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ixgbe: Replace LRO with GRO

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

As GRO uses the napi structure to track the held packets, I've
modified the code paths involved to pass that along.

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
2009-01-18 21:49:45 -08:00
committed by David S. Miller
parent f3f3abb62c
commit 78b6f4ce58
4 changed files with 13 additions and 89 deletions
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81
drivers/net/ixgbe/ixgbe_main.c
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@@ -403,23 +403,20 @@ static int __ixgbe_notify_dca(struct device *dev, void *data)
* @rx_ring: rx descriptor ring (for a specific queue) to setup
* @rx_desc: rx descriptor
**/
static void ixgbe_receive_skb(struct ixgbe_adapter *adapter,
static void ixgbe_receive_skb(struct ixgbe_q_vector *q_vector,
struct sk_buff *skb, u8 status,
struct ixgbe_ring *ring,
union ixgbe_adv_rx_desc *rx_desc)
{
struct ixgbe_adapter *adapter = q_vector->adapter;
struct napi_struct *napi = &q_vector->napi;
bool is_vlan = (status & IXGBE_RXD_STAT_VP);
u16 tag = le16_to_cpu(rx_desc->wb.upper.vlan);
if (adapter->netdev->features & NETIF_F_LRO &&
skb->ip_summed == CHECKSUM_UNNECESSARY) {
if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
if (adapter->vlgrp && is_vlan && (tag != 0))
lro_vlan_hwaccel_receive_skb(&ring->lro_mgr, skb,
adapter->vlgrp, tag,
rx_desc);
vlan_gro_receive(napi, adapter->vlgrp, tag, skb);
else
lro_receive_skb(&ring->lro_mgr, skb, rx_desc);
ring->lro_used = true;
napi_gro_receive(napi, skb);
} else {
if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL)) {
if (adapter->vlgrp && is_vlan && (tag != 0))
@@ -574,10 +571,11 @@ static inline u16 ixgbe_get_pkt_info(union ixgbe_adv_rx_desc *rx_desc)
return rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
}
static bool ixgbe_clean_rx_irq(struct ixgbe_adapter *adapter,
static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
struct ixgbe_ring *rx_ring,
int *work_done, int work_to_do)
{
struct ixgbe_adapter *adapter = q_vector->adapter;
struct pci_dev *pdev = adapter->pdev;
union ixgbe_adv_rx_desc *rx_desc, *next_rxd;
struct ixgbe_rx_buffer *rx_buffer_info, *next_buffer;
@@ -678,7 +676,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_adapter *adapter,
total_rx_packets++;
skb->protocol = eth_type_trans(skb, adapter->netdev);
ixgbe_receive_skb(adapter, skb, staterr, rx_ring, rx_desc);
ixgbe_receive_skb(q_vector, skb, staterr, rx_desc);
next_desc:
rx_desc->wb.upper.status_error = 0;
@@ -696,11 +694,6 @@ next_desc:
staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
}
if (rx_ring->lro_used) {
lro_flush_all(&rx_ring->lro_mgr);
rx_ring->lro_used = false;
}
rx_ring->next_to_clean = i;
cleaned_count = IXGBE_DESC_UNUSED(rx_ring);
@@ -1052,7 +1045,7 @@ static int ixgbe_clean_rxonly(struct napi_struct *napi, int budget)
ixgbe_update_rx_dca(adapter, rx_ring);
#endif
ixgbe_clean_rx_irq(adapter, rx_ring, &work_done, budget);
ixgbe_clean_rx_irq(q_vector, rx_ring, &work_done, budget);
/* If all Rx work done, exit the polling mode */
if (work_done < budget) {
@@ -1095,7 +1088,7 @@ static int ixgbe_clean_rxonly_many(struct napi_struct *napi, int budget)
if (adapter->flags & IXGBE_FLAG_DCA_ENABLED)
ixgbe_update_rx_dca(adapter, rx_ring);
