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Message-ID: <20110418180857.GB18469@electric-eye.fr.zoreil.com>
Date: Mon, 18 Apr 2011 20:08:57 +0200
From: Francois Romieu <romieu@...zoreil.com>
To: David Dillow <dave@...dillows.org>
Cc: netdev@...r.kernel.org, Realtek <nic_swsd@...ltek.com>,
davem@...emloft.net
Subject: Re: [PATCH v2] net: r8169: convert to hw_features
[...]
> I've attached my ancient patch, if it helps.
Thanks, it works way better now (see below). It is ok for me to use
you s-o-b on it ?
I have given it a try on 8169, 8168b, 8168d, 8102e and the load can
dramatically fall (more at 1000 Mbps than at 100 Mbps).
David (M.), should it go through net-next or be made ready for net-2.6 ?
Subject: [PATCH] r8169: TSO fixes.
- the MSS value is actually contained in a 11 bits wide (0x7ff) field.
The extra bit in the former MSSMask did encompass the TSO command
bit ("LargeSend") as well (0xfff). Oops.
- the Tx descriptor layout is not the same through the whole chipset
family. The 8169 documentation, the 8168c documentation and Realtek's
drivers (8.020.00, 1.019.00, 6.014.00) highlight two layouts:
1. 8169, 8168 up to 8168b (included) and 8101
2. {8102e, 8168c} and beyond
- notwithstanding the "first descriptor" and "last descriptor" bits, the
same Tx descriptor content is enforced when a packet consists of several
descriptors. The chipsets are documented to require it.
Credits go to David Dillow <dave@...dillows.org> for the original patch.
Signed-off-by: Francois Romieu <romieu@...zoreil.com>
Cc: Realtek <nic_swsd@...ltek.com>
---
drivers/net/r8169.c | 209 +++++++++++++++++++++++++++++++++------------------
1 files changed, 137 insertions(+), 72 deletions(-)
diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 058524f..fb03e6f 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -134,47 +134,52 @@ enum mac_version {
RTL_GIGA_MAC_VER_33 = 0x21, // 8168E
};
-#define _R(NAME,MAC,MASK) \
- { .name = NAME, .mac_version = MAC, .RxConfigMask = MASK }
+enum rtl_tx_desc_version {
+ RTL_TD_0 = 0,
+ RTL_TD_1 = 1,
+};
+
+#define _R(NAME,MAC,TD) \
+ { .name = NAME, .mac_version = MAC, .txd_version = TD }
static const struct {
const char *name;
u8 mac_version;
- u32 RxConfigMask; /* Clears the bits supported by this chip */
+ enum rtl_tx_desc_version txd_version;
} rtl_chip_info[] = {
- _R("RTL8169", RTL_GIGA_MAC_VER_01, 0xff7e1880), // 8169
- _R("RTL8169s", RTL_GIGA_MAC_VER_02, 0xff7e1880), // 8169S
- _R("RTL8110s", RTL_GIGA_MAC_VER_03, 0xff7e1880), // 8110S
- _R("RTL8169sb/8110sb", RTL_GIGA_MAC_VER_04, 0xff7e1880), // 8169SB
- _R("RTL8169sc/8110sc", RTL_GIGA_MAC_VER_05, 0xff7e1880), // 8110SCd
- _R("RTL8169sc/8110sc", RTL_GIGA_MAC_VER_06, 0xff7e1880), // 8110SCe
- _R("RTL8102e", RTL_GIGA_MAC_VER_07, 0xff7e1880), // PCI-E
- _R("RTL8102e", RTL_GIGA_MAC_VER_08, 0xff7e1880), // PCI-E
