From patchwork Fri Oct 11 09:01:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kurt Kanzenbach X-Patchwork-Id: 13832246 X-Patchwork-Delegate: kuba@kernel.org Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 55ED520CCF6; Fri, 11 Oct 2024 09:01:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728637277; cv=none; b=rlYrno2Zkppx0RKxR/luhEdW5Y335I6GphXLAa06B7+Ya8abZIuRdh1VwF/fRyUH0qm9oy+tIN3Dt+liMTfExhgukOFibL7Texhwbq0gPpm0iRWZ1t0UAL62kA5LDTRRHWRZLW9BLXNqmvW0XrdqENC5HHSryXm1DcKuy8A9J68= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728637277; c=relaxed/simple; bh=eKpBdOAnMpLAqJL2yLHTX021SeC5dJoHzcJGXK2HIp4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=q0WkOzilYTtyCNTzqZzi7j/sGHD8BiMKKYUITkN4dxIvgZ1Jt4HODW2+KonFt7FibT9wFhfzQoifb/1BAnWd6EhjTPNYP7fSHLfsIxBk0ITTfB4Wpd3ZblhwLsS91f+CSoX6+5HCkO0DD4kjZmCx+Q190LCu8NBZU63nLQFpfag= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=xprnHCHg; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=INZt7Rib; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="xprnHCHg"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="INZt7Rib" From: Kurt Kanzenbach DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1728637273; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=cLGmaZbP7Tnvuf+2kRrK60O3oJVG11tEahwWtCc+arc=; b=xprnHCHghTzvaXFXzyVjCsk92Dl+o2q0rQZG5UmUxR1O9Mae6v9IvK2W4Xoov4P3dF6X6s ArVmJr5ey2cwrpIDCcU000/Vmo9paqK5ubkH+G8jd4zElKy43mTlIQVZafuXf2c3psC+VZ HOFV/YqOt7+rUIPLcJPHJcHIc/WkPJCW7nS4//WfWB8tp1TLiN3YDM+9fLPaRSrTLcf4/a QFEpvFG7T0bunW0sJj3v7MBsNwjsKBL4P9Cz+DmIlboLxjDrLp2L+VuQsdDlfqaHNTfFsh DKb25aOoFJtw9QxRtXQNCBZwka8Sw4lBeMtdgsIrP2VMvMCPuhqQJCKgmtUK6A== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1728637273; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=cLGmaZbP7Tnvuf+2kRrK60O3oJVG11tEahwWtCc+arc=; b=INZt7Rib8FaZ+RNgIcgpqfqBOEwWAR0gvqXrra1D4THWn00K57jXIwT6c6rt9Dpzw6A26g 6xHfp5VWvz6xOhCw== Date: Fri, 11 Oct 2024 11:01:04 +0200 Subject: [PATCH iwl-next v8 6/6] igb: Add AF_XDP zero-copy Tx support Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241011-b4-igb_zero_copy-v8-6-83862f726a9e@linutronix.de> References: <20241011-b4-igb_zero_copy-v8-0-83862f726a9e@linutronix.de> In-Reply-To: <20241011-b4-igb_zero_copy-v8-0-83862f726a9e@linutronix.de> To: Tony Nguyen , Przemek Kitszel Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Richard Cochran , Sriram Yagnaraman , Benjamin Steinke , Sebastian Andrzej Siewior , Maciej Fijalkowski , intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, bpf@vger.kernel.org, Sriram Yagnaraman , Kurt Kanzenbach X-Developer-Signature: v=1; a=openpgp-sha256; l=9804; i=kurt@linutronix.de; h=from:subject:message-id; bh=jKn5J793xMPKxDnLUmzMCNl+Q9L4ax453XVgxJePrQE=; b=owEBbQKS/ZANAwAKAcGT0fKqRnOCAcsmYgBnCOlT9LiWaj3z2j8G3uc+76S28Netr2Ytx5DKx 2TByC9MmK2JAjMEAAEKAB0WIQS8ub+yyMN909/bWZLBk9HyqkZzggUCZwjpUwAKCRDBk9HyqkZz gmQAD/9gn9U7bDhEE3kxs4atgjXi4xEvO4H06TrWOh0hbDXZ7kFTlsKh4cahZVWzfz5/VHiaCCQ UiR3uFfTzGQCcemkEyjjGvkfpaVBjXeUrkKxD7h5LfPhvTki+WBcSC5+GVvfKDrZFD63QWnWOCN lvDXyLudi01c6ljF5PTv+7KuIPPIYrO1PFfuCjLfriWbSRxiwkyEh/lhoWZvopxXCJ+3p6f5SGT nAwbFY/Ub1VJx4UEblj8OpBDDrz/76dCSjV9jNkLDGXWX/DeA2z21goNmq9Aw/X6HJXhBTqCx8K