cxgbe/cxgbei: Provide a knob to set the DDP threshold for iSCSI
transfers. The Initiator and Target both perform zero copy receive for transfers greater than or equal to this threshold. Sponsored by: Chelsio Communications
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=305263
@ -192,9 +192,7 @@ cxgbei_init(struct adapter *sc, struct cxgbei_data *ci)
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read_pdu_limits(sc, &ci->max_tx_pdu_len, &ci->max_rx_pdu_len);
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ci->ddp_threshold = 2048;
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pr = &ci->pr;
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r = t4_read_reg(sc, A_ULP_RX_ISCSI_PSZ);
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rc = t4_init_ppod_region(pr, &sc->vres.iscsi, r, "iSCSI page pods");
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if (rc != 0) {
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@ -249,6 +247,10 @@ cxgbei_init(struct adapter *sc, struct cxgbei_data *ci)
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CTLFLAG_RD, &ci->fl_pdus,
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"# of PDUs with data delivered in freelist");
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ci->ddp_threshold = 2048;
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SYSCTL_ADD_UINT(&ci->ctx, children, OID_AUTO, "ddp_threshold",
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CTLFLAG_RW, &ci->ddp_threshold, 0, "Rx zero copy threshold");
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return (0);
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}
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