- _R("RTL8102e", RTL_GIGA_MAC_VER_09, 0xff7e1880), // PCI-E
- _R("RTL8101e", RTL_GIGA_MAC_VER_10, 0xff7e1880), // PCI-E
- _R("RTL8168b/8111b", RTL_GIGA_MAC_VER_11, 0xff7e1880), // PCI-E
- _R("RTL8168b/8111b", RTL_GIGA_MAC_VER_12, 0xff7e1880), // PCI-E
- _R("RTL8101e", RTL_GIGA_MAC_VER_13, 0xff7e1880), // PCI-E 8139
- _R("RTL8100e", RTL_GIGA_MAC_VER_14, 0xff7e1880), // PCI-E 8139
- _R("RTL8100e", RTL_GIGA_MAC_VER_15, 0xff7e1880), // PCI-E 8139
- _R("RTL8168b/8111b", RTL_GIGA_MAC_VER_17, 0xff7e1880), // PCI-E
- _R("RTL8101e", RTL_GIGA_MAC_VER_16, 0xff7e1880), // PCI-E
- _R("RTL8168cp/8111cp", RTL_GIGA_MAC_VER_18, 0xff7e1880), // PCI-E
- _R("RTL8168c/8111c", RTL_GIGA_MAC_VER_19, 0xff7e1880), // PCI-E
- _R("RTL8168c/8111c", RTL_GIGA_MAC_VER_20, 0xff7e1880), // PCI-E
- _R("RTL8168c/8111c", RTL_GIGA_MAC_VER_21, 0xff7e1880), // PCI-E
- _R("RTL8168c/8111c", RTL_GIGA_MAC_VER_22, 0xff7e1880), // PCI-E
- _R("RTL8168cp/8111cp", RTL_GIGA_MAC_VER_23, 0xff7e1880), // PCI-E
- _R("RTL8168cp/8111cp", RTL_GIGA_MAC_VER_24, 0xff7e1880), // PCI-E
- _R("RTL8168d/8111d", RTL_GIGA_MAC_VER_25, 0xff7e1880), // PCI-E
- _R("RTL8168d/8111d", RTL_GIGA_MAC_VER_26, 0xff7e1880), // PCI-E
- _R("RTL8168dp/8111dp", RTL_GIGA_MAC_VER_27, 0xff7e1880), // PCI-E
- _R("RTL8168dp/8111dp", RTL_GIGA_MAC_VER_28, 0xff7e1880), // PCI-E
- _R("RTL8105e", RTL_GIGA_MAC_VER_29, 0xff7e1880), // PCI-E
- _R("RTL8105e", RTL_GIGA_MAC_VER_30, 0xff7e1880), // PCI-E
- _R("RTL8168dp/8111dp", RTL_GIGA_MAC_VER_31, 0xff7e1880), // PCI-E
- _R("RTL8168e/8111e", RTL_GIGA_MAC_VER_32, 0xff7e1880), // PCI-E
- _R("RTL8168e/8111e", RTL_GIGA_MAC_VER_33, 0xff7e1880) // PCI-E
+ _R("RTL8169", RTL_GIGA_MAC_VER_01, RTL_TD_0), // 8169
+ _R("RTL8169s", RTL_GIGA_MAC_VER_02, RTL_TD_0), // 8169S
+ _R("RTL8110s", RTL_GIGA_MAC_VER_03, RTL_TD_0), // 8110S
+ _R("RTL8169sb/8110sb", RTL_GIGA_MAC_VER_04, RTL_TD_0), // 8169SB
+ _R("RTL8169sc/8110sc", RTL_GIGA_MAC_VER_05, RTL_TD_0), // 8110SCd
+ _R("RTL8169sc/8110sc", RTL_GIGA_MAC_VER_06, RTL_TD_0), // 8110SCe
+ _R("RTL8102e", RTL_GIGA_MAC_VER_07, RTL_TD_1), // PCI-E
+ _R("RTL8102e", RTL_GIGA_MAC_VER_08, RTL_TD_1), // PCI-E
+ _R("RTL8102e", RTL_GIGA_MAC_VER_09, RTL_TD_1), // PCI-E
+ _R("RTL8101e", RTL_GIGA_MAC_VER_10, RTL_TD_0), // PCI-E
+ _R("RTL8168b/8111b", RTL_GIGA_MAC_VER_11, RTL_TD_0), // PCI-E
+ _R("RTL8168b/8111b", RTL_GIGA_MAC_VER_12, RTL_TD_0), // PCI-E
+ _R("RTL8101e", RTL_GIGA_MAC_VER_13, RTL_TD_0), // PCI-E 8139
+ _R("RTL8100e", RTL_GIGA_MAC_VER_14, RTL_TD_0), // PCI-E 8139
+ _R("RTL8100e", RTL_GIGA_MAC_VER_15, RTL_TD_0), // PCI-E 8139
+ _R("RTL8168b/8111b", RTL_GIGA_MAC_VER_17, RTL_TD_0), // PCI-E
+ _R("RTL8101e", RTL_GIGA_MAC_VER_16, RTL_TD_0), // PCI-E
+ _R("RTL8168cp/8111cp", RTL_GIGA_MAC_VER_18, RTL_TD_1), // PCI-E
+ _R("RTL8168c/8111c", RTL_GIGA_MAC_VER_19, RTL_TD_1), // PCI-E
