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driver: net: nvethernet: Re-order functions in ether_open()

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Issue: In ether_open(), following issues are noted:
       1. ether_ptp_init() is called after starting MAC,
       which could cause some PTP packets to be missed.
       2. napi handlers are not enabled before requesting
       irq/starting MAC. This can cause issues if irq is
       raised immediately (if irq becomes shared in some
       platform) after it is requested.
       3. ether_request_irq() is called before DMA resources
       are initialized. This will also cause problem if irq
       is raised immediately.

Fix:   Move and re-order function invocations in ether_open()
       so that driver is ready to go (DMA resources allocated,
       napi handlers enabled etc.) by the time irq is requested/
       MAC is started for Rx/Tx.

Bug 2715330

Change-Id: I491251c8e749ccad2890ad0d113c87aaf3d87b42
Signed-off-by: Srinivas Ramachandran <srinivasra@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2211091
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>
Tested-by: Bitan Biswas <bbiswas@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Srinivas Ramachandran
2019-09-30 13:55:03 -07:00
committed by Revanth Kumar Uppala
parent 7bbf31a2a7
commit 05e0c8f037
1 changed files with 18 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/net/ethernet/nvidia/nvethernet/ether_linux.c
View File

@@ -1212,15 +1212,6 @@ static int ether_open(struct net_device *dev)
goto err_phy_init;
}
/* request tx/rx/common irq */
ret = ether_request_irqs(pdata);
if (ret < 0) {
dev_err(&dev->dev,
"%s: failed to get tx rx irqs with reason %d\n",
__func__, ret);
goto err_r_irq;
}
osi_set_rx_buf_len(pdata->osi_dma);
ret = ether_allocate_dma_resources(pdata);
@@ -1265,9 +1256,6 @@ static int ether_open(struct net_device *dev)
pdata->l3_l4_filter = OSI_DISABLE;
pdata->l2_filtering_mode = OSI_PERFECT_FILTER_MODE;
/* Start the MAC */
osi_start_mac(pdata->osi_core);
/* Initialize PTP */
ret = ether_ptp_init(pdata);
if (ret < 0) {
@@ -1277,8 +1265,21 @@ static int ether_open(struct net_device *dev)
goto err_hw_init;
}
/* Enable napi before requesting irq to be ready to handle it */
ether_napi_enable(pdata);
/* request tx/rx/common irq */
ret = ether_request_irqs(pdata);
if (ret < 0) {
dev_err(&dev->dev,
"%s: failed to get tx rx irqs with reason %d\n",
__func__, ret);
goto err_r_irq;
}
/* Start the MAC */
osi_start_mac(pdata->osi_core);
/* start PHY */
phy_start(pdata->phydev);
@@ -1290,6 +1291,9 @@ static int ether_open(struct net_device *dev)
return ret;
err_r_irq:
ether_napi_disable(pdata);
ether_ptp_remove(pdata);
err_hw_init:
#ifdef THERMAL_CAL
thermal_cooling_device_unregister(pdata->tcd);
@@ -1297,8 +1301,6 @@ err_therm:
#endif /* THERMAL_CAL */
free_dma_resources(pdata->osi_dma, pdata->dev);
err_alloc:
ether_free_irqs(pdata);
err_r_irq:
if (pdata->phydev) {
phy_disconnect(pdata->phydev);
}
@@ -3650,10 +3652,10 @@ static int ether_resume(struct ether_priv_data *pdata)
goto err_dma;
}
/* start the mac */
osi_start_mac(osi_core);
/* enable NAPI */
ether_napi_enable(pdata);
/* start the mac */
osi_start_mac(osi_core);
/* start phy */
phy_start(pdata->phydev);
/* start network queues */