+/**
+ * Receive Side Scaling (RSS)
+ *
+ * Principles:
+ * The source and destination IP addresses of the IP header and the source
+ * and destination ports of TCP/UDP headers, if any, of received packets are
+ * hashed against a configurable random key to compute a 32-bit RSS hash result.
+ * The seven (7) LSBs of the 32-bit hash result are used as an index into a
+ * 128-entry redirection table (RETA). Each entry of the RETA provides a 3-bit
+ * RSS output index which is used as the Rx queue index where to store the
+ * received packets.
+ * The following output is supplied in the Rx write-back descriptor:
+ * - 32-bit result of the Microsoft RSS hash function,
+ * - 4-bit RSS type field.
+ */
+
+/*
+ * Used as the default key.
+ */
+static uint8_t rss_intel_key[40] = {
+ 0x6D, 0x5A, 0x56, 0xDA, 0x25, 0x5B, 0x0E, 0xC2,
+ 0x41, 0x67, 0x25, 0x3D, 0x43, 0xA3, 0x8F, 0xB0,
+ 0xD0, 0xCA, 0x2B, 0xCB, 0xAE, 0x7B, 0x30, 0xB4,
+ 0x77, 0xCB, 0x2D, 0xA3, 0x80, 0x30, 0xF2, 0x0C,
+ 0x6A, 0x42, 0xB7, 0x3B, 0xBE, 0xAC, 0x01, 0xFA,
+};
+
+static void
+ngbe_rss_disable(struct rte_eth_dev *dev)
+{
+ struct ngbe_hw *hw = ngbe_dev_hw(dev);
+
+ wr32m(hw, NGBE_RACTL, NGBE_RACTL_RSSENA, 0);
+}
+
+int
+ngbe_dev_rss_hash_update(struct rte_eth_dev *dev,
+ struct rte_eth_rss_conf *rss_conf)
+{
+ struct ngbe_hw *hw = ngbe_dev_hw(dev);
+ uint8_t *hash_key;
+ uint32_t mrqc;
+ uint32_t rss_key;
+ uint64_t rss_hf;
+ uint16_t i;
+
+ if (!hw->is_pf) {
+ PMD_DRV_LOG(ERR, "RSS hash update is not supported on this "
+ "NIC.");
+ return -ENOTSUP;
+ }
+
+ hash_key = rss_conf->rss_key;
+ if (hash_key) {
+ /* Fill in RSS hash key */
+ for (i = 0; i < 10; i++) {
+ rss_key = LS32(hash_key[(i * 4) + 0], 0, 0xFF);
+ rss_key |= LS32(hash_key[(i * 4) + 1], 8, 0xFF);
+ rss_key |= LS32(hash_key[(i * 4) + 2], 16, 0xFF);
+ rss_key |= LS32(hash_key[(i * 4) + 3], 24, 0xFF);
+ wr32a(hw, NGBE_REG_RSSKEY, i, rss_key);
+ }
+ }
+
+ /* Set configured hashing protocols */
+ rss_hf = rss_conf->rss_hf & NGBE_RSS_OFFLOAD_ALL;
+
+ mrqc = rd32(hw, NGBE_RACTL);
+ mrqc &= ~NGBE_RACTL_RSSMASK;
+ if (rss_hf & RTE_ETH_RSS_IPV4)
+ mrqc |= NGBE_RACTL_RSSIPV4;
+ if (rss_hf & RTE_ETH_RSS_NONFRAG_IPV4_TCP)
+ mrqc |= NGBE_RACTL_RSSIPV4TCP;
+ if (rss_hf & RTE_ETH_RSS_IPV6 ||
+ rss_hf & RTE_ETH_RSS_IPV6_EX)
+ mrqc |= NGBE_RACTL_RSSIPV6;
+ if (rss_hf & RTE_ETH_RSS_NONFRAG_IPV6_TCP ||
+ rss_hf & RTE_ETH_RSS_IPV6_TCP_EX)
+ mrqc |= NGBE_RACTL_RSSIPV6TCP;
+ if (rss_hf & RTE_ETH_RSS_NONFRAG_IPV4_UDP)