+ _R("RTL8168c/8111c", RTL_GIGA_MAC_VER_20, RTL_TD_1), // PCI-E
+ _R("RTL8168c/8111c", RTL_GIGA_MAC_VER_21, RTL_TD_1), // PCI-E
+ _R("RTL8168c/8111c", RTL_GIGA_MAC_VER_22, RTL_TD_1), // PCI-E
+ _R("RTL8168cp/8111cp", RTL_GIGA_MAC_VER_23, RTL_TD_1), // PCI-E
+ _R("RTL8168cp/8111cp", RTL_GIGA_MAC_VER_24, RTL_TD_1), // PCI-E
+ _R("RTL8168d/8111d", RTL_GIGA_MAC_VER_25, RTL_TD_1), // PCI-E
+ _R("RTL8168d/8111d", RTL_GIGA_MAC_VER_26, RTL_TD_1), // PCI-E
+ _R("RTL8168dp/8111dp", RTL_GIGA_MAC_VER_27, RTL_TD_1), // PCI-E
+ _R("RTL8168dp/8111dp", RTL_GIGA_MAC_VER_28, RTL_TD_1), // PCI-E
+ _R("RTL8105e", RTL_GIGA_MAC_VER_29, RTL_TD_1), // PCI-E
+ _R("RTL8105e", RTL_GIGA_MAC_VER_30, RTL_TD_1), // PCI-E
+ _R("RTL8168dp/8111dp", RTL_GIGA_MAC_VER_31, RTL_TD_1), // PCI-E
+ _R("RTL8168e/8111e", RTL_GIGA_MAC_VER_32, RTL_TD_1), // PCI-E
+ _R("RTL8168e/8111e", RTL_GIGA_MAC_VER_33, RTL_TD_1) // PCI-E
};
#undef _R
@@ -230,6 +235,9 @@ enum rtl_registers {
IntrStatus = 0x3e,
TxConfig = 0x40,
RxConfig = 0x44,
+
+#define RTL_RX_CONFIG_MASK 0xff7e1880u
+
RxMissed = 0x4c,
Cfg9346 = 0x50,
Config0 = 0x51,
@@ -452,21 +460,69 @@ enum rtl_register_content {
CounterDump = 0x8,
};
-enum desc_status_bit {
+enum rtl_desc_bit {
+ /* First doubleword. */
DescOwn = (1 << 31), /* Descriptor is owned by NIC */
RingEnd = (1 << 30), /* End of descriptor ring */
FirstFrag = (1 << 29), /* First segment of a packet */
LastFrag = (1 << 28), /* Final segment of a packet */
+};
+
+/* Generic case. */
+enum rtl_tx_desc_bit {
+ /* First doubleword. */
+ TD_LSO = (1 << 27), /* Large Send Offload */
+#define TD_MSS_MAX 0x07ffu /* MSS value */
- /* Tx private */
- LargeSend = (1 << 27), /* TCP Large Send Offload (TSO) */
- MSSShift = 16, /* MSS value position */
- MSSMask = 0xfff, /* MSS value + LargeSend bit: 12 bits */
- IPCS = (1 << 18), /* Calculate IP checksum */
- UDPCS = (1 << 17), /* Calculate UDP/IP checksum */
- TCPCS = (1 << 16), /* Calculate TCP/IP checksum */
- TxVlanTag = (1 << 17), /* Add VLAN tag */
+ /* Second doubleword. */
+ TxVlanTag = (1 << 17), /* Add VLAN tag */
+};
+
+/* 8169, 8168b and 810x except 8102e. */
+enum rtl_tx_desc_bit_0 {
+ /* First doubleword. */
+#define TD0_MSS_SHIFT 16 /* MSS position (11 bits) */
+ TD0_TCP_CS = (1 << 16), /* Calculate TCP/IP checksum */
+ TD0_UDP_CS = (1 << 17), /* Calculate UDP/IP checksum */
+ TD0_IP_CS = (1 << 18), /* Calculate IP checksum */
+};
+
+/* 8102e, 8168c and beyond. */
+enum rtl_tx_desc_bit_1 {
+ /* Second doubleword. */
+#define TD1_MSS_SHIFT 18 /* MSS position (11 bits) */
+ TD1_IP_CS = (1 << 29), /* Calculate IP checksum */
+ TD1_TCP_CS = (1 << 30), /* Calculate TCP/IP checksum */
+ TD1_UDP_CS = (1 << 31), /* Calculate UDP/IP checksum */
+};
+static const struct rtl_tx_desc_info {
+ struct {
+ u32 udp;
+ u32 tcp;
+ } checksum;
+ u16 mss_shift;
+ u16 opts_offset;
