[dpdk-dev] [PATCH v2 3/3] app/testpmd: map anonymous memory for eth devices

[Shahaf Shuler <shahafs@mellanox.com>]

Mempools can be populated with anonymous memory when using command line
parameter --mp-alloc=anon.

Considering the mempools are going to be used by the net devices,
it is better to DMA map this memory.

This patch add such mapping now that we have the APIs in place[1].

[1] commit c33a675b6276 ("bus: introduce device level DMA memory mapping")

Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
---
 app/test-pmd/testpmd.c | 65 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index dd449a9859..3ad111a143 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -834,6 +834,63 @@ setup_extmem(uint32_t nb_mbufs, uint32_t mbuf_sz, bool huge)
 
 	return 0;
 }
+static void
+dma_unmap_cb(struct rte_mempool *mp __rte_unused, void *opaque __rte_unused,
+	     struct rte_mempool_memhdr *memhdr, unsigned mem_idx __rte_unused)
+{
+	uint16_t pid = 0;
+	int ret;
+
+	RTE_ETH_FOREACH_DEV(pid) {
+		struct rte_eth_dev *dev =
+			&rte_eth_devices[pid];
+
+		ret = rte_dev_dma_unmap(dev->device, memhdr->addr, 0,
+					memhdr->len);
+		if (ret) {
+			TESTPMD_LOG(DEBUG,
+				    "unable to DMA unmap addr 0x%p "
+				    "for device %s\n",
+				    memhdr->addr, dev->data->name);
+		}
+	}
+	ret = rte_extmem_unregister(memhdr->addr, memhdr->len);
+	if (ret) {
+		TESTPMD_LOG(DEBUG,
+			    "unable to un-register addr 0x%p\n", memhdr->addr);
+		return;
+	}
+}
+
+static void
+dma_map_cb(struct rte_mempool *mp __rte_unused, void *opaque __rte_unused,
+	   struct rte_mempool_memhdr *memhdr, unsigned mem_idx __rte_unused)
+{
+	uint16_t pid = 0;
+	size_t page_size = sysconf(_SC_PAGESIZE);
+	int ret;
+
+	ret = rte_extmem_register(memhdr->addr, memhdr->len, NULL, 0,
+				  page_size);
+	if (ret) {
+		TESTPMD_LOG(DEBUG,
+			    "unable to register addr 0x%p\n", memhdr->addr);
+		return;
+	}
+	RTE_ETH_FOREACH_DEV(pid) {
+		struct rte_eth_dev *dev =
+			&rte_eth_devices[pid];
+
+		ret = rte_dev_dma_map(dev->device, memhdr->addr, 0,
+				      memhdr->len);
+		if (ret) {
+			TESTPMD_LOG(DEBUG,
+				    "unable to DMA map addr 0x%p "
+				    "for device %s\n",
+				    memhdr->addr, dev->data->name);
+		}
+	}
+}
 
 /*
  * Configuration initialisation done once at init time.
@@ -879,6 +936,7 @@ mbuf_pool_create(uint16_t mbuf_seg_size, unsigned nb_mbuf,
 			}
 			rte_pktmbuf_pool_init(rte_mp, NULL);
 			rte_mempool_obj_iter(rte_mp, rte_pktmbuf_init, NULL);
+			rte_mempool_mem_iter(rte_mp, dma_map_cb, NULL);
 			break;
 		}
 	case MP_ALLOC_XMEM:
@@ -2410,6 +2468,13 @@ pmd_test_exit(void)
 	if (test_done == 0)
 		stop_packet_forwarding();
 
+	for (i = 0 ; i < RTE_MAX_NUMA_NODES ; i++) {
+		if (mempools[i]) {
+			if (mp_alloc_type == MP_ALLOC_ANON)
+				rte_mempool_mem_iter(mempools[i], dma_unmap_cb,
+						     NULL);
+		}
+	}
 	if (ports != NULL) {
 		no_link_check = 1;
 		RTE_ETH_FOREACH_DEV(pt_id) {
-- 
2.12.0