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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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igb: add support for in kernel LRO
This patch adds support for the use of the inet_lro module to provide software LRO support. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Alexander Duyck
Jeff Garzik
parent
bf36c1a004
commit
d335252027
@ -2018,6 +2018,15 @@ config IGB
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To compile this driver as a module, choose M here. The module
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will be called igb.
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config IGB_LRO
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bool "Use software LRO"
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depends on IGB && INET
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select INET_LRO
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---help---
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Say Y here if you want to use large receive offload.
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If in doubt, say N.
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source "drivers/net/ixp2000/Kconfig"
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config MYRI_SBUS
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@ -99,6 +99,8 @@ union e1000_adv_rx_desc {
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/* RSS Hash results */
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/* RSS Packet Types as indicated in the receive descriptor */
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#define E1000_RXDADV_PKTTYPE_IPV4 0x00000010 /* IPV4 hdr present */
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#define E1000_RXDADV_PKTTYPE_TCP 0x00000100 /* TCP hdr present */
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/* Transmit Descriptor - Advanced */
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union e1000_adv_tx_desc {
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@ -36,6 +36,12 @@
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struct igb_adapter;
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#ifdef CONFIG_IGB_LRO
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#include <linux/inet_lro.h>
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#define MAX_LRO_AGGR 32
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#define MAX_LRO_DESCRIPTORS 8
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#endif
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/* Interrupt defines */
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#define IGB_MAX_TX_CLEAN 72
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@ -167,6 +173,10 @@ struct igb_ring {
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int no_itr_adjust;
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struct igb_queue_stats rx_stats;
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struct napi_struct napi;
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#ifdef CONFIG_IGB_LRO
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struct net_lro_mgr lro_mgr;
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bool lro_used;
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#endif
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};
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};
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@ -278,6 +288,12 @@ struct igb_adapter {
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#ifdef CONFIG_NETDEVICES_MULTIQUEUE
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struct igb_ring *multi_tx_table[IGB_MAX_TX_QUEUES];
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#endif /* CONFIG_NETDEVICES_MULTIQUEUE */
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#ifdef CONFIG_IGB_LRO
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unsigned int lro_max_aggr;
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unsigned int lro_aggregated;
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unsigned int lro_flushed;
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unsigned int lro_no_desc;
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#endif
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};
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#define IGB_FLAG_HAS_MSI (1 << 0)
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@ -93,6 +93,11 @@ static const struct igb_stats igb_gstrings_stats[] = {
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{ "tx_smbus", IGB_STAT(stats.mgptc) },
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{ "rx_smbus", IGB_STAT(stats.mgprc) },
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{ "dropped_smbus", IGB_STAT(stats.mgpdc) },
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#ifdef CONFIG_IGB_LRO
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{ "lro_aggregated", IGB_STAT(lro_aggregated) },
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{ "lro_flushed", IGB_STAT(lro_flushed) },
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{ "lro_no_desc", IGB_STAT(lro_no_desc) },
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#endif
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};
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#define IGB_QUEUE_STATS_LEN \
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@ -1917,6 +1922,18 @@ static void igb_get_ethtool_stats(struct net_device *netdev,
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int stat_count = sizeof(struct igb_queue_stats) / sizeof(u64);
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int j;
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int i;
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#ifdef CONFIG_IGB_LRO
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int aggregated = 0, flushed = 0, no_desc = 0;
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for (i = 0; i < adapter->num_rx_queues; i++) {
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aggregated += adapter->rx_ring[i].lro_mgr.stats.aggregated;
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flushed += adapter->rx_ring[i].lro_mgr.stats.flushed;
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no_desc += adapter->rx_ring[i].lro_mgr.stats.no_desc;
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}
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adapter->lro_aggregated = aggregated;
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adapter->lro_flushed = flushed;
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adapter->lro_no_desc = no_desc;
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#endif
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igb_update_stats(adapter);
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for (i = 0; i < IGB_GLOBAL_STATS_LEN; i++) {
