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net/smc: add SMC-D support in data transfer

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The data transfer and CDC message headers differ in SMC-R and SMC-D.
This patch adds support for the SMC-D data transfer to the existing SMC
code. It consists of the following:

* SMC-D CDC support
* SMC-D tx support
* SMC-D rx support

The CDC header is stored at the beginning of the receive buffer. Thus, a
rx_offset variable is added for the CDC header offset within the buffer
(0 for SMC-R).

Signed-off-by: Hans Wippel <hwippel@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Suggested-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hans Wippel
2018-06-28 19:05:10 +02:00
committed by David S. Miller
parent c758dfddc1
commit be244f28d2
8 changed files with 308 additions and 56 deletions
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43
net/smc/smc_cdc.h
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@@ -50,6 +50,20 @@ struct smc_cdc_msg {
u8 reserved[18];
} __packed; /* format defined in RFC7609 */
/* CDC message for SMC-D */
struct smcd_cdc_msg {
struct smc_wr_rx_hdr common; /* Type = 0xFE */
u8 res1[7];
u16 prod_wrap;
u32 prod_count;
u8 res2[2];
u16 cons_wrap;
u32 cons_count;
struct smc_cdc_producer_flags prod_flags;
struct smc_cdc_conn_state_flags conn_state_flags;
u8 res3[8];
} __packed;
static inline bool smc_cdc_rxed_any_close(struct smc_connection *conn)
{
return conn->local_rx_ctrl.conn_state_flags.peer_conn_abort ||
@@ -204,9 +218,9 @@ static inline void smc_cdc_cursor_to_host(union smc_host_cursor *local,
smc_curs_write(local, smc_curs_read(&temp, conn), conn);
}
static inline void smc_cdc_msg_to_host(struct smc_host_cdc_msg *local,
struct smc_cdc_msg *peer,
struct smc_connection *conn)
static inline void smcr_cdc_msg_to_host(struct smc_host_cdc_msg *local,
struct smc_cdc_msg *peer,
struct smc_connection *conn)
{
local->common.type = peer->common.type;
local->len = peer->len;
@@ -218,6 +232,27 @@ static inline void smc_cdc_msg_to_host(struct smc_host_cdc_msg *local,
local->conn_state_flags = peer->conn_state_flags;
}
static inline void smcd_cdc_msg_to_host(struct smc_host_cdc_msg *local,
struct smcd_cdc_msg *peer)
{
local->prod.wrap = peer->prod_wrap;
local->prod.count = peer->prod_count;
local->cons.wrap = peer->cons_wrap;
local->cons.count = peer->cons_count;
local->prod_flags = peer->prod_flags;
local->conn_state_flags = peer->conn_state_flags;
}
static inline void smc_cdc_msg_to_host(struct smc_host_cdc_msg *local,
struct smc_cdc_msg *peer,
struct smc_connection *conn)
{
if (conn->lgr->is_smcd)
smcd_cdc_msg_to_host(local, (struct smcd_cdc_msg *)peer);
else
smcr_cdc_msg_to_host(local, peer, conn);
}
struct smc_cdc_tx_pend;
int smc_cdc_get_free_slot(struct smc_connection *conn,
@@ -227,6 +262,8 @@ void smc_cdc_tx_dismiss_slots(struct smc_connection *conn);
int smc_cdc_msg_send(struct smc_connection *conn, struct smc_wr_buf *wr_buf,
struct smc_cdc_tx_pend *pend);
int smc_cdc_get_slot_and_msg_send(struct smc_connection *conn);
int smcd_cdc_msg_send(struct smc_connection *conn);
int smc_cdc_init(void) __init;
void smcd_cdc_rx_init(struct smc_connection *conn);
#endif /* SMC_CDC_H */