@@ -439,9 +439,9 @@ struct nfp_stat_pair {
* @bpf_offload_xdp: Offloaded BPF program is XDP
* @chained_metadata_format: Firemware will use new metadata format
* @rx_dma_dir: Mapping direction for RX buffers
+ * @rx_offset: Offset in the RX buffers where packet data starts
* @ctrl: Local copy of the control register/word.
* @fl_bufsz: Currently configured size of the freelist buffers
- * @rx_offset: Offset in the RX buffers where packet data starts
* @xdp_prog: Installed XDP program
* @tx_rings: Array of pre-allocated TX ring structures
* @rx_rings: Array of pre-allocated RX ring structures
@@ -466,11 +466,11 @@ struct nfp_net_dp {
u8 rx_dma_dir;
+ u8 rx_offset;
+
u32 ctrl;
u32 fl_bufsz;
- u32 rx_offset;
-
struct bpf_prog *xdp_prog;
struct nfp_net_tx_ring *tx_rings;
@@ -3124,10 +3124,18 @@ int nfp_net_netdev_init(struct net_device *netdev)
nfp_net_write_mac_addr(nn);
/* Determine RX packet/metadata boundary offset */
- if (nn->fw_ver.major >= 2)
- nn->dp.rx_offset = nn_readl(nn, NFP_NET_CFG_RX_OFFSET);
- else
+ if (nn->fw_ver.major >= 2) {
+ u32 reg;
+
+ reg = nn_readl(nn, NFP_NET_CFG_RX_OFFSET);
+ if (reg > NFP_NET_MAX_PREPEND) {
+ nn_err(nn, "Invalid rx offset: %d\n", reg);
+ return -EINVAL;
+ }
+ nn->dp.rx_offset = reg;
+ } else {
nn->dp.rx_offset = NFP_NET_RX_OFFSET;
+ }
/* Set default MTU and Freelist buffer size */
if (nn->max_mtu < NFP_NET_DEFAULT_MTU)
NFP_NET_CFG_RX_OFFSET is 32bit wide, make sure what we read from there is reasonable for packet headroom. This allows us to store the rx_offset in a 8bit variable. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> --- drivers/net/ethernet/netronome/nfp/nfp_net.h | 6 +++--- drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 14 +++++++++++--- 2 files changed, 14 insertions(+), 6 deletions(-)