+} tx_desc_info [] = {
+ [RTL_TD_0] = {
+ .checksum = {
+ .udp = TD0_IP_CS | TD0_UDP_CS,
+ .tcp = TD0_IP_CS | TD0_TCP_CS
+ },
+ .mss_shift = TD0_MSS_SHIFT,
+ .opts_offset = 0
+ },
+ [RTL_TD_1] = {
+ .checksum = {
+ .udp = TD1_IP_CS | TD1_UDP_CS,
+ .tcp = TD1_IP_CS | TD1_TCP_CS
+ },
+ .mss_shift = TD1_MSS_SHIFT,
+ .opts_offset = 1
+ }
+};
+
+enum rtl_rx_desc_bit {
/* Rx private */
PID1 = (1 << 18), /* Protocol ID bit 1/2 */
PID0 = (1 << 17), /* Protocol ID bit 2/2 */
@@ -531,8 +587,8 @@ struct rtl8169_private {
struct napi_struct napi;
spinlock_t lock; /* spin lock flag */
u32 msg_enable;
- int chipset;
- int mac_version;
+ u16 txd_version;
+ u16 mac_version;
u32 cur_rx; /* Index into the Rx descriptor buffer of next Rx pkt. */
u32 cur_tx; /* Index into the Tx descriptor buffer of next Rx pkt. */
u32 dirty_rx;
@@ -1288,7 +1344,7 @@ static int rtl8169_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
static u32 rtl8169_fix_features(struct net_device *dev, u32 features)
{
- if (dev->mtu > MSSMask)
+ if (dev->mtu > TD_MSS_MAX)
features &= ~NETIF_F_ALL_TSO;
return features;
@@ -3194,7 +3250,7 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
struct mii_if_info *mii;
struct net_device *dev;
void __iomem *ioaddr;
- unsigned int i;
+ int chipset, i;
int rc;
if (netif_msg_drv(&debug)) {
@@ -3336,7 +3392,8 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
"driver bug, MAC version not found in rtl_chip_info\n");
goto err_out_msi_4;
}
- tp->chipset = i;
+ chipset = i;
+ tp->txd_version = rtl_chip_info[chipset].txd_version;
RTL_W8(Cfg9346, Cfg9346_Unlock);
RTL_W8(Config1, RTL_R8(Config1) | PMEnable);
@@ -3413,8 +3470,7 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
pci_set_drvdata(pdev, dev);
netif_info(tp, probe, dev, "%s at 0x%lx, %pM, XID %08x IRQ %d\n",
- rtl_chip_info[tp->chipset].name,
- dev->base_addr, dev->dev_addr,
+ rtl_chip_info[chipset].name, dev->base_addr, dev->dev_addr,
(u32)(RTL_R32(TxConfig) & 0x9cf0f8ff), dev->irq);
if ((tp->mac_version == RTL_GIGA_MAC_VER_27) ||
@@ -3572,7 +3628,7 @@ static void rtl_set_rx_tx_config_registers(struct rtl8169_private *tp)
void __iomem *ioaddr = tp->mmio_addr;
u32 cfg = rtl8169_rx_config;
- cfg |= (RTL_R32(RxConfig) & rtl_chip_info[tp->chipset].RxConfigMask);
+ cfg |= (RTL_R32(RxConfig) & RTL_RX_CONFIG_MASK);
RTL_W32(RxConfig, cfg);
/* Set DMA burst size and Interframe Gap Time */
@@ -4564,7 +4620,7 @@ static void rtl8169_tx_timeout(struct net_device *dev)
}
static int rtl8169_xmit_frags(struct rtl8169_private *tp, struct sk_buff *skb,
- u32 opts1)
+ u32 *opts)
{
struct skb_shared_info *info = skb_shinfo(skb);
unsigned int cur_frag, entry;
@@ -4592,9 +4648,11 @@ static int rtl8169_xmit_frags(struct rtl8169_private *tp, struct sk_buff *skb,
}
/* anti gcc 2.95.3 bugware (sic) */
