cxgbei: Adjust the calculation for the maximum ISO payload.
Round down the maximim ISO payload by the current MSS. Otherwise the round up by MSS when calculating the 16-bit maximum payload len passed along in the FLOWC work request can overflow. Discussed with: np Sponsored by: Chelsio Communications
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@ -1103,7 +1103,7 @@ icl_cxgbei_conn_handoff(struct icl_conn *ic, int fd)
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struct tcpcb *tp;
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struct toepcb *toep;
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cap_rights_t rights;
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u_int max_rx_pdu_len, max_tx_pdu_len;
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u_int max_iso_payload, max_rx_pdu_len, max_tx_pdu_len;
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int error, max_iso_pdus;
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MPASS(icc->icc_signature == CXGBEI_CONN_SIGNATURE);
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@ -1195,7 +1195,9 @@ icl_cxgbei_conn_handoff(struct icl_conn *ic, int fd)
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if (icc->sc->tt.iso && chip_id(icc->sc) >= CHELSIO_T5 &&
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!is_memfree(icc->sc)) {
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max_iso_pdus = CXGBEI_MAX_ISO_PAYLOAD / max_tx_pdu_len;
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max_iso_payload = rounddown(CXGBEI_MAX_ISO_PAYLOAD,
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tp->t_maxseg);
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max_iso_pdus = max_iso_payload / max_tx_pdu_len;
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ic->ic_hw_isomax = max_iso_pdus *
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ic->ic_max_send_data_segment_length;
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} else
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