Resguardo inicial

linux-7.2.3/drivers/net/ethernet/amazon/ena/Makefile

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the Elastic Network Adapter (ENA) device drivers.
+#
+
+obj-$(CONFIG_ENA_ETHERNET) += ena.o
+
+ena-y := ena_netdev.o ena_com.o ena_eth_com.o ena_ethtool.o ena_xdp.o ena_phc.o ena_devlink.o ena_debugfs.o

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_common_defs.h

@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/*
+ * Copyright 2015-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+#ifndef _ENA_COMMON_H_
+#define _ENA_COMMON_H_
+
+#define ENA_COMMON_SPEC_VERSION_MAJOR        2
+#define ENA_COMMON_SPEC_VERSION_MINOR        0
+
+/* ENA operates with 48-bit memory addresses. ena_mem_addr_t */
+struct ena_common_mem_addr {
+	u32 mem_addr_low;
+
+	u16 mem_addr_high;
+
+	/* MBZ */
+	u16 reserved16;
+};
+
+#endif /* _ENA_COMMON_H_ */

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_debugfs.c

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* Copyright (c) Amazon.com, Inc. or its affiliates.
+ * All rights reserved.
+ */
+
+#ifdef CONFIG_DEBUG_FS
+
+#include <linux/seq_file.h>
+#include <linux/pci.h>
+#include "ena_debugfs.h"
+#include "ena_phc.h"
+
+static int phc_stats_show(struct seq_file *file, void *priv)
+{
+	struct ena_adapter *adapter = file->private;
+
+	if (!ena_phc_is_active(adapter))
+		return 0;
+
+	seq_printf(file,
+		   "phc_cnt: %llu\n",
+		   adapter->ena_dev->phc.stats.phc_cnt);
+	seq_printf(file,
+		   "phc_exp: %llu\n",
+		   adapter->ena_dev->phc.stats.phc_exp);
+	seq_printf(file,
+		   "phc_skp: %llu\n",
+		   adapter->ena_dev->phc.stats.phc_skp);
+	seq_printf(file,
+		   "phc_err_dv: %llu\n",
+		   adapter->ena_dev->phc.stats.phc_err_dv);
+	seq_printf(file,
+		   "phc_err_ts: %llu\n",
+		   adapter->ena_dev->phc.stats.phc_err_ts);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(phc_stats);
+
+void ena_debugfs_init(struct net_device *dev)
+{
+	struct ena_adapter *adapter = netdev_priv(dev);
+
+	adapter->debugfs_base =
+		debugfs_create_dir(dev_name(&adapter->pdev->dev), NULL);
+
+	debugfs_create_file("phc_stats",
+			    0400,
+			    adapter->debugfs_base,
+			    adapter,
+			    &phc_stats_fops);
+}
+
+void ena_debugfs_terminate(struct net_device *dev)
+{
+	struct ena_adapter *adapter = netdev_priv(dev);
+
+	debugfs_remove_recursive(adapter->debugfs_base);
+}
+
+#endif /* CONFIG_DEBUG_FS */

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_debugfs.h

@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) Amazon.com, Inc. or its affiliates.
+ * All rights reserved.
+ */
+
+#ifndef __ENA_DEBUGFS_H__
+#define __ENA_DEBUGFS_H__
+
+#include <linux/debugfs.h>
+#include <linux/netdevice.h>
+#include "ena_netdev.h"
+
+#ifdef CONFIG_DEBUG_FS
+
+void ena_debugfs_init(struct net_device *dev);
+
+void ena_debugfs_terminate(struct net_device *dev);
+
+#else /* CONFIG_DEBUG_FS */
+
+static inline void ena_debugfs_init(struct net_device *dev) {}
+
+static inline void ena_debugfs_terminate(struct net_device *dev) {}
+
+#endif /* CONFIG_DEBUG_FS */
+
+#endif /* __ENA_DEBUGFS_H__ */

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_devlink.c

@@ -0,0 +1,214 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* Copyright (c) Amazon.com, Inc. or its affiliates.
+ * All rights reserved.
+ */
+
+#include "linux/pci.h"
+#include "ena_devlink.h"
+#include "ena_phc.h"
+
+static int ena_devlink_enable_phc_validate(struct devlink *devlink, u32 id,
+					   union devlink_param_value *val,
+					   struct netlink_ext_ack *extack)
+{
+	struct ena_adapter *adapter = ENA_DEVLINK_PRIV(devlink);
+
+	if (!val->vbool)
+		return 0;
+
+	if (!ena_com_phc_supported(adapter->ena_dev)) {
+		NL_SET_ERR_MSG_MOD(extack, "Device doesn't support PHC");
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static const struct devlink_param ena_devlink_params[] = {
+	DEVLINK_PARAM_GENERIC(ENABLE_PHC,
+			      BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
+			      NULL,
+			      NULL,
+			      ena_devlink_enable_phc_validate),
+};
+
+void ena_devlink_params_get(struct devlink *devlink)
+{
+	struct ena_adapter *adapter = ENA_DEVLINK_PRIV(devlink);
+	union devlink_param_value val;
+	int err;
+
+	err = devl_param_driverinit_value_get(devlink,
+					      DEVLINK_PARAM_GENERIC_ID_ENABLE_PHC,
+					      &val);
+	if (err) {
+		netdev_err(adapter->netdev, "Failed to query PHC param\n");
+		return;
+	}
+
+	ena_phc_enable(adapter, val.vbool);
+}
+
+void ena_devlink_disable_phc_param(struct devlink *devlink)
+{
+	union devlink_param_value value;
+
+	devl_lock(devlink);
+	value.vbool = false;
+	devl_param_driverinit_value_set(devlink,
+					DEVLINK_PARAM_GENERIC_ID_ENABLE_PHC,
+					&value);
+	devl_unlock(devlink);
+}
+
+static void ena_devlink_port_register(struct devlink *devlink)
+{
+	struct ena_adapter *adapter = ENA_DEVLINK_PRIV(devlink);
+	struct devlink_port_attrs attrs = {};
+
+	attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
+	devlink_port_attrs_set(&adapter->devlink_port, &attrs);
+	devl_port_register(devlink, &adapter->devlink_port, 0);
+}
+
+static void ena_devlink_port_unregister(struct devlink *devlink)
+{
+	struct ena_adapter *adapter = ENA_DEVLINK_PRIV(devlink);
+
+	devl_port_unregister(&adapter->devlink_port);
+}
+
+static int ena_devlink_reload_down(struct devlink *devlink,
+				   bool netns_change,
+				   enum devlink_reload_action action,
+				   enum devlink_reload_limit limit,
+				   struct netlink_ext_ack *extack)
+{
+	struct ena_adapter *adapter = ENA_DEVLINK_PRIV(devlink);
+
+	if (netns_change) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Namespace change is not supported");
+		return -EOPNOTSUPP;
+	}
+
+	ena_devlink_port_unregister(devlink);
+
+	rtnl_lock();
+	ena_destroy_device(adapter, false);
+	rtnl_unlock();
+
+	return 0;
+}
+
+static int ena_devlink_reload_up(struct devlink *devlink,
+				 enum devlink_reload_action action,
+				 enum devlink_reload_limit limit,
+				 u32 *actions_performed,
+				 struct netlink_ext_ack *extack)
+{
+	struct ena_adapter *adapter = ENA_DEVLINK_PRIV(devlink);
+	int err = 0;
+
+	rtnl_lock();
+	/* Check that no other routine initialized the device (e.g.
+	 * ena_fw_reset_device()). Also we're under devlink_mutex here,
+	 * so devlink isn't freed under our feet.
+	 */
+	if (!test_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags))
+		err = ena_restore_device(adapter);
+
+	rtnl_unlock();
+
+	ena_devlink_port_register(devlink);
+
+	if (!err)
+		*actions_performed = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT);
+
+	return err;
+}
+
+static const struct devlink_ops ena_devlink_ops = {
+	.reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT),
+	.reload_down	= ena_devlink_reload_down,
+	.reload_up	= ena_devlink_reload_up,
+};
+
+static int ena_devlink_configure_params(struct devlink *devlink)
+{
+	struct ena_adapter *adapter = ENA_DEVLINK_PRIV(devlink);
+	union devlink_param_value value;
+	int rc;
+
+	rc = devlink_params_register(devlink, ena_devlink_params,
+				     ARRAY_SIZE(ena_devlink_params));
+	if (rc) {
+		netdev_err(adapter->netdev, "Failed to register devlink params\n");
+		return rc;
+	}
+
+	devl_lock(devlink);
+	value.vbool = ena_phc_is_enabled(adapter);
+	devl_param_driverinit_value_set(devlink,
+					DEVLINK_PARAM_GENERIC_ID_ENABLE_PHC,
+					&value);
+	devl_unlock(devlink);
+
+	return 0;
+}
+
+struct devlink *ena_devlink_alloc(struct ena_adapter *adapter)
+{
+	struct device *dev = &adapter->pdev->dev;
+	struct devlink *devlink;
+
+	devlink = devlink_alloc(&ena_devlink_ops,
+				sizeof(struct ena_adapter *),
+				dev);
+	if (!devlink) {
+		netdev_err(adapter->netdev,
+			   "Failed to allocate devlink struct\n");
+		return NULL;
+	}
+
+	ENA_DEVLINK_PRIV(devlink) = adapter;
+	adapter->devlink = devlink;
+
+	if (ena_devlink_configure_params(devlink))
+		goto free_devlink;
+
+	return devlink;
+
+free_devlink:
+	devlink_free(devlink);
+	return NULL;
+}
+
+static void ena_devlink_configure_params_clean(struct devlink *devlink)
+{
+	devlink_params_unregister(devlink, ena_devlink_params,
+				  ARRAY_SIZE(ena_devlink_params));
+}
+
+void ena_devlink_free(struct devlink *devlink)
+{
+	ena_devlink_configure_params_clean(devlink);
+
+	devlink_free(devlink);
+}
+
+void ena_devlink_register(struct devlink *devlink, struct device *dev)
+{
+	devl_lock(devlink);
+	ena_devlink_port_register(devlink);
+	devl_register(devlink);
+	devl_unlock(devlink);
+}
+
+void ena_devlink_unregister(struct devlink *devlink)
+{
+	devl_lock(devlink);
+	ena_devlink_port_unregister(devlink);
+	devl_unregister(devlink);
+	devl_unlock(devlink);
+}

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_devlink.h

@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) Amazon.com, Inc. or its affiliates.
+ * All rights reserved.
+ */
+#ifndef DEVLINK_H
+#define DEVLINK_H
+
+#include "ena_netdev.h"
+#include <net/devlink.h>
+
+#define ENA_DEVLINK_PRIV(devlink) \
+	(*(struct ena_adapter **)devlink_priv(devlink))
+
+struct devlink *ena_devlink_alloc(struct ena_adapter *adapter);
+void ena_devlink_free(struct devlink *devlink);
+void ena_devlink_register(struct devlink *devlink, struct device *dev);
+void ena_devlink_unregister(struct devlink *devlink);
+void ena_devlink_params_get(struct devlink *devlink);
+void ena_devlink_disable_phc_param(struct devlink *devlink);
+
+#endif /* DEVLINK_H */