#endif
ixgbe_clean_rx_irq(adapter, rx_ring, &work_done, budget);
ixgbe_clean_rx_irq(q_vector, rx_ring, &work_done, budget);
enable_mask |= rx_ring->v_idx;
r_idx = find_next_bit(q_vector->rxr_idx, adapter->num_rx_queues,
r_idx + 1);
@@ -1568,33 +1561,6 @@ static void ixgbe_configure_srrctl(struct ixgbe_adapter *adapter, int index)
IXGBE_WRITE_REG(&adapter->hw, IXGBE_SRRCTL(index), srrctl);
}
/**
* ixgbe_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: private data
**/
static int ixgbe_get_skb_hdr(struct sk_buff *skb, void **iphdr, void **tcph,
u64 *hdr_flags, void *priv)
{
union ixgbe_adv_rx_desc *rx_desc = priv;
/* Verify that this is a valid IPv4 TCP packet */
if (!((ixgbe_get_pkt_info(rx_desc) & IXGBE_RXDADV_PKTTYPE_IPV4) &&
(ixgbe_get_pkt_info(rx_desc) & IXGBE_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;
}
#define PAGE_USE_COUNT(S) (((S) >> PAGE_SHIFT) + \
(((S) & (PAGE_SIZE - 1)) ? 1 : 0))
@@ -1666,16 +1632,6 @@ static void ixgbe_configure_rx(struct ixgbe_adapter *adapter)
adapter->rx_ring[i].head = IXGBE_RDH(j);
adapter->rx_ring[i].tail = IXGBE_RDT(j);
adapter->rx_ring[i].rx_buf_len = rx_buf_len;
/* Intitial LRO Settings */
adapter->rx_ring[i].lro_mgr.max_aggr = IXGBE_MAX_LRO_AGGREGATE;
adapter->rx_ring[i].lro_mgr.max_desc = IXGBE_MAX_LRO_DESCRIPTORS;
adapter->rx_ring[i].lro_mgr.get_skb_header = ixgbe_get_skb_hdr;
adapter->rx_ring[i].lro_mgr.features = LRO_F_EXTRACT_VLAN_ID;
if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL))
adapter->rx_ring[i].lro_mgr.features |= LRO_F_NAPI;
adapter->rx_ring[i].lro_mgr.dev = adapter->netdev;
adapter->rx_ring[i].lro_mgr.ip_summed = CHECKSUM_UNNECESSARY;
adapter->rx_ring[i].lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
ixgbe_configure_srrctl(adapter, j);
}
@@ -2310,7 +2266,7 @@ static int ixgbe_poll(struct napi_struct *napi, int budget)
#endif
tx_cleaned = ixgbe_clean_tx_irq(adapter, adapter->tx_ring);
ixgbe_clean_rx_irq(adapter, adapter->rx_ring, &work_done, budget);
ixgbe_clean_rx_irq(q_vector, adapter->rx_ring, &work_done, budget);
if (tx_cleaned)
work_done = budget;
@@ -2926,12 +2882,6 @@ int ixgbe_setup_rx_resources(struct ixgbe_adapter *adapter,
struct pci_dev *pdev = adapter->pdev;
int size;
size = sizeof(struct net_lro_desc) * IXGBE_MAX_LRO_DESCRIPTORS;
rx_ring->lro_mgr.lro_arr = vmalloc(size);
if (!rx_ring->lro_mgr.lro_arr)
return -ENOMEM;
memset(rx_ring->lro_mgr.lro_arr, 0, size);
size = sizeof(struct ixgbe_rx_buffer) * rx_ring->count;
rx_ring->rx_buffer_info = vmalloc(size);
if (!rx_ring->rx_buffer_info) {
@@ -2960,8 +2910,6 @@ int ixgbe_setup_rx_resources(struct ixgbe_adapter *adapter,
return 0;
alloc_failed:
vfree(rx_ring->lro_mgr.lro_arr);
rx_ring->lro_mgr.lro_arr = NULL;
return -ENOMEM;
}
@@ -3039,9 +2987,6 @@ void ixgbe_free_rx_resources(struct ixgbe_adapter *adapter,
{
struct pci_dev *pdev = adapter->pdev;
vfree(rx_ring->lro_mgr.lro_arr);
rx_ring->lro_mgr.lro_arr = NULL;
ixgbe_clean_rx_ring(adapter, rx_ring);
vfree(rx_ring->rx_buffer_info);
@@ -4141,7 +4086,7 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
netdev->features |= NETIF_F_IPV6_CSUM;
netdev->features |= NETIF_F_TSO;
netdev->features |= NETIF_F_TSO6;
netdev->features |= NETIF_F_LRO;
netdev->features |= NETIF_F_GRO;
netdev->vlan_features |= NETIF_F_TSO;
netdev->vlan_features |= NETIF_F_TSO6;