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@ -116,6 +116,9 @@ static bool igb_clean_tx_irq(struct igb_ring *);
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static int igb_poll(struct napi_struct *, int);
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static bool igb_clean_rx_irq_adv(struct igb_ring *, int *, int);
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static void igb_alloc_rx_buffers_adv(struct igb_ring *, int);
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#ifdef CONFIG_IGB_LRO
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static int igb_get_skb_hdr(struct sk_buff *skb, void **, void **, u64 *, void *);
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#endif
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static int igb_ioctl(struct net_device *, struct ifreq *, int cmd);
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static void igb_tx_timeout(struct net_device *);
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static void igb_reset_task(struct work_struct *);
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@ -1134,6 +1137,10 @@ static int __devinit igb_probe(struct pci_dev *pdev,
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netdev->features |= NETIF_F_TSO;
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netdev->features |= NETIF_F_TSO6;
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#ifdef CONFIG_IGB_LRO
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netdev->features |= NETIF_F_LRO;
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#endif
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netdev->vlan_features |= NETIF_F_TSO;
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netdev->vlan_features |= NETIF_F_TSO6;
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netdev->vlan_features |= NETIF_F_HW_CSUM;
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@ -1705,6 +1712,14 @@ int igb_setup_rx_resources(struct igb_adapter *adapter,
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struct pci_dev *pdev = adapter->pdev;
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int size, desc_len;
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#ifdef CONFIG_IGB_LRO
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size = sizeof(struct net_lro_desc) * MAX_LRO_DESCRIPTORS;
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rx_ring->lro_mgr.lro_arr = vmalloc(size);
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if (!rx_ring->lro_mgr.lro_arr)
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goto err;
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memset(rx_ring->lro_mgr.lro_arr, 0, size);
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#endif
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size = sizeof(struct igb_buffer) * rx_ring->count;
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rx_ring->buffer_info = vmalloc(size);
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if (!rx_ring->buffer_info)
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@ -1731,6 +1746,10 @@ int igb_setup_rx_resources(struct igb_adapter *adapter,
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return 0;
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err:
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#ifdef CONFIG_IGB_LRO
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vfree(rx_ring->lro_mgr.lro_arr);
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rx_ring->lro_mgr.lro_arr = NULL;
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#endif
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vfree(rx_ring->buffer_info);
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dev_err(&adapter->pdev->dev, "Unable to allocate memory for "
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"the receive descriptor ring\n");
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@ -1894,6 +1913,16 @@ static void igb_configure_rx(struct igb_adapter *adapter)
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rxdctl |= IGB_RX_HTHRESH << 8;
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rxdctl |= IGB_RX_WTHRESH << 16;
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wr32(E1000_RXDCTL(i), rxdctl);
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#ifdef CONFIG_IGB_LRO
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/* Intitial LRO Settings */
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ring->lro_mgr.max_aggr = MAX_LRO_AGGR;
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ring->lro_mgr.max_desc = MAX_LRO_DESCRIPTORS;
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ring->lro_mgr.get_skb_header = igb_get_skb_hdr;
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ring->lro_mgr.features = LRO_F_NAPI | LRO_F_EXTRACT_VLAN_ID;
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ring->lro_mgr.dev = adapter->netdev;
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ring->lro_mgr.ip_summed = CHECKSUM_UNNECESSARY;
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ring->lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
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#endif
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}
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if (adapter->num_rx_queues > 1) {
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@ -2085,6 +2114,11 @@ static void igb_free_rx_resources(struct igb_ring *rx_ring)
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vfree(rx_ring->buffer_info);
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rx_ring->buffer_info = NULL;
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#ifdef CONFIG_IGB_LRO
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vfree(rx_ring->lro_mgr.lro_arr);
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rx_ring->lro_mgr.lro_arr = NULL;
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#endif
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pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
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rx_ring->desc = NULL;
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@ -3735,22 +3769,75 @@ static bool igb_clean_tx_irq(struct igb_ring *tx_ring)
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return retval;
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}
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#ifdef CONFIG_IGB_LRO
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/**
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* igb_get_skb_hdr - helper function for LRO header processing
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* @skb: pointer to sk_buff to be added to LRO packet
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* @iphdr: pointer to ip header structure
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* @tcph: pointer to tcp header structure
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* @hdr_flags: pointer to header flags
