From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out30-119.freemail.mail.aliyun.com (out30-119.freemail.mail.aliyun.com [115.124.30.119]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 236E938396; Mon, 17 Jun 2024 07:53:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.119 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718610834; cv=none; b=EBtBXZvezf6R0UnnNG3036PseeShdPyql8idtQO1YUlW10zanOvMSRdgmnDayk5lhz9+sa0EGZh8EBV3N4eZ7ahH0tSZWi96ldmZdj3SYyRt8BgoFF9STO+p4xyzfBp9kuqvj0/tkPixgu7Q6h/Cji014igZxxrKT+mvVEf/Itg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718610834; c=relaxed/simple; bh=QZWLMROZJ6yMyPZMNTRw8uwJVgbM8CBulr5upUaL/1Q=; h=Message-ID:Subject:Date:From:To:Cc:References:In-Reply-To: Content-Type; b=gPGx9flMf0Lt+RJsjEMyGHa9IdHAWTZlObbYexTuO1o3feinb/2jvrZXaDWI6vbzqjupHfXhYxU7L3x8L0/LaV/2jcruCCjJZbK0oDpy0h11sNhX7sFgqj1eY0nozuwXQp8Dv+HijBVDSijTmwIvZ41zzjdNvpt7adVOrptyY5Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=c8rX5QaL; arc=none smtp.client-ip=115.124.30.119 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="c8rX5QaL" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1718610829; h=Message-ID:Subject:Date:From:To:Content-Type; bh=BOLIpsdx9COnZgmjEKNjHBVGCFu0GGUUJnuvMitqjF4=; b=c8rX5QaL0WCG0n/xgDcp0CmjDPR8cRuo3Asw3SAEdqo6PBInhxbphMDHBleUKCXpEWj2CKFI6A81zrmbYyozG7DsC36tKsNfik5gkzvOBAbPlGB8C1sWMS4McejbpFHBcKvvxQBnOBea41z5bW0/o1GoitytRDBIU5AEhxSiYkA= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R911e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037067109;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=14;SR=0;TI=SMTPD_---0W8aXrny_1718610828; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0W8aXrny_1718610828) by smtp.aliyun-inc.com; Mon, 17 Jun 2024 15:53:49 +0800 Message-ID: <1718610681.9219804-5-xuanzhuo@linux.alibaba.com> Subject: Re: [PATCH net-next v5 11/15] virtio_net: xsk: tx: support xmit xsk buffer Date: Mon, 17 Jun 2024 15:51:21 +0800 From: Xuan Zhuo To: Jason Wang Cc: netdev@vger.kernel.org, "Michael S. Tsirkin" , =?utf-8?q?Eugenio_P=C3=A9rez?= , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , virtualization@lists.linux.dev, bpf@vger.kernel.org References: <20240614063933.108811-1-xuanzhuo@linux.alibaba.com> <20240614063933.108811-12-xuanzhuo@linux.alibaba.com> In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: On Mon, 17 Jun 2024 14:30:07 +0800, Jason Wang wrote: > On Fri, Jun 14, 2024 at 2:40=E2=80=AFPM Xuan Zhuo wrote: > > > > The driver's tx napi is very important for XSK. It is responsible for > > obtaining data from the XSK queue and sending it out. > > > > At the beginning, we need to trigger tx napi. > > > > Signed-off-by: Xuan Zhuo > > --- > > drivers/net/virtio_net.c | 121 ++++++++++++++++++++++++++++++++++++++- > > 1 file changed, 119 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > > index 2767338dc060..7e811f392768 100644 > > --- a/drivers/net/virtio_net.c > > +++ b/drivers/net/virtio_net.c > > @@ -535,10 +535,13 @@ enum virtnet_xmit_type { > > VIRTNET_XMIT_TYPE_SKB, > > VIRTNET_XMIT_TYPE_XDP, > > VIRTNET_XMIT_TYPE_DMA, > > + VIRTNET_XMIT_TYPE_XSK, > > }; > > > > #define VIRTNET_XMIT_TYPE_MASK (VIRTNET_XMIT_TYPE_SKB | VIRTNET_XMIT_T= YPE_XDP \ > > - | VIRTNET_XMIT_TYPE_DMA) > > + | VIRTNET_XMIT_TYPE_DMA | VIRTNET_XMIT_= TYPE_XSK) > > + > > +#define VIRTIO_XSK_FLAG_OFFSET 4 > > > > static enum virtnet_xmit_type virtnet_xmit_ptr_strip(void **ptr) > > { > > @@ -768,6 +771,10 @@ static void __free_old_xmit(struct send_queue *sq,= bool in_napi, > > * func again. > > */ > > goto retry; > > + > > + case VIRTNET_XMIT_TYPE_XSK: > > + /* Make gcc happy. DONE in subsequent commit */ > > This is probably a hint that the next patch should be squashed here. The code for the xmit patch is more. So I separate the code out. > > > + break; > > } > > } > > } > > @@ -1265,6 +1272,102 @@ static void check_sq_full_and_disable(struct vi= rtnet_info *vi, > > } > > } > > > > +static void *virtnet_xsk_to_ptr(u32 len) > > +{ > > + unsigned long p; > > + > > + p =3D len << VIRTIO_XSK_FLAG_OFFSET; > > + > > + return virtnet_xmit_ptr_mix((void *)p, VIRTNET_XMIT_TYPE_XSK); > > +} > > + > > +static void sg_fill_dma(struct scatterlist *sg, dma_addr_t