Re: [PATCH net-next 3/6] net: qualcomm: rmnet: kill RMNET_MAP_GET_*() accessor macros
On Thu 04 Mar 16:34 CST 2021, Alex Elder wrote:
> The following macros, defined in "rmnet_map.h", assume a socket
> buffer is provided as an argument without any real indication this
> is the case.
> RMNET_MAP_GET_MUX_ID()
> RMNET_MAP_GET_CD_BIT()
> RMNET_MAP_GET_PAD()
> RMNET_MAP_GET_CMD_START()
> RMNET_MAP_GET_LENGTH()
> What they hide is pretty trivial accessing of fields in a structure,
> and it's much clearer to see this if we do these accesses directly.
>
> So rather than using these accessor macros, assign a local
> variable of the map header pointer type to the socket buffer data
> pointer, and derereference that pointer variable.
>
> In "rmnet_map_data.c", use sizeof(object) rather than sizeof(type)
> in one spot. Also,there's no need to byte swap 0; it's all zeros
> irrespective of endianness.
>
Reviewed-by: Bjorn Andersson
Regards,
Bjorn
> Signed-off-by: Alex Elder
> ---
> drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c | 10 ++
> drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h | 12
> .../net/ethernet/qualcomm/rmnet/rmnet_map_command.c | 11 ---
> drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c | 4 ++--
> 4 files changed, 16 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
> b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
> index 3d00b32323084..2a6b2a609884c 100644
> --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
> +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
> @@ -56,20 +56,22 @@ static void
> __rmnet_map_ingress_handler(struct sk_buff *skb,
> struct rmnet_port *port)
> {
> + struct rmnet_map_header *map_header = (void *)skb->data;
> struct rmnet_endpoint *ep;
> u16 len, pad;
> u8 mux_id;
>
> - if (RMNET_MAP_GET_CD_BIT(skb)) {
> + if (map_header->cd_bit) {
> + /* Packet contains a MAP command (not data) */
> if (port->data_format & RMNET_FLAGS_INGRESS_MAP_COMMANDS)
> return rmnet_map_command(skb, port);
>
> goto free_skb;
> }
>
> - mux_id = RMNET_MAP_GET_MUX_ID(skb);
> - pad = RMNET_MAP_GET_PAD(skb);
> - len = RMNET_MAP_GET_LENGTH(skb) - pad;
> + mux_id = map_header->mux_id;
> + pad = map_header->pad_len;
> + len = ntohs(map_header->pkt_len) - pad;
>
> if (mux_id >= RMNET_MAX_LOGICAL_EP)
> goto free_skb;
> diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
> b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
> index 576501db2a0bc..2aea153f42473 100644
> --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
> +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
> @@ -32,18 +32,6 @@ enum rmnet_map_commands {
> RMNET_MAP_COMMAND_ENUM_LENGTH
> };
>
> -#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 *) \
> - (Y)->data)->cd_bit)
> -#define RMNET_MAP_GET_PAD(Y) (((struct rmnet_map_header *) \
> - (Y)->data)->pad_len)
> -#define RMNET_MAP_GET_CMD_START(Y) ((struct rmnet_map_control_command *) \
> - ((Y)->data + \
> - sizeof(struct rmnet_map_header)))
> -#define RMNET_MAP_GET_LENGTH(Y) (ntohs(((struct rmnet_map_header *) \
> - (Y)->data)->pkt_len))
> -
> #define RMNET_MAP_COMMAND_REQUEST 0
> #define RMNET_MAP_COMMAND_ACK 1
> #define RMNET_MAP_COMMAND_UNSUPPORTED 2
> diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c
> b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c
> index beaee49621287..add0f5ade2e61 100644
> --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c
> +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c
> @@ -12,12 +12,13 @@ static u8 rmnet_map_do_flow_control(struct sk_buff *skb,
> struct rmnet_port *port,
> int enable)
> {
> + struct rmnet_map_header *map_header = (void *)skb->data;
> struct rmnet_endpoint *ep;
> struct net_device *vnd;
> u8 mux_id;
> int r;
>
> - mux_id = RMNET_MAP_GET_MUX_ID(skb);
> + mux_id = map_header->mux_id;
>
> if (mux_id >= RMNET_MAX_LOGICAL_EP) {
> kfree_skb(skb);
> @@ -49,6 +50,7 @@ static void rmnet_map_send_ack(struct sk_buff *skb,
> unsigned char type,
> struct rmnet_port *port)
> {
> + struct rmnet_map_header *map_header = (void *)skb->data;
> struct rmnet_map_control_command *cmd;
> struct net_device *dev = skb->dev;
>
> @@ -58,7 +60,8 @@ static void rmnet_map_send_ack(struct sk_buff *skb,
>
> skb->protocol = htons(ETH_P_MAP);
>
> - cmd =
[PATCH net-next 3/6] net: qualcomm: rmnet: kill RMNET_MAP_GET_*() accessor macros
The following macros, defined in "rmnet_map.h", assume a socket
buffer is provided as an argument without any real indication this
is the case.
