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Date: Wed, 31 Dec 2014 11:19:20 +0200
From: Or Gerlitz <gerlitz.or@...il.com>
To: Jesse Gross <jesse@...ira.com>
Cc: David Miller <davem@...emloft.net>,
Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 1/2] net: Add Transparent Ethernet Bridging GRO support.
On Wed, Dec 31, 2014 at 5:10 AM, Jesse Gross <jesse@...ira.com> wrote:
> Currently the only tunnel protocol that supports GRO with encapsulated
> Ethernet is VXLAN. This pulls out the Ethernet code into a proper layer
> so that it can be used by other tunnel protocols such as GRE and Geneve.
Hi Jesse,
Thanks for taking care of that, I also had it coded under the
intention of adding GRO support for OVS's TEB based GRE, but didn't
make it to submit before your post... anyway, I would recommend that
you break this patch into two:
1. basic TEB GRO support
2. refactoring of the VXLAN GRO logic to use it
Or.
>
> Signed-off-by: Jesse Gross <jesse@...ira.com>
> ---
> drivers/net/vxlan.c | 53 +++-----------------------
> include/linux/etherdevice.h | 4 ++
> net/ethernet/eth.c | 92 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 102 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
> index 7fbd89f..2ab0922 100644
> --- a/drivers/net/vxlan.c
> +++ b/drivers/net/vxlan.c
> @@ -549,10 +549,7 @@ static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff
> {
> struct sk_buff *p, **pp = NULL;
> struct vxlanhdr *vh, *vh2;
> - struct ethhdr *eh, *eh2;
> - unsigned int hlen, off_vx, off_eth;
> - const struct packet_offload *ptype;
> - __be16 type;
> + unsigned int hlen, off_vx;
> int flush = 1;
>
> off_vx = skb_gro_offset(skb);
> @@ -563,17 +560,6 @@ static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff
> if (unlikely(!vh))
> goto out;
> }
> - skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
> - skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
> -
> - off_eth = skb_gro_offset(skb);
> - hlen = off_eth + sizeof(*eh);
> - eh = skb_gro_header_fast(skb, off_eth);
> - if (skb_gro_header_hard(skb, hlen)) {
> - eh = skb_gro_header_slow(skb, hlen, off_eth);
> - if (unlikely(!eh))
> - goto out;
> - }
>
> flush = 0;
>
> @@ -582,28 +568,16 @@ static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff
> continue;
>
> vh2 = (struct vxlanhdr *)(p->data + off_vx);
> - eh2 = (struct ethhdr *)(p->data + off_eth);
> - if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
> + if (vh->vx_vni != vh2->vx_vni) {
> NAPI_GRO_CB(p)->same_flow = 0;
> continue;
> }
> }
>
> - type = eh->h_proto;
> -
> - rcu_read_lock();
> - ptype = gro_find_receive_by_type(type);
> - if (ptype == NULL) {
> - flush = 1;
> - goto out_unlock;
> - }
> -
> - skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
> - skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
> - pp = ptype->callbacks.gro_receive(head, skb);
> + skb_gro_pull(skb, sizeof(struct vxlanhdr));
> + skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
> + pp = eth_gro_receive(head, skb);
>
> -out_unlock:
> - rcu_read_unlock();
> out:
> NAPI_GRO_CB(skb)->flush |= flush;
>
> @@ -612,24 +586,9 @@ out:
>
> static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
> {
> - struct ethhdr *eh;
> - struct packet_offload *ptype;
> - __be16 type;
> - int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
> - int err = -ENOSYS;
> -
> udp_tunnel_gro_complete(skb, nhoff);
>
> - eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));
> - type = eh->h_proto;
> -
> - rcu_read_lock();
> - ptype = gro_find_complete_by_type(type);
> - if (ptype != NULL)
> - err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len);
> -
> - rcu_read_unlock();
> - return err;
> + return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
> }
>
> /* Notify netdevs that UDP port started listening */
> diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
> index 41c891d..1d869d1 100644
> --- a/include/linux/etherdevice.h
> +++ b/include/linux/etherdevice.h
> @@ -52,6 +52,10 @@ struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
> #define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)
> #define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count)
>
> +struct sk_buff **eth_gro_receive(struct sk_buff **head,
> + struct sk_buff *skb);
> +int eth_gro_complete(struct sk_buff *skb, int nhoff);
> +
> /* Reserved Ethernet Addresses per IEEE 802.1Q */
> static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) =
> { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
> diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
> index 33a140e..238f38d 100644
> --- a/net/ethernet/eth.c
> +++ b/net/ethernet/eth.c
> @@ -424,3 +424,95 @@ ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
> return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr);
> }
> EXPORT_SYMBOL(sysfs_format_mac);
> +
> +struct sk_buff **eth_gro_receive(struct sk_buff **head,
> + struct sk_buff *skb)
> +{
> + struct sk_buff *p, **pp = NULL;
> + struct ethhdr *eh, *eh2;
> + unsigned int hlen, off_eth;
> + const struct packet_offload *ptype;
> + __be16 type;
> + int flush = 1;
> +
> + off_eth = skb_gro_offset(skb);
> + hlen = off_eth + sizeof(*eh);
> + eh = skb_gro_header_fast(skb, off_eth);
> + if (skb_gro_header_hard(skb, hlen)) {
> + eh = skb_gro_header_slow(skb, hlen, off_eth);
> + if (unlikely(!eh))
> + goto out;
> + }
> +
> + flush = 0;
> +
> + for (p = *head; p; p = p->next) {
> + if (!NAPI_GRO_CB(p)->same_flow)
> + continue;
> +
> + eh2 = (struct ethhdr *)(p->data + off_eth);
> + if (compare_ether_header(eh, eh2)) {
> + NAPI_GRO_CB(p)->same_flow = 0;
> + continue;
> + }
> + }
> +
> + type = eh->h_proto;
> +
> + rcu_read_lock();
> + ptype = gro_find_receive_by_type(type);
> + if (ptype == NULL) {
> + flush = 1;
> + goto out_unlock;
> + }
> +
> + skb_gro_pull(skb, sizeof(*eh));
> + skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
> + pp = ptype->callbacks.gro_receive(head, skb);
> +
> +out_unlock:
> + rcu_read_unlock();
> +out:
> + NAPI_GRO_CB(skb)->flush |= flush;
> +
> + return pp;
> +}
> +EXPORT_SYMBOL(eth_gro_receive);
> +
> +int eth_gro_complete(struct sk_buff *skb, int nhoff)
> +{
> + struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff);
> + __be16 type = eh->h_proto;
> + struct packet_offload *ptype;
> + int err = -ENOSYS;
> +
> + if (skb->encapsulation)
> + skb_set_inner_mac_header(skb, nhoff);
> +
> + rcu_read_lock();
> + ptype = gro_find_complete_by_type(type);
> + if (ptype != NULL)
> + err = ptype->callbacks.gro_complete(skb, nhoff +
> + sizeof(struct ethhdr));
> +
> + rcu_read_unlock();
> + return err;
> +}
> +EXPORT_SYMBOL(eth_gro_complete);
> +
> +static struct packet_offload eth_packet_offload __read_mostly = {
> + .type = cpu_to_be16(ETH_P_TEB),
> + .callbacks = {
> + .gro_receive = eth_gro_receive,
> + .gro_complete = eth_gro_complete,
> + },
> +};
> +
> +static int __init eth_offload_init(void)
> +{
> + dev_add_offload(ð_packet_offload);
> +
> + return 0;
> +}
> +
> +fs_initcall(eth_offload_init);
> --
> 1.9.1
>
> --
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