Re: [dpdk-dev] [PATCH v4 1/4] librte_ethdev: Introduce a function to release HW rings

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 6/23/2020 10:11 AM, Renata Saiakhova wrote:
> Hi Ferruh,
> 
> I added an INTERNAL block in .map file, that gives me an error:
> 
> Build targets in project: 806
> Found ninja-1.8.2 at /usr/bin/ninja
> [7/627] Linking target lib/librte_ethdev.so.20.0.3.
> FAILED: lib/librte_ethdev.so.20.0.3
> ccache cc  -o lib/librte_ethdev.so.20.0.3
> 'lib/lib@@rte_ethdev@sta/librte_ethdev_ethdev_private.c.o'
> 'lib/lib@@rte_ethdev@sta/librte_ethdev_ethdev_profile.c.o'
> 'lib/lib@@rte_ethdev@sta/librte_ethdev_ethdev_trace_points.c.o'
> 'lib/lib@@rte_ethdev@sta/librte_ethdev_rte_class_eth.c.o'
> 'lib/lib@@rte_ethdev@sta/librte_ethdev_rte_ethdev.c.o'
> 'lib/lib@@rte_ethdev@sta/librte_ethdev_rte_flow.c.o'
> 'lib/lib@@rte_ethdev@sta/librte_ethdev_rte_mtr.c.o'
> 'lib/lib@@rte_ethdev@sta/librte_ethdev_rte_tm.c.o' -Wl,--no-undefined
> -Wl,--as-needed -Wl,-O1 -shared -fPIC -Wl,--start-group
> -Wl,-soname,librte_ethdev.so.20.0 -Wl,--no-as-needed -pthread -lm -ldl -lnuma
> lib/librte_eal.so.20.0.3 lib/librte_kvargs.so.20.0.3
> lib/librte_telemetry.so.0.200.3 lib/librte_net.so.20.0.3
> lib/librte_mbuf.so.20.0.3 lib/librte_mempool.so.20.0.3 lib/librte_ring.so.20.0.3
> lib/librte_meter.so.20.0.3 -Wl,--end-group
> -Wl,--version-script=/home/renata/work/dpdk/lib/librte_ethdev/rte_ethdev_version.map
> '-Wl,-rpath,$ORIGIN/' -Wl,-rpath-link,/home/renata/work/dpdk/build/lib  
> /usr/bin/ld:/home/renata/work/dpdk/lib/librte_ethdev/rte_ethdev_version.map:0:
> syntax error in VERSION script
> collect2: error: ld returned 1 exit status
> 
> What could be an issue, is that I need to correct the version somewhere?

Hi Renata,

The log says "syntax error in VERSION script", can be related to it. I did
following update on top of your patches and it seems worked for me:

 diff --git a/lib/librte_ethdev/rte_ethdev_driver.h b/lib/librte_ethdev
/rte_ethdev_driver.h
 index 462e765d1..ca16f1bcc 100644
 --- a/lib/librte_ethdev/rte_ethdev_driver.h
 +++ b/lib/librte_ethdev/rte_ethdev_driver.h
 @@ -181,9 +181,6 @@ rte_eth_dma_zone_reserve(const struct rte_eth_dev *eth_dev,
 const char *name,
                          unsigned align, int socket_id);

  /**
 - * @warning
 - * @b EXPERIMENTAL: this API may change without prior notice.
 - *
   * Free previously allocated memzone for HW rings.
   *
   * @param eth_dev
 @@ -195,7 +192,7 @@ rte_eth_dma_zone_reserve(const struct rte_eth_dev *eth_dev,
const char *name,
   * @return
   *   Negative errno value on error, 0 on success.
   */
 -__rte_experimental
 +__rte_internal
  int
  rte_eth_dma_zone_free(const struct rte_eth_dev *dev, const char *ring_name,
                  uint16_t queue_id);
 diff --git a/lib/librte_ethdev/rte_ethdev_version.map b/lib/librte_ethdev
/rte_ethdev_version.map
 index 139a81302..1212a17d3 100644
 --- a/lib/librte_ethdev/rte_ethdev_version.map
 +++ b/lib/librte_ethdev/rte_ethdev_version.map
 @@ -241,5 +241,10 @@ EXPERIMENTAL {
         __rte_ethdev_trace_rx_burst;
         __rte_ethdev_trace_tx_burst;
         rte_flow_get_aged_flows;
 +};
 +
 +INTERNAL {
 +       global:
 +
         rte_eth_dma_zone_free;
  };


