Commit 8a494920 authored by Jesse Brandeburg's avatar Jesse Brandeburg Committed by Jeff Kirsher

i40e: check multi-bit state correctly

The hash is reported correctly in the rss field if and only if
the filter status is 3.  Other values of filter status mean
different things and we shouldn't depend on a bitwise result.

The issue was that
a & b --> returns true for b={1,2,3}
the fix is
a & b == b

Also refactor this function to use constant operations because we
are in fast path.

Change-Id: I4e29be87439c1cf8b60bc31bea29dff89596c013
Signed-off-by: default avatarJesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: default avatarKavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent dcf8f55b
......@@ -891,12 +891,14 @@ static inline void i40e_rx_checksum(struct i40e_vsi *vsi,
static inline u32 i40e_rx_hash(struct i40e_ring *ring,
union i40e_rx_desc *rx_desc)
{
if (ring->netdev->features & NETIF_F_RXHASH) {
if ((le64_to_cpu(rx_desc->wb.qword1.status_error_len) >>
I40E_RX_DESC_STATUS_FLTSTAT_SHIFT) &
I40E_RX_DESC_FLTSTAT_RSS_HASH)
const __le64 rss_mask =
cpu_to_le64((u64)I40E_RX_DESC_FLTSTAT_RSS_HASH <<
I40E_RX_DESC_STATUS_FLTSTAT_SHIFT);
if ((ring->netdev->features & NETIF_F_RXHASH) &&
(rx_desc->wb.qword1.status_error_len & rss_mask) == rss_mask)
return le32_to_cpu(rx_desc->wb.qword0.hi_dword.rss);
}
else
return 0;
}
......
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