[RESEND PATCH net-next 0/2] net: hns3: add support for TX push

[RESEND PATCH net-next 0/2] net: hns3: add support for TX push

[Guangbin Huang]

This series adds TX push support for the HNS3 ethernet driver.

Yufeng Mo (2):
  net: hns3: add support for TX push mode
  net: hns3: add ethtool priv-flag for TX push

 drivers/net/ethernet/hisilicon/hns3/hnae3.h   |  2 +
 .../net/ethernet/hisilicon/hns3/hns3_enet.c   | 82 ++++++++++++++++++-
 .../net/ethernet/hisilicon/hns3/hns3_enet.h   |  6 ++
 .../ethernet/hisilicon/hns3/hns3_ethtool.c    | 21 ++++-
 .../hisilicon/hns3/hns3pf/hclge_main.c        | 11 ++-
 .../hisilicon/hns3/hns3pf/hclge_main.h        |  8 ++
 .../hisilicon/hns3/hns3vf/hclgevf_main.c      | 11 ++-
 .../hisilicon/hns3/hns3vf/hclgevf_main.h      |  8 ++
 8 files changed, 140 insertions(+), 9 deletions(-)

-- 
2.33.0

[RESEND PATCH net-next 1/2] net: hns3: add support for TX push mode

[Guangbin Huang]

From: Yufeng Mo <moyufeng@huawei.com>

For the device that supports the TX push capability, the BD can
be directly copied to the device memory. However, due to hardware
restrictions, the push mode can be used only when there are no
more than two BDs, otherwise, the doorbell mode based on device
memory is used.

Signed-off-by: Yufeng Mo <moyufeng@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hnae3.h   |  1 +
 .../net/ethernet/hisilicon/hns3/hns3_enet.c   | 79 ++++++++++++++++++-
 .../net/ethernet/hisilicon/hns3/hns3_enet.h   |  6 ++
 .../ethernet/hisilicon/hns3/hns3_ethtool.c    |  2 +
 .../hisilicon/hns3/hns3pf/hclge_main.c        | 11 ++-
 .../hisilicon/hns3/hns3pf/hclge_main.h        |  8 ++
 .../hisilicon/hns3/hns3vf/hclgevf_main.c      | 11 ++-
 .../hisilicon/hns3/hns3vf/hclgevf_main.h      |  8 ++
 8 files changed, 118 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hnae3.h b/drivers/net/ethernet/hisilicon/hns3/hnae3.h
index 9298fbecb31a..6f18c9a03231 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hnae3.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hnae3.h
@@ -167,6 +167,7 @@ struct hnae3_handle;
 
 struct hnae3_queue {
 	void __iomem *io_base;
+	void __iomem *mem_base;
 	struct hnae3_ae_algo *ae_algo;
 	struct hnae3_handle *handle;
 	int tqp_index;		/* index in a handle */
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index babc5d7a3b52..0b8a73c40b12 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -2028,9 +2028,73 @@ static int hns3_fill_skb_to_desc(struct hns3_enet_ring *ring,
 	return bd_num;
 }
 
+static void hns3_tx_push_bd(struct hns3_enet_ring *ring, int num)
+{
+#define HNS3_BYTES_PER_64BIT		8
+
+	struct hns3_desc desc[HNS3_MAX_PUSH_BD_NUM] = {};
+	int offset = 0;
+
+	/* make sure everything is visible to device before
+	 * excuting tx push or updating doorbell
+	 */
+	dma_wmb();
+
+	do {
+		int idx = (ring->next_to_use - num + ring->desc_num) %
+			  ring->desc_num;
+
+		u64_stats_update_begin(&ring->syncp);
+		ring->stats.tx_push++;
+		u64_stats_update_end(&ring->syncp);
+		memcpy(&desc[offset], &ring->desc[idx],
+		       sizeof(struct hns3_desc));
+		offset++;
+	} while (--num);
+
+	__iowrite64_copy(ring->tqp->mem_base, desc,
+			 (sizeof(struct hns3_desc) * HNS3_MAX_PUSH_BD_NUM) /
+			 HNS3_BYTES_PER_64BIT);
+
+	io_stop_wc();
+}
+
+static void hns3_tx_mem_doorbell(struct hns3_enet_ring *ring)
+{
+#define HNS3_MEM_DOORBELL_OFFSET	64
+
+	__le64 bd_num = cpu_to_le64((u64)ring->pending_buf);
+
+	/* make sure everything is visible to device before
+	 * excuting tx push or updating doorbell
+	 */
+	dma_wmb();
+
+	__iowrite64_copy(ring->tqp->mem_base + HNS3_MEM_DOORBELL_OFFSET,
+			 &bd_num, 1);
+	u64_stats_update_begin(&ring->syncp);
+	ring->stats.tx_mem_doorbell += ring->pending_buf;
+	u64_stats_update_end(&ring->syncp);
+
+	io_stop_wc();
+}
+
 static void hns3_tx_doorbell(struct hns3_enet_ring *ring, int num,
 			     bool doorbell)
 {
+	struct net_device *netdev = ring_to_netdev(ring);
+	struct hns3_nic_priv *priv = netdev_priv(netdev);
+
+	/* when tx push is enabled, the packet whose number of BD below
+	 * HNS3_MAX_PUSH_BD_NUM can be pushed directly.
+	 */
+	if (test_bit(HNS3_NIC_STATE_TX_PUSH_ENABLE, &priv->state) && num &&
+	    !ring->pending_buf && num <= HNS3_MAX_PUSH_BD_NUM && doorbell) {
+		hns3_tx_push_bd(ring, num);
+		WRITE_ONCE(ring->last_to_use, ring->next_to_use);
+		return;
+	}
+
 	ring->pending_buf += num;
 