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_eth_com.c

@@ -0,0 +1,654 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/*
+ * Copyright 2015-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+
+#include "ena_eth_com.h"
+
+static struct ena_eth_io_rx_cdesc_base *ena_com_get_next_rx_cdesc(
+	struct ena_com_io_cq *io_cq)
+{
+	struct ena_eth_io_rx_cdesc_base *cdesc;
+	u16 expected_phase, head_masked;
+	u16 desc_phase;
+
+	head_masked = io_cq->head & (io_cq->q_depth - 1);
+	expected_phase = io_cq->phase;
+
+	cdesc = (struct ena_eth_io_rx_cdesc_base *)(io_cq->cdesc_addr.virt_addr
+			+ (head_masked * io_cq->cdesc_entry_size_in_bytes));
+
+	desc_phase = (READ_ONCE(cdesc->status) & ENA_ETH_IO_RX_CDESC_BASE_PHASE_MASK) >>
+		     ENA_ETH_IO_RX_CDESC_BASE_PHASE_SHIFT;
+
+	if (desc_phase != expected_phase)
+		return NULL;
+
+	/* Make sure we read the rest of the descriptor after the phase bit
+	 * has been read
+	 */
+	dma_rmb();
+
+	return cdesc;
+}
+
+static void *get_sq_desc_regular_queue(struct ena_com_io_sq *io_sq)
+{
+	u16 tail_masked;
+	u32 offset;
+
+	tail_masked = io_sq->tail & (io_sq->q_depth - 1);
+
+	offset = tail_masked * io_sq->desc_entry_size;
+
+	return (void *)((uintptr_t)io_sq->desc_addr.virt_addr + offset);
+}
+
+static int ena_com_write_bounce_buffer_to_dev(struct ena_com_io_sq *io_sq,
+						     u8 *bounce_buffer)
+{
+	struct ena_com_llq_info *llq_info = &io_sq->llq_info;
+
+	u16 dst_tail_mask;
+	u32 dst_offset;
+
+	dst_tail_mask = io_sq->tail & (io_sq->q_depth - 1);
+	dst_offset = dst_tail_mask * llq_info->desc_list_entry_size;
+
+	if (is_llq_max_tx_burst_exists(io_sq)) {
+		if (unlikely(!io_sq->entries_in_tx_burst_left)) {
+			netdev_err(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+				   "Error: trying to send more packets than tx burst allows\n");
+			return -ENOSPC;
+		}
+
+		io_sq->entries_in_tx_burst_left--;
+		netdev_dbg(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+			   "Decreasing entries_in_tx_burst_left of queue %d to %d\n", io_sq->qid,
+			   io_sq->entries_in_tx_burst_left);
+	}
+
+	/* Make sure everything was written into the bounce buffer before
+	 * writing the bounce buffer to the device
+	 */
+	wmb();
+
+	/* The line is completed. Copy it to dev */
+	__iowrite64_copy(io_sq->desc_addr.pbuf_dev_addr + dst_offset, bounce_buffer,
+			 (llq_info->desc_list_entry_size) / 8);
+
+	io_sq->tail++;
+
+	/* Switch phase bit in case of wrap around */
+	if (unlikely((io_sq->tail & (io_sq->q_depth - 1)) == 0))
+		io_sq->phase ^= 1;
+
+	return 0;
+}
+
+static int ena_com_write_header_to_bounce(struct ena_com_io_sq *io_sq,
+						 u8 *header_src,
+						 u16 header_len)
+{
+	struct ena_com_llq_pkt_ctrl *pkt_ctrl = &io_sq->llq_buf_ctrl;
+	struct ena_com_llq_info *llq_info = &io_sq->llq_info;
+	u8 *bounce_buffer = pkt_ctrl->curr_bounce_buf;
+	u16 header_offset;
+
+	if (unlikely(io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_HOST))
+		return 0;
+
+	header_offset =
+		llq_info->descs_num_before_header * io_sq->desc_entry_size;
+
+	if (unlikely((header_offset + header_len) > llq_info->desc_list_entry_size)) {
+		netdev_err(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+			   "Trying to write header larger than llq entry can accommodate\n");
+		return -EFAULT;
+	}
+
+	if (unlikely(!bounce_buffer)) {
+		netdev_err(ena_com_io_sq_to_ena_dev(io_sq)->net_device, "Bounce buffer is NULL\n");
+		return -EFAULT;
+	}
+
+	memcpy(bounce_buffer + header_offset, header_src, header_len);
+
+	return 0;
+}
+
+static void *get_sq_desc_llq(struct ena_com_io_sq *io_sq)
+{
+	struct ena_com_llq_pkt_ctrl *pkt_ctrl = &io_sq->llq_buf_ctrl;
+	u8 *bounce_buffer;
+	void *sq_desc;
+
+	bounce_buffer = pkt_ctrl->curr_bounce_buf;
+
+	if (unlikely(!bounce_buffer)) {
+		netdev_err(ena_com_io_sq_to_ena_dev(io_sq)->net_device, "Bounce buffer is NULL\n");
+		return NULL;
+	}
+
+	sq_desc = bounce_buffer + pkt_ctrl->idx * io_sq->desc_entry_size;
+	pkt_ctrl->idx++;
+	pkt_ctrl->descs_left_in_line--;
+
+	return sq_desc;
+}
+
+static int ena_com_close_bounce_buffer(struct ena_com_io_sq *io_sq)
+{
+	struct ena_com_llq_pkt_ctrl *pkt_ctrl = &io_sq->llq_buf_ctrl;
+	struct ena_com_llq_info *llq_info = &io_sq->llq_info;
+	int rc;
+
+	if (unlikely(io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_HOST))
+		return 0;
+
+	/* bounce buffer was used, so write it and get a new one */
+	if (likely(pkt_ctrl->idx)) {
+		rc = ena_com_write_bounce_buffer_to_dev(io_sq,
+							pkt_ctrl->curr_bounce_buf);
+		if (unlikely(rc)) {
+			netdev_err(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+				   "Failed to write bounce buffer to device\n");
+			return rc;
+		}
+
+		pkt_ctrl->curr_bounce_buf =
+			ena_com_get_next_bounce_buffer(&io_sq->bounce_buf_ctrl);
+		memset(io_sq->llq_buf_ctrl.curr_bounce_buf,
+		       0x0, llq_info->desc_list_entry_size);
+	}
+
+	pkt_ctrl->idx = 0;
+	pkt_ctrl->descs_left_in_line = llq_info->descs_num_before_header;
+	return 0;
+}
+
+static void *get_sq_desc(struct ena_com_io_sq *io_sq)
+{
+	if (io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV)
+		return get_sq_desc_llq(io_sq);
+
+	return get_sq_desc_regular_queue(io_sq);
+}
+
+static int ena_com_sq_update_llq_tail(struct ena_com_io_sq *io_sq)
+{
+	struct ena_com_llq_pkt_ctrl *pkt_ctrl = &io_sq->llq_buf_ctrl;
+	struct ena_com_llq_info *llq_info = &io_sq->llq_info;
+	int rc;
+
+	if (!pkt_ctrl->descs_left_in_line) {
+		rc = ena_com_write_bounce_buffer_to_dev(io_sq,
+							pkt_ctrl->curr_bounce_buf);
+		if (unlikely(rc)) {
+			netdev_err(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+				   "Failed to write bounce buffer to device\n");
+			return rc;
+		}
+
+		pkt_ctrl->curr_bounce_buf =
+			ena_com_get_next_bounce_buffer(&io_sq->bounce_buf_ctrl);
+		memset(io_sq->llq_buf_ctrl.curr_bounce_buf,
+		       0x0, llq_info->desc_list_entry_size);
+
+		pkt_ctrl->idx = 0;
+		if (unlikely(llq_info->desc_stride_ctrl == ENA_ADMIN_SINGLE_DESC_PER_ENTRY))
+			pkt_ctrl->descs_left_in_line = 1;
+		else
+			pkt_ctrl->descs_left_in_line =
+			llq_info->desc_list_entry_size / io_sq->desc_entry_size;
+	}
+
+	return 0;
+}
+
+static int ena_com_sq_update_tail(struct ena_com_io_sq *io_sq)
+{
+	if (io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV)
+		return ena_com_sq_update_llq_tail(io_sq);
+
+	io_sq->tail++;
+
+	/* Switch phase bit in case of wrap around */
+	if (unlikely((io_sq->tail & (io_sq->q_depth - 1)) == 0))
+		io_sq->phase ^= 1;
+
+	return 0;
+}
+
+static struct ena_eth_io_rx_cdesc_base *
+	ena_com_rx_cdesc_idx_to_ptr(struct ena_com_io_cq *io_cq, u16 idx)
+{
+	idx &= (io_cq->q_depth - 1);
+	return (struct ena_eth_io_rx_cdesc_base *)
+		((uintptr_t)io_cq->cdesc_addr.virt_addr +
+		idx * io_cq->cdesc_entry_size_in_bytes);
+}
+
+static int ena_com_cdesc_rx_pkt_get(struct ena_com_io_cq *io_cq,
+				    u16 *first_cdesc_idx,
+				    u16 *num_descs)
+{
+	u16 count = io_cq->cur_rx_pkt_cdesc_count, head_masked;
+	struct ena_eth_io_rx_cdesc_base *cdesc;
+	u32 last = 0;
+
+	do {
+		u32 status;
+
+		cdesc = ena_com_get_next_rx_cdesc(io_cq);
+		if (!cdesc)
+			break;
+		status = READ_ONCE(cdesc->status);
+
+		ena_com_cq_inc_head(io_cq);
+		if (unlikely((status & ENA_ETH_IO_RX_CDESC_BASE_FIRST_MASK) >>
+		    ENA_ETH_IO_RX_CDESC_BASE_FIRST_SHIFT && count != 0)) {
+			struct ena_com_dev *dev = ena_com_io_cq_to_ena_dev(io_cq);
+
+			netdev_err(dev->net_device,
+				   "First bit is on in descriptor #%d on q_id: %d, req_id: %u\n",
+				   count, io_cq->qid, cdesc->req_id);
+			return -EFAULT;
+		}
+		count++;
+		last = (status & ENA_ETH_IO_RX_CDESC_BASE_LAST_MASK) >>
+			ENA_ETH_IO_RX_CDESC_BASE_LAST_SHIFT;
+	} while (!last);
+
+	if (last) {
+		*first_cdesc_idx = io_cq->cur_rx_pkt_cdesc_start_idx;
+
+		head_masked = io_cq->head & (io_cq->q_depth - 1);
+
+		*num_descs = count;
+		io_cq->cur_rx_pkt_cdesc_count = 0;
+		io_cq->cur_rx_pkt_cdesc_start_idx = head_masked;
+
+		netdev_dbg(ena_com_io_cq_to_ena_dev(io_cq)->net_device,
+			   "ENA q_id: %d packets were completed. first desc idx %u descs# %d\n",
+			   io_cq->qid, *first_cdesc_idx, count);
+	} else {
+		io_cq->cur_rx_pkt_cdesc_count = count;
+		*num_descs = 0;
+	}
+
+	return 0;
+}
+
+static int ena_com_create_meta(struct ena_com_io_sq *io_sq,
+			       struct ena_com_tx_meta *ena_meta)
+{
+	struct ena_eth_io_tx_meta_desc *meta_desc = NULL;
+
+	meta_desc = get_sq_desc(io_sq);
+	if (unlikely(!meta_desc))
+		return -EFAULT;
+
+	memset(meta_desc, 0x0, sizeof(struct ena_eth_io_tx_meta_desc));
+
+	meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_META_DESC_MASK;
+
+	meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_EXT_VALID_MASK;
+
+	/* bits 0-9 of the mss */
+	meta_desc->word2 |= ((u32)ena_meta->mss <<
+		ENA_ETH_IO_TX_META_DESC_MSS_LO_SHIFT) &
+		ENA_ETH_IO_TX_META_DESC_MSS_LO_MASK;
+	/* bits 10-13 of the mss */
+	meta_desc->len_ctrl |= ((ena_meta->mss >> 10) <<
+		ENA_ETH_IO_TX_META_DESC_MSS_HI_SHIFT) &
+		ENA_ETH_IO_TX_META_DESC_MSS_HI_MASK;
+
+	/* Extended meta desc */
+	meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_ETH_META_TYPE_MASK;
+	meta_desc->len_ctrl |= ((u32)io_sq->phase <<
+		ENA_ETH_IO_TX_META_DESC_PHASE_SHIFT) &
+		ENA_ETH_IO_TX_META_DESC_PHASE_MASK;
+
+	meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_FIRST_MASK;
+	meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_META_STORE_MASK;
+
+	meta_desc->word2 |= ena_meta->l3_hdr_len &
+		ENA_ETH_IO_TX_META_DESC_L3_HDR_LEN_MASK;
+	meta_desc->word2 |= (ena_meta->l3_hdr_offset <<
+		ENA_ETH_IO_TX_META_DESC_L3_HDR_OFF_SHIFT) &
+		ENA_ETH_IO_TX_META_DESC_L3_HDR_OFF_MASK;
+
+	meta_desc->word2 |= ((u32)ena_meta->l4_hdr_len <<
+		ENA_ETH_IO_TX_META_DESC_L4_HDR_LEN_IN_WORDS_SHIFT) &
+		ENA_ETH_IO_TX_META_DESC_L4_HDR_LEN_IN_WORDS_MASK;
+
+	return ena_com_sq_update_tail(io_sq);
+}
+
+static int ena_com_create_and_store_tx_meta_desc(struct ena_com_io_sq *io_sq,
+						 struct ena_com_tx_ctx *ena_tx_ctx,
+						 bool *have_meta)
+{
+	struct ena_com_tx_meta *ena_meta = &ena_tx_ctx->ena_meta;
+
+	/* When disable meta caching is set, don't bother to save the meta and
+	 * compare it to the stored version, just create the meta
+	 */
+	if (io_sq->disable_meta_caching) {
+		*have_meta = true;
+		return ena_com_create_meta(io_sq, ena_meta);
+	}
+
+	if (ena_com_meta_desc_changed(io_sq, ena_tx_ctx)) {
+		*have_meta = true;
+		/* Cache the meta desc */
+		memcpy(&io_sq->cached_tx_meta, ena_meta,
+		       sizeof(struct ena_com_tx_meta));
+		return ena_com_create_meta(io_sq, ena_meta);
+	}
+
+	*have_meta = false;
+	return 0;
+}
+
+static void ena_com_rx_set_flags(struct ena_com_io_cq *io_cq,
+				 struct ena_com_rx_ctx *ena_rx_ctx,
+				 struct ena_eth_io_rx_cdesc_base *cdesc)
+{
+	ena_rx_ctx->l3_proto = cdesc->status &
+		ENA_ETH_IO_RX_CDESC_BASE_L3_PROTO_IDX_MASK;
+	ena_rx_ctx->l4_proto =
+		(cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_L4_PROTO_IDX_MASK) >>
+		ENA_ETH_IO_RX_CDESC_BASE_L4_PROTO_IDX_SHIFT;
+	ena_rx_ctx->l3_csum_err =
+		!!((cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_L3_CSUM_ERR_MASK) >>
+		ENA_ETH_IO_RX_CDESC_BASE_L3_CSUM_ERR_SHIFT);
+	ena_rx_ctx->l4_csum_err =
+		!!((cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_ERR_MASK) >>
+		ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_ERR_SHIFT);
+	ena_rx_ctx->l4_csum_checked =
+		!!((cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_CHECKED_MASK) >>
+		ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_CHECKED_SHIFT);
+	ena_rx_ctx->hash = cdesc->hash;
+	ena_rx_ctx->frag =
+		(cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_IPV4_FRAG_MASK) >>
+		ENA_ETH_IO_RX_CDESC_BASE_IPV4_FRAG_SHIFT;
+
+	netdev_dbg(ena_com_io_cq_to_ena_dev(io_cq)->net_device,
+		   "l3_proto %d l4_proto %d l3_csum_err %d l4_csum_err %d hash %d frag %d cdesc_status %x\n",
+		   ena_rx_ctx->l3_proto, ena_rx_ctx->l4_proto, ena_rx_ctx->l3_csum_err,
+		   ena_rx_ctx->l4_csum_err, ena_rx_ctx->hash, ena_rx_ctx->frag, cdesc->status);
+}
+
+/*****************************************************************************/
+/*****************************     API      **********************************/
+/*****************************************************************************/
+
+int ena_com_prepare_tx(struct ena_com_io_sq *io_sq,
+		       struct ena_com_tx_ctx *ena_tx_ctx,
+		       int *nb_hw_desc)
+{
+	struct ena_eth_io_tx_desc *desc = NULL;
+	struct ena_com_buf *ena_bufs = ena_tx_ctx->ena_bufs;
+	void *buffer_to_push = ena_tx_ctx->push_header;
+	u16 header_len = ena_tx_ctx->header_len;
+	u16 num_bufs = ena_tx_ctx->num_bufs;
+	u16 start_tail = io_sq->tail;
+	int i, rc;
+	bool have_meta;
+	u64 addr_hi;
+
+	WARN(io_sq->direction != ENA_COM_IO_QUEUE_DIRECTION_TX, "wrong Q type");
+
+	/* num_bufs +1 for potential meta desc */
+	if (unlikely(!ena_com_sq_have_enough_space(io_sq, num_bufs + 1))) {
+		netdev_dbg(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+			   "Not enough space in the tx queue\n");
+		return -ENOMEM;
+	}
+
+	if (unlikely(header_len > io_sq->tx_max_header_size)) {
+		netdev_err(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+			   "Header size is too large %d max header: %d\n", header_len,
+			   io_sq->tx_max_header_size);
+		return -EINVAL;
+	}
+
+	if (unlikely(io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV && !buffer_to_push)) {
+		netdev_err(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+			   "Push header wasn't provided in LLQ mode\n");
+		return -EINVAL;
+	}
+
+	rc = ena_com_write_header_to_bounce(io_sq, buffer_to_push, header_len);
+	if (unlikely(rc))
+		return rc;
+
+	rc = ena_com_create_and_store_tx_meta_desc(io_sq, ena_tx_ctx, &have_meta);
+	if (unlikely(rc)) {
+		netdev_err(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+			   "Failed to create and store tx meta desc\n");
+		return rc;
+	}
+
+	/* If the caller doesn't want to send packets */
+	if (unlikely(!num_bufs && !header_len)) {
+		rc = ena_com_close_bounce_buffer(io_sq);
+		if (rc)
+			netdev_err(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+				   "Failed to write buffers to LLQ\n");
+		*nb_hw_desc = io_sq->tail - start_tail;
+		return rc;
+	}
+
+	desc = get_sq_desc(io_sq);
+	if (unlikely(!desc))
+		return -EFAULT;
+	memset(desc, 0x0, sizeof(struct ena_eth_io_tx_desc));
+
+	/* Set first desc when we don't have meta descriptor */
+	if (!have_meta)
+		desc->len_ctrl |= ENA_ETH_IO_TX_DESC_FIRST_MASK;
+
+	desc->buff_addr_hi_hdr_sz |= ((u32)header_len <<
+		ENA_ETH_IO_TX_DESC_HEADER_LENGTH_SHIFT) &
+		ENA_ETH_IO_TX_DESC_HEADER_LENGTH_MASK;
+	desc->len_ctrl |= ((u32)io_sq->phase << ENA_ETH_IO_TX_DESC_PHASE_SHIFT) &
+		ENA_ETH_IO_TX_DESC_PHASE_MASK;
+
+	desc->len_ctrl |= ENA_ETH_IO_TX_DESC_COMP_REQ_MASK;
+
+	/* Bits 0-9 */
+	desc->meta_ctrl |= ((u32)ena_tx_ctx->req_id <<
+		ENA_ETH_IO_TX_DESC_REQ_ID_LO_SHIFT) &
+		ENA_ETH_IO_TX_DESC_REQ_ID_LO_MASK;
+
+	desc->meta_ctrl |= (ena_tx_ctx->df <<
+		ENA_ETH_IO_TX_DESC_DF_SHIFT) &
+		ENA_ETH_IO_TX_DESC_DF_MASK;
+
+	/* Bits 10-15 */
+	desc->len_ctrl |= ((ena_tx_ctx->req_id >> 10) <<
+		ENA_ETH_IO_TX_DESC_REQ_ID_HI_SHIFT) &
+		ENA_ETH_IO_TX_DESC_REQ_ID_HI_MASK;
+
+	if (ena_tx_ctx->meta_valid) {
+		desc->meta_ctrl |= (ena_tx_ctx->tso_enable <<
+			ENA_ETH_IO_TX_DESC_TSO_EN_SHIFT) &
+			ENA_ETH_IO_TX_DESC_TSO_EN_MASK;
+		desc->meta_ctrl |= ena_tx_ctx->l3_proto &
+			ENA_ETH_IO_TX_DESC_L3_PROTO_IDX_MASK;
+		desc->meta_ctrl |= (ena_tx_ctx->l4_proto <<
+			ENA_ETH_IO_TX_DESC_L4_PROTO_IDX_SHIFT) &
+			ENA_ETH_IO_TX_DESC_L4_PROTO_IDX_MASK;
+		desc->meta_ctrl |= (ena_tx_ctx->l3_csum_enable <<
+			ENA_ETH_IO_TX_DESC_L3_CSUM_EN_SHIFT) &
+			ENA_ETH_IO_TX_DESC_L3_CSUM_EN_MASK;
+		desc->meta_ctrl |= (ena_tx_ctx->l4_csum_enable <<
+			ENA_ETH_IO_TX_DESC_L4_CSUM_EN_SHIFT) &
+			ENA_ETH_IO_TX_DESC_L4_CSUM_EN_MASK;
+		desc->meta_ctrl |= (ena_tx_ctx->l4_csum_partial <<
+			ENA_ETH_IO_TX_DESC_L4_CSUM_PARTIAL_SHIFT) &
+			ENA_ETH_IO_TX_DESC_L4_CSUM_PARTIAL_MASK;
+	}
+
+	for (i = 0; i < num_bufs; i++) {
+		/* The first desc share the same desc as the header */
+		if (likely(i != 0)) {
+			rc = ena_com_sq_update_tail(io_sq);
+			if (unlikely(rc)) {
+				netdev_err(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+					   "Failed to update sq tail\n");
+				return rc;
+			}
+
+			desc = get_sq_desc(io_sq);
+			if (unlikely(!desc))
+				return -EFAULT;
+
+			memset(desc, 0x0, sizeof(struct ena_eth_io_tx_desc));
+
+			desc->len_ctrl |= ((u32)io_sq->phase <<
+				ENA_ETH_IO_TX_DESC_PHASE_SHIFT) &
+				ENA_ETH_IO_TX_DESC_PHASE_MASK;
+		}
+
+		desc->len_ctrl |= ena_bufs->len &
+			ENA_ETH_IO_TX_DESC_LENGTH_MASK;
+
+		addr_hi = ((ena_bufs->paddr &
+			GENMASK_ULL(io_sq->dma_addr_bits - 1, 32)) >> 32);
+
+		desc->buff_addr_lo = (u32)ena_bufs->paddr;
+		desc->buff_addr_hi_hdr_sz |= addr_hi &
+			ENA_ETH_IO_TX_DESC_ADDR_HI_MASK;
+		ena_bufs++;
+	}
+
+	/* set the last desc indicator */
+	desc->len_ctrl |= ENA_ETH_IO_TX_DESC_LAST_MASK;
+
+	rc = ena_com_sq_update_tail(io_sq);
+	if (unlikely(rc)) {
+		netdev_err(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+			   "Failed to update sq tail of the last descriptor\n");
+		return rc;
+	}
+
+	rc = ena_com_close_bounce_buffer(io_sq);
+
+	*nb_hw_desc = io_sq->tail - start_tail;
+	return rc;
+}
+
+int ena_com_rx_pkt(struct ena_com_io_cq *io_cq,
+		   struct ena_com_io_sq *io_sq,
+		   struct ena_com_rx_ctx *ena_rx_ctx)
+{
+	struct ena_com_rx_buf_info *ena_buf = &ena_rx_ctx->ena_bufs[0];
+	struct ena_eth_io_rx_cdesc_base *cdesc = NULL;
+	u16 q_depth = io_cq->q_depth;
+	u16 cdesc_idx = 0;
+	u16 nb_hw_desc;
+	u16 i = 0;
+	int rc;
+
+	WARN(io_cq->direction != ENA_COM_IO_QUEUE_DIRECTION_RX, "wrong Q type");
+
+	rc = ena_com_cdesc_rx_pkt_get(io_cq, &cdesc_idx, &nb_hw_desc);
+	if (unlikely(rc != 0))
+		return -EFAULT;
+
+	if (nb_hw_desc == 0) {
+		ena_rx_ctx->descs = nb_hw_desc;
+		return 0;
+	}
+
+	netdev_dbg(ena_com_io_cq_to_ena_dev(io_cq)->net_device,
+		   "Fetch rx packet: queue %d completed desc: %d\n", io_cq->qid, nb_hw_desc);
+
+	if (unlikely(nb_hw_desc > ena_rx_ctx->max_bufs)) {
+		netdev_err(ena_com_io_cq_to_ena_dev(io_cq)->net_device,
+			   "Too many RX cdescs (%d) > MAX(%d)\n", nb_hw_desc, ena_rx_ctx->max_bufs);
+		return -ENOSPC;
+	}
+
+	cdesc = ena_com_rx_cdesc_idx_to_ptr(io_cq, cdesc_idx);
+	ena_rx_ctx->pkt_offset = cdesc->offset;
+
+	do {
+		ena_buf[i].len = cdesc->length;
+		ena_buf[i].req_id = cdesc->req_id;
+		if (unlikely(ena_buf[i].req_id >= q_depth))
+			return -EIO;
+
+		if (++i >= nb_hw_desc)
+			break;
+
+		cdesc = ena_com_rx_cdesc_idx_to_ptr(io_cq, cdesc_idx + i);
+
+	} while (1);
+
+	/* Update SQ head ptr */
+	io_sq->next_to_comp += nb_hw_desc;
+
+	netdev_dbg(ena_com_io_cq_to_ena_dev(io_cq)->net_device,
+		   "[%s][QID#%d] Updating SQ head to: %d\n", __func__, io_sq->qid,
+		   io_sq->next_to_comp);
+
+	/* Get rx flags from the last pkt */
+	ena_com_rx_set_flags(io_cq, ena_rx_ctx, cdesc);
+
+	ena_rx_ctx->descs = nb_hw_desc;
+
+	return 0;
+}
+
+int ena_com_add_single_rx_desc(struct ena_com_io_sq *io_sq,
+			       struct ena_com_buf *ena_buf,
+			       u16 req_id)
+{
+	struct ena_eth_io_rx_desc *desc;
+
+	WARN(io_sq->direction != ENA_COM_IO_QUEUE_DIRECTION_RX, "wrong Q type");
+
+	if (unlikely(!ena_com_sq_have_enough_space(io_sq, 1)))
+		return -ENOSPC;
+
+	desc = get_sq_desc(io_sq);
+	if (unlikely(!desc))
+		return -EFAULT;
+
+	memset(desc, 0x0, sizeof(struct ena_eth_io_rx_desc));
+
+	desc->length = ena_buf->len;
+
+	desc->ctrl = ENA_ETH_IO_RX_DESC_FIRST_MASK |
+		     ENA_ETH_IO_RX_DESC_LAST_MASK |
+		     ENA_ETH_IO_RX_DESC_COMP_REQ_MASK |
+		     (io_sq->phase & ENA_ETH_IO_RX_DESC_PHASE_MASK);
+
+	desc->req_id = req_id;
+
+	netdev_dbg(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+		   "[%s] Adding single RX desc, Queue: %u, req_id: %u\n", __func__, io_sq->qid,
+		   req_id);
+
+	desc->buff_addr_lo = (u32)ena_buf->paddr;
+	desc->buff_addr_hi =
+		((ena_buf->paddr & GENMASK_ULL(io_sq->dma_addr_bits - 1, 32)) >> 32);
+
+	return ena_com_sq_update_tail(io_sq);
+}
+
+bool ena_com_cq_empty(struct ena_com_io_cq *io_cq)
+{
+	struct ena_eth_io_rx_cdesc_base *cdesc;
+
+	cdesc = ena_com_get_next_rx_cdesc(io_cq);
+	if (cdesc)
+		return false;
+	else
+		return true;
+}

