From 54f4a22dc1731ef32760eb3a13f7d5a2e889650b Mon Sep 17 00:00:00 2001 From: Qi Zhang Date: Tue, 25 Sep 2018 10:34:29 +0800 Subject: [PATCH] net/i40e/base: improve the polling mechanism This patch fixes the polling mechanism of GLGEN_RSTAT.DEVSTATE in the PF Reset path when Global Reset is in progress. While the driver is polling for the end of the PF Reset and the Global Reset is triggered, abandon the PF Reset path and prepare for the upcoming Global Reset. Cc: stable@dpdk.org Signed-off-by: Qi Zhang Acked-by: Beilei Xing --- drivers/net/i40e/base/i40e_common.c | 35 ++++++++++++++++++++++++----- 1 file changed, 29 insertions(+), 6 deletions(-) diff --git a/drivers/net/i40e/base/i40e_common.c b/drivers/net/i40e/base/i40e_common.c index 18009be3b2..0affa98ac9 100644 --- a/drivers/net/i40e/base/i40e_common.c +++ b/drivers/net/i40e/base/i40e_common.c @@ -1296,6 +1296,29 @@ STATIC enum i40e_media_type i40e_get_media_type(struct i40e_hw *hw) return media; } +/** + * i40e_poll_globr - Poll for Global Reset completion + * @hw: pointer to the hardware structure + * @retry_limit: how many times to retry before failure + **/ +STATIC enum i40e_status_code i40e_poll_globr(struct i40e_hw *hw, + u32 retry_limit) +{ + u32 cnt, reg = 0; + + for (cnt = 0; cnt < retry_limit; cnt++) { + reg = rd32(hw, I40E_GLGEN_RSTAT); + if (!(reg & I40E_GLGEN_RSTAT_DEVSTATE_MASK)) + return I40E_SUCCESS; + i40e_msec_delay(100); + } + + DEBUGOUT("Global reset failed.\n"); + DEBUGOUT1("I40E_GLGEN_RSTAT = 0x%x\n", reg); + + return I40E_ERR_RESET_FAILED; +} + #define I40E_PF_RESET_WAIT_COUNT 200 /** * i40e_pf_reset - Reset the PF @@ -1365,14 +1388,14 @@ enum i40e_status_code i40e_pf_reset(struct i40e_hw *hw) if (!(reg & I40E_PFGEN_CTRL_PFSWR_MASK)) break; reg2 = rd32(hw, I40E_GLGEN_RSTAT); - if (reg2 & I40E_GLGEN_RSTAT_DEVSTATE_MASK) { - DEBUGOUT("Core reset upcoming. Skipping PF reset request.\n"); - DEBUGOUT1("I40E_GLGEN_RSTAT = 0x%x\n", reg2); - return I40E_ERR_NOT_READY; - } + if (reg2 & I40E_GLGEN_RSTAT_DEVSTATE_MASK) + break; i40e_msec_delay(1); } - if (reg & I40E_PFGEN_CTRL_PFSWR_MASK) { + if (reg2 & I40E_GLGEN_RSTAT_DEVSTATE_MASK) { + if (i40e_poll_globr(hw, grst_del) != I40E_SUCCESS) + return I40E_ERR_RESET_FAILED; + } else if (reg & I40E_PFGEN_CTRL_PFSWR_MASK) { DEBUGOUT("PF reset polling failed to complete.\n"); return I40E_ERR_RESET_FAILED; } -- 2.20.1