CXGBE PMD rx allocates a new mbuf everytime, which could lead to performance
hit. Instead, do bulk allocation of mbufs and re-use them.
Also, simplify the overall rx-handler, and update its logic to fix rx perf.
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy at chelsio.com>
Signed-off-by: Kumar Sanghvi <kumaras at chelsio.com>
---
drivers/net/cxgbe/base/adapter.h | 2 +
drivers/net/cxgbe/base/t4_regs_values.h | 1 +
drivers/net/cxgbe/sge.c | 239 ++++++++++++--------------------
3 files changed, 89 insertions(+), 153 deletions(-)
diff --git a/drivers/net/cxgbe/base/adapter.h b/drivers/net/cxgbe/base/adapter.h
index 0ea1c95..a1e8ef7 100644
--- a/drivers/net/cxgbe/base/adapter.h
+++ b/drivers/net/cxgbe/base/adapter.h
@@ -149,6 +149,7 @@ struct sge_rspq { /* state for an SGE
response queue */
unsigned int bar2_qid; /* Queue ID for BAR2 Queue registers */
unsigned int cidx; /* consumer index */
+ unsigned int gts_idx; /* last gts write sent */
unsigned int iqe_len; /* entry size */
unsigned int size; /* capacity of response queue */
int offset; /* offset into current Rx buffer */
@@ -157,6 +158,7 @@ struct sge_rspq { /* state for an SGE
response queue */
u8 intr_params; /* interrupt holdoff parameters */
u8 next_intr_params; /* holdoff params for next interrupt */
u8 pktcnt_idx; /* interrupt packet threshold */
+ u8 port_id; /* associated port-id */
u8 idx; /* queue index within its group */
u16 cntxt_id; /* SGE relative QID for the response Q */
u16 abs_id; /* absolute SGE id for the response q */
diff --git a/drivers/net/cxgbe/base/t4_regs_values.h
b/drivers/net/cxgbe/base/t4_regs_values.h
index 181bd9d..d7d3144 100644
--- a/drivers/net/cxgbe/base/t4_regs_values.h
+++ b/drivers/net/cxgbe/base/t4_regs_values.h
@@ -68,6 +68,7 @@
* Egress Context field values
*/
#define X_FETCHBURSTMIN_64B 2
+#define X_FETCHBURSTMIN_128B 3
#define X_FETCHBURSTMAX_256B 2
#define X_FETCHBURSTMAX_512B 3
diff --git a/drivers/net/cxgbe/sge.c b/drivers/net/cxgbe/sge.c
index 359296e..b737183 100644
--- a/drivers/net/cxgbe/sge.c
+++ b/drivers/net/cxgbe/sge.c
@@ -74,7 +74,7 @@ static inline void ship_tx_pkt_coalesce_wr(struct adapter
*adap,
/*
* Max number of Rx buffers we replenish at a time.
*/
-#define MAX_RX_REFILL 16U
+#define MAX_RX_REFILL 64U
#define NOMEM_TMR_IDX (SGE_NTIMERS - 1)
@@ -238,39 +238,6 @@ static inline bool fl_starving(const struct adapter
*adapter,
return fl->avail - fl->pend_cred <= s->fl_starve_thres;
}
-static inline unsigned int get_buf_size(struct adapter *adapter,
- const struct rx_sw_desc *d)
-{
- struct sge *s = &adapter->sge;
- unsigned int rx_buf_size_idx = d->dma_addr & RX_BUF_SIZE;
- unsigned int buf_size;
-
- switch (rx_buf_size_idx) {
- case RX_SMALL_PG_BUF:
- buf_size = PAGE_SIZE;
- break;
-
- case RX_LARGE_PG_BUF:
- buf_size = PAGE_SIZE << s->fl_pg_order;
- break;
-
- case RX_SMALL_MTU_BUF:
- buf_size = FL_MTU_SMALL_BUFSIZE(adapter);
- break;
-
- case RX_LARGE_MTU_BUF:
- buf_size = FL_MTU_LARGE_BUFSIZE(adapter);
- break;
-
- default:
- BUG_ON(1);
