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[144.49.247.20]) by smtp-relay.gmail.com with ESMTPS id d2e1a72fcca58-82b03547a3fsm37092b3a.0.2026.03.19.14.23.07 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 19 Mar 2026 14:23:07 -0700 (PDT) X-Relaying-Domain: broadcom.com X-CFilter-Loop: Reflected Received: by mail-dy1-f199.google.com with SMTP id 5a478bee46e88-2bdc1b30ac8so26727428eec.1 for ; Thu, 19 Mar 2026 14:23:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1773955385; x=1774560185; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=9XCD7P77uKOJaU71jQh2aYICC6t2lNxcd5cbzp78RBM=; b=cV5HyhMpbeNi0pftRvm/737kp5kHS5QB2fsD5b9BaI3k4ooWRdAHBX+W9HJ+j8Nl4w vxN+r9BT8Z06nrIdrkRa8P4GgGRp8LHT1dijJZk5ODrPAsVKMpACX4lWjLWGk/eVpdGg OgzLOvGJmftvUt6IcQzRPYeG2pfmqFKsoEfG0= X-Forwarded-Encrypted: i=1; AJvYcCXvXrTNAtBl2FwvyCwGfJRl/48Rrx/jO3oPV2ZDuLjMvQQu55F/w8cpd+Kxh8JOXNjjrfNXrjuIO0Qdrqo=@vger.kernel.org X-Received: by 2002:a05:7300:6423:b0:2c0:d9e6:7eb0 with SMTP id 5a478bee46e88-2c109712f8dmr558416eec.16.1773955385433; Thu, 19 Mar 2026 14:23:05 -0700 (PDT) X-Received: by 2002:a05:7300:6423:b0:2c0:d9e6:7eb0 with SMTP id 5a478bee46e88-2c109712f8dmr558392eec.16.1773955384705; Thu, 19 Mar 2026 14:23:04 -0700 (PDT) Received: from [10.14.5.69] ([192.19.161.248]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2c10b17b90dsm657777eec.10.2026.03.19.14.23.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 19 Mar 2026 14:23:04 -0700 (PDT) Message-ID: Date: Thu, 19 Mar 2026 14:23:02 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next v3 3/6] net: bcmgenet: add basic XDP support (PASS/DROP) To: Nicolai Buchwitz , netdev@vger.kernel.org Cc: Doug Berger , Florian Fainelli , Broadcom internal kernel review list , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Stanislav Fomichev , linux-kernel@vger.kernel.org, bpf@vger.kernel.org References: <20260319115402.353509-1-nb@tipi-net.de> <20260319115402.353509-4-nb@tipi-net.de> Content-Language: en-US From: Justin Chen In-Reply-To: <20260319115402.353509-4-nb@tipi-net.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e On 3/19/26 4:53 AM, Nicolai Buchwitz wrote: > Add XDP program attachment via ndo_bpf and execute XDP programs in the > RX path. XDP_PASS builds an SKB from the xdp_buff (handling > xdp_adjust_head/tail), XDP_DROP returns the page to page_pool without > SKB allocation. > > XDP_TX and XDP_REDIRECT are not yet supported and return XDP_ABORTED. > > Advertise NETDEV_XDP_ACT_BASIC in xdp_features. > > Signed-off-by: Nicolai Buchwitz > --- > .../net/ethernet/broadcom/genet/bcmgenet.c | 147 +++++++++++++++--- > .../net/ethernet/broadcom/genet/bcmgenet.h | 4 + > 2 files changed, 133 insertions(+), 18 deletions(-) > > diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c > index 6e610e73e12f..e8f90d6b16a2 100644 > --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c > +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c > @@ -35,6 +35,8 @@ > #include > #include > #include > +#include > +#include > > #include > > @@ -2274,6 +2276,53 @@ static int bcmgenet_rx_refill(struct bcmgenet_rx_ring *ring, > return 0; > } > > +static struct sk_buff *bcmgenet_xdp_build_skb(struct