From patchwork Fri Aug 16 09:24:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kurt Kanzenbach X-Patchwork-Id: 13765812 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 517D613F426; Fri, 16 Aug 2024 09:24:14 +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=1723800256; cv=none; b=ULeSbUsSfxX/E0CPFKILqZdv1dWvcMkve3y/AHcC60n1mqMPAoYYDmkAgIS4+f69JxyHKo6X6wIdhAY32ihhpL44irBMNQ34NKBihGm6SiS/1PH4k/LYUxovkCTFydDA3dgKBbtvK2oNI1Go3PKGt7lfbdiszQDNI37pVE/1ZnA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723800256; c=relaxed/simple; bh=zwqVV72Zbny6oJwgOYdzdOqVoBp8a4C1br611q5SXXA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=j/rs70uNDXdZy6dHTMl2pXiY+fJncdSFIWXdFoWsHxQpUBkUKbj0enCKY1m3JVOS2XPe4rd95LRZD3Ki88Q8Uqn5nP9KW3P53AzFLxABg5MvSZqd9YLpsQa+1ccvPZoXyADaq7wev41UWnN7EII+3Jl0In0qQPAwhFEWOUPHzUE= 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=ldmwSP7l; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=NqyEh+An; 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="ldmwSP7l"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="NqyEh+An" From: Kurt Kanzenbach DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1723800247; 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=4RaBDnckgLsEADXQ5SmWoAlA9svRPFOwL49saaqXgkw=; b=ldmwSP7laHsNK8fZ8Eb9KmgHBaF0JKP40CNNJ4lphatYBIDbfRSOhR+DMKM6QuC3p0/Okp USxSM1aqDNd2NkLQV2cJf1FAyVTxgOkiEQ3TRzMYbY8xjbcZoYDRLGT0EfdG0z/aimQLh4 pjfz3DfliSTLejWslvvUlsfPzee2pmnEvxdXmClP8ANHLwcymAFqNL8NrK4pCHFzvmO14B eaGT+eLuUWLBR6MmbdGEwMXjmFtzwXKIbOfWSc0+4/o93f095sg8OWWiyTFVyZbwUEhPyo /giIBL293Pd4eb4Nq8Q3Rb+bdAptPrB7SOgplDx8HNtKBetYnVc0u+qrG16GoA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1723800247; 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=4RaBDnckgLsEADXQ5SmWoAlA9svRPFOwL49saaqXgkw=; b=NqyEh+AnRixwFos1pA6pmbaSxp466dPyPahBqt9mbt4QUBuV0/Las2pFm5hfI8XJ7xTGmn UwWI6EtnmXc3T2CA== Date: Fri, 16 Aug 2024 11:24:03 +0200 Subject: [PATCH iwl-next v6 4/6] igb: Introduce XSK data structures and helpers Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240711-b4-igb_zero_copy-v6-4-4bfb68773b18@linutronix.de> References: <20240711-b4-igb_zero_copy-v6-0-4bfb68773b18@linutronix.de> In-Reply-To: <20240711-b4-igb_zero_copy-v6-0-4bfb68773b18@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=10214; i=kurt@linutronix.de; h=from:subject:message-id; bh=RKBGCq7JD2rG3Y9Ymi6uliDDlkk8sghR1sc8hDYXu1w=; b=owEBbQKS/ZANAwAKAcGT0fKqRnOCAcsmYgBmvxqy0i3lA7k2UlCI2iIs3y43SStz0NiVlN9/R F1H1tyOL/yJAjMEAAEKAB0WIQS8ub+yyMN909/bWZLBk9HyqkZzggUCZr8asgAKCRDBk9HyqkZz gpZmD/9x1W+FaTDDaCkxXg+q2smJuZVPJQKb4xVdzudULPB1uUeiDWD0EByoY3r4eAuGX1dy7py zMkH1NwSnNiCFuLzeK+VizI7lLk4PFfhFDV6WSGo4T3vVTn9oA3UWZrJuUciEXbflNkht77qjX2 n5OT1FMOnNXliSXa3vvpfGOTwzH5YxVdYbO87zccH/dw5I9OeqLTNJmj3QBjSfmVFM7aw4TBJkB eOH1Fp8SzFaISTIUIDSIfq9f6cESfCgTCO/Xa9PwMTMo+xgw4cSZHaKfaBW9oNqNJj1og6NJdAq IJUl8QuEjf3dG54Xxb6EeGxq2AC8RZwR/Ejfuo1HPHn9w8qHOVFRneb8cFP0clTwmFYY2KJySMD YlmP2yI43/jEakG8oK0zh/+buf0ECh5wEbD41UTFjQ+9Egu9dZtiASvQhMSl7cVvPxM2zfnz7MP CO+d+vr75yu4eBHophJC8/wh3LlPTh+lOKdtrd3/kK8igC0FB/0U/AmjDSNVSc6EOSnASyDE1TY ZAUxsEA954Ar35n6tA21mEEykH6SQjHJrRkBzS+Q0YtJfJEjfGaz8wemXYSm30TeA0QRvumUPyo