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Message-Id: <1430457130-16003-1-git-send-email-ast@plumgrid.com>
Date: Thu, 30 Apr 2015 22:12:10 -0700
From: Alexei Starovoitov <ast@...mgrid.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org
Subject: [PATCH v3 net-next] pktgen: introduce 'rx' mode
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 is designed to test netif_receive_skb and ingress qdisc
performace only. Make sure to understand how it works before
using it for other rx benchmarking.
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 "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
Raw netif_receive_skb speed should be ~43 million packet
per second on 3.7Ghz x86 and 'perf report' should look like:
37.69% kpktgend_0 [kernel.vmlinux] [k] __netif_receive_skb_core
25.81% kpktgend_0 [kernel.vmlinux] [k] kfree_skb
7.22% kpktgend_0 [kernel.vmlinux] [k] ip_rcv
5.68% kpktgend_0 [pktgen] [k] pktgen_thread_worker
if fib_table_lookup is seen on top, it means skb was processed
by the stack. To benchmark netif_receive_skb only make sure
that 'dst_mac' of your pktgen script is different from
receiving device mac and it will be dropped by ip_rcv
Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
---
v2->v3: addressed more Eric comments. Thanks!
v1->v2: as suggested by Eric:
- dropped 'clone_skb' flag, now it will return enotsupp
- fix rps/rfs bug by checking skb->users after every netif_receive_skb
- tested with RPS/RFS, taps, veth, physical devs, various tc cls/act
net/core/pktgen.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 47 insertions(+), 2 deletions(-)
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 508155b283dd..34fd5ece2681 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 */
@@ -1081,7 +1082,8 @@ static ssize_t pktgen_if_write(struct file *file,
if (len < 0)
return len;
if ((value > 0) &&
- (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
+ ((pkt_dev->flags & F_DO_RX) ||
+ !(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
return -ENOTSUPP;
i += len;
pkt_dev->clone_skb = value;
@@ -1089,6 +1091,12 @@ 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 +1142,7 @@ 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;
@@ -3317,6 +3325,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
unsigned int burst = ACCESS_ONCE(pkt_dev->burst);
struct net_device *odev = pkt_dev->odev;
struct netdev_queue *txq;
+ struct sk_buff *skb;
int ret;
/* If device is offline, then don't send */
@@ -3349,11 +3358,46 @@ 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) {
+ skb = pkt_dev->skb;
+ atomic_add(burst, &skb->users);
+ local_bh_disable();
+ do {
+ ret = netif_receive_skb(skb);
+ if (ret == NET_RX_DROP)
+ pkt_dev->errors++;
+ pkt_dev->sofar++;
+ pkt_dev->seq_num++;
+ if (atomic_read(&skb->users) != burst) {
+ /* skb was queued by rps/rfs or taps,
+ * so cannot reuse this skb
+ */
+ atomic_sub(burst - 1, &skb->users);
+ /* get out of the loop and wait
+ * until skb is consumed
+ */
+ pkt_dev->last_ok = 1;
+ pkt_dev->clone_skb = 0;
+ break;
+ }
+ /* skb was 'freed' by stack, so clean few
+ * bits and reuse it
+ */
+#ifdef CONFIG_NET_CLS_ACT
+ skb->tc_verd = 0; /* reset reclass/redir ttl */
+#endif
+ } while (--burst > 0);
+ goto out;
+ }
+
txq = skb_get_tx_queue(odev, pkt_dev->skb);
local_bh_disable();
@@ -3401,6 +3445,7 @@ xmit_more:
unlock:
HARD_TX_UNLOCK(odev, txq);
+out:
local_bh_enable();
/* If pkt_dev->count is zero, then run forever */
--
1.7.9.5
--
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