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_eth_com.h

@@ -0,0 +1,236 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/*
+ * Copyright 2015-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+
+#ifndef ENA_ETH_COM_H_
+#define ENA_ETH_COM_H_
+
+#include "ena_com.h"
+
+/* we allow 2 DMA descriptors per LLQ entry */
+#define ENA_LLQ_ENTRY_DESC_CHUNK_SIZE	(2 * sizeof(struct ena_eth_io_tx_desc))
+#define ENA_LLQ_HEADER		(128UL - ENA_LLQ_ENTRY_DESC_CHUNK_SIZE)
+#define ENA_LLQ_LARGE_HEADER	(256UL - ENA_LLQ_ENTRY_DESC_CHUNK_SIZE)
+
+struct ena_com_tx_ctx {
+	struct ena_com_tx_meta ena_meta;
+	struct ena_com_buf *ena_bufs;
+	/* For LLQ, header buffer - pushed to the device mem space */
+	void *push_header;
+
+	enum ena_eth_io_l3_proto_index l3_proto;
+	enum ena_eth_io_l4_proto_index l4_proto;
+	u16 num_bufs;
+	u16 req_id;
+	/* For regular queue, indicate the size of the header
+	 * For LLQ, indicate the size of the pushed buffer
+	 */
+	u16 header_len;
+
+	u8 meta_valid;
+	u8 tso_enable;
+	u8 l3_csum_enable;
+	u8 l4_csum_enable;
+	u8 l4_csum_partial;
+	u8 df; /* Don't fragment */
+};
+
+struct ena_com_rx_ctx {
+	struct ena_com_rx_buf_info *ena_bufs;
+	enum ena_eth_io_l3_proto_index l3_proto;
+	enum ena_eth_io_l4_proto_index l4_proto;
+	bool l3_csum_err;
+	bool l4_csum_err;
+	u8 l4_csum_checked;
+	/* fragmented packet */
+	bool frag;
+	u32 hash;
+	u16 descs;
+	u16 max_bufs;
+	u8 pkt_offset;
+};
+
+int ena_com_prepare_tx(struct ena_com_io_sq *io_sq,
+		       struct ena_com_tx_ctx *ena_tx_ctx,
+		       int *nb_hw_desc);
+
+int ena_com_rx_pkt(struct ena_com_io_cq *io_cq,
+		   struct ena_com_io_sq *io_sq,
+		   struct ena_com_rx_ctx *ena_rx_ctx);
+
+int ena_com_add_single_rx_desc(struct ena_com_io_sq *io_sq,
+			       struct ena_com_buf *ena_buf,
+			       u16 req_id);
+
+bool ena_com_cq_empty(struct ena_com_io_cq *io_cq);
+
+static inline void ena_com_unmask_intr(struct ena_com_io_cq *io_cq,
+				       struct ena_eth_io_intr_reg *intr_reg)
+{
+	writel(intr_reg->intr_control, io_cq->unmask_reg);
+}
+
+static inline int ena_com_free_q_entries(struct ena_com_io_sq *io_sq)
+{
+	u16 tail, next_to_comp, cnt;
+
+	next_to_comp = io_sq->next_to_comp;
+	tail = io_sq->tail;
+	cnt = tail - next_to_comp;
+
+	return io_sq->q_depth - 1 - cnt;
+}
+
+/* Check if the submission queue has enough space to hold required_buffers */
+static inline bool ena_com_sq_have_enough_space(struct ena_com_io_sq *io_sq,
+						u16 required_buffers)
+{
+	int temp;
+
+	if (io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_HOST)
+		return ena_com_free_q_entries(io_sq) >= required_buffers;
+
+	/* This calculation doesn't need to be 100% accurate. So to reduce
+	 * the calculation overhead just Subtract 2 lines from the free descs
+	 * (one for the header line and one to compensate the devision
+	 * down calculation.
+	 */
+	temp = required_buffers / io_sq->llq_info.descs_per_entry + 2;
+
+	return ena_com_free_q_entries(io_sq) > temp;
+}
+
+static inline bool ena_com_meta_desc_changed(struct ena_com_io_sq *io_sq,
+					     struct ena_com_tx_ctx *ena_tx_ctx)
+{
+	if (!ena_tx_ctx->meta_valid)
+		return false;
+
+	return !!memcmp(&io_sq->cached_tx_meta,
+			&ena_tx_ctx->ena_meta,
+			sizeof(struct ena_com_tx_meta));
+}
+
+static inline bool is_llq_max_tx_burst_exists(struct ena_com_io_sq *io_sq)
+{
+	return (io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) &&
+	       io_sq->llq_info.max_entries_in_tx_burst > 0;
+}
+
+static inline bool ena_com_is_doorbell_needed(struct ena_com_io_sq *io_sq,
+					      struct ena_com_tx_ctx *ena_tx_ctx)
+{
+	struct ena_com_llq_info *llq_info;
+	int descs_after_first_entry;
+	int num_entries_needed = 1;
+	u16 num_descs;
+
+	if (!is_llq_max_tx_burst_exists(io_sq))
+		return false;
+
+	llq_info = &io_sq->llq_info;
+	num_descs = ena_tx_ctx->num_bufs;
+
+	if (llq_info->disable_meta_caching ||
+	    unlikely(ena_com_meta_desc_changed(io_sq, ena_tx_ctx)))
+		++num_descs;
+
+	if (num_descs > llq_info->descs_num_before_header) {
+		descs_after_first_entry = num_descs - llq_info->descs_num_before_header;
+		num_entries_needed += DIV_ROUND_UP(descs_after_first_entry,
+						   llq_info->descs_per_entry);
+	}
+
+	netdev_dbg(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+		   "Queue: %d num_descs: %d num_entries_needed: %d\n", io_sq->qid, num_descs,
+		   num_entries_needed);
+
+	return num_entries_needed > io_sq->entries_in_tx_burst_left;
+}
+
+static inline int ena_com_write_sq_doorbell(struct ena_com_io_sq *io_sq)
+{
+	u16 max_entries_in_tx_burst = io_sq->llq_info.max_entries_in_tx_burst;
+	u16 tail = io_sq->tail;
+
+	netdev_dbg(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+		   "Write submission queue doorbell for queue: %d tail: %d\n", io_sq->qid, tail);
+
+	writel(tail, io_sq->db_addr);
+
+	if (is_llq_max_tx_burst_exists(io_sq)) {
+		netdev_dbg(ena_com_io_sq_to_ena_dev(io_sq)->net_device,
+			   "Reset available entries in tx burst for queue %d to %d\n", io_sq->qid,
+			   max_entries_in_tx_burst);
+		io_sq->entries_in_tx_burst_left = max_entries_in_tx_burst;
+	}
+
+	return 0;
+}
+
+static inline void ena_com_update_numa_node(struct ena_com_io_cq *io_cq,
+					    u8 numa_node)
+{
+	struct ena_eth_io_numa_node_cfg_reg numa_cfg;
+
+	if (!io_cq->numa_node_cfg_reg)
+		return;
+
+	numa_cfg.numa_cfg = (numa_node & ENA_ETH_IO_NUMA_NODE_CFG_REG_NUMA_MASK)
+		| ENA_ETH_IO_NUMA_NODE_CFG_REG_ENABLED_MASK;
+
+	writel(numa_cfg.numa_cfg, io_cq->numa_node_cfg_reg);
+}
+
+static inline void ena_com_comp_ack(struct ena_com_io_sq *io_sq, u16 elem)
+{
+	io_sq->next_to_comp += elem;
+}
+
+static inline void ena_com_cq_inc_head(struct ena_com_io_cq *io_cq)
+{
+	io_cq->head++;
+
+	/* Switch phase bit in case of wrap around */
+	if (unlikely((io_cq->head & (io_cq->q_depth - 1)) == 0))
+		io_cq->phase ^= 1;
+}
+
+static inline int ena_com_tx_comp_req_id_get(struct ena_com_io_cq *io_cq,
+					     u16 *req_id)
+{
+	u8 expected_phase, cdesc_phase;
+	struct ena_eth_io_tx_cdesc *cdesc;
+	u16 masked_head;
+
+	masked_head = io_cq->head & (io_cq->q_depth - 1);
+	expected_phase = io_cq->phase;
+
+	cdesc = (struct ena_eth_io_tx_cdesc *)
+		((uintptr_t)io_cq->cdesc_addr.virt_addr +
+		(masked_head * io_cq->cdesc_entry_size_in_bytes));
+
+	/* When the current completion descriptor phase isn't the same as the
+	 * expected, it mean that the device still didn't update
+	 * this completion.
+	 */
+	cdesc_phase = READ_ONCE(cdesc->flags) & ENA_ETH_IO_TX_CDESC_PHASE_MASK;
+	if (cdesc_phase != expected_phase)
+		return -EAGAIN;
+
+	dma_rmb();
+
+	*req_id = READ_ONCE(cdesc->req_id);
+	if (unlikely(*req_id >= io_cq->q_depth)) {
+		netdev_err(ena_com_io_cq_to_ena_dev(io_cq)->net_device, "Invalid req id %d\n",
+			   cdesc->req_id);
+		return -EINVAL;
+	}
+
+	ena_com_cq_inc_head(io_cq);
+
+	return 0;
+}
+
+#endif /* ENA_ETH_COM_H_ */

