[v2] examples/l2fwd: free resources in case of error

  Bugzilla ID: 437
Cc: dev@dpdk.org
Cc: stable@dpdk.org
Cc: bruce.richardson@intel.com
Cc: vipin.varghese@intel.com
Cc: jgrajcia@cisco.com
Signed-off-by: Muhammad Bilal <m.bilal@emumba.com>
---
 examples/l2fwd/main.c | 76 ++++++++++++++++++++++++++++++++++---------
 1 file changed, 60 insertions(+), 16 deletions(-)
  

Is there anything else to be done for acceptance? So that this problem
can be removed from other examples.

On Tue, May 12, 2020 at 6:57 PM Muhammad Bilal <m.bilal@emumba.com> wrote:
>
> Bugzilla ID: 437
> Cc: dev@dpdk.org
> Cc: stable@dpdk.org
> Cc: bruce.richardson@intel.com
> Cc: vipin.varghese@intel.com
> Cc: jgrajcia@cisco.com
> Signed-off-by: Muhammad Bilal <m.bilal@emumba.com>
> ---
>  examples/l2fwd/main.c | 76 ++++++++++++++++++++++++++++++++++---------
>  1 file changed, 60 insertions(+), 16 deletions(-)
>
> diff --git a/examples/l2fwd/main.c b/examples/l2fwd/main.c
> index 88ddfe589..efea2dce3 100644
> --- a/examples/l2fwd/main.c
> +++ b/examples/l2fwd/main.c
> @@ -517,6 +517,18 @@ signal_handler(int signum)
>         }
>  }
>
> +static void
> +stop_and_close_eth_dev(uint16_t portid)
> +{
> +       RTE_ETH_FOREACH_DEV(portid) {
> +               printf("Closing port %d...", portid);
> +               rte_eth_dev_stop(portid);
> +               rte_eth_dev_close(portid);
> +               printf(" Done\n");
> +               rte_eal_cleanup();
> +       }
> +}
> +
>  int
>  main(int argc, char **argv)
>  {
> @@ -524,7 +536,8 @@ main(int argc, char **argv)
>         int ret;
>         uint16_t nb_ports;
>         uint16_t nb_ports_available = 0;
> -       uint16_t portid, last_port;
> +       uint16_t portid = 0;
> +       uint16_t last_port;
>         unsigned lcore_id, rx_lcore_id;
>         unsigned nb_ports_in_mask = 0;
>         unsigned int nb_lcores = 0;
> @@ -543,8 +556,10 @@ main(int argc, char **argv)
>
>         /* parse application arguments (after the EAL ones) */
>         ret = l2fwd_parse_args(argc, argv);
> -       if (ret < 0)
> +       if (ret < 0) {
> +               stop_and_close_eth_dev(portid);
>                 rte_exit(EXIT_FAILURE, "Invalid L2FWD arguments\n");
> +       }
>
>         printf("MAC updating %s\n", mac_updating ? "enabled" : "disabled");
>
> @@ -552,13 +567,17 @@ main(int argc, char **argv)
>         timer_period *= rte_get_timer_hz();
>
>         nb_ports = rte_eth_dev_count_avail();
> -       if (nb_ports == 0)
> +       if (nb_ports == 0) {
> +               stop_and_close_eth_dev(portid);
>                 rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
> +       }
>
>         /* check port mask to possible port mask */
> -       if (l2fwd_enabled_port_mask & ~((1 << nb_ports) - 1))
> +       if (l2fwd_enabled_port_mask & ~((1 << nb_ports) - 1)) {
> +               stop_and_close_eth_dev(portid);
>                 rte_exit(EXIT_FAILURE, "Invalid portmask; possible (0x%x)\n",
>                         (1 << nb_ports) - 1);
> +       }
>
>         /* reset l2fwd_dst_ports */
>         for (portid = 0; portid < RTE_MAX_ETHPORTS; portid++)
> @@ -601,8 +620,10 @@ main(int argc, char **argv)
>                        lcore_queue_conf[rx_lcore_id].n_rx_port ==
>                        l2fwd_rx_queue_per_lcore) {
>                         rx_lcore_id++;
> -                       if (rx_lcore_id >= RTE_MAX_LCORE)
> +                       if (rx_lcore_id >= RTE_MAX_LCORE) {
> +                               stop_and_close_eth_dev(portid);
>                                 rte_exit(EXIT_FAILURE, "Not enough cores\n");
> +                       }
>                 }
>
>                 if (qconf != &lcore_queue_conf[rx_lcore_id]) {
> @@ -623,8 +644,10 @@ main(int argc, char **argv)
>         l2fwd_pktmbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", nb_mbufs,
>                 MEMPOOL_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE,
>                 rte_socket_id());
> -       if (l2fwd_pktmbuf_pool == NULL)
> +       if (l2fwd_pktmbuf_pool == NULL) {
> +               stop_and_close_eth_dev(portid);
>                 rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");
> +       }
>
>         /* Initialise each port */
>         RTE_ETH_FOREACH_DEV(portid) {
> @@ -645,32 +668,40 @@ main(int argc, char **argv)
>                 fflush(stdout);
>
>                 ret = rte_eth_dev_info_get(portid, &dev_info);
> -               if (ret != 0)
> +               if (ret != 0) {
> +                       stop_and_close_eth_dev(portid);
>                         rte_exit(EXIT_FAILURE,
>                                 "Error during getting device (port %u) info: %s\n",
>                                 portid, strerror(-ret));
> +               }
>
>                 if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
>                         local_port_conf.txmode.offloads |=
>                                 DEV_TX_OFFLOAD_MBUF_FAST_FREE;
>                 ret = rte_eth_dev_configure(portid, 1, 1, &local_port_conf);
> -               if (ret < 0)
> +               if (ret < 0) {
> +                       stop_and_close_eth_dev(portid);
>                         rte_exit(EXIT_FAILURE, "Cannot configure device: err=%d, port=%u\n",
