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cxgb4: Stop Rx Queues before freeing it up 

Stop all Ethernet RX Queues before freeing up various Ingress/Egress
Queues, etc. We were seeing cases of Ingress Queues not getting serviced
during the shutdown process leading to Ingress Paths jamming up through
the chip and blocking the shutdown effort itself.

One such case involved the Firmware sending a "Flush Token" through the
ULP-TX -> ULP-RX path for an Ethernet TX Queue being freed in order to
make sure there weren't any remaining TX Work Requests in the pipeline.
But the return path was stalled by Ingress Data unable to be delivered to
the Host because those Ingress Queues were no longer being serviced.

Based on original work by Casey Leedom <leedom@chelsio.com>

Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hariprasad Shenai 2016-04-11 11:07:58 +05:30 committed by David S. Miller
parent 734e00fa02
commit ebf4dc2b1b
3 changed files with 53 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
View File

@ -1451,6 +1451,9 @@ int t4_mdio_rd(struct adapter *adap, unsigned int mbox, unsigned int phy_addr,
unsigned int mmd, unsigned int reg, u16 *valp);
int t4_mdio_wr(struct adapter *adap, unsigned int mbox, unsigned int phy_addr,
unsigned int mmd, unsigned int reg, u16 val);
int t4_iq_stop(struct adapter *adap, unsigned int mbox, unsigned int pf,
unsigned int vf, unsigned int iqtype, unsigned int iqid,
unsigned int fl0id, unsigned int fl1id);
int t4_iq_free(struct adapter *adap, unsigned int mbox, unsigned int pf,
unsigned int vf, unsigned int iqtype, unsigned int iqid,
unsigned int fl0id, unsigned int fl1id);

20
drivers/net/ethernet/chelsio/cxgb4/sge.c
View File

@ -2981,14 +2981,28 @@ void t4_free_ofld_rxqs(struct adapter *adap, int n, struct sge_ofld_rxq *q)
void t4_free_sge_resources(struct adapter *adap)
{
int i;
struct sge_eth_rxq *eq = adap->sge.ethrxq;
struct sge_eth_txq *etq = adap->sge.ethtxq;
struct sge_eth_rxq *eq;
struct sge_eth_txq *etq;
/* stop all Rx queues in order to start them draining */
for (i = 0; i < adap->sge.ethqsets; i++) {
eq = &adap->sge.ethrxq[i];
if (eq->rspq.desc)
t4_iq_stop(adap, adap->mbox, adap->pf, 0,
FW_IQ_TYPE_FL_INT_CAP,
eq->rspq.cntxt_id,
eq->fl.size ? eq->fl.cntxt_id : 0xffff,
0xffff);
}
/* clean up Ethernet Tx/Rx queues */
for (i = 0; i < adap->sge.ethqsets; i++, eq++, etq++) {
for (i = 0; i < adap->sge.ethqsets; i++) {
eq = &adap->sge.ethrxq[i];
if (eq->rspq.desc)
free_rspq_fl(adap, &eq->rspq,
eq->fl.size ? &eq->fl : NULL);
etq = &adap->sge.ethtxq[i];
if (etq->q.desc) {
t4_eth_eq_free(adap, adap->mbox, adap->pf, 0,
etq->q.cntxt_id);

33
drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
View File

@ -6939,6 +6939,39 @@ int t4_identify_port(struct adapter *adap, unsigned int mbox, unsigned int viid,
return t4_wr_mbox(adap, mbox, &c, sizeof(c), NULL);
}
/**
* t4_iq_stop - stop an ingress queue and its FLs
* @adap: the adapter
* @mbox: mailbox to use for the FW command
* @pf: the PF owning the queues
* @vf: the VF owning the queues
* @iqtype: the ingress queue type (FW_IQ_TYPE_FL_INT_CAP, etc.)
* @iqid: ingress queue id
* @fl0id: FL0 queue id or 0xffff if no attached FL0
* @fl1id: FL1 queue id or 0xffff if no attached FL1
*
* Stops an ingress queue and its associated FLs, if any. This causes
* any current or future data/messages destined for these queues to be
* tossed.
*/
int t4_iq_stop(struct adapter *adap, unsigned int mbox, unsigned int pf,
unsigned int vf, unsigned int iqtype, unsigned int iqid,
unsigned int fl0id, unsigned int fl1id)
{
struct fw_iq_cmd c;
memset(&c, 0, sizeof(c));
c.op_to_vfn = cpu_to_be32(FW_CMD_OP_V(FW_IQ_CMD) | FW_CMD_REQUEST_F |
FW_CMD_EXEC_F | FW_IQ_CMD_PFN_V(pf) |
FW_IQ_CMD_VFN_V(vf));
c.alloc_to_len16 = cpu_to_be32(FW_IQ_CMD_IQSTOP_F | FW_LEN16(c));
c.type_to_iqandstindex = cpu_to_be32(FW_IQ_CMD_TYPE_V(iqtype));
c.iqid = cpu_to_be16(iqid);
c.fl0id = cpu_to_be16(fl0id);
c.fl1id = cpu_to_be16(fl1id);
return t4_wr_mbox(adap, mbox, &c, sizeof(c), NULL);
}
/**
* t4_iq_free - free an ingress queue and its FLs
* @adap: the adapter