Hi Julien
>
> Each cryptodev are indexed with its dev_id in the global
> rte_crypto_devices variable. nb_devs is incremented / decremented each
> time a cryptodev is created / deleted. The goal of nb_devs is to prevent
> the user to get an invalid dev_id.
>
> Let's imagine DPDK has configured N cryptodevs. If the cryptodev=1 is
> removed at runtime, the latest cryptodev N cannot be accessible, because
> nb_devs=N-1.
>
> In order to prevent this kind of behavior, let's remove the check with
> nb_devs and iterate in all the rte_crypto_devices elements: if data is
> not NULL, that means a valid cryptodev is available.
>
> Fixes: d11b0f30df88 ("cryptodev: introduce API and framework for crypto
> devices")
> Cc: sta...@dpdk.org
>
> Signed-off-by: Julien Meunier <julien.meun...@nokia.com>
> ---
> lib/librte_cryptodev/rte_cryptodev.c | 42 ++++++++++++++++++++++++----------
> --
> 1 file changed, 28 insertions(+), 14 deletions(-)
>
> diff --git a/lib/librte_cryptodev/rte_cryptodev.c
> b/lib/librte_cryptodev/rte_cryptodev.c
> index 43bc335..c8c7ffd 100644
> --- a/lib/librte_cryptodev/rte_cryptodev.c
> +++ b/lib/librte_cryptodev/rte_cryptodev.c
> @@ -49,9 +49,7 @@ struct rte_cryptodev *rte_cryptodevs = rte_crypto_devices;
>
> static struct rte_cryptodev_global cryptodev_globals = {
> .devs = rte_crypto_devices,
> - .data = { NULL },
> - .nb_devs = 0,
> - .max_devs = RTE_CRYPTO_MAX_DEVS
> + .data = { NULL }
> };
>
> /* spinlock for crypto device callbacks */
> @@ -512,7 +510,7 @@ rte_cryptodev_pmd_get_named_dev(const char *name)
> if (name == NULL)
> return NULL;
>
> - for (i = 0; i < cryptodev_globals.max_devs; i++) {
> + for (i = 0; i < RTE_CRYPTO_MAX_DEVS; i++) {
> dev = &cryptodev_globals.devs[i];
>
> if ((dev->attached == RTE_CRYPTODEV_ATTACHED) &&
> @@ -523,12 +521,21 @@ rte_cryptodev_pmd_get_named_dev(const char
> *name)
> return NULL;
> }
>
> +static uint8_t
> +rte_cryptodev_is_valid_device_data(uint8_t dev_id)
> +{
> + if (rte_crypto_devices[dev_id].data == NULL)
> + return 0;
> +
> + return 1;
> +}
> +
> unsigned int
> rte_cryptodev_pmd_is_valid_dev(uint8_t dev_id)
> {
> struct rte_cryptodev *dev = NULL;
>
> - if (dev_id >= cryptodev_globals.nb_devs)
> + if (!rte_cryptodev_is_valid_device_data(dev_id))
> return 0;
>
> dev = rte_cryptodev_pmd_get_dev(dev_id);
> @@ -547,12 +554,15 @@ rte_cryptodev_get_dev_id(const char *name)
> if (name == NULL)
> return -1;
>
> - for (i = 0; i < cryptodev_globals.nb_devs; i++)
> + for (i = 0; i < RTE_CRYPTO_MAX_DEVS; i++) {
> + if (!rte_cryptodev_is_valid_device_data(i))
> + continue;
> if ((strcmp(cryptodev_globals.devs[i].data->name, name)
> == 0) &&
> (cryptodev_globals.devs[i].attached ==
> RTE_CRYPTODEV_ATTACHED))
> return i;
> + }
>
> return -1;
> }
> @@ -560,7 +570,13 @@ rte_cryptodev_get_dev_id(const char *name)
> uint8_t
> rte_cryptodev_count(void)
> {
> - return cryptodev_globals.nb_devs;
> + uint8_t i, dev_count = 0;
> +
> + for (i = 0; i < RTE_CRYPTO_MAX_DEVS; i++)
> + if (cryptodev_globals.devs[i].data != NULL)
> + dev_count++;
> +
> + return dev_count;
> }
Why do you want to remove the nb_devs? We can have it updated
(incremented/decremented)
While allocate/release of the device.
The point is, whenever somebody call rte_cryptodev_count() it will do a lookup
of valid data
pointer.
>
> uint8_t
> @@ -568,7 +584,7 @@ rte_cryptodev_device_count_by_driver(uint8_t
> driver_id)
> {
> uint8_t i, dev_count = 0;
>
> - for (i = 0; i < cryptodev_globals.max_devs; i++)
> + for (i = 0; i < RTE_CRYPTO_MAX_DEVS; i++)
> if (cryptodev_globals.devs[i].driver_id == driver_id &&
> cryptodev_globals.devs[i].attached ==
> RTE_CRYPTODEV_ATTACHED)
> @@ -583,9 +599,10 @@ rte_cryptodev_devices_get(const char *driver_name,
> uint8_t *devices,
> {
> uint8_t i, count = 0;
> struct rte_cryptodev *devs = cryptodev_globals.devs;
> - uint8_t max_devs = cryptodev_globals.max_devs;
>
> - for (i = 0; i < max_devs && count < nb_devices; i++) {
> + for (i = 0; i < RTE_CRYPTO_MAX_DEVS && count < nb_devices; i++) {
> + if (!rte_cryptodev_is_valid_device_data(i))
> + continue;
>
> if (devs[i].attached == RTE_CRYPTODEV_ATTACHED) {
> int cmp;
> @@ -736,8 +753,6 @@ rte_cryptodev_pmd_allocate(const char *name, int
> socket_id)
> TAILQ_INIT(&(cryptodev->link_intr_cbs));
>
> cryptodev->attached = RTE_CRYPTODEV_ATTACHED;
> -
> - cryptodev_globals.nb_devs++;
> }
>
> return cryptodev;
> @@ -766,7 +781,6 @@ rte_cryptodev_pmd_release_device(struct
> rte_cryptodev *cryptodev)
> return ret;
>
> cryptodev->attached = RTE_CRYPTODEV_DETACHED;
> - cryptodev_globals.nb_devs--;
> return 0;
> }
>
> @@ -1099,7 +1113,7 @@ rte_cryptodev_info_get(uint8_t dev_id, struct
> rte_cryptodev_info *dev_info)
> {
> struct rte_cryptodev *dev;
>
> - if (dev_id >= cryptodev_globals.nb_devs) {
> + if (!rte_cryptodev_pmd_is_valid_dev(dev_id)) {
> CDEV_LOG_ERR("Invalid dev_id=%d", dev_id);
> return;
> }
> --
> 2.10.2
