Author: ken
Date: Thu Aug 15 16:41:27 2013
New Revision: 254372
URL: http://svnweb.freebsd.org/changeset/base/254372
Log:
Export the maxio field in the CAM XPT_PATH_INQ CCB in the isp(4)
driver.
This tells consumers up the stack the maximum I/O size that the
controller can handle.
The I/O size is bounded by the number of scatter/gather segments
the controller can handle and the page size. For an amd64 system,
it works out to around 5MB.
Reviewed by: mjacob
MFC after: 3 days
Sponsored by: Spectra Logic
Modified:
head/sys/dev/isp/isp_freebsd.c
Modified: head/sys/dev/isp/isp_freebsd.c
==============================================================================
--- head/sys/dev/isp/isp_freebsd.c Thu Aug 15 16:03:09 2013
(r254371)
+++ head/sys/dev/isp/isp_freebsd.c Thu Aug 15 16:41:27 2013
(r254372)
@@ -5445,6 +5445,11 @@ isp_action(struct cam_sim *sim, union cc
cpi->max_target = ISP_MAX_TARGETS(isp) - 1;
cpi->max_lun = ISP_MAX_LUNS(isp) - 1;
cpi->bus_id = cam_sim_bus(sim);
+ if (isp->isp_osinfo.sixtyfourbit)
+ cpi->maxio = (ISP_NSEG64_MAX - 1) * PAGE_SIZE;
+ else
+ cpi->maxio = (ISP_NSEG_MAX - 1) * PAGE_SIZE;
+
bus = cam_sim_bus(xpt_path_sim(cpi->ccb_h.path));
if (IS_FC(isp)) {
fcparam *fcp = FCPARAM(isp, bus);
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