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Message-ID: <20090625183134.40e8fd7a@leela>
Date: Thu, 25 Jun 2009 18:31:34 +0200
From: Michal Schmidt <mschmidt@...hat.com>
To: Ramkrishna Vepa <ram.vepa@...erion.com>
Cc: netdev@...r.kernel.org
Subject: [PATCH] vxge: fix GRO receive with INTA interrupts
TCP receiving in vxge is extremely slow when using INTA interrupts.
The bug is that vxge_poll_inta() receives frames on ring->napi's
gro_list, but never flushes GRO for this napi_struct, because there's
a second napi_struct in struct vxgedev.
There's no need for the second napi_struct. We can use ring->napi
only. When vxge has to fallback to INTA, we know there will be exactly
one vpath (and exactly one vxge_ring). This change results in a cleanup
too.
Tested successfully with netperf, booted with and without pci=nomsi.
Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
commit c60c53194a4ed435294fffba239a0b264e208483
Author: Michal Schmidt <mschmidt@...hat.com>
Date: Thu Jun 25 15:06:57 2009 +0200
vxge: missing GRO flush when using INTA
Fixes very slow TCP.
diff --git a/drivers/net/vxge/vxge-main.c b/drivers/net/vxge/vxge-main.c
index 6034497..6132ef4 100644
--- a/drivers/net/vxge/vxge-main.c
+++ b/drivers/net/vxge/vxge-main.c
@@ -1660,7 +1660,7 @@ int vxge_reset(struct vxgedev *vdev)
/**
* vxge_poll - Receive handler when Receive Polling is used.
- * @dev: pointer to the device structure.
+ * @napi: pointer to the NAPI structure.
* @budget: Number of packets budgeted to be processed in this iteration.
*
* This function comes into picture only if Receive side is being handled
@@ -1672,14 +1672,12 @@ int vxge_reset(struct vxgedev *vdev)
*/
static int vxge_poll_msix(struct napi_struct *napi, int budget)
{
- struct vxge_ring *ring =
- container_of(napi, struct vxge_ring, napi);
- int budget_org = budget;
- ring->budget = budget;
+ struct vxge_ring *ring = container_of(napi, struct vxge_ring, napi);
+ ring->budget = budget;
vxge_hw_vpath_poll_rx(ring->handle);
- if (ring->pkts_processed < budget_org) {
+ if (ring->pkts_processed < budget) {
napi_complete(napi);
/* Re enable the Rx interrupts for the vpath */
vxge_hw_channel_msix_unmask(
@@ -1692,35 +1690,24 @@ static int vxge_poll_msix(struct napi_struct *napi, int budget)
static int vxge_poll_inta(struct napi_struct *napi, int budget)
{
- struct vxgedev *vdev = container_of(napi, struct vxgedev, napi);
- int pkts_processed = 0;
- int i;
- int budget_org = budget;
- struct vxge_ring *ring;
-
- struct __vxge_hw_device *hldev = (struct __vxge_hw_device *)
- pci_get_drvdata(vdev->pdev);
+ struct vxge_ring *ring = container_of(napi, struct vxge_ring, napi);
+ struct vxge_vpath *vpath = container_of(ring, struct vxge_vpath, ring);
+ struct vxgedev *vdev = vpath->vdev;
- for (i = 0; i < vdev->no_of_vpath; i++) {
- ring = &vdev->vpaths[i].ring;
- ring->budget = budget;
- vxge_hw_vpath_poll_rx(ring->handle);
- pkts_processed += ring->pkts_processed;
- budget -= ring->pkts_processed;
- if (budget <= 0)
- break;
- }
+ ring->budget = budget;
+ vxge_hw_vpath_poll_rx(ring->handle);
VXGE_COMPLETE_ALL_TX(vdev);
- if (pkts_processed < budget_org) {
+ if (ring->pkts_processed < budget) {
+ struct __vxge_hw_device *hldev = vdev->devh;
napi_complete(napi);
/* Re enable the Rx interrupts for the ring */
vxge_hw_device_unmask_all(hldev);
vxge_hw_device_flush_io(hldev);
}
- return pkts_processed;
+ return ring->pkts_processed;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
@@ -2165,7 +2152,7 @@ static irqreturn_t vxge_isr_napi(int irq, void *dev_id)
(64 - VXGE_HW_MAX_VIRTUAL_PATHS))) {
vxge_hw_device_clear_tx_rx(hldev);
- napi_schedule(&vdev->napi);
+ napi_schedule(&vdev->vpaths[0].ring.napi);
vxge_debug_intr(VXGE_TRACE,
"%s:%d Exiting...", __func__, __LINE__);
return IRQ_HANDLED;
@@ -2707,17 +2694,12 @@ vxge_open(struct net_device *dev)
goto out1;
}
-
- if (vdev->config.intr_type != MSI_X) {
- netif_napi_add(dev, &vdev->napi, vxge_poll_inta,
+ for (i = 0; i < vdev->no_of_vpath; i++) {
+ netif_napi_add(dev, &vdev->vpaths[i].ring.napi,
+ vdev->config.intr_type == MSI_X ?
