Message-Id: <20241218105049.2237645-13-tianx@yunsilicon.com>
Date: Wed, 18 Dec 2024 18:50:50 +0800
From: "Xin Tian" <tianx@...silicon.com>
To: <netdev@...r.kernel.org>
Cc: <andrew+netdev@...n.ch>, <kuba@...nel.org>, <pabeni@...hat.com>, 
	<edumazet@...gle.com>, <davem@...emloft.net>, 
	<jeff.johnson@....qualcomm.com>, <przemyslaw.kitszel@...el.com>, 
	<weihg@...silicon.com>, <wanry@...silicon.com>
Subject: [PATCH v1 12/16] net-next/yunsilicon: Add ndo_start_xmit

Add ndo_start_xmit

 
Co-developed-by: Honggang Wei <weihg@...silicon.com>
Co-developed-by: Lei Yan <Jacky@...silicon.com>
Signed-off-by: Xin Tian <tianx@...silicon.com>
---
 .../net/ethernet/yunsilicon/xsc/net/Makefile  |   2 +-
 .../net/ethernet/yunsilicon/xsc/net/main.c    |   1 +
 .../net/ethernet/yunsilicon/xsc/net/xsc_eth.h |   1 +
 .../yunsilicon/xsc/net/xsc_eth_common.h       |   8 +
 .../ethernet/yunsilicon/xsc/net/xsc_eth_rx.c  |   1 -
 .../ethernet/yunsilicon/xsc/net/xsc_eth_tx.c  | 305 ++++++++++++++++++
 .../yunsilicon/xsc/net/xsc_eth_txrx.h         |  36 +++
 .../ethernet/yunsilicon/xsc/net/xsc_queue.h   |   7 +
 8 files changed, 359 insertions(+), 2 deletions(-)
 create mode 100644 drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_tx.c

diff --git a/drivers/net/ethernet/yunsilicon/xsc/net/Makefile b/drivers/net/ethernet/yunsilicon/xsc/net/Makefile
index 104ef5330..7cfc2aaa2 100644
--- a/drivers/net/ethernet/yunsilicon/xsc/net/Makefile
+++ b/drivers/net/ethernet/yunsilicon/xsc/net/Makefile
@@ -6,4 +6,4 @@ ccflags-y += -I$(srctree)/drivers/net/ethernet/yunsilicon/xsc
 
 obj-$(CONFIG_YUNSILICON_XSC_ETH) += xsc_eth.o
 
-xsc_eth-y := main.o xsc_eth_wq.o xsc_eth_txrx.o xsc_eth_rx.o
+xsc_eth-y := main.o xsc_eth_wq.o xsc_eth_txrx.o xsc_eth_tx.o xsc_eth_rx.o
diff --git a/drivers/net/ethernet/yunsilicon/xsc/net/main.c b/drivers/net/ethernet/yunsilicon/xsc/net/main.c
index dd2f99537..338e308a6 100644
--- a/drivers/net/ethernet/yunsilicon/xsc/net/main.c
+++ b/drivers/net/ethernet/yunsilicon/xsc/net/main.c
@@ -1662,6 +1662,7 @@ static int xsc_eth_set_hw_mtu(struct xsc_core_device *xdev, u16 mtu, u16 rx_buf_
 static const struct net_device_ops xsc_netdev_ops = {
 	.ndo_open		= xsc_eth_open,
 	.ndo_stop		= xsc_eth_close,
+	.ndo_start_xmit		= xsc_eth_xmit_start,
 };
 
 static void xsc_eth_build_nic_netdev(struct xsc_adapter *adapter)
diff --git a/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth.h b/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth.h
index 326f99520..3e5614eb1 100644
--- a/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth.h
+++ b/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth.h
@@ -6,6 +6,7 @@
 #ifndef XSC_ETH_H
 #define XSC_ETH_H
 
+#include <linux/udp.h>
 #include "common/xsc_device.h"
 #include "xsc_eth_common.h"
 
diff --git a/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_common.h b/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_common.h
index d35791a31..8b8398cfb 100644
--- a/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_common.h
+++ b/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_common.h
@@ -200,4 +200,12 @@ struct xsc_eth_channels {
 	u32 rqn_base;
 };
 
