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Date: Tue, 24 Jul 2018 07:53:58 -0700
From: Alexander Duyck <alexander.duyck@...il.com>
To: Saeed Mahameed <saeedm@...lanox.com>
Cc: "David S. Miller" <davem@...emloft.net>,
Netdev <netdev@...r.kernel.org>,
Boris Pismenny <borisp@...lanox.com>
Subject: Re: [net-next V2 12/12] net/mlx5e: Use PARTIAL_GSO for UDP segmentation
On Mon, Jul 23, 2018 at 3:11 PM, Saeed Mahameed <saeedm@...lanox.com> wrote:
> From: Boris Pismenny <borisp@...lanox.com>
>
> This patch removes the splitting of UDP_GSO_L4 packets in the driver,
> and exposes UDP_GSO_L4 as a PARTIAL_GSO feature. Thus, the network stack
> is not responsible for splitting the packet into two.
>
> Signed-off-by: Boris Pismenny <borisp@...lanox.com>
> Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
> ---
> .../net/ethernet/mellanox/mlx5/core/Makefile | 4 +-
> .../mellanox/mlx5/core/en_accel/en_accel.h | 27 +++--
> .../mellanox/mlx5/core/en_accel/rxtx.c | 109 ------------------
> .../mellanox/mlx5/core/en_accel/rxtx.h | 14 ---
> .../net/ethernet/mellanox/mlx5/core/en_main.c | 9 +-
> 5 files changed, 23 insertions(+), 140 deletions(-)
> delete mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en_accel/rxtx.c
> delete mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en_accel/rxtx.h
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
> index 55d5a5c2e9d8..fa7fcca5dc78 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
> @@ -14,8 +14,8 @@ mlx5_core-$(CONFIG_MLX5_FPGA) += fpga/cmd.o fpga/core.o fpga/conn.o fpga/sdk.o \
> fpga/ipsec.o fpga/tls.o
>
> mlx5_core-$(CONFIG_MLX5_CORE_EN) += en_main.o en_common.o en_fs.o en_ethtool.o \
> - en_tx.o en_rx.o en_dim.o en_txrx.o en_accel/rxtx.o en_stats.o \
> - vxlan.o en_arfs.o en_fs_ethtool.o en_selftest.o en/port.o
> + en_tx.o en_rx.o en_dim.o en_txrx.o en_stats.o vxlan.o \
> + en_arfs.o en_fs_ethtool.o en_selftest.o en/port.o
>
> mlx5_core-$(CONFIG_MLX5_MPFS) += lib/mpfs.o
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/en_accel.h b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/en_accel.h
> index 39a5d13ba459..1dd225380a66 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/en_accel.h
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/en_accel.h
> @@ -38,14 +38,22 @@
> #include <linux/netdevice.h>
> #include "en_accel/ipsec_rxtx.h"
> #include "en_accel/tls_rxtx.h"
> -#include "en_accel/rxtx.h"
> #include "en.h"
>
> -static inline struct sk_buff *mlx5e_accel_handle_tx(struct sk_buff *skb,
> - struct mlx5e_txqsq *sq,
> - struct net_device *dev,
> - struct mlx5e_tx_wqe **wqe,
> - u16 *pi)
> +static inline void
> +mlx5e_udp_gso_handle_tx_skb(struct sk_buff *skb)
> +{
> + int payload_len = skb_shinfo(skb)->gso_size + sizeof(struct udphdr);
> +
> + udp_hdr(skb)->len = htons(payload_len);
> +}
> +
So it looks like you decided to just update the length here. Do you
still have plans to update GSO_PARTIAL to set the length this way or
have you decided to just leave it as it is?
