From nobody Thu Nov 14 04:54:31 2024 Received: from szxga06-in.huawei.com (szxga06-in.huawei.com [45.249.212.32]) (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 B15495D8F9; Tue, 23 Jan 2024 10:44:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.32 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706006684; cv=none; b=WkrjquOdVS8mASe2z+GO3yz8sDMeSbNORBdxfzjfDWq3L3V3Vb9ATCRDw9uspGdOrbPblf04u20NzgEZfoZC3uafpqPKFOfgI+gwKdHS+DLxlYvgxoPw8qrRjsDisrXSEPDPr3IgsznfNyisQL4blVDNYgikyLsR/pknrbwR0RY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706006684; c=relaxed/simple; bh=EkOVPmyG8AwI1ztH4WPEnwo5N1dm4jflvATq8fvXt7Q=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=BVfmewf1jWaKcHr4QVyXGuDjDw84eMN6IQatHhBdcu98KgQtC5tWdNjRUJw3emNb0tEffnU4bjkHtSDdz7ApEDNqe20SGkPu1/I9HsclWxhq7AhIYQjJuK8hHhT7b4k/E1MlzeQ+GkeumBAVu/3wjAZTH/ayFnSHDOL5I40epOM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.162.112]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4TK3cD0jRxz1vsXm; Tue, 23 Jan 2024 18:44:12 +0800 (CST) Received: from dggpemm500005.china.huawei.com (unknown [7.185.36.74]) by mail.maildlp.com (Postfix) with ESMTPS id BB2491400DD; Tue, 23 Jan 2024 18:44:18 +0800 (CST) Received: from localhost.localdomain (10.69.192.56) by dggpemm500005.china.huawei.com (7.185.36.74) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Tue, 23 Jan 2024 18:43:40 +0800 From: Yunsheng Lin To: , , CC: , , Yunsheng Lin , Jason Wang , "Michael S. Tsirkin" , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , , , Subject: [PATCH net-next v3 4/5] vhost/net: remove vhost_net_page_frag_refill() Date: Tue, 23 Jan 2024 18:42:49 +0800 Message-ID: <20240123104250.9103-5-linyunsheng@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20240123104250.9103-1-linyunsheng@huawei.com> References: <20240123104250.9103-1-linyunsheng@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggpemm500005.china.huawei.com (7.185.36.74) Content-Type: text/plain; charset="utf-8" The page frag in vhost_net_page_frag_refill() uses the 'struct page_frag' from skb_page_frag_refill(), but it's implementation is similar to page_frag_alloc_align() now. This patch removes vhost_net_page_frag_refill() by using 'struct page_frag_cache' instead of 'struct page_frag', and allocating frag using page_frag_alloc_align(). The added benefit is that not only unifying the page frag implementation a little, but also having about 0.5% performance boost testing by using the vhost_net_test introduced in the last patch. Signed-off-by: Yunsheng Lin Acked-by: Jason Wang --- drivers/vhost/net.c | 91 ++++++++++++++------------------------------- 1 file changed, 27 insertions(+), 64 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index e574e21cc0ca..4b2fcb228a0a 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -141,10 +141,8 @@ struct vhost_net { unsigned tx_zcopy_err; /* Flush in progress. Protected by tx vq lock. */ bool tx_flush; - /* Private page frag */ - struct page_frag page_frag; - /* Refcount bias of page frag */ - int refcnt_bias; + /* Private page frag cache */ + struct page_frag_cache pf_cache; }; =20 static unsigned vhost_net_zcopy_mask __read_mostly; @@ -655,41 +653,6 @@ static bool tx_can_batch(struct vhost_virtqueue *vq, s= ize_t total_len) !vhost_vq_avail_empty(vq->dev, vq); } =20 -static bool vhost_net_page_frag_refill(struct vhost_net *net, unsigned int= sz, - struct page_frag *pfrag, gfp_t gfp) -{ - if (pfrag->page) { - if (pfrag->offset + sz <=3D pfrag->size) - return true; - __page_frag_cache_drain(pfrag->page, net->refcnt_bias); - } - - pfrag->offset =3D 0; - net->refcnt_bias =3D 0; - if (SKB_FRAG_PAGE_ORDER) { - /* Avoid