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i40e: check multi-bit state correctly

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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: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Jesse Brandeburg 2013-11-20 10:02:49 +00:00 committed by Jeff Kirsher
parent dcf8f55b15
commit 8a49492008
1 changed files with 9 additions and 7 deletions
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16
drivers/net/ethernet/intel/i40e/i40e_txrx.c
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@ -891,13 +891,15 @@ 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)
return le32_to_cpu(rx_desc->wb.qword0.hi_dword.rss);
}
return 0;
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;
}
/**