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* This is the 'wire' format for packets:
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* Request 1: netif_tx_request -- NETTXF_* (any flags)
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* [Request 2: netif_tx_extra] (only if request 1 has NETTXF_extra_info)
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* [Request 3: netif_tx_extra] (only if request 2 has XEN_NETIF_EXTRA_MORE)
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* Request 4: netif_tx_request -- NETTXF_more_data
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* Request 5: netif_tx_request -- NETTXF_more_data
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* Request 1: xen_netif_tx_request -- XEN_NETTXF_* (any flags)
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* [Request 2: xen_netif_extra_info] (only if request 1 has XEN_NETTXF_extra_info)
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* [Request 3: xen_netif_extra_info] (only if request 2 has XEN_NETIF_EXTRA_MORE)
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* Request 4: xen_netif_tx_request -- XEN_NETTXF_more_data
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* Request 5: xen_netif_tx_request -- XEN_NETTXF_more_data
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* Request N: netif_tx_request -- 0
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* Request N: xen_netif_tx_request -- 0
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/* Protocol checksum field is blank in the packet (hardware offload)? */
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#define _NETTXF_csum_blank (0)
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#define NETTXF_csum_blank (1U<<_NETTXF_csum_blank)
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#define _XEN_NETTXF_csum_blank (0)
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#define XEN_NETTXF_csum_blank (1U<<_XEN_NETTXF_csum_blank)
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/* Packet data has been validated against protocol checksum. */
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#define _NETTXF_data_validated (1)
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#define NETTXF_data_validated (1U<<_NETTXF_data_validated)
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#define _XEN_NETTXF_data_validated (1)
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#define XEN_NETTXF_data_validated (1U<<_XEN_NETTXF_data_validated)
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/* Packet continues in the next request descriptor. */
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#define _NETTXF_more_data (2)
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#define NETTXF_more_data (1U<<_NETTXF_more_data)
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#define _XEN_NETTXF_more_data (2)
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#define XEN_NETTXF_more_data (1U<<_XEN_NETTXF_more_data)
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/* Packet to be followed by extra descriptor(s). */
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#define _NETTXF_extra_info (3)
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#define NETTXF_extra_info (1U<<_NETTXF_extra_info)
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#define _XEN_NETTXF_extra_info (3)
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#define XEN_NETTXF_extra_info (1U<<_XEN_NETTXF_extra_info)
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struct xen_netif_tx_request {
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grant_ref_t gref; /* Reference to buffer page */
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uint16_t offset; /* Offset within buffer page */
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uint16_t flags; /* NETTXF_* */
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uint16_t flags; /* XEN_NETTXF_* */
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uint16_t id; /* Echoed in response message. */
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uint16_t size; /* Packet size in bytes. */
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/* Types of netif_extra_info descriptors. */
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#define XEN_NETIF_EXTRA_TYPE_NONE (0) /* Never used - invalid */
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#define XEN_NETIF_EXTRA_TYPE_GSO (1) /* u.gso */
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#define XEN_NETIF_EXTRA_TYPE_MAX (2)
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/* Types of xen_netif_extra_info descriptors. */
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#define XEN_NETIF_EXTRA_TYPE_NONE (0) /* Never used - invalid */
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#define XEN_NETIF_EXTRA_TYPE_GSO (1) /* u.gso */
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#define XEN_NETIF_EXTRA_TYPE_MAX (2)
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/* netif_extra_info flags. */
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#define _XEN_NETIF_EXTRA_FLAG_MORE (0)
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#define XEN_NETIF_EXTRA_FLAG_MORE (1U<<_XEN_NETIF_EXTRA_FLAG_MORE)
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/* xen_netif_extra_info flags. */
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#define _XEN_NETIF_EXTRA_FLAG_MORE (0)
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#define XEN_NETIF_EXTRA_FLAG_MORE (1U<<_XEN_NETIF_EXTRA_FLAG_MORE)
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/* GSO types - only TCPv4 currently supported. */
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#define XEN_NETIF_GSO_TYPE_TCPV4 (1)
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#define XEN_NETIF_GSO_TYPE_TCPV4 (1)
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* This structure needs to fit within both netif_tx_request and
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/* Packet data has been validated against protocol checksum. */
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#define _NETRXF_data_validated (0)
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#define NETRXF_data_validated (1U<<_NETRXF_data_validated)
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#define _XEN_NETRXF_data_validated (0)
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#define XEN_NETRXF_data_validated (1U<<_XEN_NETRXF_data_validated)
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/* Protocol checksum field is blank in the packet (hardware offload)? */
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#define _NETRXF_csum_blank (1)
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#define NETRXF_csum_blank (1U<<_NETRXF_csum_blank)
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#define _XEN_NETRXF_csum_blank (1)
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#define XEN_NETRXF_csum_blank (1U<<_XEN_NETRXF_csum_blank)
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/* Packet continues in the next request descriptor. */
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#define _NETRXF_more_data (2)
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#define NETRXF_more_data (1U<<_NETRXF_more_data)
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#define _XEN_NETRXF_more_data (2)
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#define XEN_NETRXF_more_data (1U<<_XEN_NETRXF_more_data)
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/* Packet to be followed by extra descriptor(s). */
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#define _NETRXF_extra_info (3)
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#define NETRXF_extra_info (1U<<_NETRXF_extra_info)
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#define _XEN_NETRXF_extra_info (3)
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#define XEN_NETRXF_extra_info (1U<<_XEN_NETRXF_extra_info)
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/* GSO Prefix descriptor. */
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#define _XEN_NETRXF_gso_prefix (4)
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#define XEN_NETRXF_gso_prefix (1U<<_XEN_NETRXF_gso_prefix)
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struct xen_netif_rx_response {
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uint16_t offset; /* Offset in page of start of received packet */
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uint16_t flags; /* NETRXF_* */
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uint16_t flags; /* XEN_NETRXF_* */
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int16_t status; /* -ve: BLKIF_RSP_* ; +ve: Rx'ed pkt size. */
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struct xen_netif_rx_request,
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struct xen_netif_rx_response);
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#define NETIF_RSP_DROPPED -2
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#define NETIF_RSP_ERROR -1
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#define NETIF_RSP_OKAY 0
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/* No response: used for auxiliary requests (e.g., netif_tx_extra). */
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#define NETIF_RSP_NULL 1
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#define XEN_NETIF_RSP_DROPPED -2
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#define XEN_NETIF_RSP_ERROR -1
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#define XEN_NETIF_RSP_OKAY 0
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/* No response: used for auxiliary requests (e.g., xen_netif_extra_info). */
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#define XEN_NETIF_RSP_NULL 1