Introduce 'RX' mode for pktgen which generates the packets
using familiar pktgen commands, but feeds them into netif_receive_skb()
instead of ndo_start_xmit().
It can be used to benchmark different kernel RX paths.
Sample script 'pktgen.sh':
!/bin/bash
function pgset() {
local result
echo $1 > $PGDEV
result=`cat $PGDEV | fgrep "Result: OK:"`
if [ "$result" = "" ]; then
cat $PGDEV | fgrep Result:
fi
}
ETH=$1
PGDEV=/proc/net/pktgen/kpktgend_0
pgset "rem_device_all"
pgset "add_device $ETH"
PGDEV=/proc/net/pktgen/$ETH
pgset "rx"
pgset "clone_skb 1000"
pgset "pkt_size 60"
pgset "dst 99.1.1.2"
pgset "dst_mac 90:e2:ba:6e:a8:e5"
pgset "count 10000000"
pgset "burst 32"
PGDEV=/proc/net/pktgen/pgctrl
echo "Running... ctrl^C to stop"
pgset "start"
echo "Done"
cat /proc/net/pktgen/$ETH
Usage:
$ sudo ./pktgen.sh eth2
...
Result: OK: 232376(c232372+d3) usec, 10000000 (60byte,0frags)
43033682pps 20656Mb/sec (20656167360bps) errors: 10000000
Signed-off-by: Alexei Starovoitov <a...@plumgrid.com>
---
net/core/pktgen.c | 30 ++++++++++++++++++++++++++++--
1 file changed, 28 insertions(+), 2 deletions(-)
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 508155b283dd..4f6c56bca550 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -203,6 +203,7 @@
#define F_NODE (1<<15) /* Node memory alloc*/
#define F_UDPCSUM (1<<16) /* Include UDP checksum */
#define F_NO_TIMESTAMP (1<<17) /* Don't timestamp packets (default TS)
*/
+#define F_DO_RX (1<<18) /* generate packets for RX */
/* Thread control flag bits */
#define T_STOP (1<<0) /* Stop run */
@@ -1080,7 +1081,7 @@ static ssize_t pktgen_if_write(struct file *file,
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0)
return len;
- if ((value > 0) &&
+ if ((value > 0) && !(pkt_dev->flags & F_DO_RX) &&
(!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
return -ENOTSUPP;
i += len;
@@ -1089,6 +1090,12 @@ static ssize_t pktgen_if_write(struct file *file,
sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb);
return count;
}
+ if (!strcmp(name, "rx")) {
+ pkt_dev->flags |= F_DO_RX;
+
+ sprintf(pg_result, "OK: RX is ON");
+ return count;
+ }
if (!strcmp(name, "count")) {
len = num_arg(&user_buffer[i], 10, &value);
if (len < 0)
@@ -1134,7 +1141,7 @@ static ssize_t pktgen_if_write(struct file *file,
return len;
i += len;
- if ((value > 1) &&
+ if ((value > 1) && !(pkt_dev->flags & F_DO_RX) &&
(!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
return -ENOTSUPP;
pkt_dev->burst = value < 1 ? 1 : value;
@@ -3349,11 +3356,29 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
pkt_dev->last_pkt_size = pkt_dev->skb->len;
pkt_dev->allocated_skbs++;
pkt_dev->clone_count = 0; /* reset counter */
+ if (pkt_dev->flags & F_DO_RX)
+ pkt_dev->skb->protocol = eth_type_trans(pkt_dev->skb,
+
pkt_dev->skb->dev);
}
if (pkt_dev->delay && pkt_dev->last_ok)
spin(pkt_dev, pkt_dev->next_tx);
+ if (pkt_dev->flags & F_DO_RX) {
+ local_bh_disable();
+ atomic_add(burst, &pkt_dev->skb->users);
+ do {
+ ret = netif_receive_skb(pkt_dev->skb);
+ if (ret == NET_RX_DROP)
+ pkt_dev->errors++;
+ pkt_dev->last_ok = 1;
+ pkt_dev->sofar++;
+ pkt_dev->seq_num++;
+ } while (--burst > 0);
+ local_bh_enable();
+ goto out;
+ }
+
txq = skb_get_tx_queue(odev, pkt_dev->skb);
local_bh_disable();
@@ -3403,6 +3428,7 @@ unlock:
local_bh_enable();
+out:
/* If pkt_dev->count is zero, then run forever */
if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) {
pktgen_wait_for_skb(pkt_dev);
--
1.7.9.5
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