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net: pktgen: support injecting packets for qdisc testing

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Add another xmit_mode to pktgen to allow testing xmit functionality
of qdiscs. The new mode "queue_xmit" injects packets at
__dev_queue_xmit() so that qdisc is called.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend 2016-07-02 14:12:54 -07:00 committed by David S. Miller
parent 4386f5662e
commit 0967f24459
1 changed files with 40 additions and 2 deletions
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42
net/core/pktgen.c
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@ -213,6 +213,7 @@
/* Xmit modes */
#define M_START_XMIT 0 /* Default normal TX */
#define M_NETIF_RECEIVE 1 /* Inject packets into stack */
#define M_QUEUE_XMIT 2 /* Inject packet into qdisc */
/* If lock -- protects updating of if_list */
#define if_lock(t) spin_lock(&(t->if_lock));
@ -626,6 +627,8 @@ static int pktgen_if_show(struct seq_file *seq, void *v)
if (pkt_dev->xmit_mode == M_NETIF_RECEIVE)
seq_puts(seq, " xmit_mode: netif_receive\n");
else if (pkt_dev->xmit_mode == M_QUEUE_XMIT)
seq_puts(seq, " xmit_mode: xmit_queue\n");
seq_puts(seq, " Flags: ");
@ -1142,8 +1145,10 @@ static ssize_t pktgen_if_write(struct file *file,
return len;
i += len;
if ((value > 1) && (pkt_dev->xmit_mode == M_START_XMIT) &&
(!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
if ((value > 1) &&
((pkt_dev->xmit_mode == M_QUEUE_XMIT) ||
((pkt_dev->xmit_mode == M_START_XMIT) &&
(!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))))
return -ENOTSUPP;
pkt_dev->burst = value < 1 ? 1 : value;
sprintf(pg_result, "OK: burst=%d", pkt_dev->burst);
@ -1198,6 +1203,9 @@ static ssize_t pktgen_if_write(struct file *file,
* at module loading time
*/
pkt_dev->clone_skb = 0;
} else if (strcmp(f, "queue_xmit") == 0) {
pkt_dev->xmit_mode = M_QUEUE_XMIT;
pkt_dev->last_ok = 1;
} else {
sprintf(pg_result,
"xmit_mode -:%s:- unknown\nAvailable modes: %s",
@ -3434,6 +3442,36 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
#endif
} while (--burst > 0);
goto out; /* Skips xmit_mode M_START_XMIT */
} else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) {
local_bh_disable();
atomic_inc(&pkt_dev->skb->users);
ret = dev_queue_xmit(pkt_dev->skb);
switch (ret) {
case NET_XMIT_SUCCESS:
pkt_dev->sofar++;
pkt_dev->seq_num++;
pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
break;
case NET_XMIT_DROP:
case NET_XMIT_CN:
/* These are all valid return codes for a qdisc but
* indicate packets are being dropped or will likely
* be dropped soon.
*/
case NETDEV_TX_BUSY:
/* qdisc may call dev_hard_start_xmit directly in cases
* where no queues exist e.g. loopback device, virtual
* devices, etc. In this case we need to handle
* NETDEV_TX_ codes.
*/
default:
pkt_dev->errors++;
net_info_ratelimited("%s xmit error: %d\n",
pkt_dev->odevname, ret);
break;
}
goto out;
}
txq = skb_get_tx_queue(odev, pkt_dev->skb);