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IB/hfi1: Add functions to parse 9B headers

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These inline functions improve code readability by
enabling callers to read specific fields from the
header without knowledge of byte offsets.

Reviewed-by: Dennis Dalessandro <[email protected]>
Signed-off-by: Don Hiatt <[email protected]>
Signed-off-by: Dasaratharaman Chandramouli <[email protected]>
Signed-off-by: Dennis Dalessandro <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>
This commit is contained in:
Don Hiatt 2017-04-09 10:16:22 -07:00 • committed by Doug Ledford
commit cb42705792
9 changed files with 102 additions and 47 deletions
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60
include/rdma/ib_hdrs.h
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@ -181,4 +181,64 @@ static inline void put_ib_ateth_compare(u64 val, struct ib_atomic_eth *ateth)
ib_u64_put(val, &ateth->compare_data);
}
/*
* 9B/IB Packet Format
*/
#define IB_LNH_MASK 3
#define IB_SC_MASK 0xf
#define IB_SC_SHIFT 12
#define IB_SL_MASK 0xf
#define IB_SL_SHIFT 4
static inline u8 ib_get_lnh(struct ib_header *hdr)
{
return (be16_to_cpu(hdr->lrh[0]) & IB_LNH_MASK);
}
static inline u8 ib_get_sc(struct ib_header *hdr)
{
return ((be16_to_cpu(hdr->lrh[0]) >> IB_SC_SHIFT) & IB_SC_MASK);
}
static inline u8 ib_get_sl(struct ib_header *hdr)
{
return ((be16_to_cpu(hdr->lrh[0]) >> IB_SL_SHIFT) & IB_SL_MASK);
}
static inline u16 ib_get_dlid(struct ib_header *hdr)
{
return (be16_to_cpu(hdr->lrh[1]));
}
static inline u16 ib_get_slid(struct ib_header *hdr)
{
return (be16_to_cpu(hdr->lrh[3]));
}
/*
* BTH
*/
#define IB_BTH_OPCODE_MASK 0xff
#define IB_BTH_OPCODE_SHIFT 24
#define IB_BTH_PAD_MASK 3
#define IB_BTH_PKEY_MASK 0xffff
#define IB_BTH_PAD_SHIFT 20
static inline u8 ib_bth_get_pad(struct ib_other_headers *ohdr)
{
return ((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_PAD_SHIFT) &
IB_BTH_PAD_MASK);
}
static inline u16 ib_bth_get_pkey(struct ib_other_headers *ohdr)
{
return (be32_to_cpu(ohdr->bth[0]) & IB_BTH_PKEY_MASK);
}
static inline u8 ib_bth_get_opcode(struct ib_other_headers *ohdr)
{
return ((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_OPCODE_SHIFT) &
IB_BTH_OPCODE_MASK);
}
#endif /* IB_HDRS_H */