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Message-ID: <CA+mtBx-AvGkUAxq69pTFWoyiM1pdktofEz+o+hCDw=7SWjWtpQ@mail.gmail.com>
Date: Thu, 30 Oct 2014 16:59:06 -0700
From: Tom Herbert <therbert@...gle.com>
To: Or Gerlitz <ogerlitz@...lanox.com>
Cc: "David S. Miller" <davem@...emloft.net>,
Linux Netdev List <netdev@...r.kernel.org>,
Matan Barak <matanb@...lanox.com>,
Amir Vadai <amirv@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>,
Shani Michaeli <shanim@...lanox.com>,
Jerry Chu <hkchu@...gle.com>
Subject: Re: [PATCH net-next 8/8] net/mlx4_en: Extend checksum offloading by
CHECKSUM COMPLETE
On Thu, Oct 30, 2014 at 9:06 AM, Or Gerlitz <ogerlitz@...lanox.com> wrote:
> From: Shani Michaeli <shanim@...lanox.com>
>
> When processing received traffic, pass CHECKSUM_COMPLETE status to the
> stack, with calculated checksum for non TCP/UDP packets (such
> as GRE or ICMP).
>
Hi Or,
This is very exciting work! One question though, what would mlx4
return in the case of a zero UDP checksum? (I assume this patch won't
affect this case but would like to make sure).
Thanks,
Tom
> Although the stack expects checksum which doesn't include the pseudo
> header, the HW adds it. To address that, we are subtracting the pseudo
> header checksum from the checksum value provided by the HW.
>
> In the IPv6 case, we also compute/add the IP header checksum which
> is not added by the HW for such packets.
>
> Cc: Jerry Chu <hkchu@...gle.com>
> Signed-off-by: Shani Michaeli <shanim@...lanox.com>
> Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
> ---
> drivers/net/ethernet/mellanox/mlx4/en_ethtool.c | 2 +-
> drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 5 +
> drivers/net/ethernet/mellanox/mlx4/en_port.c | 2 +
> drivers/net/ethernet/mellanox/mlx4/en_rx.c | 116 +++++++++++++++++++++-
> drivers/net/ethernet/mellanox/mlx4/main.c | 9 ++
> drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 5 +-
> include/linux/mlx4/device.h | 1 +
> 7 files changed, 132 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
> index 8ea4d5b..6c64323 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
> @@ -115,7 +115,7 @@ static const char main_strings[][ETH_GSTRING_LEN] = {
> "tso_packets",
> "xmit_more",
> "queue_stopped", "wake_queue", "tx_timeout", "rx_alloc_failed",
> - "rx_csum_good", "rx_csum_none", "tx_chksum_offload",
> + "rx_csum_good", "rx_csum_none", "rx_csum_complete", "tx_chksum_offload",
>
> /* packet statistics */
> "broadcast", "rx_prio_0", "rx_prio_1", "rx_prio_2", "rx_prio_3",
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> index 0efbae9..d1eb25d 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> @@ -1893,6 +1893,7 @@ static void mlx4_en_clear_stats(struct net_device *dev)
> priv->rx_ring[i]->packets = 0;
> priv->rx_ring[i]->csum_ok = 0;
> priv->rx_ring[i]->csum_none = 0;
> + priv->rx_ring[i]->csum_complete = 0;
> }
> }
>
> @@ -2503,6 +2504,10 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
> /* Query for default mac and max mtu */
> priv->max_mtu = mdev->dev->caps.eth_mtu_cap[priv->port];
>
> + if (mdev->dev->caps.rx_checksum_flags_port[priv->port] &
> + MLX4_RX_CSUM_MODE_VAL_NON_TCP_UDP)
> + priv->flags |= MLX4_EN_FLAG_RX_CSUM_NON_TCP_UDP;
> +
> /* Set default MAC */
> dev->addr_len = ETH_ALEN;
> mlx4_en_u64_to_mac(dev->dev_addr, mdev->dev->caps.def_mac[priv->port]);
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_port.c b/drivers/net/ethernet/mellanox/mlx4/en_port.c
> index 134b12e..6cb8007 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_port.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_port.c
> @@ -155,11 +155,13 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset)
> stats->rx_bytes = 0;
> priv->port_stats.rx_chksum_good = 0;
> priv->port_stats.rx_chksum_none = 0;
> + priv->port_stats.rx_chksum_complete = 0;
> for (i = 0; i < priv->rx_ring_num; i++) {
> stats->rx_packets += priv->rx_ring[i]->packets;
> stats->rx_bytes += priv->rx_ring[i]->bytes;
> priv->port_stats.rx_chksum_good += priv->rx_ring[i]->csum_ok;
> priv->port_stats.rx_chksum_none += priv->rx_ring[i]->csum_none;
> + priv->port_stats.rx_chksum_complete += priv->rx_ring[i]->csum_complete;
> }
> stats->tx_packets = 0;
> stats->tx_bytes = 0;
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> index 2a29a1a..f8a0449 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> @@ -42,6 +42,10 @@
> #include <linux/vmalloc.h>
> #include <linux/irq.h>
>
> +#if IS_ENABLED(CONFIG_IPV6)
> +#include <net/ip6_checksum.h>
> +#endif
> +
> #include "mlx4_en.h"
>
> static int mlx4_alloc_pages(struct mlx4_en_priv *priv,
> @@ -642,6 +646,86 @@ static void mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv,
> }
> }
>
> +/* When hardware doesn't strip the vlan, we need to calculate the checksum
> + * over it and add it to the hardware's checksum calculation
> + */
> +static inline __wsum get_fixed_vlan_csum(__wsum hw_checksum,
> + struct vlan_hdr *vlanh)
> +{
> + return csum_add(hw_checksum, *(__wsum *)vlanh);
> +}
> +
> +/* Although the stack expects checksum which doesn't include the pseudo
> + * header, the HW adds it. To address that, we are subtracting the pseudo
> + * header checksum from the checksum value provided by the HW.
