From patchwork Mon Dec 7 16:32:35 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 11956343 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.2 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 62D2BC433FE for ; Mon, 7 Dec 2020 16:34:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 37EAD238EA for ; Mon, 7 Dec 2020 16:34:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727434AbgLGQeQ (ORCPT ); Mon, 7 Dec 2020 11:34:16 -0500 Received: from mail.kernel.org ([198.145.29.99]:32812 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727132AbgLGQeQ (ORCPT ); Mon, 7 Dec 2020 11:34:16 -0500 From: Lorenzo Bianconi Authentication-Results: mail.kernel.org; dkim=permerror (bad message/signature format) To: bpf@vger.kernel.org, netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net, shayagr@amazon.com, sameehj@amazon.com, john.fastabend@gmail.com, dsahern@kernel.org, brouer@redhat.com, echaudro@redhat.com, lorenzo.bianconi@redhat.com, jasowang@redhat.com Subject: [PATCH v5 bpf-next 06/14] net: mvneta: add multi buffer support to XDP_TX Date: Mon, 7 Dec 2020 17:32:35 +0100 Message-Id: X-Mailer: git-send-email 2.28.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Introduce the capability to map non-linear xdp buffer running mvneta_xdp_submit_frame() for XDP_TX and XDP_REDIRECT Signed-off-by: Lorenzo Bianconi --- drivers/net/ethernet/marvell/mvneta.c | 94 ++++++++++++++++----------- 1 file changed, 56 insertions(+), 38 deletions(-) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index bac1ae7014eb..dc1f1f25fce0 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -1857,8 +1857,8 @@ static void mvneta_txq_bufs_free(struct mvneta_port *pp, bytes_compl += buf->skb->len; pkts_compl++; dev_kfree_skb_any(buf->skb); - } else if (buf->type == MVNETA_TYPE_XDP_TX || - buf->type == MVNETA_TYPE_XDP_NDO) { + } else if ((buf->type == MVNETA_TYPE_XDP_TX || + buf->type == MVNETA_TYPE_XDP_NDO) && buf->xdpf) { if (napi && buf->type == MVNETA_TYPE_XDP_TX) xdp_return_frame_rx_napi(buf->xdpf); else @@ -2054,45 +2054,64 @@ mvneta_xdp_put_buff(struct mvneta_port *pp, struct mvneta_rx_queue *rxq, static int mvneta_xdp_submit_frame(struct mvneta_port *pp, struct mvneta_tx_queue *txq, - struct xdp_frame *xdpf, bool dma_map) + struct xdp_frame *xdpf, int *nxmit_byte, bool dma_map) { - struct mvneta_tx_desc *tx_desc; - struct mvneta_tx_buf *buf; - dma_addr_t dma_addr; + struct xdp_shared_info *xdp_sinfo = xdp_get_shared_info_from_frame(xdpf); + int i, num_frames = xdpf->mb ? xdp_sinfo->nr_frags + 1 : 1; + struct mvneta_tx_desc *tx_desc = NULL; + struct page *page; - if (txq->count >= txq->tx_stop_threshold) + if (txq->count + num_frames >= txq->size) return MVNETA_XDP_DROPPED; - tx_desc = mvneta_txq_next_desc_get(txq); + for (i = 0; i < num_frames; i++) { + struct mvneta_tx_buf *buf = &txq->buf[txq->txq_put_index]; + skb_frag_t *frag = i ? &xdp_sinfo->frags[i - 1] : NULL; + int len = frag ? xdp_get_frag_size(frag) : xdpf->len; + dma_addr_t dma_addr; - buf = &txq->buf[txq->txq_put_index]; - if (dma_map) { - /* ndo_xdp_xmit */ - dma_addr = dma_map_single(pp->dev->dev.parent, xdpf->data, - xdpf->len, DMA_TO_DEVICE); - if (dma_mapping_error(pp->dev->dev.parent, dma_addr)) { - mvneta_txq_desc_put(txq); - return MVNETA_XDP_DROPPED; + tx_desc = mvneta_txq_next_desc_get(txq); + if (dma_map) { + /* ndo_xdp_xmit */ + void *data; + + data = frag ? xdp_get_frag_address(frag) : xdpf->data; + dma_addr = dma_map_single(pp->dev->dev.parent, data, + len, DMA_TO_DEVICE); + if (dma_mapping_error(pp->dev->dev.parent, dma_addr)) { + for (; i >= 0; i--) + mvneta_txq_desc_put(txq); + return MVNETA_XDP_DROPPED; + } + buf->type = MVNETA_TYPE_XDP_NDO; + } else { + page = frag ? xdp_get_frag_page(frag) + : virt_to_page(xdpf->data); + dma_addr = page_pool_get_dma_addr(page); + if (frag) + dma_addr += xdp_get_frag_offset(frag); + else + dma_addr += sizeof(*xdpf) + xdpf->headroom; + dma_sync_single_for_device(pp->dev->dev.parent, + dma_addr, len, + DMA_BIDIRECTIONAL); + buf->type = MVNETA_TYPE_XDP_TX; } - buf->type = MVNETA_TYPE_XDP_NDO; - } else { - struct page *page = virt_to_page(xdpf->data); + buf->xdpf = i ? NULL : xdpf; + + tx_desc->command = !i ? MVNETA_TXD_F_DESC : 0; + tx_desc->buf_phys_addr = dma_addr; + tx_desc->data_size = len; + *nxmit_byte += len; - dma_addr = page_pool_get_dma_addr(page) + - sizeof(*xdpf) + xdpf->headroom; - dma_sync_single_for_device(pp->dev->dev.parent, dma_addr, - xdpf->len, DMA_BIDIRECTIONAL); - buf->type = MVNETA_TYPE_XDP_TX; + mvneta_txq_inc_put(txq); } - buf->xdpf = xdpf; - tx_desc->command = MVNETA_TXD_FLZ_DESC; - tx_desc->buf_phys_addr = dma_addr; - tx_desc->data_size = xdpf->len; + /*last descriptor */ + tx_desc->command |= MVNETA_TXD_L_DESC | MVNETA_TXD_Z_PAD; - mvneta_txq_inc_put(txq); - txq->pending++; - txq->count++; + txq->pending += num_frames; + txq->count += num_frames; return MVNETA_XDP_TX; } @@ -2103,8 +2122,8 @@ mvneta_xdp_xmit_back(struct mvneta_port *pp, struct xdp_buff *xdp) struct mvneta_pcpu_stats *stats = this_cpu_ptr(pp->stats); struct mvneta_tx_queue *txq; struct netdev_queue *nq; + int cpu, nxmit_byte = 0; struct xdp_frame *xdpf; - int cpu; u32 ret; xdpf = xdp_convert_buff_to_frame(xdp); @@ -2116,10 +2135,10 @@ mvneta_xdp_xmit_back(struct mvneta_port *pp, struct xdp_buff *xdp) nq = netdev_get_tx_queue(pp->dev, txq->id); __netif_tx_lock(nq, cpu); - ret = mvneta_xdp_submit_frame(pp, txq, xdpf, false); + ret = mvneta_xdp_submit_frame(pp, txq, xdpf, &nxmit_byte, false); if (ret == MVNETA_XDP_TX) { u64_stats_update_begin(&stats->syncp); - stats->es.ps.tx_bytes += xdpf->len; + stats->es.ps.tx_bytes += nxmit_byte; stats->es.ps.tx_packets++; stats->es.ps.xdp_tx++; u64_stats_update_end(&stats->syncp); @@ -2158,10 +2177,9 @@ mvneta_xdp_xmit(struct net_device *dev, int num_frame, __netif_tx_lock(nq, cpu); for (i = 0; i < num_frame; i++) { - ret = mvneta_xdp_submit_frame(pp, txq, frames[i], true); - if (ret == MVNETA_XDP_TX) { - nxmit_byte += frames[i]->len; - } else { + ret = mvneta_xdp_submit_frame(pp, txq, frames[i], &nxmit_byte, + true); + if (ret != MVNETA_XDP_TX) { xdp_return_frame_rx_napi(frames[i]); nxmit--; }