+ vxge_poll_msix : vxge_poll_inta,
vdev->config.napi_weight);
- napi_enable(&vdev->napi);
- } else {
- for (i = 0; i < vdev->no_of_vpath; i++) {
- netif_napi_add(dev, &vdev->vpaths[i].ring.napi,
- vxge_poll_msix, vdev->config.napi_weight);
- napi_enable(&vdev->vpaths[i].ring.napi);
- }
+ napi_enable(&vdev->vpaths[i].ring.napi);
}
/* configure RTH */
@@ -2835,13 +2817,8 @@ out2:
vxge_rem_isr(vdev);
/* Disable napi */
- if (vdev->config.intr_type != MSI_X)
- napi_disable(&vdev->napi);
- else {
- for (i = 0; i < vdev->no_of_vpath; i++)
- napi_disable(&vdev->vpaths[i].ring.napi);
- }
-
+ for (i = 0; i < vdev->no_of_vpath; i++)
+ napi_disable(&vdev->vpaths[i].ring.napi);
out1:
vxge_close_vpaths(vdev, 0);
out0:
@@ -2868,13 +2845,8 @@ void vxge_free_mac_add_list(struct vxge_vpath *vpath)
static void vxge_napi_del_all(struct vxgedev *vdev)
{
int i;
- if (vdev->config.intr_type != MSI_X)
- netif_napi_del(&vdev->napi);
- else {
- for (i = 0; i < vdev->no_of_vpath; i++)
- netif_napi_del(&vdev->vpaths[i].ring.napi);
- }
- return;
+ for (i = 0; i < vdev->no_of_vpath; i++)
+ netif_napi_del(&vdev->vpaths[i].ring.napi);
}
int do_vxge_close(struct net_device *dev, int do_io)
@@ -2940,12 +2912,8 @@ int do_vxge_close(struct net_device *dev, int do_io)
del_timer_sync(&vdev->vp_reset_timer);
/* Disable napi */
- if (vdev->config.intr_type != MSI_X)
- napi_disable(&vdev->napi);
- else {
- for (i = 0; i < vdev->no_of_vpath; i++)
- napi_disable(&vdev->vpaths[i].ring.napi);
- }
+ for (i = 0; i < vdev->no_of_vpath; i++)
+ napi_disable(&vdev->vpaths[i].ring.napi);
netif_carrier_off(vdev->ndev);
printk(KERN_NOTICE "%s: Link Down\n", vdev->ndev->name);
diff --git a/drivers/net/vxge/vxge-main.h b/drivers/net/vxge/vxge-main.h
index 9704b2b..2b6a2ea 100644
--- a/drivers/net/vxge/vxge-main.h
+++ b/drivers/net/vxge/vxge-main.h
@@ -348,7 +348,6 @@ struct vxgedev {
int max_vpath_supported;
int no_of_vpath;
- struct napi_struct napi;
/* A debug option, when enabled and if error condition occurs,
* the driver will do following steps:
* - mask all interrupts
--
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