netdev - [net-next 10/13] i40e: don't re-enable ATR when flushing filters if SB has TCP4/IPv4 rules

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Date:   Mon, 20 Mar 2017 16:47:09 -0700
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Jacob Keller <jacob.e.keller@...el.com>, netdev@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 10/13] i40e: don't re-enable ATR when flushing filters if SB has TCP4/IPv4 rules

From: Jacob Keller <jacob.e.keller@...el.com>

When flushing and replaying FDIR filters, it is possible we would
disable ATR, and then re-enable it even though we should have kept
it disabled due to existing TCP/IPv4 filters. Fix this by checking
whether we have TCP4/IPv4 filters before re-enabling.

Alternatively, we could instead restore ATR and then replay filters,
however, this would cause us to rapidly enable and then disable ATR in
some cases.

Change-ID: I076e4cc1e4409bce7f98f3c213295433a4ff43d8
Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
Reviewed-by: Avinash Dayanand <avinash.dayanand@...el.com>
Reviewed-by: Alan Brady <alan.brady@...el.com>
Reviewed-by: Mitch Williams <mitch.a.williams@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 437b79eeb8b5..cc33ac835181 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -6228,7 +6228,7 @@ static void i40e_fdir_flush_and_replay(struct i40e_pf *pf)
 	} else {
 		/* replay sideband filters */
 		i40e_fdir_filter_restore(pf->vsi[pf->lan_vsi]);
-		if (!disable_atr)
+		if (!disable_atr && !pf->fd_tcp_rule)
 			pf->hw_disabled_flags &= ~I40E_FLAG_FD_ATR_ENABLED;
 		clear_bit(__I40E_FD_FLUSH_REQUESTED, &pf->state);
 		if (I40E_DEBUG_FD & pf->hw.debug_mask)
-- 
2.12.0