nfp: reorganize pkt_off variable

Rename pkt_off variable to dma_off, it should hold data offset
counting from beginning of DMA mapping.  Compute the value only
in XDP context.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 513f55d..0e4fa68 100644 (file)
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1453,7 +1453,7 @@ nfp_net_rx_drop(struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring,
 static bool
 nfp_net_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring,
                   struct nfp_net_tx_ring *tx_ring,
-                  struct nfp_net_rx_buf *rxbuf, unsigned int pkt_off,
+                  struct nfp_net_rx_buf *rxbuf, unsigned int dma_off,
                   unsigned int pkt_len)
 {
        struct nfp_net_tx_buf *txbuf;
@@ -1484,14 +1484,14 @@ nfp_net_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring,
        txbuf->pkt_cnt = 1;
        txbuf->real_len = pkt_len;
 
-       dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + pkt_off,
+       dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off,
                                   pkt_len, DMA_BIDIRECTIONAL);
 
        /* Build TX descriptor */
        txd = &tx_ring->txds[wr_idx];
        txd->offset_eop = PCIE_DESC_TX_EOP;
        txd->dma_len = cpu_to_le16(pkt_len);
-       nfp_desc_set_dma_addr(txd, rxbuf->dma_addr + pkt_off);
+       nfp_desc_set_dma_addr(txd, rxbuf->dma_addr + dma_off);
        txd->data_len = cpu_to_le16(pkt_len);
 
        txd->flags = 0;
@@ -1541,7 +1541,7 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
        tx_ring = r_vec->xdp_ring;
 
        while (pkts_polled < budget) {
-               unsigned int meta_len, data_len, data_off, pkt_len, pkt_off;
+               unsigned int meta_len, data_len, data_off, pkt_len;
                struct nfp_net_rx_buf *rxbuf;
                struct nfp_net_rx_desc *rxd;
                dma_addr_t new_dma_addr;
@@ -1579,10 +1579,9 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
                pkt_len = data_len - meta_len;
 
                if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
-                       pkt_off = meta_len;
+                       data_off = NFP_NET_RX_BUF_HEADROOM + meta_len;
                else
-                       pkt_off = dp->rx_offset;
-               data_off = NFP_NET_RX_BUF_HEADROOM + pkt_off;
+                       data_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_offset;
 
                /* Stats update */
                u64_stats_update_begin(&r_vec->rx_sync);
@@ -1592,10 +1591,12 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
 
                if (xdp_prog && !(rxd->rxd.flags & PCIE_DESC_RX_BPF &&
                                  dp->bpf_offload_xdp)) {
+                       unsigned int dma_off;
                        int act;
 
+                       dma_off = data_off - NFP_NET_RX_BUF_HEADROOM;
                        dma_sync_single_for_cpu(dp->dev,
-                                               rxbuf->dma_addr + pkt_off,
+                                               rxbuf->dma_addr + dma_off,
                                                pkt_len, DMA_BIDIRECTIONAL);
                        act = nfp_net_run_xdp(xdp_prog, rxbuf->frag + data_off,
                                              pkt_len);
@@ -1605,7 +1606,7 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
                        case XDP_TX:
                                if (unlikely(!nfp_net_tx_xdp_buf(dp, rx_ring,
                                                                 tx_ring, rxbuf,
-                                                                pkt_off,
+                                                                dma_off,
                                                                 pkt_len)))
                                        trace_xdp_exception(dp->netdev,
                                                            xdp_prog, act);