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* [PATCH net-next v2] pktgen: Add UDPCSUM flag to support UDP checksums
@ 2013-07-25 12:07 Thomas Graf
  2013-07-25 14:01 ` Ben Greear
  0 siblings, 1 reply; 3+ messages in thread
From: Thomas Graf @ 2013-07-25 12:07 UTC (permalink / raw)
  To: davem; +Cc: netdev, Eric Dumazet

UDP checksums are optional, hence pktgen has been omitting them in
favour of performance. The optional flag UDPCSUM enables UDP
checksumming. If the output device supports hardware checksumming
the skb is prepared and marked CHECKSUM_PARTIAL, otherwise the
checksum is generated in software.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
CC: Eric Dumazet <edumazet@google.com>
---
v2: - Add IPv6 support

 include/net/udp.h |  1 +
 net/core/pktgen.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 net/ipv4/udp.c    |  3 ++-
 3 files changed, 52 insertions(+), 6 deletions(-)

diff --git a/include/net/udp.h b/include/net/udp.h
index 74c10ec..ef2e0b7 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -183,6 +183,7 @@ extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
 			    struct msghdr *msg, size_t len);
 extern int udp_push_pending_frames(struct sock *sk);
 extern void udp_flush_pending_frames(struct sock *sk);
+extern void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst);
 extern int udp_rcv(struct sk_buff *skb);
 extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
 extern int udp_disconnect(struct sock *sk, int flags);
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 9640972..929eb7b 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -160,6 +160,7 @@
 #include <net/net_namespace.h>
 #include <net/checksum.h>
 #include <net/ipv6.h>
+#include <net/udp.h>
 #include <net/addrconf.h>
 #ifdef CONFIG_XFRM
 #include <net/xfrm.h>
@@ -198,6 +199,7 @@
 #define F_QUEUE_MAP_RND (1<<13)	/* queue map Random */
 #define F_QUEUE_MAP_CPU (1<<14)	/* queue map mirrors smp_processor_id() */
 #define F_NODE          (1<<15)	/* Node memory alloc*/
+#define F_UDPCSUM       (1<<16)	/* Include UDP checksum */
 
 /* Thread control flag bits */
 #define T_STOP        (1<<0)	/* Stop run */
@@ -631,6 +633,9 @@ static int pktgen_if_show(struct seq_file *seq, void *v)
 	if (pkt_dev->flags & F_UDPDST_RND)
 		seq_printf(seq, "UDPDST_RND  ");
 
+	if (pkt_dev->flags & F_UDPCSUM)
+		seq_printf(seq, "UDPCSUM  ");
+
 	if (pkt_dev->flags & F_MPLS_RND)
 		seq_printf(seq,  "MPLS_RND  ");
 
@@ -1228,6 +1233,9 @@ static ssize_t pktgen_if_write(struct file *file,
 		else if (strcmp(f, "!NODE_ALLOC") == 0)
 			pkt_dev->flags &= ~F_NODE;
 
+		else if (strcmp(f, "UDPCSUM") == 0)
+			pkt_dev->flags |= F_UDPCSUM;
+
 		else {
 			sprintf(pg_result,
 				"Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
@@ -2733,7 +2741,7 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
 	udph->source = htons(pkt_dev->cur_udp_src);
 	udph->dest = htons(pkt_dev->cur_udp_dst);
 	udph->len = htons(datalen + 8);	/* DATA + udphdr */
-	udph->check = 0;	/* No checksum */
+	udph->check = 0;
 
 	iph->ihl = 5;
 	iph->version = 4;
@@ -2752,6 +2760,24 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
 	skb->protocol = protocol;
 	skb->dev = odev;
 	skb->pkt_type = PACKET_HOST;
+
+	if (!(pkt_dev->flags & F_UDPCSUM)) {
+		skb->ip_summed = CHECKSUM_NONE;
+	} else if (odev->features & NETIF_F_V4_CSUM) {
+		skb->ip_summed = CHECKSUM_PARTIAL;
+		skb->csum = 0;
+		udp4_hwcsum(skb, udph->source, udph->dest);
+	} else {
+		__wsum csum = udp_csum(skb);
+
+		/* add protocol-dependent pseudo-header */
+		udph->check = csum_tcpudp_magic(udph->source, udph->dest,
+						datalen + 8, IPPROTO_UDP, csum);
+
+		if (udph->check == 0)
+			udph->check = CSUM_MANGLED_0;
+	}
+
 	pktgen_finalize_skb(pkt_dev, skb, datalen);
 
