Re: [PATCH v3 3/5] app/testpmd: fix port status of slave device

[Konstantin Ananyev <konstantin.v.ananyev@yandex.ru>]

Hi Conor,

> 在 2022/5/4 7:39, Konstantin Ananyev 写道:
>> 03/05/2022 11:02, Min Hu (Connor) пишет:
>>> From: Huisong Li <lihuisong@huawei.com>
>>>
>>> Starting or stopping a bonded port also starts or stops all active 
>>> slaves
>>> under the bonded port. If this port is a bonded device, we need to 
>>> modify
>>> the port status of all slaves.
>>>
>>> Fixes: 0e545d3047fe ("app/testpmd: check stopping port is not in 
>>> bonding")
>>> Cc: stable@dpdk.org
>>>
>>> Signed-off-by: Huisong Li <lihuisong@huawei.com>
>>> Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
>>> Acked-by: Aman Singh <aman.deep.singh@intel.com>
>>> ---
>>>   app/test-pmd/cmdline.c |  1 +
>>>   app/test-pmd/testpmd.c | 74 +++++++++++++++++++++++++++++++++++++++---
>>>   app/test-pmd/testpmd.h |  3 +-
>>>   3 files changed, 73 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
>>> index 6ffea8e21a..d9fc7a88bd 100644
>>> --- a/app/test-pmd/cmdline.c
>>> +++ b/app/test-pmd/cmdline.c
>>> @@ -6671,6 +6671,7 @@ static void 
>>> cmd_create_bonded_device_parsed(void *parsed_result,
>>>                   "Failed to enable promiscuous mode for port %u: %s 
>>> - ignore\n",
>>>                   port_id, rte_strerror(-ret));
>>> +        ports[port_id].bond_flag = 1;
>>>           ports[port_id].need_setup = 0;
>>>           ports[port_id].port_status = RTE_PORT_STOPPED;
>>>       }
>>> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
>>> index fe2ce19f99..dc90600787 100644
>>> --- a/app/test-pmd/testpmd.c
>>> +++ b/app/test-pmd/testpmd.c
>>> @@ -66,6 +66,9 @@
>>>   #ifdef RTE_EXEC_ENV_WINDOWS
>>>   #include <process.h>
>>>   #endif
>>> +#ifdef RTE_NET_BOND
>>> +#include <rte_eth_bond.h>
>>> +#endif
>>>   #include "testpmd.h"
>>> @@ -597,11 +600,57 @@ eth_dev_configure_mp(uint16_t port_id, uint16_t 
>>> nb_rx_q, uint16_t nb_tx_q,
>>>       return 0;
>>>   }
>>> +#ifdef RTE_NET_BOND
>>> +static int
>>> +change_bonding_slave_port_status(portid_t bond_pid, bool is_stop)
>>> +{
>>> +    portid_t slave_pids[RTE_MAX_ETHPORTS];
>>> +    struct rte_port *port;
>>> +    int num_slaves;
>>> +    portid_t slave_pid;
>>> +    int i;
>>> +
>>> +    num_slaves = rte_eth_bond_slaves_get(bond_pid, slave_pids,
>>> +                        RTE_MAX_ETHPORTS);
>>> +    if (num_slaves < 0) {
>>> +        fprintf(stderr, "Failed to get slave list for port = %u\n",
>>> +            bond_pid);
>>> +        return num_slaves;
>>> +    }
>>> +
>>> +    for (i = 0; i < num_slaves; i++) {
>>> +        slave_pid = slave_pids[i];
>>> +        port = &ports[slave_pid];
>>> +        port->port_status =
>>> +            is_stop ? RTE_PORT_STOPPED : RTE_PORT_STARTED;
>>> +    }
>>> +
>>> +    return 0;
>>> +}
>>> +#endif
>>> +
>>>   static int
>>>   eth_dev_start_mp(uint16_t port_id)
>>>   {
>>> -    if (is_proc_primary())
>>> -        return rte_eth_dev_start(port_id);
>>> +    int ret;
>>> +
>>> +    if (is_proc_primary()) {
>>> +        ret = rte_eth_dev_start(port_id);
>>> +        if (ret != 0)
>>> +            return ret;
>>> +
>>> +#ifdef RTE_NET_BOND
>>> +        struct rte_port *port = &ports[port_id];
>>> +
>>> +        /*
>>> +         * Starting a bonded port also starts all slaves under the 
>>> bonded
>>> +         * device. So if this port is bond device, we need to modify 
>>> the
>>> +         * port status of these slaves.
>>> +         */
>>> +        if (port->bond_flag == 1)
>>> +            return change_bonding_slave_port_status(port_id, false);
>>> +#endif
>>> +    }
>>>       return 0;
>>>   }
>>> @@ -609,8 +658,25 @@ eth_dev_start_mp(uint16_t port_id)
>>>   static int
>>>   eth_dev_stop_mp(uint16_t port_id)
>>>   {
>>> -    if (is_proc_primary())
>>> -        return rte_eth_dev_stop(port_id);
>>> +    int ret;
>>> +
>>> +    if (is_proc_primary()) {
>>> +        ret = rte_eth_dev_stop(port_id);
>>> +        if (ret != 0)
>>> +            return ret;
>>> +
>>> +#ifdef RTE_NET_BOND
>>
>> Here and in other places - probably no need to pollute the code
>> with all these 'ifdef RTE_NET_BOND'.
>> I suppose this logic (for checking is bonding API present or not)
>> can be hidden inside change_bonding_slave_port_status() itself.
>>
> I think it does not pollute the code. anyone can tell according to
> the flag 'ifdef RTE_NET_BOND'.


