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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/um/drivers/vector_transports.c
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@@ -1,7 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Copyright (C) 2017 - Cambridge Greys Limited
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  * Copyright (C) 2011 - 2014 Cisco Systems Inc
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- * Licensed under the GPL.
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  */
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 #include <linux/etherdevice.h>
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@@ -418,7 +418,7 @@
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 	return 0;
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 }
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-static int build_tap_transport_data(struct vector_private *vp)
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+static int build_hybrid_transport_data(struct vector_private *vp)
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 {
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 	if (uml_raw_enable_vnet_headers(vp->fds->rx_fd)) {
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 		vp->form_header = &raw_form_header;
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@@ -432,7 +432,7 @@
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 				NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GRO);
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 		netdev_info(
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 			vp->dev,
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-			"tap/raw: using vnet headers for tso and tx/rx checksum"
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+			"tap/raw hybrid: using vnet headers for tso and tx/rx checksum"
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 		);
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 	} else {
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 		return 0; /* do not try to enable tap too if raw failed */
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@@ -440,6 +440,38 @@
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 	if (uml_tap_enable_vnet_headers(vp->fds->tx_fd))
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 		return 0;
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 	return -1;
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+}
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+
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+static int build_tap_transport_data(struct vector_private *vp)
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+{
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+	/* "Pure" tap uses the same fd for rx and tx */
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+	if (uml_tap_enable_vnet_headers(vp->fds->tx_fd)) {
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+		vp->form_header = &raw_form_header;
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+		vp->verify_header = &raw_verify_header;
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+		vp->header_size = sizeof(struct virtio_net_hdr);
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+		vp->rx_header_size = sizeof(struct virtio_net_hdr);
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+		vp->dev->hw_features |=
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+			(NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GRO);
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+		vp->dev->features |=
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+			(NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
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+				NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GRO);
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+		netdev_info(
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+			vp->dev,
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+			"tap: using vnet headers for tso and tx/rx checksum"
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+		);
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+		return 0;
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+	}
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+	return -1;
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+}
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+
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+
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+static int build_bess_transport_data(struct vector_private *vp)
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+{
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+	vp->form_header = NULL;
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+	vp->verify_header = NULL;
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+	vp->header_size = 0;
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+	vp->rx_header_size = 0;
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+	return 0;
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 }
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 int build_transport_data(struct vector_private *vp)
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@@ -454,6 +486,10 @@
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 		return build_raw_transport_data(vp);
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 	if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
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 		return build_tap_transport_data(vp);
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+	if (strncmp(transport, TRANS_HYBRID, TRANS_HYBRID_LEN) == 0)
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+		return build_hybrid_transport_data(vp);
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+	if (strncmp(transport, TRANS_BESS, TRANS_BESS_LEN) == 0)
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+		return build_bess_transport_data(vp);
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 	return 0;
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 }
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