> +static inline struct sk_buff *
> +mlx5e_accel_handle_tx(struct sk_buff *skb,
> + struct mlx5e_txqsq *sq,
> + struct net_device *dev,
> + struct mlx5e_tx_wqe **wqe,
> + u16 *pi)
> {
> #ifdef CONFIG_MLX5_EN_TLS
> if (test_bit(MLX5E_SQ_STATE_TLS, &sq->state)) {
> @@ -63,11 +71,8 @@ static inline struct sk_buff *mlx5e_accel_handle_tx(struct sk_buff *skb,
> }
> #endif
>
> - if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
> - skb = mlx5e_udp_gso_handle_tx_skb(dev, sq, skb, wqe, pi);
> - if (unlikely(!skb))
> - return NULL;
> - }
> + if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
> + mlx5e_udp_gso_handle_tx_skb(skb);
>
> return skb;
> }
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/rxtx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/rxtx.c
> deleted file mode 100644
> index 7b7ec3998e84..000000000000
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/rxtx.c
> +++ /dev/null
> @@ -1,109 +0,0 @@
> -#include "en_accel/rxtx.h"
> -
> -static void mlx5e_udp_gso_prepare_last_skb(struct sk_buff *skb,
> - struct sk_buff *nskb,
> - int remaining)
> -{
> - int bytes_needed = remaining, remaining_headlen, remaining_page_offset;
> - int headlen = skb_transport_offset(skb) + sizeof(struct udphdr);
> - int payload_len = remaining + sizeof(struct udphdr);
> - int k = 0, i, j;
> -
> - skb_copy_bits(skb, 0, nskb->data, headlen);
> - nskb->dev = skb->dev;
> - skb_reset_mac_header(nskb);
> - skb_set_network_header(nskb, skb_network_offset(skb));
> - skb_set_transport_header(nskb, skb_transport_offset(skb));
> - skb_set_tail_pointer(nskb, headlen);
> -
> - /* How many frags do we need? */
> - for (i = skb_shinfo(skb)->nr_frags - 1; i >= 0; i--) {
> - bytes_needed -= skb_frag_size(&skb_shinfo(skb)->frags[i]);
> - k++;
> - if (bytes_needed <= 0)
> - break;
> - }
> -
> - /* Fill the first frag and split it if necessary */
> - j = skb_shinfo(skb)->nr_frags - k;
> - remaining_page_offset = -bytes_needed;
> - skb_fill_page_desc(nskb, 0,
> - skb_shinfo(skb)->frags[j].page.p,
> - skb_shinfo(skb)->frags[j].page_offset + remaining_page_offset,
> - skb_shinfo(skb)->frags[j].size - remaining_page_offset);
> -
> - skb_frag_ref(skb, j);
> -
> - /* Fill the rest of the frags */
> - for (i = 1; i < k; i++) {
> - j = skb_shinfo(skb)->nr_frags - k + i;
> -
> - skb_fill_page_desc(nskb, i,
> - skb_shinfo(skb)->frags[j].page.p,
> - skb_shinfo(skb)->frags[j].page_offset,
> - skb_shinfo(skb)->frags[j].size);
> - skb_frag_ref(skb, j);
> - }
> - skb_shinfo(nskb)->nr_frags = k;
> -
> - remaining_headlen = remaining - skb->data_len;
> -
> - /* headlen contains remaining data? */
> - if (remaining_headlen > 0)
> - skb_copy_bits(skb, skb->len - remaining, nskb->data + headlen,
> - remaining_headlen);
> - nskb->len = remaining + headlen;
> - nskb->data_len = payload_len - sizeof(struct udphdr) +
> - max_t(int, 0, remaining_headlen);
> - nskb->protocol = skb->protocol;
> - if (nskb->protocol == htons(ETH_P_IP)) {
> - ip_hdr(nskb)->id = htons(ntohs(ip_hdr(nskb)->id) +
> - skb_shinfo(skb)->gso_segs);
> - ip_hdr(nskb)->tot_len =
> - htons(payload_len + sizeof(struct iphdr));
> - } else {
> - ipv6_hdr(nskb)->payload_len = htons(payload_len);
> - }
> - udp_hdr(nskb)->len = htons(payload_len);
> - skb_shinfo(nskb)->gso_size = 0;
> - nskb->ip_summed = skb->ip_summed;
> - nskb->csum_start = skb->csum_start;