vcGrEl0wmcncSzBDhPVxfa86uKPT/5yBp4QAauXcJLdCB6xJF09dNU6/92gH1U5fUnh8wJrVABm 6/PQ9eXfTCxFmng== X-Developer-Key: i=kurt@linutronix.de; a=openpgp; fpr=BCB9BFB2C8C37DD3DFDB5992C193D1F2AA467382 X-Patchwork-Delegate: kuba@kernel.org From: Sriram Yagnaraman Add the following ring flag: - IGB_RING_FLAG_TX_DISABLED (when xsk pool is being setup) Add a xdp_buff array for use with XSK receive batch API, and a pointer to xsk_pool in igb_adapter. Add enable/disable functions for TX and RX rings. Add enable/disable functions for XSK pool. Add xsk wakeup function. None of the above functionality will be active until NETDEV_XDP_ACT_XSK_ZEROCOPY is advertised in netdev->xdp_features. Signed-off-by: Sriram Yagnaraman [Kurt: Add READ/WRITE_ONCE(), synchronize_net(), remove IGB_RING_FLAG_AF_XDP_ZC] Signed-off-by: Kurt Kanzenbach Reviewed-by: Maciej Fijalkowski --- drivers/net/ethernet/intel/igb/Makefile | 2 +- drivers/net/ethernet/intel/igb/igb.h | 13 +- drivers/net/ethernet/intel/igb/igb_main.c | 9 ++ drivers/net/ethernet/intel/igb/igb_xsk.c | 207 ++++++++++++++++++++++++++++++ 4 files changed, 229 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/igb/Makefile b/drivers/net/ethernet/intel/igb/Makefile index 463c0d26b9d4..6c1b702fd992 100644 --- a/drivers/net/ethernet/intel/igb/Makefile +++ b/drivers/net/ethernet/intel/igb/Makefile @@ -8,4 +8,4 @@ obj-$(CONFIG_IGB) += igb.o igb-y := igb_main.o igb_ethtool.o e1000_82575.o \ e1000_mac.o e1000_nvm.o e1000_phy.o e1000_mbx.o \ - e1000_i210.o igb_ptp.o igb_hwmon.o + e1000_i210.o igb_ptp.o igb_hwmon.o igb_xsk.o diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h index dbba193241b9..8db5b44b4576 100644 --- a/drivers/net/ethernet/intel/igb/igb.h +++ b/drivers/net/ethernet/intel/igb/igb.h @@ -20,6 +20,7 @@ #include #include +#include struct igb_adapter; @@ -320,6 +321,7 @@ struct igb_ring { union { /* array of buffer info structs */ struct igb_tx_buffer *tx_buffer_info; struct igb_rx_buffer *rx_buffer_info; + struct xdp_buff **rx_buffer_info_zc; }; void *desc; /* descriptor ring memory */ unsigned long flags; /* ring specific flags */ @@ -357,6 +359,7 @@ struct igb_ring { }; }; struct xdp_rxq_info xdp_rxq; + struct xsk_buff_pool *xsk_pool; } ____cacheline_internodealigned_in_smp; struct igb_q_vector { @@ -384,7 +387,8 @@ enum e1000_ring_flags_t { IGB_RING_FLAG_RX_SCTP_CSUM, IGB_RING_FLAG_RX_LB_VLAN_BSWAP, IGB_RING_FLAG_TX_CTX_IDX, - IGB_RING_FLAG_TX_DETECT_HANG + IGB_RING_FLAG_TX_DETECT_HANG, + IGB_RING_FLAG_TX_DISABLED }; #define ring_uses_large_buffer(ring) \ @@ -820,4 +824,11 @@ int igb_add_mac_steering_filter(struct igb_adapter *adapter, int igb_del_mac_steering_filter(struct igb_adapter *adapter, const u8 *addr, u8 queue, u8 flags); +struct xsk_buff_pool *igb_xsk_pool(struct igb_adapter *adapter, + struct igb_ring *ring); +int igb_xsk_pool_setup(struct igb_adapter *adapter, + struct xsk_buff_pool *pool, + u16 qid); +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 db1598876424..9234c768a600 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -2904,9 +2904,14 @@ static int igb_xdp_setup(struct net_device *dev, struct netdev_bpf *bpf) static int igb_xdp(struct