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* @priv: pointer to the receive descriptor for the current sk_buff
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**/
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static int igb_get_skb_hdr(struct sk_buff *skb, void **iphdr, void **tcph,
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u64 *hdr_flags, void *priv)
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{
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union e1000_adv_rx_desc *rx_desc = priv;
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u16 pkt_type = rx_desc->wb.lower.lo_dword.pkt_info &
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(E1000_RXDADV_PKTTYPE_IPV4 | E1000_RXDADV_PKTTYPE_TCP);
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/* Verify that this is a valid IPv4 TCP packet */
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if (pkt_type != (E1000_RXDADV_PKTTYPE_IPV4 |
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E1000_RXDADV_PKTTYPE_TCP))
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return -1;
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/* Set network headers */
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skb_reset_network_header(skb);
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skb_set_transport_header(skb, ip_hdrlen(skb));
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*iphdr = ip_hdr(skb);
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*tcph = tcp_hdr(skb);
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*hdr_flags = LRO_IPV4 | LRO_TCP;
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return 0;
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}
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#endif /* CONFIG_IGB_LRO */
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/**
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* igb_receive_skb - helper function to handle rx indications
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* @adapter: board private structure
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* @ring: pointer to receive ring receving this packet
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* @status: descriptor status field as written by hardware
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* @vlan: descriptor vlan field as written by hardware (no le/be conversion)
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* @skb: pointer to sk_buff to be indicated to stack
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**/
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static void igb_receive_skb(struct igb_adapter *adapter, u8 status, __le16 vlan,
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struct sk_buff *skb)
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static void igb_receive_skb(struct igb_ring *ring, u8 status,
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union e1000_adv_rx_desc * rx_desc,
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struct sk_buff *skb)
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{
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if (adapter->vlgrp && (status & E1000_RXD_STAT_VP))
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vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
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le16_to_cpu(vlan));
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else
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netif_receive_skb(skb);
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struct igb_adapter * adapter = ring->adapter;
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bool vlan_extracted = (adapter->vlgrp && (status & E1000_RXD_STAT_VP));
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#ifdef CONFIG_IGB_LRO
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if (adapter->netdev->features & NETIF_F_LRO &&
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skb->ip_summed == CHECKSUM_UNNECESSARY) {
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if (vlan_extracted)
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lro_vlan_hwaccel_receive_skb(&ring->lro_mgr, skb,
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adapter->vlgrp,
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le16_to_cpu(rx_desc->wb.upper.vlan),
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rx_desc);
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else
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lro_receive_skb(&ring->lro_mgr,skb, rx_desc);
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ring->lro_used = 1;
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} else {
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#endif
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if (vlan_extracted)
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vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
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le16_to_cpu(rx_desc->wb.upper.vlan));
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else
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netif_receive_skb(skb);
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#ifdef CONFIG_IGB_LRO
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}
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#endif
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}
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@ -3883,7 +3970,7 @@ static bool igb_clean_rx_irq_adv(struct igb_ring *rx_ring,
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skb->protocol = eth_type_trans(skb, netdev);
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igb_receive_skb(adapter, staterr, rx_desc->wb.upper.vlan, skb);
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igb_receive_skb(rx_ring, staterr, rx_desc, skb);
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netdev->last_rx = jiffies;
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@ -3906,6 +3993,13 @@ static bool igb_clean_rx_irq_adv(struct igb_ring *rx_ring,
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rx_ring->next_to_clean = i;
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cleaned_count = IGB_DESC_UNUSED(rx_ring);
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#ifdef CONFIG_IGB_LRO
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if (rx_ring->lro_used) {
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lro_flush_all(&rx_ring->lro_mgr);
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rx_ring->lro_used = 0;
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}
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#endif
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if (cleaned_count)
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igb_alloc_rx_buffers_adv(rx_ring, cleaned_count);
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