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Merge branch 'nfp-fix-ethtool-stats-and-page-allocation'

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Jakub Kicinski says:

====================
nfp: fix ethtool stats and page allocation

Two fixes for net.  First one makes sure we handle gather of stats on
32bit machines correctly (ouch).  The second fix solves a potential
NULL-deref if we fail to allocate a page with XDP running.

I used Fixes: tags pointing to where the bug was introduced, but for
patch 1 it has been in the driver "for ever" and fix won't backport
cleanly beyond commit 325945ede6 ("nfp: split software and hardware
vNIC statistics") which is in net.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-10-10 13:18:34 -07:00
commit befc7a3324
2 changed files with 19 additions and 9 deletions
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20
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
View file

@ -1180,10 +1180,14 @@ static void *nfp_net_rx_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)
{
void *frag;
if (!dp->xdp_prog)
if (!dp->xdp_prog) {
frag = netdev_alloc_frag(dp->fl_bufsz);
else
frag = page_address(alloc_page(GFP_KERNEL | __GFP_COLD));
} else {
struct page *page;
page = alloc_page(GFP_KERNEL | __GFP_COLD);
frag = page ? page_address(page) : NULL;
}
if (!frag) {
nn_dp_warn(dp, "Failed to alloc receive page frag\n");
return NULL;
@ -1203,10 +1207,14 @@ static void *nfp_net_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)
{
void *frag;
if (!dp->xdp_prog)
if (!dp->xdp_prog) {
frag = napi_alloc_frag(dp->fl_bufsz);
else
frag = page_address(alloc_page(GFP_ATOMIC | __GFP_COLD));
} else {
struct page *page;
page = alloc_page(GFP_ATOMIC | __GFP_COLD);
frag = page ? page_address(page) : NULL;
}
if (!frag) {
nn_dp_warn(dp, "Failed to alloc receive page frag\n");
return NULL;

8
drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
View file

@ -464,7 +464,7 @@ static u64 *nfp_vnic_get_sw_stats(struct net_device *netdev, u64 *data)
do {
start = u64_stats_fetch_begin(&nn->r_vecs[i].rx_sync);
*data++ = nn->r_vecs[i].rx_pkts;
data[0] = nn->r_vecs[i].rx_pkts;
tmp[0] = nn->r_vecs[i].hw_csum_rx_ok;
tmp[1] = nn->r_vecs[i].hw_csum_rx_inner_ok;
tmp[2] = nn->r_vecs[i].hw_csum_rx_error;
@ -472,14 +472,16 @@ static u64 *nfp_vnic_get_sw_stats(struct net_device *netdev, u64 *data)
do {
start = u64_stats_fetch_begin(&nn->r_vecs[i].tx_sync);
*data++ = nn->r_vecs[i].tx_pkts;
*data++ = nn->r_vecs[i].tx_busy;
data[1] = nn->r_vecs[i].tx_pkts;
data[2] = nn->r_vecs[i].tx_busy;
tmp[3] = nn->r_vecs[i].hw_csum_tx;
tmp[4] = nn->r_vecs[i].hw_csum_tx_inner;
tmp[5] = nn->r_vecs[i].tx_gather;
tmp[6] = nn->r_vecs[i].tx_lso;
} while (u64_stats_fetch_retry(&nn->r_vecs[i].tx_sync, start));
data += 3;
for (j = 0; j < NN_ET_RVEC_GATHER_STATS; j++)
gathered_stats[j] += tmp[j];
}