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_eth_io_defs.h

@@ -0,0 +1,390 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/*
+ * Copyright 2015-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+#ifndef _ENA_ETH_IO_H_
+#define _ENA_ETH_IO_H_
+
+enum ena_eth_io_l3_proto_index {
+	ENA_ETH_IO_L3_PROTO_UNKNOWN                 = 0,
+	ENA_ETH_IO_L3_PROTO_IPV4                    = 8,
+	ENA_ETH_IO_L3_PROTO_IPV6                    = 11,
+	ENA_ETH_IO_L3_PROTO_FCOE                    = 21,
+	ENA_ETH_IO_L3_PROTO_ROCE                    = 22,
+};
+
+enum ena_eth_io_l4_proto_index {
+	ENA_ETH_IO_L4_PROTO_UNKNOWN                 = 0,
+	ENA_ETH_IO_L4_PROTO_TCP                     = 12,
+	ENA_ETH_IO_L4_PROTO_UDP                     = 13,
+	ENA_ETH_IO_L4_PROTO_ROUTEABLE_ROCE          = 23,
+};
+
+struct ena_eth_io_tx_desc {
+	/* 15:0 : length - Buffer length in bytes, must
+	 *    include any packet trailers that the ENA supposed
+	 *    to update like End-to-End CRC, Authentication GMAC
+	 *    etc. This length must not include the
+	 *    'Push_Buffer' length. This length must not include
+	 *    the 4-byte added in the end for 802.3 Ethernet FCS
+	 * 21:16 : req_id_hi - Request ID[15:10]
+	 * 22 : reserved22 - MBZ
+	 * 23 : meta_desc - MBZ
+	 * 24 : phase
+	 * 25 : reserved1 - MBZ
+	 * 26 : first - Indicates first descriptor in
+	 *    transaction
+	 * 27 : last - Indicates last descriptor in
+	 *    transaction
+	 * 28 : comp_req - Indicates whether completion
+	 *    should be posted, after packet is transmitted.
+	 *    Valid only for first descriptor
+	 * 30:29 : reserved29 - MBZ
+	 * 31 : reserved31 - MBZ
+	 */
+	u32 len_ctrl;
+
+	/* 3:0 : l3_proto_idx - L3 protocol. This field
+	 *    required when l3_csum_en,l3_csum or tso_en are set.
+	 * 4 : DF - IPv4 DF, must be 0 if packet is IPv4 and
+	 *    DF flags of the IPv4 header is 0. Otherwise must
+	 *    be set to 1
+	 * 6:5 : reserved5
+	 * 7 : tso_en - Enable TSO, For TCP only.
+	 * 12:8 : l4_proto_idx - L4 protocol. This field need
+	 *    to be set when l4_csum_en or tso_en are set.
+	 * 13 : l3_csum_en - enable IPv4 header checksum.
+	 * 14 : l4_csum_en - enable TCP/UDP checksum.
+	 * 15 : ethernet_fcs_dis - when set, the controller
+	 *    will not append the 802.3 Ethernet Frame Check
+	 *    Sequence to the packet
+	 * 16 : reserved16
+	 * 17 : l4_csum_partial - L4 partial checksum. when
+	 *    set to 0, the ENA calculates the L4 checksum,
+	 *    where the Destination Address required for the
+	 *    TCP/UDP pseudo-header is taken from the actual
+	 *    packet L3 header. when set to 1, the ENA doesn't
+	 *    calculate the sum of the pseudo-header, instead,
+	 *    the checksum field of the L4 is used instead. When
+	 *    TSO enabled, the checksum of the pseudo-header
+	 *    must not include the tcp length field. L4 partial
+	 *    checksum should be used for IPv6 packet that
+	 *    contains Routing Headers.
+	 * 20:18 : reserved18 - MBZ
+	 * 21 : reserved21 - MBZ
+	 * 31:22 : req_id_lo - Request ID[9:0]
+	 */
+	u32 meta_ctrl;
+
+	u32 buff_addr_lo;
+
+	/* address high and header size
+	 * 15:0 : addr_hi - Buffer Pointer[47:32]
+	 * 23:16 : reserved16_w2
+	 * 31:24 : header_length - Header length. For Low
+	 *    Latency Queues, this fields indicates the number
+	 *    of bytes written to the headers' memory. For
+	 *    normal queues, if packet is TCP or UDP, and longer
+	 *    than max_header_size, then this field should be
+	 *    set to the sum of L4 header offset and L4 header
+	 *    size(without options), otherwise, this field
+	 *    should be set to 0. For both modes, this field
+	 *    must not exceed the max_header_size.
+	 *    max_header_size value is reported by the Max
+	 *    Queues Feature descriptor
+	 */
+	u32 buff_addr_hi_hdr_sz;
+};
+
+struct ena_eth_io_tx_meta_desc {
+	/* 9:0 : req_id_lo - Request ID[9:0]
+	 * 11:10 : reserved10 - MBZ
+	 * 12 : reserved12 - MBZ
+	 * 13 : reserved13 - MBZ
+	 * 14 : ext_valid - if set, offset fields in Word2
+	 *    are valid Also MSS High in Word 0 and bits [31:24]
+	 *    in Word 3
+	 * 15 : reserved15
+	 * 19:16 : mss_hi
+	 * 20 : eth_meta_type - 0: Tx Metadata Descriptor, 1:
+	 *    Extended Metadata Descriptor
+	 * 21 : meta_store - Store extended metadata in queue
+	 *    cache
+	 * 22 : reserved22 - MBZ
+	 * 23 : meta_desc - MBO
+	 * 24 : phase
+	 * 25 : reserved25 - MBZ
+	 * 26 : first - Indicates first descriptor in
+	 *    transaction
+	 * 27 : last - Indicates last descriptor in
+	 *    transaction
+	 * 28 : comp_req - Indicates whether completion
+	 *    should be posted, after packet is transmitted.
+	 *    Valid only for first descriptor
+	 * 30:29 : reserved29 - MBZ
+	 * 31 : reserved31 - MBZ
+	 */
+	u32 len_ctrl;
+
+	/* 5:0 : req_id_hi
+	 * 31:6 : reserved6 - MBZ
+	 */
+	u32 word1;
+
+	/* 7:0 : l3_hdr_len
+	 * 15:8 : l3_hdr_off
+	 * 21:16 : l4_hdr_len_in_words - counts the L4 header
+	 *    length in words. there is an explicit assumption
+	 *    that L4 header appears right after L3 header and
+	 *    L4 offset is based on l3_hdr_off+l3_hdr_len
+	 * 31:22 : mss_lo
+	 */
+	u32 word2;
+
+	u32 reserved;
+};
+
+struct ena_eth_io_tx_cdesc {
+	/* Request ID[15:0] */
+	u16 req_id;
+
+	u8 status;
+
+	/* flags
+	 * 0 : phase
+	 * 7:1 : reserved1
+	 */
+	u8 flags;
+
+	u16 sub_qid;
+
+	u16 sq_head_idx;
+};
+
+struct ena_eth_io_rx_desc {
+	/* In bytes. 0 means 64KB */
+	u16 length;
+
+	/* MBZ */
+	u8 reserved2;
+
+	/* 0 : phase
+	 * 1 : reserved1 - MBZ
+	 * 2 : first - Indicates first descriptor in
+	 *    transaction
+	 * 3 : last - Indicates last descriptor in transaction
+	 * 4 : comp_req
+	 * 5 : reserved5 - MBO
+	 * 7:6 : reserved6 - MBZ
+	 */
+	u8 ctrl;
+
+	u16 req_id;
+
+	/* MBZ */
+	u16 reserved6;
+
+	u32 buff_addr_lo;
+
+	u16 buff_addr_hi;
+
+	/* MBZ */
+	u16 reserved16_w3;
+};
+
+/* 4-word format Note: all ethernet parsing information are valid only when
+ * last=1
+ */
+struct ena_eth_io_rx_cdesc_base {
+	/* 4:0 : l3_proto_idx
+	 * 6:5 : src_vlan_cnt
+	 * 7 : reserved7 - MBZ
+	 * 12:8 : l4_proto_idx
+	 * 13 : l3_csum_err - when set, either the L3
+	 *    checksum error detected, or, the controller didn't
+	 *    validate the checksum. This bit is valid only when
+	 *    l3_proto_idx indicates IPv4 packet
+	 * 14 : l4_csum_err - when set, either the L4
+	 *    checksum error detected, or, the controller didn't
+	 *    validate the checksum. This bit is valid only when
+	 *    l4_proto_idx indicates TCP/UDP packet, and,
+	 *    ipv4_frag is not set. This bit is valid only when
+	 *    l4_csum_checked below is set.
+	 * 15 : ipv4_frag - Indicates IPv4 fragmented packet
+	 * 16 : l4_csum_checked - L4 checksum was verified
+	 *    (could be OK or error), when cleared the status of
+	 *    checksum is unknown
+	 * 23:17 : reserved17 - MBZ
+	 * 24 : phase
+	 * 25 : l3_csum2 - second checksum engine result
+	 * 26 : first - Indicates first descriptor in
+	 *    transaction
+	 * 27 : last - Indicates last descriptor in
+	 *    transaction
+	 * 29:28 : reserved28
+	 * 30 : buffer - 0: Metadata descriptor. 1: Buffer
+	 *    Descriptor was used
+	 * 31 : reserved31
+	 */
+	u32 status;
+
+	u16 length;
+
+	u16 req_id;
+
+	/* 32-bit hash result */
+	u32 hash;
+
+	u16 sub_qid;
+
+	u8 offset;
+
+	u8 reserved;
+};
+
+/* 8-word format */
+struct ena_eth_io_rx_cdesc_ext {
+	struct ena_eth_io_rx_cdesc_base base;
+
+	u32 buff_addr_lo;
+
+	u16 buff_addr_hi;
+
+	u16 reserved16;
+
+	u32 reserved_w6;
+
+	u32 reserved_w7;
+};
+
+struct ena_eth_io_intr_reg {
+	/* 14:0 : rx_intr_delay
+	 * 29:15 : tx_intr_delay
+	 * 30 : intr_unmask
+	 * 31 : reserved
+	 */
+	u32 intr_control;
+};
+
+struct ena_eth_io_numa_node_cfg_reg {
+	/* 7:0 : numa
+	 * 30:8 : reserved
+	 * 31 : enabled
+	 */
+	u32 numa_cfg;
+};
+
+/* tx_desc */
+#define ENA_ETH_IO_TX_DESC_LENGTH_MASK                      GENMASK(15, 0)
+#define ENA_ETH_IO_TX_DESC_REQ_ID_HI_SHIFT                  16
+#define ENA_ETH_IO_TX_DESC_REQ_ID_HI_MASK                   GENMASK(21, 16)
+#define ENA_ETH_IO_TX_DESC_META_DESC_SHIFT                  23
+#define ENA_ETH_IO_TX_DESC_META_DESC_MASK                   BIT(23)
+#define ENA_ETH_IO_TX_DESC_PHASE_SHIFT                      24
+#define ENA_ETH_IO_TX_DESC_PHASE_MASK                       BIT(24)
+#define ENA_ETH_IO_TX_DESC_FIRST_SHIFT                      26
+#define ENA_ETH_IO_TX_DESC_FIRST_MASK                       BIT(26)
+#define ENA_ETH_IO_TX_DESC_LAST_SHIFT                       27
+#define ENA_ETH_IO_TX_DESC_LAST_MASK                        BIT(27)
+#define ENA_ETH_IO_TX_DESC_COMP_REQ_SHIFT                   28
+#define ENA_ETH_IO_TX_DESC_COMP_REQ_MASK                    BIT(28)
+#define ENA_ETH_IO_TX_DESC_L3_PROTO_IDX_MASK                GENMASK(3, 0)
+#define ENA_ETH_IO_TX_DESC_DF_SHIFT                         4
+#define ENA_ETH_IO_TX_DESC_DF_MASK                          BIT(4)
+#define ENA_ETH_IO_TX_DESC_TSO_EN_SHIFT                     7
+#define ENA_ETH_IO_TX_DESC_TSO_EN_MASK                      BIT(7)
+#define ENA_ETH_IO_TX_DESC_L4_PROTO_IDX_SHIFT               8
+#define ENA_ETH_IO_TX_DESC_L4_PROTO_IDX_MASK                GENMASK(12, 8)
+#define ENA_ETH_IO_TX_DESC_L3_CSUM_EN_SHIFT                 13
+#define ENA_ETH_IO_TX_DESC_L3_CSUM_EN_MASK                  BIT(13)
+#define ENA_ETH_IO_TX_DESC_L4_CSUM_EN_SHIFT                 14
+#define ENA_ETH_IO_TX_DESC_L4_CSUM_EN_MASK                  BIT(14)
+#define ENA_ETH_IO_TX_DESC_ETHERNET_FCS_DIS_SHIFT           15
+#define ENA_ETH_IO_TX_DESC_ETHERNET_FCS_DIS_MASK            BIT(15)
+#define ENA_ETH_IO_TX_DESC_L4_CSUM_PARTIAL_SHIFT            17
+#define ENA_ETH_IO_TX_DESC_L4_CSUM_PARTIAL_MASK             BIT(17)
+#define ENA_ETH_IO_TX_DESC_REQ_ID_LO_SHIFT                  22
+#define ENA_ETH_IO_TX_DESC_REQ_ID_LO_MASK                   GENMASK(31, 22)
+#define ENA_ETH_IO_TX_DESC_ADDR_HI_MASK                     GENMASK(15, 0)
+#define ENA_ETH_IO_TX_DESC_HEADER_LENGTH_SHIFT              24
+#define ENA_ETH_IO_TX_DESC_HEADER_LENGTH_MASK               GENMASK(31, 24)
+
+/* tx_meta_desc */
+#define ENA_ETH_IO_TX_META_DESC_REQ_ID_LO_MASK              GENMASK(9, 0)
+#define ENA_ETH_IO_TX_META_DESC_EXT_VALID_SHIFT             14
+#define ENA_ETH_IO_TX_META_DESC_EXT_VALID_MASK              BIT(14)
+#define ENA_ETH_IO_TX_META_DESC_MSS_HI_SHIFT                16
+#define ENA_ETH_IO_TX_META_DESC_MSS_HI_MASK                 GENMASK(19, 16)
+#define ENA_ETH_IO_TX_META_DESC_ETH_META_TYPE_SHIFT         20
+#define ENA_ETH_IO_TX_META_DESC_ETH_META_TYPE_MASK          BIT(20)
+#define ENA_ETH_IO_TX_META_DESC_META_STORE_SHIFT            21
+#define ENA_ETH_IO_TX_META_DESC_META_STORE_MASK             BIT(21)
+#define ENA_ETH_IO_TX_META_DESC_META_DESC_SHIFT             23
+#define ENA_ETH_IO_TX_META_DESC_META_DESC_MASK              BIT(23)
+#define ENA_ETH_IO_TX_META_DESC_PHASE_SHIFT                 24
+#define ENA_ETH_IO_TX_META_DESC_PHASE_MASK                  BIT(24)
+#define ENA_ETH_IO_TX_META_DESC_FIRST_SHIFT                 26
+#define ENA_ETH_IO_TX_META_DESC_FIRST_MASK                  BIT(26)
+#define ENA_ETH_IO_TX_META_DESC_LAST_SHIFT                  27
+#define ENA_ETH_IO_TX_META_DESC_LAST_MASK                   BIT(27)
+#define ENA_ETH_IO_TX_META_DESC_COMP_REQ_SHIFT              28
+#define ENA_ETH_IO_TX_META_DESC_COMP_REQ_MASK               BIT(28)
+#define ENA_ETH_IO_TX_META_DESC_REQ_ID_HI_MASK              GENMASK(5, 0)
+#define ENA_ETH_IO_TX_META_DESC_L3_HDR_LEN_MASK             GENMASK(7, 0)
+#define ENA_ETH_IO_TX_META_DESC_L3_HDR_OFF_SHIFT            8
+#define ENA_ETH_IO_TX_META_DESC_L3_HDR_OFF_MASK             GENMASK(15, 8)
+#define ENA_ETH_IO_TX_META_DESC_L4_HDR_LEN_IN_WORDS_SHIFT   16
+#define ENA_ETH_IO_TX_META_DESC_L4_HDR_LEN_IN_WORDS_MASK    GENMASK(21, 16)
+#define ENA_ETH_IO_TX_META_DESC_MSS_LO_SHIFT                22
+#define ENA_ETH_IO_TX_META_DESC_MSS_LO_MASK                 GENMASK(31, 22)
+
+/* tx_cdesc */
+#define ENA_ETH_IO_TX_CDESC_PHASE_MASK                      BIT(0)
+
+/* rx_desc */
+#define ENA_ETH_IO_RX_DESC_PHASE_MASK                       BIT(0)
+#define ENA_ETH_IO_RX_DESC_FIRST_SHIFT                      2
+#define ENA_ETH_IO_RX_DESC_FIRST_MASK                       BIT(2)
+#define ENA_ETH_IO_RX_DESC_LAST_SHIFT                       3
+#define ENA_ETH_IO_RX_DESC_LAST_MASK                        BIT(3)
+#define ENA_ETH_IO_RX_DESC_COMP_REQ_SHIFT                   4
+#define ENA_ETH_IO_RX_DESC_COMP_REQ_MASK                    BIT(4)
+
+/* rx_cdesc_base */
+#define ENA_ETH_IO_RX_CDESC_BASE_L3_PROTO_IDX_MASK          GENMASK(4, 0)
+#define ENA_ETH_IO_RX_CDESC_BASE_SRC_VLAN_CNT_SHIFT         5
+#define ENA_ETH_IO_RX_CDESC_BASE_SRC_VLAN_CNT_MASK          GENMASK(6, 5)
+#define ENA_ETH_IO_RX_CDESC_BASE_L4_PROTO_IDX_SHIFT         8
+#define ENA_ETH_IO_RX_CDESC_BASE_L4_PROTO_IDX_MASK          GENMASK(12, 8)
+#define ENA_ETH_IO_RX_CDESC_BASE_L3_CSUM_ERR_SHIFT          13
+#define ENA_ETH_IO_RX_CDESC_BASE_L3_CSUM_ERR_MASK           BIT(13)
+#define ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_ERR_SHIFT          14
+#define ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_ERR_MASK           BIT(14)
+#define ENA_ETH_IO_RX_CDESC_BASE_IPV4_FRAG_SHIFT            15
+#define ENA_ETH_IO_RX_CDESC_BASE_IPV4_FRAG_MASK             BIT(15)
+#define ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_CHECKED_SHIFT      16
+#define ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_CHECKED_MASK       BIT(16)
+#define ENA_ETH_IO_RX_CDESC_BASE_PHASE_SHIFT                24
+#define ENA_ETH_IO_RX_CDESC_BASE_PHASE_MASK                 BIT(24)
+#define ENA_ETH_IO_RX_CDESC_BASE_L3_CSUM2_SHIFT             25
+#define ENA_ETH_IO_RX_CDESC_BASE_L3_CSUM2_MASK              BIT(25)
+#define ENA_ETH_IO_RX_CDESC_BASE_FIRST_SHIFT                26
+#define ENA_ETH_IO_RX_CDESC_BASE_FIRST_MASK                 BIT(26)
+#define ENA_ETH_IO_RX_CDESC_BASE_LAST_SHIFT                 27
+#define ENA_ETH_IO_RX_CDESC_BASE_LAST_MASK                  BIT(27)
+#define ENA_ETH_IO_RX_CDESC_BASE_BUFFER_SHIFT               30
+#define ENA_ETH_IO_RX_CDESC_BASE_BUFFER_MASK                BIT(30)
+
+/* intr_reg */
+#define ENA_ETH_IO_INTR_REG_RX_INTR_DELAY_MASK              GENMASK(14, 0)
+#define ENA_ETH_IO_INTR_REG_TX_INTR_DELAY_SHIFT             15
+#define ENA_ETH_IO_INTR_REG_TX_INTR_DELAY_MASK              GENMASK(29, 15)
+#define ENA_ETH_IO_INTR_REG_INTR_UNMASK_SHIFT               30
+#define ENA_ETH_IO_INTR_REG_INTR_UNMASK_MASK                BIT(30)
+
+/* numa_node_cfg_reg */
+#define ENA_ETH_IO_NUMA_NODE_CFG_REG_NUMA_MASK              GENMASK(7, 0)
+#define ENA_ETH_IO_NUMA_NODE_CFG_REG_ENABLED_SHIFT          31
+#define ENA_ETH_IO_NUMA_NODE_CFG_REG_ENABLED_MASK           BIT(31)
+
+#endif /* _ENA_ETH_IO_H_ */

