e1d9a90a9b
Adding support for processing of MAPv5 downlink packets. It involves parsing the Mapv5 packet and checking the csum header to know whether the hardware has validated the checksum and is valid or not. Based on the checksum valid bit the corresponding stats are incremented and skb->ip_summed is marked either CHECKSUM_UNNECESSARY or left as CHEKSUM_NONE to let network stack revalidate the checksum and update the respective snmp stats. Current MAPV1 header has been modified, the reserved field in the Mapv1 header is now used for next header indication. Signed-off-by: Sharath Chandra Vurukala <sharathv@codeaurora.org> Signed-off-by: David S. Miller <davem@davemloft.net>
73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only
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* Copyright (c) 2013-2019, 2021 The Linux Foundation. All rights reserved.
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*/
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#ifndef _LINUX_IF_RMNET_H_
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#define _LINUX_IF_RMNET_H_
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struct rmnet_map_header {
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u8 flags; /* MAP_CMD_FLAG, MAP_PAD_LEN_MASK */
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u8 mux_id;
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__be16 pkt_len; /* Length of packet, including pad */
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} __aligned(1);
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/* rmnet_map_header flags field:
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* PAD_LEN: number of pad bytes following packet data
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* CMD: 1 = packet contains a MAP command; 0 = packet contains data
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* NEXT_HEADER: 1 = packet contains V5 CSUM header 0 = no V5 CSUM header
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*/
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#define MAP_PAD_LEN_MASK GENMASK(5, 0)
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#define MAP_NEXT_HEADER_FLAG BIT(6)
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#define MAP_CMD_FLAG BIT(7)
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struct rmnet_map_dl_csum_trailer {
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u8 reserved1;
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u8 flags; /* MAP_CSUM_DL_VALID_FLAG */
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__be16 csum_start_offset;
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__be16 csum_length;
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__be16 csum_value;
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} __aligned(1);
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/* rmnet_map_dl_csum_trailer flags field:
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* VALID: 1 = checksum and length valid; 0 = ignore them
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*/
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#define MAP_CSUM_DL_VALID_FLAG BIT(0)
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struct rmnet_map_ul_csum_header {
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__be16 csum_start_offset;
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__be16 csum_info; /* MAP_CSUM_UL_* */
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} __aligned(1);
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/* csum_info field:
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* OFFSET: where (offset in bytes) to insert computed checksum
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* UDP: 1 = UDP checksum (zero checkum means no checksum)
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* ENABLED: 1 = checksum computation requested
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*/
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#define MAP_CSUM_UL_OFFSET_MASK GENMASK(13, 0)
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#define MAP_CSUM_UL_UDP_FLAG BIT(14)
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#define MAP_CSUM_UL_ENABLED_FLAG BIT(15)
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/* MAP CSUM headers */
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struct rmnet_map_v5_csum_header {
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u8 header_info;
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u8 csum_info;
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__be16 reserved;
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} __aligned(1);
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/* v5 header_info field
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* NEXT_HEADER: represents whether there is any next header
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* HEADER_TYPE: represents the type of this header
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*
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* csum_info field
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* CSUM_VALID_OR_REQ:
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* 1 = for UL, checksum computation is requested.
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* 1 = for DL, validated the checksum and has found it valid
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*/
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#define MAPV5_HDRINFO_NXT_HDR_FLAG BIT(0)
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#define MAPV5_HDRINFO_HDR_TYPE_FMASK GENMASK(7, 1)
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#define MAPV5_CSUMINFO_VALID_FLAG BIT(7)
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#define RMNET_MAP_HEADER_TYPE_CSUM_OFFLOAD 2
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#endif /* !(_LINUX_IF_RMNET_H_) */
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