addr, u32 l= en) > > +{ > > + sg->dma_address =3D addr; > > + sg->length =3D len; > > +} > > + > > +static int virtnet_xsk_xmit_one(struct send_queue *sq, > > + struct xsk_buff_pool *pool, > > + struct xdp_desc *desc) > > +{ > > + struct virtnet_info *vi; > > + dma_addr_t addr; > > + > > + vi =3D sq->vq->vdev->priv; > > + > > + addr =3D xsk_buff_raw_get_dma(pool, desc->addr); > > + xsk_buff_raw_dma_sync_for_device(pool, addr, desc->len); > > + > > + sg_init_table(sq->sg, 2); > > + > > + sg_fill_dma(sq->sg, sq->xsk.hdr_dma_address, vi->hdr_len); > > + sg_fill_dma(sq->sg + 1, addr, desc->len); > > + > > + return virtqueue_add_outbuf(sq->vq, sq->sg, 2, > > + virtnet_xsk_to_ptr(desc->len), GFP_= ATOMIC); > > +} > > + > > +static int virtnet_xsk_xmit_batch(struct send_queue *sq, > > + struct xsk_buff_pool *pool, > > + unsigned int budget, > > + u64 *kicks) > > +{ > > + struct xdp_desc *descs =3D pool->tx_descs; > > + bool kick =3D false; > > + u32 nb_pkts, i; > > + int err; > > + > > + budget =3D min_t(u32, budget, sq->vq->num_free); > > + > > + nb_pkts =3D xsk_tx_peek_release_desc_batch(pool, budget); > > + if (!nb_pkts) > > + return 0; > > + > > + for (i =3D 0; i < nb_pkts; i++) { > > + err =3D virtnet_xsk_xmit_one(sq, pool, &descs[i]); > > + if (unlikely(err)) { > > + xsk_tx_completed(sq->xsk.pool, nb_pkts - i); > > + break; > > Any reason we don't need a kick here? After the loop, I checked the kick. Do you mean kick for the packet that encountered the error? > > > + } > > + > > + kick =3D true; > > + } > > + > > + if (kick && virtqueue_kick_prepare(sq->vq) && virtqueue_notify(= sq->vq)) > > + (*kicks)++; > > + > > + return i; > > +} > > + > > +static bool virtnet_xsk_xmit(struct send_queue *sq, struct xsk_buff_po= ol *pool, > > + int budget) > > +{ > > + struct virtnet_info *vi =3D sq->vq->vdev->priv; > > + struct virtnet_sq_free_stats stats =3D {}; > > + u64 kicks =3D 0; > > + int sent; > > + > > + __free_old_xmit(sq, true, &stats); > > + > > + sent =3D virtnet_xsk_xmit_batch(sq, pool, budget, &kicks); > > + > > + if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq)) > > + check_sq_full_and_disable(vi, vi->dev, sq); > > + > > + u64_stats_update_begin(&sq->stats.syncp); > > + u64_stats_add(&sq->stats.packets, stats.packets); > > + u64_stats_add(&sq->stats.bytes, stats.bytes); > > + u64_stats_add(&sq->stats.kicks, kicks); > > + u64_stats_add(&sq->stats.xdp_tx, sent); > > + u64_stats_update_end(&sq->stats.syncp); > > + > > + if (xsk_uses_need_wakeup(pool)) > > + xsk_set_tx_need_wakeup(pool); > > + > > + return sent =3D=3D budget; > > +} > > + > > static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, > > struct send_queue *sq, > > struct xdp_frame *xdpf) > > @@ -2707,6 +2810,7 @@ static int virtnet_poll_tx(struct napi_struct *na= pi, int budget) > > struct virtnet_info *vi =3D sq->vq->vdev->priv; > > unsigned int index =3D vq2txq(sq->vq); > > struct netdev_queue *txq; > > + bool xsk_busy =3D false; > > int opaque; > > bool done; > > > > @@ -2719,7 +2823,11 @@ static int virtnet_poll_tx(struct napi_struct *n= api, int budget) > > txq =3D netdev_get_tx_queue(vi->dev, index); > > __netif_tx_lock(txq, raw_smp_processor_id()); > > virtqueue_disable_cb(sq->vq); > > - free_old_xmit(sq, true); > > + > > + if (sq->xsk.pool) > > + xsk_busy =3D virtnet_xsk_xmit(sq, sq->xsk.pool, budget); > > How about rename this to "xsk_sent"? OK Thanks. > > > + else > > + free_old_xmit(sq, true); > > > > if (sq->vq->num_free >=3D 2 + MAX_SKB_FRAGS) { > > if (netif_tx_queue_stopped(txq)) { > > @@ -2730,6 +2838,11 @@ static int virtnet_poll_tx(struct napi_struct *n= api, int budget) > > netif_tx_wake_queue(txq); > > } > > > > + if (xsk_busy) { > > + __netif_tx_unlock(txq); > > + return budget; > > + } > > + > > opaque =3D virtqueue_enable_cb_prepare(sq->vq); > > > > done =3D napi_complete_done(napi, 0); > > @@ -5715,6 +5828,10 @@ static void virtnet_sq_free_unused_buf(struct vi= rtqueue *vq, void *buf) > > case VIRTNET_XMIT_TYPE_DMA: > > virtnet_sq_unmap(sq, &buf); > > goto retry; > > + > > + case VIRTNET_XMIT_TYPE_XSK: > > + /* Make gcc happy. DONE in subsequent commit */ > > + break; > > } > > } > > > > -- > > 2.32.0.3.g01195cf9f > > > > Thanks >