From c6fbbf1eae8f35e10966826960e154c9596c86dc Mon Sep 17 00:00:00 2001 From: Fei Qin Date: Wed, 1 Jun 2022 10:34:49 +0200 Subject: [PATCH] nfp: remove padding in nfp_nfdk_tx_desc NFDK firmware supports 48-bit dma addressing and parses 16 high bits of dma addresses. In nfp_nfdk_tx_desc, dma related structure and tso related structure are union. When "mss" be filled with nonzero value due to enable tso, the memory used by "padding" may be also filled. Then, firmware may parse wrong dma addresses which causes TX watchdog timeout problem. This patch removes padding and unifies the dma_addr_hi bits with the one in firmware. nfp_nfdk_tx_desc_set_dma_addr is also added to match this change. Fixes: c10d12e3dce8 ("nfp: add support for NFDK data path") Signed-off-by: Fei Qin Signed-off-by: Yinjun Zhang Signed-off-by: Louis Peens Signed-off-by: Simon Horman Link: https://lore.kernel.org/r/20220601083449.50556-1-simon.horman@corigine.com Signed-off-by: Paolo Abeni --- drivers/net/ethernet/netronome/nfp/nfdk/dp.c | 12 ++++++------ drivers/net/ethernet/netronome/nfp/nfdk/nfdk.h | 3 +-- drivers/net/ethernet/netronome/nfp/nfp_net.h | 11 ++++++++++- 3 files changed, 17 insertions(+), 9 deletions(-) diff --git a/drivers/net/ethernet/netronome/nfp/nfdk/dp.c b/drivers/net/ethernet/netronome/nfp/nfdk/dp.c index e3da9ac..e509d6d 100644 --- a/drivers/net/ethernet/netronome/nfp/nfdk/dp.c +++ b/drivers/net/ethernet/netronome/nfp/nfdk/dp.c @@ -314,7 +314,7 @@ netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev) FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); txd->dma_len_type = cpu_to_le16(dlen_type); - nfp_desc_set_dma_addr(txd, dma_addr); + nfp_nfdk_tx_desc_set_dma_addr(txd, dma_addr); /* starts at bit 0 */ BUILD_BUG_ON(!(NFDK_DESC_TX_DMA_LEN_HEAD & 1)); @@ -339,7 +339,7 @@ netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev) dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); txd->dma_len_type = cpu_to_le16(dlen_type); - nfp_desc_set_dma_addr(txd, dma_addr); + nfp_nfdk_tx_desc_set_dma_addr(txd, dma_addr); dma_len -= dlen_type; dma_addr += dlen_type + 1; @@ -929,7 +929,7 @@ nfp_nfdk_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring, FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); txd->dma_len_type = cpu_to_le16(dlen_type); - nfp_desc_set_dma_addr(txd, dma_addr); + nfp_nfdk_tx_desc_set_dma_addr(txd, dma_addr); tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; dma_len -= tmp_dlen; @@ -940,7 +940,7 @@ nfp_nfdk_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring, dma_len -= 1; dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); txd->dma_len_type = cpu_to_le16(dlen_type); - nfp_desc_set_dma_addr(txd, dma_addr); + nfp_nfdk_tx_desc_set_dma_addr(txd, dma_addr); dlen_type &= NFDK_DESC_TX_DMA_LEN; dma_len -= dlen_type; @@ -1332,7 +1332,7 @@ nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type); txd->dma_len_type = cpu_to_le16(dlen_type); - nfp_desc_set_dma_addr(txd, dma_addr); + nfp_nfdk_tx_desc_set_dma_addr(txd, dma_addr); tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD; dma_len -= tmp_dlen; @@ -1343,7 +1343,7 @@ nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, dma_len -= 1; dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len); txd->dma_len_type = cpu_to_le16(dlen_type); - nfp_desc_set_dma_addr(txd, dma_addr); + nfp_nfdk_tx_desc_set_dma_addr(txd, dma_addr); dlen_type &= NFDK_DESC_TX_DMA_LEN; dma_len -= dlen_type; diff --git a/drivers/net/ethernet/netronome/nfp/nfdk/nfdk.h b/drivers/net/ethernet/netronome/nfp/nfdk/nfdk.h index c41e097..0ea51d9 100644 --- a/drivers/net/ethernet/netronome/nfp/nfdk/nfdk.h +++ b/drivers/net/ethernet/netronome/nfp/nfdk/nfdk.h @@ -46,8 +46,7 @@ struct nfp_nfdk_tx_desc { union { struct { - u8 dma_addr_hi; /* High bits of host buf address */ - u8 padding; /* Must be zero */ + __le16 dma_addr_hi; /* High bits of host buf address */ __le16 dma_len_type; /* Length to DMA for this desc */ __le32 dma_addr_lo; /* Low 32bit of host buf addr */ }; diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net.h b/drivers/net/ethernet/netronome/nfp/nfp_net.h index 428783b..3dd3a92 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_net.h +++ b/drivers/net/ethernet/netronome/nfp/nfp_net.h @@ -117,13 +117,22 @@ struct nfp_nfdk_tx_buf; /* Convenience macro for writing dma address into RX/TX descriptors */ #define nfp_desc_set_dma_addr(desc, dma_addr) \ do { \ - __typeof(desc) __d = (desc); \ + __typeof__(desc) __d = (desc); \ dma_addr_t __addr = (dma_addr); \ \ __d->dma_addr_lo = cpu_to_le32(lower_32_bits(__addr)); \ __d->dma_addr_hi = upper_32_bits(__addr) & 0xff; \ } while (0) +#define nfp_nfdk_tx_desc_set_dma_addr(desc, dma_addr) \ + do { \ + __typeof__(desc) __d = (desc); \ + dma_addr_t __addr = (dma_addr); \ + \ + __d->dma_addr_hi = cpu_to_le16(upper_32_bits(__addr) & 0xff); \ + __d->dma_addr_lo = cpu_to_le32(lower_32_bits(__addr)); \ + } while (0) + /** * struct nfp_net_tx_ring - TX ring structure * @r_vec: Back pointer to ring vector structure -- 2.7.4