 	if (!doorbell) {
@@ -2038,11 +2102,12 @@ static void hns3_tx_doorbell(struct hns3_enet_ring *ring, int num,
 		return;
 	}
 
-	if (!ring->pending_buf)
-		return;
+	if (ring->tqp->mem_base)
+		hns3_tx_mem_doorbell(ring);
+	else
+		writel(ring->pending_buf,
+		       ring->tqp->io_base + HNS3_RING_TX_RING_TAIL_REG);
 
-	writel(ring->pending_buf,
-	       ring->tqp->io_base + HNS3_RING_TX_RING_TAIL_REG);
 	ring->pending_buf = 0;
 	WRITE_ONCE(ring->last_to_use, ring->next_to_use);
 }
@@ -2732,6 +2797,9 @@ static void hns3_dump_queue_stats(struct net_device *ndev,
 		    "seg_pkt_cnt: %llu, tx_more: %llu, restart_queue: %llu, tx_busy: %llu\n",
 		    tx_ring->stats.seg_pkt_cnt, tx_ring->stats.tx_more,
 		    tx_ring->stats.restart_queue, tx_ring->stats.tx_busy);
+
+	netdev_info(ndev, "tx_push: %llu, tx_mem_doorbell: %llu\n",
+		    tx_ring->stats.tx_push, tx_ring->stats.tx_mem_doorbell);
 }
 
 static void hns3_dump_queue_reg(struct net_device *ndev,
@@ -5094,6 +5162,9 @@ static void hns3_state_init(struct hnae3_handle *handle)
 
 	set_bit(HNS3_NIC_STATE_INITED, &priv->state);
 
+	if (test_bit(HNAE3_DEV_SUPPORT_TX_PUSH_B, ae_dev->caps))
+		set_bit(HNS3_NIC_STATE_TX_PUSH_ENABLE, &priv->state);
+
 	if (ae_dev->dev_version >= HNAE3_DEVICE_VERSION_V3)
 		set_bit(HNAE3_PFLAG_LIMIT_PROMISC, &handle->supported_pflags);
 
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
index a05a0c7423ce..4a3253692dcc 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
@@ -7,6 +7,7 @@
 #include <linux/dim.h>
 #include <linux/if_vlan.h>
 #include <net/page_pool.h>
+#include <asm/barrier.h>
 
 #include "hnae3.h"
 
@@ -25,9 +26,12 @@ enum hns3_nic_state {
 	HNS3_NIC_STATE2_RESET_REQUESTED,
 	HNS3_NIC_STATE_HW_TX_CSUM_ENABLE,
 	HNS3_NIC_STATE_RXD_ADV_LAYOUT_ENABLE,
+	HNS3_NIC_STATE_TX_PUSH_ENABLE,
 	HNS3_NIC_STATE_MAX
 };
 
