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Date: Fri, 5 Mar 2021 21:15:47 -0600
From: Alex Elder <elder@...aro.org>
To: subashab@...eaurora.org, stranche@...eaurora.org,
davem@...emloft.net, kuba@...nel.org
Cc: sharathv@...eaurora.org, bjorn.andersson@...aro.org,
evgreen@...omium.org, cpratapa@...eaurora.org, elder@...nel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next v2 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 <elder@...aro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
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 +74,13 @@ static void rmnet_map_send_ack(struct sk_buff *skb,
*/
void rmnet_map_command(struct sk_buff *skb, struct rmnet_port *port)
{
+ struct rmnet_map_header *map_header = (void *)skb->data;
struct rmnet_map_control_command *cmd;
unsigned char command_name;
unsigned char rc = 0;
- cmd = RMNET_MAP_GET_CMD_START(skb);
+ /* Command data immediately follows the MAP header */
+ cmd = (struct rmnet_map_control_command *)(map_header + 1);
command_name = cmd->command_name;
switch (command_name) {
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
index bd1aa11c9ce59..fd55269c2ce3c 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
@@ -321,7 +321,7 @@ struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb,
return NULL;
maph = (struct rmnet_map_header *)skb->data;
- packet_len = ntohs(maph->pkt_len) + sizeof(struct rmnet_map_header);
+ packet_len = ntohs(maph->pkt_len) + sizeof(*maph);
if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4)
packet_len += sizeof(struct rmnet_map_dl_csum_trailer);
@@ -330,7 +330,7 @@ struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb,
return NULL;
/* Some hardware can send us empty frames. Catch them */
- if (ntohs(maph->pkt_len) == 0)
+ if (!maph->pkt_len)
return NULL;
skbn = alloc_skb(packet_len + RMNET_MAP_DEAGGR_SPACING, GFP_ATOMIC);
--
2.27.0
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