>                                   ret, portid);
> +               }
>
>                 ret = rte_eth_dev_adjust_nb_rx_tx_desc(portid, &nb_rxd,
>                                                        &nb_txd);
> -               if (ret < 0)
> +               if (ret < 0) {
> +                       stop_and_close_eth_dev(portid);
>                         rte_exit(EXIT_FAILURE,
>                                  "Cannot adjust number of descriptors: err=%d, port=%u\n",
>                                  ret, portid);
> +               }
>
>                 ret = rte_eth_macaddr_get(portid,
>                                           &l2fwd_ports_eth_addr[portid]);
> -               if (ret < 0)
> +               if (ret < 0) {
> +                       stop_and_close_eth_dev(portid);
>                         rte_exit(EXIT_FAILURE,
>                                  "Cannot get MAC address: err=%d, port=%u\n",
>                                  ret, portid);
> +               }
>
>                 /* init one RX queue */
>                 fflush(stdout);
> @@ -680,9 +711,11 @@ main(int argc, char **argv)
>                                              rte_eth_dev_socket_id(portid),
>                                              &rxq_conf,
>                                              l2fwd_pktmbuf_pool);
> -               if (ret < 0)
> +               if (ret < 0) {
> +                       stop_and_close_eth_dev(portid);
>                         rte_exit(EXIT_FAILURE, "rte_eth_rx_queue_setup:err=%d, port=%u\n",
>                                   ret, portid);
> +               }
>
>                 /* init one TX queue on each port */
>                 fflush(stdout);
> @@ -691,27 +724,33 @@ main(int argc, char **argv)
>                 ret = rte_eth_tx_queue_setup(portid, 0, nb_txd,
>                                 rte_eth_dev_socket_id(portid),
>                                 &txq_conf);
> -               if (ret < 0)
> +               if (ret < 0) {
> +                       stop_and_close_eth_dev(portid);
>                         rte_exit(EXIT_FAILURE, "rte_eth_tx_queue_setup:err=%d, port=%u\n",
>                                 ret, portid);
> +               }
>
>                 /* Initialize TX buffers */
>                 tx_buffer[portid] = rte_zmalloc_socket("tx_buffer",
>                                 RTE_ETH_TX_BUFFER_SIZE(MAX_PKT_BURST), 0,
>                                 rte_eth_dev_socket_id(portid));
> -               if (tx_buffer[portid] == NULL)
> +               if (tx_buffer[portid] == NULL) {
> +                       stop_and_close_eth_dev(portid);
>                         rte_exit(EXIT_FAILURE, "Cannot allocate buffer for tx on port %u\n",
>                                         portid);
> +               }
>
>                 rte_eth_tx_buffer_init(tx_buffer[portid], MAX_PKT_BURST);
>
>                 ret = rte_eth_tx_buffer_set_err_callback(tx_buffer[portid],
>                                 rte_eth_tx_buffer_count_callback,
>                                 &port_statistics[portid].dropped);
> -               if (ret < 0)
> +               if (ret < 0) {
> +                       stop_and_close_eth_dev(portid);
>                         rte_exit(EXIT_FAILURE,
>                         "Cannot set error callback for tx buffer on port %u\n",
>                                  portid);
> +               }
>
>                 ret = rte_eth_dev_set_ptypes(portid, RTE_PTYPE_UNKNOWN, NULL,
>                                              0);
> @@ -720,17 +759,21 @@ main(int argc, char **argv)
>                                         portid);
>                 /* Start device */
>                 ret = rte_eth_dev_start(portid);
> -               if (ret < 0)
> +               if (ret < 0) {
> +                       stop_and_close_eth_dev(portid);
>                         rte_exit(EXIT_FAILURE, "rte_eth_dev_start:err=%d, port=%u\n",
>                                   ret, portid);
> +               }
>
>                 printf("done: \n");
>
>                 ret = rte_eth_promiscuous_enable(portid);
> -               if (ret != 0)
> +               if (ret != 0) {
> +                       stop_and_close_eth_dev(portid);
>                         rte_exit(EXIT_FAILURE,
>                                  "rte_eth_promiscuous_enable:err=%s, port=%u\n",
>                                  rte_strerror(-ret), portid);
> +               }
>
>                 printf("Port %u, MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n\n",
>                                 portid,
> @@ -746,6 +789,7 @@ main(int argc, char **argv)
>         }
>
>         if (!nb_ports_available) {
> +               stop_and_close_eth_dev(portid);
>                 rte_exit(EXIT_FAILURE,
>                         "All available ports are disabled. Please set portmask.\n");
>         }
> --
> 2.17.1
>
  

On Tue, 12 May 2020 18:56:37 +0500
Muhammad Bilal <m.bilal@emumba.com> wrote:

> Bugzilla ID: 437
> Cc: dev@dpdk.org
> Cc: stable@dpdk.org
> Cc: bruce.richardson@intel.com
> Cc: vipin.varghese@intel.com
> Cc: jgrajcia@cisco.com
> Signed-off-by: Muhammad Bilal <m.bilal@emumba.com>

This whole series was just trying to workaround a bug in memif driver.
Please fix that driver instead.