pktgen: add flag NO_TIMESTAMP to disable timestamping
Then testing the TX limits of the stack, then it is useful to be-able to disable the do_gettimeofday() timetamping on every packet. This implements a pktgen flag NO_TIMESTAMP which will disable this call to do_gettimeofday(). The performance change on (my system E5-2695) with skb_clone=0, goes from TX 2,423,751 pps to 2,567,165 pps with flag NO_TIMESTAMP. Thus, the cost of do_gettimeofday() or saving is approx 23 nanosec. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -202,6 +202,7 @@
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#define F_QUEUE_MAP_CPU (1<<14) /* queue map mirrors smp_processor_id() */
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#define F_NODE (1<<15) /* Node memory alloc*/
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#define F_UDPCSUM (1<<16) /* Include UDP checksum */
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#define F_NO_TIMESTAMP (1<<17) /* Don't timestamp packets (default TS) */
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/* Thread control flag bits */
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#define T_STOP (1<<0) /* Stop run */
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@ -638,6 +639,9 @@ static int pktgen_if_show(struct seq_file *seq, void *v)
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if (pkt_dev->flags & F_UDPCSUM)
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seq_puts(seq, "UDPCSUM ");
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if (pkt_dev->flags & F_NO_TIMESTAMP)
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seq_puts(seq, "NO_TIMESTAMP ");
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if (pkt_dev->flags & F_MPLS_RND)
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seq_puts(seq, "MPLS_RND ");
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@ -1243,6 +1247,9 @@ static ssize_t pktgen_if_write(struct file *file,
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else if (strcmp(f, "!UDPCSUM") == 0)
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pkt_dev->flags &= ~F_UDPCSUM;
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else if (strcmp(f, "NO_TIMESTAMP") == 0)
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pkt_dev->flags |= F_NO_TIMESTAMP;
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else {
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sprintf(pg_result,
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"Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
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@ -1251,6 +1258,7 @@ static ssize_t pktgen_if_write(struct file *file,
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"MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, "
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"MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, "
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"QUEUE_MAP_RND, QUEUE_MAP_CPU, UDPCSUM, "
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"NO_TIMESTAMP, "
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#ifdef CONFIG_XFRM
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"IPSEC, "
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#endif
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@ -2685,9 +2693,14 @@ static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
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pgh->pgh_magic = htonl(PKTGEN_MAGIC);
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pgh->seq_num = htonl(pkt_dev->seq_num);
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do_gettimeofday(×tamp);
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pgh->tv_sec = htonl(timestamp.tv_sec);
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pgh->tv_usec = htonl(timestamp.tv_usec);
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if (pkt_dev->flags & F_NO_TIMESTAMP) {
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pgh->tv_sec = 0;
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pgh->tv_usec = 0;
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} else {
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do_gettimeofday(×tamp);
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pgh->tv_sec = htonl(timestamp.tv_sec);
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pgh->tv_usec = htonl(timestamp.tv_usec);
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}
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}
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static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
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