[PATCH net-next 08/14] nfp: add separate buffer allocation function for napi

[Jakub Kicinski]

Introduce a separate buffer allocation function to be called
from NAPI.  We can make assumptions about the context and
buffer size.

Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 23 ++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c 
b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 449ec798a9b7..b43d2dbae368 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1098,6 +1098,26 @@ static void nfp_net_tx_timeout(struct net_device *netdev)
        return frag;
 }
 
+static void *nfp_net_napi_alloc_one(struct nfp_net *nn, dma_addr_t *dma_addr)
+{
+       void *frag;
+
+       frag = napi_alloc_frag(nn->fl_bufsz);
+       if (!frag) {
+               nn_warn_ratelimit(nn, "Failed to alloc receive page frag\n");
+               return NULL;
+       }
+
+       *dma_addr = nfp_net_dma_map_rx(nn, frag, nn->fl_bufsz, DMA_FROM_DEVICE);
+       if (dma_mapping_error(&nn->pdev->dev, *dma_addr)) {
+               skb_free_frag(frag);
+               nn_warn_ratelimit(nn, "Failed to map DMA RX buffer\n");
+               return NULL;
+       }
+
+       return frag;
+}
+
 /**
  * nfp_net_rx_give_one() - Put mapped skb on the software and hardware rings
  * @rx_ring:   RX ring structure
@@ -1413,8 +1433,7 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, 
int budget)
                        nfp_net_rx_drop(r_vec, rx_ring, rxbuf, NULL);
                        continue;
                }
-               new_frag = nfp_net_rx_alloc_one(rx_ring, &new_dma_addr,
-                                               nn->fl_bufsz);
+               new_frag = nfp_net_napi_alloc_one(nn, &new_dma_addr);
                if (unlikely(!new_frag)) {
                        nfp_net_rx_drop(r_vec, rx_ring, rxbuf, skb);
                        continue;
-- 
1.9.1