diff options
| -rw-r--r-- | drivers/infiniband/hw/ipath/ipath_common.h | 19 | ||||
| -rw-r--r-- | drivers/infiniband/hw/ipath/ipath_diag.c | 39 |
2 files changed, 52 insertions, 6 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_common.h b/drivers/infiniband/hw/ipath/ipath_common.h index 12e1349cd03..f70788c25ea 100644 --- a/drivers/infiniband/hw/ipath/ipath_common.h +++ b/drivers/infiniband/hw/ipath/ipath_common.h @@ -501,13 +501,30 @@ struct __ipath_sendpkt { struct ipath_iovec sps_iov[4]; }; -/* Passed into diag data special file's ->write method. */ +/* + * diagnostics can send a packet by "writing" one of the following + * two structs to diag data special file + * The first is the legacy version for backward compatibility + */ struct ipath_diag_pkt { __u32 unit; __u64 data; __u32 len; }; +/* The second diag_pkt struct is the expanded version that allows + * more control over the packet, specifically, by allowing a custom + * pbc (+ extra) qword, so that special modes and deliberate + * changes to CRCs can be used. The elements were also re-ordered + * for better alignment and to avoid padding issues. + */ +struct ipath_diag_xpkt { + __u64 data; + __u64 pbc_wd; + __u32 unit; + __u32 len; +}; + /* * Data layout in I2C flash (for GUID, etc.) * All fields are little-endian binary unless otherwise stated diff --git a/drivers/infiniband/hw/ipath/ipath_diag.c b/drivers/infiniband/hw/ipath/ipath_diag.c index 63e8368b0e9..aab21c1b822 100644 --- a/drivers/infiniband/hw/ipath/ipath_diag.c +++ b/drivers/infiniband/hw/ipath/ipath_diag.c @@ -323,13 +323,14 @@ static ssize_t ipath_diagpkt_write(struct file *fp, { u32 __iomem *piobuf; u32 plen, clen, pbufn; - struct ipath_diag_pkt dp; + struct ipath_diag_pkt odp; + struct ipath_diag_xpkt dp; u32 *tmpbuf = NULL; struct ipath_devdata *dd; ssize_t ret = 0; u64 val; - if (count < sizeof(dp)) { + if (count != sizeof(dp)) { ret = -EINVAL; goto bail; } @@ -339,6 +340,29 @@ static ssize_t ipath_diagpkt_write(struct file *fp, goto bail; } + /* + * Due to padding/alignment issues (lessened with new struct) + * the old and new structs are the same length. We need to + * disambiguate them, which we can do because odp.len has never + * been less than the total of LRH+BTH+DETH so far, while + * dp.unit (same offset) unit is unlikely to get that high. + * Similarly, dp.data, the pointer to user at the same offset + * as odp.unit, is almost certainly at least one (512byte)page + * "above" NULL. The if-block below can be omitted if compatibility + * between a new driver and older diagnostic code is unimportant. + * compatibility the other direction (new diags, old driver) is + * handled in the diagnostic code, with a warning. + */ + if (dp.unit >= 20 && dp.data < 512) { + /* very probable version mismatch. Fix it up */ + memcpy(&odp, &dp, sizeof(odp)); + /* We got a legacy dp, copy elements to dp */ + dp.unit = odp.unit; + dp.data = odp.data; + dp.len = odp.len; + dp.pbc_wd = 0; /* Indicate we need to compute PBC wd */ + } + /* send count must be an exact number of dwords */ if (dp.len & 3) { ret = -EINVAL; @@ -371,9 +395,10 @@ static ssize_t ipath_diagpkt_write(struct file *fp, ret = -ENODEV; goto bail; } + /* Check link state, but not if we have custom PBC */ val = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK; - if (val != IPATH_IBSTATE_INIT && val != IPATH_IBSTATE_ARM && - val != IPATH_IBSTATE_ACTIVE) { + if (!dp.pbc_wd && val != IPATH_IBSTATE_INIT && + val != IPATH_IBSTATE_ARM && val != IPATH_IBSTATE_ACTIVE) { ipath_cdbg(VERBOSE, "unit %u not ready (state %llx)\n", dd->ipath_unit, (unsigned long long) val); ret = -EINVAL; @@ -419,9 +444,13 @@ static ssize_t ipath_diagpkt_write(struct file *fp, ipath_cdbg(VERBOSE, "unit %u 0x%x+1w pio%d\n", dd->ipath_unit, plen - 1, pbufn); + if (dp.pbc_wd == 0) + /* Legacy operation, use computed pbc_wd */ + dp.pbc_wd = plen; + /* we have to flush after the PBC for correctness on some cpus * or WC buffer can be written out of order */ - writeq(plen, piobuf); + writeq(dp.pbc_wd, piobuf); ipath_flush_wc(); /* copy all by the trigger word, then flush, so it's written * to chip before trigger word, then write trigger word, then |