From: Stephen Hemminger <stephen@networkplumber.org>
To: bugzilla@dpdk.org
Cc: dev@dpdk.org
Subject: Re: [DPDK/ethdev Bug 1416] net/af_packet: tx_burst() can modify packets
Date: Tue, 16 Apr 2024 08:38:46 -0700 [thread overview]
Message-ID: <20240416083846.08e8dcad@hermes.local> (raw)
In-Reply-To: <bug-1416-3@http.bugs.dpdk.org/>
On Tue, 16 Apr 2024 10:29:53 +0000
bugzilla@dpdk.org wrote:
> 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;
next prev parent reply other threads:[~2024-04-16 15:38 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 [this message]
2024-04-16 15:56 ` Konstantin Ananyev
2024-04-16 16:14 ` Morten Brørup
2024-04-16 16:42 ` Konstantin Ananyev
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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