[ewg] [PATCHv6 07/10] ib_core: RDMAoE UD packet packing support
Eli Cohen
eli at mellanox.co.il
Mon Nov 16 07:53:54 PST 2009
Add support functions to aid in packing RDMAoE packets.
Signed-off-by: Eli Cohen <eli at mellanox.co.il>
---
drivers/infiniband/core/ud_header.c | 111 +++++++++++++++++++++++++++++++++++
include/rdma/ib_pack.h | 26 ++++++++
2 files changed, 137 insertions(+), 0 deletions(-)
diff --git a/drivers/infiniband/core/ud_header.c b/drivers/infiniband/core/ud_header.c
index 8ec7876..d04b6f2 100644
--- a/drivers/infiniband/core/ud_header.c
+++ b/drivers/infiniband/core/ud_header.c
@@ -80,6 +80,29 @@ static const struct ib_field lrh_table[] = {
.size_bits = 16 }
};
+static const struct ib_field eth_table[] = {
+ { STRUCT_FIELD(eth, dmac_h),
+ .offset_words = 0,
+ .offset_bits = 0,
+ .size_bits = 32 },
+ { STRUCT_FIELD(eth, dmac_l),
+ .offset_words = 1,
+ .offset_bits = 0,
+ .size_bits = 16 },
+ { STRUCT_FIELD(eth, smac_h),
+ .offset_words = 1,
+ .offset_bits = 16,
+ .size_bits = 16 },
+ { STRUCT_FIELD(eth, smac_l),
+ .offset_words = 2,
+ .offset_bits = 0,
+ .size_bits = 32 },
+ { STRUCT_FIELD(eth, type),
+ .offset_words = 3,
+ .offset_bits = 0,
+ .size_bits = 16 }
+};
+
static const struct ib_field grh_table[] = {
{ STRUCT_FIELD(grh, ip_version),
.offset_words = 0,
@@ -241,6 +264,53 @@ void ib_ud_header_init(int payload_bytes,
EXPORT_SYMBOL(ib_ud_header_init);
/**
+ * ib_rdmaoe_ud_header_init - Initialize UD header structure
+ * @payload_bytes:Length of packet payload
+ * @grh_present:GRH flag (if non-zero, GRH will be included)
+ * @header:Structure to initialize
+ *
+ * ib_rdmaoe_ud_header_init() initializes the grh.ip_version, grh.payload_length,
+ * grh.next_header, bth.opcode, bth.pad_count and
+ * bth.transport_header_version fields of a &struct eth_ud_header given
+ * the payload length and whether a GRH will be included.
+ */
+void ib_rdmaoe_ud_header_init(int payload_bytes,
+ int grh_present,
+ struct eth_ud_header *header)
+{
+ int header_len;
+
+ memset(header, 0, sizeof *header);
+
+ header_len =
+ sizeof header->eth +
+ IB_BTH_BYTES +
+ IB_DETH_BYTES;
+ if (grh_present)
+ header_len += IB_GRH_BYTES;
+
+ header->grh_present = grh_present;
+ if (grh_present) {
+ header->grh.ip_version = 6;
+ header->grh.payload_length =
+ cpu_to_be16((IB_BTH_BYTES +
+ IB_DETH_BYTES +
+ payload_bytes +
+ 4 + /* ICRC */
+ 3) & ~3); /* round up */
+ header->grh.next_header = 0x1b;
+ }
+
+ if (header->immediate_present)
+ header->bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
+ else
+ header->bth.opcode = IB_OPCODE_UD_SEND_ONLY;
+ header->bth.pad_count = (4 - payload_bytes) & 3;
+ header->bth.transport_header_version = 0;
+}
+EXPORT_SYMBOL(ib_rdmaoe_ud_header_init);
+
+/**
* ib_ud_header_pack - Pack UD header struct into wire format
* @header:UD header struct
* @buf:Buffer to pack into
@@ -281,6 +351,47 @@ int ib_ud_header_pack(struct ib_ud_header *header,
EXPORT_SYMBOL(ib_ud_header_pack);
/**
+ * rdmaoe_ud_header_pack - Pack UD header struct into eth wire format
+ * @header:UD header struct
+ * @buf:Buffer to pack into
+ *
+ * ib_ud_header_pack() packs the UD header structure @header into wire
+ * format in the buffer @buf.
+ */
+int rdmaoe_ud_header_pack(struct eth_ud_header *header,
+ void *buf)
+{
+ int len = 0;
+
+ ib_pack(eth_table, ARRAY_SIZE(eth_table),
+ &header->eth, buf);
+ len += IB_ETH_BYTES;
+
+ if (header->grh_present) {
+ ib_pack(grh_table, ARRAY_SIZE(grh_table),
+ &header->grh, buf + len);
+ len += IB_GRH_BYTES;
+ }
+
+ ib_pack(bth_table, ARRAY_SIZE(bth_table),
+ &header->bth, buf + len);
+ len += IB_BTH_BYTES;
+
+ ib_pack(deth_table, ARRAY_SIZE(deth_table),
+ &header->deth, buf + len);
+ len += IB_DETH_BYTES;
+
+ if (header->immediate_present) {
+ memcpy(buf + len, &header->immediate_data,
+ sizeof header->immediate_data);
+ len += sizeof header->immediate_data;
+ }
+
+ return len;
+}
+EXPORT_SYMBOL(rdmaoe_ud_header_pack);
+
+/**
* ib_ud_header_unpack - Unpack UD header struct from wire format
* @header:UD header struct
* @buf:Buffer to pack into
diff --git a/include/rdma/ib_pack.h b/include/rdma/ib_pack.h
index d7fc45c..bf199eb 100644
--- a/include/rdma/ib_pack.h
+++ b/include/rdma/ib_pack.h
@@ -37,6 +37,7 @@
enum {
IB_LRH_BYTES = 8,
+ IB_ETH_BYTES = 14,
IB_GRH_BYTES = 40,
IB_BTH_BYTES = 12,
IB_DETH_BYTES = 8
@@ -210,6 +211,14 @@ struct ib_unpacked_deth {
__be32 source_qpn;
};
+struct ib_unpacked_eth {
+ u8 dmac_h[4];
+ u8 dmac_l[2];
+ u8 smac_h[2];
+ u8 smac_l[4];
+ __be16 type;
+};
+
struct ib_ud_header {
struct ib_unpacked_lrh lrh;
int grh_present;
@@ -220,6 +229,16 @@ struct ib_ud_header {
__be32 immediate_data;
};
+struct eth_ud_header {
+ struct ib_unpacked_eth eth;
+ int grh_present;
+ struct ib_unpacked_grh grh;
+ struct ib_unpacked_bth bth;
+ struct ib_unpacked_deth deth;
+ int immediate_present;
+ __be32 immediate_data;
+};
+
void ib_pack(const struct ib_field *desc,
int desc_len,
void *structure,
@@ -234,10 +253,17 @@ void ib_ud_header_init(int payload_bytes,
int grh_present,
struct ib_ud_header *header);
+void ib_rdmaoe_ud_header_init(int payload_bytes,
+ int grh_present,
+ struct eth_ud_header *header);
+
int ib_ud_header_pack(struct ib_ud_header *header,
void *buf);
int ib_ud_header_unpack(void *buf,
struct ib_ud_header *header);
+int rdmaoe_ud_header_pack(struct eth_ud_header *header,
+ void *buf);
+
#endif /* IB_PACK_H */
--
1.6.5.2
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