diff options
| author | Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> | 2018-01-07 21:36:36 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-01-08 21:58:49 +0300 |
| commit | c597897b08cb56e6a8b240245c074d43d1fde735 (patch) | |
| tree | 28c0be519ac9109d31cd256ddc0c10645c5feadd | |
| parent | 4e8683a95c963d766c7341eddbbc2d0c20022ebf (diff) | |
| download | linux-c597897b08cb56e6a8b240245c074d43d1fde735.tar.xz | |
net: qualcomm: rmnet: Define the MAPv4 packet formats
The MAPv4 packet format adds support for RX / TX checksum offload.
For a bi-directional UDP stream at a rate of 570 / 146 Mbps, roughly
10% CPU cycles are saved.
For receive path, there is a checksum trailer appended to the end of
the MAP packet. The valid field indicates if hardware has computed
the checksum. csum_start_offset indicates the offset from the start
of the IP header from which hardware has computed checksum.
csum_length is the number of bytes over which the checksum was
computed and the resulting value is csum_value.
In the transmit path, a header is appended between the end of the MAP
header and the start of the IP packet. csum_start_offset is the offset
in bytes from which hardware will compute the checksum if the
csum_enabled bit is set. udp_ip4_ind indicates if the checksum
value of 0 is valid or not. csum_insert_offset is the offset from the
csum_start_offset where hardware will insert the computed checksum.
The use of this additional packet format for checksum offload is
explained in subsequent patches.
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h | 16 | ||||
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_private.h | 2 |
2 files changed, 18 insertions, 0 deletions
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h index ef0eff247d9b..50c50cdc3e22 100644 --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h @@ -47,6 +47,22 @@ struct rmnet_map_header { u16 pkt_len; } __aligned(1); +struct rmnet_map_dl_csum_trailer { + u8 reserved1; + u8 valid:1; + u8 reserved2:7; + u16 csum_start_offset; + u16 csum_length; + __be16 csum_value; +} __aligned(1); + +struct rmnet_map_ul_csum_header { + __be16 csum_start_offset; + u16 csum_insert_offset:14; + u16 udp_ip4_ind:1; + u16 csum_enabled:1; +} __aligned(1); + #define RMNET_MAP_GET_MUX_ID(Y) (((struct rmnet_map_header *) \ (Y)->data)->mux_id) #define RMNET_MAP_GET_CD_BIT(Y) (((struct rmnet_map_header *) \ diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_private.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_private.h index d21428078504..de0143eaa05a 100644 --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_private.h +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_private.h @@ -21,6 +21,8 @@ /* Constants */ #define RMNET_INGRESS_FORMAT_DEAGGREGATION BIT(0) #define RMNET_INGRESS_FORMAT_MAP_COMMANDS BIT(1) +#define RMNET_INGRESS_FORMAT_MAP_CKSUMV4 BIT(2) +#define RMNET_EGRESS_FORMAT_MAP_CKSUMV4 BIT(3) /* Replace skb->dev to a virtual rmnet device and pass up the stack */ #define RMNET_EPMODE_VND (1) |