drivers: ethernet: adin2111: fix real rx frame size

Fix issue related to "generic SPI" mode only, when a packet of 1512 bytes is received, net_pkt_write() fails and thrwos the error: "Still some length to go 2". This is due to net_pkt_rx_alloc_with_buffer() allocating a maximum mtu/size of 1514, and driver is not removing 4 bytes of crc32 from rx buffer, that comes to be 1516 (2 bytes over buffer limit). Fix generic SPI rx frame size removing crc32 bytes. Signed-off-by: Angelo Dureghello <[email protected]>
zephyrproject-rtos · Mar 8, 2024 · 06df4b5 · 06df4b5
1 parent 0ca8b07
commit 06df4b5
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/drivers/ethernet/eth_adin2111.c b/drivers/ethernet/eth_adin2111.c
@@ -496,8 +496,8 @@ static int adin2111_read_fifo(const struct device *dev, const uint8_t port)
 
 	/* burst read must be in multiples of 4 */
 	padding_len = ((fsize % 4) == 0) ? 0U : (ROUND_UP(fsize, 4U) - fsize);
-	/* actual frame length is FSIZE - FRAME HEADER */
-	fsize_real = fsize - ADIN2111_FRAME_HEADER_SIZE;
+	/* actual frame length is FSIZE - FRAME HEADER - CRC32 */
+	fsize_real = fsize - (ADIN2111_FRAME_HEADER_SIZE + sizeof(uint32_t));
 
 	/* spi header */
 	*(uint16_t *)cmd_buf = htons((ADIN2111_READ_TXN_CTRL | rx_reg));