[ovs-dev] [PATCH v6 4/5] netdev-dpdk: Reword mp_size as n_mbufs.

Kavanagh, Mark B mark.b.kavanagh at intel.com
Tue Oct 17 13:35:27 UTC 2017


>From: Fischetti, Antonio
>Sent: Monday, October 16, 2017 2:15 PM
>To: dev at openvswitch.org
>Cc: Kavanagh, Mark B <mark.b.kavanagh at intel.com>; Loftus, Ciara
><ciara.loftus at intel.com>; Kevin Traynor <ktraynor at redhat.com>; Aaron Conole
><aconole at redhat.com>; Fischetti, Antonio <antonio.fischetti at intel.com>
>Subject: [PATCH v6 4/5] netdev-dpdk: Reword mp_size as n_mbufs.
>
>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.

Hey Antonio,

In retrospect, I guess that 'mempool_size' may not be as intuitive as 'number of mbufs', so I'm happy with this change.

Acked-by: Mark Kavanagh <mark.b.kavanagh at intel.com>

Thanks,
Mark


>
>CC: Mark B Kavanagh <mark.b.kavanagh at intel.com>
>CC: Ciara Loftus <ciara.loftus at intel.com>
>CC: Kevin Traynor <ktraynor at redhat.com>
>CC: Aaron Conole <aconole at redhat.com>
>Signed-off-by: Antonio Fischetti <antonio.fischetti at intel.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 dd5759b..5cf1392 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_ERR("Failed to generate a mempool name for \"%s\". "
>             "Hash:0x%x, mtu:%d, mbufs:%u, ret:%d",
>-            dmp->if_name, h, dmp->mtu, dmp->mp_size, ret);
>+            dmp->if_name, h, dmp->mtu, dmp->n_mbufs, 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;
>--
>2.4.11



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