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igb: Replace LRO with GRO

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This patch makes igb invoke the GRO hooks instead of LRO.  As
GRO has a compatible external interface to LRO this is a very
straightforward replacement.

Three things of note:

1) I've kept the LRO Kconfig option until we decide to enable
GRO across the board at which point it can also be killed.

2) The poll_controller stuff is broken in igb as it tries to do
the same work as the normal poll routine.  Since poll_controller
can be called in the middle of a poll, this can't be good.

I noticed this because poll_controller can invoke the GRO hooks
without flushing held GRO packets.

However, this should be harmless (assuming the poll_controller
bug above doesn't kill you first :) since the next ->poll will
clear the backlog.  The only time when we'll have a problem is
if we're already executing the GRO code on the same ring, but
that's no worse than what happens now.

3) I kept the ip_summed check before calling GRO so that we're
on par with previous behaviour.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2009-01-19 15:20:57 -08:00 committed by David S. Miller
parent 649aa95d75
commit 5c0999b72b
4 changed files with 6 additions and 118 deletions
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1
drivers/net/Kconfig
View File

@ -2022,7 +2022,6 @@ config 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.

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

@ -36,12 +36,6 @@
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_MIN_DYN_ITR 3000
#define IGB_MAX_DYN_ITR 96000
@ -176,10 +170,6 @@ struct igb_ring {
struct napi_struct napi;
int set_itr;
struct igb_ring *buddy;
#ifdef CONFIG_IGB_LRO
struct net_lro_mgr lro_mgr;
bool lro_used;
#endif
};
};
@ -288,12 +278,6 @@ struct igb_adapter {
int need_ioport;
struct igb_ring *multi_tx_table[IGB_MAX_TX_QUEUES];
#ifdef CONFIG_IGB_LRO
unsigned int lro_max_aggr;
unsigned int lro_aggregated;
unsigned int lro_flushed;
unsigned int lro_no_desc;
#endif
unsigned int tx_ring_count;
unsigned int rx_ring_count;
};

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

@ -93,11 +93,6 @@ 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 \
@ -1921,18 +1916,6 @@ 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++) {

90
drivers/net/igb/igb_main.c
View File

@ -115,9 +115,6 @@ 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 *);
@ -1189,7 +1186,7 @@ static int __devinit igb_probe(struct pci_dev *pdev,
netdev->features |= NETIF_F_TSO6;
#ifdef CONFIG_IGB_LRO
netdev->features |= NETIF_F_LRO;
netdev->features |= NETIF_F_GRO;
#endif
netdev->vlan_features |= NETIF_F_TSO;
@ -1739,14 +1736,6 @@ 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)
@ -1773,10 +1762,6 @@ 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");
@ -1930,16 +1915,6 @@ static void igb_configure_rx(struct igb_adapter *adapter)
rxdctl |= IGB_RX_HTHRESH << 8;
rxdctl |= IGB_RX_WTHRESH << 16;
wr32(E1000_RXDCTL(j), 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) {
@ -2128,11 +2103,6 @@ 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;
@ -3768,39 +3738,6 @@ static bool igb_clean_tx_irq(struct igb_ring *tx_ring)
return (count < tx_ring->count);
}
#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
* @ring: pointer to receive ring receving this packet
@ -3815,28 +3752,20 @@ static void igb_receive_skb(struct igb_ring *ring, u8 status,
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 (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);
vlan_gro_receive(&ring->napi, adapter->vlgrp,
le16_to_cpu(rx_desc->wb.upper.vlan),
skb);
else
lro_receive_skb(&ring->lro_mgr,skb, rx_desc);
ring->lro_used = 1;
napi_gro_receive(&ring->napi, skb);
} 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
}
@ -3991,13 +3920,6 @@ 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);