There’s no need to call pool_alloc(...) in typical cases. Pools are vectors
(dynamic arrays), they expand as necessary.
During initial development, please always run TAG=vpp_debug or equivalent
images. If you make mistakes with vector-based data structure(s), the code
tends to ASSERT(...) immediately.
There are a ton of pool-based examples. It’s really no more complicated than:
typedef struct {
foo_t * foo_pool;
} my_main_t;
my_main_t my_main;
foo_t *object;
my_main_t *mp = &my_main;
pool_get (mp->foo_pool, object);
memset(object, 0, sizeof(*object));
object_index = object - mp->foo_pool; /* invariant forever */
/* recover object by index, safe across pool expansion */
object = pool_elt_at_index (mp->foo_pool, object_index);
/* Free the object */
pool_put (mp->foo_pool, object);
or
pool_put_index (mp->foo_pool, object_index);
Notes include: never memorize pointers to objects allocated in this manner,
unless you enjoy debugging dangling reference bugs. Always memorize pool
indices instead...
Thanks… Dave
From: vpp-dev-boun...@lists.fd.io [mailto:vpp-dev-boun...@lists.fd.io] On
Behalf Of Sreejith Surendran Nair
Sent: Tuesday, February 7, 2017 7:19 AM
To: vpp-dev <vpp-dev@lists.fd.io>
Subject: [vpp-dev] Query regarding VPP Pool allocation
Hi All,
I am working on VPP/ODP Integration. I had query regarding "pool_get" API.
I am using call "pool_get(om->interfaces,oif) " with parameters
"om->interfaces" and "oif" should we need to allocate memory for
"om->interfaces" using "pool_alloc" before calling pool_get.
I am presently not using "pool_alloc" to allocate memory and using" pool_get"
during interface creation and "pool_put" during interface deletion. I followed
"af_packet/netmap" as reference implementation,
But when I tried to delete the interface I saw "pool_put" call is getting stuck
as the next statements are not executed. I thought it may be because
"pool_alloc" was not used for "om->interfaces".Also while creating multiple
interface and deleting the same I am getting a crash due to pool not free error.
If possible kindly request if anyone could please correct me.
Thanks & Regards,
Sreejith
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