+#define HNS3_MAX_PUSH_BD_NUM		2
+
 #define HNS3_RING_RX_RING_BASEADDR_L_REG	0x00000
 #define HNS3_RING_RX_RING_BASEADDR_H_REG	0x00004
 #define HNS3_RING_RX_RING_BD_NUM_REG		0x00008
@@ -410,6 +414,8 @@ struct ring_stats {
 			u64 tx_pkts;
 			u64 tx_bytes;
 			u64 tx_more;
+			u64 tx_push;
+			u64 tx_mem_doorbell;
 			u64 restart_queue;
 			u64 tx_busy;
 			u64 tx_copy;
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
index c06c39ece80d..6469238ae090 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
@@ -23,6 +23,8 @@ static const struct hns3_stats hns3_txq_stats[] = {
 	HNS3_TQP_STAT("packets", tx_pkts),
 	HNS3_TQP_STAT("bytes", tx_bytes),
 	HNS3_TQP_STAT("more", tx_more),
+	HNS3_TQP_STAT("push", tx_push),
+	HNS3_TQP_STAT("mem_doorbell", tx_mem_doorbell),
 	HNS3_TQP_STAT("wake", restart_queue),
 	HNS3_TQP_STAT("busy", tx_busy),
 	HNS3_TQP_STAT("copy", tx_copy),
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index 24f7afacae02..78d0498bdabc 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -1643,6 +1643,7 @@ static int hclge_config_gro(struct hclge_dev *hdev)
 
 static int hclge_alloc_tqps(struct hclge_dev *hdev)
 {
+	struct hnae3_ae_dev *ae_dev = pci_get_drvdata(hdev->pdev);
 	struct hclge_comm_tqp *tqp;
 	int i;
 
@@ -1676,6 +1677,14 @@ static int hclge_alloc_tqps(struct hclge_dev *hdev)
 					 (i - HCLGE_TQP_MAX_SIZE_DEV_V2) *
 					 HCLGE_TQP_REG_SIZE;
 
+		/* when device supports tx push and has device memory,
+		 * the queue can execute push mode or doorbell mode on
+		 * device memory.
+		 */
+		if (test_bit(HNAE3_DEV_SUPPORT_TX_PUSH_B, ae_dev->caps))
+			tqp->q.mem_base = hdev->hw.hw.mem_base +
+					  HCLGE_TQP_MEM_OFFSET(hdev, i);
+
 		tqp++;
 	}
 
@@ -11008,8 +11017,6 @@ static void hclge_uninit_client_instance(struct hnae3_client *client,
 
 static int hclge_dev_mem_map(struct hclge_dev *hdev)
 {
-#define HCLGE_MEM_BAR		4
-
 	struct pci_dev *pdev = hdev->pdev;
 	struct hclge_hw *hw = &hdev->hw;
 
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
index adfb26e79262..f7f5a4b09068 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h
@@ -169,6 +169,14 @@ enum HLCGE_PORT_TYPE {
 #define HCLGE_VECTOR0_ALL_MSIX_ERR_B	6U
 #define HCLGE_TRIGGER_IMP_RESET_B	7U
 
+#define HCLGE_TQP_MEM_SIZE		0x10000
+#define HCLGE_MEM_BAR			4
+/* in the bar4, the first half is for roce, and the second half is for nic */
+#define HCLGE_NIC_MEM_OFFSET(hdev)	\
+	(pci_resource_len((hdev)->pdev, HCLGE_MEM_BAR) >> 1)
+#define HCLGE_TQP_MEM_OFFSET(hdev, i)	\
+	(HCLGE_NIC_MEM_OFFSET(hdev) + HCLGE_TQP_MEM_SIZE * (i))
+
 #define HCLGE_MAC_DEFAULT_FRAME \
 	(ETH_HLEN + ETH_FCS_LEN + 2 * VLAN_HLEN + ETH_DATA_LEN)
 #define HCLGE_MAC_MIN_FRAME		64
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
index 7df87610ad96..c2224e4c17a3 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
@@ -321,6 +321,7 @@ static int hclgevf_get_pf_media_type(struct hclgevf_dev *hdev)
 
 static int hclgevf_alloc_tqps(struct hclgevf_dev *hdev)
 {
+	struct hnae3_ae_dev *ae_dev = pci_get_drvdata(hdev->pdev);
 	struct hclge_comm_tqp *tqp;
 	int i;
 
@@ -354,6 +355,14 @@ static int hclgevf_alloc_tqps(struct hclgevf_dev *hdev)
 					 (i - HCLGEVF_TQP_MAX_SIZE_DEV_V2) *
 					 HCLGEVF_TQP_REG_SIZE;
 
