chnl: add chnl_port to get port from connected channel

Signed-off-by: Jalal Mostafa <jalal.a.mostapha@gmail.com>

lib/cnet/chnl/cnet_chnl.c

@@ -958,6 +958,21 @@ chnl_connect_common(struct chnl *ch, struct in_caddr *to, int32_t tolen __cne_un
     return 0;
 }
 
+/*
+ * Gets lport ID from channel descriptor. A use case is to allocate pktmbufs
+ * directly from the port mempool using `pktdev_buf_alloc`
+ */
+int
+chnl_port(int cd)
+{
+    struct chnl *ch = ch_get(cd);
+
+    if (!ch || !ch->ch_pcb || !ch->ch_pcb->netif)
+        return __errno_set(EFAULT);
+
+    return ch->ch_pcb->netif->lpid;
+}
+
 int
 chnl_validate_cb(const char *msg, struct chnl_buf *cb)
 {

lib/cnet/chnl/cnet_chnl.h

@@ -85,6 +85,16 @@ typedef enum {
  */
 CNDP_API void chnl_dump(const char *msg, struct chnl *ch);
 
+/**
+ * @brief Gets port of connect'd or bind'd channel
+ *
+ * @param cd
+ *   Channel descriptor
+ * @return
+ *   -1 on error or pktdev port ID on success
+ */
+CNDP_API int chnl_port(int cd);
+
 /**
  * @brief Common channel connect routine used by protocols.
  *