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IB/ipath: Enable 4KB MTU

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Enable use of 4KB MTU.  Since the driver uses more pinned memory for
receive buffers when the 4KB MTU is enabled, whether or not the fabric
supports that MTU, add a "mtu4096" module parameter that can be used to
limit the MTU to 2KB when it is known that 4KB MTUs can't be used
anyway.

Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Dave Olson 2008-04-16 21:01:12 -07:00 committed by Roland Dreier
parent 5d1ce03dd3
commit 826d801009
8 changed files with 45 additions and 65 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/infiniband/hw/ipath/ipath_driver.c
View File

@ -73,6 +73,10 @@ module_param_named(debug, ipath_debug, uint, S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(debug, "mask for debug prints");
EXPORT_SYMBOL_GPL(ipath_debug);
unsigned ipath_mtu4096 = 1; /* max 4KB IB mtu by default, if supported */
module_param_named(mtu4096, ipath_mtu4096, uint, S_IRUGO);
MODULE_PARM_DESC(mtu4096, "enable MTU of 4096 bytes, if supported");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("QLogic <support@pathscale.com>");
MODULE_DESCRIPTION("QLogic InfiniPath driver");
@ -1800,7 +1804,7 @@ int ipath_set_mtu(struct ipath_devdata *dd, u16 arg)
* piosize). We check that it's one of the valid IB sizes.
*/
if (arg != 256 && arg != 512 && arg != 1024 && arg != 2048 &&
arg != 4096) {
(arg != 4096 || !ipath_mtu4096)) {
ipath_dbg("Trying to set invalid mtu %u, failing\n", arg);
ret = -EINVAL;
goto bail;
@ -1816,6 +1820,8 @@ int ipath_set_mtu(struct ipath_devdata *dd, u16 arg)
if (arg >= (piosize - IPATH_PIO_MAXIBHDR)) {
/* Only if it's not the initial value (or reset to it) */
if (piosize != dd->ipath_init_ibmaxlen) {
if (arg > piosize && arg <= dd->ipath_init_ibmaxlen)
piosize = dd->ipath_init_ibmaxlen;
dd->ipath_ibmaxlen = piosize;
changed = 1;
}
@ -1829,24 +1835,17 @@ int ipath_set_mtu(struct ipath_devdata *dd, u16 arg)
}
if (changed) {
u64 ibc = dd->ipath_ibcctrl, ibdw;
/*
* set the IBC maxpktlength to the size of our pio
* buffers in words
* update our housekeeping variables, and set IBC max
* size, same as init code; max IBC is max we allow in
* buffer, less the qword pbc, plus 1 for ICRC, in dwords
*/
u64 ibc = dd->ipath_ibcctrl;
dd->ipath_ibmaxlen = piosize - 2 * sizeof(u32);
ibdw = (dd->ipath_ibmaxlen >> 2) + 1;
ibc &= ~(INFINIPATH_IBCC_MAXPKTLEN_MASK <<
INFINIPATH_IBCC_MAXPKTLEN_SHIFT);
piosize = piosize - 2 * sizeof(u32); /* ignore pbc */
dd->ipath_ibmaxlen = piosize;
piosize /= sizeof(u32); /* in words */
/*
* for ICRC, which we only send in diag test pkt mode, and
* we don't need to worry about that for mtu
*/
piosize += 1;
ibc |= piosize << INFINIPATH_IBCC_MAXPKTLEN_SHIFT;
dd->ibcc_mpl_shift);
ibc |= ibdw << dd->ibcc_mpl_shift;
dd->ipath_ibcctrl = ibc;
ipath_write_kreg(dd, dd->ipath_kregs->kr_ibcctrl,
dd->ipath_ibcctrl);

7
drivers/infiniband/hw/ipath/ipath_file_ops.c
View File

@ -219,7 +219,12 @@ static int ipath_get_base_info(struct file *fp,
kinfo->spi_pioalign = dd->ipath_palign;
kinfo->spi_qpair = IPATH_KD_QP;
kinfo->spi_piosize = dd->ipath_ibmaxlen;
/*
* user mode PIO buffers are always 2KB, even when 4KB can
* be received, and sent via the kernel; this is ibmaxlen
* for 2K MTU.
*/
kinfo->spi_piosize = dd->ipath_piosize2k - 2 * sizeof(u32);
kinfo->spi_mtu = dd->ipath_ibmaxlen; /* maxlen, not ibmtu */
kinfo->spi_port = pd->port_port;
kinfo->spi_subport = subport_fp(fp);

10
drivers/infiniband/hw/ipath/ipath_iba6120.c
View File

@ -1441,17 +1441,13 @@ static int ipath_pe_early_init(struct ipath_devdata *dd)
dd->ipath_egrtidbase = (u64 __iomem *)
((char __iomem *) dd->ipath_kregbase + dd->ipath_rcvegrbase);
/*
* To truly support a 4KB MTU (for usermode), we need to
* bump this to a larger value. For now, we use them for
* the kernel only.
*/
dd->ipath_rcvegrbufsize = 2048;
dd->ipath_rcvegrbufsize = ipath_mtu4096 ? 4096 : 2048;
/*
* the min() check here is currently a nop, but it may not always
* be, depending on just how we do ipath_rcvegrbufsize
*/
dd->ipath_ibmaxlen = min(dd->ipath_piosize2k,
dd->ipath_ibmaxlen = min(ipath_mtu4096 ? dd->ipath_piosize4k :
dd->ipath_piosize2k,
dd->ipath_rcvegrbufsize +
(dd->ipath_rcvhdrentsize << 2));
dd->ipath_init_ibmaxlen = dd->ipath_ibmaxlen;

