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Date: Sun, 13 Jul 2014 14:36:45 +0200
From: Yann Droneaud <ydroneaud@...eya.com>
To: Hariprasad Shenai <hariprasad@...lsio.com>
Cc: netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
davem@...emloft.net, roland@...estorage.com,
swise@...ngridcomputing.com, leedom@...lsio.com,
nirranjan@...lsio.com, kumaras@...lsio.com
Subject: Re: [PATCH 3/4] cxgb4/iw_cxgb4: display TPTE on errors
Hi,
Le vendredi 11 juillet 2014 à 20:44 +0530, Hariprasad Shenai a écrit :
> With ingress WRITE or READ RESPONSE errors, HW provides the offending
> stag from the packet. This patch adds logic to log the parsed TPTE
> in this case. cxgb4 now exports a function to read a TPTE entry
> from adapter memory.
>
> Signed-off-by: Steve Wise <swise@...ngridcomputing.com>
> Signed-off-by: Hariprasad Shenai <hariprasad@...lsio.com>
> ---
> drivers/infiniband/hw/cxgb4/device.c | 27 ++++++++--
> drivers/infiniband/hw/cxgb4/ev.c | 53 ++++++++++++++++--
> drivers/infiniband/hw/cxgb4/t4.h | 4 +-
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 66 +++++++++++++++++++++++
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h | 1 +
> 5 files changed, 140 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
> index d2d3dba..e8b79a3 100644
> --- a/drivers/infiniband/hw/cxgb4/device.c
> +++ b/drivers/infiniband/hw/cxgb4/device.c
> @@ -241,12 +241,31 @@ static int dump_stag(int id, void *p, void *data)
> struct c4iw_debugfs_data *stagd = data;
> int space;
> int cc;
> + struct fw_ri_tpte tpte;
> + int ret;
>
> space = stagd->bufsize - stagd->pos - 1;
> if (space == 0)
> return 1;
>
> - cc = snprintf(stagd->buf + stagd->pos, space, "0x%x\n", id<<8);
> + ret = cxgb4_read_tpte(stagd->devp->rdev.lldi.ports[0], (u32)id<<8,
> + (__be32 *)&tpte);
> + if (ret) {
> + pr_info("%s cxgb4_read_tpte err %d\n", __func__, ret);
> + return ret;
If it's an error, use pr_err(), and perhaps better, dev_err().
> + }
> + cc = snprintf(stagd->buf + stagd->pos, space,
> + "stag: idx 0x%x valid %d key 0x%x state %d pdid %d "
> + "perm 0x%x ps %d len 0x%llx va 0x%llx\n",
> + (u32)id<<8,
> + G_FW_RI_TPTE_VALID(ntohl(tpte.valid_to_pdid)),
> + G_FW_RI_TPTE_STAGKEY(ntohl(tpte.valid_to_pdid)),
> + G_FW_RI_TPTE_STAGSTATE(ntohl(tpte.valid_to_pdid)),
> + G_FW_RI_TPTE_PDID(ntohl(tpte.valid_to_pdid)),
> + G_FW_RI_TPTE_PERM(ntohl(tpte.locread_to_qpid)),
> + G_FW_RI_TPTE_PS(ntohl(tpte.locread_to_qpid)),
> + ((u64)ntohl(tpte.len_hi) << 32) | ntohl(tpte.len_lo),
> + ((u64)ntohl(tpte.va_hi) << 32) | ntohl(tpte.va_lo_fbo));
> if (cc < space)
> stagd->pos += cc;
> return 0;
> @@ -259,7 +278,7 @@ static int stag_release(struct inode *inode, struct file *file)
> printk(KERN_INFO "%s null stagd?\n", __func__);
> return 0;
> }
> - kfree(stagd->buf);
> + vfree(stagd->buf);
> kfree(stagd);
> return 0;
> }
> @@ -282,8 +301,8 @@ static int stag_open(struct inode *inode, struct file *file)
> idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
> spin_unlock_irq(&stagd->devp->lock);
>
> - stagd->bufsize = count * sizeof("0x12345678\n");
> - stagd->buf = kmalloc(stagd->bufsize, GFP_KERNEL);
> + stagd->bufsize = count * 256;
> + stagd->buf = vmalloc(stagd->bufsize);
> if (!stagd->buf) {
> ret = -ENOMEM;
> goto err1;
> diff --git a/drivers/infiniband/hw/cxgb4/ev.c b/drivers/infiniband/hw/cxgb4/ev.c
> index d61d0a1..97379f4 100644
> --- a/drivers/infiniband/hw/cxgb4/ev.c
> +++ b/drivers/infiniband/hw/cxgb4/ev.c
> @@ -35,6 +35,53 @@
>
> #include "iw_cxgb4.h"
>
> +static void print_tpte(struct c4iw_dev *dev, u32 stag)
> +{
> + int ret;
> + struct fw_ri_tpte tpte;
> +
> + ret = cxgb4_read_tpte(dev->rdev.lldi.ports[0], stag,
> + (__be32 *)&tpte);
> + if (ret) {
> + pr_err("%s cxgb4_read_tpte err %d\n", __func__, ret);
pr_err() is used here. Perhaps dev_err() can be used here too.
