From: <hfli@netitest.com>
To: <dev@dpdk.org>
Subject: 回复: af_packet can't send packet more than framecnt
Date: Mon, 20 Mar 2023 19:36:02 +0800 [thread overview]
Message-ID: <1CCF1B14C9842CED+002501d95b20$272f1b60$758d5220$@netitest.com> (raw)
In-Reply-To:
Hi,
The issue has been resolved when I patched new code from dpdk 22.12, my dpdk
version is 19.11
Index: rte_eth_af_packet.c
===================================================================
--- rte_eth_af_packet.c (版本 44115)
+++ rte_eth_af_packet.c (版本 44128)
@@ -169,6 +169,29 @@
}
/*
+ * Check if there is an available frame in the ring
+ */
+static inline int
+tx_ring_status_available(uint32_t tp_status)
+{
+ /*
+ * We eliminate the timestamp status from the packet status.
+ * This should only matter if timestamping is enabled on the socket,
+ * but there is a bug in the kernel which is fixed in newer
releases.
+ *
+ * See the following kernel commit for reference:
+ * commit 171c3b151118a2fe0fc1e2a9d1b5a1570cfe82d2
+ * net: packetmmap: fix only tx timestamp on request
+ */
+ tp_status &= ~(TP_STATUS_TS_SOFTWARE | TP_STATUS_TS_RAW_HARDWARE);
+
+ if (tp_status == TP_STATUS_AVAILABLE)
+ return 1;
+
+ return 0;
+}
+
+/*
* Callback to handle sending packets through a real NIC.
*/
static uint16_t
@@ -213,7 +236,7 @@
}
/* point at the next incoming frame */
- if (ppd->tp_status != TP_STATUS_AVAILABLE) {
+ if (!tx_ring_status_available(ppd->tp_status)) {
if (poll(&pfd, 1, -1) < 0)
break;
@@ -236,7 +259,7 @@
*
* This results in poll() returning POLLOUT.
*/
- if (ppd->tp_status != TP_STATUS_AVAILABLE)
+ if (!tx_ring_status_available(ppd->tp_status))
break;
/* copy the tx frame data */
Thanks,
Haifeng
-----邮件原件-----
发件人: hfli@netitest.com <hfli@netitest.com>
发送时间: 2023年3月20日 11:32
收件人: 'dev@dpdk.org' <dev@dpdk.org>
主题: af_packet can't send packet more than framecnt
Hi,
I used af_packet interface, but found only can send packets successfully
less than framecnt argument.
E.g. if I pass “--vdev=eth_af_packet0,iface=tap0,blocksz=4096,framesz=2048,
framecnt=512,qpairs=1,qdisc_bypass=0” to DPDK, the rte_eth_tx_burst only
return 1 for 512 times, after that it always return 0.
If I pass
“--vdev=eth_af_packet0,iface=tap0,blocksz=4096,framesz=2048,framecnt=1024,q
pairs=1,qdisc_bypass=0” to DPDK, the rte_eth_tx_burst only return 1 for
1024 times, after that it always return 0.
BTW, I use busy loop mode in project, Is there any help for this?
Thanks so much
Haifeng
next reply other threads:[~2023-03-20 11:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-20 11:36 hfli [this message]
2023-03-20 16:53 ` Stephen Hemminger
2023-03-21 1:00 ` 回复: " hfli
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