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cxgb4: large receive offload support 

add large receive offload(LRO) support
for upper layer drivers.

Signed-off-by: Varun Prakash <varun@chelsio.com>
Acked-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Varun Prakash 2016-02-14 23:02:41 +05:30 committed by Nicholas Bellinger
parent f2692d16eb
commit 2337ba422c
4 changed files with 60 additions and 14 deletions
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14
drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
View File

@ -511,6 +511,15 @@ struct pkt_gl {
typedef int (*rspq_handler_t)(struct sge_rspq *q, const __be64 *rsp,
const struct pkt_gl *gl);
typedef void (*rspq_flush_handler_t)(struct sge_rspq *q);
/* LRO related declarations for ULD */
struct t4_lro_mgr {
#define MAX_LRO_SESSIONS 64
u8 lro_session_cnt; /* # of sessions to aggregate */
unsigned long lro_pkts; /* # of LRO super packets */
unsigned long lro_merged; /* # of wire packets merged by LRO */
struct sk_buff_head lroq; /* list of aggregated sessions */
};
struct sge_rspq { /* state for an SGE response queue */
struct napi_struct napi;
@ -535,6 +544,8 @@ struct sge_rspq { /* state for an SGE response queue */
struct adapter *adap;
struct net_device *netdev; /* associated net device */
rspq_handler_t handler;
rspq_flush_handler_t flush_handler;
struct t4_lro_mgr lro_mgr;
#ifdef CONFIG_NET_RX_BUSY_POLL
#define CXGB_POLL_STATE_IDLE 0
#define CXGB_POLL_STATE_NAPI BIT(0) /* NAPI owns this poll */
@ -1114,7 +1125,8 @@ int t4_mgmt_tx(struct adapter *adap, struct sk_buff *skb);
int t4_ofld_send(struct adapter *adap, struct sk_buff *skb);
int t4_sge_alloc_rxq(struct adapter *adap, struct sge_rspq *iq, bool fwevtq,
struct net_device *dev, int intr_idx,
struct sge_fl *fl, rspq_handler_t hnd, int cong);
struct sge_fl *fl, rspq_handler_t hnd,
rspq_flush_handler_t flush_handler, int cong);
int t4_sge_alloc_eth_txq(struct adapter *adap, struct sge_eth_txq *txq,
struct net_device *dev, struct netdev_queue *netdevq,
unsigned int iqid);

42
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
View File

@ -640,6 +640,13 @@ out:
return 0;
}
/* Flush the aggregated lro sessions */
static void uldrx_flush_handler(struct sge_rspq *q)
{
if (ulds[q->uld].lro_flush)
ulds[q->uld].lro_flush(&q->lro_mgr);
}
/**
* uldrx_handler - response queue handler for ULD queues
* @q: the response queue that received the packet
@ -653,6 +660,7 @@ static int uldrx_handler(struct sge_rspq *q, const __be64 *rsp,
const struct pkt_gl *gl)
{
struct sge_ofld_rxq *rxq = container_of(q, struct sge_ofld_rxq, rspq);
int ret;
/* FW can send CPLs encapsulated in a CPL_FW4_MSG.
*/
@ -660,10 +668,19 @@ static int uldrx_handler(struct sge_rspq *q, const __be64 *rsp,
((const struct cpl_fw4_msg *)(rsp + 1))->type == FW_TYPE_RSSCPL)
rsp += 2;
if (ulds[q->uld].rx_handler(q->adap->uld_handle[q->uld], rsp, gl)) {
if (q->flush_handler)
ret = ulds[q->uld].lro_rx_handler(q->adap->uld_handle[q->uld],
rsp, gl, &q->lro_mgr,
&q->napi);
else
ret = ulds[q->uld].rx_handler(q->adap->uld_handle[q->uld],
rsp, gl);
if (ret) {
rxq->stats.nomem++;
return -1;
}
if (gl == NULL)
rxq->stats.imm++;
else if (gl == CXGB4_MSG_AN)
@ -980,7 +997,7 @@ static void enable_rx(struct adapter *adap)
static int alloc_ofld_rxqs(struct adapter *adap, struct sge_ofld_rxq *q,
unsigned int nq, unsigned int per_chan, int msi_idx,
u16 *ids)
u16 *ids, bool lro)
{
int i, err;
@ -990,7 +1007,9 @@ static int alloc_ofld_rxqs(struct adapter *adap, struct sge_ofld_rxq *q,
err = t4_sge_alloc_rxq(adap, &q->rspq, false,
adap->port[i / per_chan],
msi_idx, q->fl.size ? &q->fl : NULL,
uldrx_handler, 0);
uldrx_handler,
lro ? uldrx_flush_handler : NULL,
0);
if (err)
return err;
memset(&q->stats, 0, sizeof(q->stats));
@ -1020,7 +1039,7 @@ static int setup_sge_queues(struct adapter *adap)
msi_idx = 1; /* vector 0 is for non-queue interrupts */
else {
err = t4_sge_alloc_rxq(adap, &s->intrq, false, adap->port[0], 0,
NULL, NULL, -1);
NULL, NULL, NULL, -1);
if (err)
return err;
msi_idx = -((int)s->intrq.abs_id + 1);
@ -1040,7 +1059,7 @@ static int setup_sge_queues(struct adapter *adap)
* new/deleted queues.
*/
err = t4_sge_alloc_rxq(adap, &s->fw_evtq, true, adap->port[0],
msi_idx, NULL, fwevtq_handler, -1);
msi_idx, NULL, fwevtq_handler, NULL, -1);
if (err) {
freeout: t4_free_sge_resources(adap);
return err;
@ -1058,6 +1077,7 @@ freeout: t4_free_sge_resources(adap);
err = t4_sge_alloc_rxq(adap, &q->rspq, false, dev,
msi_idx, &q->fl,
t4_ethrx_handler,
NULL,
t4_get_mps_bg_map(adap,
pi->tx_chan));
if (err)
@ -1083,19 +1103,19 @@ freeout: t4_free_sge_resources(adap);
goto freeout;
}
#define ALLOC_OFLD_RXQS(firstq, nq, per_chan, ids) do { \
err = alloc_ofld_rxqs(adap, firstq, nq, per_chan, msi_idx, ids); \
#define ALLOC_OFLD_RXQS(firstq, nq, per_chan, ids, lro) do { \
err = alloc_ofld_rxqs(adap, firstq, nq, per_chan, msi_idx, ids, lro); \
if (err) \
goto freeout; \
if (msi_idx > 0) \
msi_idx += nq; \
} while (0)
ALLOC_OFLD_RXQS(s->iscsirxq, s->iscsiqsets, j, s->iscsi_rxq);
ALLOC_OFLD_RXQS(s->iscsitrxq, s->niscsitq, j, s->iscsit_rxq);
ALLOC_OFLD_RXQS(s->rdmarxq, s->rdmaqs, 1, s->rdma_rxq);
ALLOC_OFLD_RXQS(s->iscsirxq, s->iscsiqsets, j, s->iscsi_rxq, false);
ALLOC_OFLD_RXQS(s->iscsitrxq, s->niscsitq, j, s->iscsit_rxq, true);
ALLOC_OFLD_RXQS(s->rdmarxq, s->rdmaqs, 1, s->rdma_rxq, false);
j = s->rdmaciqs / adap->params.nports; /* rdmaq queues per channel */
ALLOC_OFLD_RXQS(s->rdmaciq, s->rdmaciqs, j, s->rdma_ciq);
ALLOC_OFLD_RXQS(s->rdmaciq, s->rdmaciqs, j, s->rdma_ciq, false);
#undef ALLOC_OFLD_RXQS