+union xsc_send_doorbell {
+	struct{
+		s32  next_pid : 16;
+		u32 qp_num : 15;
+	};
+	u32 send_data;
+};
+
 #endif
diff --git a/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_rx.c b/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_rx.c
index 73af472cf..286e5f9eb 100644
--- a/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_rx.c
+++ b/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_rx.c
@@ -40,4 +40,3 @@ int xsc_poll_rx_cq(struct xsc_cq *cq, int budget)
 	// TBD
 	return 0;
 }
-
diff --git a/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_tx.c b/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_tx.c
new file mode 100644
index 000000000..67e68485e
--- /dev/null
+++ b/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_tx.c
@@ -0,0 +1,305 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2021-2025, Shanghai Yunsilicon Technology Co., Ltd.
+ * All rights reserved.
+ */
+
+#include <linux/tcp.h>
+#include "xsc_eth.h"
+#include "xsc_eth_txrx.h"
+
+#define XSC_OPCODE_RAW 7
+
+static inline void xsc_dma_push(struct xsc_sq *sq, dma_addr_t addr, u32 size,
+				enum xsc_dma_map_type map_type)
+{
+	struct xsc_sq_dma *dma = xsc_dma_get(sq, sq->dma_fifo_pc++);
+
+	dma->addr = addr;
+	dma->size = size;
+	dma->type = map_type;
+}
+
+static void xsc_dma_unmap_wqe_err(struct xsc_sq *sq, u8 num_dma)
+{
+	struct xsc_adapter *adapter = sq->channel->adapter;
+	struct device *dev  = adapter->dev;
+
+	int i;
+
+	for (i = 0; i < num_dma; i++) {
+		struct xsc_sq_dma *last_pushed_dma = xsc_dma_get(sq, --sq->dma_fifo_pc);
+
+		xsc_tx_dma_unmap(dev, last_pushed_dma);
+	}
+}
+
+static inline void *xsc_sq_fetch_wqe(struct xsc_sq *sq, size_t size, u16 *pi)
+{
+	struct xsc_wq_cyc *wq = &sq->wq;
+	void *wqe;
+
+	/*caution, sp->pc is default to be zero*/
+	*pi  = xsc_wq_cyc_ctr2ix(wq, sq->pc);
+	wqe = xsc_wq_cyc_get_wqe(wq, *pi);
+	memset(wqe, 0, size);
+
+	return wqe;
+}
+
+static u16 xsc_tx_get_gso_ihs(struct xsc_sq *sq, struct sk_buff *skb)
+{
+	u16 ihs;
+
+	if (skb->encapsulation) {
+		ihs = skb_inner_transport_offset(skb) + inner_tcp_hdrlen(skb);
+	} else {
+		if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
+			ihs = skb_transport_offset(skb) + sizeof(struct udphdr);
+		else
+			ihs = skb_transport_offset(skb) + tcp_hdrlen(skb);
+	}
+
+	return ihs;
+}
+
+static void xsc_txwqe_build_cseg_csum(struct xsc_sq *sq,
+				      struct sk_buff *skb,
+				      struct xsc_send_wqe_ctrl_seg *cseg)
+{
+	if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
+		if (skb->encapsulation)
+			cseg->csum_en = XSC_ETH_WQE_INNER_AND_OUTER_CSUM;
+		else
+			cseg->csum_en = XSC_ETH_WQE_OUTER_CSUM;
+	} else {
+		cseg->csum_en = XSC_ETH_WQE_NONE_CSUM;
+	}
+}
+
+static void xsc_txwqe_build_csegs(struct xsc_sq *sq, struct sk_buff *skb,
+				  u16 mss, u16 ihs, u16 headlen,
+				  u8 opcode, u16 ds_cnt, u32 num_bytes,
+				  struct xsc_send_wqe_ctrl_seg *cseg)
+{
+	struct xsc_core_device *xdev = sq->cq.xdev;
+	int send_wqe_ds_num_log = ilog2(xdev->caps.send_ds_num);
