Commit b6e97c13 authored by Govindarajulu Varadarajan's avatar Govindarajulu Varadarajan Committed by David S. Miller
Browse files

enic: alloc/free rx_cpu_rmap



rx_cpu_rmap provides the reverse irq cpu affinity. This patch allocates and
sets drivers netdev->rx_cpu_rmap accordingly.

rx_cpu_rmap is set in enic_request_intr() which is called by enic_open and
rx_cpu_rmap is freed in enic_free_intr() which is called by enic_stop.

This is used by Accelerated RFS.
Signed-off-by: default avatarGovindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 63118527
......@@ -39,6 +39,9 @@
#include <linux/prefetch.h>
#include <net/ip6_checksum.h>
#include <linux/ktime.h>
#ifdef CONFIG_RFS_ACCEL
#include <linux/cpu_rmap.h>
#endif
#include "cq_enet_desc.h"
#include "vnic_dev.h"
......@@ -1192,6 +1195,44 @@ static void enic_calc_int_moderation(struct enic *enic, struct vnic_rq *rq)
pkt_size_counter->small_pkt_bytes_cnt = 0;
}
#ifdef CONFIG_RFS_ACCEL
static void enic_free_rx_cpu_rmap(struct enic *enic)
{
free_irq_cpu_rmap(enic->netdev->rx_cpu_rmap);
enic->netdev->rx_cpu_rmap = NULL;
}
static void enic_set_rx_cpu_rmap(struct enic *enic)
{
int i, res;
if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) {
enic->netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(enic->rq_count);
if (unlikely(!enic->netdev->rx_cpu_rmap))
return;
for (i = 0; i < enic->rq_count; i++) {
res = irq_cpu_rmap_add(enic->netdev->rx_cpu_rmap,
enic->msix_entry[i].vector);
if (unlikely(res)) {
enic_free_rx_cpu_rmap(enic);
return;
}
}
}
}
#else
static void enic_free_rx_cpu_rmap(struct enic *enic)
{
}
static void enic_set_rx_cpu_rmap(struct enic *enic)
{
}
#endif /* CONFIG_RFS_ACCEL */
static int enic_poll_msix(struct napi_struct *napi, int budget)
{
struct net_device *netdev = napi->dev;
......@@ -1267,6 +1308,7 @@ static void enic_free_intr(struct enic *enic)
struct net_device *netdev = enic->netdev;
unsigned int i;
enic_free_rx_cpu_rmap(enic);
switch (vnic_dev_get_intr_mode(enic->vdev)) {
case VNIC_DEV_INTR_MODE_INTX:
free_irq(enic->pdev->irq, netdev);
......@@ -1291,6 +1333,7 @@ static int enic_request_intr(struct enic *enic)
unsigned int i, intr;
int err = 0;
enic_set_rx_cpu_rmap(enic);
switch (vnic_dev_get_intr_mode(enic->vdev)) {
case VNIC_DEV_INTR_MODE_INTX:
......
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