[PATCH] net/iavf: simplify mailbox message generation for mac

[David Marchand <david.marchand@redhat.com>]

Caught by code review.
The mailbox message maximum size is larger than the biggest message
to update mac addresses.
Remove the double loop and add some build / assert checks.

This cleanup also fixes a (never hit) issue where multiple mac addresses
would be marked as VIRTCHNL_ETHER_ADDR_PRIMARY if multiple messages had
been effectively sent.

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 drivers/net/iavf/iavf_vchnl.c | 86 ++++++++++++++---------------------
 1 file changed, 34 insertions(+), 52 deletions(-)

diff --git a/drivers/net/iavf/iavf_vchnl.c b/drivers/net/iavf/iavf_vchnl.c
index 065ab3594c..e5113605ac 100644
--- a/drivers/net/iavf/iavf_vchnl.c
+++ b/drivers/net/iavf/iavf_vchnl.c
@@ -1397,62 +1397,44 @@ void
 iavf_add_del_all_mac_addr(struct iavf_adapter *adapter, bool add)
 {
 	struct virtchnl_ether_addr_list *list;
+	char buf[sizeof(*list) + sizeof(struct virtchnl_ether_addr) * IAVF_NUM_MACADDR_MAX];
 	struct iavf_info *vf = IAVF_DEV_PRIVATE_TO_VF(adapter);
-	struct rte_ether_addr *addr;
 	struct iavf_cmd_info args;
-	int len, err, i, j;
-	int next_begin = 0;
-	int begin = 0;
-
-	do {
-		j = 0;
-		len = sizeof(struct virtchnl_ether_addr_list);
-		for (i = begin; i < IAVF_NUM_MACADDR_MAX; i++, next_begin++) {
-			addr = &adapter->dev_data->mac_addrs[i];
-			if (rte_is_zero_ether_addr(addr))
-				continue;
-			len += sizeof(struct virtchnl_ether_addr);
-			if (len >= IAVF_AQ_BUF_SZ) {
-				next_begin = i + 1;
-				break;
-			}
-		}
+	int len, i;
 
-		list = rte_zmalloc("iavf_del_mac_buffer", len, 0);
-		if (!list) {
-			PMD_DRV_LOG(ERR, "fail to allocate memory");
-			return;
-		}
+	RTE_BUILD_BUG_ON(sizeof(buf) > IAVF_AQ_BUF_SZ);
+	list = (struct virtchnl_ether_addr_list *)buf;
 
-		for (i = begin; i < next_begin; i++) {
-			addr = &adapter->dev_data->mac_addrs[i];
-			if (rte_is_zero_ether_addr(addr))
-				continue;
-			rte_memcpy(list->list[j].addr, addr->addr_bytes,
-				   sizeof(addr->addr_bytes));
-			list->list[j].type = (j == 0 ?
-					      VIRTCHNL_ETHER_ADDR_PRIMARY :
-					      VIRTCHNL_ETHER_ADDR_EXTRA);
-			PMD_DRV_LOG(DEBUG, "add/rm mac:" RTE_ETHER_ADDR_PRT_FMT,
-				    RTE_ETHER_ADDR_BYTES(addr));
-			j++;
-		}
-		list->vsi_id = vf->vsi_res->vsi_id;
-		list->num_elements = j;
-		args.ops = add ? VIRTCHNL_OP_ADD_ETH_ADDR :
-			   VIRTCHNL_OP_DEL_ETH_ADDR;
-		args.in_args = (uint8_t *)list;
-		args.in_args_size = len;
-		args.out_buffer = vf->aq_resp;
-		args.out_size = IAVF_AQ_BUF_SZ;
-		err = iavf_execute_vf_cmd_safe(adapter, &args, 0);
-		if (err)
-			PMD_DRV_LOG(ERR, "fail to execute command %s",
-				    add ? "OP_ADD_ETHER_ADDRESS" :
-				    "OP_DEL_ETHER_ADDRESS");
-		rte_free(list);
-		begin = next_begin;
-	} while (begin < IAVF_NUM_MACADDR_MAX);
+	len = sizeof(struct virtchnl_ether_addr_list);
+	for (i = 0; i < IAVF_NUM_MACADDR_MAX; i++) {
+		struct rte_ether_addr *addr;
+
+		addr = &adapter->dev_data->mac_addrs[i];
+		if (rte_is_zero_ether_addr(addr))
+			continue;
+		len += sizeof(struct virtchnl_ether_addr);
+		assert(len <= IAVF_AQ_BUF_SZ);
+
+		rte_memcpy(list->list[i].addr, addr->addr_bytes,
+			   sizeof(addr->addr_bytes));
+		list->list[i].type = (i == 0 ?
+				      VIRTCHNL_ETHER_ADDR_PRIMARY :
+				      VIRTCHNL_ETHER_ADDR_EXTRA);
+		PMD_DRV_LOG(DEBUG, "add/rm mac:" RTE_ETHER_ADDR_PRT_FMT,
+			    RTE_ETHER_ADDR_BYTES(addr));
+	}
+
+	list->vsi_id = vf->vsi_res->vsi_id;
+	list->num_elements = i;
+	args.ops = add ? VIRTCHNL_OP_ADD_ETH_ADDR : VIRTCHNL_OP_DEL_ETH_ADDR;
+	args.in_args = (uint8_t *)list;
+	args.in_args_size = len;
+	args.out_buffer = vf->aq_resp;
+	args.out_size = IAVF_AQ_BUF_SZ;
+
+	if (iavf_execute_vf_cmd_safe(adapter, &args, 0))
+		PMD_DRV_LOG(ERR, "fail to execute command %s",
+			    add ? "OP_ADD_ETHER_ADDRESS" : "OP_DEL_ETHER_ADDRESS");
 }
 
 int
-- 
2.46.2