> - nskb->csum_offset = skb->csum_offset;
> - nskb->queue_mapping = skb->queue_mapping;
> -}
> -
> -/* might send skbs and update wqe and pi */
> -struct sk_buff *mlx5e_udp_gso_handle_tx_skb(struct net_device *netdev,
> - struct mlx5e_txqsq *sq,
> - struct sk_buff *skb,
> - struct mlx5e_tx_wqe **wqe,
> - u16 *pi)
> -{
> - int payload_len = skb_shinfo(skb)->gso_size + sizeof(struct udphdr);
> - int headlen = skb_transport_offset(skb) + sizeof(struct udphdr);
> - int remaining = (skb->len - headlen) % skb_shinfo(skb)->gso_size;
> - struct sk_buff *nskb;
> -
> - if (skb->protocol == htons(ETH_P_IP))
> - ip_hdr(skb)->tot_len = htons(payload_len + sizeof(struct iphdr));
> - else
> - ipv6_hdr(skb)->payload_len = htons(payload_len);
> - udp_hdr(skb)->len = htons(payload_len);
> - if (!remaining)
> - return skb;
> -
> - sq->stats->udp_seg_rem++;
> - nskb = alloc_skb(max_t(int, headlen, headlen + remaining - skb->data_len), GFP_ATOMIC);
> - if (unlikely(!nskb)) {
> - sq->stats->dropped++;
> - return NULL;
> - }
> -
> - mlx5e_udp_gso_prepare_last_skb(skb, nskb, remaining);
> -
> - skb_shinfo(skb)->gso_segs--;
> - pskb_trim(skb, skb->len - remaining);
> - mlx5e_sq_xmit(sq, skb, *wqe, *pi);
> - mlx5e_sq_fetch_wqe(sq, wqe, pi);
> - return nskb;
> -}
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/rxtx.h b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/rxtx.h
> deleted file mode 100644
> index ed42699a78b3..000000000000
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/rxtx.h
> +++ /dev/null
> @@ -1,14 +0,0 @@
> -
> -#ifndef __MLX5E_EN_ACCEL_RX_TX_H__
> -#define __MLX5E_EN_ACCEL_RX_TX_H__
> -
> -#include <linux/skbuff.h>
> -#include "en.h"
> -
> -struct sk_buff *mlx5e_udp_gso_handle_tx_skb(struct net_device *netdev,
> - struct mlx5e_txqsq *sq,
> - struct sk_buff *skb,
> - struct mlx5e_tx_wqe **wqe,
> - u16 *pi);
> -
> -#endif
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> index 712b9766485f..dccde18f6170 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> @@ -4538,7 +4538,6 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
> netdev->hw_features |= NETIF_F_HW_VLAN_STAG_TX;
>
> if (mlx5e_vxlan_allowed(mdev) || MLX5_CAP_ETH(mdev, tunnel_stateless_gre)) {
> - netdev->hw_features |= NETIF_F_GSO_PARTIAL;
> netdev->hw_enc_features |= NETIF_F_IP_CSUM;
> netdev->hw_enc_features |= NETIF_F_IPV6_CSUM;
> netdev->hw_enc_features |= NETIF_F_TSO;
> @@ -4563,6 +4562,11 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
> NETIF_F_GSO_GRE_CSUM;
> }
>
> + netdev->hw_features |= NETIF_F_GSO_PARTIAL;
> + netdev->gso_partial_features |= NETIF_F_GSO_UDP_L4;
> + netdev->hw_features |= NETIF_F_GSO_UDP_L4;
> + netdev->features |= NETIF_F_GSO_UDP_L4;
> +
Isn't the setting of netdev->features going to be overwritten when you
do the "netdev->features = netdev->hw_features" assignment a little
further down in the function?
> mlx5_query_port_fcs(mdev, &fcs_supported, &fcs_enabled);
>
> if (fcs_supported)
> @@ -4595,9 +4599,6 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
> netdev->features |= NETIF_F_HIGHDMA;
> netdev->features |= NETIF_F_HW_VLAN_STAG_FILTER;
>
> - netdev->features |= NETIF_F_GSO_UDP_L4;
> - netdev->hw_features |= NETIF_F_GSO_UDP_L4;
> -
> netdev->priv_flags |= IFF_UNICAST_FLT;
>
> mlx5e_set_netdev_dev_addr(netdev);
> --
> 2.17.0
>
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