Currently, iotlb cache name is comprised of vid and virtqueue index. For example, "iotlb_cache_0_0". Because vid is assigned per process, iotlb cache name is not unique among multi processes. For example a secondary process uses a vhost (ex. eth_vhost0,iface=/tmp/sock0) and another secondary process uses a vhost (ex. eth_vhost1,iface=/tmp/sock1), iotlb cache name of both vhost ("iotlb_cache_0_0") are same and as a result iotlb cache is broken.
This patch makes iotlb cache name unique among milti processes by using the interface name not vid to comprise iotlb cache name. Since the length of interface name is variable, this patch uses hash value calculated by the interface name. Fixes: d012d1f293f4 (vhost: add IOTLB helper functions) Cc: sta...@dpdk.org Signed-off-by: Itsuro Oda <o...@valinux.co.jp> --- lib/librte_vhost/iotlb.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/lib/librte_vhost/iotlb.c b/lib/librte_vhost/iotlb.c index bc1758528..0992c145b 100644 --- a/lib/librte_vhost/iotlb.c +++ b/lib/librte_vhost/iotlb.c @@ -6,6 +6,7 @@ #include <numaif.h> #endif +#include <rte_jhash.h> #include <rte_tailq.h> #include "iotlb.h" @@ -288,6 +289,7 @@ vhost_user_iotlb_init(struct virtio_net *dev, int vq_index) char pool_name[RTE_MEMPOOL_NAMESIZE]; struct vhost_virtqueue *vq = dev->virtqueue[vq_index]; int socket = 0; + uint32_t val; if (vq->iotlb_pool) { /* @@ -308,8 +310,10 @@ vhost_user_iotlb_init(struct virtio_net *dev, int vq_index) TAILQ_INIT(&vq->iotlb_list); TAILQ_INIT(&vq->iotlb_pending_list); - snprintf(pool_name, sizeof(pool_name), "iotlb_cache_%d_%d", - dev->vid, vq_index); + val = rte_jhash(dev->ifname, strlen(dev->ifname), 0); + snprintf(pool_name, sizeof(pool_name), "iotlb_cache_%08x_%d", + val, vq_index); + VHOST_LOG_CONFIG(DEBUG, "IOTLB cache name: %s\n", pool_name); /* If already created, free it and recreate */ vq->iotlb_pool = rte_mempool_lookup(pool_name); -- 2.17.0