i40evf: Refactor VF RSS code
Refactor VF RSS code to allow RSS on a single queue and eliminate the need for the next_queue function. Change-ID: I9253bad96b7f542ee7036e15636db0e5d58d8ef2 Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com> Tested-by: Jim Young <james.m.young@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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@ -1435,41 +1435,22 @@ restart_watchdog:
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}
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/**
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* next_queue - increment to next available tx queue
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* @adapter: board private structure
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* @j: queue counter
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*
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* Helper function for RSS programming to increment through available
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* queus. Returns the next queue value.
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**/
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static int next_queue(struct i40evf_adapter *adapter, int j)
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{
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j += 1;
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return j >= adapter->num_active_queues ? 0 : j;
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}
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/**
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* i40evf_configure_rss - Prepare for RSS if used
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* i40evf_configure_rss - Prepare for RSS
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* @adapter: board private structure
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**/
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static void i40evf_configure_rss(struct i40evf_adapter *adapter)
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{
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u32 rss_key[I40E_VFQF_HKEY_MAX_INDEX + 1];
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struct i40e_hw *hw = &adapter->hw;
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u32 cqueue = 0;
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u32 lut = 0;
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int i, j;
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u64 hena;
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/* No RSS for single queue. */
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if (adapter->num_active_queues == 1) {
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wr32(hw, I40E_VFQF_HENA(0), 0);
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wr32(hw, I40E_VFQF_HENA(1), 0);
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return;
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}
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/* Hash type is configured by the PF - we just supply the key */
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netdev_rss_key_fill(rss_key, sizeof(rss_key));
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/* Fill out hash function seed */
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for (i = 0; i <= I40E_VFQF_HKEY_MAX_INDEX; i++)
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wr32(hw, I40E_VFQF_HKEY(i), rss_key[i]);
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@ -1479,16 +1460,14 @@ static void i40evf_configure_rss(struct i40evf_adapter *adapter)
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wr32(hw, I40E_VFQF_HENA(1), (u32)(hena >> 32));
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/* Populate the LUT with max no. of queues in round robin fashion */
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j = adapter->num_active_queues;
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for (i = 0; i <= I40E_VFQF_HLUT_MAX_INDEX; i++) {
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j = next_queue(adapter, j);
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lut = j;
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j = next_queue(adapter, j);
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lut |= j << 8;
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j = next_queue(adapter, j);
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lut |= j << 16;
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j = next_queue(adapter, j);
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lut |= j << 24;
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lut = 0;
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for (j = 0; j < 4; j++) {
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if (cqueue == adapter->vsi_res->num_queue_pairs)
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cqueue = 0;
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lut |= ((cqueue) << (8 * j));
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cqueue++;
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}
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wr32(hw, I40E_VFQF_HLUT(i), lut);
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}
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i40e_flush(hw);
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