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Date: Thu, 13 Mar 2008 09:42:42 -0700
From: "Vernon Mauery" <vmauery@...il.com>
To: "Dhananjay Phadke" <dhananjay@...xen.com>
Cc: netdev@...r.kernel.org, "Jeff Garzik" <jeff@...zik.org>
Subject: Re: [PATCH 1/4] netxen: improve msi support
On 3/12/08, Dhananjay Phadke <dhananjay@...xen.com> wrote:
>
> Recent netxen firmware has new scheme of generating MSI interrupts, it
> raises interrupt and blocks itself, waiting for driver to unmask. This
> reduces chance of spurious interrupts.
>
> The driver will be able to deal with older firmware as well.
>
> Signed-off-by: Dhananjay Phadke <dhananjay@...xen.com>
I have tested this patch on my netxen hardware and found that it fixes
a TX timeout hang that I was seeing previously.
Tested-by: Vernon Mauery <vernux@...ibm.com>
--Vernon
> ---
> drivers/net/netxen/netxen_nic.h | 1 +
> drivers/net/netxen/netxen_nic_hdr.h | 12 ++++++
> drivers/net/netxen/netxen_nic_hw.c | 2 +
> drivers/net/netxen/netxen_nic_init.c | 2 +
> drivers/net/netxen/netxen_nic_main.c | 56 ++++++++++++-----------------
> drivers/net/netxen/netxen_nic_phan_reg.h | 3 ++
> 6 files changed, 43 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/net/netxen/netxen_nic.h b/drivers/net/netxen/netxen_nic.h
> index 2bc5eaa..876cd06 100644
> --- a/drivers/net/netxen/netxen_nic.h
> +++ b/drivers/net/netxen/netxen_nic.h
> @@ -942,6 +942,7 @@ struct netxen_adapter {
> struct pci_dev *ctx_desc_pdev;
> dma_addr_t ctx_desc_phys_addr;
> int intr_scheme;
> + int msi_mode;
> int (*enable_phy_interrupts) (struct netxen_adapter *);
> int (*disable_phy_interrupts) (struct netxen_adapter *);
> void (*handle_phy_intr) (struct netxen_adapter *);
> diff --git a/drivers/net/netxen/netxen_nic_hdr.h b/drivers/net/netxen/netxen_nic_hdr.h
> index d72f8f8..160f605 100644
> --- a/drivers/net/netxen/netxen_nic_hdr.h
> +++ b/drivers/net/netxen/netxen_nic_hdr.h
> @@ -456,6 +456,12 @@ enum {
> #define ISR_INT_MASK_SLOW (NETXEN_PCIX_PS_REG(PCIX_INT_MASK))
> #define ISR_INT_TARGET_STATUS (NETXEN_PCIX_PS_REG(PCIX_TARGET_STATUS))
> #define ISR_INT_TARGET_MASK (NETXEN_PCIX_PS_REG(PCIX_TARGET_MASK))
> +#define ISR_INT_TARGET_STATUS_F1 (NETXEN_PCIX_PS_REG(PCIX_TARGET_STATUS_F1))
> +#define ISR_INT_TARGET_MASK_F1 (NETXEN_PCIX_PS_REG(PCIX_TARGET_MASK_F1))
> +#define ISR_INT_TARGET_STATUS_F2 (NETXEN_PCIX_PS_REG(PCIX_TARGET_STATUS_F2))
> +#define ISR_INT_TARGET_MASK_F2 (NETXEN_PCIX_PS_REG(PCIX_TARGET_MASK_F2))
> +#define ISR_INT_TARGET_STATUS_F3 (NETXEN_PCIX_PS_REG(PCIX_TARGET_STATUS_F3))
> +#define ISR_INT_TARGET_MASK_F3 (NETXEN_PCIX_PS_REG(PCIX_TARGET_MASK_F3))
>
> #define NETXEN_PCI_MAPSIZE 128
> #define NETXEN_PCI_DDR_NET (0x00000000UL)
> @@ -662,6 +668,12 @@ enum {
>
> #define PCIX_TARGET_STATUS (0x10118)
> #define PCIX_TARGET_MASK (0x10128)
> +#define PCIX_TARGET_STATUS_F1 (0x10160)
> +#define PCIX_TARGET_MASK_F1 (0x10170)
> +#define PCIX_TARGET_STATUS_F2 (0x10164)
> +#define PCIX_TARGET_MASK_F2 (0x10174)
> +#define PCIX_TARGET_STATUS_F3 (0x10168)
> +#define PCIX_TARGET_MASK_F3 (0x10178)
>
> #define PCIX_MSI_F0 (0x13000)
> #define PCIX_MSI_F1 (0x13004)
> diff --git a/drivers/net/netxen/netxen_nic_hw.c b/drivers/net/netxen/netxen_nic_hw.c
> index 0135570..05748ca 100644
> --- a/drivers/net/netxen/netxen_nic_hw.c
> +++ b/drivers/net/netxen/netxen_nic_hw.c
> @@ -398,6 +398,8 @@ int netxen_nic_hw_resources(struct netxen_adapter *adapter)
> NETXEN_CRB_NORMALIZE(adapter, CRB_NIC_CAPABILITIES_FW));
> printk(KERN_NOTICE "%s: FW capabilities:0x%x\n", netxen_nic_driver_name,
> adapter->intr_scheme);
> + adapter->msi_mode = readl(
> + NETXEN_CRB_NORMALIZE(adapter, CRB_NIC_MSI_MODE_FW));
> DPRINTK(INFO, "Receive Peg ready too. starting stuff\n");
>
> addr = netxen_alloc(adapter->ahw.pdev,
> diff --git a/drivers/net/netxen/netxen_nic_init.c b/drivers/net/netxen/netxen_nic_init.c
> index 9e38bcb..43eb1f6 100644
> --- a/drivers/net/netxen/netxen_nic_init.c
> +++ b/drivers/net/netxen/netxen_nic_init.c
> @@ -145,6 +145,8 @@ int netxen_init_firmware(struct netxen_adapter *adapter)
> /* Window 1 call */
> writel(INTR_SCHEME_PERPORT,
