drivers/net: fix memzone allocations for DMA memory

[ upstream commit d07fc02 ]

Caught by code review.

Using a random name for memzone allocations can result in init failures
in the unlikely case that a name collision occurs.
Use a simple sequential generator on 64 bits.

Fixes: 3f50f07 ("i40e: fix memzone freeing")
Fixes: 22b123a ("net/avf: initialize PMD")
Fixes: 5f0978e ("net/ice/base: add OS specific implementation")
Fixes: 737f30e ("net/hns3: support command interface with firmware")

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Min Hu (Connor) <humin29@huawei.com>
Acked-by: Haiyue Wang <haiyue.wang@intel.com>

drivers/net/hns3/hns3_cmd.c

@@ -59,10 +59,12 @@ static int
 hns3_allocate_dma_mem(struct hns3_hw *hw, struct hns3_cmq_ring *ring,
 		      uint64_t size, uint32_t alignment)
 {
+	static uint64_t hns3_dma_memzone_id;
 	const struct rte_memzone *mz = NULL;
 	char z_name[RTE_MEMZONE_NAMESIZE];
 
-	snprintf(z_name, sizeof(z_name), "hns3_dma_%" PRIu64, rte_rand());
+	snprintf(z_name, sizeof(z_name), "hns3_dma_%" PRIu64,
+		__atomic_fetch_add(&hns3_dma_memzone_id, 1, __ATOMIC_RELAXED));
 	mz = rte_memzone_reserve_bounded(z_name, size, SOCKET_ID_ANY,
 					 RTE_MEMZONE_IOVA_CONTIG, alignment,
 					 RTE_PGSIZE_2M);

drivers/net/i40e/i40e_ethdev.c

@@ -4604,13 +4604,15 @@ i40e_allocate_dma_mem_d(__attribute__((unused)) struct i40e_hw *hw,
 			u64 size,
 			u32 alignment)
 {
+	static uint64_t i40e_dma_memzone_id;
 	const struct rte_memzone *mz = NULL;
 	char z_name[RTE_MEMZONE_NAMESIZE];
 
 	if (!mem)
 		return I40E_ERR_PARAM;
 
-	snprintf(z_name, sizeof(z_name), "i40e_dma_%"PRIu64, rte_rand());
+	snprintf(z_name, sizeof(z_name), "i40e_dma_%" PRIu64,
+		__atomic_fetch_add(&i40e_dma_memzone_id, 1, __ATOMIC_RELAXED));
 	mz = rte_memzone_reserve_bounded(z_name, size, SOCKET_ID_ANY,
 			RTE_MEMZONE_IOVA_CONTIG, alignment, RTE_PGSIZE_2M);
 	if (!mz)

drivers/net/iavf/iavf_ethdev.c

@@ -1544,13 +1544,15 @@ iavf_allocate_dma_mem_d(__rte_unused struct iavf_hw *hw,
 		       u64 size,
 		       u32 alignment)
 {
+	static uint64_t iavf_dma_memzone_id;
 	const struct rte_memzone *mz = NULL;
 	char z_name[RTE_MEMZONE_NAMESIZE];
 
 	if (!mem)
 		return IAVF_ERR_PARAM;
 
-	snprintf(z_name, sizeof(z_name), "iavf_dma_%"PRIu64, rte_rand());
+	snprintf(z_name, sizeof(z_name), "iavf_dma_%" PRIu64,
+		__atomic_fetch_add(&iavf_dma_memzone_id, 1, __ATOMIC_RELAXED));
 	mz = rte_memzone_reserve_bounded(z_name, size, SOCKET_ID_ANY,
 			RTE_MEMZONE_IOVA_CONTIG, alignment, RTE_PGSIZE_2M);
 	if (!mz)

drivers/net/ice/base/ice_osdep.h

@@ -21,7 +21,6 @@
 #include <rte_cycles.h>
 #include <rte_spinlock.h>
 #include <rte_log.h>
-#include <rte_random.h>
 #include <rte_io.h>
 
 #include "ice_alloc.h"
@@ -241,13 +240,15 @@ static inline void *
 ice_alloc_dma_mem(__attribute__((unused)) struct ice_hw *hw,
 		  struct ice_dma_mem *mem, u64 size)
 {
+	static uint64_t ice_dma_memzone_id;
 	const struct rte_memzone *mz = NULL;
 	char z_name[RTE_MEMZONE_NAMESIZE];
 
 	if (!mem)
 		return NULL;
 
-	snprintf(z_name, sizeof(z_name), "ice_dma_%"PRIu64, rte_rand());
+	snprintf(z_name, sizeof(z_name), "ice_dma_%" PRIu64,
+		__atomic_fetch_add(&ice_dma_memzone_id, 1, __ATOMIC_RELAXED));
 	mz = rte_memzone_reserve_bounded(z_name, size, SOCKET_ID_ANY, 0,
 					 0, RTE_PGSIZE_2M);
 	if (!mz)