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_netdev.h

@@ -0,0 +1,469 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/*
+ * Copyright 2015-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+
+#ifndef ENA_H
+#define ENA_H
+
+#include <linux/bitops.h>
+#include <linux/dim.h>
+#include <linux/etherdevice.h>
+#include <linux/if_vlan.h>
+#include <linux/inetdevice.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/xdp.h>
+#include <uapi/linux/bpf.h>
+#include <net/devlink.h>
+
+#include "ena_com.h"
+#include "ena_eth_com.h"
+
+#define DRV_MODULE_GEN_MAJOR	2
+#define DRV_MODULE_GEN_MINOR	1
+#define DRV_MODULE_GEN_SUBMINOR 0
+
+#define DRV_MODULE_NAME		"ena"
+
+#define DEVICE_NAME	"Elastic Network Adapter (ENA)"
+
+/* 1 for AENQ + ADMIN */
+#define ENA_ADMIN_MSIX_VEC		1
+#define ENA_MAX_MSIX_VEC(io_queues)	(ENA_ADMIN_MSIX_VEC + (io_queues))
+
+/* The ENA buffer length fields is 16 bit long. So when PAGE_SIZE == 64kB the
+ * driver passes 0.
+ * Since the max packet size the ENA handles is ~9kB limit the buffer length to
+ * 16kB.
+ */
+#if PAGE_SIZE > SZ_16K
+#define ENA_PAGE_SIZE (_AC(SZ_16K, UL))
+#else
+#define ENA_PAGE_SIZE PAGE_SIZE
+#endif
+
+#define ENA_MIN_MSIX_VEC		2
+
+#define ENA_REG_BAR			0
+#define ENA_MEM_BAR			2
+#define ENA_BAR_MASK (BIT(ENA_REG_BAR) | BIT(ENA_MEM_BAR))
+
+#define ENA_DEFAULT_RING_SIZE	(1024)
+#define ENA_MIN_RING_SIZE	(256)
+
+#define ENA_MIN_RX_BUF_SIZE (2048)
+
+#define ENA_MIN_NUM_IO_QUEUES	(1)
+
+#define ENA_TX_WAKEUP_THRESH		(MAX_SKB_FRAGS + 2)
+#define ENA_DEFAULT_RX_COPYBREAK	(256 - NET_IP_ALIGN)
+
+#define ENA_MIN_MTU		128
+
+#define ENA_NAME_MAX_LEN	20
+#define ENA_IRQNAME_SIZE	40
+
+#define ENA_PKT_MAX_BUFS	19
+
+#define ENA_RX_RSS_TABLE_LOG_SIZE  7
+#define ENA_RX_RSS_TABLE_SIZE	(1 << ENA_RX_RSS_TABLE_LOG_SIZE)
+
+/* The number of tx packet completions that will be handled each NAPI poll
+ * cycle is ring_size / ENA_TX_POLL_BUDGET_DIVIDER.
+ */
+#define ENA_TX_POLL_BUDGET_DIVIDER	4
+
+/* Refill Rx queue when number of required descriptors is above
+ * QUEUE_SIZE / ENA_RX_REFILL_THRESH_DIVIDER or ENA_RX_REFILL_THRESH_PACKET
+ */
+#define ENA_RX_REFILL_THRESH_DIVIDER	8
+#define ENA_RX_REFILL_THRESH_PACKET	256
+
+/* Number of queues to check for missing queues per timer service */
+#define ENA_MONITORED_TX_QUEUES	4
+/* Max timeout packets before device reset */
+#define MAX_NUM_OF_TIMEOUTED_PACKETS 128
+
+#define ENA_TX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1))
+
+#define ENA_RX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1))
+#define ENA_RX_RING_IDX_ADD(idx, n, ring_size) \
+	(((idx) + (n)) & ((ring_size) - 1))
+
+#define ENA_IO_TXQ_IDX(q)	(2 * (q))
+#define ENA_IO_RXQ_IDX(q)	(2 * (q) + 1)
+#define ENA_IO_TXQ_IDX_TO_COMBINED_IDX(q)	((q) / 2)
+#define ENA_IO_RXQ_IDX_TO_COMBINED_IDX(q)	(((q) - 1) / 2)
+
+#define ENA_MGMNT_IRQ_IDX		0
+#define ENA_IO_IRQ_FIRST_IDX		1
+#define ENA_IO_IRQ_IDX(q)		(ENA_IO_IRQ_FIRST_IDX + (q))
+
+#define ENA_ADMIN_POLL_DELAY_US 100
+
+/* ENA device should send keep alive msg every 1 sec.
+ * We wait for 6 sec just to be on the safe side.
+ */
+#define ENA_DEVICE_KALIVE_TIMEOUT	(6 * HZ)
+#define ENA_MAX_NO_INTERRUPT_ITERATIONS 3
+
+#define ENA_MMIO_DISABLE_REG_READ	BIT(0)
+
+struct ena_phc_info;
+
+struct ena_irq {
+	irq_handler_t handler;
+	void *data;
+	int cpu;
+	u32 vector;
+	cpumask_t affinity_hint_mask;
+	char name[ENA_IRQNAME_SIZE];
+};
+
+struct ena_napi {
+	u8 first_interrupt ____cacheline_aligned;
+	u8 interrupts_masked;
+	struct napi_struct napi;
+	struct ena_ring *tx_ring;
+	struct ena_ring *rx_ring;
+	u32 qid;
+	struct dim dim;
+};
+
+struct ena_tx_buffer {
+	union {
+		struct sk_buff *skb;
+		/* XDP buffer structure which is used for sending packets in
+		 * the xdp queues
+		 */
+		struct xdp_frame *xdpf;
+	};
+	/* num of ena desc for this specific skb
+	 * (includes data desc and metadata desc)
+	 */
+	u32 tx_descs;
+	/* num of buffers used by this skb */
+	u32 num_of_bufs;
+
+	/* Total size of all buffers in bytes */
+	u32 total_tx_size;
+
+	/* Indicate if bufs[0] map the linear data of the skb. */
+	u8 map_linear_data;
+
+	/* Used for detect missing tx packets to limit the number of prints */
+	u8 print_once;
+	/* Save the last jiffies to detect missing tx packets
+	 *
+	 * sets to non zero value on ena_start_xmit and set to zero on
+	 * napi and timer_Service_routine.
+	 *
+	 * while this value is not protected by lock,
+	 * a given packet is not expected to be handled by ena_start_xmit
+	 * and by napi/timer_service at the same time.
+	 */
+	unsigned long last_jiffies;
+	struct ena_com_buf bufs[ENA_PKT_MAX_BUFS];
+} ____cacheline_aligned;
+
+struct ena_rx_buffer {
+	struct sk_buff *skb;
+	struct page *page;
+	dma_addr_t dma_addr;
+	u32 page_offset;
+	u32 buf_offset;
+	struct ena_com_buf ena_buf;
+} ____cacheline_aligned;
+
+struct ena_stats_tx {
+	u64 cnt;
+	u64 bytes;
+	u64 queue_stop;
+	u64 prepare_ctx_err;
+	u64 queue_wakeup;
+	u64 dma_mapping_err;
+	u64 linearize;
+	u64 linearize_failed;
+	u64 napi_comp;
+	u64 tx_poll;
+	u64 doorbells;
+	u64 bad_req_id;
+	u64 llq_buffer_copy;
+	u64 missed_tx;
+	u64 unmask_interrupt;
+	u64 last_napi_jiffies;
+};
+
+struct ena_stats_rx {
+	u64 cnt;
+	u64 bytes;
+	u64 rx_copybreak_pkt;
+	u64 csum_good;
+	u64 refil_partial;
+	u64 csum_bad;
+	u64 page_alloc_fail;
+	u64 skb_alloc_fail;
+	u64 dma_mapping_err;
+	u64 bad_desc_num;
+	u64 bad_req_id;
+	u64 empty_rx_ring;
+	u64 csum_unchecked;
+	u64 xdp_aborted;
+	u64 xdp_drop;
+	u64 xdp_pass;
+	u64 xdp_tx;
+	u64 xdp_invalid;
+	u64 xdp_redirect;
+};
+
+struct ena_ring {
+	/* Holds the empty requests for TX/RX
+	 * out of order completions
+	 */
+	u16 *free_ids;
+
+	union {
+		struct ena_tx_buffer *tx_buffer_info;
+		struct ena_rx_buffer *rx_buffer_info;
+	};
+
+	/* cache ptr to avoid using the adapter */
+	struct device *dev;
+	struct pci_dev *pdev;
+	struct napi_struct *napi;
+	struct net_device *netdev;
+	struct ena_com_dev *ena_dev;
+	struct ena_adapter *adapter;
+	struct ena_com_io_cq *ena_com_io_cq;
+	struct ena_com_io_sq *ena_com_io_sq;
+	struct bpf_prog *xdp_bpf_prog;
+	struct xdp_rxq_info xdp_rxq;
+	spinlock_t xdp_tx_lock;	/* synchronize XDP TX/Redirect traffic */
+	/* Used for rx queues only to point to the xdp tx ring, to
+	 * which traffic should be redirected from this rx ring.
+	 */
+	struct ena_ring *xdp_ring;
+
+	u16 next_to_use;
+	u16 next_to_clean;
+	u16 rx_copybreak;
+	u16 rx_headroom;
+	u16 qid;
+	u16 mtu;
+	u16 sgl_size;
+
+	/* The maximum header length the device can handle */
+	u8 tx_max_header_size;
+
+	bool disable_meta_caching;
+	u16 no_interrupt_event_cnt;
+
+	/* cpu and NUMA for TPH */
+	int cpu;
+	int numa_node;
+
+	/* number of tx/rx_buffer_info's entries */
+	int ring_size;
+
+	enum ena_admin_placement_policy_type tx_mem_queue_type;
+
+	struct ena_com_rx_buf_info ena_bufs[ENA_PKT_MAX_BUFS];
+	u32  smoothed_interval;
+	u32  per_napi_packets;
+	u16 non_empty_napi_events;
+	struct u64_stats_sync syncp;
+	union {
+		struct ena_stats_tx tx_stats;
+		struct ena_stats_rx rx_stats;
+	};
+
+	u8 *push_buf_intermediate_buf;
+	int empty_rx_queue;
+} ____cacheline_aligned;
+
+struct ena_stats_dev {
+	u64 tx_timeout;
+	u64 suspend;
+	u64 resume;
+	u64 wd_expired;
+	u64 interface_up;
+	u64 interface_down;
+	u64 admin_q_pause;
+	u64 rx_drops;
+	u64 tx_drops;
+	u64 reset_fail;
+};
+
+enum ena_flags_t {
+	ENA_FLAG_DEVICE_RUNNING,
+	ENA_FLAG_DEV_UP,
+	ENA_FLAG_LINK_UP,
+	ENA_FLAG_MSIX_ENABLED,
+	ENA_FLAG_TRIGGER_RESET,
+	ENA_FLAG_ONGOING_RESET
+};
+
+/* adapter specific private data structure */
+struct ena_adapter {
+	struct ena_com_dev *ena_dev;
+	/* OS defined structs */
+	struct net_device *netdev;
+	struct pci_dev *pdev;
+
+	/* rx packets that shorter that this len will be copied to the skb
+	 * header
+	 */
+	u32 rx_copybreak;
+	u32 max_mtu;
+
+	u32 num_io_queues;
+	u32 max_num_io_queues;
+
+	int msix_vecs;
+
+	u32 missing_tx_completion_threshold;
+
+	u32 requested_tx_ring_size;
+	u32 requested_rx_ring_size;
+
+	u32 max_tx_ring_size;
+	u32 max_rx_ring_size;
+
+	u32 msg_enable;
+
+	/* large_llq_header_enabled is used for two purposes:
+	 * 1. Indicates that large LLQ has been requested.
+	 * 2. Indicates whether large LLQ is set or not after device
+	 *    initialization / configuration.
+	 */
+	bool large_llq_header_enabled;
+	bool large_llq_header_supported;
+
+	u16 max_tx_sgl_size;
+	u16 max_rx_sgl_size;
+
+	u8 mac_addr[ETH_ALEN];
+
+	unsigned long keep_alive_timeout;
+	unsigned long missing_tx_completion_to;
+
+	char name[ENA_NAME_MAX_LEN];
+
+	struct ena_phc_info *phc_info;
+
+	unsigned long flags;
+	/* TX */
+	struct ena_ring tx_ring[ENA_MAX_NUM_IO_QUEUES]
+		____cacheline_aligned_in_smp;
+
+	/* RX */
+	struct ena_ring rx_ring[ENA_MAX_NUM_IO_QUEUES]
+		____cacheline_aligned_in_smp;
+
+	struct ena_napi ena_napi[ENA_MAX_NUM_IO_QUEUES];
+
+	struct ena_irq irq_tbl[ENA_MAX_MSIX_VEC(ENA_MAX_NUM_IO_QUEUES)];
+
+	/* timer service */
+	struct work_struct reset_task;
+	struct timer_list timer_service;
+
+	bool wd_state;
+	bool dev_up_before_reset;
+	bool disable_meta_caching;
+	unsigned long last_keep_alive_jiffies;
+
+	struct u64_stats_sync syncp;
+	struct ena_stats_dev dev_stats;
+	struct ena_admin_eni_stats eni_stats;
+	struct ena_admin_ena_srd_info ena_srd_info;
+
+	/* last queue index that was checked for uncompleted tx packets */
+	u32 last_monitored_tx_qid;
+
+	enum ena_regs_reset_reason_types reset_reason;
+
+	struct bpf_prog *xdp_bpf_prog;
+	u32 xdp_first_ring;
+	u32 xdp_num_queues;
+
+	struct devlink *devlink;
+	struct devlink_port devlink_port;
+#ifdef CONFIG_DEBUG_FS
+
+	struct dentry *debugfs_base;
+#endif /* CONFIG_DEBUG_FS */
+};
+
+void ena_set_ethtool_ops(struct net_device *netdev);
+
+void ena_dump_stats_to_dmesg(struct ena_adapter *adapter);
+
+void ena_dump_stats_to_buf(struct ena_adapter *adapter, u8 *buf);
+
+
+int ena_update_queue_params(struct ena_adapter *adapter,
+			    u32 new_tx_size,
+			    u32 new_rx_size,
+			    u32 new_llq_header_len);
+
+int ena_update_queue_count(struct ena_adapter *adapter, u32 new_channel_count);
+
+int ena_set_rx_copybreak(struct ena_adapter *adapter, u32 rx_copybreak);
+
+int ena_get_sset_count(struct net_device *netdev, int sset);
+
+static inline void ena_reset_device(struct ena_adapter *adapter,
+				    enum ena_regs_reset_reason_types reset_reason)
+{
+	adapter->reset_reason = reset_reason;
+	/* Make sure reset reason is set before triggering the reset */
+	smp_mb__before_atomic();
+	set_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
+}
+
+int ena_destroy_device(struct ena_adapter *adapter, bool graceful);
+int ena_restore_device(struct ena_adapter *adapter);
+int handle_invalid_req_id(struct ena_ring *ring, u16 req_id,
+			  struct ena_tx_buffer *tx_info, bool is_xdp);
+
+/* Increase a stat by cnt while holding syncp seqlock on 32bit machines */
+static inline void ena_increase_stat(u64 *statp, u64 cnt,
+				     struct u64_stats_sync *syncp)
+{
+	u64_stats_update_begin(syncp);
+	(*statp) += cnt;
+	u64_stats_update_end(syncp);
+}
+
+static inline void ena_ring_tx_doorbell(struct ena_ring *tx_ring)
+{
+	ena_com_write_sq_doorbell(tx_ring->ena_com_io_sq);
+	ena_increase_stat(&tx_ring->tx_stats.doorbells, 1, &tx_ring->syncp);
+}
+
+int ena_xmit_common(struct ena_adapter *adapter,
+		    struct ena_ring *ring,
+		    struct ena_tx_buffer *tx_info,
+		    struct ena_com_tx_ctx *ena_tx_ctx,
+		    u16 next_to_use,
+		    u32 bytes);
+void ena_unmap_tx_buff(struct ena_ring *tx_ring,
+		       struct ena_tx_buffer *tx_info);
+void ena_init_io_rings(struct ena_adapter *adapter,
+		       int first_index, int count);
+int ena_create_io_tx_queues_in_range(struct ena_adapter *adapter,
+				     int first_index, int count);
+int ena_setup_tx_resources_in_range(struct ena_adapter *adapter,
+				    int first_index, int count);
+void ena_free_all_io_tx_resources_in_range(struct ena_adapter *adapter,
+					   int first_index, int count);
+void ena_free_all_io_tx_resources(struct ena_adapter *adapter);
+void ena_down(struct ena_adapter *adapter);
+int ena_up(struct ena_adapter *adapter);
+void ena_unmask_interrupt(struct ena_ring *tx_ring, struct ena_ring *rx_ring);
+void ena_update_ring_numa_node(struct ena_ring *tx_ring,
+			       struct ena_ring *rx_ring);
+#endif /* !(ENA_H) */