> 
> --------------------------------------------------------------------------------
> *From:* Ferruh Yigit <ferruh.yigit@intel.com>
> *Sent:* Monday, June 22, 2020 7:09 PM
> *To:* Renata Saiakhova <renata.saiakhova@ekinops.com>; dev@dpdk.org <dev@dpdk.org>
> *Subject:* Re: [dpdk-dev] [PATCH v4 1/4] librte_ethdev: Introduce a function to
> release HW rings
>  
> On 6/22/2020 10:54 AM, Renata Saiakhova wrote:
>> Free previously allocated memzone for HW rings
>> 
>> Signed-off-by: Renata Saiakhova <Renata.Saiakhova@ekinops.com>
>> ---
>>  lib/librte_ethdev/rte_ethdev.c           | 30 ++++++++++++++++++++++--
>>  lib/librte_ethdev/rte_ethdev_driver.h    | 20 ++++++++++++++++
>>  lib/librte_ethdev/rte_ethdev_version.map |  1 +
>>  3 files changed, 49 insertions(+), 2 deletions(-)
>> 
>> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
>> index 72aed59a5..ec1da2006 100644
>> --- a/lib/librte_ethdev/rte_ethdev.c
>> +++ b/lib/librte_ethdev/rte_ethdev.c
>> @@ -4181,6 +4181,10 @@ rte_eth_dev_rx_intr_ctl_q_get_fd(uint16_t port_id, uint16_t queue_id)
>>        return fd;
>>  }
>>  
>> +#define ETH_DMA_MZONE_NAME(_name, _port_id, _queue_id, _ring_name) \
>> +     snprintf(_name, sizeof(_name), "eth_p%d_q%d_%s", \
>> +                     _port_id, _queue_id, _ring_name)
>> +
>>  const struct rte_memzone *
>>  rte_eth_dma_zone_reserve(const struct rte_eth_dev *dev, const char *ring_name,
>>                         uint16_t queue_id, size_t size, unsigned align,
>> @@ -4190,8 +4194,7 @@ rte_eth_dma_zone_reserve(const struct rte_eth_dev *dev, const char *ring_name,
>>        const struct rte_memzone *mz;
>>        int rc;
>>  
>> -     rc = snprintf(z_name, sizeof(z_name), "eth_p%d_q%d_%s",
>> -                   dev->data->port_id, queue_id, ring_name);
>> +     rc = ETH_DMA_MZONE_NAME(z_name, dev->data->port_id, queue_id, ring_name);
>>        if (rc >= RTE_MEMZONE_NAMESIZE) {
>>                RTE_ETHDEV_LOG(ERR, "ring name too long\n");
>>                rte_errno = ENAMETOOLONG;
>> @@ -4206,6 +4209,29 @@ rte_eth_dma_zone_reserve(const struct rte_eth_dev *dev, const char *ring_name,
>>                        RTE_MEMZONE_IOVA_CONTIG, align);
>>  }
>>  
>> +int
>> +rte_eth_dma_zone_free(const struct rte_eth_dev *dev, const char *ring_name,
>> +             uint16_t queue_id)
>> +{
>> +     char z_name[RTE_MEMZONE_NAMESIZE];
>> +     const struct rte_memzone *mz;
>> +     int rc = 0;
>> +
>> +     rc = ETH_DMA_MZONE_NAME(z_name, dev->data->port_id, queue_id, ring_name);
>> +     if (rc >= RTE_MEMZONE_NAMESIZE) {
>> +             RTE_ETHDEV_LOG(ERR, "ring name too long\n");
>> +             return -ENAMETOOLONG;
>> +     }
>> +
>> +     mz = rte_memzone_lookup(z_name);
>> +     if (mz)
>> +             rc = rte_memzone_free(mz);
>> +     else
>> +             rc = -EINVAL;
>> +
>> +     return rc;
>> +}
>> +
>>  int
>>  rte_eth_dev_create(struct rte_device *device, const char *name,
>>        size_t priv_data_size,
>> diff --git a/lib/librte_ethdev/rte_ethdev_driver.h b/lib/librte_ethdev/rte_ethdev_driver.h
>> index 99d4cd6cd..462e765d1 100644
>> --- a/lib/librte_ethdev/rte_ethdev_driver.h
>> +++ b/lib/librte_ethdev/rte_ethdev_driver.h
>> @@ -180,6 +180,26 @@ rte_eth_dma_zone_reserve(const struct rte_eth_dev *eth_dev, const char *name,
>>                         uint16_t queue_id, size_t size,
>>                         unsigned align, int socket_id);
>>  
>> +/**
>> + * @warning
>> + * @b EXPERIMENTAL: this API may change without prior notice.
>> + *
>> + * Free previously allocated memzone for HW rings.
>> + *
>> + * @param eth_dev
>> + *   The *eth_dev* pointer is the address of the *rte_eth_dev* structure
>> + * @param name
>> + *   The name of the memory zone
>> + * @param queue_id
>> + *   The index of the queue to add to name
>> + * @return
>> + *   Negative errno value on error, 0 on success.
>> + */
>> +__rte_experimental
>> +int
>> +rte_eth_dma_zone_free(const struct rte_eth_dev *dev, const char *ring_name,
>> +              uint16_t queue_id);
>> +
> 
> Hi Renata,
> 
> This API is not for applications, only for drivers, right?
> We recently (last release ?) introduced 'internal' (__rte_internal) attribute,
> we can use '__rte_internal' instead of '__rte_experimental' if the API is not
> for applications. This requires adding 'INTERNAL' block in .map file (sample
> 'lib/librte_eal/rte_eal_version.map')
> 
> 
> Also there are a few contribution conventions related issues which can be fixed
> while merging but please check them if you will be doing new version:
>  subsystem is only libname without prefix: 'ethdev'
>  Commit title description starts with lowercase: 'introduce'.
> sample => "ethdev: add function to release HW rings"
> 
> 
> Thanks,
> ferruh