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Date: Mon, 18 Sep 2017 17:39:03 -0700
From: Tom Herbert <tom@...ntonium.net>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, pablo@...filter.org, laforge@...monks.org,
rohit@...ntonium.net, Tom Herbert <tom@...ntonium.net>
Subject: [PATCH net-next 13/14] gtp: Support for GRO
Populate GRO receive and GRO complete functions for GTP-Uv0 and v1.
Signed-off-by: Tom Herbert <tom@...ntonium.net>
---
drivers/net/gtp.c | 204 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 204 insertions(+)
diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index b53946f8b10b..2f9d810cf19f 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -22,6 +22,7 @@
#include <linux/jhash.h>
#include <linux/if_tunnel.h>
#include <linux/net.h>
+#include <linux/netdevice.h>
#include <linux/file.h>
#include <linux/gtp.h>
@@ -429,6 +430,205 @@ static int gtp1u_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
return 1;
}
+static struct sk_buff **gtp_gro_receive_finish(struct sock *sk,
+ struct sk_buff **head,
+ struct sk_buff *skb,
+ void *hdr, size_t hdrlen)
+{
+ const struct packet_offload *ptype;
+ struct sk_buff **pp;
+ __be16 type;
+
+ type = ipver_to_eth((struct iphdr *)((void *)hdr + hdrlen));
+ if (!type)
+ goto out_err;
+
+ rcu_read_lock();
+
+ ptype = gro_find_receive_by_type(type);
+ if (!ptype)
+ goto out_unlock_err;
+
+ skb_gro_pull(skb, hdrlen);
+ skb_gro_postpull_rcsum(skb, hdr, hdrlen);
+ pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
+
+ rcu_read_unlock();
+
+ return pp;
+
+out_unlock_err:
+ rcu_read_unlock();
+out_err:
+ NAPI_GRO_CB(skb)->flush |= 1;
+ return NULL;
+}
+
+static struct sk_buff **gtp0_gro_receive(struct sock *sk,
+ struct sk_buff **head,
+ struct sk_buff *skb)
+{
+ struct gtp0_header *gtp0;
+ size_t len, hdrlen, off;
+ struct sk_buff *p;
+
+ off = skb_gro_offset(skb);
+ len = off + sizeof(*gtp0);
+ hdrlen = sizeof(*gtp0);
+
+ gtp0 = skb_gro_header_fast(skb, off);
+ if (skb_gro_header_hard(skb, len)) {
+ gtp0 = skb_gro_header_slow(skb, len, off);
+ if (unlikely(!gtp0))
+ goto out;
+ }
+
+ if ((gtp0->flags >> 5) != GTP_V0 || gtp0->type != GTP_TPDU)
+ goto out;
+
+ hdrlen += sizeof(*gtp0);
+
+ /* To get IP version */
+ len += sizeof(struct iphdr);
+
+ /* Now get header with GTP header an IPv4 header (for version) */
+ if (skb_gro_header_hard(skb, len)) {
+ gtp0 = skb_gro_header_slow(skb, len, off);
+ if (unlikely(!gtp0))
+ goto out;
+ }
+
+ for (p = *head; p; p = p->next) {
+ const struct gtp0_header *gtp0_t;
+
+ if (!NAPI_GRO_CB(p)->same_flow)
+ continue;
+
+ gtp0_t = (struct gtp0_header *)(p->data + off);
+
+ if (gtp0->flags != gtp0_t->flags ||
+ gtp0->type != gtp0_t->type ||
+ gtp0->flow != gtp0_t->flow ||
+ gtp0->tid != gtp0_t->tid) {
+ NAPI_GRO_CB(p)->same_flow = 0;
+ continue;
+ }
+ }
+
+ return gtp_gro_receive_finish(sk, head, skb, gtp0, hdrlen);
+
+out:
+ NAPI_GRO_CB(skb)->flush |= 1;
+
+ return NULL;
+}
+
+static struct sk_buff **gtp1u_gro_receive(struct sock *sk,
