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Commit 7ebfc93e authored by Sebastian Sanchez's avatar Sebastian Sanchez Committed by Doug Ledford
Browse files

IB/rdmavt: Correct issues with read-mostly and send size cache lines 



The s_ahgpsn was incorrectly placed in the read-mostly section of the QP
and the s_curr_size and s_hdrwords are oversized. The misplaced
s_ahgpsn will cause the read-mostly cachelines to thrash.

Place s_ahgpsn in the send side cache lines and correctly size and
s_hdrwords and s_cur_size to keep the send side cachelines at the same
size.

Reviewed-by: default avatarMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: default avatarSebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: default avatarDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent a917374e

drivers/infiniband/hw/hfi1/chip.c

+2 −2
Original line number Diff line number Diff line
@@ -8739,7 +8739,7 @@ static int set_physical_link_state(struct hfi1_devdata *dd, u64 state) 
	return do_8051_command(dd, HCMD_CHANGE_PHY_STATE, state, NULL);

}



int _load_8051_config(struct hfi1_devdata *dd, u8 field_id,

static int _load_8051_config(struct hfi1_devdata *dd, u8 field_id,

			     u8 lane_id, u32 config_data)

{

	u64 data;

include/rdma/rdmavt_qp.h

+3 −3
Original line number Diff line number Diff line
@@ -282,7 +282,6 @@ struct rvt_qp { 
	u32 remote_qpn;

	u32 qkey;               /* QKEY for this QP (for UD or RD) */

	u32 s_size;             /* send work queue size */

	u32 s_ahgpsn;           /* set to the psn in the copy of the header */



	u16 pmtu;		/* decoded from path_mtu */

	u8 log_pmtu;		/* shift for pmtu */
@@ -344,7 +343,6 @@ struct rvt_qp { 
	struct rvt_swqe *s_wqe;

	struct rvt_sge_state s_sge;     /* current send request data */

	struct rvt_mregion *s_rdma_mr;

	u32 s_cur_size;         /* size of send packet in bytes */

	u32 s_len;              /* total length of s_sge */

	u32 s_rdma_read_len;    /* total length of s_rdma_read_sge */

	u32 s_last_psn;         /* last response PSN processed */
@@ -358,8 +356,10 @@ struct rvt_qp { 
	u32 s_acked;            /* last un-ACK'ed entry */

	u32 s_last;             /* last completed entry */

	u32 s_lsn;              /* limit sequence number (credit) */

	u16 s_hdrwords;         /* size of s_hdr in 32 bit words */

	u32 s_ahgpsn;           /* set to the psn in the copy of the header */

	u16 s_cur_size;         /* size of send packet in bytes */

	u16 s_rdma_ack_cnt;

	u8 s_hdrwords;         /* size of s_hdr in 32 bit words */

	s8 s_ahgidx;

	u8 s_state;             /* opcode of last packet sent */

	u8 s_ack_state;         /* opcode of packet to ACK */