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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2016-2018 Intel Corporation.
* Copyright(c) 2017-2018 Linaro Limited.
* Copyright(C) 2022 Marvell.
*/
#ifndef PKT_GROUP_H
#define PKT_GROUP_H
#define FWDSTEP 4
/*
* Group consecutive packets with the same destination port into one burst.
* To avoid extra latency this is done together with some other packet
* processing, but after we made a final decision about packet's destination.
* To do this we maintain:
* pnum - array of number of consecutive packets with the same dest port for
* each packet in the input burst.
* lp - pointer to the last updated element in the pnum.
* dlp - dest port value lp corresponds to.
*/
#define GRPSZ (1 << FWDSTEP)
#define GRPMSK (GRPSZ - 1)
#define GROUP_PORT_STEP(dlp, dcp, lp, pn, idx) do { \
if (likely((dlp) == (dcp)[(idx)])) { \
(lp)[0]++; \
} else { \
(dlp) = (dcp)[idx]; \
(lp) = (pn) + (idx); \
(lp)[0] = 1; \
} \
} while (0)
static const struct {
uint64_t pnum; /* prebuild 4 values for pnum[]. */
int32_t idx; /* index for new last updated elemnet. */
uint16_t lpv; /* add value to the last updated element. */
} gptbl[GRPSZ] = {
{
/* 0: a != b, b != c, c != d, d != e */
.pnum = UINT64_C(0x0001000100010001),
.idx = 4,
.lpv = 0,
},
{
/* 1: a == b, b != c, c != d, d != e */
.pnum = UINT64_C(0x0001000100010002),
.idx = 4,
.lpv = 1,
},
{
/* 2: a != b, b == c, c != d, d != e */
.pnum = UINT64_C(0x0001000100020001),
.idx = 4,
.lpv = 0,
},
{
/* 3: a == b, b == c, c != d, d != e */
.pnum = UINT64_C(0x0001000100020003),
.idx = 4,
.lpv = 2,
},
{
/* 4: a != b, b != c, c == d, d != e */
.pnum = UINT64_C(0x0001000200010001),
.idx = 4,
.lpv = 0,
},
{
/* 5: a == b, b != c, c == d, d != e */
.pnum = UINT64_C(0x0001000200010002),
.idx = 4,
.lpv = 1,
},
{
/* 6: a != b, b == c, c == d, d != e */
.pnum = UINT64_C(0x0001000200030001),
.idx = 4,
.lpv = 0,
},
{
/* 7: a == b, b == c, c == d, d != e */
.pnum = UINT64_C(0x0001000200030004),
.idx = 4,
.lpv = 3,
},
{
/* 8: a != b, b != c, c != d, d == e */
.pnum = UINT64_C(0x0002000100010001),
.idx = 3,
.lpv = 0,
},
{
/* 9: a == b, b != c, c != d, d == e */
.pnum = UINT64_C(0x0002000100010002),
.idx = 3,
.lpv = 1,
},
{
/* 0xa: a != b, b == c, c != d, d == e */
.pnum = UINT64_C(0x0002000100020001),
.idx = 3,
.lpv = 0,
},
{
/* 0xb: a == b, b == c, c != d, d == e */
.pnum = UINT64_C(0x0002000100020003),
.idx = 3,
.lpv = 2,
},
{
/* 0xc: a != b, b != c, c == d, d == e */
.pnum = UINT64_C(0x0002000300010001),
.idx = 2,
.lpv = 0,
},
{
/* 0xd: a == b, b != c, c == d, d == e */
.pnum = UINT64_C(0x0002000300010002),
.idx = 2,
.lpv = 1,
},
{
/* 0xe: a != b, b == c, c == d, d == e */
.pnum = UINT64_C(0x0002000300040001),
.idx = 1,
.lpv = 0,
},
{
/* 0xf: a == b, b == c, c == d, d == e */
.pnum = UINT64_C(0x0002000300040005),
.idx = 0,
.lpv = 4,
},
};
#endif /* PKT_GROUP_H */
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