 #ifdef CONFIG_XFRM
@@ -2768,7 +2794,7 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
 	struct sk_buff *skb = NULL;
 	__u8 *eth;
 	struct udphdr *udph;
-	int datalen;
+	int datalen, udplen;
 	struct ipv6hdr *iph;
 	__be16 protocol = htons(ETH_P_IPV6);
 	__be32 *mpls;
@@ -2844,10 +2870,11 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
 		net_info_ratelimited("increased datalen to %d\n", datalen);
 	}
 
+	udplen = datalen + sizeof(struct udphdr);
 	udph->source = htons(pkt_dev->cur_udp_src);
 	udph->dest = htons(pkt_dev->cur_udp_dst);
-	udph->len = htons(datalen + sizeof(struct udphdr));
-	udph->check = 0;	/* No checksum */
+	udph->len = htons(udplen);
+	udph->check = 0;
 
 	*(__be32 *) iph = htonl(0x60000000);	/* Version + flow */
 
@@ -2858,7 +2885,7 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
 
 	iph->hop_limit = 32;
 
-	iph->payload_len = htons(sizeof(struct udphdr) + datalen);
+	iph->payload_len = htons(udplen);
 	iph->nexthdr = IPPROTO_UDP;
 
 	iph->daddr = pkt_dev->cur_in6_daddr;
@@ -2868,6 +2895,23 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
 	skb->dev = odev;
 	skb->pkt_type = PACKET_HOST;
 
+	if (!(pkt_dev->flags & F_UDPCSUM)) {
+		skb->ip_summed = CHECKSUM_NONE;
+	} else if (odev->features & NETIF_F_V6_CSUM) {
+		skb->ip_summed = CHECKSUM_PARTIAL;
+		skb->csum_start = skb_transport_header(skb) - skb->head;
+		skb->csum_offset = offsetof(struct udphdr, check);
+		udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0);
+	} else {
+		__wsum csum = udp_csum(skb);
+
+		/* add protocol-dependent pseudo-header */
+		udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum);
+
+		if (udph->check == 0)
+			udph->check = CSUM_MANGLED_0;
+	}
+
 	pktgen_finalize_skb(pkt_dev, skb, datalen);
 
 	return skb;
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 766e6ba..9e88af0 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -704,7 +704,7 @@ EXPORT_SYMBOL(udp_flush_pending_frames);
  *	@src:	source IP address
  *	@dst:	destination IP address
  */
-static void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst)
+void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst)
 {
 	struct udphdr *uh = udp_hdr(skb);
 	struct sk_buff *frags = skb_shinfo(skb)->frag_list;
@@ -740,6 +740,7 @@ static void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst)
 			uh->check = CSUM_MANGLED_0;
 	}
 }
+EXPORT_SYMBOL_GPL(udp4_hwcsum);
 
 static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4)
 {
-- 
1.8.3.1

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH net-next v2] pktgen: Add UDPCSUM flag to support UDP checksums
  2013-07-25 12:07 [PATCH net-next v2] pktgen: Add UDPCSUM flag to support UDP checksums Thomas Graf
@ 2013-07-25 14:01 ` Ben Greear
  2013-07-25 14:37   ` Thomas Graf
  0 siblings, 1 reply; 3+ messages in thread
From: Ben Greear @ 2013-07-25 14:01 UTC (permalink / raw)
  To: Thomas Graf; +Cc: davem, netdev, Eric Dumazet