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_pci_id_tbl.h

@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/*
+ * Copyright 2015-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+
+#ifndef ENA_PCI_ID_TBL_H_
+#define ENA_PCI_ID_TBL_H_
+
+#ifndef PCI_VENDOR_ID_AMAZON
+#define PCI_VENDOR_ID_AMAZON 0x1d0f
+#endif
+
+#ifndef PCI_DEV_ID_ENA_PF
+#define PCI_DEV_ID_ENA_PF	0x0ec2
+#endif
+
+#ifndef PCI_DEV_ID_ENA_LLQ_PF
+#define PCI_DEV_ID_ENA_LLQ_PF	0x1ec2
+#endif
+
+#ifndef PCI_DEV_ID_ENA_VF
+#define PCI_DEV_ID_ENA_VF	0xec20
+#endif
+
+#ifndef PCI_DEV_ID_ENA_LLQ_VF
+#define PCI_DEV_ID_ENA_LLQ_VF	0xec21
+#endif
+
+#ifndef PCI_DEV_ID_ENA_RESRV0
+#define PCI_DEV_ID_ENA_RESRV0	0x0051
+#endif
+
+#define ENA_PCI_ID_TABLE_ENTRY(devid) \
+	{PCI_DEVICE(PCI_VENDOR_ID_AMAZON, devid)},
+
+static const struct pci_device_id ena_pci_tbl[] = {
+	ENA_PCI_ID_TABLE_ENTRY(PCI_DEV_ID_ENA_RESRV0)
+	ENA_PCI_ID_TABLE_ENTRY(PCI_DEV_ID_ENA_PF)
+	ENA_PCI_ID_TABLE_ENTRY(PCI_DEV_ID_ENA_LLQ_PF)
+	ENA_PCI_ID_TABLE_ENTRY(PCI_DEV_ID_ENA_VF)
+	ENA_PCI_ID_TABLE_ENTRY(PCI_DEV_ID_ENA_LLQ_VF)
+	{ }
+};
+
+#endif /* ENA_PCI_ID_TBL_H_ */

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_phc.c

@@ -0,0 +1,236 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/*
+ * Copyright 2015-2022 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+
+#include <linux/pci.h>
+#include "ena_netdev.h"
+#include "ena_phc.h"
+#include "ena_devlink.h"
+
+static int ena_phc_adjtime(struct ptp_clock_info *clock_info, s64 delta)
+{
+	return -EOPNOTSUPP;
+}
+
+static int ena_phc_adjfine(struct ptp_clock_info *clock_info, long scaled_ppm)
+{
+	return -EOPNOTSUPP;
+}
+
+static int ena_phc_feature_enable(struct ptp_clock_info *clock_info,
+				  struct ptp_clock_request *rq,
+				  int on)
+{
+	return -EOPNOTSUPP;
+}
+
+static int ena_phc_gettimex64(struct ptp_clock_info *clock_info,
+			      struct timespec64 *ts,
+			      struct ptp_system_timestamp *sts)
+{
+	struct ena_phc_info *phc_info =
+		container_of(clock_info, struct ena_phc_info, clock_info);
+	unsigned long flags;
+	u64 timestamp_nsec;
+	int rc;
+
+	spin_lock_irqsave(&phc_info->lock, flags);
+
+	ptp_read_system_prets(sts);
+
+	rc = ena_com_phc_get_timestamp(phc_info->adapter->ena_dev,
+				       &timestamp_nsec);
+
+	ptp_read_system_postts(sts);
+
+	spin_unlock_irqrestore(&phc_info->lock, flags);
+
+	if (rc)
+		return rc;
+
+	*ts = ns_to_timespec64(timestamp_nsec);
+
+	return 0;
+}
+
+static int ena_phc_settime64(struct ptp_clock_info *clock_info,
+			     const struct timespec64 *ts)
+{
+	return -EOPNOTSUPP;
+}
+
+static struct ptp_clock_info ena_ptp_clock_info = {
+	.owner		= THIS_MODULE,
+	.n_alarm	= 0,
+	.n_ext_ts	= 0,
+	.n_per_out	= 0,
+	.pps		= 0,
+	.adjtime	= ena_phc_adjtime,
+	.adjfine	= ena_phc_adjfine,
+	.gettimex64	= ena_phc_gettimex64,
+	.settime64	= ena_phc_settime64,
+	.enable		= ena_phc_feature_enable,
+};
+
+/* Enable/Disable PHC by the kernel, affects on the next init flow */
+void ena_phc_enable(struct ena_adapter *adapter, bool enable)
+{
+	struct ena_phc_info *phc_info = adapter->phc_info;
+
+	if (!phc_info) {
+		netdev_err(adapter->netdev, "phc_info is not allocated\n");
+		return;
+	}
+
+	phc_info->enabled = enable;
+}
+
+/* Check if PHC is enabled by the kernel */
+bool ena_phc_is_enabled(struct ena_adapter *adapter)
+{
+	struct ena_phc_info *phc_info = adapter->phc_info;
+
+	return (phc_info && phc_info->enabled);
+}
+
+/* PHC is activated if ptp clock is registered in the kernel */
+bool ena_phc_is_active(struct ena_adapter *adapter)
+{
+	struct ena_phc_info *phc_info = adapter->phc_info;
+
+	return (phc_info && phc_info->clock);
+}
+
+static int ena_phc_register(struct ena_adapter *adapter)
+{
+	struct pci_dev *pdev = adapter->pdev;
+	struct ptp_clock_info *clock_info;
+	struct ena_phc_info *phc_info;
+	int rc = 0;
+
+	phc_info = adapter->phc_info;
+	clock_info = &phc_info->clock_info;
+
+	/* PHC may already be registered in case of a reset */
+	if (ena_phc_is_active(adapter))
+		return 0;
+
+	phc_info->adapter = adapter;
+
+	spin_lock_init(&phc_info->lock);
+
+	/* Fill the ptp_clock_info struct and register PTP clock */
+	*clock_info = ena_ptp_clock_info;
+	snprintf(clock_info->name,
+		 sizeof(clock_info->name),
+		 "ena-ptp-%02x",
+		 PCI_SLOT(pdev->devfn));
+
+	phc_info->clock = ptp_clock_register(clock_info, &pdev->dev);
+	if (IS_ERR(phc_info->clock)) {
+		rc = PTR_ERR(phc_info->clock);
+		netdev_err(adapter->netdev, "Failed registering ptp clock, error: %d\n",
+			   rc);
+		phc_info->clock = NULL;
+	}
+
+	return rc;
+}
+
+static void ena_phc_unregister(struct ena_adapter *adapter)
+{
+	struct ena_phc_info *phc_info = adapter->phc_info;
+
+	/* During reset flow, PHC must stay registered
+	 * to keep kernel's PHC index
+	 */
+	if (ena_phc_is_active(adapter) &&
+	    !test_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags)) {
+		ptp_clock_unregister(phc_info->clock);
+		phc_info->clock = NULL;
+	}
+}
+
+int ena_phc_alloc(struct ena_adapter *adapter)
+{
+	/* Allocate driver specific PHC info */
+	adapter->phc_info = vzalloc(sizeof(*adapter->phc_info));
+	if (unlikely(!adapter->phc_info)) {
+		netdev_err(adapter->netdev, "Failed to alloc phc_info\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+void ena_phc_free(struct ena_adapter *adapter)
+{
+	if (adapter->phc_info) {
+		vfree(adapter->phc_info);
+		adapter->phc_info = NULL;
+	}
+}
+
+int ena_phc_init(struct ena_adapter *adapter)
+{
+	struct ena_com_dev *ena_dev = adapter->ena_dev;
+	struct net_device *netdev = adapter->netdev;
+	int rc = -EOPNOTSUPP;
+
+	/* Validate PHC feature is supported in the device */
+	if (!ena_com_phc_supported(ena_dev)) {
+		netdev_dbg(netdev, "PHC feature is not supported by the device\n");
+		goto err_ena_com_phc_init;
+	}
+
+	/* Validate PHC feature is enabled by the kernel */
+	if (!ena_phc_is_enabled(adapter)) {
+		netdev_dbg(netdev, "PHC feature is not enabled by the kernel\n");
+		goto err_ena_com_phc_init;
+	}
+
+	/* Initialize device specific PHC info */
+	rc = ena_com_phc_init(ena_dev);
+	if (unlikely(rc)) {
+		netdev_err(netdev, "Failed to init phc, error: %d\n", rc);
+		goto err_ena_com_phc_init;
+	}
+
+	/* Configure PHC feature in driver and device */
+	rc = ena_com_phc_config(ena_dev);
+	if (unlikely(rc)) {
+		netdev_err(netdev, "Failed to config phc, error: %d\n", rc);
+		goto err_ena_com_phc_config;
+	}
+
+	/* Register to PTP class driver */
+	rc = ena_phc_register(adapter);
+	if (unlikely(rc)) {
+		netdev_err(netdev, "Failed to register phc, error: %d\n", rc);
+		goto err_ena_com_phc_config;
+	}
+
+	return 0;
+
+err_ena_com_phc_config:
+	ena_com_phc_destroy(ena_dev);
+err_ena_com_phc_init:
+	ena_phc_enable(adapter, false);
+	ena_devlink_disable_phc_param(adapter->devlink);
+	return rc;
+}
+
+void ena_phc_destroy(struct ena_adapter *adapter)
+{
+	ena_phc_unregister(adapter);
+	ena_com_phc_destroy(adapter->ena_dev);
+}
+
+int ena_phc_get_index(struct ena_adapter *adapter)
+{
+	if (ena_phc_is_active(adapter))
+		return ptp_clock_index(adapter->phc_info->clock);
+
+	return -1;
+}

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_phc.h

@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/*
+ * Copyright 2015-2022 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+
+#ifndef ENA_PHC_H
+#define ENA_PHC_H
+
+#include <linux/ptp_clock_kernel.h>
+
+struct ena_phc_info {
+	/* PTP hardware capabilities */
+	struct ptp_clock_info clock_info;
+
+	/* Registered PTP clock device */
+	struct ptp_clock *clock;
+
+	/* Adapter specific private data structure */
+	struct ena_adapter *adapter;
+
+	/* PHC lock */
+	spinlock_t lock;
+
+	/* Enabled by kernel */
+	bool enabled;
+};
+
+void ena_phc_enable(struct ena_adapter *adapter, bool enable);
+bool ena_phc_is_enabled(struct ena_adapter *adapter);
+bool ena_phc_is_active(struct ena_adapter *adapter);
+int ena_phc_get_index(struct ena_adapter *adapter);
+int ena_phc_init(struct ena_adapter *adapter);
+void ena_phc_destroy(struct ena_adapter *adapter);
+int ena_phc_alloc(struct ena_adapter *adapter);
+void ena_phc_free(struct ena_adapter *adapter);
+
+#endif /* ENA_PHC_H */

