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Date: Wed, 02 Jun 2010 13:49:07 +0200 From: Daniel Turull <daniel.turull@...il.com> To: netdev@...r.kernel.org CC: robert@...julf.net, jens.laas@....uu.se Subject: [PATCH 1/2] pktgen: increasing transmission granularity This patch increases the granularity of the rate generated by pktgen. The previous version of pktgen uses micro seconds (udelay) resolution when it was delayed causing gaps in the rates. It is changed to nanosecond (ndelay). Now any rate is possible. Also it allows to set, the desired rate in Mb/s or packets per second. The documentation has been updated. Signed-off-by: Daniel Turull <daniel.turull@...il.com> --- diff --git a/Documentation/networking/pktgen.txt b/Documentation/networking/pktgen.txt index 61bb645..ac0e4ff 100644 --- a/Documentation/networking/pktgen.txt +++ b/Documentation/networking/pktgen.txt @@ -78,6 +78,9 @@ Examples: pgset "delay 5000" adds delay to hard_start_xmit(). nanoseconds + pgset "rate 300M" set rate to 300 Mb/s + pgset "ratep 1000000" set rate to 1Mpps + pgset "dst 10.0.0.1" sets IP destination address (BEWARE! This generator is very aggressive!) @@ -200,6 +203,9 @@ debug frags delay +rate +ratep + src_mac_count dst_mac_count diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 2ad68da..6428653 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -169,7 +169,7 @@ #include <asm/dma.h> #include <asm/div64.h> /* do_div */ -#define VERSION "2.73" +#define VERSION "2.74" #define IP_NAME_SZ 32 #define MAX_MPLS_LABELS 16 /* This is the max label stack depth */ #define MPLS_STACK_BOTTOM htonl(0x00000100) @@ -980,6 +980,40 @@ static ssize_t pktgen_if_write(struct file *file, (unsigned long long) pkt_dev->delay); return count; } + if (!strcmp(name, "rate")) { + len = num_arg(&user_buffer[i], 10, &value); + if (len < 0) + return len; + + i += len; + if (!value) + return len; + pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value; + if (debug) + printk(KERN_INFO + "pktgen: Delay set at: %llu ns\n", + pkt_dev->delay); + + sprintf(pg_result, "OK: rate=%lu", value); + return count; + } + if (!strcmp(name, "ratep")) { + len = num_arg(&user_buffer[i], 10, &value); + if (len < 0) + return len; + + i += len; + if (!value) + return len; + pkt_dev->delay = NSEC_PER_SEC/value; + if (debug) + printk(KERN_INFO + "pktgen: Delay set at: %llu ns\n", + pkt_dev->delay); + + sprintf(pg_result, "OK: rate=%lu", value); + return count; + } if (!strcmp(name, "udp_src_min")) { len = num_arg(&user_buffer[i], 10, &value); if (len < 0) @@ -2142,15 +2176,15 @@ static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until) hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); hrtimer_set_expires(&t.timer, spin_until); - remaining = ktime_to_us(hrtimer_expires_remaining(&t.timer)); + remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer)); if (remaining <= 0) { pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay); return; } start_time = ktime_now(); - if (remaining < 100) - udelay(remaining); /* really small just spin */ + if (remaining < 100000) + ndelay(remaining); /* really small just spin */ else { /* see do_nanosleep */ hrtimer_init_sleeper(&t, current); @@ -2170,7 +2204,7 @@ static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until) end_time = ktime_now(); pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time)); - pkt_dev->next_tx = ktime_add_ns(end_time, pkt_dev->delay); + pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay); } static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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