[PATCH net-next v4 15/33] ena: add XDP frame size to amazon NIC driver

Jesper Dangaard Brouer
2020-05-14T10:50:23Z

Frame size ENA_PAGE_SIZE is limited to 16K on systems with larger
PAGE_SIZE than 16K. Change ENA_XDP_MAX_MTU to also take into account
the reserved tailroom.

Cc: Arthur Kiyanovski <akiyano@amazon.com>
Acked-by: Sameeh Jubran <sameehj@amazon.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
---
drivers/net/ethernet/amazon/ena/ena_netdev.c | 1 +
drivers/net/ethernet/amazon/ena/ena_netdev.h | 5 +++--
2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 2818965427e9..85b87ed02dd5 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -1606,6 +1606,7 @@ static int ena_clean_rx_irq(struct ena_ring *rx_ring, struct napi_struct *napi,
"%s qid %d\n", __func__, rx_ring->qid);
res_budget = budget;
xdp.rxq = &rx_ring->xdp_rxq;
+ xdp.frame_sz = ENA_PAGE_SIZE;

do {
xdp_verdict = XDP_PASS;
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.h b/drivers/net/ethernet/amazon/ena/ena_netdev.h
index 7df67bf09b93..680099afcccf 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.h
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.h
@@ -151,8 +151,9 @@
* The buffer size we share with the device is defined to be ENA_PAGE_SIZE
*/

-#define ENA_XDP_MAX_MTU (ENA_PAGE_SIZE - ETH_HLEN - ETH_FCS_LEN - \
- VLAN_HLEN - XDP_PACKET_HEADROOM)
+#define ENA_XDP_MAX_MTU (ENA_PAGE_SIZE - ETH_HLEN - ETH_FCS_LEN - \
+ VLAN_HLEN - XDP_PACKET_HEADROOM - \
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))

#define ENA_IS_XDP_INDEX(adapter, index) (((index) >= (adapter)->xdp_first_ring) && \
((index) < (adapter)->xdp_first_ring + (adapter)->xdp_num_queues))