+ mrqc |= NGBE_RACTL_RSSIPV4UDP;
+ if (rss_hf & RTE_ETH_RSS_NONFRAG_IPV6_UDP ||
+ rss_hf & RTE_ETH_RSS_IPV6_UDP_EX)
+ mrqc |= NGBE_RACTL_RSSIPV6UDP;
+
+ if (rss_hf)
+ mrqc |= NGBE_RACTL_RSSENA;
+ else
+ mrqc &= ~NGBE_RACTL_RSSENA;
+
+ wr32(hw, NGBE_RACTL, mrqc);
+
+ return 0;
+}
+
+int
+ngbe_dev_rss_hash_conf_get(struct rte_eth_dev *dev,
+ struct rte_eth_rss_conf *rss_conf)
+{
+ struct ngbe_hw *hw = ngbe_dev_hw(dev);
+ uint8_t *hash_key;
+ uint32_t mrqc;
+ uint32_t rss_key;
+ uint64_t rss_hf;
+ uint16_t i;
+
+ hash_key = rss_conf->rss_key;
+ if (hash_key) {
+ /* Return RSS hash key */
+ for (i = 0; i < 10; i++) {
+ rss_key = rd32a(hw, NGBE_REG_RSSKEY, i);
+ hash_key[(i * 4) + 0] = RS32(rss_key, 0, 0xFF);
+ hash_key[(i * 4) + 1] = RS32(rss_key, 8, 0xFF);
+ hash_key[(i * 4) + 2] = RS32(rss_key, 16, 0xFF);
+ hash_key[(i * 4) + 3] = RS32(rss_key, 24, 0xFF);
+ }
+ }
+
+ rss_hf = 0;
+
+ mrqc = rd32(hw, NGBE_RACTL);
+ if (mrqc & NGBE_RACTL_RSSIPV4)
+ rss_hf |= RTE_ETH_RSS_IPV4;
+ if (mrqc & NGBE_RACTL_RSSIPV4TCP)
+ rss_hf |= RTE_ETH_RSS_NONFRAG_IPV4_TCP;
+ if (mrqc & NGBE_RACTL_RSSIPV6)
+ rss_hf |= RTE_ETH_RSS_IPV6 |
+ RTE_ETH_RSS_IPV6_EX;
+ if (mrqc & NGBE_RACTL_RSSIPV6TCP)
+ rss_hf |= RTE_ETH_RSS_NONFRAG_IPV6_TCP |
+ RTE_ETH_RSS_IPV6_TCP_EX;
+ if (mrqc & NGBE_RACTL_RSSIPV4UDP)
+ rss_hf |= RTE_ETH_RSS_NONFRAG_IPV4_UDP;
+ if (mrqc & NGBE_RACTL_RSSIPV6UDP)
+ rss_hf |= RTE_ETH_RSS_NONFRAG_IPV6_UDP |
+ RTE_ETH_RSS_IPV6_UDP_EX;
+ if (!(mrqc & NGBE_RACTL_RSSENA))
+ rss_hf = 0;
+
+ rss_hf &= NGBE_RSS_OFFLOAD_ALL;
+
+ rss_conf->rss_hf = rss_hf;
+ return 0;
+}
+
+static void
+ngbe_rss_configure(struct rte_eth_dev *dev)
+{
+ struct rte_eth_rss_conf rss_conf;
+ struct ngbe_adapter *adapter = ngbe_dev_adapter(dev);
+ struct ngbe_hw *hw = ngbe_dev_hw(dev);
+ uint32_t reta;
+ uint16_t i;
+ uint16_t j;
+
+ PMD_INIT_FUNC_TRACE();
+
+ /*
+ * Fill in redirection table
+ * The byte-swap is needed because NIC registers are in
+ * little-endian order.
+ */
+ if (adapter->rss_reta_updated == 0) {
+ reta = 0;
+ for (i = 0, j = 0; i < RTE_ETH_RSS_RETA_SIZE_128; i++, j++) {
+ if (j == dev->data->nb_rx_queues)
+ j = 0;
+ reta = (reta >> 8) | LS32(j, 24, 0xFF);
+ if ((i & 3) == 3)
+ wr32a(hw, NGBE_REG_RSSTBL, i >> 2, 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_key == NULL)
+ rss_conf.rss_key = rss_intel_key; /* Default hash key */
+ ngbe_dev_rss_hash_update(dev, &rss_conf);
+}
+
git.droids-corp.org / dpdk.git / commitdiff