MC 0.7.1.2 enforces limitation i.e.: "Packets may be corrupted in several combinations of buffer size and frame offsets. Workaround: Use buffers that are of size that is a multiple of 256, and frame offset that is a multiple of 256"
Updating the DPNI Eth driver to comply with the restriction.
Signed-off-by: Bogdan Hamciuc bogdan.hamciuc@freescale.com Signed-off-by: Prabhakar Kushwaha prabhakar@freescale.com --- Changes for v2: Updated description
drivers/net/ldpaa_eth/ldpaa_eth.c | 11 ++++++++--- drivers/net/ldpaa_eth/ldpaa_eth.h | 6 +++--- 2 files changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ldpaa_eth/ldpaa_eth.c b/drivers/net/ldpaa_eth/ldpaa_eth.c index 5ddc9fe..69530b1 100644 --- a/drivers/net/ldpaa_eth/ldpaa_eth.c +++ b/drivers/net/ldpaa_eth/ldpaa_eth.c @@ -500,7 +500,7 @@ static int ldpaa_bp_add_7(uint16_t bpid) struct qbman_release_desc rd;
for (i = 0; i < 7; i++) { - addr = memalign(L1_CACHE_BYTES, LDPAA_ETH_RX_BUFFER_SIZE); + addr = memalign(LDPAA_ETH_BUF_ALIGN, LDPAA_ETH_RX_BUFFER_SIZE); if (!addr) { printf("addr allocation failed\n"); goto err_alloc; @@ -685,10 +685,13 @@ static int ldpaa_dpni_setup(struct ldpaa_eth_priv *priv) /* Configure our buffers' layout */ dflt_dpni->buf_layout.options = DPNI_BUF_LAYOUT_OPT_PARSER_RESULT | DPNI_BUF_LAYOUT_OPT_FRAME_STATUS | - DPNI_BUF_LAYOUT_OPT_PRIVATE_DATA_SIZE; + DPNI_BUF_LAYOUT_OPT_PRIVATE_DATA_SIZE | + DPNI_BUF_LAYOUT_OPT_DATA_ALIGN; dflt_dpni->buf_layout.pass_parser_result = true; dflt_dpni->buf_layout.pass_frame_status = true; dflt_dpni->buf_layout.private_data_size = LDPAA_ETH_SWA_SIZE; + /* HW erratum mandates data alignment in multiples of 256 */ + dflt_dpni->buf_layout.data_align = LDPAA_ETH_BUF_ALIGN; /* ...rx, ... */ err = dpni_set_rx_buffer_layout(dflt_mc_io, MC_CMD_NO_FLAGS, dflt_dpni->dpni_handle, @@ -699,7 +702,9 @@ static int ldpaa_dpni_setup(struct ldpaa_eth_priv *priv) }
/* ... tx, ... */ - dflt_dpni->buf_layout.options &= ~DPNI_BUF_LAYOUT_OPT_PARSER_RESULT; + /* remove Rx-only options */ + dflt_dpni->buf_layout.options &= ~(DPNI_BUF_LAYOUT_OPT_DATA_ALIGN | + DPNI_BUF_LAYOUT_OPT_PARSER_RESULT); err = dpni_set_tx_buffer_layout(dflt_mc_io, MC_CMD_NO_FLAGS, dflt_dpni->dpni_handle, &dflt_dpni->buf_layout); diff --git a/drivers/net/ldpaa_eth/ldpaa_eth.h b/drivers/net/ldpaa_eth/ldpaa_eth.h index b86a695..af41b27 100644 --- a/drivers/net/ldpaa_eth/ldpaa_eth.h +++ b/drivers/net/ldpaa_eth/ldpaa_eth.h @@ -28,10 +28,10 @@ enum ldpaa_eth_type { #define LDPAA_ETH_REFILL_THRESH (LDPAA_ETH_NUM_BUFS/2) #define LDPAA_ETH_RX_BUFFER_SIZE 2048
-/* Hardware requires alignment for ingress/egress buffer addresses - * and ingress buffer lengths. +/* Hardware requires alignment for buffer address and length: 256-byte + * for ingress, 64-byte for egress. Using 256 for both. */ -#define LDPAA_ETH_BUF_ALIGN 64 +#define LDPAA_ETH_BUF_ALIGN 256
/* So far we're only accomodating a skb backpointer in the frame's * software annotation, but the hardware options are either 0 or 64.