From patchwork Tue Feb 13 16:59:22 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jesper Dangaard Brouer X-Patchwork-Id: 872994 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3zgpg03y8Bz9t3h for ; Wed, 14 Feb 2018 03:59:40 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965300AbeBMQ7a (ORCPT ); Tue, 13 Feb 2018 11:59:30 -0500 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:58850 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S964863AbeBMQ70 (ORCPT ); Tue, 13 Feb 2018 11:59:26 -0500 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B18634022909; Tue, 13 Feb 2018 16:59:25 +0000 (UTC) Received: from firesoul.localdomain (ovpn-200-22.brq.redhat.com [10.40.200.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4FD9C10073DA; Tue, 13 Feb 2018 16:59:23 +0000 (UTC) Received: from [192.168.42.3] (localhost [IPv6:::1]) by firesoul.localdomain (Postfix) with ESMTP id 44D4630736C72; Tue, 13 Feb 2018 17:59:22 +0100 (CET) Subject: [net PATCH] Revert "net: thunderx: Add support for xdp redirect" From: Jesper Dangaard Brouer To: netdev@vger.kernel.org Cc: Sunil Goutham , Aleksey Makarov , Alexei Starovoitov , Christina Jacob , Jesper Dangaard Brouer , Daniel Borkmann , "David S. Miller" , linux-arm-kernel@lists.infradead.org Date: Tue, 13 Feb 2018 17:59:22 +0100 Message-ID: <151854116184.18303.13476104443853509134.stgit@firesoul> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Tue, 13 Feb 2018 16:59:25 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Tue, 13 Feb 2018 16:59:25 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'brouer@redhat.com' RCPT:'' Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This reverts commit aa136d0c82fcd6af14535853c30e219e02b2692d. As I previously[1] pointed out this implementation of XDP_REDIRECT is wrong. XDP_REDIRECT is a facility that must work between different NIC drivers. Another NIC driver can call ndo_xdp_xmit/nicvf_xdp_xmit, but your driver patch assumes payload data (at top of page) will contain a queue index and a DMA addr, this is not true and worse will likely contain garbage. Given you have not fixed this in due time (just reached v4.16-rc1), the only option I see is a revert. [1] http://lkml.kernel.org/r/20171211130902.482513d3@redhat.com Cc: Sunil Goutham Cc: Christina Jacob Cc: Aleksey Makarov Fixes: aa136d0c82fc ("net: thunderx: Add support for xdp redirect") Signed-off-by: Jesper Dangaard Brouer --- drivers/net/ethernet/cavium/thunder/nicvf_main.c | 110 +++++--------------- drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 11 +- drivers/net/ethernet/cavium/thunder/nicvf_queues.h | 4 - 3 files changed, 31 insertions(+), 94 deletions(-) diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c index b68cde9f17d2..7d9c5ffbd041 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c +++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c @@ -67,11 +67,6 @@ module_param(cpi_alg, int, S_IRUGO); MODULE_PARM_DESC(cpi_alg, "PFC algorithm (0=none, 1=VLAN, 2=VLAN16, 3=IP Diffserv)"); -struct nicvf_xdp_tx { - u64 dma_addr; - u8 qidx; -}; - static inline u8 nicvf_netdev_qidx(struct nicvf *nic, u8 qidx) { if (nic->sqs_mode) @@ -507,29 +502,14 @@ static int nicvf_init_resources(struct nicvf *nic) return 0; } -static