+		/* when device supports tx push and has device memory,
+		 * the queue can execute push mode or doorbell mode on
+		 * device memory.
+		 */
+		if (test_bit(HNAE3_DEV_SUPPORT_TX_PUSH_B, ae_dev->caps))
+			tqp->q.mem_base = hdev->hw.hw.mem_base +
+					  HCLGEVF_TQP_MEM_OFFSET(hdev, i);
+
 		tqp++;
 	}
 
@@ -2547,8 +2556,6 @@ static void hclgevf_uninit_client_instance(struct hnae3_client *client,
 
 static int hclgevf_dev_mem_map(struct hclgevf_dev *hdev)
 {
-#define HCLGEVF_MEM_BAR		4
-
 	struct pci_dev *pdev = hdev->pdev;
 	struct hclgevf_hw *hw = &hdev->hw;
 
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h
index 502ca1ce1a90..4b00fd44f118 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h
@@ -96,6 +96,14 @@
 
 #define HCLGEVF_RSS_IND_TBL_SIZE		512
 
+#define HCLGEVF_TQP_MEM_SIZE		0x10000
+#define HCLGEVF_MEM_BAR			4
+/* in the bar4, the first half is for roce, and the second half is for nic */
+#define HCLGEVF_NIC_MEM_OFFSET(hdev)	\
+	(pci_resource_len((hdev)->pdev, HCLGEVF_MEM_BAR) >> 1)
+#define HCLGEVF_TQP_MEM_OFFSET(hdev, i)		\
+	(HCLGEVF_NIC_MEM_OFFSET(hdev) + HCLGEVF_TQP_MEM_SIZE * (i))
+
 #define HCLGEVF_MAC_MAX_FRAME		9728
 
 #define HCLGEVF_STATS_TIMER_INTERVAL	36U
-- 
2.33.0

Re: [RESEND PATCH net-next 1/2] net: hns3: add support for TX push mode

[Jakub Kicinski]

On Tue, 25 Jan 2022 15:21:48 +0800 Guangbin Huang wrote:
> +	__iowrite64_copy(ring->tqp->mem_base, desc,
> +			 (sizeof(struct hns3_desc) * HNS3_MAX_PUSH_BD_NUM) /
> +			 HNS3_BYTES_PER_64BIT);

Doesn't build, missing closing bracket?

Re: [RESEND PATCH net-next 1/2] net: hns3: add support for TX push mode

[huangguangbin (A)]

On 2022/1/26 11:50, Jakub Kicinski wrote:
> On Tue, 25 Jan 2022 15:21:48 +0800 Guangbin Huang wrote:
>> +	__iowrite64_copy(ring->tqp->mem_base, desc,
>> +			 (sizeof(struct hns3_desc) * HNS3_MAX_PUSH_BD_NUM) /
>> +			 HNS3_BYTES_PER_64BIT);
> 
> Doesn't build, missing closing bracket?
> .
> 
Hi Jakub,
Sorry, I didn't notice that net-next has not been merged patch
"asm-generic: Add missing brackets for io_stop_wc macro" at
https://git.kernel.org/arm64/c/440323b6cf5b.

When that patch can be merged in net-next?

Re: [RESEND PATCH net-next 1/2] net: hns3: add support for TX push mode

[Jakub Kicinski]

On Wed, 26 Jan 2022 14:48:30 +0800 huangguangbin (A) wrote:
> On 2022/1/26 11:50, Jakub Kicinski wrote:
> > On Tue, 25 Jan 2022 15:21:48 +0800 Guangbin Huang wrote:  
> >> +	__iowrite64_copy(ring->tqp->mem_base, desc,
> >> +			 (sizeof(struct hns3_desc) * HNS3_MAX_PUSH_BD_NUM) /
> >> +			 HNS3_BYTES_PER_64BIT);  
> > 
> > Doesn't build, missing closing bracket?
> > .
> >   
> Hi Jakub,
> Sorry, I didn't notice that net-next has not been merged patch
> "asm-generic: Add missing brackets for io_stop_wc macro" at
> https://git.kernel.org/arm64/c/440323b6cf5b.
> 
> When that patch can be merged in net-next?

Likely by the end of the week.

[RESEND PATCH net-next 2/2] net: hns3: add ethtool priv-flag for TX push

[Guangbin Huang]

From: Yufeng Mo <moyufeng@huawei.com>

Add a control private flag in ethtool for enable/disable
TX push feature.