pi/fZhjDgsBt6cM0x1GsOBxOHXC7J8hwHmfPXEfPtpjdJ+vr/ZPTy5paiyYlkjgEGi6JXLP/jxZ t6/MsS8c3dR2vyvT/405yO8pQ7j2q3heoJW/3SE73WH4IG4MkWHgZ39wiziFUf/JmqosJc7cDKS w5kACEQ4X186T1HsgpcgoEHp1dcBx5wzK+gOhMsmCqKWXnpqvmVWhbHvRjK1ZN7PHkJZKiW7iZ3 A2acTmWcUrHZ2Hj7lg4VfrUyulfYlcxrQhmYD2Wux84//9EwJSnzD+AuuO+ZFTCib4gDLgsODaN nrubVaXxET0HL0aObZSE/o71NIjtAWuVyqMsr3S/b3fJweQFAvoF23b2xAVUonRsdIukabe8ZWw AMLF9Y91Nxsc9Tg== X-Developer-Key: i=kurt@linutronix.de; a=openpgp; fpr=BCB9BFB2C8C37DD3DFDB5992C193D1F2AA467382 X-Patchwork-Delegate: kuba@kernel.org From: Sriram Yagnaraman Add support for AF_XDP zero-copy transmit path. A new TX buffer type IGB_TYPE_XSK is introduced to indicate that the Tx frame was allocated from the xsk buff pool, so igb_clean_tx_ring() and igb_clean_tx_irq() can clean the buffers correctly based on type. igb_xmit_zc() performs the actual packet transmit when AF_XDP zero-copy is enabled. We share the TX ring between slow path, XDP and AF_XDP zero-copy, so we use the netdev queue lock to ensure mutual exclusion. Signed-off-by: Sriram Yagnaraman [Kurt: Set olinfo_status in igb_xmit_zc() so that frames are transmitted, Use READ_ONCE() for xsk_pool and check Tx disabled and carrier in igb_xmit_zc(), Add FIXME for RS bit] Signed-off-by: Kurt Kanzenbach Reviewed-by: Maciej Fijalkowski --- drivers/net/ethernet/intel/igb/igb.h | 2 + drivers/net/ethernet/intel/igb/igb_main.c | 61 ++++++++++++++++++++++++----- drivers/net/ethernet/intel/igb/igb_xsk.c | 64 +++++++++++++++++++++++++++++++ 3 files changed, 117 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h index e4a85867aa18..f6ac74327bb3 100644 --- a/drivers/net/ethernet/intel/igb/igb.h +++ b/drivers/net/ethernet/intel/igb/igb.h @@ -258,6 +258,7 @@ enum igb_tx_flags { enum igb_tx_buf_type { IGB_TYPE_SKB = 0, IGB_TYPE_XDP, + IGB_TYPE_XSK }; /* wrapper around a pointer to a socket buffer, @@ -859,6 +860,7 @@ bool igb_alloc_rx_buffers_zc(struct igb_ring *rx_ring, void igb_clean_rx_ring_zc(struct igb_ring *rx_ring); int igb_clean_rx_irq_zc(struct igb_q_vector *q_vector, struct xsk_buff_pool *xsk_pool, const int budget); +bool igb_xmit_zc(struct igb_ring *tx_ring); int igb_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags); #endif /* _IGB_H_ */ diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 711b60cab594..5f396c02e3b9 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -2979,6 +2979,9 @@ static int igb_xdp_xmit(struct net_device *dev, int n, if (unlikely(!tx_ring)) return -ENXIO; + if (unlikely(test_bit(IGB_RING_FLAG_TX_DISABLED, &tx_ring->flags))) + return -ENXIO; + nq = txring_txq(tx_ring); __netif_tx_lock(nq, cpu); @@ -3326,7 +3329,8 @@ static int igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent) netdev->priv_flags |= IFF_SUPP_NOFCS; netdev->priv_flags |= IFF_UNICAST_FLT; - netdev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT; + netdev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT | + NETDEV_XDP_ACT_XSK_ZEROCOPY; /* MTU range: 68 - 9216 */ netdev->min_mtu = ETH_MIN_MTU; @@ -4900,15 +4904,20 @@ void igb_clean_tx_ring(struct igb_ring *tx_ring) { u16 i = tx_ring->next_to_clean; struct igb_tx_buffer *tx_buffer = &tx_ring->tx_buffer_info[i]; + u32 xsk_frames = 0; while (i != tx_ring->next_to_use) { union e1000_adv_tx_desc *eop_desc, *tx_desc; /* Free all the Tx ring sk_buffs or xdp frames */ - if (tx_buffer->type == IGB_TYPE_SKB) + if (tx_buffer->type == IGB_TYPE_SKB) { dev_kfree_skb_any(tx_buffer->skb); - else + } else if (tx_buffer->type == IGB_TYPE_XDP) { xdp_return_frame(tx_buffer->xdpf); + } else if (tx_buffer->type == IGB_TYPE_XSK) { + xsk_frames++; + goto skip_for_xsk; + } /* unmap skb header data */ dma_unmap_single(tx_ring->dev, @@ -4939,6 +4948,7 @@ void igb_clean_tx_ring(struct igb_ring *tx_ring) DMA_TO_DEVICE); } +skip_for_xsk: tx_buffer->next_to_watch = NULL; /* move us one more past the eop_desc for start of next pkt */ @@ -4953,6 +4963,9 @@ void igb_clean_tx_ring(struct igb_ring *tx_ring) /* reset BQL for queue */ netdev_tx_reset_queue(txring_txq(tx_ring)); + if (tx_ring->xsk_pool && xsk_frames) + xsk_tx_completed(tx_ring->xsk_pool, xsk_frames); + /* reset next_to_use and next_to_clean */ tx_ring->next_to_use = 0; tx_ring->next_to_clean = 0; @@ -6486,6 +6499,9 @@ netdev_tx_t igb_xmit_frame_ring(struct sk_buff *skb, return NETDEV_TX_BUSY; } + if (unlikely(test_bit(IGB_RING_FLAG_TX_DISABLED, &tx_ring->flags))) + return NETDEV_TX_BUSY; + /* record the location of the first descriptor for this packet */ first = &tx_ring->tx_buffer_info[tx_ring->next_to_use]; first->type = IGB_TYPE_SKB; @@ -8260,13 +8276,18 @@ static int igb_poll(struct napi_struct *napi, int budget) **/ static bool igb_clean_tx_irq(struct igb_q_vector *q_vector, int napi_budget) { - struct igb_adapter *adapter = q_vector->adapter; - struct igb_ring *tx_ring = q_vector->tx.ring; - struct igb_tx_buffer *tx_buffer; - union e1000_adv_tx_desc *tx_desc; unsigned int total_bytes = 0, total_packets = 0; + struct igb_adapter *adapter = q_vector->adapter; unsigned int budget = q_vector->tx.work_limit; + struct igb_ring *tx_ring = q_vector->tx.ring; unsigned int i = tx_ring->next_to_clean; + union e1000_adv_tx_desc *tx_desc; + struct igb_tx_buffer *tx_buffer; + struct xsk_buff_pool *xsk_pool; + int cpu = smp_processor_id(); + bool xsk_xmit_done = true; + struct netdev_queue *nq; + u32 xsk_frames = 0; if (test_bit(__IGB_DOWN, &adapter->state)) return true; @@ -8297,10 +8318,14 @@ static bool igb_clean_tx_irq(struct igb_q_vector *q_vector, int napi_budget) total_packets += tx_buffer->gso_segs; /* free the skb */ - if (tx_buffer->type == IGB_TYPE_SKB) + if (tx_buffer->type == IGB_TYPE_SKB) { napi_consume_skb(tx_buffer->skb, napi_budget); - else + } else if (tx_buffer->type == IGB_TYPE_XDP) { xdp_return_frame(tx_buffer->xdpf); + } else if (tx_buffer->type == IGB_TYPE_XSK) { + xsk_frames++; + goto skip_for_xsk; + } /* unmap skb header data */ dma_unmap_single(tx_ring->dev, @@ -8332,6 +8357,7 @@ static bool igb_clean_tx_irq(struct igb_q_vector *q_vector, int napi_budget) } } +skip_for_xsk: /* move us one more past the eop_desc for start of next pkt */ tx_buffer++; tx_desc++; @@ -8360,6 +8386,21 @@ static bool igb_clean_tx_irq(struct igb_q_vector *q_vector, int napi_budget) q_vector->tx.total_bytes += total_bytes; q_vector->tx.total_packets += total_packets; + xsk_pool = READ_ONCE(tx_ring->xsk_pool); + if (xsk_pool) { + if (xsk_frames) + xsk_tx_completed(xsk_pool, xsk_frames); + if (xsk_uses_need_wakeup(xsk_pool)) + xsk_set_tx_need_wakeup(xsk_pool); + + nq = txring_txq(tx_ring); + __netif_tx_lock(nq, cpu); + /* Avoid transmit queue timeout since we share it with the slow path */ + txq_trans_cond_update(nq); + xsk_xmit_done = igb_xmit_zc(tx_ring); + __netif_tx_unlock(nq); + } + if (test_bit(IGB_RING_FLAG_TX_DETECT_HANG, &tx_ring->flags)) { struct e1000_hw *hw = &adapter->hw; @@ -8422,7 +8463,7 @@ static bool igb_clean_tx_irq(struct igb_q_vector *q_vector, int napi_budget) } } - return !!budget; + return !!budget && xsk_xmit_done; } /** diff --git a/drivers/net/ethernet/intel/igb/igb_xsk.c b/drivers/net/ethernet/intel/igb/igb_xsk.c index 22d234db0fab..d962c5e22b71 100644 --- a/drivers/net/ethernet/intel/igb/igb_xsk.c +++ b/drivers/net/ethernet/intel/igb/igb_xsk.c @@ -465,6 +465,70 @@ int igb_clean_rx_irq_zc(struct igb_q_vector *q_vector, return failure ? budget : (int)total_packets; } +bool igb_xmit_zc(struct igb_ring *tx_ring) +{ + unsigned int budget = igb_desc_unused(tx_ring); + struct xsk_buff_pool *pool = tx_ring->xsk_pool; + u32 cmd_type, olinfo_status, nb_pkts, i = 0; + struct xdp_desc *descs = pool->tx_descs; + union e1000_adv_tx_desc *tx_desc = NULL; + struct igb_tx_buffer *tx_buffer_info; + unsigned int total_bytes = 0; + dma_addr_t dma; + + if (!netif_carrier_ok(tx_ring->netdev)) + return true; + + if (test_bit(IGB_RING_FLAG_TX_DISABLED, &tx_ring->flags)) + return true; + + nb_pkts = xsk_tx_peek_release_desc_batch(pool, budget); + if (!nb_pkts) + return true; + + while (nb_pkts-- > 0) { + dma = xsk_buff_raw_get_dma(pool, descs[i].addr); + xsk_buff_raw_dma_sync_for_device(pool, dma, descs[i].len); + + tx_buffer_info = &tx_ring->tx_buffer_info[tx_ring->next_to_use]; + tx_buffer_info->bytecount = descs[i].len; + tx_buffer_info->type = IGB_TYPE_XSK; + tx_buffer_info->xdpf = NULL; + tx_buffer_info->gso_segs = 1; + tx_buffer_info->time_stamp = jiffies; + + tx_desc = IGB_TX_DESC(tx_ring, tx_ring->next_to_use); + tx_desc->read.buffer_addr = cpu_to_le64(dma); + + /* put descriptor type bits */ + cmd_type = E1000_ADVTXD_DTYP_DATA | E1000_ADVTXD_DCMD_DEXT | + E1000_ADVTXD_DCMD_IFCS; + olinfo_status = descs[i].len << E1000_ADVTXD_PAYLEN_SHIFT; + + /* FIXME: This sets the Report Status (RS) bit for every + * descriptor. One nice to have optimization would be to set it + * only for the last descriptor in the whole batch. See Intel + * ice driver for an example on how to do it. + */ + cmd_type |= descs[i].len | IGB_TXD_DCMD; + tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type); + tx_desc->read.olinfo_status = cpu_to_le32(olinfo_status); + + total_bytes += descs[i].len; + + i++; + tx_ring->next_to_use++; + tx_buffer_info->next_to_watch = tx_desc; + if (tx_ring->next_to_use == tx_ring->count) + tx_ring->next_to_use = 0; + } + + netdev_tx_sent_queue(txring_txq(tx_ring), total_bytes); + igb_xdp_ring_update_tail(tx_ring); + + return nb_pkts < budget; +} + int igb_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags) { struct igb_adapter *adapter = netdev_priv(dev);