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Date: Mon, 14 Jul 2014 12:14:50 -0700
From: Tom Herbert <therbert@...gle.com>
To: Varka Bhadram <varkabhadram@...il.com>
Cc: David Miller <davem@...emloft.net>,
Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH 4/4] udp: Move udp_tunnel_segment into udp_offload.c
On Sun, Jul 13, 2014 at 9:53 PM, Varka Bhadram <varkabhadram@...il.com> wrote:
> 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...?
>
It's just a local variable (mac_len) so it should be inconsequential.
It's be used as an int argument in skb_gso_error_unwind and
skb_set_network_header so it's just a matter of where the implicit
cast is done.
>
>> + 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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