Signed-off-by: Yufeng Mo <moyufeng@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hnae3.h   |  1 +
 .../net/ethernet/hisilicon/hns3/hns3_enet.c   |  5 ++++-
 .../ethernet/hisilicon/hns3/hns3_ethtool.c    | 19 ++++++++++++++++++-
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hnae3.h b/drivers/net/ethernet/hisilicon/hns3/hnae3.h
index 6f18c9a03231..c40c45b75065 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hnae3.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hnae3.h
@@ -818,6 +818,7 @@ struct hnae3_roce_private_info {
 
 enum hnae3_pflag {
 	HNAE3_PFLAG_LIMIT_PROMISC,
+	HNAE3_PFLAG_PUSH_ENABLE,
 	HNAE3_PFLAG_MAX
 };
 
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 0b8a73c40b12..97222192d68c 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -5162,8 +5162,11 @@ static void hns3_state_init(struct hnae3_handle *handle)
 
 	set_bit(HNS3_NIC_STATE_INITED, &priv->state);
 
-	if (test_bit(HNAE3_DEV_SUPPORT_TX_PUSH_B, ae_dev->caps))
+	if (test_bit(HNAE3_DEV_SUPPORT_TX_PUSH_B, ae_dev->caps)) {
 		set_bit(HNS3_NIC_STATE_TX_PUSH_ENABLE, &priv->state);
+		handle->priv_flags |= BIT(HNAE3_PFLAG_PUSH_ENABLE);
+		set_bit(HNAE3_PFLAG_PUSH_ENABLE, &handle->supported_pflags);
+	}
 
 	if (ae_dev->dev_version >= HNAE3_DEVICE_VERSION_V3)
 		set_bit(HNAE3_PFLAG_LIMIT_PROMISC, &handle->supported_pflags);
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
index 6469238ae090..a7cf5fee9f48 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
@@ -440,8 +440,25 @@ static void hns3_update_limit_promisc_mode(struct net_device *netdev,
 	hns3_request_update_promisc_mode(handle);
 }
 
+static void hns3_update_state(struct net_device *netdev,
+			      enum hns3_nic_state state, bool enable)
+{
+	struct hns3_nic_priv *priv = netdev_priv(netdev);
+
+	if (enable)
+		set_bit(state, &priv->state);
+	else
+		clear_bit(state, &priv->state);
+}
+
+static void hns3_update_push_state(struct net_device *netdev, bool enable)
+{
+	hns3_update_state(netdev, HNS3_NIC_STATE_TX_PUSH_ENABLE, enable);
+}
+
 static const struct hns3_pflag_desc hns3_priv_flags[HNAE3_PFLAG_MAX] = {
-	{ "limit_promisc",	hns3_update_limit_promisc_mode }
+	{ "limit_promisc",	hns3_update_limit_promisc_mode },
+	{ "tx_push_enable",	hns3_update_push_state }
 };
 
 static int hns3_get_sset_count(struct net_device *netdev, int stringset)
-- 
2.33.0

Re: [RESEND PATCH net-next 2/2] net: hns3: add ethtool priv-flag for TX push

[Jakub Kicinski]

On Tue, 25 Jan 2022 15:21:49 +0800 Guangbin Huang wrote:
> From: Yufeng Mo <moyufeng@huawei.com>
> 
> Add a control private flag in ethtool for enable/disable
> TX push feature.

I think it's a pretty standard feature for NICs which also support RDMA.
Mellanox/nVidia has it (or at least it the previous gen HW did),
Broadcom's bnxt driver does it as well.

Can we make this a standard knob via ethtool? Not entirely sure under
which switch, maybe it's okay to add it under -g? Perhaps we need a new
command similar to -k but for features contained entirely to the driver?

Re: [RESEND PATCH net-next 2/2] net: hns3: add ethtool priv-flag for TX push

[huangguangbin (A)]

On 2022/1/26 11:55, Jakub Kicinski wrote:
> On Tue, 25 Jan 2022 15:21:49 +0800 Guangbin Huang wrote:
>> From: Yufeng Mo <moyufeng@huawei.com>
>>
>> Add a control private flag in ethtool for enable/disable
>> TX push feature.
> 
> I think it's a pretty standard feature for NICs which also support RDMA.
> Mellanox/nVidia has it (or at least it the previous gen HW did),
> Broadcom's bnxt driver does it as well.
> 
> Can we make this a standard knob via ethtool? Not entirely sure under
> which switch, maybe it's okay to add it under -g? Perhaps we need a new
> command similar to -k but for features contained entirely to the driver?
> .
> 
Hi Jakub,
We consider adding a new command for this feature. We will send RFC after we finish it.