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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 2008-07-08 15:12:13 -07:00 committed by Jeff Garzik
parent bf36c1a004
commit d335252027
5 changed files with 147 additions and 9 deletions
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9
drivers/net/Kconfig
View File

@ -2018,6 +2018,15 @@ config IGB
To compile this driver as a module, choose M here. The module
will be called igb.
config IGB_LRO
bool "Use software LRO"
depends on IGB && INET
select INET_LRO
---help---
Say Y here if you want to use large receive offload.
If in doubt, say N.
source "drivers/net/ixp2000/Kconfig"
config MYRI_SBUS

2
drivers/net/igb/e1000_82575.h
View File

@ -99,6 +99,8 @@ union e1000_adv_rx_desc {
/* RSS Hash results */
/* RSS Packet Types as indicated in the receive descriptor */
#define E1000_RXDADV_PKTTYPE_IPV4 0x00000010 /* IPV4 hdr present */
#define E1000_RXDADV_PKTTYPE_TCP 0x00000100 /* TCP hdr present */
/* Transmit Descriptor - Advanced */
union e1000_adv_tx_desc {

16
drivers/net/igb/igb.h
View File

@ -36,6 +36,12 @@
struct igb_adapter;
#ifdef CONFIG_IGB_LRO
#include <linux/inet_lro.h>
#define MAX_LRO_AGGR 32
#define MAX_LRO_DESCRIPTORS 8
#endif
/* Interrupt defines */
#define IGB_MAX_TX_CLEAN 72
@ -167,6 +173,10 @@ struct igb_ring {
int no_itr_adjust;
struct igb_queue_stats rx_stats;
struct napi_struct napi;
#ifdef CONFIG_IGB_LRO
struct net_lro_mgr lro_mgr;
bool lro_used;
#endif
};
};
@ -278,6 +288,12 @@ struct igb_adapter {
#ifdef CONFIG_NETDEVICES_MULTIQUEUE
struct igb_ring *multi_tx_table[IGB_MAX_TX_QUEUES];
#endif /* CONFIG_NETDEVICES_MULTIQUEUE */
#ifdef CONFIG_IGB_LRO
unsigned int lro_max_aggr;
unsigned int lro_aggregated;
unsigned int lro_flushed;
unsigned int lro_no_desc;
#endif
};
#define IGB_FLAG_HAS_MSI (1 << 0)

17
drivers/net/igb/igb_ethtool.c
View File

@ -93,6 +93,11 @@ static const struct igb_stats igb_gstrings_stats[] = {
{ "tx_smbus", IGB_STAT(stats.mgptc) },
{ "rx_smbus", IGB_STAT(stats.mgprc) },
{ "dropped_smbus", IGB_STAT(stats.mgpdc) },
#ifdef CONFIG_IGB_LRO
{ "lro_aggregated", IGB_STAT(lro_aggregated) },
{ "lro_flushed", IGB_STAT(lro_flushed) },
{ "lro_no_desc", IGB_STAT(lro_no_desc) },
#endif
};
#define IGB_QUEUE_STATS_LEN \
@ -1917,6 +1922,18 @@ static void igb_get_ethtool_stats(struct net_device *netdev,
int stat_count = sizeof(struct igb_queue_stats) / sizeof(u64);
int j;
int i;
#ifdef CONFIG_IGB_LRO
int aggregated = 0, flushed = 0, no_desc = 0;
for (i = 0; i < adapter->num_rx_queues; i++) {
aggregated += adapter->rx_ring[i].lro_mgr.stats.aggregated;
flushed += adapter->rx_ring[i].lro_mgr.stats.flushed;
no_desc += adapter->rx_ring[i].lro_mgr.stats.no_desc;
}
adapter->lro_aggregated = aggregated;
adapter->lro_flushed = flushed;
adapter->lro_no_desc = no_desc;
#endif
igb_update_stats(adapter);
for (i = 0; i < IGB_GLOBAL_STATS_LEN; i++) {

