[dpdk-dev] ixgbe_recv_scattered_pkts_vec split_flags question
Zoltan Kiss
zoltan.kiss at linaro.org
Tue Jul 21 17:09:59 CEST 2015
Hi,
I have a question regarding split_flags in this question. It's defined
as an array of 1 byte unsigned ints:
uint8_t split_flags[RTE_IXGBE_VPMD_RX_BURST] = {0};
RTE_IXGBE_VPMD_RX_BURST is 32, so it will be 32 bytes. Then we cast it
into a pointer for 4 byte values, and check the first 4 elements of that
array
const uint32_t *split_fl32 = (uint32_t *)split_flags;
if (rxq->pkt_first_seg == NULL &&
split_fl32[0] == 0 && split_fl32[1] == 0 &&
split_fl32[2] == 0 && split_fl32[3] == 0)
So we only check the first half of this 32 byte array. But
_recv_raw_pkts_vec() seems to use the whole array. Is this a bug or a
feature? Or am I mistaken in the math somewhere?
Regards,
Zoltan Kiss
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