diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/701-net-0075-sdk_dpaa-reserve-256-bytes-for-the-SGT-on-TX.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/701-net-0075-sdk_dpaa-reserve-256-bytes-for-the-SGT-on-TX.patch | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/701-net-0075-sdk_dpaa-reserve-256-bytes-for-the-SGT-on-TX.patch b/target/linux/layerscape/patches-5.4/701-net-0075-sdk_dpaa-reserve-256-bytes-for-the-SGT-on-TX.patch new file mode 100644 index 0000000000..2056276472 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/701-net-0075-sdk_dpaa-reserve-256-bytes-for-the-SGT-on-TX.patch @@ -0,0 +1,57 @@ +From 29757ae2e4a0e8e1e816c9eeef59121908320669 Mon Sep 17 00:00:00 2001 +From: Camelia Groza <camelia.groza@nxp.com> +Date: Wed, 20 Jun 2018 18:00:42 +0300 +Subject: [PATCH] sdk_dpaa: reserve 256 bytes for the SGT on TX + +The FMan reads 256 bytes from the start of the SGT regardless of its +size. We reserve the same amount of memory on TX to access. + +Signed-off-by: Camelia Groza <camelia.groza@nxp.com> +--- + drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.h | 6 ++++-- + drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c | 10 +++++++--- + 2 files changed, 11 insertions(+), 5 deletions(-) + +--- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.h ++++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_common.h +@@ -55,10 +55,12 @@ + fm_set_##type##_port_params(port, ¶m); \ + } + ++/* The SGT needs to be 256 bytes long. Even if the table has only one entry, ++ * the FMan will read 256 bytes from its start. ++ */ ++#define DPA_SGT_SIZE 256 + #define DPA_SGT_MAX_ENTRIES 16 /* maximum number of entries in SG Table */ + +-#define DPA_SGT_ENTRIES_THRESHOLD DPA_SGT_MAX_ENTRIES +- + #define DPA_BUFF_RELEASE_MAX 8 /* maximum number of buffers released at once */ + + #define DPA_RX_PCD_HI_PRIO_FQ_INIT_FAIL(dpa_fq, _errno) \ +--- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c ++++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c +@@ -246,8 +246,8 @@ struct sk_buff *_dpa_cleanup_tx_fd(const + + if (unlikely(fd->format == qm_fd_sg)) { + nr_frags = skb_shinfo(skb)->nr_frags; +- dma_unmap_single(dpa_bp->dev, addr, dpa_fd_offset(fd) + +- sizeof(struct qm_sg_entry) * (1 + nr_frags), ++ dma_unmap_single(dpa_bp->dev, addr, ++ dpa_fd_offset(fd) + DPA_SGT_SIZE, + dma_dir); + + /* The sgt buffer has been allocated with netdev_alloc_frag(), +@@ -896,7 +896,11 @@ int __hot skb_to_sg_fd(struct dpa_priv_s + nr_frags = skb_shinfo(skb)->nr_frags; + fd->format = qm_fd_sg; + +- sgt_size = sizeof(struct qm_sg_entry) * (1 + nr_frags); ++ /* The FMan reads 256 bytes from the start of the SGT regardless of ++ * its size. In accordance, we reserve the same amount of memory as ++ * well. ++ */ ++ sgt_size = DPA_SGT_SIZE; + + /* Get a page frag to store the SGTable, or a full page if the errata + * is in place and we need to avoid crossing a 4k boundary. |