[spp] [PATCH] spp_vf: fix unexpected count up for bad request

[x-fn-spp@sl.ntt-tx.co.jp]

From: Hideyuki Yamashita <yamashita.hideyuki@po.ntt-tx.co.jp>

The num of ports is counted up while port is not added actually if it
is already reached to the defiend muximum number. This patch is to fix
the issue by rejecting the count up.

Signed-off-by: Hideyuki Yamashita <yamashita.hideyuki@po.ntt-tx.co.jp>
Signed-off-by: Naoki Takada <takada.naoki@lab.ntt.co.jp>
---
 src/vf/common/command_proc.c | 56 +++++++++++++++++++++++++++++++++++-
 1 file changed, 55 insertions(+), 1 deletion(-)

diff --git a/src/vf/common/command_proc.c b/src/vf/common/command_proc.c
index 0f99827..415a638 100644
--- a/src/vf/common/command_proc.c
+++ b/src/vf/common/command_proc.c
@@ -321,7 +321,55 @@ spp_update_component(
 	return ret;
 }
 
+/* Check if over the maximum num of rx and tx ports of component. */
+static int
+check_port_count(int component_type, enum spp_port_rxtx rxtx, int num_rx,
+								int num_tx)
+{
+	RTE_LOG(INFO, SPP_COMMAND_PROC, "port count, port_type=%d,"
+				" rx=%d, tx=%d\n", rxtx, num_rx, num_tx);
+	if (rxtx == SPP_PORT_RXTX_RX)
+		num_rx++;
+	else
+		num_tx++;
+	/* Add rx or tx port appointed in port_type. */
+	RTE_LOG(INFO, SPP_COMMAND_PROC, "Num of ports after count up,"
+				" port_type=%d, rx=%d, tx=%d\n",
+				rxtx, num_rx, num_tx);
+	switch (component_type) {
+	case SPP_COMPONENT_FORWARD:
+		if (num_rx > 1 || num_tx > 1)
+			return SPP_RET_NG;
+		break;
+
+	case SPP_COMPONENT_MERGE:
+		if (num_tx > 1)
+			return SPP_RET_NG;
+		break;
+
+	case SPP_COMPONENT_CLASSIFIER_MAC:
+		if (num_rx > 1)
+			return SPP_RET_NG;
+		break;
+
+	case SPP_COMPONENT_MIRROR:
+		if (num_rx > 1 || num_tx > 2)
+			return SPP_RET_NG;
+		break;
+
+	default:
+		/* Illegal component type. */
+		return SPP_RET_NG;
+	}
+
+	return SPP_RET_OK;
+}
+
 /* Port add or del to execute it */
+/**
+ * TODO(Ogasawara) The name `action` should be revised to be more
+ * appropriate one.
+ */
 static int
 spp_update_port(enum spp_command_action action,
 		const struct spp_port_index *port,
@@ -361,8 +409,14 @@ spp_update_port(enum spp_command_action action,
 
 	switch (action) {
 	case SPP_CMD_ACTION_ADD:
+		/* Check if over the maximum num of ports of component. */
+		if (check_port_count(comp_info->type, rxtx,
+				comp_info->num_rx_port,
+				comp_info->num_tx_port) != SPP_RET_OK)
+			return SPP_RET_NG;
+
 		ret_check = check_port_element(port_info, *num, ports);
-		/* registered check */
+		/* Check whether a port has been already registered. */
 		if (ret_check >= SPP_RET_OK) {
 			/* registered */
 			if (ability->ope == SPP_PORT_ABILITY_OPE_ADD_VLANTAG) {
-- 
2.17.1