> NETXEN_CRB_NORMALIZE(adapter, CRB_NIC_CAPABILITIES_HOST));
> + writel(MSI_MODE_MULTIFUNC,
> + NETXEN_CRB_NORMALIZE(adapter, CRB_NIC_MSI_MODE_HOST));
> writel(MPORT_MULTI_FUNCTION_MODE,
> NETXEN_CRB_NORMALIZE(adapter, CRB_MPORT_MODE));
> writel(PHAN_INITIALIZE_ACK,
> diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
> index 9737eae..cd665da 100644
> --- a/drivers/net/netxen/netxen_nic_main.c
> +++ b/drivers/net/netxen/netxen_nic_main.c
> @@ -149,33 +149,31 @@ static void netxen_nic_update_cmd_consumer(struct netxen_adapter *adapter,
>
> #define ADAPTER_LIST_SIZE 12
>
> +static uint32_t msi_tgt_status[4] = {
> + ISR_INT_TARGET_STATUS, ISR_INT_TARGET_STATUS_F1,
> + ISR_INT_TARGET_STATUS_F2, ISR_INT_TARGET_STATUS_F3
> +};
> +
> +static uint32_t sw_int_mask[4] = {
> + CRB_SW_INT_MASK_0, CRB_SW_INT_MASK_1,
> + CRB_SW_INT_MASK_2, CRB_SW_INT_MASK_3
> +};
> +
> static void netxen_nic_disable_int(struct netxen_adapter *adapter)
> {
> - uint32_t mask = 0x7ff;
> + u32 mask = 0x7ff;
> int retries = 32;
> + int port = adapter->portnum;
> + int pci_fn = adapter->ahw.pci_func;
>
> - DPRINTK(1, INFO, "Entered ISR Disable \n");
> -
> - switch (adapter->portnum) {
> - case 0:
> - writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_0));
> - break;
> - case 1:
> - writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_1));
> - break;
> - case 2:
> - writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_2));
> - break;
> - case 3:
> - writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_3));
> - break;
> + if (adapter->msi_mode != MSI_MODE_MULTIFUNC) {
> + writel(0x0, NETXEN_CRB_NORMALIZE(adapter, sw_int_mask[port]));
> }
>
> if (adapter->intr_scheme != -1 &&
> adapter->intr_scheme != INTR_SCHEME_PERPORT)
> writel(mask,PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK));
>
> - /* Window = 0 or 1 */
> if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
> do {
> writel(0xffffffff,
> @@ -190,14 +188,18 @@ static void netxen_nic_disable_int(struct netxen_adapter *adapter)
> printk(KERN_NOTICE "%s: Failed to disable interrupt completely\n",
> netxen_nic_driver_name);
> }
> + } else {
> + if (adapter->msi_mode == MSI_MODE_MULTIFUNC) {
> + writel(0xffffffff, PCI_OFFSET_SECOND_RANGE(adapter,
> + msi_tgt_status[pci_fn]));
> + }
> }
> -
> - DPRINTK(1, INFO, "Done with Disable Int\n");
> }
>
> static void netxen_nic_enable_int(struct netxen_adapter *adapter)
> {
> u32 mask;
> + int port = adapter->portnum;
>
> DPRINTK(1, INFO, "Entered ISR Enable \n");
>
> @@ -218,20 +220,7 @@ static void netxen_nic_enable_int(struct netxen_adapter *adapter)
> writel(mask, PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK));
> }
>
> - switch (adapter->portnum) {
> - case 0:
> - writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_0));
> - break;
> - case 1:
> - writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_1));
> - break;
> - case 2:
> - writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_2));
> - break;
> - case 3:
> - writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_3));
> - break;
> - }
> + writel(0x1, NETXEN_CRB_NORMALIZE(adapter, sw_int_mask[port]));
>
> if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
> mask = 0xbff;
> @@ -401,6 +390,7 @@ netxen_nic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>
> /* this will be read from FW later */
> adapter->intr_scheme = -1;
> + adapter->msi_mode = -1;
>
> /* This will be reset for mezz cards */
> adapter->portnum = pci_func_id;
> diff --git a/drivers/net/netxen/netxen_nic_phan_reg.h b/drivers/net/netxen/netxen_nic_phan_reg.h
> index ffa3b72..a566b50 100644
> --- a/drivers/net/netxen/netxen_nic_phan_reg.h
> +++ b/drivers/net/netxen/netxen_nic_phan_reg.h
> @@ -126,8 +126,11 @@
> */
> #define CRB_NIC_CAPABILITIES_HOST NETXEN_NIC_REG(0x1a8)
> #define CRB_NIC_CAPABILITIES_FW NETXEN_NIC_REG(0x1dc)
> +#define CRB_NIC_MSI_MODE_HOST NETXEN_NIC_REG(0x270)
> +#define CRB_NIC_MSI_MODE_FW NETXEN_NIC_REG(0x274)
>
> #define INTR_SCHEME_PERPORT 0x1
> +#define MSI_MODE_MULTIFUNC 0x1
>
> /* used for ethtool tests */
> #define CRB_SCRATCHPAD_TEST NETXEN_NIC_REG(0x280)
>
> --
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