That what I am talking about.
Spreading ifdefed code all around the palce is not a good thing.
It makes it harder to read, understand and maintain.
Much more plausible is to hide that logic in one place whenever possible.


> if hiddle inside 'change_bonding_slave_port_status', it will be weird.

I don't see why is that.
Let say if bonding is disabled that function can do nothing or even 
return an error to avoid it's misuse.

> For example, if the port is not bonding port, It will also invoke 
> 'change_bonding_slave_port_status'. That is unreasonable.


As I can read the code, hange_bonding_slave_port_status() will be 
invoked only when port->bond_flag is set. Which implies that port is a 
bonded one, no?

> 
> 
>>
>>> +        struct rte_port *port = &ports[port_id];
>>> +
>>> +        /*
>>> +         * Stopping a bonded port also stops all slaves under the 
>>> bonded
>>> +         * device. So if this port is bond device, we need to modify 
>>> the
>>> +         * port status of these slaves.
>>> +         */
>>> +        if (port->bond_flag == 1)
>>> +            return change_bonding_slave_port_status(port_id, true);
>>> +#endif
>>> +    }
>>>       return 0;
>>>   }
>>> diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
>>> index 31f766c965..67f253b30e 100644
>>> --- a/app/test-pmd/testpmd.h
>>> +++ b/app/test-pmd/testpmd.h
>>> @@ -266,7 +266,8 @@ struct rte_port {
>>>       uint32_t                mc_addr_nb; /**< nb. of addr. in 
>>> mc_addr_pool */
>>>       queueid_t               queue_nb; /**< nb. of queues for flow 
>>> rules */
>>>       uint32_t                queue_sz; /**< size of a queue for flow 
>>> rules */
>>> -    uint8_t                 slave_flag; /**< bonding slave port */
>>> +    uint8_t                 slave_flag : 1, /**< bonding slave port */
>>> +                bond_flag : 1; /**< port is bond device */
>>>       struct port_template    *pattern_templ_list; /**< Pattern 
>>> templates. */
>>>       struct port_template    *actions_templ_list; /**< Actions 
>>> templates. */
>>>       struct port_table       *table_list; /**< Flow tables. */
>>
>> .