staging/rdma/hfi1: add ACK coalescing logic
Implement ACK coalesing logic using a 8 bit counter. The algorithm is send pio ack when: - fecn present - this is the first packet in an interrupt session - counter is >= HFI1_PSN_CREDIT Otherwise the ack is defered. Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -378,6 +378,7 @@ static void reset_qp(struct hfi1_qp *qp, enum ib_qp_type type)
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}
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qp->s_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
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qp->r_nak_state = 0;
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qp->r_adefered = 0;
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qp->r_aflags = 0;
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qp->r_flags = 0;
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qp->s_head = 0;
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@ -1618,6 +1618,17 @@ static inline void rc_defered_ack(struct hfi1_ctxtdata *rcd,
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}
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}
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static inline void rc_cancel_ack(struct hfi1_qp *qp)
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{
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qp->r_adefered = 0;
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if (list_empty(&qp->rspwait))
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return;
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list_del_init(&qp->rspwait);
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qp->r_flags &= ~HFI1_R_RSP_DEFERED_ACK;
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if (atomic_dec_and_test(&qp->refcount))
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wake_up(&qp->wait);
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}
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/**
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* rc_rcv_error - process an incoming duplicate or error RC packet
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* @ohdr: the other headers for this packet
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@ -2335,8 +2346,22 @@ send_last:
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qp->r_ack_psn = psn;
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qp->r_nak_state = 0;
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/* Send an ACK if requested or required. */
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if (psn & (1 << 31))
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if (psn & IB_BTH_REQ_ACK) {
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if (packet->numpkt == 0) {
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rc_cancel_ack(qp);
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goto send_ack;
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}
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if (qp->r_adefered >= HFI1_PSN_CREDIT) {
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rc_cancel_ack(qp);
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goto send_ack;
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}
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if (unlikely(is_fecn)) {
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rc_cancel_ack(qp);
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goto send_ack;
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}
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qp->r_adefered++;
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rc_defered_ack(rcd, qp);
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}
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return;
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rnr_nak:
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@ -120,9 +120,9 @@ struct hfi1_packet;
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#define HFI1_VENDOR_IPG cpu_to_be16(0xFFA0)
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#define IB_BTH_REQ_ACK (1 << 31)
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#define IB_BTH_SOLICITED (1 << 23)
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#define IB_BTH_MIG_REQ (1 << 22)
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#define IB_BTH_REQ_ACK BIT(31)
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#define IB_BTH_SOLICITED BIT(23)
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#define IB_BTH_MIG_REQ BIT(22)
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#define IB_GRH_VERSION 6
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#define IB_GRH_VERSION_MASK 0xF
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@ -490,6 +490,7 @@ struct hfi1_qp {
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u32 r_psn; /* expected rcv packet sequence number */
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u32 r_msn; /* message sequence number */
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u8 r_adefered; /* number of acks defered */
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u8 r_state; /* opcode of last packet received */
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u8 r_flags;
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u8 r_head_ack_queue; /* index into s_ack_queue[] */
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