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From: Beilei Xing <beilei.xing@intel.com>
To: wenzhuo.lu@intel.com
Cc: dev@dpdk.org, Beilei Xing <beilei.xing@intel.com>
Date: Tue, 14 Jun 2016 14:59:45 +0800
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Subject: [dpdk-dev] [PATCH v2 19/30] ixgbe/base: fix possible race issue
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This patch fixes possible race issue between ports when issuing host
interface command by acquiring/releasing the management host interface
semaphore in ixgbe_host_interface_command.
Fixes: 36f43e8679ae ("ixgbe/base: refactor manageability block communication")
Signed-off-by: Beilei Xing <beilei.xing@intel.com>
---
drivers/net/ixgbe/base/ixgbe_common.c | 40 ++++++++++++++++++++---------------
1 file changed, 23 insertions(+), 17 deletions(-)
diff --git a/drivers/net/ixgbe/base/ixgbe_common.c b/drivers/net/ixgbe/base/ixgbe_common.c
index 0a74714..0a708cf 100644
--- a/drivers/net/ixgbe/base/ixgbe_common.c
+++ b/drivers/net/ixgbe/base/ixgbe_common.c
@@ -4373,8 +4373,9 @@ u8 ixgbe_calculate_checksum(u8 *buffer, u32 length)
* So we will leave this up to the caller to read back the data
* in these cases.
*
- * Communicates with the manageability block. On success return IXGBE_SUCCESS
- * else return IXGBE_ERR_HOST_INTERFACE_COMMAND.
+ * Communicates with the manageability block. On success return IXGBE_SUCCESS
+ * else returns semaphore error when encountering an error acquiring
+ * semaphore or IXGBE_ERR_HOST_INTERFACE_COMMAND when command fails.
**/
s32 ixgbe_host_interface_command(struct ixgbe_hw *hw, u32 *buffer,
u32 length, u32 timeout, bool return_data)
@@ -4383,6 +4384,7 @@ s32 ixgbe_host_interface_command(struct ixgbe_hw *hw, u32 *buffer,
u32 hdr_size = sizeof(struct ixgbe_hic_hdr);
u16 buf_len;
u16 dword_len;
+ s32 status;
DEBUGFUNC("ixgbe_host_interface_command");
@@ -4390,6 +4392,11 @@ s32 ixgbe_host_interface_command(struct ixgbe_hw *hw, u32 *buffer,
DEBUGOUT1("Buffer length failure buffersize=%d.\n", length);
return IXGBE_ERR_HOST_INTERFACE_COMMAND;
}
+ /* Take management host interface semaphore */
+ status = hw->mac.ops.acquire_swfw_sync(hw, IXGBE_GSSR_SW_MNG_SM);
+
+ if (status)
+ return status;
/* Set bit 9 of FWSTS clearing FW reset indication */
fwsts = IXGBE_READ_REG(hw, IXGBE_FWSTS);
@@ -4399,13 +4406,15 @@ s32 ixgbe_host_interface_command(struct ixgbe_hw *hw, u32 *buffer,
hicr = IXGBE_READ_REG(hw, IXGBE_HICR);
if ((hicr & IXGBE_HICR_EN) == 0) {
DEBUGOUT("IXGBE_HOST_EN bit disabled.\n");
- return IXGBE_ERR_HOST_INTERFACE_COMMAND;
+ status = IXGBE_ERR_HOST_INTERFACE_COMMAND;
+ goto rel_out;
}
/* Calculate length in DWORDs. We must be DWORD aligned */
if ((length % (sizeof(u32))) != 0) {
DEBUGOUT("Buffer length failure, not aligned to dword");
- return IXGBE_ERR_INVALID_ARGUMENT;
+ status = IXGBE_ERR_INVALID_ARGUMENT;
+ goto rel_out;
}
dword_len = length >> 2;
@@ -4432,11 +4441,12 @@ s32 ixgbe_host_interface_command(struct ixgbe_hw *hw, u32 *buffer,
!(IXGBE_READ_REG(hw, IXGBE_HICR) & IXGBE_HICR_SV)) {
ERROR_REPORT1(IXGBE_ERROR_CAUTION,
"Command has failed with no status valid.\n");
- return IXGBE_ERR_HOST_INTERFACE_COMMAND;
+ status = IXGBE_ERR_HOST_INTERFACE_COMMAND;
+ goto rel_out;
}
if (!return_data)
- return 0;
+ goto rel_out;
/* Calculate length in DWORDs */
dword_len = hdr_size >> 2;
@@ -4450,11 +4460,12 @@ s32 ixgbe_host_interface_command(struct ixgbe_hw *hw, u32 *buffer,
/* If there is any thing in data position pull it in */
buf_len = ((struct ixgbe_hic_hdr *)buffer)->buf_len;
if (buf_len == 0)
- return 0;
+ goto rel_out;
if (length < buf_len + hdr_size) {
DEBUGOUT("Buffer not large enough for reply message.\n");
- return IXGBE_ERR_HOST_INTERFACE_COMMAND;
+ status = IXGBE_ERR_HOST_INTERFACE_COMMAND;
+ goto rel_out;
}
/* Calculate length in DWORDs, add 3 for odd lengths */
@@ -4466,7 +4477,10 @@ s32 ixgbe_host_interface_command(struct ixgbe_hw *hw, u32 *buffer,
IXGBE_LE32_TO_CPUS(&buffer[bi]);
}
- return 0;
+rel_out:
+ hw->mac.ops.release_swfw_sync(hw, IXGBE_GSSR_SW_MNG_SM);
+
+ return status;
}
/**
@@ -4491,12 +4505,6 @@ s32 ixgbe_set_fw_drv_ver_generic(struct ixgbe_hw *hw, u8 maj, u8 min,
DEBUGFUNC("ixgbe_set_fw_drv_ver_generic");
- if (hw->mac.ops.acquire_swfw_sync(hw, IXGBE_GSSR_SW_MNG_SM)
- != IXGBE_SUCCESS) {
- ret_val = IXGBE_ERR_SWFW_SYNC;
- goto out;
- }
-
fw_cmd.hdr.cmd = FW_CEM_CMD_DRIVER_INFO;
fw_cmd.hdr.buf_len = FW_CEM_CMD_DRIVER_INFO_LEN;
fw_cmd.hdr.cmd_or_resp.cmd_resv = FW_CEM_CMD_RESERVED;
@@ -4528,8 +4536,6 @@ s32 ixgbe_set_fw_drv_ver_generic(struct ixgbe_hw *hw, u8 maj, u8 min,
break;
}
- hw->mac.ops.release_swfw_sync(hw, IXGBE_GSSR_SW_MNG_SM);
-out:
return ret_val;
}
--
2.5.0