[ovs-dev] [PATCH v7 5/6] netdev-dpdk: Reword mp_size as n_mbufs.

Kevin Traynor ktraynor at redhat.com
Thu Oct 19 10:54:13 UTC 2017


On 10/18/2017 05:01 PM, antonio.fischetti at intel.com wrote:
> For code readability purposes mp_size is renamed as n_mbufs
> in dpdk_mp structure.
> This parameter is passed to rte mempool creation functions
> and is meant to contain the number of elements inside
> the requested mempool.
> 
> CC: Ciara Loftus <ciara.loftus at intel.com>
> CC: Kevin Traynor <ktraynor at redhat.com>
> CC: Aaron Conole <aconole at redhat.com>
> Acked-by: Mark Kavanagh <mark.b.kavanagh at intel.com>
> Signed-off-by: Antonio Fischetti <antonio.fischetti at intel.com>
> ---

LGTM.
Acked-by: Kevin Traynor <ktraynor at redhat.com>

>  lib/netdev-dpdk.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
> index a3b4638..0057e6b 100644
> --- a/lib/netdev-dpdk.c
> +++ b/lib/netdev-dpdk.c
> @@ -308,7 +308,7 @@ struct dpdk_mp {
>      int mtu;
>      int socket_id;
>      char if_name[IFNAMSIZ];
> -    unsigned mp_size;
> +    unsigned n_mbufs;   /* Number of mbufs inside the mempool. */
>      struct ovs_list list_node OVS_GUARDED_BY(dpdk_mp_mutex);
>  };
>  
> @@ -500,11 +500,11 @@ dpdk_mp_name(struct dpdk_mp *dmp)
>      uint32_t h = hash_string(dmp->if_name, 0);
>      char *mp_name = xcalloc(RTE_MEMPOOL_NAMESIZE, sizeof *mp_name);
>      int ret = snprintf(mp_name, RTE_MEMPOOL_NAMESIZE, "ovs_%x_%d_%d_%u",
> -                       h, dmp->socket_id, dmp->mtu, dmp->mp_size);
> +                       h, dmp->socket_id, dmp->mtu, dmp->n_mbufs);
>      if (ret < 0 || ret >= RTE_MEMPOOL_NAMESIZE) {
>          VLOG_DBG("Failed to generate a mempool name for \"%s\". "
>              "Hash:0x%x, mtu:%d, mbufs:%u, %s",
> -            dmp->if_name, h, dmp->mtu, dmp->mp_size, ovs_strerror(ret));
> +            dmp->if_name, h, dmp->mtu, dmp->n_mbufs, ovs_strerror(ret));
>          return NULL;
>      }
>      return mp_name;
> @@ -523,13 +523,13 @@ dpdk_mp_create(struct netdev_dpdk *dev, int mtu, bool *mp_exists)
>      ovs_strzcpy(dmp->if_name, dev->up.name, IFNAMSIZ);
>  
>      /*
> -     * XXX: rough estimation of memory required for port:
> +     * XXX: rough estimation of number of mbufs required for this port:
>       * <packets required to fill the device rxqs>
>       * + <packets that could be stuck on other ports txqs>
>       * + <packets in the pmd threads>
>       * + <additional memory for corner cases>
>       */
> -    dmp->mp_size = dev->requested_n_rxq * dev->requested_rxq_size
> +    dmp->n_mbufs = dev->requested_n_rxq * dev->requested_rxq_size
>              + dev->requested_n_txq * dev->requested_txq_size
>              + MIN(RTE_MAX_LCORE, dev->requested_n_rxq) * NETDEV_MAX_BURST
>              + MIN_NB_MBUF;
> @@ -543,11 +543,11 @@ dpdk_mp_create(struct netdev_dpdk *dev, int mtu, bool *mp_exists)
>  
>          VLOG_DBG("Requesting a mempool of %u mbufs for netdev %s "
>                   "with %d Rx and %d Tx queues, socket id:%d.",
> -                 dmp->mp_size, dev->up.name,
> +                 dmp->n_mbufs, dev->up.name,
>                   dev->requested_n_rxq, dev->requested_n_txq,
>                   dev->requested_socket_id);
>  
> -        dmp->mp = rte_pktmbuf_pool_create(mp_name, dmp->mp_size,
> +        dmp->mp = rte_pktmbuf_pool_create(mp_name, dmp->n_mbufs,
>                                            MP_CACHE_SZ,
>                                            sizeof (struct dp_packet)
>                                                   - sizeof (struct rte_mbuf),
> @@ -556,7 +556,7 @@ dpdk_mp_create(struct netdev_dpdk *dev, int mtu, bool *mp_exists)
>                                            dmp->socket_id);
>          if (dmp->mp) {
>              VLOG_DBG("Allocated \"%s\" mempool with %u mbufs", mp_name,
> -                     dmp->mp_size);
> +                     dmp->n_mbufs);
>              /* rte_pktmbuf_pool_create has done some initialization of the
>               * rte_mbuf part of each dp_packet. Some OvS specific fields
>               * of the packet still need to be initialized by
> @@ -574,14 +574,14 @@ dpdk_mp_create(struct netdev_dpdk *dev, int mtu, bool *mp_exists)
>              *mp_exists = true;
>          } else {
>              VLOG_ERR("Failed mempool \"%s\" create request of %u mbufs",
> -                     mp_name, dmp->mp_size);
> +                     mp_name, dmp->n_mbufs);
>          }
>          free(mp_name);
>          if (dmp->mp) {
>              return dmp;
>          }
>      } while (!(*mp_exists) &&
> -            (rte_errno == ENOMEM && (dmp->mp_size /= 2) >= MIN_NB_MBUF));
> +            (rte_errno == ENOMEM && (dmp->n_mbufs /= 2) >= MIN_NB_MBUF));
>  
>      rte_free(dmp);
>      return NULL;
> 



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