RDMA/bnxt_re: Support 2G message size

RDMA/bnxt_re: Support 2G message size

bnxt_qplib_put_sges is calculating the length in
a signed int. So handling the 2G message size
is not working since it is considered as negative.

Use a unsigned number to calculate the total message
length. As per the spec, IB message size shall be
between zero and 2^31 bytes (inclusive). So adding
a check for 2G message size.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Shravya KN <shravya.k-n@broadcom.com>
Link: https://patch.msgid.link/20250704043857.19158-3-kalesh-anakkur.purayil@broadcom.com
Reviewed-by: Saravanan Vajravel <saravanan.vajravel@broadcom.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>