?= =?us-ascii?Q?kP5jElKjabGY/jVQxlo3H3Kn6wNkExCt98xIaklD+001NvFqN/qCI01TOKRL?= =?us-ascii?Q?jzqpU16SnW0hS5L9T34NIujEfxO4hAEYD/1xgCcReEROYXymmQ680IFejGvv?= =?us-ascii?Q?wfD16mwbiGQzQNUuDvBqU01pHhzpM5ZHjJg4ez5WzjO9mYrSZi6U0+xIxqPp?= =?us-ascii?Q?QljU3iXggQCQKDoRcIaIEa239Xs0aA1mPekSR/L9CDK759trwsCH1216lNSN?= =?us-ascii?Q?PwmcQ/u6YwTF84hvFphiWbu0Tr4KR6Fq7dx4EFS7SxoobCibmX58wsr+TS5p?= =?us-ascii?Q?zMDUSxxmCBwwp/7Wpq1QuHyOlam0Q83RhTwPTDZWrZFnMh6criT7X1PwOdhc?= =?us-ascii?Q?ZAl9kIQI/gOTDlUDVBPCucPk3nrNs5aBkv/XXHYuHUPz0SEOBZzOPuYXRXT/?= =?us-ascii?Q?4PRJnyBMKZ2fOqr1PiJqr4yznlpWC6BQNWeuLz7IMwQ84L5BM9qTyvX8Lgxf?= =?us-ascii?Q?3OEZ6j9md7esI5niczo9kS8uh+D8+KhWquNtp7z3y6MqLCWqAW0MaiFq9pEP?= =?us-ascii?Q?dUKzoELSq1T2fxduv1QPU7im3Prg0nGMugmEXyowMV6e9CCA/BUgCPe/yQKo?= =?us-ascii?Q?DsJcAP3I2tDvRJUJ/+ZGUrgOGkkhPvehTUWttwlHIZa4PC7H9iYwOyzf1SVI?= =?us-ascii?Q?SkQ7cvsQWskVOTwy8oRgpgw1hD4nm8MS1HiXhIJfsLWYaZEcJ6mfWsv30N+N?= =?us-ascii?Q?3JXZicedZZwgR/ZFRtP4GtHMYT9xFwwJ4eps/nrrJpcVB9diXlk9I8C6nyWr?= =?us-ascii?Q?ujH8JrF1EIjHrjFglt6FS1nD5lDWZoYWt/TA5nbqeQplqzspsAIBV9BzLAFa?= =?us-ascii?Q?/SkpF70OPGUE9FSYI/aMmtBND54lr2ggKkxQVJUb+G6Fat8cSkIQLjy/D2Vj?= =?us-ascii?Q?+4MqTfSOsAP/IVe+wlpL4dcpceKMrevqweiQu0hHdzp2doDyOzuZ2JXYQHIB?= =?us-ascii?Q?CA8uN2/86voRXtibU+BP7sQ8UodKDbxl4tc5JW3hfIRiOgverPlzmz3igDMz?= =?us-ascii?Q?dVWQ2+dSee0sXEAv0nOGpebekBC2s4BBEdDnUzdg59sV1dz+6oEIxlDQf9/j?= =?us-ascii?Q?mtCmY3N147Hse1ahpA8lA25oRkIUJK5jF9mONL/MRXQ7JEgn7CUAhTNsUeKp?= =?us-ascii?Q?qMUG1lw2TkFmH/HESv1dSk8cSLjOGl2OvXwB5n4BiYMURNX4DzckVnVE6sPa?= =?us-ascii?Q?8A=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: db97cdca-477d-4641-5b5a-08dbe140aacc X-MS-Exchange-CrossTenant-AuthSource: DM4PR11MB6117.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Nov 2023 16:26:46.4642 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: hQdvU15PHPD5fFWfD0xTPG+cZoiK1f8Op1kBP6kDcTIMGuK9qr7rdluI+BfrmHvFfi9pYvgWh2SZnDal7WtYrDcDx5qxLaPqGU+Qqd6IYpA= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR11MB4966 X-OriginatorOrg: intel.com On Thu, Nov 09, 2023 at 07:11:46PM +0800, Xuan Zhuo wrote: > On Thu, 9 Nov 2023 03:12:27 -0500, "Michael S. Tsirkin" wrote: > > On Tue, Nov 07, 2023 at 11:12:22AM +0800, Xuan Zhuo wrote: > > > Implement the logic of filling rq with XSK buffers. > > > > > > Signed-off-by: Xuan Zhuo > > > --- > > > drivers/net/virtio/main.c | 4 ++- > > > drivers/net/virtio/virtio_net.h | 5 ++++ > > > drivers/net/virtio/xsk.c | 49 ++++++++++++++++++++++++++++++++- > > > drivers/net/virtio/xsk.h | 2 ++ > > > 4 files changed, 58 insertions(+), 2 deletions(-) > > > > > > diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c > > > index 6210a6e37396..15943a22e17d 100644 > > > --- a/drivers/net/virtio/main.c > > > +++ b/drivers/net/virtio/main.c > > > @@ -1798,7 +1798,9 @@ static bool try_fill_recv(struct virtnet_info *vi, struct virtnet_rq *rq, > > > bool oom; > > > > > > do { > > > - if (vi->mergeable_rx_bufs) > > > + if (rq->xsk.pool) > > > + err = virtnet_add_recvbuf_xsk(vi, rq, rq->xsk.pool, gfp); > > > + else if (vi->mergeable_rx_bufs) > > > err = add_recvbuf_mergeable(vi, rq, gfp); > > > else if (vi->big_packets) > > > err = add_recvbuf_big(vi, rq, gfp); > > > > I'm not sure I understand. How does this handle mergeable flag still being set? > > > You has the same question as Jason. > > So I think maybe I should put the handle into the > add_recvbuf_mergeable and add_recvbuf_small. > > Let me think about this. > > > > > > > > > diff --git a/drivers/net/virtio/virtio_net.h b/drivers/net/virtio/virtio_net.h > > > index a13d6d301fdb..1242785e311e 100644 > > > --- a/drivers/net/virtio/virtio_net.h > > > +++ b/drivers/net/virtio/virtio_net.h > > > @@ -140,6 +140,11 @@ struct virtnet_rq { > > > > > > /* xdp rxq used by xsk */ > > > struct xdp_rxq_info xdp_rxq; > > > + > > > + struct xdp_buff **xsk_buffs; > > > + u32 nxt_idx; > > > + u32 num; > > > + u32 size; > > > } xsk; > > > }; > > > > > > diff --git a/drivers/net/virtio/xsk.c b/drivers/net/virtio/xsk.c > > > index ea5804ddd44e..e737c3353212 100644 > > > --- a/drivers/net/virtio/xsk.c > > > +++ b/drivers/net/virtio/xsk.c > > > @@ -38,6 +38,41 @@ static void virtnet_xsk_check_queue(struct virtnet_sq *sq) > > > netif_stop_subqueue(dev, qnum); > > > } > > > > > > +int virtnet_add_recvbuf_xsk(struct virtnet_info *vi, struct virtnet_rq *rq, > > > + struct xsk_buff_pool *pool, gfp_t gfp) > > > +{ > > > + struct xdp_buff **xsk_buffs; > > > + dma_addr_t addr; > > > + u32 len, i; > > > + int err = 0; > > > + > > > + xsk_buffs = rq->xsk.xsk_buffs; > > > + > > > + if (rq->xsk.nxt_idx >= rq->xsk.num) { > > > + rq->xsk.num = xsk_buff_alloc_batch(pool, xsk_buffs, rq->xsk.size); > > > + if (!rq->xsk.num) > > > + return -ENOMEM; > > > + rq->xsk.nxt_idx = 0; > > > + } > > > > Another manually rolled linked list implementation. > > Please, don't. > > > The array is for speedup. > > xsk_buff_alloc_batch will return many xsk_buff that will be more efficient than > the xsk_buff_alloc. But your sg list just contains a single entry? I think that you have to walk through the xsk_buffs array, retrieve dma addrs from there and have sg list sized to the value xsk_buff_alloc_batch() returned. I don't think your logic based on nxt_idx is needed. Please