- buf_size = 0; /* deal with bogus compiler warnings */
- /* NOTREACHED */
- }
-
- return buf_size;
-}
-
/**
* free_rx_bufs - free the Rx buffers on an SGE free list
* @q: the SGE free list to free buffers from
@@ -319,7 +286,8 @@ static void unmap_rx_buf(struct sge_fl *q)
static inline void ring_fl_db(struct adapter *adap, struct sge_fl *q)
{
- if (q->pend_cred >= 8) {
+ /* see if we have exceeded q->size / 4 */
+ if (q->pend_cred >= (q->size / 4)) {
u32 val = adap->params.arch.sge_fl_db;
if (is_t4(adap->params.chip))
@@ -356,15 +324,6 @@ static inline void ring_fl_db(struct adapter *adap, struct
sge_fl *q)
}
}
-static inline struct rte_mbuf *cxgbe_rxmbuf_alloc(struct rte_mempool *mp)
-{
- struct rte_mbuf *m;
-
- m = __rte_mbuf_raw_alloc(mp);
- __rte_mbuf_sanity_check_raw(m, 0);
- return m;
-}
-
static inline void set_rx_sw_desc(struct rx_sw_desc *sd, void *buf,
dma_addr_t mapping)
{
@@ -393,9 +352,20 @@ static unsigned int refill_fl_usembufs(struct adapter
*adap, struct sge_fl *q,
__be64 *d = &q->desc[q->pidx];
struct rx_sw_desc *sd = &q->sdesc[q->pidx];
unsigned int buf_size_idx = RX_SMALL_MTU_BUF;
+ struct rte_mbuf *buf_bulk[n];
+ int ret, i;
- while (n--) {
- struct rte_mbuf *mbuf = cxgbe_rxmbuf_alloc(rxq->rspq.mb_pool);
+ ret = rte_mempool_get_bulk(rxq->rspq.mb_pool, (void *)buf_bulk, n);
+ if (unlikely(ret != 0)) {
+ dev_debug(adap, "%s: failed to allocated fl entries in bulk
..\n",
+ __func__);
+ q->alloc_failed++;
+ rxq->rspq.eth_dev->data->rx_mbuf_alloc_failed++;
+ goto out;
+ }
+
+ for (i = 0; i < n; i++) {
+ struct rte_mbuf *mbuf = buf_bulk[i];
dma_addr_t mapping;
if (!mbuf) {
@@ -405,11 +375,13 @@ static unsigned int refill_fl_usembufs(struct adapter
*adap, struct sge_fl *q,
goto out;
}
+ rte_mbuf_refcnt_set(mbuf, 1);
mbuf->data_off = RTE_PKTMBUF_HEADROOM;
mbuf->next = NULL;
+ mbuf->nb_segs = 1;
+ mbuf->port = rxq->rspq.port_id;
mapping = (dma_addr_t)(mbuf->buf_physaddr + mbuf->data_off);
-
mapping |= buf_size_idx;
*d++ = cpu_to_be64(mapping);
set_rx_sw_desc(sd, mbuf, mapping);
@@ -668,6 +640,7 @@ static void write_sgl(struct rte_mbuf *mbuf, struct sge_txq
*q,
((head) >= (tail) ? (head) - (tail) : (wrap) - (tail) + (head))
#define Q_IDXDIFF(q, idx) IDXDIFF((q)->pidx, (q)->idx, (q)->size)
+#define R_IDXDIFF(q, idx) IDXDIFF((q)->cidx, (q)->idx, (q)->size)
/**
* ring_tx_db - ring a Tx queue's doorbell
@@ -1354,31 +1327,6 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64
*rsp,
}
/**
- * restore_rx_bufs - put back a packet's Rx buffers
- * @q: the SGE free list
- * @frags: number of FL buffers to restore
- *
- * Puts back on an FL the Rx buffers. The buffers have already been
- * unmapped and are left unmapped, we mark them so to prevent further
- * unmapping attempts.
- *
- * This function undoes a series of @unmap_rx_buf calls when we find out
- * that the current packet can't be processed right away afterall and we
- * need to come back to it later. This is a very rare event and there's
- * no effort to make this particularly efficient.
