Replace the use of C bit-fields in the rmnet_map_ul_csum_header
structure with a single integral structure member, and use field
masks to encode or get values within that member.
Note that the previous C bit-fields were defined with CPU local
endianness. Their values were computed and then forecfully converted
to network byte order in rmnet_map_ipv4_ul_csum_header(). Simplify
that function, and properly define the new csum_info member as a big
endian value.
Make similar simplifications in rmnet_map_ipv6_ul_csum_header().
Signed-off-by: Alex Elder <el...@linaro.org>
---
.../net/ethernet/qualcomm/rmnet/rmnet_map.h | 9 ++--
.../ethernet/qualcomm/rmnet/rmnet_map_data.c | 50 ++++++++-----------
2 files changed, 26 insertions(+), 33 deletions(-)
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
index a56209645c81..f3231c26badd 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
@@ -60,11 +60,14 @@ struct rmnet_map_dl_csum_trailer {
struct rmnet_map_ul_csum_header {
__be16 csum_start_offset;
- u16 csum_insert_offset:14;
- u16 udp_ip4_ind:1;
- u16 csum_enabled:1;
+ __be16 csum_info; /* RMNET_MAP_UL_* */
} __aligned(1);
+/* NOTE: These field masks are defined in CPU byte order */
+#define RMNET_MAP_UL_CSUM_INSERT_FMASK GENMASK(13, 0)
+#define RMNET_MAP_UL_CSUM_UDP_FMASK GENMASK(14, 14) /* 0: IP; 1: UDP */
+#define RMNET_MAP_UL_CSUM_ENABLED_FMASK GENMASK(15, 15)
+
#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_data.c
b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
index 10d2d582a9ce..72b64114505a 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
@@ -207,22 +207,18 @@ rmnet_map_ipv4_ul_csum_header(void *iphdr,
struct rmnet_map_ul_csum_header *ul_header,
struct sk_buff *skb)
{
- struct iphdr *ip4h = (struct iphdr *)iphdr;
- __be16 *hdr = (__be16 *)ul_header, offset;
+ struct iphdr *ip4h = iphdr;
+ u16 offset;
+ u16 val;
- offset = htons((__force u16)(skb_transport_header(skb) -
- (unsigned char *)iphdr));
- ul_header->csum_start_offset = offset;
- ul_header->csum_insert_offset = skb->csum_offset;
- ul_header->csum_enabled = 1;
+ offset = skb_transport_header(skb) - (unsigned char *)iphdr;
+ ul_header->csum_start_offset = htons(offset);
+
+ val = u16_encode_bits(skb->csum_offset, RMNET_MAP_UL_CSUM_INSERT_FMASK);
+ val |= RMNET_MAP_UL_CSUM_ENABLED_FMASK;
if (ip4h->protocol == IPPROTO_UDP)
- ul_header->udp_ip4_ind = 1;
- else
- ul_header->udp_ip4_ind = 0;
-
- /* Changing remaining fields to network order */
- hdr++;
- *hdr = htons((__force u16)*hdr);
+ val |= RMNET_MAP_UL_CSUM_UDP_FMASK;
+ ul_header->csum_info = htons(val);
skb->ip_summed = CHECKSUM_NONE;
@@ -249,18 +245,16 @@ rmnet_map_ipv6_ul_csum_header(void *ip6hdr,
struct rmnet_map_ul_csum_header *ul_header,
struct sk_buff *skb)
{
- __be16 *hdr = (__be16 *)ul_header, offset;
+ u16 offset;
+ u16 val;
- offset = htons((__force u16)(skb_transport_header(skb) -
- (unsigned char *)ip6hdr));
- ul_header->csum_start_offset = offset;
- ul_header->csum_insert_offset = skb->csum_offset;
- ul_header->csum_enabled = 1;
- ul_header->udp_ip4_ind = 0;
+ offset = skb_transport_header(skb) - (unsigned char *)ip6hdr;
+ ul_header->csum_start_offset = htons(offset);
- /* Changing remaining fields to network order */
- hdr++;
- *hdr = htons((__force u16)*hdr);
+ val = u16_encode_bits(skb->csum_offset, RMNET_MAP_UL_CSUM_INSERT_FMASK);
+ val |= RMNET_MAP_UL_CSUM_ENABLED_FMASK;
+ /* Not UDP, so that field is 0 */
+ ul_header->csum_info = htons(val);
skb->ip_summed = CHECKSUM_NONE;
@@ -400,8 +394,7 @@ void rmnet_map_checksum_uplink_packet(struct sk_buff *skb,
struct rmnet_map_ul_csum_header *ul_header;
void *iphdr;
- ul_header = (struct rmnet_map_ul_csum_header *)
- skb_push(skb, sizeof(struct rmnet_map_ul_csum_header));
+ ul_header = skb_push(skb, sizeof(*ul_header));
if (unlikely(!(orig_dev->features &
(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))))
@@ -428,10 +421,7 @@ void rmnet_map_checksum_uplink_packet(struct sk_buff *skb,
}
sw_csum:
- ul_header->csum_start_offset = 0;
- ul_header->csum_insert_offset = 0;
- ul_header->csum_enabled = 0;
- ul_header->udp_ip4_ind = 0;
+ memset(ul_header, 0, sizeof(*ul_header));
priv->stats.csum_sw++;
}
--
2.20.1
