libmctp: Clarify BTU-related symbols
DSP0236 defines a Baseline Transmission Unit (BTU), which dictates the
minimum supported packet payload size. The packet size is the BTU + the
packet header. The maximum (payload) transport unit size for a given
binding may be larger than the BTU.
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I2c4013531efd572d95c5a61e4d59309490505a8f
diff --git a/astlpc.c b/astlpc.c
index 7ab78d6..de3982c 100644
--- a/astlpc.c
+++ b/astlpc.c
@@ -356,7 +356,7 @@
astlpc->binding.version = 1;
astlpc->binding.tx = mctp_binding_astlpc_tx;
astlpc->binding.start = mctp_binding_astlpc_start;
- astlpc->binding.pkt_size = MCTP_BMTU;
+ astlpc->binding.pkt_size = MCTP_PACKET_SIZE(MCTP_BTU);
astlpc->binding.pkt_pad = 0;
astlpc->lpc_map = NULL;
diff --git a/libmctp.h b/libmctp.h
index b36a943..69ec46a 100644
--- a/libmctp.h
+++ b/libmctp.h
@@ -31,9 +31,9 @@
#define MCTP_HDR_TAG_SHIFT (0)
#define MCTP_HDR_TAG_MASK (0x7)
-/* Baseline maximum size of a MCTP packet */
-#define MCTP_BMTU_PAYLOAD 64
-#define MCTP_BMTU (MCTP_BMTU_PAYLOAD + sizeof(struct mctp_hdr))
+/* Baseline Transmission Unit and packet size */
+#define MCTP_BTU 64
+#define MCTP_PACKET_SIZE(unit) ((unit) + sizeof(struct mctp_hdr))
/* packet buffers */
diff --git a/serial.c b/serial.c
index 808c215..c90de54 100644
--- a/serial.c
+++ b/serial.c
@@ -347,7 +347,7 @@
serial->rx_pkt = NULL;
serial->binding.name = "serial";
serial->binding.version = 1;
- serial->binding.pkt_size = MCTP_BMTU;
+ serial->binding.pkt_size = MCTP_PACKET_SIZE(MCTP_BTU);
serial->binding.pkt_pad = 0;
serial->binding.start = mctp_serial_core_start;
diff --git a/tests/test-utils.c b/tests/test-utils.c
index dc0a5f3..df04343 100644
--- a/tests/test-utils.c
+++ b/tests/test-utils.c
@@ -27,7 +27,7 @@
test->binding.name = "test";
test->binding.version = 1;
test->binding.tx = mctp_binding_test_tx;
- test->binding.pkt_size = MCTP_BMTU;
+ test->binding.pkt_size = MCTP_PACKET_SIZE(MCTP_BTU);
test->binding.pkt_pad = 0;
return test;
}
diff --git a/tests/test_bridge.c b/tests/test_bridge.c
index 496ae19..43b5d76 100644
--- a/tests/test_bridge.c
+++ b/tests/test_bridge.c
@@ -68,7 +68,7 @@
binding->binding.name = "test";
binding->binding.version = 1;
binding->binding.tx = mctp_binding_bridge_tx;
- binding->binding.pkt_size = MCTP_BMTU;
+ binding->binding.pkt_size = MCTP_PACKET_SIZE(MCTP_BTU);
binding->binding.pkt_pad = 0;
return binding;
}