From: Andreas Schultz <aschultz@tpip.net>
To: Pablo Neira <pablo@netfilter.org>
Cc: netdev@vger.kernel.org, Harald Welte <laforge@gnumonks.org>,
Lionel Gauthier <Lionel.Gauthier@eurecom.fr>,
openbsc@lists.osmocom.org
Subject: [PATCH 07/17] gtp: remove unnecessary rcu_read_lock
Date: Mon, 23 Jan 2017 12:56:56 +0100 [thread overview]
Message-ID: <20170123115706.4354-8-aschultz@tpip.net> (raw)
In-Reply-To: <20170123115706.4354-1-aschultz@tpip.net>
The rcu read lock is hold by default in the ip input path. There
is no need to hold it twice in the socket recv decapsulate code path.
Signed-off-by: Andreas Schultz <aschultz@tpip.net>
---
drivers/net/gtp.c | 24 ++++--------------------
1 file changed, 4 insertions(+), 20 deletions(-)
diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index bc8734b7..f434f84 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -183,7 +183,6 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
sizeof(struct gtp0_header);
struct gtp0_header *gtp0;
struct pdp_ctx *pctx;
- int ret = 0;
if (!pskb_may_pull(skb, hdrlen))
return -1;
@@ -196,26 +195,19 @@ static int gtp0_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
if (gtp0->type != GTP_TPDU)
return 1;
- rcu_read_lock();
pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));
if (IS_ERR(pctx)) {
netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
- ret = -1;
- goto out_rcu;
+ return -1;
}
if (!gtp_check_src_ms(skb, pctx, hdrlen)) {
netdev_dbg(gtp->dev, "No PDP ctx for this MS\n");
- ret = -1;
- goto out_rcu;
+ return -1;
}
- rcu_read_unlock();
/* Get rid of the GTP + UDP headers. */
return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet);
-out_rcu:
- rcu_read_unlock();
- return ret;
}
static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
@@ -225,7 +217,6 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
sizeof(struct gtp1_header);
struct gtp1_header *gtp1;
struct pdp_ctx *pctx;
- int ret = 0;
if (!pskb_may_pull(skb, hdrlen))
return -1;
@@ -253,26 +244,19 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
- rcu_read_lock();
pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
if (IS_ERR(pctx)) {
netdev_dbg(gtp->dev, "No PDP ctx to decap skb=%p\n", skb);
- ret = -1;
- goto out_rcu;
+ return -1;
}
if (!gtp_check_src_ms(skb, pctx, hdrlen)) {
netdev_dbg(gtp->dev, "No PDP ctx for this MS\n");
- ret = -1;
- goto out_rcu;
+ return -1;
}
- rcu_read_unlock();
/* Get rid of the GTP + UDP headers. */
return iptunnel_pull_header(skb, hdrlen, skb->protocol, xnet);
-out_rcu:
- rcu_read_unlock();
- return ret;
}
/* UDP encapsulation receive handler. See net/ipv4/udp.c.
--
2.10.2
next prev parent reply other threads:[~2017-01-23 12:06 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-23 11:56 [PATCH 00/17] gtp: fixes and support multiple VRF's per GTP socket Andreas Schultz
2017-01-23 11:56 ` [PATCH 01/17] gtp: add genl family modules alias Andreas Schultz
2017-01-23 11:56 ` [PATCH 02/17] gtp: clear DF bit on GTP packet tx Andreas Schultz
2017-01-23 11:56 ` [PATCH 03/17] gtp: make GTP sockets in gtp_newlink optional Andreas Schultz
2017-01-23 11:56 ` [PATCH 04/17] gtp: return error ptr in find pdp helpers Andreas Schultz
2017-01-23 11:56 ` [PATCH 05/17] gtp: unify genl_find_pdp and prepare for per socket lookup Andreas Schultz
2017-01-23 11:56 ` [PATCH 06/17] gtp: fix cross netns recv on gtp socket Andreas Schultz
2017-01-23 11:56 ` Andreas Schultz [this message]
2017-01-23 11:56 ` [PATCH 08/17] gtp: consolidate pdp context destruction into helper Andreas Schultz
2017-01-23 11:56 ` [PATCH 09/17] gtp: use addr_hash when traversing pdp contexts Andreas Schultz
2017-01-23 11:56 ` [PATCH 10/17] gtp: add socket to pdp context Andreas Schultz
2017-01-23 11:57 ` [PATCH 11/17] gtp: consolidate gtp socket rx path Andreas Schultz
2017-01-23 11:57 ` [PATCH 12/17] gtp: let userspace handle packets for invalid tunnels Andreas Schultz
2017-01-23 11:57 ` [PATCH 13/17] gtp: replace netdev_dbg and KERN_DEBUG printk with pr_debug Andreas Schultz
2017-01-23 11:57 ` [PATCH 14/17] gtp: move TEID hash to per socket structure Andreas Schultz
2017-01-23 11:57 ` [PATCH 15/17] gtp: rename gtp hashtable helpers Andreas Schultz
2017-01-23 11:57 ` [PATCH 16/17] gtp: add genl cmd to enable GTP encapsulation on UDP socket Andreas Schultz
2017-01-23 11:57 ` [PATCH 17/17] gtp: add support to select a GTP socket during PDP context creation Andreas Schultz
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