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nfp: correct desc type when header dma len is 4096

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When there's only one buffer to dma and its length is 4096, then
only one data descriptor is needed to carry it according to current
descriptor definition. So the descriptor type should be `simple`
instead of `gather`, the latter requires more than one descriptor,
otherwise it'll be dropped by application firmware.

Fixes: c10d12e3dce8 ("nfp: add support for NFDK data path")
Fixes: d9d950490a0a ("nfp: nfdk: implement xdp tx path for NFDK")
Signed-off-by: Yinjun Zhang <yinjun.zhang@corigine.com>
Reviewed-by: Richard Donkin <richard.donkin@corigine.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@corigine.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/20221202134646.311108-1-simon.horman@corigine.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Yinjun Zhang 2022-12-02 14:46:46 +01:00 committed by Jakub Kicinski
parent 6a30d3e349
commit 5c306de8f7
1 changed files with 3 additions and 3 deletions
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6
drivers/net/ethernet/netronome/nfp/nfdk/dp.c
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@ -282,7 +282,7 @@ netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev)
dma_len = skb_headlen(skb);
if (skb_is_gso(skb))
type = NFDK_DESC_TX_TYPE_TSO;
else if (!nr_frags && dma_len < NFDK_TX_MAX_DATA_PER_HEAD)
else if (!nr_frags && dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
type = NFDK_DESC_TX_TYPE_SIMPLE;
else
type = NFDK_DESC_TX_TYPE_GATHER;
@ -927,7 +927,7 @@ nfp_nfdk_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring,
dma_len = pkt_len;
dma_addr = rxbuf->dma_addr + dma_off;
if (dma_len < NFDK_TX_MAX_DATA_PER_HEAD)
if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
type = NFDK_DESC_TX_TYPE_SIMPLE;
else
type = NFDK_DESC_TX_TYPE_GATHER;
@ -1325,7 +1325,7 @@ nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
txbuf = &tx_ring->ktxbufs[wr_idx];
dma_len = skb_headlen(skb);
if (dma_len < NFDK_TX_MAX_DATA_PER_HEAD)
if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
type = NFDK_DESC_TX_TYPE_SIMPLE;
else
type = NFDK_DESC_TX_TYPE_GATHER;