[dpdk-dev] [PATCH 2/6] ethdev: add common function for reserving DMA regions

[Stephen Hemminger <stephen@networkplumber.org>]

The code to create aligned DMA regions was copy-n-pasted throughout
all the drivers. Since this code has to change now create a common
function that just does the right thing for Xen at runtime.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/librte_ether/rte_ethdev.c | 24 ++++++++++++++++++++++++
 lib/librte_ether/rte_ethdev.h | 23 +++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index f593f6e..6c520a3 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -2838,6 +2838,30 @@ rte_eth_dev_rx_intr_ctl(uint8_t port_id, int epfd, int op, void *data)
 
 	return 0;
 }
+ 
+const struct rte_memzone *
+rte_eth_dma_zone_reserve(const struct rte_eth_dev *dev, const char *ring_name,
+			 uint16_t queue_id, size_t size, unsigned align,
+			 int socket_id)
+{
+	char z_name[RTE_MEMZONE_NAMESIZE];
+	const struct rte_memzone *mz;
+
+	snprintf(z_name, sizeof(z_name), "%s_%s_%d_%d",
+		 dev->driver->pci_drv.name, ring_name,
+		 dev->data->port_id, queue_id);
+
+	mz = rte_memzone_lookup(z_name);
+	if (mz)
+		return mz;
+
+	if (is_xen_dom0_supported())
+		return rte_memzone_reserve_bounded(z_name, size, socket_id,
+						   0, align, RTE_PGSIZE_2M);
+	else
+		return rte_memzone_reserve_aligned(z_name, size, socket_id,
+						   0, align);
+}
 
 int
 rte_eth_dev_rx_intr_ctl_q(uint8_t port_id, uint16_t queue_id,
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 8a8c82b..8d2098d 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -3598,6 +3598,29 @@ extern int rte_eth_timesync_read_rx_timestamp(uint8_t port_id,
 extern int rte_eth_timesync_read_tx_timestamp(uint8_t port_id,
 					      struct timespec *timestamp);
 
+/**
+ * Create memzone for HW rings.
+ * malloc can't be used as the physical address is needed.
+ * If the memzone is already created, then this function returns a ptr
+ * to the old one.
+ *
+ * @param eth_dev
+ *   The *eth_dev* pointer is the address of the *rte_eth_dev* structure
+ * @param name
+ *   The name of the memory zone
+ * @param queue_id
+ *   The index of the queue to add to name
+ * @param size
+ *   The sizeof of the memory area
+ * @param align
+ *   Alignment for resulting memzone. Must be a power of 2.
+ * @param socket_id
+ *   The *socket_id* argument is the socket identifier in case of NUMA.
+ */
+const struct rte_memzone *
+rte_eth_dma_zone_reserve(const struct rte_eth_dev *eth_dev, const char *name,
+			 uint16_t queue_id, size_t size,
+			 unsigned align, int socket_id);
 #ifdef __cplusplus
 }
 #endif
-- 
2.1.4