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Commit 0db8fc47 authored by Sivan Reinstein's avatar Sivan Reinstein
Browse files

net: rmnet_data: add support for DL MAP based checksum offload 



Add DL checksum offload routines for MAPv3. Can bypass checksum software
for IPv4/IPv6 TCP/UDP protocols.

CRs-fixed: 692334
Change-Id: Ic13a5d9a1ebfdc57b6eb53ee93da92c3aee547b1
Signed-off-by: default avatarSivan Reinstein <sivanr@codeaurora.org>
parent 83dd8ec0

include/uapi/linux/rmnet_data.h

+1 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#define RMNET_INGRESS_FORMAT_DEAGGREGATION      (1<<2)

#define RMNET_INGRESS_FORMAT_DEMUXING           (1<<3)

#define RMNET_INGRESS_FORMAT_MAP_COMMANDS       (1<<4)

#define RMNET_INGRESS_FORMAT_MAP_CKSUMV3        (1<<5)



/* ***************** Netlink API ******************************************** */

#define RMNET_NETLINK_PROTO 31

net/rmnet_data/rmnet_data_handlers.c

+16 −0
Original line number Diff line number Diff line
@@ -255,6 +255,7 @@ static rx_handler_result_t _rmnet_map_ingress_handler(struct sk_buff *skb, 
	struct rmnet_logical_ep_conf_s *ep;

	uint8_t mux_id;

	uint16_t len;

	int ckresult;



	mux_id = RMNET_MAP_GET_MUX_ID(skb);

	len = RMNET_MAP_GET_LENGTH(skb)
@@ -281,6 +282,21 @@ static rx_handler_result_t _rmnet_map_ingress_handler(struct sk_buff *skb, 
	if (config->ingress_data_format & RMNET_INGRESS_FORMAT_DEMUXING)

		skb->dev = ep->egress_dev;



	if (config->ingress_data_format & RMNET_INGRESS_FORMAT_MAP_CKSUMV3) {

		ckresult = rmnet_map_checksum_downlink_packet(skb);

		trace_rmnet_map_checksum_downlink_packet(skb, ckresult);

		if (likely(ckresult == RMNET_MAP_CHECKSUM_OK))

			skb->ip_summed |= CHECKSUM_UNNECESSARY;

		else if (ckresult != RMNET_MAP_CHECKSUM_ERR_UNKNOWN_IP_VERSION

			&& ckresult != RMNET_MAP_CHECKSUM_ERR_UNKNOWN_TRANSPORT

			&& ckresult != RMNET_MAP_CHECKSUM_VALID_FLAG_NOT_SET

			&& ckresult != RMNET_MAP_CHECKSUM_FRAGMENTED_PACKET) {

			rmnet_kfree_skb(skb,

				RMNET_STATS_SKBFREE_INGRESS_BAD_MAP_CKSUM);

			return RX_HANDLER_CONSUMED;

		}

	}



	/* Subtract MAP header */

	skb_pull(skb, sizeof(struct rmnet_map_header_s));

	skb_trim(skb, len);

net/rmnet_data/rmnet_data_stats.h

+1 −0
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ enum rmnet_skb_free_e { 
	RMNET_STATS_SKBFREE_DEAGG_CLONE_FAIL,

	RMNET_STATS_SKBFREE_DEAGG_UNKOWN_IP_TYP,

	RMNET_STATS_SKBFREE_DEAGG_DATA_LEN_0,

	RMNET_STATS_SKBFREE_INGRESS_BAD_MAP_CKSUM,

	RMNET_STATS_SKBFREE_MAX

};

net/rmnet_data/rmnet_data_trace.h

+20 −0
Original line number Diff line number Diff line
@@ -200,6 +200,26 @@ TRACE_EVENT(rmnet_end_deaggregation, 
		__get_str(name), __entry->num)

)



TRACE_EVENT(rmnet_map_checksum_downlink_packet,



	TP_PROTO(struct sk_buff *skb, int ckresult),



	TP_ARGS(skb, ckresult),



	TP_STRUCT__entry(

		__string(name, skb->dev->name)

		__field(int, res)

	),



	TP_fast_assign(

		__assign_str(name, skb->dev->name);

		__entry->res = ckresult;

	),



	TP_printk("DL checksum on dev=%s, res: %d",

		__get_str(name), __entry->res)

)



#endif /* _RMNET_DATA_TRACE_H_ */



/* This part must be outside protection */

net/rmnet_data/rmnet_map.h

+25 −10
Original line number Diff line number Diff line
@@ -48,6 +48,22 @@ struct rmnet_map_control_command_s { 
	};

}  __aligned(1);



struct rmnet_map_dl_checksum_trailer_s {

	unsigned char  reserved_h;

#if defined(__LITTLE_ENDIAN_BITFIELD)

	unsigned char  valid:1;

	unsigned char  reserved_l:7;

#elif defined(__BIG_ENDIAN_BITFIELD)

	unsigned char  reserved_l:7;

	unsigned char  valid:1;

#else

#error "Please fix <asm/byteorder.h>"

#endif

	unsigned short checksum_start_offset;

	unsigned short checksum_length;

	unsigned short checksum_value;

} __aligned(1);



enum rmnet_map_results_e {

	RMNET_MAP_SUCCESS,

	RMNET_MAP_CONSUMED,
@@ -70,11 +86,12 @@ enum rmnet_map_checksum_errors_e { 
	RMNET_MAP_CHECKSUM_OK,

	RMNET_MAP_CHECKSUM_VALID_FLAG_NOT_SET,

	RMNET_MAP_CHECKSUM_VALIDATION_FAILED,

	RMNET_MAP_CHECKSUM_ERROR_UNKOWN,

	RMNET_MAP_CHECKSUM_ERROR_NOT_DATA_PACKET,

	RMNET_MAP_CHECKSUM_ERROR_BAD_BUFFER,

	RMNET_MAP_CHECKSUM_ERROR_UNKNOWN_IP_VERSION,

	RMNET_MAP_CHECKSUM_ERROR_UNKNOWN_TRANSPORT,

	RMNET_MAP_CHECKSUM_ERR_UNKOWN,

	RMNET_MAP_CHECKSUM_ERR_NOT_DATA_PACKET,

	RMNET_MAP_CHECKSUM_ERR_BAD_BUFFER,

	RMNET_MAP_CHECKSUM_ERR_UNKNOWN_IP_VERSION,

	RMNET_MAP_CHECKSUM_ERR_UNKNOWN_TRANSPORT,

	RMNET_MAP_CHECKSUM_FRAGMENTED_PACKET,

	/* This should always be the last element */

	RMNET_MAP_CHECKSUM_ENUM_LENGTH

};
@@ -93,11 +110,6 @@ enum rmnet_map_agg_state_e { 
	RMNET_MAP_TXFER_SCHEDULED

};



#define RMNET_MAP_P_ICMP4  0x01

#define RMNET_MAP_P_TCP    0x06

#define RMNET_MAP_P_UDP    0x11

#define RMNET_MAP_P_ICMP6  0x3a



#define RMNET_MAP_COMMAND_REQUEST     0

#define RMNET_MAP_COMMAND_ACK         1

#define RMNET_MAP_COMMAND_UNSUPPORTED 2
@@ -114,4 +126,7 @@ rx_handler_result_t rmnet_map_command(struct sk_buff *skb, 
void rmnet_map_aggregate(struct sk_buff *skb,

			 struct rmnet_phys_ep_conf_s *config);



int rmnet_map_checksum_downlink_packet(struct sk_buff *skb);





#endif /* _RMNET_MAP_H_ */