- */
-static void restore_rx_bufs(struct sge_fl *q, int frags)
-{
- while (frags--) {
- if (q->cidx == 0)
- q->cidx = q->size - 1;
- else
- q->cidx--;
- q->avail++;
- }
-}
-
-/**
* is_new_response - check if a response is newly written
* @r: the response descriptor
* @q: the response queue
@@ -1431,7 +1379,6 @@ static int process_responses(struct sge_rspq *q, int
budget,
int budget_left = budget;
const struct rsp_ctrl *rc;
struct sge_eth_rxq *rxq = container_of(q, struct sge_eth_rxq, rspq);
- struct adapter *adapter = q->adapter;
while (likely(budget_left)) {
rc = (const struct rsp_ctrl *)
@@ -1447,63 +1394,46 @@ static int process_responses(struct sge_rspq *q, int
budget,
rsp_type = G_RSPD_TYPE(rc->u.type_gen);
if (likely(rsp_type == X_RSPD_TYPE_FLBUF)) {
- struct pkt_gl si;
- const struct rx_sw_desc *rsd;
- struct rte_mbuf *pkt = NULL;
- u32 len = ntohl(rc->pldbuflen_qid), bufsz, frags;
+ const struct rx_sw_desc *rsd =
+ &rxq->fl.sdesc[rxq->fl.cidx];
+ const struct rss_header *rss_hdr =
+ (const void *)q->cur_desc;
+ const struct cpl_rx_pkt *cpl =
+ (const void *)&q->cur_desc[1];
+ bool csum_ok = cpl->csum_calc && !cpl->err_vec;
+ struct rte_mbuf *pkt;
+ u32 len = ntohl(rc->pldbuflen_qid);
- si.usembufs = rxq->usembufs;
- /*
- * In "use mbufs" mode, we don't pack multiple
- * ingress packets per buffer (mbuf) so we
- * should _always_ get a "New Buffer" flags
- * from the SGE. Also, since we hand the
- * mbuf's up to the host stack for it to
- * eventually free, we don't release the mbuf's
- * in the driver (in contrast to the "packed
- * page" mode where the driver needs to
- * release its reference on the page buffers).
- */
BUG_ON(!(len & F_RSPD_NEWBUF));
- len = G_RSPD_LEN(len);
- si.tot_len = len;
-
- /* gather packet fragments */
- for (frags = 0; len; frags++) {
- rsd = &rxq->fl.sdesc[rxq->fl.cidx];
- bufsz = min(get_buf_size(adapter, rsd), len);
- pkt = rsd->buf;
- pkt->data_len = bufsz;
- pkt->pkt_len = bufsz;
- si.mbufs[frags] = pkt;
- len -= bufsz;
- unmap_rx_buf(&rxq->fl);
+ pkt = rsd->buf;
+ pkt->data_len = G_RSPD_LEN(len);
+ pkt->pkt_len = pkt->data_len;
+ unmap_rx_buf(&rxq->fl);
+
+ if (cpl->l2info & htonl(F_RXF_IP)) {
+ pkt->ol_flags |= PKT_RX_IPV4_HDR;
+ if (unlikely(!csum_ok))
+ pkt->ol_flags |= PKT_RX_IP_CKSUM_BAD;
+
+ if ((cpl->l2info &
+ htonl(F_RXF_UDP | F_RXF_TCP)) && !csum_ok)
+ pkt->ol_flags |= PKT_RX_L4_CKSUM_BAD;
+ } else if (cpl->l2info & htonl(F_RXF_IP6)) {
+ pkt->ol_flags |= PKT_RX_IPV6_HDR;
}
- si.va = RTE_PTR_ADD(si.mbufs[0]->buf_addr,
- si.mbufs[0]->data_off);
- rte_prefetch1(si.va);
-
- /*
- * For the "use mbuf" case here, we can end up
- * chewing through our Free List very rapidly
- * with one entry per Ingress packet getting
- * consumed. So if the handler() successfully
- * consumed the mbuf, check to see if we can
- * refill the Free List incrementally in the
- * loop ...
- */
- si.nfrags = frags;
- ret = q->handler(q, q->cur_desc, &si);
-
- if (unlikely(ret != 0)) {
- restore_rx_bufs(&rxq->fl, frags);
- } else {
- rx_pkts[budget - budget_left] = pkt;
- if (fl_cap(&rxq->fl) - rxq->fl.avail >= 8)
- __refill_fl(q->adapter, &rxq->fl);
+ if (!rss_hdr->filter_tid && rss_hdr->hash_type) {
+ pkt->ol_flags |= PKT_RX_RSS_HASH;
+ pkt->hash.rss = ntohl(rss_hdr->hash_val);
}
+ if (cpl->vlan_ex) {
+ pkt->ol_flags |= PKT_RX_VLAN_PKT;
+ pkt->vlan_tci = ntohs(cpl->vlan);
+ }
+ rxq->stats.pkts++;
+ rxq->stats.rx_bytes += pkt->pkt_len;
+ rx_pkts[budget - budget_left] = pkt;
} else if (likely(rsp_type == X_RSPD_TYPE_CPL)) {
ret = q->handler(q, q->cur_desc, NULL);
} else {
@@ -1518,6 +1448,34 @@ static int process_responses(struct sge_rspq *q, int
budget,
rspq_next(q);
budget_left--;
+
+ if (R_IDXDIFF(q, gts_idx) >= 64) {
+ unsigned int cidx_inc = R_IDXDIFF(q, gts_idx);
+ unsigned int params;
+ u32 val;
+
+ __refill_fl(q->adapter, &rxq->fl);
+ params = V_QINTR_TIMER_IDX(X_TIMERREG_UPDATE_CIDX);
+ q->next_intr_params = params;
+ val = V_CIDXINC(cidx_inc) | V_SEINTARM(params);
+
+ if (unlikely(!q->bar2_addr))
+ t4_write_reg(q->adapter, MYPF_REG(A_SGE_PF_GTS),
+ val |
+ V_INGRESSQID((u32)q->cntxt_id));
+ else {
+ writel(val | V_INGRESSQID(q->bar2_qid),
+ (void *)((uintptr_t)q->bar2_addr +
+ SGE_UDB_GTS));
+ /*
+ * This Write memory Barrier will force the
+ * write to the User Doorbell area to be
+ * flushed.
