[net-next 07/13] i40e: exit ATR mode only when adding TCP/IPv4 filter succeeds

[Jeff Kirsher]

From: Jacob Keller <jacob.e.kel...@intel.com>

Move ATR exit check after we have sent the TCP/IPv4 filter to the ring
successfully. This avoids an issue where we potentially update the
filter count without actually succeeding in adding the filter. Now, we
only increment the fd_tcp_rule after we've succeeded. Additionally, we
will re-enable ATR mode only after deletion of the filter is actually
posted to the FDIR ring.

Change-ID: If5c1dea422081cc5e2de65618b01b4c3bf6bd586
Signed-off-by: Jacob Keller <jacob.e.kel...@intel.com>
Reviewed-by: Mitch Williams <mitch.a.willi...@intel.com>
Tested-by: Andrew Bowers <andrewx.bow...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c | 34 ++++++++++++++---------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c 
b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 005257b4f218..05f3d0d5a004 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -284,23 +284,6 @@ static int i40e_add_del_fdir_tcpv4(struct i40e_vsi *vsi,
        ip->saddr = fd_data->src_ip;
        tcp->source = fd_data->src_port;
 
-       if (add) {
-               pf->fd_tcp_rule++;
-               if ((pf->flags & I40E_FLAG_FD_ATR_ENABLED) &&
-                   I40E_DEBUG_FD & pf->hw.debug_mask)
-                       dev_info(&pf->pdev->dev, "Forcing ATR off, sideband 
rules for TCP/IPv4 flow being applied\n");
-               pf->hw_disabled_flags |= I40E_FLAG_FD_ATR_ENABLED;
-       } else {
-               pf->fd_tcp_rule = (pf->fd_tcp_rule > 0) ?
-                                 (pf->fd_tcp_rule - 1) : 0;
-               if (pf->fd_tcp_rule == 0) {
-                       if ((pf->flags & I40E_FLAG_FD_ATR_ENABLED) &&
-                           I40E_DEBUG_FD & pf->hw.debug_mask)
-                               dev_info(&pf->pdev->dev, "ATR re-enabled due to 
no sideband TCP/IPv4 rules\n");
-                       pf->hw_disabled_flags &= ~I40E_FLAG_FD_ATR_ENABLED;
-               }
-       }
-
        fd_data->pctype = I40E_FILTER_PCTYPE_NONF_IPV4_TCP;
        ret = i40e_program_fdir_filter(fd_data, raw_packet, pf, add);
        if (ret) {
@@ -320,6 +303,23 @@ static int i40e_add_del_fdir_tcpv4(struct i40e_vsi *vsi,
                                 fd_data->pctype, fd_data->fd_id);
        }
 
+       if (add) {
+               pf->fd_tcp_rule++;
+               if ((pf->flags & I40E_FLAG_FD_ATR_ENABLED) &&
+                   I40E_DEBUG_FD & pf->hw.debug_mask)
+                       dev_info(&pf->pdev->dev, "Forcing ATR off, sideband 
rules for TCP/IPv4 flow being applied\n");
+               pf->hw_disabled_flags |= I40E_FLAG_FD_ATR_ENABLED;
+       } else {
+               pf->fd_tcp_rule = (pf->fd_tcp_rule > 0) ?
+                                 (pf->fd_tcp_rule - 1) : 0;
+               if (pf->fd_tcp_rule == 0) {
+                       if ((pf->flags & I40E_FLAG_FD_ATR_ENABLED) &&
+                           I40E_DEBUG_FD & pf->hw.debug_mask)
+                               dev_info(&pf->pdev->dev, "ATR re-enabled due to 
no sideband TCP/IPv4 rules\n");
+                       pf->hw_disabled_flags &= ~I40E_FLAG_FD_ATR_ENABLED;
+               }
+       }
+
        return 0;
 }
 
-- 
2.12.0