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From: Ajit Khaparde <ajit.khaparde@broadcom.com>
To: wangyunjian <wangyunjian@huawei.com>
Cc: dpdk-dev <dev@dpdk.org>, Thomas Monjalon <thomas@monjalon.net>,
	 Ferruh Yigit <ferruh.yigit@intel.com>,
	Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
	 Stephen Hemminger <stephen@networkplumber.org>,
	"Lilijun (Jerry)" <jerry.lilijun@huawei.com>,
	 xudingke <xudingke@huawei.com>, dpdk stable <stable@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v4] ethdev: fix data type for port id
Date: Tue, 3 Nov 2020 19:26:46 -0800
Message-ID: <CACZ4nhuqqtNLo1jkdq+AgJ2-nwowU45yJL6PykQW8ZuCBuMuiw@mail.gmail.com> (raw)
In-Reply-To: <1604458677-34696-1-git-send-email-wangyunjian@huawei.com>

On Tue, Nov 3, 2020 at 6:58 PM wangyunjian <wangyunjian@huawei.com> wrote:
>
> From: Yunjian Wang <wangyunjian@huawei.com>
>
> The ethdev port id is 16 bits now. This patch fixes the data type
> of the variable for 'pid', which changing from uint32_t to uint16_t.
>
> RTE_MAX_ETHPORTS is the maximum number of ports, which customized by
> the user. To avoid 16-bit unsigned integer overflow, the valid value
> of RTE_MAX_ETHPORTS should be set from 0 to UINT16_MAX, and it is
> safer to cut one more port from space.
>
> So we use RTE_BUILD_BUG_ON() to ensure that RTE_MAX_ETHPORTS is less
> to UINT16_MAX.
>
> Fixes: 5b7ba31148a8 ("ethdev: add port ownership")
> Cc: stable@dpdk.org
>
> Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>

Acked-by: Ajit Khaparde <ajit.khaparde@broadcom.com>

> ---
> v4:
>    remove redundant compile checks
> v3:
>    fix code styles suggested by Thomas Monjalon and Andrew Rybchenko
> v2:
>    add RTE_BUILD_BUG_ON() check for RTE_MAX_ETHPORTS validity
> ---
>  lib/librte_ethdev/rte_ethdev.c | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
> index b12bb3854d..0af8e4d76c 100644
> --- a/lib/librte_ethdev/rte_ethdev.c
> +++ b/lib/librte_ethdev/rte_ethdev.c
> @@ -411,7 +411,9 @@ eth_dev_is_allocated(const struct rte_eth_dev *ethdev)
>  static struct rte_eth_dev *
>  eth_dev_allocated(const char *name)
>  {
> -       unsigned i;
> +       uint16_t i;
> +
> +       RTE_BUILD_BUG_ON(RTE_MAX_ETHPORTS >= UINT16_MAX);
>
>         for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
>                 if (rte_eth_devices[i].data != NULL &&
> @@ -440,7 +442,7 @@ rte_eth_dev_allocated(const char *name)
>  static uint16_t
>  eth_dev_find_free_port(void)
>  {
> -       unsigned i;
> +       uint16_t i;
>
>         for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
>                 /* Using shared name field to find a free port. */
> @@ -816,7 +818,7 @@ rte_eth_dev_get_name_by_port(uint16_t port_id, char *name)
>  int
>  rte_eth_dev_get_port_by_name(const char *name, uint16_t *port_id)
>  {
> -       uint32_t pid;
> +       uint16_t pid;
>
>         if (name == NULL) {
>                 RTE_ETHDEV_LOG(ERR, "Null pointer is specified\n");
> @@ -4290,7 +4292,7 @@ rte_eth_mirror_rule_reset(uint16_t port_id, uint8_t rule_id)
>
>  RTE_INIT(eth_dev_init_cb_lists)
>  {
> -       int i;
> +       uint16_t i;
>
>         for (i = 0; i < RTE_MAX_ETHPORTS; i++)
>                 TAILQ_INIT(&rte_eth_devices[i].link_intr_cbs);
> @@ -4303,7 +4305,7 @@ rte_eth_dev_callback_register(uint16_t port_id,
>  {
>         struct rte_eth_dev *dev;
>         struct rte_eth_dev_callback *user_cb;
> -       uint32_t next_port; /* size is 32-bit to prevent loop wrap-around */
> +       uint16_t next_port;
>         uint16_t last_port;
>
>         if (!cb_fn)
> @@ -4366,7 +4368,7 @@ rte_eth_dev_callback_unregister(uint16_t port_id,
>         int ret;
>         struct rte_eth_dev *dev;
>         struct rte_eth_dev_callback *cb, *next;
> -       uint32_t next_port; /* size is 32-bit to prevent loop wrap-around */
> +       uint16_t next_port;
>         uint16_t last_port;
>
>         if (!cb_fn)
> @@ -5507,7 +5509,7 @@ static struct rte_eth_dev_switch {
>  int
>  rte_eth_switch_domain_alloc(uint16_t *domain_id)
>  {
> -       unsigned int i;
> +       uint16_t i;
>
>         *domain_id = RTE_ETH_DEV_SWITCH_DOMAIN_ID_INVALID;
>
> --
> 2.18.1
>

  reply	other threads:[~2020-11-04  3:27 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-26 12:24 [dpdk-dev] [PATCH] " wangyunjian
2020-10-26 12:29 ` Thomas Monjalon
2020-10-26 12:33   ` Andrew Rybchenko
2020-10-26 12:34     ` Thomas Monjalon
2020-10-27  2:46       ` wangyunjian
2020-10-27  8:47         ` Thomas Monjalon
2020-10-26 12:29 ` Andrew Rybchenko
2020-10-27 13:41 ` [dpdk-dev] [PATCH v2] " wangyunjian
2020-10-27 14:29   ` Thomas Monjalon
2020-10-29 12:18     ` wangyunjian
2020-10-29 12:40       ` Andrew Rybchenko
2020-10-29 12:43       ` Thomas Monjalon
2020-11-02  9:18   ` [dpdk-dev] [PATCH v3] " wangyunjian
2020-11-03 18:44     ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2020-11-03 23:42       ` Stephen Hemminger
2020-11-04  1:57       ` wangyunjian
2020-11-04  2:57     ` [dpdk-dev] [PATCH v4] " wangyunjian
2020-11-04  3:26       ` Ajit Khaparde [this message]
2020-11-04 11:46         ` Ferruh Yigit
2020-11-04 13:49           ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit

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