diff options
| -rw-r--r-- | net/rds/ib.h | 12 | ||||
| -rw-r--r-- | net/rds/ib_cm.c | 9 | ||||
| -rw-r--r-- | net/rds/ib_recv.c | 43 |
3 files changed, 58 insertions, 6 deletions
diff --git a/net/rds/ib.h b/net/rds/ib.h index 420afb95ca1a..c0de7af6cf60 100644 --- a/net/rds/ib.h +++ b/net/rds/ib.h @@ -358,17 +358,25 @@ extern ctl_table rds_ib_sysctl_table[]; /* * Helper functions for getting/setting the header and data SGEs in * RDS packets (not RDMA) + * + * From version 3.1 onwards, header is in front of data in the sge. */ static inline struct ib_sge * rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge) { - return &sge[0]; + if (ic->conn->c_version > RDS_PROTOCOL_3_0) + return &sge[0]; + else + return &sge[1]; } static inline struct ib_sge * rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge) { - return &sge[1]; + if (ic->conn->c_version > RDS_PROTOCOL_3_0) + return &sge[1]; + else + return &sge[0]; } #endif diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c index 0964ac533ec8..1eb0c291a0b4 100644 --- a/net/rds/ib_cm.c +++ b/net/rds/ib_cm.c @@ -101,10 +101,13 @@ void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_even if (event->param.conn.private_data_len >= sizeof(*dp)) { dp = event->param.conn.private_data; - rds_ib_set_protocol(conn, + /* make sure it isn't empty data */ + if (dp->dp_protocol_major) { + rds_ib_set_protocol(conn, RDS_PROTOCOL(dp->dp_protocol_major, - dp->dp_protocol_minor)); - rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); + dp->dp_protocol_minor)); + rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); + } } printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n", diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c index 5709bad28329..28bdcdcdbfe9 100644 --- a/net/rds/ib_recv.c +++ b/net/rds/ib_recv.c @@ -555,6 +555,47 @@ u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic) return rds_ib_get_ack(ic); } +static struct rds_header *rds_ib_get_header(struct rds_connection *conn, + struct rds_ib_recv_work *recv, + u32 data_len) +{ + struct rds_ib_connection *ic = conn->c_transport_data; + void *hdr_buff = &ic->i_recv_hdrs[recv - ic->i_recvs]; + void *addr; + u32 misplaced_hdr_bytes; + + /* + * Support header at the front (RDS 3.1+) as well as header-at-end. + * + * Cases: + * 1) header all in header buff (great!) + * 2) header all in data page (copy all to header buff) + * 3) header split across hdr buf + data page + * (move bit in hdr buff to end before copying other bit from data page) + */ + if (conn->c_version > RDS_PROTOCOL_3_0 || data_len == RDS_FRAG_SIZE) + return hdr_buff; + + if (data_len <= (RDS_FRAG_SIZE - sizeof(struct rds_header))) { + addr = kmap_atomic(recv->r_frag->f_page, KM_SOFTIRQ0); + memcpy(hdr_buff, + addr + recv->r_frag->f_offset + data_len, + sizeof(struct rds_header)); + kunmap_atomic(addr, KM_SOFTIRQ0); + return hdr_buff; + } + + misplaced_hdr_bytes = (sizeof(struct rds_header) - (RDS_FRAG_SIZE - data_len)); + + memmove(hdr_buff + misplaced_hdr_bytes, hdr_buff, misplaced_hdr_bytes); + + addr = kmap_atomic(recv->r_frag->f_page, KM_SOFTIRQ0); + memcpy(hdr_buff, addr + recv->r_frag->f_offset + data_len, + sizeof(struct rds_header) - misplaced_hdr_bytes); + kunmap_atomic(addr, KM_SOFTIRQ0); + return hdr_buff; +} + /* * It's kind of lame that we're copying from the posted receive pages into * long-lived bitmaps. We could have posted the bitmaps and rdma written into @@ -667,7 +708,7 @@ static void rds_ib_process_recv(struct rds_connection *conn, } byte_len -= sizeof(struct rds_header); - ihdr = &ic->i_recv_hdrs[recv - ic->i_recvs]; + ihdr = rds_ib_get_header(conn, recv, byte_len); /* Validate the checksum. */ if (!rds_message_verify_checksum(ihdr)) { |