bcmgenet_rx_ring *ring, > + struct xdp_buff *xdp, > + struct page *rx_page) > +{ > + unsigned int metasize; > + struct sk_buff *skb; > + > + skb = napi_build_skb(xdp->data_hard_start, PAGE_SIZE); > + if (unlikely(!skb)) > + return NULL; > + > + skb_mark_for_recycle(skb); > + > + metasize = xdp->data - xdp->data_meta; > + skb_reserve(skb, xdp->data - xdp->data_hard_start); > + __skb_put(skb, xdp->data_end - xdp->data); > + > + if (metasize) > + skb_metadata_set(skb, metasize); > + > + return skb; > +} > + > +static unsigned int Perfer to not have a newline here. To match the formatting of the rest of the driver. Thanks, Justin > +bcmgenet_run_xdp(struct bcmgenet_rx_ring *ring, struct bpf_prog *prog, > + struct xdp_buff *xdp, struct page *rx_page) > +{ > + unsigned int act; > + > + act = bpf_prog_run_xdp(prog, xdp); > + > + switch (act) { > + case XDP_PASS: > + return XDP_PASS; > + case XDP_DROP: > + page_pool_put_full_page(ring->page_pool, rx_page, true); > + return XDP_DROP; > + default: > + bpf_warn_invalid_xdp_action(ring->priv->dev, prog, act); > + fallthrough; > + case XDP_ABORTED: > + trace_xdp_exception(ring->priv->dev, prog, act); > + page_pool_put_full_page(ring->page_pool, rx_page, true); > + return XDP_ABORTED; > + } > +} > + > /* bcmgenet_desc_rx - descriptor based rx process. > * this could be called from bottom half, or from NAPI polling method. > */ > @@ -2283,6 +2332,7 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring, > struct bcmgenet_rx_stats64 *stats = &ring->stats64; > struct bcmgenet_priv *priv = ring->priv; > struct net_device *dev = priv->dev; > + struct bpf_prog *xdp_prog; > struct enet_cb *cb; > struct sk_buff *skb; > u32 dma_length_status; > @@ -2293,6 +2343,8 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring, > unsigned int p_index, mask; > unsigned int discards; > > + xdp_prog = READ_ONCE(priv->xdp_prog); > + > /* Clear status before servicing to reduce spurious interrupts */ > mask = 1 << (UMAC_IRQ1_RX_INTR_SHIFT + ring->index); > bcmgenet_intrl2_1_writel(priv, mask, INTRL2_CPU_CLEAR); > @@ -2403,26 +2455,52 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring, > goto next; > } /* error packet */ > > - /* Build SKB from the page - data starts at hard_start, > - * frame begins after RSB(64) + pad(2) = 66 bytes. > - */ > - skb = napi_build_skb(hard_start, PAGE_SIZE - GENET_XDP_HEADROOM); > - if (unlikely(!skb)) { > - BCMGENET_STATS64_INC(stats, dropped); > - page_pool_put_full_page(ring->page_pool, rx_page, > - true); > - goto next; > - } > - > - skb_mark_for_recycle(skb); > + /* XDP: frame data starts after RSB + pad */ > + if (xdp_prog) { > + struct xdp_buff xdp; > + unsigned int xdp_act; > + int pkt_len; > + > + pkt_len = len - GENET_RSB_PAD; > + if (priv->crc_fwd_en) > + pkt_len -= ETH_FCS_LEN; > + > + xdp_init_buff(&xdp, PAGE_SIZE, &ring->xdp_rxq); > + xdp_prepare_buff(&xdp, page_address(rx_page), > + GENET_RX_HEADROOM, pkt_len, true); > + > + xdp_act = bcmgenet_run_xdp(ring, xdp_prog, &xdp, > + rx_page); > + if (xdp_act != XDP_PASS) > + goto next; > + > + /* XDP_PASS: build SKB from (possibly modified) xdp */ > + skb = bcmgenet_xdp_build_skb(ring, &xdp, rx_page); > + if (unlikely(!skb)) { > + BCMGENET_STATS64_INC(stats, dropped); > + page_pool_put_full_page(ring->page_pool, > + rx_page, true); > + goto next; > + } > + } else { > + /* Build SKB from the page - data starts at > + * hard_start, frame begins after RSB(64) + pad(2). > + */ > + skb = napi_build_skb(hard_start, > + PAGE_SIZE - GENET_XDP_HEADROOM); > + if (unlikely(!skb)) { > + BCMGENET_STATS64_INC(stats, dropped); > + page_pool_put_full_page(ring->page_pool, > + rx_page, true); > + goto next; > + } > > - /* Reserve the RSB + pad, then set the data length */ > - skb_reserve(skb, GENET_RSB_PAD); > - __skb_put(skb, len - GENET_RSB_PAD); > + skb_mark_for_recycle(skb); > + skb_reserve(skb, GENET_RSB_PAD); > + __skb_put(skb, len - GENET_RSB_PAD); > > - if (priv->crc_fwd_en) { > - skb_trim(skb, skb->len - ETH_FCS_LEN); > - len -= ETH_FCS_LEN; > + if (priv->crc_fwd_en) > + skb_trim(skb, skb->len - ETH_FCS_LEN); > } > > /* Set up checksum offload */ > @@ -3743,6 +3821,37 @@ static int bcmgenet_change_carrier(struct net_device *dev, bool new_carrier) > return 0; > } > > +static int bcmgenet_xdp_setup(struct net_device *dev, > + struct netdev_bpf *xdp) > +{ > + struct bcmgenet_priv *priv = netdev_priv(dev); > + struct bpf_prog *old_prog; > + struct bpf_prog *prog = xdp->prog; > + > + if (prog && dev->mtu > PAGE_SIZE - GENET_RX_HEADROOM - > + SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) { > + NL_SET_ERR_MSG_MOD(xdp->extack, > + "MTU too large for single-page XDP buffer"); > + return -EOPNOTSUPP; > + } > + > + old_prog = xchg(&priv->xdp_prog, prog); > + if (old_prog) > + bpf_prog_put(old_prog); > + > + return 0; > +} > + > +static int bcmgenet_xdp(struct net_device *dev, struct netdev_bpf *xdp) > +{ > + switch (xdp->command) { > + case XDP_SETUP_PROG: > + return bcmgenet_xdp_setup(dev, xdp); > + default: > + return -EOPNOTSUPP; > + } > +} > + > static const struct net_device_ops bcmgenet_netdev_ops = { > .ndo_open = bcmgenet_open, > .ndo_stop = bcmgenet_close, > @@ -3754,6 +3863,7 @@ static const struct net_device_ops bcmgenet_netdev_ops = { > .ndo_set_features = bcmgenet_set_features, > .ndo_get_stats64 = bcmgenet_get_stats64, > .ndo_change_carrier = bcmgenet_change_carrier, > + .ndo_bpf = bcmgenet_xdp, > }; > > /* GENET hardware parameters/characteristics */ > @@ -4056,6 +4166,7 @@ static int bcmgenet_probe(struct platform_device *pdev) > NETIF_F_RXCSUM; > dev->hw_features |= dev->features; > dev->vlan_features |= dev->features; > + dev->xdp_features = NETDEV_XDP_ACT_BASIC; > > netdev_sw_irq_coalesce_default_on(dev); > > diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.h b/drivers/net/ethernet/broadcom/genet/bcmgenet.h > index 82a6d29f481d..1459473ac1b0 100644 > --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.h > +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.h > @@ -16,6 +16,7 @@ > #include > #include > #include > +#include > #include > > #include "../unimac.h" > @@ -671,6 +672,9 @@ struct bcmgenet_priv { > u8 sopass[SOPASS_MAX]; > > struct bcmgenet_mib_counters mib; > + > + /* XDP */ > + struct bpf_prog *xdp_prog; > }; > > static inline bool bcmgenet_has_40bits(struct bcmgenet_priv *priv)