30
drivers/infiniband/hw/ipath/ipath_init_chip.c
View File

@ -155,24 +155,13 @@ static int bringup_link(struct ipath_devdata *dd)
dd->ipath_control);
/*
* Note that prior to try 14 or 15 of IB, the credit scaling
* wasn't working, because it was swapped for writes with the
* 1 bit default linkstate field
* set initial max size pkt IBC will send, including ICRC; it's the
* PIO buffer size in dwords, less 1; also see ipath_set_mtu()
*/
val = (dd->ipath_ibmaxlen >> 2) + 1;
ibc = val << dd->ibcc_mpl_shift;
/* ignore pbc and align word */
val = dd->ipath_piosize2k - 2 * sizeof(u32);
/*
* for ICRC, which we only send in diag test pkt mode, and we
* don't need to worry about that for mtu
*/
val += 1;
/*
* Set the IBC maxpktlength to the size of our pio buffers the
* maxpktlength is in words. This is *not* the IB data MTU.
*/
ibc = (val / sizeof(u32)) << INFINIPATH_IBCC_MAXPKTLEN_SHIFT;
/* in KB */
/* flowcontrolwatermark is in units of KBytes */
ibc |= 0x5ULL << INFINIPATH_IBCC_FLOWCTRLWATERMARK_SHIFT;
/*
* How often flowctrl sent. More or less in usecs; balance against
@ -295,12 +284,9 @@ static int init_chip_first(struct ipath_devdata *dd,
val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiosize);
dd->ipath_piosize2k = val & ~0U;
dd->ipath_piosize4k = val >> 32;
/*
* Note: the chips support a maximum MTU of 4096, but the driver
* hasn't implemented this feature yet, so set the initial value
* to 2048.
*/
dd->ipath_ibmtu = 2048;
if (dd->ipath_piosize4k == 0 && ipath_mtu4096)
ipath_mtu4096 = 0; /* 4KB not supported by this chip */
dd->ipath_ibmtu = ipath_mtu4096 ? 4096 : 2048;
val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiobufcnt);
dd->ipath_piobcnt2k = val & ~0U;
dd->ipath_piobcnt4k = val >> 32;

1
drivers/infiniband/hw/ipath/ipath_kernel.h
View File

@ -1066,6 +1066,7 @@ dma_addr_t ipath_map_single(struct pci_dev *, void *, size_t, int);
#endif
extern unsigned ipath_debug; /* debugging bit mask */
extern unsigned ipath_mtu4096;
#define IPATH_MAX_PARITY_ATTEMPTS 10000 /* max times to try recovery */

12
drivers/infiniband/hw/ipath/ipath_mad.c
View File

@ -292,13 +292,9 @@ static int recv_subn_get_portinfo(struct ib_smp *smp,
/* pip->vl_arb_high_cap; // only one VL */
/* pip->vl_arb_low_cap; // only one VL */
/* InitTypeReply = 0 */
/*
* Note: the chips support a maximum MTU of 4096, but the driver
* hasn't implemented this feature yet, so set the maximum value
* to 2048.
*/
pip->inittypereply_mtucap = IB_MTU_2048;
// HCAs ignore VLStallCount and HOQLife
/* our mtu cap depends on whether 4K MTU enabled or not */
pip->inittypereply_mtucap = ipath_mtu4096 ? IB_MTU_4096 : IB_MTU_2048;
/* HCAs ignore VLStallCount and HOQLife */
/* pip->vlstallcnt_hoqlife; */
pip->operationalvl_pei_peo_fpi_fpo = 0x10; /* OVLs = 1 */
pip->mkey_violations = cpu_to_be16(dev->mkey_violations);
@ -491,6 +487,8 @@ static int recv_subn_set_portinfo(struct ib_smp *smp,
mtu = 2048;
break;
case IB_MTU_4096:
if (!ipath_mtu4096)
goto err;
mtu = 4096;
break;
default:

12
drivers/infiniband/hw/ipath/ipath_qp.c
View File

@ -516,13 +516,13 @@ int ipath_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
goto inval;
/*
* Note: the chips support a maximum MTU of 4096, but the driver
* hasn't implemented this feature yet, so don't allow Path MTU
* values greater than 2048.
* don't allow invalid Path MTU values or greater than 2048
* unless we are configured for a 4KB MTU
*/
if (attr_mask & IB_QP_PATH_MTU)
if (attr->path_mtu > IB_MTU_2048)
goto inval;
if ((attr_mask & IB_QP_PATH_MTU) &&
(ib_mtu_enum_to_int(attr->path_mtu) == -1 ||
(attr->path_mtu > IB_MTU_2048 && !ipath_mtu4096)))
goto inval;
if (attr_mask & IB_QP_PATH_MIG_STATE)
if (attr->path_mig_state != IB_MIG_MIGRATED &&

7
drivers/infiniband/hw/ipath/ipath_verbs.c
View File

@ -1201,12 +1201,7 @@ static int ipath_query_port(struct ib_device *ibdev,
props->max_vl_num = 1; /* VLCap = VL0 */
props->init_type_reply = 0;
/*
* Note: the chip supports a maximum MTU of 4096, but the driver
* hasn't implemented this feature yet, so set the maximum value
* to 2048.
*/
props->max_mtu = IB_MTU_2048;
props->max_mtu = ipath_mtu4096 ? IB_MTU_4096 : IB_MTU_2048;
switch (dd->ipath_ibmtu) {
case 4096:
mtu = IB_MTU_4096;