+
+	xsc_txwqe_build_cseg_csum(sq, skb, cseg);
+
+	if (mss != 0) {
+		cseg->has_pph = 0;
+		cseg->so_type = 1;
+		cseg->so_hdr_len = ihs;
+		cseg->so_data_size = cpu_to_le16(mss);
+	}
+
+	cseg->msg_opcode =  opcode;
+	cseg->wqe_id = cpu_to_le16(sq->pc << send_wqe_ds_num_log);
+	cseg->ds_data_num = ds_cnt - XSC_SEND_WQEBB_CTRL_NUM_DS;
+	cseg->msg_len = cpu_to_le32(num_bytes);
+
+	cseg->ce = 1;
+}
+
+static int xsc_txwqe_build_dsegs(struct xsc_sq *sq, struct sk_buff *skb,
+				 u16 ihs, u16 headlen,
+				 struct xsc_wqe_data_seg *dseg)
+{
+	dma_addr_t dma_addr = 0;
+	u8 num_dma = 0;
+	int i;
+	struct xsc_adapter *adapter = sq->channel->adapter;
+	struct device *dev  = adapter->dev;
+
+	if (headlen) {
+		dma_addr = dma_map_single(dev, skb->data, headlen, DMA_TO_DEVICE);
+		if (unlikely(dma_mapping_error(dev, dma_addr)))
+			goto dma_unmap_wqe_err;
+
+		dseg->va = cpu_to_le64(dma_addr);
+		dseg->mkey  = cpu_to_le32(sq->mkey_be);
+		dseg->seg_len = cpu_to_le32(headlen);
+
+		xsc_dma_push(sq, dma_addr, headlen, XSC_DMA_MAP_SINGLE);
+		num_dma++;
+		dseg++;
+	}
+
+	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+		int fsz = skb_frag_size(frag);
+
+		dma_addr = skb_frag_dma_map(dev, frag, 0, fsz, DMA_TO_DEVICE);
+		if (unlikely(dma_mapping_error(dev, dma_addr)))
+			goto dma_unmap_wqe_err;
+
+		dseg->va = cpu_to_le64(dma_addr);
+		dseg->mkey = cpu_to_le32(sq->mkey_be);
+		dseg->seg_len = cpu_to_le32(fsz);
+
+		xsc_dma_push(sq, dma_addr, fsz, XSC_DMA_MAP_PAGE);
+		num_dma++;
+		dseg++;
+	}
+
+	return num_dma;
+
+dma_unmap_wqe_err:
+	xsc_dma_unmap_wqe_err(sq, num_dma);
+	return -ENOMEM;
+}
+
+static inline void xsc_sq_notify_hw(struct xsc_wq_cyc *wq, u16 pc,
+				    struct xsc_sq *sq)
+{
+	struct xsc_adapter *adapter = sq->channel->adapter;
+	struct xsc_core_device *xdev  = adapter->xdev;
+	union xsc_send_doorbell doorbell_value;
+	int send_ds_num_log = ilog2(xdev->caps.send_ds_num);
+
+	/*reverse wqe index to ds index*/
+	doorbell_value.next_pid = pc << send_ds_num_log;
+	doorbell_value.qp_num = sq->sqn;
+
+	/* Make sure that descriptors are written before
+	 * updating doorbell record and ringing the doorbell
+	 */
+	wmb();
+	writel(doorbell_value.send_data, REG_ADDR(xdev, xdev->regs.tx_db));
+}
+
+static void xsc_txwqe_complete(struct xsc_sq *sq, struct sk_buff *skb,
+			       u8 opcode, u16 ds_cnt, u8 num_wqebbs, u32 num_bytes, u8 num_dma,
+			       struct xsc_tx_wqe_info *wi)
+{
+	struct xsc_wq_cyc *wq = &sq->wq;
+
+	wi->num_bytes = num_bytes;
+	wi->num_dma = num_dma;
+	wi->num_wqebbs = num_wqebbs;
+	wi->skb = skb;
+
+	netdev_tx_sent_queue(sq->txq, num_bytes);
+
+	if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
+		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+
+	sq->pc += wi->num_wqebbs;
+
+	if (unlikely(!xsc_wqc_has_room_for(wq, sq->cc, sq->pc, sq->stop_room)))
+		netif_tx_stop_queue(sq->txq);
+
+	if (!netdev_xmit_more() || netif_xmit_stopped(sq->txq))
+		xsc_sq_notify_hw(wq, sq->pc, sq);
+}
+