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_regs_defs.h

@@ -0,0 +1,140 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/*
+ * Copyright 2015-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+#ifndef _ENA_REGS_H_
+#define _ENA_REGS_H_
+
+enum ena_regs_reset_reason_types {
+	ENA_REGS_RESET_NORMAL                       = 0,
+	ENA_REGS_RESET_KEEP_ALIVE_TO                = 1,
+	ENA_REGS_RESET_ADMIN_TO                     = 2,
+	ENA_REGS_RESET_MISS_TX_CMPL                 = 3,
+	ENA_REGS_RESET_INV_RX_REQ_ID                = 4,
+	ENA_REGS_RESET_INV_TX_REQ_ID                = 5,
+	ENA_REGS_RESET_TOO_MANY_RX_DESCS            = 6,
+	ENA_REGS_RESET_INIT_ERR                     = 7,
+	ENA_REGS_RESET_DRIVER_INVALID_STATE         = 8,
+	ENA_REGS_RESET_OS_TRIGGER                   = 9,
+	ENA_REGS_RESET_OS_NETDEV_WD                 = 10,
+	ENA_REGS_RESET_SHUTDOWN                     = 11,
+	ENA_REGS_RESET_USER_TRIGGER                 = 12,
+	ENA_REGS_RESET_GENERIC                      = 13,
+	ENA_REGS_RESET_MISS_INTERRUPT               = 14,
+	ENA_REGS_RESET_SUSPECTED_POLL_STARVATION    = 15,
+	ENA_REGS_RESET_RX_DESCRIPTOR_MALFORMED	    = 16,
+};
+
+/* ena_registers offsets */
+
+/* 0 base */
+#define ENA_REGS_VERSION_OFF                                0x0
+#define ENA_REGS_CONTROLLER_VERSION_OFF                     0x4
+#define ENA_REGS_CAPS_OFF                                   0x8
+#define ENA_REGS_CAPS_EXT_OFF                               0xc
+#define ENA_REGS_AQ_BASE_LO_OFF                             0x10
+#define ENA_REGS_AQ_BASE_HI_OFF                             0x14
+#define ENA_REGS_AQ_CAPS_OFF                                0x18
+#define ENA_REGS_ACQ_BASE_LO_OFF                            0x20
+#define ENA_REGS_ACQ_BASE_HI_OFF                            0x24
+#define ENA_REGS_ACQ_CAPS_OFF                               0x28
+#define ENA_REGS_AQ_DB_OFF                                  0x2c
+#define ENA_REGS_ACQ_TAIL_OFF                               0x30
+#define ENA_REGS_AENQ_CAPS_OFF                              0x34
+#define ENA_REGS_AENQ_BASE_LO_OFF                           0x38
+#define ENA_REGS_AENQ_BASE_HI_OFF                           0x3c
+#define ENA_REGS_AENQ_HEAD_DB_OFF                           0x40
+#define ENA_REGS_AENQ_TAIL_OFF                              0x44
+#define ENA_REGS_INTR_MASK_OFF                              0x4c
+#define ENA_REGS_DEV_CTL_OFF                                0x54
+#define ENA_REGS_DEV_STS_OFF                                0x58
+#define ENA_REGS_MMIO_REG_READ_OFF                          0x5c
+#define ENA_REGS_MMIO_RESP_LO_OFF                           0x60
+#define ENA_REGS_MMIO_RESP_HI_OFF                           0x64
+#define ENA_REGS_RSS_IND_ENTRY_UPDATE_OFF                   0x68
+
+/* phc_registers offsets */
+
+/* 100 base */
+#define ENA_REGS_PHC_DB_OFF                                 0x100
+
+/* version register */
+#define ENA_REGS_VERSION_MINOR_VERSION_MASK                 0xff
+#define ENA_REGS_VERSION_MAJOR_VERSION_SHIFT                8
+#define ENA_REGS_VERSION_MAJOR_VERSION_MASK                 0xff00
+
+/* controller_version register */
+#define ENA_REGS_CONTROLLER_VERSION_SUBMINOR_VERSION_MASK   0xff
+#define ENA_REGS_CONTROLLER_VERSION_MINOR_VERSION_SHIFT     8
+#define ENA_REGS_CONTROLLER_VERSION_MINOR_VERSION_MASK      0xff00
+#define ENA_REGS_CONTROLLER_VERSION_MAJOR_VERSION_SHIFT     16
+#define ENA_REGS_CONTROLLER_VERSION_MAJOR_VERSION_MASK      0xff0000
+#define ENA_REGS_CONTROLLER_VERSION_IMPL_ID_SHIFT           24
+#define ENA_REGS_CONTROLLER_VERSION_IMPL_ID_MASK            0xff000000
+
+/* caps register */
+#define ENA_REGS_CAPS_CONTIGUOUS_QUEUE_REQUIRED_MASK        0x1
+#define ENA_REGS_CAPS_RESET_TIMEOUT_SHIFT                   1
+#define ENA_REGS_CAPS_RESET_TIMEOUT_MASK                    0x3e
+#define ENA_REGS_CAPS_DMA_ADDR_WIDTH_SHIFT                  8
+#define ENA_REGS_CAPS_DMA_ADDR_WIDTH_MASK                   0xff00
+#define ENA_REGS_CAPS_ADMIN_CMD_TO_SHIFT                    16
+#define ENA_REGS_CAPS_ADMIN_CMD_TO_MASK                     0xf0000
+
+/* aq_caps register */
+#define ENA_REGS_AQ_CAPS_AQ_DEPTH_MASK                      0xffff
+#define ENA_REGS_AQ_CAPS_AQ_ENTRY_SIZE_SHIFT                16
+#define ENA_REGS_AQ_CAPS_AQ_ENTRY_SIZE_MASK                 0xffff0000
+
+/* acq_caps register */
+#define ENA_REGS_ACQ_CAPS_ACQ_DEPTH_MASK                    0xffff
+#define ENA_REGS_ACQ_CAPS_ACQ_ENTRY_SIZE_SHIFT              16
+#define ENA_REGS_ACQ_CAPS_ACQ_ENTRY_SIZE_MASK               0xffff0000
+
+/* aenq_caps register */
+#define ENA_REGS_AENQ_CAPS_AENQ_DEPTH_MASK                  0xffff
+#define ENA_REGS_AENQ_CAPS_AENQ_ENTRY_SIZE_SHIFT            16
+#define ENA_REGS_AENQ_CAPS_AENQ_ENTRY_SIZE_MASK             0xffff0000
+
+/* dev_ctl register */
+#define ENA_REGS_DEV_CTL_DEV_RESET_MASK                     0x1
+#define ENA_REGS_DEV_CTL_AQ_RESTART_SHIFT                   1
+#define ENA_REGS_DEV_CTL_AQ_RESTART_MASK                    0x2
+#define ENA_REGS_DEV_CTL_QUIESCENT_SHIFT                    2
+#define ENA_REGS_DEV_CTL_QUIESCENT_MASK                     0x4
+#define ENA_REGS_DEV_CTL_IO_RESUME_SHIFT                    3
+#define ENA_REGS_DEV_CTL_IO_RESUME_MASK                     0x8
+#define ENA_REGS_DEV_CTL_RESET_REASON_SHIFT                 28
+#define ENA_REGS_DEV_CTL_RESET_REASON_MASK                  0xf0000000
+
+/* dev_sts register */
+#define ENA_REGS_DEV_STS_READY_MASK                         0x1
+#define ENA_REGS_DEV_STS_AQ_RESTART_IN_PROGRESS_SHIFT       1
+#define ENA_REGS_DEV_STS_AQ_RESTART_IN_PROGRESS_MASK        0x2
+#define ENA_REGS_DEV_STS_AQ_RESTART_FINISHED_SHIFT          2
+#define ENA_REGS_DEV_STS_AQ_RESTART_FINISHED_MASK           0x4
+#define ENA_REGS_DEV_STS_RESET_IN_PROGRESS_SHIFT            3
+#define ENA_REGS_DEV_STS_RESET_IN_PROGRESS_MASK             0x8
+#define ENA_REGS_DEV_STS_RESET_FINISHED_SHIFT               4
+#define ENA_REGS_DEV_STS_RESET_FINISHED_MASK                0x10
+#define ENA_REGS_DEV_STS_FATAL_ERROR_SHIFT                  5
+#define ENA_REGS_DEV_STS_FATAL_ERROR_MASK                   0x20
+#define ENA_REGS_DEV_STS_QUIESCENT_STATE_IN_PROGRESS_SHIFT  6
+#define ENA_REGS_DEV_STS_QUIESCENT_STATE_IN_PROGRESS_MASK   0x40
+#define ENA_REGS_DEV_STS_QUIESCENT_STATE_ACHIEVED_SHIFT     7
+#define ENA_REGS_DEV_STS_QUIESCENT_STATE_ACHIEVED_MASK      0x80
+
+/* mmio_reg_read register */
+#define ENA_REGS_MMIO_REG_READ_REQ_ID_MASK                  0xffff
+#define ENA_REGS_MMIO_REG_READ_REG_OFF_SHIFT                16
+#define ENA_REGS_MMIO_REG_READ_REG_OFF_MASK                 0xffff0000
+
+/* rss_ind_entry_update register */
+#define ENA_REGS_RSS_IND_ENTRY_UPDATE_INDEX_MASK            0xffff
+#define ENA_REGS_RSS_IND_ENTRY_UPDATE_CQ_IDX_SHIFT          16
+#define ENA_REGS_RSS_IND_ENTRY_UPDATE_CQ_IDX_MASK           0xffff0000
+
+/* phc_db_req_id register */
+#define ENA_REGS_PHC_DB_REQ_ID_MASK                         0xffff
+
+#endif /* _ENA_REGS_H_ */

