From: Michael Brown <mcb30@ipxe.org>
Date: Tue, 24 Jun 2025 12:40:50 +0000 (+0100)
Subject: [legacy] Allocate extra padding in receive buffers
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0c02e0df8ae42b75b422f5df83c600a98d7cbc7;p=thirdparty%2Fipxe.git

[legacy] Allocate extra padding in receive buffers

Allow for legacy drivers that include VLAN tags or CRCs within their
received packets.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
---

diff --git a/src/drivers/net/legacy.c b/src/drivers/net/legacy.c
index 73a80194f..cde8c02d5 100644
--- a/src/drivers/net/legacy.c
+++ b/src/drivers/net/legacy.c
@@ -42,7 +42,8 @@ static void legacy_poll ( struct net_device *netdev ) {
 	struct nic *nic = netdev->priv;
 	struct io_buffer *iobuf;
 
-	iobuf = alloc_iob ( ETH_FRAME_LEN );
+	iobuf = alloc_iob ( ETH_FRAME_LEN + 4 /* possible VLAN */
+			    + 4 /* possible CRC */ );
 	if ( ! iobuf )
 		return;