+static uint32_t xsc_eth_xmit_frame(struct sk_buff *skb,
+				   struct xsc_sq *sq,
+				   struct xsc_tx_wqe *wqe,
+				   u16 pi)
+{
+	struct xsc_send_wqe_ctrl_seg *cseg;
+	struct xsc_wqe_data_seg *dseg;
+	struct xsc_tx_wqe_info *wi;
+	struct xsc_core_device *xdev = sq->cq.xdev;
+	u16 ds_cnt;
+	u16 mss, ihs, headlen;
+	u8 opcode;
+	u32 num_bytes, num_dma;
+	u8 num_wqebbs;
+
+retry_send:
+	/* Calc ihs and ds cnt, no writes to wqe yet */
+	/*ctrl-ds, it would be reduce in ds_data_num*/
+	ds_cnt = XSC_SEND_WQEBB_CTRL_NUM_DS;
+
+	/*in andes inline is bonding with gso*/
+	if (skb_is_gso(skb)) {
+		opcode    = XSC_OPCODE_RAW;
+		mss       = skb_shinfo(skb)->gso_size;
+		ihs       = xsc_tx_get_gso_ihs(sq, skb);
+		num_bytes = skb->len;
+	} else {
+		opcode    = XSC_OPCODE_RAW;
+		mss       = 0;
+		ihs       = 0;
+		num_bytes = skb->len;
+	}
+
+	/*linear data in skb*/
+	headlen = skb->len - skb->data_len;
+	ds_cnt += !!headlen;
+	ds_cnt += skb_shinfo(skb)->nr_frags;
+
+	/* Check packet size. */
+	if (unlikely(mss == 0 && num_bytes > sq->hw_mtu))
+		goto err_drop;
+
+	num_wqebbs = DIV_ROUND_UP(ds_cnt, xdev->caps.send_ds_num);
+	/*if ds_cnt exceed one wqe, drop it*/
+	if (num_wqebbs != 1) {
+		if (skb_linearize(skb))
+			goto err_drop;
+		goto retry_send;
+	}
+
+	/* fill wqe */
+	wi   = (struct xsc_tx_wqe_info *)&sq->db.wqe_info[pi];
+	cseg = &wqe->ctrl;
+	dseg = &wqe->data[0];
+
+	if (unlikely(num_bytes == 0))
+		goto err_drop;
+
+	xsc_txwqe_build_csegs(sq, skb, mss, ihs, headlen,
+			      opcode, ds_cnt, num_bytes, cseg);
+
+	/*inline header is also use dma to transport*/
+	num_dma = xsc_txwqe_build_dsegs(sq, skb, ihs, headlen, dseg);
+	if (unlikely(num_dma < 0))
+		goto err_drop;
+
+	xsc_txwqe_complete(sq, skb, opcode, ds_cnt, num_wqebbs, num_bytes,
+			   num_dma, wi);
+
+	return NETDEV_TX_OK;
+
+err_drop:
+	dev_kfree_skb_any(skb);
+
+	return NETDEV_TX_OK;
+}
+
+netdev_tx_t xsc_eth_xmit_start(struct sk_buff *skb, struct net_device *netdev)
+{
+	u32 ret;
+	u32 queue_id;
+	struct xsc_sq *sq;
+	struct xsc_tx_wqe *wqe;
+	u16 pi;
+	struct xsc_adapter *adapter = netdev_priv(netdev);
+	struct xsc_core_device *xdev = adapter->xdev;
+
+	if (!skb)
+		return NETDEV_TX_OK;
+
+	if (!adapter)
+		return NETDEV_TX_BUSY;
+
+	if (adapter->status != XSCALE_ETH_DRIVER_OK)
+		return NETDEV_TX_BUSY;
+
+	queue_id = skb_get_queue_mapping(skb);
+	assert(adapter->xdev, queue_id < XSC_ETH_MAX_TC_TOTAL);
+
+	sq = adapter->txq2sq[queue_id];
+	if (!sq)
+		return NETDEV_TX_BUSY;
+
+	wqe = xsc_sq_fetch_wqe(sq, xdev->caps.send_ds_num * XSC_SEND_WQE_DS, &pi);
+	assert(adapter->xdev, wqe);
+
+	ret = xsc_eth_xmit_frame(skb, sq, wqe, pi);
+
+	return ret;
+}
diff --git a/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_txrx.h b/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_txrx.h
index 18cafd410..bc5932812 100644
--- a/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_txrx.h
+++ b/drivers/net/ethernet/yunsilicon/xsc/net/xsc_eth_txrx.h
@@ -6,8 +6,17 @@
 #ifndef XSC_RXTX_H
 #define XSC_RXTX_H
 