+ */
+ wmb();
+ }
+ q->gts_idx = q->cidx;
+ }
}
/*
@@ -1526,7 +1484,7 @@ static int process_responses(struct sge_rspq *q, int
budget,
* refill the Free List.
*/
- if (q->offset >= 0 && fl_cap(&rxq->fl) - rxq->fl.avail >= 8)
+ if (q->offset >= 0 && fl_cap(&rxq->fl) - rxq->fl.avail >= 64)
__refill_fl(q->adapter, &rxq->fl);
return budget - budget_left;
@@ -1535,36 +1493,9 @@ static int process_responses(struct sge_rspq *q, int
budget,
int cxgbe_poll(struct sge_rspq *q, struct rte_mbuf **rx_pkts,
unsigned int budget, unsigned int *work_done)
{
- unsigned int params;
- u32 val;
int err = 0;
*work_done = process_responses(q, budget, rx_pkts);
- params = V_QINTR_TIMER_IDX(X_TIMERREG_UPDATE_CIDX);
- q->next_intr_params = params;
- val = V_CIDXINC(*work_done) | V_SEINTARM(params);
-
- if (*work_done) {
- /*
- * If we don't have access to the new User GTS (T5+),
- * use the old doorbell mechanism; otherwise use the new
- * BAR2 mechanism.
- */
- if (unlikely(!q->bar2_addr))
- t4_write_reg(q->adapter, MYPF_REG(A_SGE_PF_GTS),
- val | V_INGRESSQID((u32)q->cntxt_id));
- else {
- writel(val | V_INGRESSQID(q->bar2_qid),
- (void *)((uintptr_t)q->bar2_addr +
- SGE_UDB_GTS));
- /*
- * This Write memory Barrier will force the write to
- * the User Doorbell area to be flushed.
- */
- wmb();
- }
- }
-
return err;
}
@@ -1717,7 +1648,7 @@ int t4_sge_alloc_rxq(struct adapter *adap, struct
sge_rspq *iq, bool fwevtq,
* Hence maximum allowed burst size will be 448 bytes.
*/
c.fl0dcaen_to_fl0cidxfthresh =
- htons(V_FW_IQ_CMD_FL0FBMIN(X_FETCHBURSTMIN_64B) |
+ htons(V_FW_IQ_CMD_FL0FBMIN(X_FETCHBURSTMIN_128B) |
V_FW_IQ_CMD_FL0FBMAX((chip <= CHELSIO_T5) ?
X_FETCHBURSTMAX_512B : X_FETCHBURSTMAX_256B));
c.fl0size = htons(flsz);
@@ -1730,6 +1661,7 @@ int t4_sge_alloc_rxq(struct adapter *adap, struct
sge_rspq *iq, bool fwevtq,
iq->cur_desc = iq->desc;
iq->cidx = 0;
+ iq->gts_idx = 0;
iq->gen = 1;
iq->next_intr_params = iq->intr_params;
iq->cntxt_id = ntohs(c.iqid);
@@ -1739,6 +1671,7 @@ int t4_sge_alloc_rxq(struct adapter *adap, struct
sge_rspq *iq, bool fwevtq,
iq->size--; /* subtract status entry */
iq->eth_dev = eth_dev;
iq->handler = hnd;
+ iq->port_id = pi->port_id;
iq->mb_pool = mp;
/* set offset to -1 to distinguish ingress queues without FL */
--
2.4.1
