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Date: Tue, 26 Aug 2008 04:27:16 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: jeff@...zik.org
Cc: netdev@...r.kernel.org, davem@...emloft.net,
akpm@...ux-foundation.org,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [NET-NEXT PATCH 08/13] ixgbe: Lock RSS seed,
move rx_buf_len to the rx_ring
From: Jesse Brandeburg <jesse.brandeburg@...el.com>
This locks the seed down so loading/unloading the driver will present
predictable hashing from RSS. Also move the rx_buf_len out of the adapter
struct, and into the Rx ring struct.
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ixgbe/ixgbe.h | 2 -
drivers/net/ixgbe/ixgbe_main.c | 102 ++++++++++++++++++++++------------------
drivers/net/ixgbe/ixgbe_type.h | 9 ++--
3 files changed, 64 insertions(+), 49 deletions(-)
diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h
index 496a91a..628f60c 100644
--- a/drivers/net/ixgbe/ixgbe.h
+++ b/drivers/net/ixgbe/ixgbe.h
@@ -166,6 +166,7 @@ struct ixgbe_ring {
char name[IFNAMSIZ + 5];
u16 work_limit; /* max work per interrupt */
+ u16 rx_buf_len;
};
#define RING_F_VMDQ 1
@@ -228,7 +229,6 @@ struct ixgbe_adapter {
struct timer_list watchdog_timer;
struct vlan_group *vlgrp;
u16 bd_number;
- u16 rx_buf_len;
struct work_struct reset_task;
struct ixgbe_q_vector q_vector[MAX_MSIX_Q_VECTORS];
char name[MAX_MSIX_COUNT][IFNAMSIZ + 5];
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 95d0041..b578099 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -474,15 +474,15 @@ static inline void ixgbe_rx_checksum(struct ixgbe_adapter *adapter,
* @adapter: address of board private structure
**/
static void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter,
- struct ixgbe_ring *rx_ring,
- int cleaned_count)
+ struct ixgbe_ring *rx_ring,
+ int cleaned_count)
{
struct net_device *netdev = adapter->netdev;
struct pci_dev *pdev = adapter->pdev;
union ixgbe_adv_rx_desc *rx_desc;
struct ixgbe_rx_buffer *bi;
unsigned int i;
- unsigned int bufsz = adapter->rx_buf_len + NET_IP_ALIGN;
+ unsigned int bufsz = rx_ring->rx_buf_len + NET_IP_ALIGN;
i = rx_ring->next_to_use;
bi = &rx_ring->rx_buffer_info[i];
@@ -498,8 +498,8 @@ static void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter,
goto no_buffers;
}
bi->page_dma = pci_map_page(pdev, bi->page, 0,
- PAGE_SIZE,
- PCI_DMA_FROMDEVICE);
+ PAGE_SIZE,
+ PCI_DMA_FROMDEVICE);
}
if (!bi->skb) {
@@ -535,6 +535,7 @@ static void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter,
i = 0;
bi = &rx_ring->rx_buffer_info[i];
}
+
no_buffers:
if (rx_ring->next_to_use != i) {
rx_ring->next_to_use = i;
@@ -552,9 +553,19 @@ no_buffers:
}
}
+static inline u16 ixgbe_get_hdr_info(union ixgbe_adv_rx_desc *rx_desc)
+{
+ return rx_desc->wb.lower.lo_dword.hs_rss.hdr_info;
+}
+
+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,
- struct ixgbe_ring *rx_ring,
- int *work_done, int work_to_do)
+ struct ixgbe_ring *rx_ring,
+ int *work_done, int work_to_do)
{
struct net_device *netdev = adapter->netdev;
struct pci_dev *pdev = adapter->pdev;
@@ -562,36 +573,35 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_adapter *adapter,
