Commit 5c0999b7 authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
Browse files

igb: Replace LRO with GRO 



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: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 649aa95d

drivers/net/Kconfig

+0 −1
Original line number Diff line number Diff line
@@ -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.

drivers/net/igb/igb.h

+0 −16
Original line number Diff line number Diff line
@@ -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;

};

drivers/net/igb/igb_ethtool.c

+0 −17
Original line number Diff line number Diff line
@@ -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++) {

drivers/net/igb/igb_main.c

+6 −84
Original line number Diff line number Diff line
@@ -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,

			vlan_gro_receive(&ring->napi, adapter->vlgrp,

			                 le16_to_cpu(rx_desc->wb.upper.vlan),

			                   rx_desc);

			                 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);

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