112
drivers/net/igb/igb_main.c
View File

@ -116,6 +116,9 @@ static bool igb_clean_tx_irq(struct igb_ring *);
static int igb_poll(struct napi_struct *, int);
static bool igb_clean_rx_irq_adv(struct igb_ring *, int *, int);
static void igb_alloc_rx_buffers_adv(struct igb_ring *, int);
#ifdef CONFIG_IGB_LRO
static int igb_get_skb_hdr(struct sk_buff *skb, void **, void **, u64 *, void *);
#endif
static int igb_ioctl(struct net_device *, struct ifreq *, int cmd);
static void igb_tx_timeout(struct net_device *);
static void igb_reset_task(struct work_struct *);
@ -1134,6 +1137,10 @@ static int __devinit igb_probe(struct pci_dev *pdev,
netdev->features |= NETIF_F_TSO;
netdev->features |= NETIF_F_TSO6;
#ifdef CONFIG_IGB_LRO
netdev->features |= NETIF_F_LRO;
#endif
netdev->vlan_features |= NETIF_F_TSO;
netdev->vlan_features |= NETIF_F_TSO6;
netdev->vlan_features |= NETIF_F_HW_CSUM;
@ -1705,6 +1712,14 @@ int igb_setup_rx_resources(struct igb_adapter *adapter,
struct pci_dev *pdev = adapter->pdev;
int size, desc_len;
#ifdef CONFIG_IGB_LRO
size = sizeof(struct net_lro_desc) * MAX_LRO_DESCRIPTORS;
rx_ring->lro_mgr.lro_arr = vmalloc(size);
if (!rx_ring->lro_mgr.lro_arr)
goto err;
memset(rx_ring->lro_mgr.lro_arr, 0, size);
#endif
size = sizeof(struct igb_buffer) * rx_ring->count;
rx_ring->buffer_info = vmalloc(size);
if (!rx_ring->buffer_info)
@ -1731,6 +1746,10 @@ int igb_setup_rx_resources(struct igb_adapter *adapter,
return 0;
err:
#ifdef CONFIG_IGB_LRO
vfree(rx_ring->lro_mgr.lro_arr);
rx_ring->lro_mgr.lro_arr = NULL;
#endif
vfree(rx_ring->buffer_info);
dev_err(&adapter->pdev->dev, "Unable to allocate memory for "
"the receive descriptor ring\n");
@ -1894,6 +1913,16 @@ static void igb_configure_rx(struct igb_adapter *adapter)
rxdctl |= IGB_RX_HTHRESH << 8;
rxdctl |= IGB_RX_WTHRESH << 16;
wr32(E1000_RXDCTL(i), rxdctl);
#ifdef CONFIG_IGB_LRO
/* Intitial LRO Settings */
ring->lro_mgr.max_aggr = MAX_LRO_AGGR;
ring->lro_mgr.max_desc = MAX_LRO_DESCRIPTORS;
ring->lro_mgr.get_skb_header = igb_get_skb_hdr;
ring->lro_mgr.features = LRO_F_NAPI | LRO_F_EXTRACT_VLAN_ID;
ring->lro_mgr.dev = adapter->netdev;
ring->lro_mgr.ip_summed = CHECKSUM_UNNECESSARY;
ring->lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
#endif
}
if (adapter->num_rx_queues > 1) {
@ -2085,6 +2114,11 @@ static void igb_free_rx_resources(struct igb_ring *rx_ring)
vfree(rx_ring->buffer_info);
rx_ring->buffer_info = NULL;
#ifdef CONFIG_IGB_LRO
vfree(rx_ring->lro_mgr.lro_arr);
rx_ring->lro_mgr.lro_arr = NULL;
#endif
pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
rx_ring->desc = NULL;
@ -3735,22 +3769,75 @@ done_cleaning:
return retval;
}
#ifdef CONFIG_IGB_LRO
/**
* igb_get_skb_hdr - helper function for LRO header processing
* @skb: pointer to sk_buff to be added to LRO packet
* @iphdr: pointer to ip header structure
* @tcph: pointer to tcp header structure
* @hdr_flags: pointer to header flags
* @priv: pointer to the receive descriptor for the current sk_buff
**/
static int igb_get_skb_hdr(struct sk_buff *skb, void **iphdr, void **tcph,
u64 *hdr_flags, void *priv)
{
union e1000_adv_rx_desc *rx_desc = priv;
u16 pkt_type = rx_desc->wb.lower.lo_dword.pkt_info &
(E1000_RXDADV_PKTTYPE_IPV4 | E1000_RXDADV_PKTTYPE_TCP);
/* Verify that this is a valid IPv4 TCP packet */
if (pkt_type != (E1000_RXDADV_PKTTYPE_IPV4 |
E1000_RXDADV_PKTTYPE_TCP))
return -1;
/* Set network headers */
skb_reset_network_header(skb);
skb_set_transport_header(skb, ip_hdrlen(skb));
*iphdr = ip_hdr(skb);
*tcph = tcp_hdr(skb);
*hdr_flags = LRO_IPV4 | LRO_TCP;
return 0;
}
#endif /* CONFIG_IGB_LRO */
/**
* igb_receive_skb - helper function to handle rx indications
* @adapter: board private structure
* @ring: pointer to receive ring receving this packet
* @status: descriptor status field as written by hardware
* @vlan: descriptor vlan field as written by hardware (no le/be conversion)
* @skb: pointer to sk_buff to be indicated to stack
**/
static void igb_receive_skb(struct igb_adapter *adapter, u8 status, __le16 vlan,
struct sk_buff *skb)
static void igb_receive_skb(struct igb_ring *ring, u8 status,
union e1000_adv_rx_desc * rx_desc,
struct sk_buff *skb)
{
if (adapter->vlgrp && (status & E1000_RXD_STAT_VP))
vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
le16_to_cpu(vlan));
else
netif_receive_skb(skb);
struct igb_adapter * adapter = ring->adapter;
bool vlan_extracted = (adapter->vlgrp && (status & E1000_RXD_STAT_VP));
#ifdef CONFIG_IGB_LRO
if (adapter->netdev->features & NETIF_F_LRO &&
skb->ip_summed == CHECKSUM_UNNECESSARY) {
if (vlan_extracted)
lro_vlan_hwaccel_receive_skb(&ring->lro_mgr, skb,
adapter->vlgrp,
le16_to_cpu(rx_desc->wb.upper.vlan),
rx_desc);
else
lro_receive_skb(&ring->lro_mgr,skb, rx_desc);
ring->lro_used = 1;
} else {
#endif
if (vlan_extracted)
vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
le16_to_cpu(rx_desc->wb.upper.vlan));
else
netif_receive_skb(skb);
#ifdef CONFIG_IGB_LRO
}
#endif
}
@ -3883,7 +3970,7 @@ send_up:
skb->protocol = eth_type_trans(skb, netdev);
igb_receive_skb(adapter, staterr, rx_desc->wb.upper.vlan, skb);
igb_receive_skb(rx_ring, staterr, rx_desc, skb);
netdev->last_rx = jiffies;
@ -3906,6 +3993,13 @@ next_desc:
rx_ring->next_to_clean = i;
cleaned_count = IGB_DESC_UNUSED(rx_ring);
#ifdef CONFIG_IGB_LRO
if (rx_ring->lro_used) {
lro_flush_all(&rx_ring->lro_mgr);
rx_ring->lro_used = 0;
}
#endif
if (cleaned_count)
igb_alloc_rx_buffers_adv(rx_ring, cleaned_count);