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| author | Shamir Rabinovitch <shamir.rabinovitch@oracle.com> | 2026-02-02 22:57:16 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-02-04 20:46:38 -0800 |
| commit | 46f257ee6904125e6336d63f0694ff4c491cfbf7 (patch) | |
| tree | efde49d5e22f279c988dbeba3bd7c6770a168fe6 /net/rds/rds.h | |
| parent | acd21dd2da198875e0cf73f08b18c9bbf8b87d8c (diff) | |
| download | linux-next-46f257ee6904125e6336d63f0694ff4c491cfbf7.tar.gz linux-next-46f257ee6904125e6336d63f0694ff4c491cfbf7.zip | |
net/rds: new extension header: rdma bytes
Introduce a new extension header type RDSV3_EXTHDR_RDMA_BYTES for
an RDMA initiator to exchange rdma byte counts to its target.
Currently, RDMA operations cannot precisely account how many bytes a
peer just transferred via RDMA, which limits per-connection statistics
and future policy (e.g., monitoring or rate/cgroup accounting of RDMA
traffic).
In this patch we expand rds_message_add_extension to accept multiple
extensions, and add new flag to RDS header: RDS_FLAG_EXTHDR_EXTENSION,
along with a new extension to RDS header: rds_ext_header_rdma_bytes.
Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>
Signed-off-by: Guangyu Sun <guangyu.sun@oracle.com>
Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Link: https://patch.msgid.link/20260203055723.1085751-2-achender@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/rds/rds.h')
| -rw-r--r-- | net/rds/rds.h | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/net/rds/rds.h b/net/rds/rds.h index 8a549fe687ac..4b6bf523b412 100644 --- a/net/rds/rds.h +++ b/net/rds/rds.h @@ -183,10 +183,11 @@ void rds_conn_net_set(struct rds_connection *conn, struct net *net) write_pnet(&conn->c_net, net); } -#define RDS_FLAG_CONG_BITMAP 0x01 -#define RDS_FLAG_ACK_REQUIRED 0x02 -#define RDS_FLAG_RETRANSMITTED 0x04 -#define RDS_MAX_ADV_CREDIT 255 +#define RDS_FLAG_CONG_BITMAP 0x01 +#define RDS_FLAG_ACK_REQUIRED 0x02 +#define RDS_FLAG_RETRANSMITTED 0x04 +#define RDS_FLAG_EXTHDR_EXTENSION 0x20 +#define RDS_MAX_ADV_CREDIT 255 /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping * probe to exchange control information before establishing a connection. @@ -258,6 +259,20 @@ struct rds_ext_header_rdma_dest { __be32 h_rdma_offset; }; +/* + * This extension header tells the peer about delivered RDMA byte count. + */ +#define RDS_EXTHDR_RDMA_BYTES 4 + +struct rds_ext_header_rdma_bytes { + __be32 h_rdma_bytes; /* byte count */ + u8 h_rflags; /* direction of RDMA, write or read */ + u8 h_pad[3]; +}; + +#define RDS_FLAG_RDMA_WR_BYTES 0x01 +#define RDS_FLAG_RDMA_RD_BYTES 0x02 + /* Extension header announcing number of paths. * Implicit length = 2 bytes. */ @@ -871,7 +886,7 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in void rds_message_populate_header(struct rds_header *hdr, __be16 sport, __be16 dport, u64 seq); int rds_message_add_extension(struct rds_header *hdr, - unsigned int type, const void *data, unsigned int len); + unsigned int type, const void *data); int rds_message_next_extension(struct rds_header *hdr, unsigned int *pos, void *buf, unsigned int *buflen); int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); |