net_device *dev, struct netdev_bpf *xdp) { + struct igb_adapter *adapter = netdev_priv(dev); + switch (xdp->command) { case XDP_SETUP_PROG: return igb_xdp_setup(dev, xdp); + case XDP_SETUP_XSK_POOL: + return igb_xsk_pool_setup(adapter, xdp->xsk.pool, + xdp->xsk.queue_id); default: return -EINVAL; } @@ -3035,6 +3040,7 @@ static const struct net_device_ops igb_netdev_ops = { .ndo_setup_tc = igb_setup_tc, .ndo_bpf = igb_xdp, .ndo_xdp_xmit = igb_xdp_xmit, + .ndo_xsk_wakeup = igb_xsk_wakeup, }; /** @@ -4357,6 +4363,8 @@ void igb_configure_tx_ring(struct igb_adapter *adapter, u64 tdba = ring->dma; int reg_idx = ring->reg_idx; + WRITE_ONCE(ring->xsk_pool, igb_xsk_pool(adapter, ring)); + wr32(E1000_TDLEN(reg_idx), ring->count * sizeof(union e1000_adv_tx_desc)); wr32(E1000_TDBAL(reg_idx), @@ -4752,6 +4760,7 @@ void igb_configure_rx_ring(struct igb_adapter *adapter, xdp_rxq_info_unreg_mem_model(&ring->xdp_rxq); WARN_ON(xdp_rxq_info_reg_mem_model(&ring->xdp_rxq, MEM_TYPE_PAGE_SHARED, NULL)); + WRITE_ONCE(ring->xsk_pool, igb_xsk_pool(adapter, ring)); /* disable the queue */ wr32(E1000_RXDCTL(reg_idx), 0); diff --git a/drivers/net/ethernet/intel/igb/igb_xsk.c b/drivers/net/ethernet/intel/igb/igb_xsk.c new file mode 100644 index 000000000000..7b632be3e7e3 --- /dev/null +++ b/drivers/net/ethernet/intel/igb/igb_xsk.c @@ -0,0 +1,207 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright(c) 2018 Intel Corporation. */ + +#include +#include +#include + +#include "e1000_hw.h" +#include "igb.h" + +static int igb_realloc_rx_buffer_info(struct igb_ring *ring, bool pool_present) +{ + int size = pool_present ? + sizeof(*ring->rx_buffer_info_zc) * ring->count : + sizeof(*ring->rx_buffer_info) * ring->count; + void *buff_info = vmalloc(size); + + if (!buff_info) + return -ENOMEM; + + if (pool_present) { + vfree(ring->rx_buffer_info); + ring->rx_buffer_info = NULL; + ring->rx_buffer_info_zc = buff_info; + } else { + vfree(ring->rx_buffer_info_zc); + ring->rx_buffer_info_zc = NULL; + ring->rx_buffer_info = buff_info; + } + + return 0; +} + +static void igb_txrx_ring_disable(struct igb_adapter *adapter, u16 qid) +{ + struct igb_ring *tx_ring = adapter->tx_ring[qid]; + struct igb_ring *rx_ring = adapter->rx_ring[qid]; + struct e1000_hw *hw = &adapter->hw; + + set_bit(IGB_RING_FLAG_TX_DISABLED, &tx_ring->flags); + + wr32(E1000_TXDCTL(tx_ring->reg_idx), 0); + wr32(E1000_RXDCTL(rx_ring->reg_idx), 0); + + synchronize_net(); + + /* Rx/Tx share the same napi context. */ + napi_disable(&rx_ring->q_vector->napi); + + igb_clean_tx_ring(tx_ring); + igb_clean_rx_ring(rx_ring); + + memset(&rx_ring->rx_stats, 0, sizeof(rx_ring->rx_stats)); + memset(&tx_ring->tx_stats, 0, sizeof(tx_ring->tx_stats)); +} + +static void igb_txrx_ring_enable(struct igb_adapter *adapter, u16 qid) +{ + struct igb_ring *tx_ring = adapter->tx_ring[qid]; + struct igb_ring *rx_ring = adapter->rx_ring[qid]; + + igb_configure_tx_ring(adapter, tx_ring); + igb_configure_rx_ring(adapter, rx_ring); + + synchronize_net(); + + clear_bit(IGB_RING_FLAG_TX_DISABLED, &tx_ring->flags); + + /* call igb_desc_unused which always leaves + * at least 1 descriptor unused to make