direct reclaim but allow kswapd to wake */ - pfrag->page =3D alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | - __GFP_COMP | __GFP_NOWARN | - __GFP_NORETRY | __GFP_NOMEMALLOC, - SKB_FRAG_PAGE_ORDER); - if (likely(pfrag->page)) { - pfrag->size =3D PAGE_SIZE << SKB_FRAG_PAGE_ORDER; - goto done; - } - } - pfrag->page =3D alloc_page(gfp); - if (likely(pfrag->page)) { - pfrag->size =3D PAGE_SIZE; - goto done; - } - return false; - -done: - net->refcnt_bias =3D USHRT_MAX; - page_ref_add(pfrag->page, USHRT_MAX - 1); - return true; -} - #define VHOST_NET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) =20 static int vhost_net_build_xdp(struct vhost_net_virtqueue *nvq, @@ -699,7 +662,6 @@ static int vhost_net_build_xdp(struct vhost_net_virtque= ue *nvq, struct vhost_net *net =3D container_of(vq->dev, struct vhost_net, dev); struct socket *sock =3D vhost_vq_get_backend(vq); - struct page_frag *alloc_frag =3D &net->page_frag; struct virtio_net_hdr *gso; struct xdp_buff *xdp =3D &nvq->xdp[nvq->batched_xdp]; struct tun_xdp_hdr *hdr; @@ -710,6 +672,7 @@ static int vhost_net_build_xdp(struct vhost_net_virtque= ue *nvq, int sock_hlen =3D nvq->sock_hlen; void *buf; int copied; + int ret; =20 if (unlikely(len < nvq->sock_hlen)) return -EFAULT; @@ -719,18 +682,17 @@ static int vhost_net_build_xdp(struct vhost_net_virtq= ueue *nvq, return -ENOSPC; =20 buflen +=3D SKB_DATA_ALIGN(len + pad); - alloc_frag->offset =3D ALIGN((u64)alloc_frag->offset, SMP_CACHE_BYTES); - if (unlikely(!vhost_net_page_frag_refill(net, buflen, - alloc_frag, GFP_KERNEL))) + buf =3D page_frag_alloc_align(&net->pf_cache, buflen, GFP_KERNEL, + SMP_CACHE_BYTES); + if (unlikely(!buf)) return -ENOMEM; =20 - buf =3D (char *)page_address(alloc_frag->page) + alloc_frag->offset; - copied =3D copy_page_from_iter(alloc_frag->page, - alloc_frag->offset + - offsetof(struct tun_xdp_hdr, gso), - sock_hlen, from); - if (copied !=3D sock_hlen) - return -EFAULT; + copied =3D copy_from_iter(buf + offsetof(struct tun_xdp_hdr, gso), + sock_hlen, from); + if (copied !=3D sock_hlen) { + ret =3D -EFAULT; + goto err; + } =20 hdr =3D buf; gso =3D &hdr->gso; @@ -743,27 +705,30 @@ static int vhost_net_build_xdp(struct vhost_net_virtq= ueue *nvq, vhost16_to_cpu(vq, gso->csum_start) + vhost16_to_cpu(vq, gso->csum_offset) + 2); =20 - if (vhost16_to_cpu(vq, gso->hdr_len) > len) - return -EINVAL; + if (vhost16_to_cpu(vq, gso->hdr_len) > len) { + ret =3D -EINVAL; + goto err; + } } =20 len -=3D sock_hlen; - copied =3D copy_page_from_iter(alloc_frag->page, - alloc_frag->offset + pad, - len, from); - if (copied !=3D len) - return -EFAULT; + copied =3D copy_from_iter(buf + pad, len, from); + if (copied !=3D len) { + ret =3D -EFAULT; + goto err; + } =20 xdp_init_buff(xdp, buflen, NULL); xdp_prepare_buff(xdp, buf, pad, len, true); hdr->buflen =3D buflen; =20 - --net->refcnt_bias; - alloc_frag->offset +=3D buflen; - ++nvq->batched_xdp; =20 return 0; + +err: + page_frag_free(buf); + return ret; } =20 static void handle_tx_copy(struct vhost_net *net, struct socket *sock) @@ -1353,8 +1318,7 @@ static int vhost_net_open(struct inode *inode, struct= file *f) vqs[VHOST_NET_VQ_RX]); =20 f->private_data =3D n; - n->page_frag.page =3D NULL; - n->refcnt_bias =3D 0; + n->pf_cache.va =3D NULL; =20 return 0; } @@ -1422,8 +1386,7 @@ static int vhost_net_release(struct inode *inode, str= uct file *f) kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue); kfree(n->vqs[VHOST_NET_VQ_TX].xdp); kfree(n->dev.vqs); - if (n->page_frag.page) - __page_frag_cache_drain(n->page_frag.page, n->refcnt_bias); + page_frag_cache_drain(&n->pf_cache); kvfree(n); return 0; } --=20 2.33.0