From: Konstantin Ananyev <konstantin.ananyev@huawei.com>
To: "Morten Brørup" <mb@smartsharesystems.com>,
"Stephen Hemminger" <stephen@networkplumber.org>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: RE: [DPDK/ethdev Bug 1416] net/af_packet: tx_burst() can modify packets
Date: Tue, 16 Apr 2024 16:42:01 +0000 [thread overview]
Message-ID: <e1b534c426f74273b891ac96f2d85e8f@huawei.com> (raw)
In-Reply-To: <98CBD80474FA8B44BF855DF32C47DC35E9F3A9@smartserver.smartshare.dk>
> > > > static uint16_t
> > > > eth_af_packet_tx(void *queue, struct rte_mbuf **bufs, uint16_t
> > nb_pkts)
> > > > {
> > > > ...
> > > > for (i = 0; i < nb_pkts; i++) {
> > > > mbuf = *bufs++;
> > > >
> > > > ...
> > > >
> > > > /* insert vlan info if necessary */
> > > > if (mbuf->ol_flags & RTE_MBUF_F_TX_VLAN) {
> > > > if (rte_vlan_insert(&mbuf)) {
> > > > rte_pktmbuf_free(mbuf);
> > > > continue;
> > > >
> > > > AFAIU, it does copy of mbuf contents into pbuf anyway (just few line
> > below).
> > > > So the fix might be - simply insert VLAN tag at copying stage.
> > > > Feel free to correct me, if I missed something.
> > >
> > > vlan_insert will fail if the mbuf is has refcnt > 1.
> > >
> > > static inline int rte_vlan_insert(struct rte_mbuf **m)
> > > {
> > > struct rte_ether_hdr *oh, *nh;
> > > struct rte_vlan_hdr *vh;
> > >
> > > /* Can't insert header if mbuf is shared */
> > > if (!RTE_MBUF_DIRECT(*m) || rte_mbuf_refcnt_read(*m) > 1)
> > > return -EINVAL;
> >
> > You are right, I missed that.
> > Will close it then.
>
> Don't close, silent drop is also a bug.
>
> The VLAN tag could be insert when copying, as originally suggested.
Agree, but to me that would be enhancement request, not a bug report.
>
> Alternatively, set tpacket2_hdr's tp_vlan_tci and tp_vlan_tpid fields and set TP_STATUS_VLAN_VALID and
> TP_STATUS_VLAN_TPID_VALID flags in tp_status. If the kernel reads those?
next prev parent reply other threads:[~2024-04-16 16:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-16 10:29 [DPDK/ethdev Bug 1416] net/af_packet: tx_burst() can modify packets bugzilla
2024-04-16 15:38 ` Stephen Hemminger
2024-04-16 15:56 ` Konstantin Ananyev
2024-04-16 16:14 ` Morten Brørup
2024-04-16 16:42 ` Konstantin Ananyev [this message]
2024-04-16 18:11 ` Morten Brørup
2024-04-16 20:09 ` Stephen Hemminger
2024-04-16 22:21 ` Morten Brørup
2024-04-16 15:58 ` bugzilla
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