> + */
> +static void get_fixed_ipv4_csum(__wsum hw_checksum, struct sk_buff *skb,
> + struct iphdr *iph)
> +{
> + __u16 length_for_csum = 0;
> + __wsum csum_pseudo_header = 0;
> +
> + length_for_csum = (be16_to_cpu(iph->tot_len) - (iph->ihl << 2));
> + csum_pseudo_header = csum_tcpudp_nofold(iph->saddr, iph->daddr,
> + length_for_csum, iph->protocol, 0);
> + skb->csum = csum_sub(hw_checksum, csum_pseudo_header);
> +}
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +/* In IPv6 packets, besides subtracting the pseudo header checksum,
> + * we also compute/add the IP header checksum which
> + * is not added by the HW.
> + */
> +static int get_fixed_ipv6_csum(__wsum hw_checksum, struct sk_buff *skb,
> + struct ipv6hdr *ipv6h)
> +{
> + __wsum csum_pseudo_header = 0;
> +
> + if (ipv6h->nexthdr == IPPROTO_FRAGMENT || ipv6h->nexthdr == IPPROTO_HOPOPTS)
> + return -1;
> + hw_checksum = csum_add(hw_checksum, (__force __wsum)(ipv6h->nexthdr << 8));
> +
> + csum_pseudo_header = csum_ipv6_magic_nofold(&ipv6h->saddr,
> + &ipv6h->daddr,
> + ntohs(ipv6h->payload_len),
> + ipv6h->nexthdr,
> + 0);
> + skb->csum = csum_sub(hw_checksum, csum_pseudo_header);
> + skb->csum = csum_add(skb->csum, csum_partial(ipv6h, sizeof(struct ipv6hdr), 0));
> + return 0;
> +}
> +#endif
> +
> +static int check_csum(struct mlx4_cqe *cqe, struct sk_buff *skb, int hwtstamp_rx_filter)
> +{
> + __wsum hw_checksum = 0;
> +
> + void *hdr = (u8 *)skb->data + sizeof(struct ethhdr);
> +
> + hw_checksum = csum_unfold((__force __sum16)cqe->checksum);
> +
> + if (((struct ethhdr *)skb->data)->h_proto == htons(ETH_P_8021Q) &&
> + hwtstamp_rx_filter != HWTSTAMP_FILTER_NONE) {
> + /* next protocol non IPv4 or IPv6 */
> + if (((struct vlan_hdr *)hdr)->h_vlan_encapsulated_proto
> + != htons(ETH_P_IP) ||
> + ((struct vlan_hdr *)hdr)->h_vlan_encapsulated_proto
> + != htons(ETH_P_IPV6))
> + return -1;
> + hw_checksum = get_fixed_vlan_csum(hw_checksum, hdr);
> + hdr += sizeof(struct vlan_hdr);
> + }
> +
> + if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPV4))
> + get_fixed_ipv4_csum(hw_checksum, skb, hdr);
> +#if IS_ENABLED(CONFIG_IPV6)
> + else if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPV6))
> + if (get_fixed_ipv6_csum(hw_checksum, skb, hdr))
> + return -1;
> +#endif
> + return 0;
> +}
> +
> int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
> {
> struct mlx4_en_priv *priv = netdev_priv(dev);
> @@ -743,13 +827,26 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
> (cqe->vlan_my_qpn & cpu_to_be32(MLX4_CQE_L2_TUNNEL));
>
> if (likely(dev->features & NETIF_F_RXCSUM)) {
> - if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
> - (cqe->checksum == cpu_to_be16(0xffff))) {
> - ring->csum_ok++;
> - ip_summed = CHECKSUM_UNNECESSARY;
> + if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_TCP |
> + MLX4_CQE_STATUS_UDP)) {
> + if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
> + cqe->checksum == cpu_to_be16(0xffff)) {
> + ip_summed = CHECKSUM_UNNECESSARY;
> + ring->csum_ok++;
> + } else {
> + ip_summed = CHECKSUM_NONE;
> + ring->csum_none++;
> + }
> } else {
> - ip_summed = CHECKSUM_NONE;
