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References: <20200131170201.3236153-1-jerinj@marvell.com>
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<20200202023523.2f160b4e@shemminger-XPS-13-9360>
In-Reply-To: <20200202023523.2f160b4e@shemminger-XPS-13-9360>
From: Jerin Jacob <jerinjacobk@gmail.com>
Date: Sun, 2 Feb 2020 16:38:55 +0530
Message-ID: <CALBAE1NGiz_R1ZdwEXixW0Pg=_PEbGxsUUM4MX4KcS6ufLoFbg@mail.gmail.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: Jerin Jacob <jerinj@marvell.com>, dpdk-dev <dev@dpdk.org>,
Prasun Kapoor <pkapoor@marvell.com>,
Nithin Dabilpuram <ndabilpuram@marvell.com>,
Kiran Kumar K <kirankumark@marvell.com>,
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Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>,
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Content-Type: text/plain; charset="UTF-8"
Subject: Re: [dpdk-dev] [RFC PATCH 1/5] graph: introduce graph subsystem
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On Sun, Feb 2, 2020 at 4:05 PM Stephen Hemminger
<stephen@networkplumber.org> wrote:
>
> On Fri, 31 Jan 2020 22:31:57 +0530
> <jerinj@marvell.com> wrote:
>
> > + /* Create graph object */
> > + graph = calloc(1, sizeof(*graph));
> > + if (graph == NULL)
> > + set_err(ENOMEM, fail, "failed to calloc graph object");
>
> This won't be safe if used in primary/secondary process model.
> You would need to use rte_calloc etc to allow this.
That memory used only local housekeeping purposes. Down in the
function, it creates a graph reel from
the memzone with all the required data for fast path. see graph_fp_mem_create()
workers/secondary process get the real fast path graph object through
rte_graph_lookup() which
returns the "struct rte_graph *". Followed by invoking
rte_graph_walk(struct rte_graph *graph)
for the graph walk.
struct rte_graph *
rte_graph_lookup(const char *name)
{
const struct rte_memzone *mz;
struct rte_graph *rc = NULL;
mz = rte_memzone_lookup(name);
if (mz)
rc = mz->addr;
return graph_mem_fixup_secondray(rc);
}