[PATCH] IB/ipath: rC receive interrupt performance changes

This patch separates QP state used for sending and receiving RC packets so the
processing in the receive interrupt handler can be done mostly without locks
being held.  ACK packets are now sent without requiring synchronization with
the send tasklet.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Cc: "Michael S. Tsirkin" <mst@mellanox.co.il>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 7 insertions, 5 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.h b/drivers/infiniband/hw/ipath/ipath_verbs.h
index 1cb797086679..2df684727dc1 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.h
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.h
@@ -307,32 +307,34 @@ struct ipath_qp {
         u32 s_next_psn;         /* PSN for next request */
         u32 s_last_psn;         /* last response PSN processed */
         u32 s_psn;              /* current packet sequence number */
+        u32 s_ack_psn;          /* PSN for RDMA_READ */
         u32 s_rnr_timeout;      /* number of milliseconds for RNR timeout */
-        u32 s_ack_psn;          /* PSN for next ACK or RDMA_READ */
-        u64 s_ack_atomic;       /* data for atomic ACK */
+        u32 r_ack_psn;          /* PSN for next ACK or atomic ACK */
         u64 r_wr_id;            /* ID for current receive WQE */
         u64 r_atomic_data;      /* data for last atomic op */
         u32 r_atomic_psn;       /* PSN of last atomic op */
         u32 r_len;              /* total length of r_sge */
         u32 r_rcv_len;          /* receive data len processed */
         u32 r_psn;              /* expected rcv packet sequence number */
+        u32 r_msn;              /* message sequence number */
         u8 state;               /* QP state */
         u8 s_state;             /* opcode of last packet sent */
         u8 s_ack_state;         /* opcode of packet to ACK */
         u8 s_nak_state;         /* non-zero if NAK is pending */
         u8 r_state;             /* opcode of last packet received */
+        u8 r_ack_state;         /* opcode of packet to ACK */
+        u8 r_nak_state;         /* non-zero if NAK is pending */
+        u8 r_min_rnr_timer;     /* retry timeout value for RNR NAKs */
         u8 r_reuse_sge;         /* for UC receive errors */
         u8 r_sge_inx;           /* current index into sg_list */
-        u8 s_max_sge;           /* size of s_wq->sg_list */
         u8 qp_access_flags;
+        u8 s_max_sge;           /* size of s_wq->sg_list */
         u8 s_retry_cnt;         /* number of times to retry */
         u8 s_rnr_retry_cnt;
-        u8 s_min_rnr_timer;
         u8 s_retry;             /* requester retry counter */
         u8 s_rnr_retry;         /* requester RNR retry counter */
         u8 s_pkey_index;        /* PKEY index to use */
         enum ib_mtu path_mtu;
-        atomic_t msn;           /* message sequence number */
         u32 remote_qpn;
         u32 qkey;               /* QKEY for this QP (for UD or RD) */
         u32 s_size;             /* send work queue size */