+ struct sk_buff **head,
+ struct sk_buff *skb)
+{
+ struct gtp1_header *gtp1;
+ size_t len, hdrlen, off;
+ struct sk_buff *p;
+
+ off = skb_gro_offset(skb);
+ len = off + sizeof(*gtp1);
+ hdrlen = sizeof(*gtp1);
+
+ gtp1 = skb_gro_header_fast(skb, off);
+ if (skb_gro_header_hard(skb, len)) {
+ gtp1 = skb_gro_header_slow(skb, len, off);
+ if (unlikely(!gtp1))
+ goto out;
+ }
+
+ if ((gtp1->flags >> 5) != GTP_V1 || gtp1->type != GTP_TPDU)
+ goto out;
+
+ if (gtp1->flags & GTP1_F_MASK) {
+ hdrlen += 4;
+ len += 4;
+ }
+
+ len += sizeof(struct iphdr);
+
+ /* Now get header with GTP header an IPv4 header (for version) */
+ if (skb_gro_header_hard(skb, len)) {
+ gtp1 = skb_gro_header_slow(skb, len, off);
+ if (unlikely(!gtp1))
+ goto out;
+ }
+
+ for (p = *head; p; p = p->next) {
+ const struct gtp1_header *gtp1_t;
+
+ if (!NAPI_GRO_CB(p)->same_flow)
+ continue;
+
+ gtp1_t = (struct gtp1_header *)(p->data + off);
+
+ if (gtp1->flags != gtp1_t->flags ||
+ gtp1->type != gtp1_t->type ||
+ gtp1->tid != gtp1_t->tid) {
+ NAPI_GRO_CB(p)->same_flow = 0;
+ continue;
+ }
+ }
+
+ return gtp_gro_receive_finish(sk, head, skb, gtp1, hdrlen);
+
+out:
+ NAPI_GRO_CB(skb)->flush = 1;
+
+ return NULL;
+}
+
+static int gtp_gro_complete_finish(struct sock *sk, struct sk_buff *skb,
+ int nhoff, size_t hdrlen)
+{
+ struct packet_offload *ptype;
+ int err = -EINVAL;
+ __be16 type;
+
+ type = ipver_to_eth((struct iphdr *)(skb->data + nhoff + hdrlen));
+ if (!type)
+ return err;
+
+ rcu_read_lock();
+ ptype = gro_find_complete_by_type(type);
+ if (ptype)
+ err = ptype->callbacks.gro_complete(skb, nhoff + hdrlen);
+
+ rcu_read_unlock();
+
+ skb_set_inner_mac_header(skb, nhoff + hdrlen);
+
+ return err;
+}
+
+static int gtp0_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
+{
+ struct gtp0_header *gtp0 = (struct gtp0_header *)(skb->data + nhoff);
+ size_t hdrlen = sizeof(struct gtp0_header);
+
+ gtp0->length = htons(skb->len - nhoff - hdrlen);
+
+ return gtp_gro_complete_finish(sk, skb, nhoff, hdrlen);
+}
+
+static int gtp1u_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
+{
+ struct gtp1_header *gtp1 = (struct gtp1_header *)(skb->data + nhoff);
+ size_t hdrlen = sizeof(struct gtp1_header);
+
+ if (gtp1->flags & GTP1_F_MASK)
+ hdrlen += 4;
+
+ gtp1->length = htons(skb->len - nhoff - hdrlen);
+
+ return gtp_gro_complete_finish(sk, skb, nhoff, hdrlen);
+}
+
static void gtp_encap_destroy(struct sock *sk)
{
struct gtp_dev *gtp;
@@ -946,9 +1146,13 @@ static int gtp_encap_enable_sock(struct socket *sock, int type,
switch (type) {
case UDP_ENCAP_GTP0:
tuncfg.encap_rcv = gtp0_udp_encap_recv;
+ tuncfg.gro_receive = gtp0_gro_receive;
+ tuncfg.gro_complete = gtp0_gro_complete;
break;
case UDP_ENCAP_GTP1U:
tuncfg.encap_rcv = gtp1u_udp_encap_recv;
+ tuncfg.gro_receive = gtp1u_gro_receive;
+ tuncfg.gro_complete = gtp1u_gro_complete;
break;
default:
pr_debug("Unknown encap type %u\n", type);
--
2.11.0
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