From: Stephen Hemminger <stephen@networkplumber.org>
To: Ferruh Yigit <ferruh.yigit@amd.com>
Cc: longli@microsoft.com,
Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
dev@dpdk.org
Subject: Re: [Patch v2] net/mana: use rte_pktmbuf_alloc_bulk for allocating RX WQEs
Date: Tue, 30 Jan 2024 08:43:52 -0800 [thread overview]
Message-ID: <20240130084352.56971000@hermes.local> (raw)
In-Reply-To: <b49e8410-5cae-4535-90d4-b4a462d2161b@amd.com>
On Tue, 30 Jan 2024 10:19:32 +0000
Ferruh Yigit <ferruh.yigit@amd.com> wrote:
> > -mana_alloc_and_post_rx_wqes(struct mana_rxq *rxq)
> > +mana_alloc_and_post_rx_wqes(struct mana_rxq *rxq, uint32_t count)
> > {
> > int ret;
> > uint32_t i;
> > + struct rte_mbuf **mbufs;
> > +
> > + mbufs = rte_calloc_socket("mana_rx_mbufs", count, sizeof(struct rte_mbuf *),
> > + 0, rxq->mp->socket_id);
> > + if (!mbufs)
> > + return -ENOMEM;
> >
>
> 'mbufs' is temporarily storage for allocated mbuf pointers, why not
> allocate if from stack instead, can be faster and easier to manage:
> "struct rte_mbuf *mbufs[count]"
That would introduce a variable length array.
VLA's should be removed, they are not supported on Windows and many
security tools flag them. The problem is that it makes the code brittle
if count gets huge.
But certainly regular calloc() or alloca() would work here.
next prev parent reply other threads:[~2024-01-30 16:44 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-25 2:42 [PATCH] " longli
2024-01-26 0:29 ` Stephen Hemminger
2024-01-26 1:13 ` Long Li
2024-01-30 1:13 ` [Patch v2] " longli
2024-01-30 10:19 ` Ferruh Yigit
2024-01-30 16:43 ` Stephen Hemminger [this message]
2024-01-30 18:05 ` Tyler Retzlaff
2024-01-30 22:42 ` Ferruh Yigit
2024-02-01 3:55 ` Long Li
2024-02-01 10:52 ` Ferruh Yigit
2024-02-02 1:21 ` Long Li
2024-02-01 16:33 ` Tyler Retzlaff
2024-02-02 1:22 ` Long Li
2024-01-30 21:30 ` Long Li
2024-01-30 22:34 ` Ferruh Yigit
2024-01-30 22:36 ` Long Li
2024-02-01 3:45 ` [Patch v3] " longli
2024-02-01 16:16 ` Tyler Retzlaff
2024-02-01 19:41 ` Long Li
2024-02-02 1:19 ` [Patch v4] net/mana: use rte_pktmbuf_alloc_bulk for allocating RX mbufs longli
2024-02-02 16:24 ` Stephen Hemminger
2024-02-06 18:06 ` Ferruh Yigit
2024-02-07 4:50 ` Long Li
2024-02-09 0:02 ` [Patch v5] net/mana: use rte_pktmbuf_alloc_bulk for allocating RX WQEs longli
2024-02-09 17:46 ` Ferruh Yigit
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