take a look how other drivers use xsk_buff_alloc_batch(). I don't see callsites of virtnet_add_recvbuf_xsk() though. > > Thanks. > > > > > > > > + > > > + i = rq->xsk.nxt_idx; > > > + > > > + /* use the part of XDP_PACKET_HEADROOM as the virtnet hdr space */ > > > + addr = xsk_buff_xdp_get_dma(xsk_buffs[i]) - vi->hdr_len; > > > + len = xsk_pool_get_rx_frame_size(pool) + vi->hdr_len; > > > + > > > + sg_init_table(rq->sg, 1); > > > + sg_fill_dma(rq->sg, addr, len); > > > + > > > + err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, xsk_buffs[i], gfp); > > > + if (err) > > > + return err; > > > + > > > + rq->xsk.nxt_idx++; > > > + > > > + return 0; > > > +} > > > + > > > static int virtnet_xsk_xmit_one(struct virtnet_sq *sq, > > > struct xsk_buff_pool *pool, > > > struct xdp_desc *desc) > > > @@ -213,7 +248,7 @@ static int virtnet_xsk_pool_enable(struct net_device *dev, > > > struct virtnet_sq *sq; > > > struct device *dma_dev; > > > dma_addr_t hdr_dma; > > > - int err; > > > + int err, size; > > > > > > /* In big_packets mode, xdp cannot work, so there is no need to > > > * initialize xsk of rq. > > > @@ -249,6 +284,16 @@ static int virtnet_xsk_pool_enable(struct net_device *dev, > > > if (!dma_dev) > > > return -EPERM; > > > > > > + size = virtqueue_get_vring_size(rq->vq); > > > + > > > + rq->xsk.xsk_buffs = kcalloc(size, sizeof(*rq->xsk.xsk_buffs), GFP_KERNEL); > > > + if (!rq->xsk.xsk_buffs) > > > + return -ENOMEM; > > > + > > > + rq->xsk.size = size; > > > + rq->xsk.nxt_idx = 0; > > > + rq->xsk.num = 0; > > > + > > > hdr_dma = dma_map_single(dma_dev, &xsk_hdr, vi->hdr_len, DMA_TO_DEVICE); > > > if (dma_mapping_error(dma_dev, hdr_dma)) > > > return -ENOMEM; > > > @@ -307,6 +352,8 @@ static int virtnet_xsk_pool_disable(struct net_device *dev, u16 qid) > > > > > > dma_unmap_single(dma_dev, sq->xsk.hdr_dma_address, vi->hdr_len, DMA_TO_DEVICE); > > > > > > + kfree(rq->xsk.xsk_buffs); > > > + > > > return err1 | err2; > > > } > > > > > > diff --git a/drivers/net/virtio/xsk.h b/drivers/net/virtio/xsk.h > > > index 7ebc9bda7aee..bef41a3f954e 100644 > > > --- a/drivers/net/virtio/xsk.h > > > +++ b/drivers/net/virtio/xsk.h > > > @@ -23,4 +23,6 @@ int virtnet_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp); > > > bool virtnet_xsk_xmit(struct virtnet_sq *sq, struct xsk_buff_pool *pool, > > > int budget); > > > int virtnet_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag); > > > +int virtnet_add_recvbuf_xsk(struct virtnet_info *vi, struct virtnet_rq *rq, > > > + struct xsk_buff_pool *pool, gfp_t gfp); > > > #endif > > > -- > > > 2.32.0.3.g01195cf9f > > > > >