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
 #include "xsc_eth.h"
 
+enum {
+	XSC_ETH_WQE_NONE_CSUM,
+	XSC_ETH_WQE_INNER_CSUM,
+	XSC_ETH_WQE_OUTER_CSUM,
+	XSC_ETH_WQE_INNER_AND_OUTER_CSUM,
+};
+
 void xsc_cq_notify_hw_rearm(struct xsc_cq *cq);
 void xsc_cq_notify_hw(struct xsc_cq *cq);
 int xsc_eth_napi_poll(struct napi_struct *napi, int budget);
@@ -23,4 +32,31 @@ struct sk_buff *xsc_skb_from_cqe_nonlinear(struct xsc_rq *rq,
 					   u32 cqe_bcnt, u8 has_pph);
 int xsc_poll_rx_cq(struct xsc_cq *cq, int budget);
 
+netdev_tx_t xsc_eth_xmit_start(struct sk_buff *skb, struct net_device *netdev);
+
+static inline void xsc_tx_dma_unmap(struct device *dev, struct xsc_sq_dma *dma)
+{
+	switch (dma->type) {
+	case XSC_DMA_MAP_SINGLE:
+		dma_unmap_single(dev, dma->addr, dma->size, DMA_TO_DEVICE);
+		break;
+	case XSC_DMA_MAP_PAGE:
+		dma_unmap_page(dev, dma->addr, dma->size, DMA_TO_DEVICE);
+		break;
+	default:
+		break;
+	}
+}
+
+static inline struct xsc_sq_dma *xsc_dma_get(struct xsc_sq *sq, u32 i)
+{
+	return &sq->db.dma_fifo[i & sq->dma_fifo_mask];
+}
+
+static inline bool xsc_wqc_has_room_for(struct xsc_wq_cyc *wq,
+					u16 cc, u16 pc, u16 n)
+{
+	return (xsc_wq_cyc_ctr2ix(wq, cc - pc) >= n) || (cc == pc);
+}
+
 #endif /* XSC_RXTX_H */
diff --git a/drivers/net/ethernet/yunsilicon/xsc/net/xsc_queue.h b/drivers/net/ethernet/yunsilicon/xsc/net/xsc_queue.h
index 89f710a52..a6f0ec807 100644
--- a/drivers/net/ethernet/yunsilicon/xsc/net/xsc_queue.h
+++ b/drivers/net/ethernet/yunsilicon/xsc/net/xsc_queue.h
@@ -62,6 +62,8 @@ enum {
 #define XSC_RECV_WQEBB_NUM_DS	        (XSC_RECV_WQE_BB / XSC_RECV_WQE_DS)
 #define XSC_LOG_RECV_WQEBB_NUM_DS	ilog2(XSC_RECV_WQEBB_NUM_DS)
 
+#define XSC_SEND_WQEBB_CTRL_NUM_DS	1
+
 /* each ds holds one fragment in skb */
 #define XSC_MAX_RX_FRAGS        4
 #define XSC_RX_FRAG_SZ_ORDER    0
@@ -182,6 +184,11 @@ struct xsc_tx_wqe_info {
 	u8  num_dma;
 };
 
+struct xsc_tx_wqe {
+	struct xsc_send_wqe_ctrl_seg ctrl;
+	struct xsc_wqe_data_seg data[];
+};
+
 struct xsc_sq {
 	struct xsc_core_qp		cqp;
 	/* dirtied @completion */
-- 
2.43.0

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