> - ring->csum_none++;
> + if (priv->flags & MLX4_EN_FLAG_RX_CSUM_NON_TCP_UDP &&
> + (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPV4 |
> + MLX4_CQE_STATUS_IPV6))) {
> + ip_summed = CHECKSUM_COMPLETE;
> + ring->csum_complete++;
> + } else {
> + ip_summed = CHECKSUM_NONE;
> + ring->csum_none++;
> + }
> }
> } else {
> ip_summed = CHECKSUM_NONE;
> @@ -767,6 +864,13 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
> goto next;
> }
>
> + if (ip_summed == CHECKSUM_COMPLETE) {
> + if (check_csum(cqe, skb, ring->hwtstamp_rx_filter)) {
> + ip_summed = CHECKSUM_NONE;
> + ring->csum_none++;
> + }
> + }
> +
> skb->ip_summed = ip_summed;
> skb->protocol = eth_type_trans(skb, dev);
> skb_record_rx_queue(skb, cq->ring);
> diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
> index 9f82196..2f6ba42 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/main.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/main.c
> @@ -1629,6 +1629,7 @@ static int mlx4_init_hca(struct mlx4_dev *dev)
> struct mlx4_init_hca_param init_hca;
> u64 icm_size;
> int err;
> + struct mlx4_config_dev_params params;
>
> if (!mlx4_is_slave(dev)) {
> err = mlx4_QUERY_FW(dev);
> @@ -1762,6 +1763,14 @@ static int mlx4_init_hca(struct mlx4_dev *dev)
> goto unmap_bf;
> }
>
> + /* Query CONFIG_DEV parameters */
> + err = mlx4_config_dev_retrieval(dev, ¶ms);
> + if (err && err != -ENOTSUPP) {
> + mlx4_err(dev, "Failed to query CONFIG_DEV parameters\n");
> + } else if (!err) {
> + dev->caps.rx_checksum_flags_port[1] = params.rx_csum_flags_port_1;
> + dev->caps.rx_checksum_flags_port[2] = params.rx_csum_flags_port_2;
> + }
> priv->eq_table.inta_pin = adapter.inta_pin;
> memcpy(dev->board_id, adapter.board_id, sizeof dev->board_id);
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> index ef83d12..de45674 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> @@ -326,6 +326,7 @@ struct mlx4_en_rx_ring {
> #endif
> unsigned long csum_ok;
> unsigned long csum_none;
> + unsigned long csum_complete;
> int hwtstamp_rx_filter;
> cpumask_var_t affinity_mask;
> };
> @@ -449,6 +450,7 @@ struct mlx4_en_port_stats {
> unsigned long rx_alloc_failed;
> unsigned long rx_chksum_good;
> unsigned long rx_chksum_none;
> + unsigned long rx_chksum_complete;
> unsigned long tx_chksum_offload;
> #define NUM_PORT_STATS 9
> };
> @@ -507,7 +509,8 @@ enum {
> MLX4_EN_FLAG_ENABLE_HW_LOOPBACK = (1 << 2),
> /* whether we need to drop packets that hardware loopback-ed */
> MLX4_EN_FLAG_RX_FILTER_NEEDED = (1 << 3),
> - MLX4_EN_FLAG_FORCE_PROMISC = (1 << 4)
> + MLX4_EN_FLAG_FORCE_PROMISC = (1 << 4),
> + MLX4_EN_FLAG_RX_CSUM_NON_TCP_UDP = (1 << 5),
> };
>
> #define MLX4_EN_MAC_HASH_SIZE (1 << BITS_PER_BYTE)
> diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
> index 5cc5eac..3d9bff0 100644
> --- a/include/linux/mlx4/device.h
> +++ b/include/linux/mlx4/device.h
> @@ -497,6 +497,7 @@ struct mlx4_caps {
> u16 hca_core_clock;
> u64 phys_port_id[MLX4_MAX_PORTS + 1];
> int tunnel_offload_mode;
> + u8 rx_checksum_flags_port[MLX4_MAX_PORTS + 1];
> };
>
> struct mlx4_buf_list {
> --
> 1.7.1
>
> --
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