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OpenCloudOS-Kernel
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nfp: preallocate RX buffers early in .ndo_open 

We want the .ndo_open() to have following structure:
 - allocate resources;
 - configure HW/FW;
 - enable the device from stack perspective.
Therefore filling RX rings needs to be moved to the beginning
of .ndo_open().

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 19:39:41 +01:00 committed by David S. Miller
parent 1934680f55
commit 114bdef0be
1 changed files with 11 additions and 23 deletions
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34
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
View File

@ -1666,28 +1666,19 @@ static void nfp_net_clear_config_and_disable(struct nfp_net *nn)
* @nn: NFP Net device structure
* @r_vec: Ring vector to be started
*/
static int nfp_net_start_vec(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
static void
nfp_net_start_vec(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
{
unsigned int irq_vec;
int err = 0;
irq_vec = nn->irq_entries[r_vec->irq_idx].vector;
disable_irq(irq_vec);
err = nfp_net_rx_ring_bufs_alloc(r_vec->nfp_net, r_vec->rx_ring);
if (err) {
nn_err(nn, "RV%02d: couldn't allocate enough buffers\n",
r_vec->irq_idx);
goto out;
}
nfp_net_rx_ring_fill_freelist(r_vec->rx_ring);
napi_enable(&r_vec->napi);
out:
enable_irq(irq_vec);
return err;
enable_irq(irq_vec);
}
static int nfp_net_netdev_open(struct net_device *netdev)
@ -1742,6 +1733,10 @@ static int nfp_net_netdev_open(struct net_device *netdev)
err = nfp_net_rx_ring_alloc(nn->r_vecs[r].rx_ring);
if (err)
goto err_free_tx_ring_p;
err = nfp_net_rx_ring_bufs_alloc(nn, nn->r_vecs[r].rx_ring);
if (err)
goto err_flush_rx_ring_p;
}
err = netif_set_real_num_tx_queues(netdev, nn->num_tx_rings);
@ -1814,11 +1809,8 @@ static int nfp_net_netdev_open(struct net_device *netdev)
* - enable all TX queues
* - set link state
*/
for (r = 0; r < nn->num_r_vecs; r++) {
err = nfp_net_start_vec(nn, &nn->r_vecs[r]);
if (err)
goto err_disable_napi;
}
for (r = 0; r < nn->num_r_vecs; r++)
nfp_net_start_vec(nn, &nn->r_vecs[r]);
netif_tx_wake_all_queues(netdev);
@ -1827,18 +1819,14 @@ static int nfp_net_netdev_open(struct net_device *netdev)
return 0;
err_disable_napi:
while (r--) {
napi_disable(&nn->r_vecs[r].napi);
nfp_net_rx_ring_reset(nn->r_vecs[r].rx_ring);
nfp_net_rx_ring_bufs_free(nn, nn->r_vecs[r].rx_ring);
}
err_clear_config:
nfp_net_clear_config_and_disable(nn);
err_free_rings:
r = nn->num_r_vecs;
err_free_prev_vecs:
while (r--) {
nfp_net_rx_ring_bufs_free(nn, nn->r_vecs[r].rx_ring);
err_flush_rx_ring_p:
nfp_net_rx_ring_free(nn->r_vecs[r].rx_ring);
err_free_tx_ring_p:
nfp_net_tx_ring_free(nn->r_vecs[r].tx_ring);