On 07/25/2013 05:07 AM, Thomas Graf wrote:
> UDP checksums are optional, hence pktgen has been omitting them in
> favour of performance. The optional flag UDPCSUM enables UDP
> checksumming. If the output device supports hardware checksumming
> the skb is prepared and marked CHECKSUM_PARTIAL, otherwise the
> checksum is generated in software.
>
> Signed-off-by: Thomas Graf <tgraf@suug.ch>
> CC: Eric Dumazet <edumazet@google.com>
> ---
> v2: - Add IPv6 support
>
>   include/net/udp.h |  1 +
>   net/core/pktgen.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++-----
>   net/ipv4/udp.c    |  3 ++-
>   3 files changed, 52 insertions(+), 6 deletions(-)
>
> diff --git a/include/net/udp.h b/include/net/udp.h
> index 74c10ec..ef2e0b7 100644
> --- a/include/net/udp.h
> +++ b/include/net/udp.h
> @@ -183,6 +183,7 @@ extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
>   			    struct msghdr *msg, size_t len);
>   extern int udp_push_pending_frames(struct sock *sk);
>   extern void udp_flush_pending_frames(struct sock *sk);
> +extern void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst);
>   extern int udp_rcv(struct sk_buff *skb);
>   extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
>   extern int udp_disconnect(struct sock *sk, int flags);
> diff --git a/net/core/pktgen.c b/net/core/pktgen.c
> index 9640972..929eb7b 100644
> --- a/net/core/pktgen.c
> +++ b/net/core/pktgen.c
> @@ -160,6 +160,7 @@
>   #include <net/net_namespace.h>
>   #include <net/checksum.h>
>   #include <net/ipv6.h>
> +#include <net/udp.h>
>   #include <net/addrconf.h>
>   #ifdef CONFIG_XFRM
>   #include <net/xfrm.h>
> @@ -198,6 +199,7 @@
>   #define F_QUEUE_MAP_RND (1<<13)	/* queue map Random */
>   #define F_QUEUE_MAP_CPU (1<<14)	/* queue map mirrors smp_processor_id() */
>   #define F_NODE          (1<<15)	/* Node memory alloc*/
> +#define F_UDPCSUM       (1<<16)	/* Include UDP checksum */
>
>   /* Thread control flag bits */
>   #define T_STOP        (1<<0)	/* Stop run */
> @@ -631,6 +633,9 @@ static int pktgen_if_show(struct seq_file *seq, void *v)
>   	if (pkt_dev->flags & F_UDPDST_RND)
>   		seq_printf(seq, "UDPDST_RND  ");
>
> +	if (pkt_dev->flags & F_UDPCSUM)
> +		seq_printf(seq, "UDPCSUM  ");
> +
>   	if (pkt_dev->flags & F_MPLS_RND)
>   		seq_printf(seq,  "MPLS_RND  ");
>
> @@ -1228,6 +1233,9 @@ static ssize_t pktgen_if_write(struct file *file,
>   		else if (strcmp(f, "!NODE_ALLOC") == 0)
>   			pkt_dev->flags &= ~F_NODE;
>
> +		else if (strcmp(f, "UDPCSUM") == 0)
> +			pkt_dev->flags |= F_UDPCSUM;
> +

Looks like we need a way to turn it back off again too??

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH net-next v2] pktgen: Add UDPCSUM flag to support UDP checksums
  2013-07-25 14:01 ` Ben Greear
@ 2013-07-25 14:37   ` Thomas Graf
  0 siblings, 0 replies; 3+ messages in thread
From: Thomas Graf @ 2013-07-25 14:37 UTC (permalink / raw)
  To: Ben Greear; +Cc: davem, netdev, Eric Dumazet

On 07/25/13 at 07:01am, Ben Greear wrote:
> >+		else if (strcmp(f, "UDPCSUM") == 0)
> >+			pkt_dev->flags |= F_UDPCSUM;
> >+
> 
> Looks like we need a way to turn it back off again too??

Yes, good point. Although you would typically want to start
with fresh devices to make sure you have a default set of
flags set.

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2013-07-25 14:37 UTC | newest]

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2013-07-25 12:07 [PATCH net-next v2] pktgen: Add UDPCSUM flag to support UDP checksums Thomas Graf
2013-07-25 14:01 ` Ben Greear
2013-07-25 14:37   ` Thomas Graf

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