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Message-ID: <5db8b856-27fe-41df-82df-774a3ec312a7@intel.com>
Date: Mon, 4 Dec 2023 11:15:47 +0100
From: Wojciech Drewek <wojciech.drewek@...el.com>
To: Jijie Shao <shaojijie@...wei.com>, <yisen.zhuang@...wei.com>,
<salil.mehta@...wei.com>, <davem@...emloft.net>,
<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>
CC: <shenjian15@...wei.com>, <wangjie125@...wei.com>,
<liuyonglong@...wei.com>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 net 1/2] net: hns: fix wrong head when modify the tx
feature when sending packets
On 04.12.2023 02:10, Jijie Shao wrote:
> From: Yonglong Liu <liuyonglong@...wei.com>
>
> When modify the tx feature, the hns driver will modify the
Upon changing the...
> maybe_stop_tx() and fill_desc() functions, if the modify happens
> during packet sending, will cause the hardware and software
> pointers do not match, and the port can not work anymore.
>
> This patch deletes the maybe_stop_tx() and fill_desc() functions
> modification when setting tx feature, and use the skb_is_gro()
> to determine use tso functions or non-tso functions when packets
> sending.
and use the skb_is_gro() to determine which functions to use in the tx path.
>
> Fixes: 38f616da1c28 ("net:hns: Add support of ethtool TSO set option for Hip06 in HNS")
> Signed-off-by: Yonglong Liu <liuyonglong@...wei.com>
> Signed-off-by: Jijie Shao <shaojijie@...wei.com>
> ---
Some commit msg suggestions, other than that:
Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>
> drivers/net/ethernet/hisilicon/hns/hns_enet.c | 53 +++++++++++--------
> drivers/net/ethernet/hisilicon/hns/hns_enet.h | 3 +-
> 2 files changed, 33 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
> index 0900abf5c508..8a713eed4465 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
> @@ -142,7 +142,8 @@ MODULE_DEVICE_TABLE(acpi, hns_enet_acpi_match);
>
> static void fill_desc(struct hnae_ring *ring, void *priv,
> int size, dma_addr_t dma, int frag_end,
> - int buf_num, enum hns_desc_type type, int mtu)
> + int buf_num, enum hns_desc_type type, int mtu,
> + bool is_gso)
> {
> struct hnae_desc *desc = &ring->desc[ring->next_to_use];
> struct hnae_desc_cb *desc_cb = &ring->desc_cb[ring->next_to_use];
> @@ -275,6 +276,15 @@ static int hns_nic_maybe_stop_tso(
> return 0;
> }
>
> +static int hns_nic_maybe_stop_tx_v2(struct sk_buff **out_skb, int *bnum,
> + struct hnae_ring *ring)
> +{
> + if (skb_is_gso(*out_skb))
> + return hns_nic_maybe_stop_tso(out_skb, bnum, ring);
> + else
> + return hns_nic_maybe_stop_tx(out_skb, bnum, ring);
> +}
> +
> static void fill_tso_desc(struct hnae_ring *ring, void *priv,
> int size, dma_addr_t dma, int frag_end,
> int buf_num, enum hns_desc_type type, int mtu)
> @@ -300,6 +310,19 @@ static void fill_tso_desc(struct hnae_ring *ring, void *priv,
> mtu);
> }
>
> +static void fill_desc_v2(struct hnae_ring *ring, void *priv,
> + int size, dma_addr_t dma, int frag_end,
> + int buf_num, enum hns_desc_type type, int mtu,
> + bool is_gso)
> +{
> + if (is_gso)
> + fill_tso_desc(ring, priv, size, dma, frag_end, buf_num, type,
> + mtu);
> + else
