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nfp: sync ring state during FW reconfiguration 

FW reconfiguration in .ndo_open()/.ndo_stop() should reset/
restore queue state.  Since we need IRQs to be disabled when
filling rings on RX path we have to move disable_irq() from
.ndo_open() all the way up to IRQ allocation.

nfp_net_start_vec() becomes trivial now so it's inlined.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2016-04-07 19:39:44 +01:00 committed by David S. Miller
parent 1cd0cfc498
commit aba52df80b
1 changed files with 16 additions and 29 deletions
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45
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
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@ -1519,6 +1519,7 @@ nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
nn_err(nn, "Error requesting IRQ %d\n", entry->vector);
return err;
}
disable_irq(entry->vector);
/* Setup NAPI */
netif_napi_add(nn->netdev, &r_vec->napi,
@ -1647,13 +1648,14 @@ static void nfp_net_clear_config_and_disable(struct nfp_net *nn)
nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
err = nfp_net_reconfig(nn, update);
if (err) {
if (err)
nn_err(nn, "Could not disable device: %d\n", err);
return;
}
for (r = 0; r < nn->num_r_vecs; r++)
for (r = 0; r < nn->num_r_vecs; r++) {
nfp_net_rx_ring_reset(nn->r_vecs[r].rx_ring);
nfp_net_tx_ring_reset(nn, nn->r_vecs[r].tx_ring);
nfp_net_vec_clear_ring_data(nn, r);
}
nn->ctrl = new_ctrl;
}
@ -1721,6 +1723,9 @@ static int __nfp_net_set_config_and_enable(struct nfp_net *nn)
nn->ctrl = new_ctrl;
for (r = 0; r < nn->num_r_vecs; r++)
nfp_net_rx_ring_fill_freelist(nn->r_vecs[r].rx_ring);
/* Since reconfiguration requests while NFP is down are ignored we
* have to wipe the entire VXLAN configuration and reinitialize it.
*/
@ -1748,26 +1753,6 @@ static int nfp_net_set_config_and_enable(struct nfp_net *nn)
return err;
}
/**
* nfp_net_start_vec() - Start ring vector
* @nn: NFP Net device structure
* @r_vec: Ring vector to be started
*/
static void
nfp_net_start_vec(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
{
unsigned int irq_vec;
irq_vec = nn->irq_entries[r_vec->irq_idx].vector;
disable_irq(irq_vec);
nfp_net_rx_ring_fill_freelist(r_vec->rx_ring);
napi_enable(&r_vec->napi);
enable_irq(irq_vec);
}
/**
* nfp_net_open_stack() - Start the device from stack's perspective
* @nn: NFP Net device to reconfigure
@ -1776,8 +1761,10 @@ static void nfp_net_open_stack(struct nfp_net *nn)
{
unsigned int r;
for (r = 0; r < nn->num_r_vecs; r++)
nfp_net_start_vec(nn, &nn->r_vecs[r]);
for (r = 0; r < nn->num_r_vecs; r++) {
napi_enable(&nn->r_vecs[r].napi);
enable_irq(nn->irq_entries[nn->r_vecs[r].irq_idx].vector);
}
netif_tx_wake_all_queues(nn->netdev);
@ -1902,8 +1889,10 @@ static void nfp_net_close_stack(struct nfp_net *nn)
netif_carrier_off(nn->netdev);
nn->link_up = false;
for (r = 0; r < nn->num_r_vecs; r++)
for (r = 0; r < nn->num_r_vecs; r++) {
disable_irq(nn->irq_entries[nn->r_vecs[r].irq_idx].vector);
napi_disable(&nn->r_vecs[r].napi);
}
netif_tx_disable(nn->netdev);
}
@ -1917,9 +1906,7 @@ static void nfp_net_close_free_all(struct nfp_net *nn)
unsigned int r;
for (r = 0; r < nn->num_r_vecs; r++) {
nfp_net_rx_ring_reset(nn->r_vecs[r].rx_ring);
nfp_net_rx_ring_bufs_free(nn, nn->r_vecs[r].rx_ring);
nfp_net_tx_ring_reset(nn, nn->r_vecs[r].tx_ring);
nfp_net_rx_ring_free(nn->r_vecs[r].rx_ring);
nfp_net_tx_ring_free(nn->r_vecs[r].tx_ring);
nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);