+int
+ixgbe_dev_rss_hash_update(struct rte_eth_dev *dev,
+ struct rte_eth_rss_conf *rss_conf)
+{
+ struct ixgbe_hw *hw;
+ uint32_t mrqc;
+ uint16_t rss_hf;
+
+ hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+ /*
+ * Excerpt from section 7.1.2.8 Receive-Side Scaling (RSS):
+ * "RSS enabling cannot be done dynamically while it must be
+ * preceded by a software reset"
+ * Before changing anything, first check that the update RSS operation
+ * does not attempt to disable RSS, if RSS was enabled at
+ * initialization time, or does not attempt to enable RSS, if RSS was
+ * disabled at initialization time.
+ */
+ rss_hf = rss_conf->rss_hf;
+ mrqc = IXGBE_READ_REG(hw, IXGBE_MRQC);
+ if (!(mrqc & IXGBE_MRQC_RSSEN)) { /* RSS disabled */
+ if (rss_hf != 0) /* Enable RSS */
+ return -(EINVAL);
+ return 0; /* Nothing to do */
+ }
+ /* RSS enabled */
+ if (rss_hf == 0) /* Disable RSS */
+ return -(EINVAL);
+ ixgbe_hw_rss_hash_set(hw, rss_conf);
+ return 0;
+}
+
+static void
+ixgbe_rss_configure(struct rte_eth_dev *dev)
+{
+ struct rte_eth_rss_conf rss_conf;
+ struct ixgbe_hw *hw;
+ uint32_t reta;
+ uint16_t i;
+ uint16_t j;
+
+ PMD_INIT_FUNC_TRACE();
+ hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+ /*
+ * Fill in redirection table
+ * The byte-swap is needed because NIC registers are in
+ * little-endian order.
+ */
+ reta = 0;
+ for (i = 0, j = 0; i < 128; i++, j++) {
+ if (j == dev->data->nb_rx_queues)
+ j = 0;
+ reta = (reta << 8) | j;
+ if ((i & 3) == 3)
+ IXGBE_WRITE_REG(hw, IXGBE_RETA(i >> 2),
+ rte_bswap32(reta));
+ }
+
+ /*
+ * Configure the RSS key and the RSS protocols used to compute
+ * the RSS hash of input packets.
+ */
+ rss_conf = dev->data->dev_conf.rx_adv_conf.rss_conf;
+ if (rss_conf.rss_hf == 0) {
+ ixgbe_rss_disable(dev);
+ return;
+ }
+ if (rss_conf.rss_key == NULL)
+ rss_conf.rss_key = rss_intel_key; /* Default hash key */
+ ixgbe_hw_rss_hash_set(hw, &rss_conf);
+}
+