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From: Bruce Richardson <bruce.richardson@intel.com>
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH v3 2/3] eal: add interrupt enable/disable routines for uio_pci_generic
Date: Fri, 20 Feb 2015 16:59:16 +0000	[thread overview]
Message-ID: <1424451557-27419-3-git-send-email-bruce.richardson@intel.com> (raw)
In-Reply-To: <1424451557-27419-1-git-send-email-bruce.richardson@intel.com>

From: Zhou Danny <danny.zhou@intel.com>

enable/disable interrupt by manipulating a control bit of command
register on NIC's PCIe configuration space.

Signed-off-by: Danny Zhou <danny.zhou@intel.com>
Tested-by: Qun Wan <qun.wan@intel.com>
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 lib/librte_eal/linuxapp/eal/eal_interrupts.c | 68 +++++++++++++++++++++-------
 1 file changed, 52 insertions(+), 16 deletions(-)

diff --git a/lib/librte_eal/linuxapp/eal/eal_interrupts.c b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
index dc2668a..8c5b834 100644
--- a/lib/librte_eal/linuxapp/eal/eal_interrupts.c
+++ b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
@@ -361,6 +361,54 @@ vfio_disable_msix(struct rte_intr_handle *intr_handle) {
 }
 #endif
 
+static int
+uio_intr_disable(struct rte_intr_handle *intr_handle)
+{
+	unsigned char command_high;
+
+	/* use UIO config file descriptor for uio_pci_generic */
+	if (pread(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
+		RTE_LOG(ERR, EAL,
+			"Error reading interrupts status for fd %d\n",
+			intr_handle->uio_cfg_fd);
+		return -1;
+	}
+	/* disable interrupts */
+	command_high |= 0x4;
+	if (pwrite(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
+		RTE_LOG(ERR, EAL,
+			"Error disabling interrupts for fd %d\n",
+			intr_handle->uio_cfg_fd);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int
+uio_intr_enable(struct rte_intr_handle *intr_handle)
+{
+	unsigned char command_high;
+
+	/* use UIO config file descriptor for uio_pci_generic */
+	if (pread(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
+		RTE_LOG(ERR, EAL,
+			"Error reading interrupts status for fd %d\n",
+			intr_handle->uio_cfg_fd);
+		return -1;
+	}
+	/* enable interrupts */
+	command_high &= ~0x4;
+	if (pwrite(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
+		RTE_LOG(ERR, EAL,
+			"Error enabling interrupts for fd %d\n",
+			intr_handle->uio_cfg_fd);
+		return -1;
+	}
+
+	return 0;
+}
+
 int
 rte_intr_callback_register(struct rte_intr_handle *intr_handle,
 			rte_intr_callback_fn cb, void *cb_arg)
@@ -500,20 +548,14 @@ rte_intr_callback_unregister(struct rte_intr_handle *intr_handle,
 int
 rte_intr_enable(struct rte_intr_handle *intr_handle)
 {
-	const int value = 1;
-
-	if (!intr_handle || intr_handle->fd < 0)
+	if (!intr_handle || intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0)
 		return -1;
 
 	switch (intr_handle->type){
 	/* write to the uio fd to enable the interrupt */
 	case RTE_INTR_HANDLE_UIO:
-		if (write(intr_handle->fd, &value, sizeof(value)) < 0) {
-			RTE_LOG(ERR, EAL,
-				"Error enabling interrupts for fd %d\n",
-							intr_handle->fd);
+		if (uio_intr_enable(intr_handle))
 			return -1;
-		}
 		break;
 	/* not used at this moment */
 	case RTE_INTR_HANDLE_ALARM:
@@ -546,20 +588,14 @@ rte_intr_enable(struct rte_intr_handle *intr_handle)
 int
 rte_intr_disable(struct rte_intr_handle *intr_handle)
 {
-	const int value = 0;
-
-	if (!intr_handle || intr_handle->fd < 0)
+	if (!intr_handle || intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0)
 		return -1;
 
 	switch (intr_handle->type){
 	/* write to the uio fd to disable the interrupt */
 	case RTE_INTR_HANDLE_UIO:
-		if (write(intr_handle->fd, &value, sizeof(value)) < 0){
-			RTE_LOG(ERR, EAL,
-				"Error disabling interrupts for fd %d\n",
-							intr_handle->fd);
+		if (uio_intr_disable(intr_handle))
 			return -1;
-		}
 		break;
 	/* not used at this moment */
 	case RTE_INTR_HANDLE_ALARM:
-- 
2.1.0

  parent reply	other threads:[~2015-02-20 16:59 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-19 17:08 [dpdk-dev] [PATCH v2 0/3] Enable uio_pci_generic support Zhou Danny
2015-02-19 17:08 ` [dpdk-dev] [PATCH v2 1/3] eal: enable " Zhou Danny
2015-02-20  9:01   ` Thomas Monjalon
2015-02-20 10:15     ` Bruce Richardson
2015-02-19 17:08 ` [dpdk-dev] [PATCH v2 2/3] eal: add interrupt enable/disable routines for uio_pci_generic Zhou Danny
2015-02-19 17:08 ` [dpdk-dev] [PATCH v2 3/3] tools: enable binding NIC device to uio_pci_generic Zhou Danny
2015-02-20 16:59 ` [dpdk-dev] [PATCH v3 0/3] enable uio_pci_generic support Bruce Richardson
2015-02-20 16:59   ` [dpdk-dev] [PATCH v3 1/3] eal: " Bruce Richardson
2015-02-23 15:24     ` David Marchand
2015-02-20 16:59   ` Bruce Richardson [this message]
2015-02-20 16:59   ` [dpdk-dev] [PATCH v3 3/3] tools: enable binding NIC device to uio_pci_generic Bruce Richardson
2015-02-20 17:44   ` [dpdk-dev] [PATCH v3 0/3] enable uio_pci_generic support Declan Doherty
2015-02-20 22:35     ` Thomas Monjalon

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