sure + * next_to_use != next_to_clean + */ + igb_alloc_rx_buffers(rx_ring, igb_desc_unused(rx_ring)); + + /* Rx/Tx share the same napi context. */ + napi_enable(&rx_ring->q_vector->napi); +} + +struct xsk_buff_pool *igb_xsk_pool(struct igb_adapter *adapter, + struct igb_ring *ring) +{ + int qid = ring->queue_index; + struct xsk_buff_pool *pool; + + pool = xsk_get_pool_from_qid(adapter->netdev, qid); + + if (!igb_xdp_is_enabled(adapter)) + return NULL; + + return (pool && pool->dev) ? pool : NULL; +} + +static int igb_xsk_pool_enable(struct igb_adapter *adapter, + struct xsk_buff_pool *pool, + u16 qid) +{ + struct net_device *netdev = adapter->netdev; + struct igb_ring *rx_ring; + bool if_running; + int err; + + if (qid >= adapter->num_rx_queues) + return -EINVAL; + + if (qid >= netdev->real_num_rx_queues || + qid >= netdev->real_num_tx_queues) + return -EINVAL; + + err = xsk_pool_dma_map(pool, &adapter->pdev->dev, IGB_RX_DMA_ATTR); + if (err) + return err; + + rx_ring = adapter->rx_ring[qid]; + if_running = netif_running(adapter->netdev) && igb_xdp_is_enabled(adapter); + if (if_running) + igb_txrx_ring_disable(adapter, qid); + + if (if_running) { + err = igb_realloc_rx_buffer_info(rx_ring, true); + if (!err) { + igb_txrx_ring_enable(adapter, qid); + /* Kick start the NAPI context so that receiving will start */ + err = igb_xsk_wakeup(adapter->netdev, qid, XDP_WAKEUP_RX); + } + + if (err) { + xsk_pool_dma_unmap(pool, IGB_RX_DMA_ATTR); + return err; + } + } + + return 0; +} + +static int igb_xsk_pool_disable(struct igb_adapter *adapter, u16 qid) +{ + struct xsk_buff_pool *pool; + struct igb_ring *rx_ring; + bool if_running; + int err; + + pool = xsk_get_pool_from_qid(adapter->netdev, qid); + if (!pool) + return -EINVAL; + + rx_ring = adapter->rx_ring[qid]; + if_running = netif_running(adapter->netdev) && igb_xdp_is_enabled(adapter); + if (if_running) + igb_txrx_ring_disable(adapter, qid); + + xsk_pool_dma_unmap(pool, IGB_RX_DMA_ATTR); + + if (if_running) { + err = igb_realloc_rx_buffer_info(rx_ring, false); + if (err) + return err; + + igb_txrx_ring_enable(adapter, qid); + } + + return 0; +} + +int igb_xsk_pool_setup(struct igb_adapter *adapter, + struct xsk_buff_pool *pool, + u16 qid) +{ + return pool ? igb_xsk_pool_enable(adapter, pool, qid) : + igb_xsk_pool_disable(adapter, qid); +} + +int igb_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags) +{ + struct igb_adapter *adapter = netdev_priv(dev); + struct e1000_hw *hw = &adapter->hw; + struct igb_ring *ring; + u32 eics = 0; + + if (test_bit(__IGB_DOWN, &adapter->state)) + return -ENETDOWN; + + if (!igb_xdp_is_enabled(adapter)) + return -EINVAL; + + if (qid >= adapter->num_tx_queues) + return -EINVAL; + + ring = adapter->tx_ring[qid]; + + if (test_bit(IGB_RING_FLAG_TX_DISABLED, &ring->flags)) + return -ENETDOWN; + + if (!READ_ONCE(ring->xsk_pool)) + return -EINVAL; + + if (!napi_if_scheduled_mark_missed(&ring->q_vector->napi)) { + /* Cause software interrupt */ + if (adapter->flags & IGB_FLAG_HAS_MSIX) { + eics |= ring->q_vector->eims_value; + wr32(E1000_EICS, eics); + } else { + wr32(E1000_ICS, E1000_ICS_RXDMT0); + } + } + + return 0; +}