> + return;
> + }
> + pr_err("stag idx 0x%x valid %d key 0x%x state %d pdid %d "
> + "perm 0x%x ps %d len 0x%llx va 0x%llx\n",
> + stag & 0xffffff00,
> + G_FW_RI_TPTE_VALID(ntohl(tpte.valid_to_pdid)),
> + G_FW_RI_TPTE_STAGKEY(ntohl(tpte.valid_to_pdid)),
> + G_FW_RI_TPTE_STAGSTATE(ntohl(tpte.valid_to_pdid)),
> + G_FW_RI_TPTE_PDID(ntohl(tpte.valid_to_pdid)),
> + G_FW_RI_TPTE_PERM(ntohl(tpte.locread_to_qpid)),
> + G_FW_RI_TPTE_PS(ntohl(tpte.locread_to_qpid)),
> + ((u64)ntohl(tpte.len_hi) << 32) | ntohl(tpte.len_lo),
> + ((u64)ntohl(tpte.va_hi) << 32) | ntohl(tpte.va_lo_fbo));
That's not an error.
Perhaps it's a debug message, then use dev_dbg().
> +}
> +
> +static void dump_err_cqe(struct c4iw_dev *dev, struct t4_cqe *err_cqe)
> +{
> + __be64 *p = (void *)err_cqe;
> +
> + pr_err("AE qpid %d opcode %d status 0x%x "
> + "type %d len 0x%x wrid.hi 0x%x wrid.lo 0x%x\n",
> + CQE_QPID(err_cqe), CQE_OPCODE(err_cqe),
> + CQE_STATUS(err_cqe), CQE_TYPE(err_cqe), ntohl(err_cqe->len),
> + CQE_WRID_HI(err_cqe), CQE_WRID_LOW(err_cqe));
> +
You could use dev_err().
> + pr_err("%016llx %016llx %016llx %016llx\n",
> + be64_to_cpu(p[0]), be64_to_cpu(p[1]), be64_to_cpu(p[2]),
> + be64_to_cpu(p[3]));
> +
Is it really required to do a "raw dump" of the err_cqe content ?
It looks like a debug message, so use dev_dbg().
> + /*
> + * Ingress WRITE and READ_RESP errors provide
> + * the offending stag, so parse and log it.
> + */
> + if (RQ_TYPE(err_cqe) && (CQE_OPCODE(err_cqe) == FW_RI_RDMA_WRITE ||
> + CQE_OPCODE(err_cqe) == FW_RI_READ_RESP))
> + print_tpte(dev, CQE_WRID_STAG(err_cqe));
> +}
> +
> static void post_qp_event(struct c4iw_dev *dev, struct c4iw_cq *chp,
> struct c4iw_qp *qhp,
> struct t4_cqe *err_cqe,
> @@ -44,11 +91,7 @@ static void post_qp_event(struct c4iw_dev *dev, struct c4iw_cq *chp,
> struct c4iw_qp_attributes attrs;
> unsigned long flag;
>
> - printk(KERN_ERR MOD "AE qpid 0x%x opcode %d status 0x%x "
> - "type %d wrid.hi 0x%x wrid.lo 0x%x\n",
> - CQE_QPID(err_cqe), CQE_OPCODE(err_cqe),
> - CQE_STATUS(err_cqe), CQE_TYPE(err_cqe),
> - CQE_WRID_HI(err_cqe), CQE_WRID_LOW(err_cqe));
> + dump_err_cqe(dev, err_cqe);
>
> if (qhp->attr.state == C4IW_QP_STATE_RTS) {
> attrs.next_state = C4IW_QP_STATE_TERMINATE;
> diff --git a/drivers/infiniband/hw/cxgb4/t4.h b/drivers/infiniband/hw/cxgb4/t4.h
> index e64fa8b..dd45186 100644
> --- a/drivers/infiniband/hw/cxgb4/t4.h
> +++ b/drivers/infiniband/hw/cxgb4/t4.h
> @@ -236,8 +236,8 @@ struct t4_cqe {
> #define CQE_WRID_SQ_IDX(x) ((x)->u.scqe.cidx)
>
> /* generic accessor macros */
> -#define CQE_WRID_HI(x) ((x)->u.gen.wrid_hi)
> -#define CQE_WRID_LOW(x) ((x)->u.gen.wrid_low)
> +#define CQE_WRID_HI(x) (be32_to_cpu((x)->u.gen.wrid_hi))
> +#define CQE_WRID_LOW(x) (be32_to_cpu((x)->u.gen.wrid_low))
Is these accessor macros used elsewhere ?
If yes, changing the endianness should be taken in account.
Perhaps this kink of change should be put in its own commit.
Regards.
--
Yann Droneaud
OPTEYA
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