6
drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h
View File

@ -213,6 +213,7 @@ struct l2t_data;
struct net_device;
struct pkt_gl;
struct tp_tcp_stats;
struct t4_lro_mgr;
struct cxgb4_range {
unsigned int start;
@ -284,6 +285,11 @@ struct cxgb4_uld_info {
const struct pkt_gl *gl);
int (*state_change)(void *handle, enum cxgb4_state new_state);
int (*control)(void *handle, enum cxgb4_control control, ...);
int (*lro_rx_handler)(void *handle, const __be64 *rsp,
const struct pkt_gl *gl,
struct t4_lro_mgr *lro_mgr,
struct napi_struct *napi);
void (*lro_flush)(struct t4_lro_mgr *);
};
int cxgb4_register_uld(enum cxgb4_uld type, const struct cxgb4_uld_info *p);

12
drivers/net/ethernet/chelsio/cxgb4/sge.c
View File

@ -2157,8 +2157,11 @@ static int process_responses(struct sge_rspq *q, int budget)
while (likely(budget_left)) {
rc = (void *)q->cur_desc + (q->iqe_len - sizeof(*rc));
if (!is_new_response(rc, q))
if (!is_new_response(rc, q)) {
if (q->flush_handler)
q->flush_handler(q);
break;
}
dma_rmb();
rsp_type = RSPD_TYPE_G(rc->type_gen);
@ -2544,7 +2547,8 @@ static void __iomem *bar2_address(struct adapter *adapter,
*/
int t4_sge_alloc_rxq(struct adapter *adap, struct sge_rspq *iq, bool fwevtq,
struct net_device *dev, int intr_idx,
struct sge_fl *fl, rspq_handler_t hnd, int cong)
struct sge_fl *fl, rspq_handler_t hnd,
rspq_flush_handler_t flush_hnd, int cong)
{
int ret, flsz = 0;
struct fw_iq_cmd c;
@ -2638,6 +2642,10 @@ int t4_sge_alloc_rxq(struct adapter *adap, struct sge_rspq *iq, bool fwevtq,
iq->size--; /* subtract status entry */
iq->netdev = dev;
iq->handler = hnd;
iq->flush_handler = flush_hnd;
memset(&iq->lro_mgr, 0, sizeof(struct t4_lro_mgr));
skb_queue_head_init(&iq->lro_mgr.lroq);
/* set offset to -1 to distinguish ingress queues without FL */
iq->offset = fl ? 0 : -1;