Whitebox
/
u-boot
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

driver: net: ldpaa: Fix Rx buffer alignment

Browse Source 
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>
Reviewed-by: York Sun <yorksun@freescale.com>
master
Prabhakar Kushwaha 9 years ago committed by York Sun
parent 5038d3e5f2
commit 14480454c7
2 changed files with 11 additions and 6 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 11
      drivers/net/ldpaa_eth/ldpaa_eth.c
  2. 6
      drivers/net/ldpaa_eth/ldpaa_eth.h

11
drivers/net/ldpaa_eth/ldpaa_eth.c
Unescape View File

@ -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);

6
drivers/net/ldpaa_eth/ldpaa_eth.h
Unescape View File

@ -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.

Write Preview
Loading…
Cancel
Save