diff options
Diffstat (limited to 'net/smc/smc.h')
| -rw-r--r-- | net/smc/smc.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/net/smc/smc.h b/net/smc/smc.h index 11265bde4655..2bf504492133 100644 --- a/net/smc/smc.h +++ b/net/smc/smc.h @@ -34,6 +34,16 @@ struct smc_connection { struct smc_link_group *lgr; /* link group of connection */ u32 alert_token_local; /* unique conn. id */ u8 peer_conn_idx; /* from tcp handshake */ + int peer_rmbe_size; /* size of peer rx buffer */ + atomic_t peer_rmbe_space;/* remaining free bytes in peer + * rmbe + */ + + struct smc_buf_desc *sndbuf_desc; /* send buffer descriptor */ + int sndbuf_size; /* sndbuf size <== sock wmem */ + struct smc_buf_desc *rmb_desc; /* RMBE descriptor */ + int rmbe_size; /* RMBE size <== sock rmem */ + int rmbe_size_short;/* compressed notation */ }; struct smc_sock { /* smc sock container */ @@ -76,6 +86,41 @@ static inline u32 ntoh24(u8 *net) return be32_to_cpu(t); } +#define SMC_BUF_MIN_SIZE 16384 /* minimum size of an RMB */ + +#define SMC_RMBE_SIZES 16 /* number of distinct sizes for an RMBE */ +/* theoretically, the RFC states that largest size would be 512K, + * i.e. compressed 5 and thus 6 sizes (0..5), despite + * struct smc_clc_msg_accept_confirm.rmbe_size being a 4 bit value (0..15) + */ + +/* convert the RMB size into the compressed notation - minimum 16K. + * In contrast to plain ilog2, this rounds towards the next power of 2, + * so the socket application gets at least its desired sndbuf / rcvbuf size. + */ +static inline u8 smc_compress_bufsize(int size) +{ + u8 compressed; + + if (size <= SMC_BUF_MIN_SIZE) + return 0; + + size = (size - 1) >> 14; + compressed = ilog2(size) + 1; + if (compressed >= SMC_RMBE_SIZES) + compressed = SMC_RMBE_SIZES - 1; + return compressed; +} + +/* convert the RMB size from compressed notation into integer */ +static inline int smc_uncompress_bufsize(u8 compressed) +{ + u32 size; + + size = 0x00000001 << (((int)compressed) + 14); + return (int)size; +} + #ifdef CONFIG_XFRM static inline bool using_ipsec(struct smc_sock *smc) { |