From patchwork Mon Nov 27 11:53:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yoshihiro Shimoda X-Patchwork-Id: 13469439 X-Patchwork-Delegate: geert@linux-m68k.org Authentication-Results: smtp.subspace.kernel.org; dkim=none Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 1035918F; Mon, 27 Nov 2023 03:53:43 -0800 (PST) X-IronPort-AV: E=Sophos;i="6.04,230,1695654000"; d="scan'208";a="188253126" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 27 Nov 2023 20:53:40 +0900 Received: from localhost.localdomain (unknown [10.166.13.99]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 6F9AF400C75F; Mon, 27 Nov 2023 20:53:40 +0900 (JST) From: Yoshihiro Shimoda To: s.shtylyov@omp.ru, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Yoshihiro Shimoda Subject: [PATCH net-next 7/9] net: rswitch: Add jumbo frames handling for RX Date: Mon, 27 Nov 2023 20:53:32 +0900 Message-Id: <20231127115334.3670790-8-yoshihiro.shimoda.uh@renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231127115334.3670790-1-yoshihiro.shimoda.uh@renesas.com> References: <20231127115334.3670790-1-yoshihiro.shimoda.uh@renesas.com> Precedence: bulk X-Mailing-List: linux-renesas-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 If this hardware receives a jumbo frame like 2KiB or more, it will be split into multiple queues. In near the future, to support this, add handling specific descriptor types F{START,MID,END}. However, such jumbo frames will not happen yet because the maximum MTU size is still default for now. Signed-off-by: Yoshihiro Shimoda --- drivers/net/ethernet/renesas/rswitch.c | 86 +++++++++++++++++++++++--- drivers/net/ethernet/renesas/rswitch.h | 2 + 2 files changed, 78 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c index d24ba2411d5e..009e6bfdad27 100644 --- a/drivers/net/ethernet/renesas/rswitch.c +++ b/drivers/net/ethernet/renesas/rswitch.c @@ -713,6 +713,80 @@ static int rswitch_gwca_halt(struct rswitch_private *priv) return err; } +static struct sk_buff *rswitch_rx_handle_desc(struct net_device *ndev, + struct rswitch_gwca_queue *gq, + struct rswitch_ext_ts_desc *desc) +{ + dma_addr_t dma_addr = rswitch_desc_get_dptr(&desc->desc); + u16 pkt_len = le16_to_cpu(desc->desc.info_ds) & RX_DS; + u8 die_dt = desc->desc.die_dt & DT_MASK; + struct sk_buff *skb = NULL; + + dma_unmap_single(ndev->dev.parent, dma_addr, RSWITCH_MAP_BUF_SIZE, + DMA_FROM_DEVICE); + + /* The RX descriptor order will be one of the following: + * - FSINGLE + * - FSTART -> FEND + * - FSTART -> FMID -> FEND + */ + + /* Check whether the descriptor is unexpected order */ + switch (die_dt) { + case DT_FSTART: + case DT_FSINGLE: + if (gq->skb_fstart) { + dev_kfree_skb_any(gq->skb_fstart); + gq->skb_fstart = NULL; + ndev->stats.rx_dropped++; + } + break; + case DT_FMID: + case DT_FEND: + if (!gq->skb_fstart) { + ndev->stats.rx_dropped++; + return NULL; + } + break; + default: + break; + } + + /* Handle the descriptor */ + switch (die_dt) { + case DT_FSTART: + case DT_FSINGLE: + skb = build_skb(gq->rx_bufs[gq->cur], RSWITCH_BUF_SIZE); + if (skb) { + skb_reserve(skb, RSWITCH_HEADROOM); + skb_put(skb, pkt_len); + gq->pkt_len = pkt_len; + if (die_dt == DT_FSTART) { + gq->skb_fstart = skb; + skb = NULL; + } + } + break; + case DT_FMID: + case DT_FEND: + skb_add_rx_frag(gq->skb_fstart, skb_shinfo(gq->skb_fstart)->nr_frags, + virt_to_page(gq->rx_bufs[gq->cur]), + offset_in_page(gq->rx_bufs[gq->cur]) + RSWITCH_HEADROOM, + pkt_len, RSWITCH_BUF_SIZE); + if (die_dt == DT_FEND) { + skb = gq->skb_fstart; + gq->skb_fstart = NULL; + } + gq->pkt_len += pkt_len; + break; + default: + netdev_err(ndev, "%s: unexpected value (%x)\n", __func__, die_dt); + break; + } + + return skb; +} + static bool rswitch_rx(struct net_device *ndev, int *quota) { struct rswitch_device *rdev = netdev_priv(ndev); @@ -720,9 +794,7 @@ static bool rswitch_rx(struct net_device *ndev, int *quota) struct rswitch_ext_ts_desc *desc; int limit, boguscnt, ret; struct sk_buff *skb; - dma_addr_t dma_addr; unsigned int num; - u16 pkt_len; u32 get_ts; if (*quota <= 0) @@ -734,15 +806,9 @@ static bool rswitch_rx(struct net_device *ndev, int *quota) desc = &gq->rx_ring[gq->cur]; while ((desc->desc.die_dt & DT_MASK) != DT_FEMPTY) { dma_rmb(); - pkt_len = le16_to_cpu(desc->desc.info_ds) & RX_DS; - dma_addr = rswitch_desc_get_dptr(&desc->desc); - dma_unmap_single(ndev->dev.parent, dma_addr, - RSWITCH_MAP_BUF_SIZE, DMA_FROM_DEVICE); - skb = build_skb(gq->rx_bufs[gq->cur], RSWITCH_BUF_SIZE); + skb = rswitch_rx_handle_desc(ndev, gq, desc); if (!skb) goto out; - skb_reserve(skb, RSWITCH_HEADROOM); - skb_put(skb, pkt_len); get_ts = rdev->priv->ptp_priv->tstamp_rx_ctrl & RCAR_GEN4_RXTSTAMP_TYPE_V2_L2_EVENT; if (get_ts) { @@ -758,7 +824,7 @@ static bool rswitch_rx(struct net_device *ndev, int *quota) skb->protocol = eth_type_trans(skb, ndev); napi_gro_receive(&rdev->napi, skb); rdev->ndev->stats.rx_packets++; - rdev->ndev->stats.rx_bytes += pkt_len; + rdev->ndev->stats.rx_bytes += gq->pkt_len; out: gq->rx_bufs[gq->cur] = NULL; diff --git a/drivers/net/ethernet/renesas/rswitch.h b/drivers/net/ethernet/renesas/rswitch.h index 17e617ec4187..4252677e2a55 100644 --- a/drivers/net/ethernet/renesas/rswitch.h +++ b/drivers/net/ethernet/renesas/rswitch.h @@ -965,6 +965,8 @@ struct rswitch_gwca_queue { /* For RX */ struct { void **rx_bufs; + struct sk_buff *skb_fstart; + u16 pkt_len; }; }; };