struct ixgbe_rx_buffer *rx_buffer_info, *next_buffer;
struct sk_buff *skb;
unsigned int i;
- u32 upper_len, len, staterr;
+ u32 len, staterr;
u16 hdr_info;
bool cleaned = false;
int cleaned_count = 0;
unsigned int total_rx_bytes = 0, total_rx_packets = 0;
i = rx_ring->next_to_clean;
- upper_len = 0;
rx_desc = IXGBE_RX_DESC_ADV(*rx_ring, i);
staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
rx_buffer_info = &rx_ring->rx_buffer_info[i];
while (staterr & IXGBE_RXD_STAT_DD) {
+ u32 upper_len = 0;
if (*work_done >= work_to_do)
break;
(*work_done)++;
if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
- hdr_info =
- le16_to_cpu(rx_desc->wb.lower.lo_dword.hdr_info);
- len =
- ((hdr_info & IXGBE_RXDADV_HDRBUFLEN_MASK) >>
- IXGBE_RXDADV_HDRBUFLEN_SHIFT);
+ hdr_info = le16_to_cpu(ixgbe_get_hdr_info(rx_desc));
+ len = (hdr_info & IXGBE_RXDADV_HDRBUFLEN_MASK) >>
+ IXGBE_RXDADV_HDRBUFLEN_SHIFT;
if (hdr_info & IXGBE_RXDADV_SPH)
adapter->rx_hdr_split++;
if (len > IXGBE_RX_HDR_SIZE)
len = IXGBE_RX_HDR_SIZE;
upper_len = le16_to_cpu(rx_desc->wb.upper.length);
- } else
+ } else {
len = le16_to_cpu(rx_desc->wb.upper.length);
+ }
cleaned = true;
skb = rx_buffer_info->skb;
@@ -600,8 +610,8 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_adapter *adapter,
if (len && !skb_shinfo(skb)->nr_frags) {
pci_unmap_single(pdev, rx_buffer_info->dma,
- adapter->rx_buf_len + NET_IP_ALIGN,
- PCI_DMA_FROMDEVICE);
+ rx_ring->rx_buf_len + NET_IP_ALIGN,
+ PCI_DMA_FROMDEVICE);
skb_put(skb, len);
}
@@ -1415,7 +1425,7 @@ static int ixgbe_get_skb_hdr(struct sk_buff *skb, void **iphdr, void **tcph,
union ixgbe_adv_rx_desc *rx_desc = priv;
/* Verify that this is a valid IPv4 TCP packet */
- if (!(rx_desc->wb.lower.lo_dword.pkt_info &
+ if (!(ixgbe_get_pkt_info(rx_desc) &
(IXGBE_RXDADV_PKTTYPE_IPV4 | IXGBE_RXDADV_PKTTYPE_TCP)))
return -1;
@@ -1442,10 +1452,13 @@ static void ixgbe_configure_rx(struct ixgbe_adapter *adapter)
int max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
int i, j;
u32 rdlen, rxctrl, rxcsum;
- u32 random[10];
+ static const u32 seed[10] = { 0xE291D73D, 0x1805EC6C, 0x2A94B30D,
+ 0xA54F2BEC, 0xEA49AF7C, 0xE214AD3D, 0xB855AABE,
+ 0x6A3E67EA, 0x14364D17, 0x3BED200D};
u32 fctrl, hlreg0;
u32 pages;
u32 reta = 0, mrqc, srrctl;
+ int rx_buf_len;
/* Decide whether to use packet split mode or not */
if (netdev->mtu > ETH_DATA_LEN)
@@ -1455,12 +1468,12 @@ static void ixgbe_configure_rx(struct ixgbe_adapter *adapter)
/* Set the RX buffer length according to the mode */
if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
- adapter->rx_buf_len = IXGBE_RX_HDR_SIZE;
+ rx_buf_len = IXGBE_RX_HDR_SIZE;
} else {
if (netdev->mtu <= ETH_DATA_LEN)
- adapter->rx_buf_len = MAXIMUM_ETHERNET_VLAN_SIZE;
+ rx_buf_len = MAXIMUM_ETHERNET_VLAN_SIZE;
else
- adapter->rx_buf_len = ALIGN(max_frame, 1024);
+ rx_buf_len = ALIGN(max_frame, 1024);
}
fctrl = IXGBE_READ_REG(&adapter->hw, IXGBE_FCTRL);
@@ -1490,12 +1503,11 @@ static void ixgbe_configure_rx(struct ixgbe_adapter *adapter)
} else {
srrctl |= IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;
- if (adapter->rx_buf_len == MAXIMUM_ETHERNET_VLAN_SIZE)
+ if (rx_buf_len == MAXIMUM_ETHERNET_VLAN_SIZE)
