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Date: Mon, 14 Jul 2014 10:23:59 +0530
From: Varka Bhadram <varkabhadram@...il.com>
To: Tom Herbert <therbert@...gle.com>, davem@...emloft.net,
netdev@...r.kernel.org
Subject: Re: [PATCH 4/4] udp: Move udp_tunnel_segment into udp_offload.c
On 07/14/2014 08:19 AM, Tom Herbert wrote:
> Signed-off-by: Tom Herbert <therbert@...gle.com>
> ---
> net/ipv4/udp.c | 76 --------------------------------------------------
> net/ipv4/udp_offload.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 76 insertions(+), 76 deletions(-)
>
> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
> index ac30e10..f6dfe52 100644
> --- a/net/ipv4/udp.c
> +++ b/net/ipv4/udp.c
> @@ -2522,79 +2522,3 @@ void __init udp_init(void)
> sysctl_udp_rmem_min = SK_MEM_QUANTUM;
> sysctl_udp_wmem_min = SK_MEM_QUANTUM;
> }
> -
> -struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
> - netdev_features_t features)
> -{
> - struct sk_buff *segs = ERR_PTR(-EINVAL);
> - u16 mac_offset = skb->mac_header;
> - int mac_len = skb->mac_len;
> - int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb);
> - __be16 protocol = skb->protocol;
> - netdev_features_t enc_features;
> - int udp_offset, outer_hlen;
> - unsigned int oldlen;
> - bool need_csum;
> -
> - oldlen = (u16)~skb->len;
> -
> - if (unlikely(!pskb_may_pull(skb, tnl_hlen)))
> - goto out;
> -
> - skb->encapsulation = 0;
> - __skb_pull(skb, tnl_hlen);
> - skb_reset_mac_header(skb);
> - skb_set_network_header(skb, skb_inner_network_offset(skb));
> - skb->mac_len = skb_inner_network_offset(skb);
> - skb->protocol = htons(ETH_P_TEB);
> -
> - need_csum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM);
> - if (need_csum)
> - skb->encap_hdr_csum = 1;
> -
> - /* segment inner packet. */
> - enc_features = skb->dev->hw_enc_features & netif_skb_features(skb);
> - segs = skb_mac_gso_segment(skb, enc_features);
> - if (!segs || IS_ERR(segs)) {
> - skb_gso_error_unwind(skb, protocol, tnl_hlen, mac_offset,
> - mac_len);
> - goto out;
> - }
> -
> - outer_hlen = skb_tnl_header_len(skb);
> - udp_offset = outer_hlen - tnl_hlen;
> - skb = segs;
> - do {
> - struct udphdr *uh;
> - int len;
> -
> - skb_reset_inner_headers(skb);
> - skb->encapsulation = 1;
> -
> - skb->mac_len = mac_len;
> -
> - skb_push(skb, outer_hlen);
> - skb_reset_mac_header(skb);
> - skb_set_network_header(skb, mac_len);
> - skb_set_transport_header(skb, udp_offset);
> - len = skb->len - udp_offset;
> - uh = udp_hdr(skb);
> - uh->len = htons(len);
> -
> - if (need_csum) {
> - __be32 delta = htonl(oldlen + len);
> -
> - uh->check = ~csum_fold((__force __wsum)
> - ((__force u32)uh->check +
> - (__force u32)delta));
> - uh->check = gso_make_checksum(skb, ~uh->check);
> -
> - if (uh->check == 0)
> - uh->check = CSUM_MANGLED_0;
> - }
> -
> - skb->protocol = protocol;
> - } while ((skb = skb->next));
> -out:
> - return segs;
> -}
> diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
> index 546d2d4..4807544 100644
> --- a/net/ipv4/udp_offload.c
> +++ b/net/ipv4/udp_offload.c
> @@ -47,6 +47,82 @@ static int udp4_ufo_send_check(struct sk_buff *skb)
> return 0;
> }
>
> +struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
> + netdev_features_t features)
> +{
> + struct sk_buff *segs = ERR_PTR(-EINVAL);
> + u16 mac_offset = skb->mac_header;
> + int mac_len = skb->mac_len;
skb->mac_len is u16... But we are storing in int...?
> + int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb);
> + __be16 protocol = skb->protocol;
> + netdev_features_t enc_features;
> + int udp_offset, outer_hlen;
> + unsigned int oldlen;
> + bool need_csum;
> +
> + oldlen = (u16)~skb->len;
> +
> + if (unlikely(!pskb_may_pull(skb, tnl_hlen)))
> + goto out;
> +
> + skb->encapsulation = 0;
> + __skb_pull(skb, tnl_hlen);
> + skb_reset_mac_header(skb);
> + skb_set_network_header(skb, skb_inner_network_offset(skb));
> + skb->mac_len = skb_inner_network_offset(skb);
> + skb->protocol = htons(ETH_P_TEB);
> +
> + need_csum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM);
> + if (need_csum)
> + skb->encap_hdr_csum = 1;
> +
> + /* segment inner packet. */
> + enc_features = skb->dev->hw_enc_features & netif_skb_features(skb);
> + segs = skb_mac_gso_segment(skb, enc_features);
> + if (!segs || IS_ERR(segs)) {
> + skb_gso_error_unwind(skb, protocol, tnl_hlen, mac_offset,
> + mac_len);
> + goto out;
> + }
> +
> + outer_hlen = skb_tnl_header_len(skb);
> + udp_offset = outer_hlen - tnl_hlen;
> + skb = segs;
> + do {
> + struct udphdr *uh;
> + int len;
> +
> + skb_reset_inner_headers(skb);
> + skb->encapsulation = 1;
> +
> + skb->mac_len = mac_len;
> +
> + skb_push(skb, outer_hlen);
> + skb_reset_mac_header(skb);
> + skb_set_network_header(skb, mac_len);
> + skb_set_transport_header(skb, udp_offset);
> + len = skb->len - udp_offset;
> + uh = udp_hdr(skb);
> + uh->len = htons(len);
> +
> + if (need_csum) {
> + __be32 delta = htonl(oldlen + len);
> +
> + uh->check = ~csum_fold((__force __wsum)
> + ((__force u32)uh->check +
> + (__force u32)delta));
> + uh->check = gso_make_checksum(skb, ~uh->check);
> +
> + if (uh->check == 0)
> + uh->check = CSUM_MANGLED_0;
> + }
> +
> + skb->protocol = protocol;
> + } while ((skb = skb->next));
> +out:
> + return segs;
> +}
> +
> static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
> netdev_features_t features)
> {
--
Regards,
Varka Bhadram.
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