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_xdp.c

@@ -0,0 +1,469 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/*
+ * Copyright 2015-2021 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+
+#include "ena_xdp.h"
+
+static int validate_xdp_req_id(struct ena_ring *tx_ring, u16 req_id)
+{
+	struct ena_tx_buffer *tx_info;
+
+	tx_info = &tx_ring->tx_buffer_info[req_id];
+	if (likely(tx_info->xdpf))
+		return 0;
+
+	return handle_invalid_req_id(tx_ring, req_id, tx_info, true);
+}
+
+static int ena_xdp_tx_map_frame(struct ena_ring *tx_ring,
+				struct ena_tx_buffer *tx_info,
+				struct xdp_frame *xdpf,
+				struct ena_com_tx_ctx *ena_tx_ctx)
+{
+	struct ena_adapter *adapter = tx_ring->adapter;
+	struct ena_com_buf *ena_buf;
+	int push_len = 0;
+	dma_addr_t dma;
+	void *data;
+	u32 size;
+
+	tx_info->xdpf = xdpf;
+	data = tx_info->xdpf->data;
+	size = tx_info->xdpf->len;
+
+	if (tx_ring->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) {
+		/* Designate part of the packet for LLQ */
+		push_len = min_t(u32, size, tx_ring->tx_max_header_size);
+
+		ena_tx_ctx->push_header = data;
+
+		size -= push_len;
+		data += push_len;
+	}
+
+	ena_tx_ctx->header_len = push_len;
+
+	if (size > 0) {
+		dma = dma_map_single(tx_ring->dev,
+				     data,
+				     size,
+				     DMA_TO_DEVICE);
+		if (unlikely(dma_mapping_error(tx_ring->dev, dma)))
+			goto error_report_dma_error;
+
+		tx_info->map_linear_data = 0;
+
+		ena_buf = tx_info->bufs;
+		ena_buf->paddr = dma;
+		ena_buf->len = size;
+
+		ena_tx_ctx->ena_bufs = ena_buf;
+		ena_tx_ctx->num_bufs = tx_info->num_of_bufs = 1;
+	}
+
+	return 0;
+
+error_report_dma_error:
+	ena_increase_stat(&tx_ring->tx_stats.dma_mapping_err, 1,
+			  &tx_ring->syncp);
+	netif_warn(adapter, tx_queued, adapter->netdev, "Failed to map xdp buff\n");
+
+	return -EINVAL;
+}
+
+int ena_xdp_xmit_frame(struct ena_ring *tx_ring,
+		       struct ena_adapter *adapter,
+		       struct xdp_frame *xdpf,
+		       int flags)
+{
+	struct ena_com_tx_ctx ena_tx_ctx = {};
+	struct ena_tx_buffer *tx_info;
+	u16 next_to_use, req_id;
+	int rc;
+
+	next_to_use = tx_ring->next_to_use;
+	req_id = tx_ring->free_ids[next_to_use];
+	tx_info = &tx_ring->tx_buffer_info[req_id];
+	tx_info->num_of_bufs = 0;
+
+	rc = ena_xdp_tx_map_frame(tx_ring, tx_info, xdpf, &ena_tx_ctx);
+	if (unlikely(rc))
+		goto err;
+
+	ena_tx_ctx.req_id = req_id;
+
+	rc = ena_xmit_common(adapter,
+			     tx_ring,
+			     tx_info,
+			     &ena_tx_ctx,
+			     next_to_use,
+			     xdpf->len);
+	if (rc)
+		goto error_unmap_dma;
+
+	/* trigger the dma engine. ena_ring_tx_doorbell()
+	 * calls a memory barrier inside it.
+	 */
+	if (flags & XDP_XMIT_FLUSH)
+		ena_ring_tx_doorbell(tx_ring);
+
+	return rc;
+
+error_unmap_dma:
+	ena_unmap_tx_buff(tx_ring, tx_info);
+err:
+	tx_info->xdpf = NULL;
+
+	return rc;
+}
+
+int ena_xdp_xmit(struct net_device *dev, int n,
+		 struct xdp_frame **frames, u32 flags)
+{
+	struct ena_adapter *adapter = netdev_priv(dev);
+	struct ena_ring *tx_ring;
+	int qid, i, nxmit = 0;
+
+	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
+		return -EINVAL;
+
+	if (!test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
+		return -ENETDOWN;
+
+	/* We assume that all rings have the same XDP program */
+	if (!READ_ONCE(adapter->rx_ring->xdp_bpf_prog))
+		return -ENXIO;
+
+	qid = smp_processor_id() % adapter->xdp_num_queues;
+	qid += adapter->xdp_first_ring;
+	tx_ring = &adapter->tx_ring[qid];
+
+	/* Other CPU ids might try to send thorugh this queue */
+	spin_lock(&tx_ring->xdp_tx_lock);
+
+	for (i = 0; i < n; i++) {
+		if (ena_xdp_xmit_frame(tx_ring, adapter, frames[i], 0))
+			break;
+		nxmit++;
+	}
+
+	/* Ring doorbell to make device aware of the packets */
+	if (flags & XDP_XMIT_FLUSH)
+		ena_ring_tx_doorbell(tx_ring);
+
+	spin_unlock(&tx_ring->xdp_tx_lock);
+
+	/* Return number of packets sent */
+	return nxmit;
+}
+
+static void ena_init_all_xdp_queues(struct ena_adapter *adapter)
+{
+	adapter->xdp_first_ring = adapter->num_io_queues;
+	adapter->xdp_num_queues = adapter->num_io_queues;
+
+	ena_init_io_rings(adapter,
+			  adapter->xdp_first_ring,
+			  adapter->xdp_num_queues);
+}
+
+int ena_setup_and_create_all_xdp_queues(struct ena_adapter *adapter)
+{
+	u32 xdp_first_ring = adapter->xdp_first_ring;
+	u32 xdp_num_queues = adapter->xdp_num_queues;
+	int rc = 0;
+
+	rc = ena_setup_tx_resources_in_range(adapter, xdp_first_ring, xdp_num_queues);
+	if (rc)
+		goto setup_err;
+
+	rc = ena_create_io_tx_queues_in_range(adapter, xdp_first_ring, xdp_num_queues);
+	if (rc)
+		goto create_err;
+
+	return 0;
+
+create_err:
+	ena_free_all_io_tx_resources_in_range(adapter, xdp_first_ring, xdp_num_queues);
+setup_err:
+	return rc;
+}
+
+/* Provides a way for both kernel and bpf-prog to know
+ * more about the RX-queue a given XDP frame arrived on.
+ */
+int ena_xdp_register_rxq_info(struct ena_ring *rx_ring)
+{
+	int rc;
+
+	rc = xdp_rxq_info_reg(&rx_ring->xdp_rxq, rx_ring->netdev, rx_ring->qid, 0);
+
+	netif_dbg(rx_ring->adapter, ifup, rx_ring->netdev, "Registering RX info for queue %d",
+		  rx_ring->qid);
+	if (rc) {
+		netif_err(rx_ring->adapter, ifup, rx_ring->netdev,
+			  "Failed to register xdp rx queue info. RX queue num %d rc: %d\n",
+			  rx_ring->qid, rc);
+		goto err;
+	}
+
+	rc = xdp_rxq_info_reg_mem_model(&rx_ring->xdp_rxq, MEM_TYPE_PAGE_SHARED, NULL);
+
+	if (rc) {
+		netif_err(rx_ring->adapter, ifup, rx_ring->netdev,
+			  "Failed to register xdp rx queue info memory model. RX queue num %d rc: %d\n",
+			  rx_ring->qid, rc);
+		xdp_rxq_info_unreg(&rx_ring->xdp_rxq);
+	}
+
+err:
+	return rc;
+}
+
+void ena_xdp_unregister_rxq_info(struct ena_ring *rx_ring)
+{
+	netif_dbg(rx_ring->adapter, ifdown, rx_ring->netdev,
+		  "Unregistering RX info for queue %d",
+		  rx_ring->qid);
+	xdp_rxq_info_unreg_mem_model(&rx_ring->xdp_rxq);
+	xdp_rxq_info_unreg(&rx_ring->xdp_rxq);
+}
+
+void ena_xdp_exchange_program_rx_in_range(struct ena_adapter *adapter,
+					  struct bpf_prog *prog,
+					  int first, int count)
+{
+	struct bpf_prog *old_bpf_prog;
+	struct ena_ring *rx_ring;
+	int i = 0;
+
+	for (i = first; i < count; i++) {
+		rx_ring = &adapter->rx_ring[i];
+		old_bpf_prog = xchg(&rx_ring->xdp_bpf_prog, prog);
+
+		if (!old_bpf_prog && prog) {
+			rx_ring->rx_headroom = XDP_PACKET_HEADROOM;
+		} else if (old_bpf_prog && !prog) {
+			rx_ring->rx_headroom = NET_SKB_PAD;
+		}
+	}
+}
+
+static void ena_xdp_exchange_program(struct ena_adapter *adapter,
+				     struct bpf_prog *prog)
+{
+	struct bpf_prog *old_bpf_prog = xchg(&adapter->xdp_bpf_prog, prog);
+
+	ena_xdp_exchange_program_rx_in_range(adapter,
+					     prog,
+					     0,
+					     adapter->num_io_queues);
+
+	if (old_bpf_prog)
+		bpf_prog_put(old_bpf_prog);
+}
+
+static int ena_destroy_and_free_all_xdp_queues(struct ena_adapter *adapter)
+{
+	bool was_up;
+	int rc;
+
+	was_up = test_bit(ENA_FLAG_DEV_UP, &adapter->flags);
+
+	if (was_up)
+		ena_down(adapter);
+
+	adapter->xdp_first_ring = 0;
+	adapter->xdp_num_queues = 0;
+	ena_xdp_exchange_program(adapter, NULL);
+	if (was_up) {
+		rc = ena_up(adapter);
+		if (rc)
+			return rc;
+	}
+	return 0;
+}
+
+static int ena_xdp_set(struct net_device *netdev, struct netdev_bpf *bpf)
+{
+	struct ena_adapter *adapter = netdev_priv(netdev);
+	struct bpf_prog *prog = bpf->prog;
+	struct bpf_prog *old_bpf_prog;
+	int rc, prev_mtu;
+	bool is_up;
+
+	is_up = test_bit(ENA_FLAG_DEV_UP, &adapter->flags);
+	rc = ena_xdp_allowed(adapter);
+	if (rc == ENA_XDP_ALLOWED) {
+		old_bpf_prog = adapter->xdp_bpf_prog;
+		if (prog) {
+			if (!is_up) {
+				ena_init_all_xdp_queues(adapter);
+			} else if (!old_bpf_prog) {
+				ena_down(adapter);
+				ena_init_all_xdp_queues(adapter);
+			}
+			ena_xdp_exchange_program(adapter, prog);
+
+			netif_dbg(adapter, drv, adapter->netdev, "Set a new XDP program\n");
+
+			if (is_up && !old_bpf_prog) {
+				rc = ena_up(adapter);
+				if (rc)
+					return rc;
+			}
+			xdp_features_set_redirect_target(netdev, false);
+		} else if (old_bpf_prog) {
+			xdp_features_clear_redirect_target(netdev);
+			netif_dbg(adapter, drv, adapter->netdev, "Removing XDP program\n");
+
+			rc = ena_destroy_and_free_all_xdp_queues(adapter);
+			if (rc)
+				return rc;
+		}
+
+		prev_mtu = netdev->max_mtu;
+		netdev->max_mtu = prog ? ENA_XDP_MAX_MTU : adapter->max_mtu;
+
+		if (!old_bpf_prog)
+			netif_info(adapter, drv, adapter->netdev,
+				   "XDP program is set, changing the max_mtu from %d to %d",
+				   prev_mtu, netdev->max_mtu);
+
+	} else if (rc == ENA_XDP_CURRENT_MTU_TOO_LARGE) {
+		netif_err(adapter, drv, adapter->netdev,
+			  "Failed to set xdp program, the current MTU (%d) is larger than the maximum allowed MTU (%lu) while xdp is on",
+			  netdev->mtu, ENA_XDP_MAX_MTU);
+		NL_SET_ERR_MSG_MOD(bpf->extack,
+				   "Failed to set xdp program, the current MTU is larger than the maximum allowed MTU. Check the dmesg for more info");
+		return -EINVAL;
+	} else if (rc == ENA_XDP_NO_ENOUGH_QUEUES) {
+		netif_err(adapter, drv, adapter->netdev,
+			  "Failed to set xdp program, the Rx/Tx channel count should be at most half of the maximum allowed channel count. The current queue count (%d), the maximal queue count (%d)\n",
+			  adapter->num_io_queues, adapter->max_num_io_queues);
+		NL_SET_ERR_MSG_MOD(bpf->extack,
+				   "Failed to set xdp program, there is no enough space for allocating XDP queues, Check the dmesg for more info");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* This is the main xdp callback, it's used by the kernel to set/unset the xdp
+ * program as well as to query the current xdp program id.
+ */
+int ena_xdp(struct net_device *netdev, struct netdev_bpf *bpf)
+{
+	switch (bpf->command) {
+	case XDP_SETUP_PROG:
+		return ena_xdp_set(netdev, bpf);
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int ena_clean_xdp_irq(struct ena_ring *tx_ring, u32 budget)
+{
+	u32 total_done = 0;
+	u16 next_to_clean;
+	int tx_pkts = 0;
+	u16 req_id;
+	int rc;
+
+	if (unlikely(!tx_ring))
+		return 0;
+	next_to_clean = tx_ring->next_to_clean;
+
+	while (tx_pkts < budget) {
+		struct ena_tx_buffer *tx_info;
+		struct xdp_frame *xdpf;
+
+		rc = ena_com_tx_comp_req_id_get(tx_ring->ena_com_io_cq,
+						&req_id);
+		if (rc) {
+			if (unlikely(rc == -EINVAL))
+				handle_invalid_req_id(tx_ring, req_id, NULL, true);
+			break;
+		}
+
+		/* validate that the request id points to a valid xdp_frame */
+		rc = validate_xdp_req_id(tx_ring, req_id);
+		if (rc)
+			break;
+
+		tx_info = &tx_ring->tx_buffer_info[req_id];
+
+		tx_info->last_jiffies = 0;
+
+		xdpf = tx_info->xdpf;
+		tx_info->xdpf = NULL;
+		ena_unmap_tx_buff(tx_ring, tx_info);
+		xdp_return_frame(xdpf);
+
+		tx_pkts++;
+		total_done += tx_info->tx_descs;
+		tx_ring->free_ids[next_to_clean] = req_id;
+		next_to_clean = ENA_TX_RING_IDX_NEXT(next_to_clean,
+						     tx_ring->ring_size);
+
+		netif_dbg(tx_ring->adapter, tx_done, tx_ring->netdev,
+			  "tx_poll: q %d pkt #%d req_id %d\n", tx_ring->qid, tx_pkts, req_id);
+	}
+
+	tx_ring->next_to_clean = next_to_clean;
+	ena_com_comp_ack(tx_ring->ena_com_io_sq, total_done);
+
+	netif_dbg(tx_ring->adapter, tx_done, tx_ring->netdev,
+		  "tx_poll: q %d done. total pkts: %d\n",
+		  tx_ring->qid, tx_pkts);
+
+	return tx_pkts;
+}
+
+/* This is the XDP napi callback. XDP queues use a separate napi callback
+ * than Rx/Tx queues.
+ */
+int ena_xdp_io_poll(struct napi_struct *napi, int budget)
+{
+	struct ena_napi *ena_napi = container_of(napi, struct ena_napi, napi);
+	struct ena_ring *tx_ring;
+	u32 work_done;
+	int ret;
+
+	tx_ring = ena_napi->tx_ring;
+
+	if (!test_bit(ENA_FLAG_DEV_UP, &tx_ring->adapter->flags) ||
+	    test_bit(ENA_FLAG_TRIGGER_RESET, &tx_ring->adapter->flags)) {
+		napi_complete_done(napi, 0);
+		return 0;
+	}
+
+	work_done = ena_clean_xdp_irq(tx_ring, budget);
+
+	/* If the device is about to reset or down, avoid unmask
+	 * the interrupt and return 0 so NAPI won't reschedule
+	 */
+	if (unlikely(!test_bit(ENA_FLAG_DEV_UP, &tx_ring->adapter->flags))) {
+		napi_complete_done(napi, 0);
+		ret = 0;
+	} else if (budget > work_done) {
+		ena_increase_stat(&tx_ring->tx_stats.napi_comp, 1,
+				  &tx_ring->syncp);
+		if (napi_complete_done(napi, work_done))
+			ena_unmask_interrupt(tx_ring, NULL);
+
+		ena_update_ring_numa_node(tx_ring, NULL);
+		ret = work_done;
+	} else {
+		ret = budget;
+	}
+
+	u64_stats_update_begin(&tx_ring->syncp);
+	tx_ring->tx_stats.tx_poll++;
+	u64_stats_update_end(&tx_ring->syncp);
+	tx_ring->tx_stats.last_napi_jiffies = jiffies;
+
+	return ret;
+}

linux-7.2.3/drivers/net/ethernet/amazon/ena/ena_xdp.h

@@ -0,0 +1,151 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/*
+ * Copyright 2015-2021 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+
+#ifndef ENA_XDP_H
+#define ENA_XDP_H
+
+#include "ena_netdev.h"
+#include <linux/bpf_trace.h>
+
+/* The max MTU size is configured to be the ethernet frame size without
+ * the overhead of the ethernet header, which can have a VLAN header, and
+ * a frame check sequence (FCS).
+ * The buffer size we share with the device is defined to be ENA_PAGE_SIZE
+ */
+#define ENA_XDP_MAX_MTU (ENA_PAGE_SIZE - ETH_HLEN - ETH_FCS_LEN -	\
+			 VLAN_HLEN - XDP_PACKET_HEADROOM -		\
+			 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
+
+#define ENA_IS_XDP_INDEX(adapter, index) (((index) >= (adapter)->xdp_first_ring) && \
+	((index) < (adapter)->xdp_first_ring + (adapter)->xdp_num_queues))
+
+enum ENA_XDP_ACTIONS {
+	ENA_XDP_PASS		= 0,
+	ENA_XDP_TX		= BIT(0),
+	ENA_XDP_REDIRECT	= BIT(1),
+	ENA_XDP_DROP		= BIT(2)
+};
+
+#define ENA_XDP_FORWARDED (ENA_XDP_TX | ENA_XDP_REDIRECT)
+
+int ena_setup_and_create_all_xdp_queues(struct ena_adapter *adapter);
+void ena_xdp_exchange_program_rx_in_range(struct ena_adapter *adapter,
+					  struct bpf_prog *prog,
+					  int first, int count);
+int ena_xdp_io_poll(struct napi_struct *napi, int budget);
+int ena_xdp_xmit_frame(struct ena_ring *tx_ring,
+		       struct ena_adapter *adapter,
+		       struct xdp_frame *xdpf,
+		       int flags);
+int ena_xdp_xmit(struct net_device *dev, int n,
+		 struct xdp_frame **frames, u32 flags);
+int ena_xdp(struct net_device *netdev, struct netdev_bpf *bpf);
+int ena_xdp_register_rxq_info(struct ena_ring *rx_ring);
+void ena_xdp_unregister_rxq_info(struct ena_ring *rx_ring);
+
+enum ena_xdp_errors_t {
+	ENA_XDP_ALLOWED = 0,
+	ENA_XDP_CURRENT_MTU_TOO_LARGE,
+	ENA_XDP_NO_ENOUGH_QUEUES,
+};
+
+static inline bool ena_xdp_present(struct ena_adapter *adapter)
+{
+	return !!adapter->xdp_bpf_prog;
+}
+
+static inline bool ena_xdp_present_ring(struct ena_ring *ring)
+{
+	return !!ring->xdp_bpf_prog;
+}
+
+static inline bool ena_xdp_legal_queue_count(struct ena_adapter *adapter,
+					     u32 queues)
+{
+	return 2 * queues <= adapter->max_num_io_queues;
+}
+
+static inline enum ena_xdp_errors_t ena_xdp_allowed(struct ena_adapter *adapter)
+{
+	enum ena_xdp_errors_t rc = ENA_XDP_ALLOWED;
+
+	if (adapter->netdev->mtu > ENA_XDP_MAX_MTU)
+		rc = ENA_XDP_CURRENT_MTU_TOO_LARGE;
+	else if (!ena_xdp_legal_queue_count(adapter, adapter->num_io_queues))
+		rc = ENA_XDP_NO_ENOUGH_QUEUES;
+
+	return rc;
+}
+
+static inline int ena_xdp_execute(struct ena_ring *rx_ring, struct xdp_buff *xdp)
+{
+	u32 verdict = ENA_XDP_PASS;
+	struct bpf_prog *xdp_prog;
+	struct ena_ring *xdp_ring;
+	struct xdp_frame *xdpf;
+	u64 *xdp_stat;
+
+	xdp_prog = READ_ONCE(rx_ring->xdp_bpf_prog);
+
+	verdict = bpf_prog_run_xdp(xdp_prog, xdp);
+
+	switch (verdict) {
+	case XDP_TX:
+		xdpf = xdp_convert_buff_to_frame(xdp);
+		if (unlikely(!xdpf)) {
+			trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict);
+			xdp_stat = &rx_ring->rx_stats.xdp_aborted;
+			verdict = ENA_XDP_DROP;
+			break;
+		}
+
+		/* Find xmit queue */
+		xdp_ring = rx_ring->xdp_ring;
+
+		/* The XDP queues are shared between XDP_TX and XDP_REDIRECT */
+		spin_lock(&xdp_ring->xdp_tx_lock);
+
+		if (ena_xdp_xmit_frame(xdp_ring, rx_ring->adapter, xdpf,
+				       XDP_XMIT_FLUSH))
+			xdp_return_frame(xdpf);
+
+		spin_unlock(&xdp_ring->xdp_tx_lock);
+		xdp_stat = &rx_ring->rx_stats.xdp_tx;
+		verdict = ENA_XDP_TX;
+		break;
+	case XDP_REDIRECT:
+		if (likely(!xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog))) {
+			xdp_stat = &rx_ring->rx_stats.xdp_redirect;
+			verdict = ENA_XDP_REDIRECT;
+			break;
+		}
+		trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict);
+		xdp_stat = &rx_ring->rx_stats.xdp_aborted;
+		verdict = ENA_XDP_DROP;
+		break;
+	case XDP_ABORTED:
+		trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict);
+		xdp_stat = &rx_ring->rx_stats.xdp_aborted;
+		verdict = ENA_XDP_DROP;
+		break;
+	case XDP_DROP:
+		xdp_stat = &rx_ring->rx_stats.xdp_drop;
+		verdict = ENA_XDP_DROP;
+		break;
+	case XDP_PASS:
+		xdp_stat = &rx_ring->rx_stats.xdp_pass;
+		verdict = ENA_XDP_PASS;
+		break;
+	default:
+		bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, verdict);
+		xdp_stat = &rx_ring->rx_stats.xdp_invalid;
+		verdict = ENA_XDP_DROP;
+	}
+
+	ena_increase_stat(xdp_stat, 1, &rx_ring->syncp);
+
+	return verdict;
+}
+#endif /* ENA_XDP_H */