[v2,1/4] lpm: fix vector lookup for Arm
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Commit Message
rte_lpm_lookupx4 could return wrong next hop when more than 256 tbl8
groups are created. This is caused by incorrect type casting of tbl8
group index that been stored in tbl24 entry. The casting caused group
index truncation and hence wrong tbl8 group been searched.
Issue fixed by applying proper mask to tbl24 entry to get tbl8 group index.
Fixes: cbc2f1dccfba ("lpm/arm: support NEON")
Cc: jerinj@marvell.com
Cc: stable@dpdk.org
Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
Acked-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>
---
lib/librte_lpm/rte_lpm_neon.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
@@ -81,28 +81,28 @@ rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4],
if (unlikely((pt & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
i8.u32[0] = i8.u32[0] +
- (uint8_t)tbl[0] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
+ (tbl[0] & 0x00FFFFFF) * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[0]];
tbl[0] = *ptbl;
}
if (unlikely((pt >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
i8.u32[1] = i8.u32[1] +
- (uint8_t)tbl[1] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
+ (tbl[1] & 0x00FFFFFF) * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[1]];
tbl[1] = *ptbl;
}
if (unlikely((pt2 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
i8.u32[2] = i8.u32[2] +
- (uint8_t)tbl[2] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
+ (tbl[2] & 0x00FFFFFF) * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[2]];
tbl[2] = *ptbl;
}
if (unlikely((pt2 >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
i8.u32[3] = i8.u32[3] +
- (uint8_t)tbl[3] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
+ (tbl[3] & 0x00FFFFFF) * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[3]];
tbl[3] = *ptbl;
}