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cxgbei: Adjust the calculation for the maximum ISO payload.

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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

(cherry picked from commit 8020c05683)
This commit is contained in:
John Baldwin 2022-05-26 13:38:20 -07:00
parent 84fc080266
commit cb85a1815f
1 changed files with 4 additions and 2 deletions
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6
sys/dev/cxgbe/cxgbei/icl_cxgbei.c
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@ -1103,7 +1103,7 @@ icl_cxgbei_conn_handoff(struct icl_conn *ic, int fd)
struct tcpcb *tp;
struct toepcb *toep;
cap_rights_t rights;
u_int max_rx_pdu_len, max_tx_pdu_len;
u_int max_iso_payload, max_rx_pdu_len, max_tx_pdu_len;
int error, max_iso_pdus;
MPASS(icc->icc_signature == CXGBEI_CONN_SIGNATURE);
@ -1195,7 +1195,9 @@ icl_cxgbei_conn_handoff(struct icl_conn *ic, int fd)
if (icc->sc->tt.iso && chip_id(icc->sc) >= CHELSIO_T5 &&
!is_memfree(icc->sc)) {
max_iso_pdus = CXGBEI_MAX_ISO_PAYLOAD / max_tx_pdu_len;
max_iso_payload = rounddown(CXGBEI_MAX_ISO_PAYLOAD,
tp->t_maxseg);
max_iso_pdus = max_iso_payload / max_tx_pdu_len;
ic->ic_hw_isomax = max_iso_pdus *
ic->ic_max_send_data_segment_length;
} else