[dpdk-dev] [PATCH v3 3/5] vhost: prepare memory regions addresses

[Marvin Liu]

Prepare memory regions guest physical addresses for vectorized data
path. These information will be utilized by SIMD instructions to find
matched region index.

Signed-off-by: Marvin Liu <yong.liu at intel.com>

diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 12b7699cf..a19fe9423 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -52,6 +52,8 @@
 
 #define ASYNC_MAX_POLL_SEG 255
 
+#define MAX_NREGIONS 8
+
 #define VHOST_MAX_ASYNC_IT (MAX_PKT_BURST * 2)
 #define VHOST_MAX_ASYNC_VEC (BUF_VECTOR_MAX * 2)
 
@@ -349,6 +351,11 @@ struct inflight_mem_info {
 	uint64_t	size;
 };
 
+struct mem_regions_range {
+	uint64_t regions_low_addrs[MAX_NREGIONS];
+	uint64_t regions_high_addrs[MAX_NREGIONS];
+};
+
 /**
  * Device structure contains all configuration information relating
  * to the device.
@@ -356,6 +363,7 @@ struct inflight_mem_info {
 struct virtio_net {
 	/* Frontend (QEMU) memory and memory region information */
 	struct rte_vhost_memory	*mem;
+	struct mem_regions_range *regions_range;
 	uint64_t		features;
 	uint64_t		protocol_features;
 	int			vid;
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 4deceb3e0..2d2a2a1a3 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -185,6 +185,11 @@ vhost_backend_cleanup(struct virtio_net *dev)
 		dev->inflight_info = NULL;
 	}
 
+	if (dev->regions_range) {
+		free(dev->regions_range);
+		dev->regions_range = NULL;
+	}
+
 	if (dev->slave_req_fd >= 0) {
 		close(dev->slave_req_fd);
 		dev->slave_req_fd = -1;
@@ -1230,6 +1235,27 @@ vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg,
 		}
 	}
 
+	RTE_BUILD_BUG_ON(VHOST_MEMORY_MAX_NREGIONS != 8);
+	if (dev->vectorized) {
+		if (dev->regions_range == NULL) {
+			dev->regions_range = calloc(1,
+					sizeof(struct mem_regions_range));
+			if (!dev->regions_range) {
+				VHOST_LOG_CONFIG(ERR,
+					"failed to alloc dev vectorized area\n");
+				return RTE_VHOST_MSG_RESULT_ERR;
+			}
+		}
+
+		for (i = 0; i < memory->nregions; i++) {
+			dev->regions_range->regions_low_addrs[i] =
+				memory->regions[i].guest_phys_addr;
+			dev->regions_range->regions_high_addrs[i] =
+				memory->regions[i].guest_phys_addr +
+				memory->regions[i].memory_size;
+		}
+	}
+
 	for (i = 0; i < dev->nr_vring; i++) {
 		struct vhost_virtqueue *vq = dev->virtqueue[i];
 
-- 
2.17.1