> + fill_v2_desc(ring, priv, size, dma, frag_end, buf_num, type,
> + mtu);
> +}
> +
> netdev_tx_t hns_nic_net_xmit_hw(struct net_device *ndev,
> struct sk_buff *skb,
> struct hns_nic_ring_data *ring_data)
> @@ -313,6 +336,7 @@ netdev_tx_t hns_nic_net_xmit_hw(struct net_device *ndev,
> int seg_num;
> dma_addr_t dma;
> int size, next_to_use;
> + bool is_gso;
> int i;
>
> switch (priv->ops.maybe_stop_tx(&skb, &buf_num, ring)) {
> @@ -339,8 +363,9 @@ netdev_tx_t hns_nic_net_xmit_hw(struct net_device *ndev,
> ring->stats.sw_err_cnt++;
> goto out_err_tx_ok;
> }
> + is_gso = skb_is_gso(skb);
> priv->ops.fill_desc(ring, skb, size, dma, seg_num == 1 ? 1 : 0,
> - buf_num, DESC_TYPE_SKB, ndev->mtu);
> + buf_num, DESC_TYPE_SKB, ndev->mtu, is_gso);
>
> /* fill the fragments */
> for (i = 1; i < seg_num; i++) {
> @@ -354,7 +379,7 @@ netdev_tx_t hns_nic_net_xmit_hw(struct net_device *ndev,
> }
> priv->ops.fill_desc(ring, skb_frag_page(frag), size, dma,
> seg_num - 1 == i ? 1 : 0, buf_num,
> - DESC_TYPE_PAGE, ndev->mtu);
> + DESC_TYPE_PAGE, ndev->mtu, is_gso);
> }
>
> /*complete translate all packets*/
> @@ -1776,15 +1801,6 @@ static int hns_nic_set_features(struct net_device *netdev,
> netdev_info(netdev, "enet v1 do not support tso!\n");
> break;
> default:
> - if (features & (NETIF_F_TSO | NETIF_F_TSO6)) {
> - priv->ops.fill_desc = fill_tso_desc;
> - priv->ops.maybe_stop_tx = hns_nic_maybe_stop_tso;
> - /* The chip only support 7*4096 */
> - netif_set_tso_max_size(netdev, 7 * 4096);
> - } else {
> - priv->ops.fill_desc = fill_v2_desc;
> - priv->ops.maybe_stop_tx = hns_nic_maybe_stop_tx;
> - }
> break;
> }
> netdev->features = features;
> @@ -2159,16 +2175,9 @@ static void hns_nic_set_priv_ops(struct net_device *netdev)
> priv->ops.maybe_stop_tx = hns_nic_maybe_stop_tx;
> } else {
> priv->ops.get_rxd_bnum = get_v2rx_desc_bnum;
> - if ((netdev->features & NETIF_F_TSO) ||
> - (netdev->features & NETIF_F_TSO6)) {
> - priv->ops.fill_desc = fill_tso_desc;
> - priv->ops.maybe_stop_tx = hns_nic_maybe_stop_tso;
> - /* This chip only support 7*4096 */
> - netif_set_tso_max_size(netdev, 7 * 4096);
> - } else {
> - priv->ops.fill_desc = fill_v2_desc;
> - priv->ops.maybe_stop_tx = hns_nic_maybe_stop_tx;
> - }
> + priv->ops.fill_desc = fill_desc_v2;
> + priv->ops.maybe_stop_tx = hns_nic_maybe_stop_tx_v2;
> + netif_set_tso_max_size(netdev, 7 * 4096);
> /* enable tso when init
> * control tso on/off through TSE bit in bd
> */
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.h b/drivers/net/ethernet/hisilicon/hns/hns_enet.h
> index ffa9d6573f54..3f3ee032f631 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_enet.h
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.h
> @@ -44,7 +44,8 @@ struct hns_nic_ring_data {
> struct hns_nic_ops {
> void (*fill_desc)(struct hnae_ring *ring, void *priv,
> int size, dma_addr_t dma, int frag_end,
> - int buf_num, enum hns_desc_type type, int mtu);
> + int buf_num, enum hns_desc_type type, int mtu,
> + bool is_gso);
> int (*maybe_stop_tx)(struct sk_buff **out_skb,
> int *bnum, struct hnae_ring *ring);
> void (*get_rxd_bnum)(u32 bnum_flag, int *out_bnum);
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