void nicvf_unmap_page(struct nicvf *nic, struct page *page, u64 dma_addr) -{ - /* Check if it's a recycled page, if not unmap the DMA mapping. - * Recycled page holds an extra reference. - */ - if (page_ref_count(page) == 1) { - dma_addr &= PAGE_MASK; - dma_unmap_page_attrs(&nic->pdev->dev, dma_addr, - RCV_FRAG_LEN + XDP_HEADROOM, - DMA_FROM_DEVICE, - DMA_ATTR_SKIP_CPU_SYNC); - } -} - static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog, struct cqe_rx_t *cqe_rx, struct snd_queue *sq, struct rcv_queue *rq, struct sk_buff **skb) { struct xdp_buff xdp; struct page *page; - struct nicvf_xdp_tx *xdp_tx = NULL; u32 action; - u16 len, err, offset = 0; + u16 len, offset = 0; u64 dma_addr, cpu_addr; void *orig_data; @@ -543,7 +523,7 @@ static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog, cpu_addr = (u64)phys_to_virt(cpu_addr); page = virt_to_page((void *)cpu_addr); - xdp.data_hard_start = page_address(page) + RCV_BUF_HEADROOM; + xdp.data_hard_start = page_address(page); xdp.data = (void *)cpu_addr; xdp_set_data_meta_invalid(&xdp); xdp.data_end = xdp.data + len; @@ -563,7 +543,18 @@ static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog, switch (action) { case XDP_PASS: - nicvf_unmap_page(nic, page, dma_addr); + /* Check if it's a recycled page, if not + * unmap the DMA mapping. + * + * Recycled page holds an extra reference. + */ + if (page_ref_count(page) == 1) { + dma_addr &= PAGE_MASK; + dma_unmap_page_attrs(&nic->pdev->dev, dma_addr, + RCV_FRAG_LEN + XDP_PACKET_HEADROOM, + DMA_FROM_DEVICE, + DMA_ATTR_SKIP_CPU_SYNC); + } /* Build SKB and pass on packet to network stack */ *skb = build_skb(xdp.data, @@ -576,20 +567,6 @@ static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog, case XDP_TX: nicvf_xdp_sq_append_pkt(nic, sq, (u64)xdp.data, dma_addr, len); return true; - case XDP_REDIRECT: - /* Save DMA address for use while transmitting */ - xdp_tx = (struct nicvf_xdp_tx *)page_address(page); - xdp_tx->dma_addr = dma_addr; - xdp_tx->qidx = nicvf_netdev_qidx(nic, cqe_rx->rq_idx); - - err = xdp_do_redirect(nic->pnicvf->netdev, &xdp, prog); - if (!err) - return true; - - /* Free the page on error */ - nicvf_unmap_page(nic, page, dma_addr); - put_page(page); - break; default: bpf_warn_invalid_xdp_action(action); /* fall through */ @@ -597,7 +574,18 @@ static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog, trace_xdp_exception(nic->netdev, prog, action); /* fall through */ case XDP_DROP: - nicvf_unmap_page(nic, page, dma_addr); + /* Check if it's a recycled page, if not + * unmap the DMA mapping. + * + * Recycled page holds an extra reference. + */ + if (page_ref_count(page) == 1) { + dma_addr &= PAGE_MASK; + dma_unmap_page_attrs(&nic->pdev->dev, dma_addr, + RCV_FRAG_LEN + XDP_PACKET_HEADROOM, + DMA_FROM_DEVICE, + DMA_ATTR_SKIP_CPU_SYNC); + } put_page(page); return true; } @@ -1864,50 +1852,6 @@ static int nicvf_xdp(struct net_device *netdev, struct netdev_bpf *xdp) } } -static int nicvf_xdp_xmit(struct net_device *netdev, struct xdp_buff *xdp) -{ - struct nicvf *nic = netdev_priv(netdev); - struct nicvf *snic = nic; - struct nicvf_xdp_tx *xdp_tx; - struct snd_queue *sq; - struct page *page; - int err, qidx; - - if (!netif_running(netdev) || !nic->xdp_prog) - return -EINVAL; - - page = virt_to_page(xdp->data); - xdp_tx = (struct nicvf_xdp_tx *)page_address(page); - qidx = xdp_tx->qidx; - - if (xdp_tx->qidx >= nic->xdp_tx_queues) - return -EINVAL; - - /* Get secondary Qset's info */ - if (xdp_tx->qidx >= MAX_SND_QUEUES_PER_QS) { - qidx = xdp_tx->qidx / MAX_SND_QUEUES_PER_QS; - snic = (struct nicvf *)nic->snicvf[qidx - 1]; - if (!snic) - return -EINVAL; - qidx = xdp_tx->qidx % MAX_SND_QUEUES_PER_QS; - } - - sq = &snic->qs->sq[qidx]; - err = nicvf_xdp_sq_append_pkt(snic, sq, (u64)xdp->data, - xdp_tx->dma_addr, - xdp->data_end - xdp->data); - if (err) - return -ENOMEM; - - nicvf_xdp_sq_doorbell(snic, sq, qidx); - return 0; -} - -static void nicvf_xdp_flush(struct net_device *dev) -{ - return; -} - static int nicvf_config_hwtstamp(struct net_device *netdev, struct ifreq *ifr) { struct hwtstamp_config config; @@ -1986,8 +1930,6 @@ static const struct net_device_ops nicvf_netdev_ops = { .ndo_fix_features = nicvf_fix_features, .ndo_set_features = nicvf_set_features, .ndo_bpf = nicvf_xdp, - .ndo_xdp_xmit = nicvf_xdp_xmit, - .ndo_xdp_flush = nicvf_xdp_flush, .ndo_do_ioctl = nicvf_ioctl, }; diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c index 3eae9ff9b53a..d42704d07484 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c +++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c @@ -204,7 +204,7 @@ static inline int nicvf_alloc_rcv_buffer(struct nicvf *nic, struct rbdr *rbdr, /* Reserve space for header modifications by BPF program */ if (rbdr->is_xdp) - buf_len += XDP_HEADROOM; + buf_len += XDP_PACKET_HEADROOM; /* Check if it's recycled */ if (pgcache) @@ -224,9 +224,8 @@ static inline int nicvf_alloc_rcv_buffer(struct nicvf *nic, struct rbdr *rbdr, nic->rb_page = NULL; return -ENOMEM; } - if (pgcache) - pgcache->dma_addr = *rbuf + XDP_HEADROOM; + pgcache->dma_addr = *rbuf + XDP_PACKET_HEADROOM; nic->rb_page_offset += buf_len; } @@ -1244,7 +1243,7 @@ int nicvf_xdp_sq_append_pkt(struct nicvf *nic, struct snd_queue *sq, int qentry; if (subdesc_cnt > sq->xdp_free_cnt) - return -1; + return 0; qentry = nicvf_get_sq_desc(sq, subdesc_cnt); @@ -1255,7 +1254,7 @@ int nicvf_xdp_sq_append_pkt(struct nicvf *nic, struct snd_queue *sq, sq->xdp_desc_cnt += subdesc_cnt; - return 0; + return 1; } /* Calculate no of SQ subdescriptors needed to transmit all @@ -1656,7 +1655,7 @@ static void nicvf_unmap_rcv_buffer(struct nicvf *nic, u64 dma_addr, if (page_ref_count(page) != 1) return; - len += XDP_HEADROOM; + len += XDP_PACKET_HEADROOM; /* Receive buffers in XDP mode are mapped from page start */ dma_addr &= PAGE_MASK; } diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h index ce1eed7a6d63..5e9a03cf1b4d 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h +++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h @@ -11,7 +11,6 @@ #include #include -#include #include #include "q_struct.h" @@ -94,9 +93,6 @@ #define RCV_FRAG_LEN (SKB_DATA_ALIGN(DMA_BUFFER_LEN + NET_SKB_PAD) + \ SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) -#define RCV_BUF_HEADROOM 128 /* To store dma address for XDP redirect */ -#define XDP_HEADROOM (XDP_PACKET_HEADROOM + RCV_BUF_HEADROOM) - #define MAX_CQES_FOR_TX ((SND_QUEUE_LEN / MIN_SQ_DESC_PER_PKT_XMIT) * \ MAX_CQE_PER_PKT_XMIT)