- status = opts1 | len | (RingEnd * !((entry + 1) % NUM_TX_DESC));
+ status = opts[0] | len |
+ (RingEnd * !((entry + 1) % NUM_TX_DESC));
txd->opts1 = cpu_to_le32(status);
+ txd->opts2 = cpu_to_le32(opts[1]);
txd->addr = cpu_to_le64(mapping);
tp->tx_skb[entry].len = len;
@@ -4612,23 +4670,26 @@ err_out:
return -EIO;
}
-static inline u32 rtl8169_tso_csum(struct sk_buff *skb, struct net_device *dev)
+static inline void rtl8169_tso_csum(struct rtl8169_private *tp,
+ struct sk_buff *skb, u32 *opts)
{
+ const struct rtl_tx_desc_info *info = tx_desc_info + tp->txd_version;
u32 mss = skb_shinfo(skb)->gso_size;
+ int offset = info->opts_offset;
- if (mss)
- return LargeSend | ((mss & MSSMask) << MSSShift);
-
- if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ if (mss) {
+ opts[0] |= TD_LSO;
+ opts[offset] |= min(mss, TD_MSS_MAX) << info->mss_shift;
+ } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
const struct iphdr *ip = ip_hdr(skb);
if (ip->protocol == IPPROTO_TCP)
- return IPCS | TCPCS;
+ opts[offset] |= info->checksum.tcp;
else if (ip->protocol == IPPROTO_UDP)
- return IPCS | UDPCS;
- WARN_ON(1); /* we need a WARN() */
+ opts[offset] |= info->checksum.udp;
+ else
+ WARN_ON_ONCE(1);
}
- return 0;
}
static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
@@ -4641,7 +4702,7 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
struct device *d = &tp->pci_dev->dev;
dma_addr_t mapping;
u32 status, len;
- u32 opts1;
+ u32 opts[2];
int frags;
if (unlikely(TX_BUFFS_AVAIL(tp) < skb_shinfo(skb)->nr_frags)) {
@@ -4662,24 +4723,28 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
tp->tx_skb[entry].len = len;
txd->addr = cpu_to_le64(mapping);
- txd->opts2 = cpu_to_le32(rtl8169_tx_vlan_tag(tp, skb));
- opts1 = DescOwn | rtl8169_tso_csum(skb, dev);
+ opts[1] = cpu_to_le32(rtl8169_tx_vlan_tag(tp, skb));
+ opts[0] = DescOwn;
- frags = rtl8169_xmit_frags(tp, skb, opts1);
+ rtl8169_tso_csum(tp, skb, opts);
+
+ frags = rtl8169_xmit_frags(tp, skb, opts);
if (frags < 0)
goto err_dma_1;
else if (frags)
- opts1 |= FirstFrag;
+ opts[0] |= FirstFrag;
else {
- opts1 |= FirstFrag | LastFrag;
+ opts[0] |= FirstFrag | LastFrag;
tp->tx_skb[entry].skb = skb;
}
+ txd->opts2 = cpu_to_le32(opts[1]);
+
wmb();
/* anti gcc 2.95.3 bugware (sic) */
- status = opts1 | len | (RingEnd * !((entry + 1) % NUM_TX_DESC));
+ status = opts[0] | len | (RingEnd * !((entry + 1) % NUM_TX_DESC));
txd->opts1 = cpu_to_le32(status);
tp->cur_tx += frags + 1;
@@ -5167,7 +5232,7 @@ static void rtl_set_rx_mode(struct net_device *dev)
spin_lock_irqsave(&tp->lock, flags);
tmp = rtl8169_rx_config | rx_mode |
- (RTL_R32(RxConfig) & rtl_chip_info[tp->chipset].RxConfigMask);
+ (RTL_R32(RxConfig) & RTL_RX_CONFIG_MASK);
if (tp->mac_version > RTL_GIGA_MAC_VER_06) {
u32 data = mc_filter[0];
--
1.7.4.2
--
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