RMNET_MAP_GET_MUX_ID()
RMNET_MAP_GET_CD_BIT()
RMNET_MAP_GET_PAD()
RMNET_MAP_GET_CMD_START()
RMNET_MAP_GET_LENGTH()
What they hide is pretty trivial accessing of fields in a structure,
and it's much clearer to see this if we do these accesses directly.
So rather than using these accessor macros, assign a local
variable of the map header pointer type to the socket buffer data
pointer, and derereference that pointer variable.
In "rmnet_map_data.c", use sizeof(object) rather than sizeof(type)
in one spot. Also,there's no need to byte swap 0; it's all zeros
irrespective of endianness.
Signed-off-by: Alex Elder
---
drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c | 10 ++
drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h | 12
.../net/ethernet/qualcomm/rmnet/rmnet_map_command.c | 11 ---
drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c | 4 ++--
4 files changed, 16 insertions(+), 21 deletions(-)
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
index 3d00b32323084..2a6b2a609884c 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
@@ -56,20 +56,22 @@ static void
__rmnet_map_ingress_handler(struct sk_buff *skb,
struct rmnet_port *port)
{
+ struct rmnet_map_header *map_header = (void *)skb->data;
struct rmnet_endpoint *ep;
u16 len, pad;
u8 mux_id;
- if (RMNET_MAP_GET_CD_BIT(skb)) {
+ if (map_header->cd_bit) {
+ /* Packet contains a MAP command (not data) */
if (port->data_format & RMNET_FLAGS_INGRESS_MAP_COMMANDS)
return rmnet_map_command(skb, port);
goto free_skb;
}
- mux_id = RMNET_MAP_GET_MUX_ID(skb);
- pad = RMNET_MAP_GET_PAD(skb);
- len = RMNET_MAP_GET_LENGTH(skb) - pad;
+ mux_id = map_header->mux_id;
+ pad = map_header->pad_len;
+ len = ntohs(map_header->pkt_len) - pad;
if (mux_id >= RMNET_MAX_LOGICAL_EP)
goto free_skb;
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
index 576501db2a0bc..2aea153f42473 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
@@ -32,18 +32,6 @@ enum rmnet_map_commands {
RMNET_MAP_COMMAND_ENUM_LENGTH
};
-#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 *) \
- (Y)->data)->cd_bit)
-#define RMNET_MAP_GET_PAD(Y) (((struct rmnet_map_header *) \
- (Y)->data)->pad_len)
-#define RMNET_MAP_GET_CMD_START(Y) ((struct rmnet_map_control_command *) \
- ((Y)->data + \
- sizeof(struct rmnet_map_header)))
-#define RMNET_MAP_GET_LENGTH(Y) (ntohs(((struct rmnet_map_header *) \
- (Y)->data)->pkt_len))
-
#define RMNET_MAP_COMMAND_REQUEST 0
#define RMNET_MAP_COMMAND_ACK 1
#define RMNET_MAP_COMMAND_UNSUPPORTED 2
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c
b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c
index beaee49621287..add0f5ade2e61 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c
@@ -12,12 +12,13 @@ static u8 rmnet_map_do_flow_control(struct sk_buff *skb,
struct rmnet_port *port,
int enable)
{
+ struct rmnet_map_header *map_header = (void *)skb->data;
struct rmnet_endpoint *ep;
struct net_device *vnd;
u8 mux_id;
int r;
- mux_id = RMNET_MAP_GET_MUX_ID(skb);
+ mux_id = map_header->mux_id;
if (mux_id >= RMNET_MAX_LOGICAL_EP) {
kfree_skb(skb);
@@ -49,6 +50,7 @@ static void rmnet_map_send_ack(struct sk_buff *skb,
unsigned char type,
struct rmnet_port *port)
{
+ struct rmnet_map_header *map_header = (void *)skb->data;
struct rmnet_map_control_command *cmd;
struct net_device *dev = skb->dev;
@@ -58,7 +60,8 @@ static void rmnet_map_send_ack(struct sk_buff *skb,
skb->protocol = htons(ETH_P_MAP);
- cmd = RMNET_MAP_GET_CMD_START(skb);
+ /* Command data immediately follows the MAP header */
+ cmd = (struct rmnet_map_control_command *)(map_header + 1);
cmd->cmd_type = type & 0x03;
netif_tx_lock(dev);
@@ -71,11 +7
