Addressed copilot's review. Improved VDE RX

Author: danielinux

config.h

@@ -11,7 +11,7 @@
 #define MAX_TCPSOCKETS 4
 #define MAX_UDPSOCKETS 2
 #define MAX_ICMPSOCKETS 2
-#define RXBUF_SIZE (64 * 1024)
+#define RXBUF_SIZE (20 * 1024)
 #define TXBUF_SIZE (32 * 1024)
 
 #ifndef WOLFIP_POSIX_TCPDUMP

src/port/posix/bsd_socket.c

@@ -945,6 +945,9 @@ void poller_callback(int fd, uint16_t event, void *arg)
             wr = write(entry->pipe_write, &c, 1);
     }
     if (wr < 0 && errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR) {
+        /* Best-effort wakeup only: close/teardown races can invalidate the
+         * pipe while callbacks are still in flight, so hard errors are
+         * intentionally ignored here. */
     }
 }
 

src/port/vde2/vde_device.c

@@ -62,8 +62,8 @@ static int vde_poll(struct wolfIP_ll_dev *ll, void *buf, uint32_t len)
     pfd.fd = vde_datafd(vde_conn);
     pfd.events = POLLIN;
 
-    /* Poll with short timeout (2ms, same as TAP driver) */
-    ret = poll(&pfd, 1, 2);
+    /* Keep ll polling non-blocking to avoid adding per-call sleep latency. */
+    ret = poll(&pfd, 1, 0);
     if (ret < 0) {
         perror("vde_poll: poll");
         return -1;

src/wolfip.c

@@ -274,8 +274,6 @@ static int fifo_push(struct fifo *f, void *data, uint32_t len)
     memset(&desc, 0, sizeof(struct pkt_desc));
     /* Ensure 4-byte alignment in the buffer */
     head = fifo_align_head_pos(head, f->size);
-    if (head == tail && h_wrap == 0)
-        h_wrap = 0;
     {
         uint32_t space;
         if (head == tail && h_wrap == 0)