srrctl |=
IXGBE_RXBUFFER_2048 >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
else
- srrctl |=
- adapter->rx_buf_len >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
+ srrctl |= rx_buf_len >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
}
IXGBE_WRITE_REG(&adapter->hw, IXGBE_SRRCTL(0), srrctl);
@@ -1508,13 +1520,15 @@ static void ixgbe_configure_rx(struct ixgbe_adapter *adapter)
* the Base and Length of the Rx Descriptor Ring */
for (i = 0; i < adapter->num_rx_queues; i++) {
rdba = adapter->rx_ring[i].dma;
- IXGBE_WRITE_REG(hw, IXGBE_RDBAL(i), (rdba & DMA_32BIT_MASK));
- IXGBE_WRITE_REG(hw, IXGBE_RDBAH(i), (rdba >> 32));
- IXGBE_WRITE_REG(hw, IXGBE_RDLEN(i), rdlen);
- IXGBE_WRITE_REG(hw, IXGBE_RDH(i), 0);
- IXGBE_WRITE_REG(hw, IXGBE_RDT(i), 0);
- adapter->rx_ring[i].head = IXGBE_RDH(i);
- adapter->rx_ring[i].tail = IXGBE_RDT(i);
+ j = adapter->rx_ring[i].reg_idx;
+ IXGBE_WRITE_REG(hw, IXGBE_RDBAL(j), (rdba & DMA_32BIT_MASK));
+ IXGBE_WRITE_REG(hw, IXGBE_RDBAH(j), (rdba >> 32));
+ IXGBE_WRITE_REG(hw, IXGBE_RDLEN(j), rdlen);
+ IXGBE_WRITE_REG(hw, IXGBE_RDH(j), 0);
+ IXGBE_WRITE_REG(hw, IXGBE_RDT(j), 0);
+ 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 */
@@ -1541,22 +1555,20 @@ static void ixgbe_configure_rx(struct ixgbe_adapter *adapter)
}
/* Fill out hash function seeds */
- /* XXX use a random constant here to glue certain flows */
- get_random_bytes(&random[0], 40);
for (i = 0; i < 10; i++)
- IXGBE_WRITE_REG(hw, IXGBE_RSSRK(i), random[i]);
+ IXGBE_WRITE_REG(hw, IXGBE_RSSRK(i), seed[i]);
mrqc = IXGBE_MRQC_RSSEN
/* Perform hash on these packet types */
- | IXGBE_MRQC_RSS_FIELD_IPV4
- | IXGBE_MRQC_RSS_FIELD_IPV4_TCP
- | IXGBE_MRQC_RSS_FIELD_IPV4_UDP
- | IXGBE_MRQC_RSS_FIELD_IPV6_EX_TCP
- | IXGBE_MRQC_RSS_FIELD_IPV6_EX
- | IXGBE_MRQC_RSS_FIELD_IPV6
- | IXGBE_MRQC_RSS_FIELD_IPV6_TCP
- | IXGBE_MRQC_RSS_FIELD_IPV6_UDP
- | IXGBE_MRQC_RSS_FIELD_IPV6_EX_UDP;
+ | IXGBE_MRQC_RSS_FIELD_IPV4
+ | IXGBE_MRQC_RSS_FIELD_IPV4_TCP
+ | IXGBE_MRQC_RSS_FIELD_IPV4_UDP
+ | IXGBE_MRQC_RSS_FIELD_IPV6_EX_TCP
+ | IXGBE_MRQC_RSS_FIELD_IPV6_EX
+ | IXGBE_MRQC_RSS_FIELD_IPV6
+ | IXGBE_MRQC_RSS_FIELD_IPV6_TCP
+ | IXGBE_MRQC_RSS_FIELD_IPV6_UDP
+ | IXGBE_MRQC_RSS_FIELD_IPV6_EX_UDP;
IXGBE_WRITE_REG(hw, IXGBE_MRQC, mrqc);
}
@@ -1926,7 +1938,7 @@ static void ixgbe_clean_rx_ring(struct ixgbe_adapter *adapter,
rx_buffer_info = &rx_ring->rx_buffer_info[i];
if (rx_buffer_info->dma) {
pci_unmap_single(pdev, rx_buffer_info->dma,
- adapter->rx_buf_len,
+ rx_ring->rx_buf_len,
PCI_DMA_FROMDEVICE);
rx_buffer_info->dma = 0;
}
diff --git a/drivers/net/ixgbe/ixgbe_type.h b/drivers/net/ixgbe/ixgbe_type.h
index 2f4d34e..85eb03c 100644
--- a/drivers/net/ixgbe/ixgbe_type.h
+++ b/drivers/net/ixgbe/ixgbe_type.h
@@ -1049,9 +1049,12 @@ union ixgbe_adv_rx_desc {
} read;
struct {
struct {
- struct {
- __le16 pkt_info; /* RSS type, Packet type */
- __le16 hdr_info; /* Split Header, header len */
+ union {
+ __le32 data;
+ struct {
+ __le16 pkt_info; /* RSS type, Packet type */
+ __le16 hdr_info; /* Split Header, header len */
+ } hs_rss;
} lo_dword;
union {
__le32 rss; /* RSS Hash */
--
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